feat: integrate Monolog for enhanced logging across providers and controller

Covers testing file conventions, Red→Green→Refactor cycle with
example prompts, common anti-patterns, test runner commands, and
the auto-run hook setup.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.claude/settings.json

@@ -0,0 +1,10 @@
+{
+    "hooks": {
+        "PostToolUse": [
+            {
+                "matcher": "Edit|Write",
+                "command": "php bin/phpunit 2>&1 | tail -20"
+            }
+        ]
+    }
+}

.dockerignore

@@ -0,0 +1,6 @@
+.git
+.gitea
+var/
+.env.local
+.env.*.local
+docker-compose.override.yml

.gitea/workflows/docker-publish.yml

@@ -0,0 +1,70 @@
+# Builds and pushes a multi-arch Docker image to the Gitea container registry
+# whenever a semver tag (v*.*.*) is pushed.
+#
+# One-time setup required:
+#   1. Create a Gitea token with "package:write" scope.
+#   2. Add it as a repository secret named GITEA_TOKEN
+#      (Repository → Settings → Secrets → Actions).
+#
+# After a successful run the image is available at:
+#   <your-gitea-host>/<owner>/<repo>:<version>
+
+name: Docker Publish
+
+on:
+  push:
+    tags:
+      - 'v*.*.*'
+
+jobs:
+  build-push:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      # Strip the protocol from the server URL to get the registry hostname.
+      # e.g. https://gitea.example.com → gitea.example.com
+      - name: Derive registry hostname
+        run: |
+          echo "REGISTRY=$(echo '${{ gitea.server_url }}' | sed 's|https://||;s|http://||')" >> $GITHUB_ENV
+
+      # Generates OCI-compliant tags and labels from the git tag.
+      # v1.2.3 → image tags: 1.2.3 / 1.2 / 1
+      - name: Extract Docker metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ gitea.repository }}
+          tags: |
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+
+      # QEMU enables emulation of arm64 on the amd64 runner.
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      # BuildKit driver required for multi-platform builds and layer caching.
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to Gitea registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ gitea.actor }}
+          password: ${{ secrets.GITEA_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          # Registry-based layer cache — survives between runs without a separate cache store.
+          cache-from: type=registry,ref=${{ env.REGISTRY }}/${{ gitea.repository }}:buildcache
+          cache-to: type=registry,ref=${{ env.REGISTRY }}/${{ gitea.repository }}:buildcache,mode=max

.gitignore

@@ -4,3 +4,4 @@
 /var/
 /public/bundles/
 composer.lock
+/.phpunit.cache

CLAUDE.md

@@ -16,22 +16,152 @@ curl "http://localhost:8080/graph.svg?theme=dark" -o graph.svg
 curl "http://localhost:8080/health"
 ```
 
-## Docker
+### Testing conventions (apply to every test file)
+
+- `declare(strict_types=1)` at the top of every test file
+- Test classes are `final` and extend `TestCase`
+- Methods: `#[Test]` attribute + `it_` prefix + `snake_case` — e.g. `it_returns_empty_when_no_contributions`
+- Structure: Arrange → Act → Assert, separated by blank lines; one assertion per test when possible
+- Use `$this->assert*()` not `self::assert*()`
+
+```php
+<?php
+
+declare(strict_types=1);
+
+namespace App\Tests\Service;
+
+use App\Service\SvgRenderer;
+use PHPUnit\Framework\Attributes\Test;
+use PHPUnit\Framework\TestCase;
+
+final class SvgRendererTest extends TestCase
+{
+    #[Test]
+    public function it_renders_an_svg_with_no_contributions(): void
+    {
+        $renderer = new SvgRenderer();
+
+        $svg = $renderer->render([], 'light');
+
+        $this->assertStringContainsString('<svg', $svg);
+    }
+}
+```
+
+### TDD: Red → Green → Refactor
+
+Always drive new features and bug fixes with this cycle. Claude writes implementation first by default — override that with explicit prompts.
+
+**Phase 1 — Red (write a failing test first)**
+
+```
+Write a failing test for [feature description].
+Do NOT write the implementation yet.
+The test should fail because the class/method does not exist.
+```
+
+**Phase 2 — Green (minimal implementation)**
+
+```
+The tests are written and failing. Now implement the minimum code to make them pass. Nothing more.
+```
+
+**Phase 3 — Refactor**
+
+```
+Tests are green. Refactor the implementation for [readability / removing duplication / naming].
+Run vendor/bin/phpunit after each change to confirm tests stay green.
+```
+
+**Common anti-patterns**
+
+| Wrong prompt | Why it breaks TDD | Correct prompt |
+|---|---|---|
+| "Write tests for this feature" | Claude implements first, then fits tests to it | "Write **failing** tests for [feature]. Stop before any implementation." |
+| "Add tests and implementation" | Loses the design feedback of failing tests | Two separate prompts: Red, then Green |
+| "Make the tests pass" | Encourages skipping to a green state | "Implement the minimum to make the failing tests pass." |
+| Combining Red + Green in one request | No failing baseline | Always separate the two phases |
+
+### Running tests
+Prever to use the tests in `docker compose exec graph`
 
 ```bash
-# Build and run
+# Run full suite
+vendor/bin/phpunit
+
+# Run with human-readable output
+vendor/bin/phpunit --testdox
+
+# Run a single test file
+vendor/bin/phpunit tests/Unit/Service/SvgRendererTest.php
+
+# Run tests matching a filter
+vendor/bin/phpunit --filter it_renders
+```
+
+### Auto-run hook
+
+Add to `.claude/settings.json` to run PHPUnit automatically after every file edit:
+
+```json
+{
+  "hooks": {
+    "PostToolUse": [
+      {
+        "matcher": "Edit|Write",
+        "command": "vendor/bin/phpunit 2>&1 | tail -20"
+      }
+    ]
+  }
+}
+```
+
+## Docker
+
+### Development
+
+`docker-compose.override.yml` is picked up automatically and targets the `dev` stage (Xdebug + all deps, source mounted).
+
+```bash
+# Start dev container (override applied automatically)
 docker compose up -d --build
 
-# Force cache clear (clears the 1h filesystem cache)
+# Shell into the container to run commands
+docker compose exec graph sh
+
+# Run tests inside the container
+docker compose exec graph vendor/bin/phpunit
+
+# Disable Xdebug for faster test runs
+XDEBUG_MODE=off docker compose up -d
+
+# Force cache clear
 docker compose exec graph rm -rf var/cache/*
 
 # View logs
 docker compose logs -f graph
 ```
 
-There is no `composer.lock` in the repo. If you add or change dependencies, run `composer install` locally and commit the resulting lock file — without it, Docker builds resolve versions fresh each time and may produce inconsistent results.
+**Xdebug:** listens on port `9003`. Configure your IDE to accept connections from Docker. On Linux `host.docker.internal` is resolved via `extra_hosts: host-gateway` in the override file.
 
-The Dockerfile runs `composer install --no-scripts` (skipping Symfony post-install scripts) then `composer dump-autoload --optimize --no-dev` in the final stage. If `bin/console` fails with a missing class error inside the container, the most likely cause is the absent lock file causing an incomplete dependency resolution.
+### Production
+
+Use only the base compose file to skip the dev override:
+
+```bash
+docker compose -f docker-compose.yml up -d --build
+```
+
+The `final` stage runs as a non-root `app` user and contains no Composer binary. The build pipeline is:
+
+```
+base → deps (composer install --no-dev)
+     → build (copy source + dump-autoload)
+     → final (copy vendor + source, chown app, USER app)
+```
+
+There is no `composer.lock` in the repo. If you add or change dependencies, run `composer install` locally and commit the resulting lock file — without it, Docker builds resolve versions fresh each time and may produce inconsistent results.
 
 ## Architecture
 

Dockerfile

@@ -1,19 +1,16 @@
 FROM php:8.3-cli-alpine AS base
 
-# Runtime dependencies
 RUN apk add --no-cache \
     curl \
     icu-libs \
     libzip \
     && docker-php-ext-install opcache
 
-# Composer
-COPY --from=composer:2 /usr/bin/composer /usr/bin/composer
-
 WORKDIR /app
 
-# ── deps stage ────────────────────────────────────────────────────────────────
+# ── deps stage (prod vendor) ───────────────────────────────────────────────────
 FROM base AS deps
+COPY --from=composer:2 /usr/bin/composer /usr/bin/composer
 COPY composer.json composer.lock* ./
 RUN composer install \
         --no-dev \
@@ -22,20 +19,39 @@ RUN composer install \
         --optimize-autoloader \
         --prefer-dist
 
-# ── final stage ───────────────────────────────────────────────────────────────
+# ── build stage (generate optimised classmap with source present) ──────────────
+FROM deps AS build
+COPY . .
+RUN composer dump-autoload --optimize --no-dev --no-interaction
+
+# ── dev stage (all deps + Xdebug, source is mounted at runtime) ───────────────
+FROM base AS dev
+COPY --from=composer:2 /usr/bin/composer /usr/bin/composer
+RUN apk add --no-cache ${PHPIZE_DEPS} linux-headers \
+    && pecl install xdebug \
+    && docker-php-ext-enable xdebug \
+    && apk del ${PHPIZE_DEPS}
+COPY docker/php/xdebug.ini /usr/local/etc/php/conf.d/docker-xdebug.ini
+COPY composer.json composer.lock* ./
+RUN composer install --no-scripts --no-interaction --prefer-dist
+EXPOSE 8080
+ENV APP_ENV=dev APP_DEBUG=1
+CMD ["php", "-S", "0.0.0.0:8080", "-t", "public", "public/index.php"]
+
+# ── final (prod) stage — no composer binary ────────────────────────────────────
 FROM base AS final
 
-COPY --from=deps /app/vendor /app/vendor
+RUN addgroup -S app && adduser -S -G app app
+
+COPY --from=build /app/vendor /app/vendor
 COPY . .
 
 RUN mkdir -p var/cache var/log \
-    && chmod -R 777 var \
+    && chown -R app:app /app
-    && composer dump-autoload --optimize --no-dev
+
+USER app
 
 EXPOSE 8080
+ENV APP_ENV=prod APP_DEBUG=0
 
-ENV APP_ENV=prod \
-    APP_DEBUG=0
-
-# Symfony's built-in dev server via PHP — fine for a single-purpose container
 CMD ["php", "-S", "0.0.0.0:8080", "-t", "public", "public/index.php"]

README.md

@@ -104,11 +104,14 @@ All credentials are configured via environment variables — see [Deploy](#deplo
 
 ### GitHub
 
+**Fine-grained token (recommended):**
 1. Go to **Settings → Developer settings → Personal access tokens → Fine-grained tokens**
 2. Set **Resource owner** to your account
 3. Under **Permissions → Account permissions**, set **Contribution activity** → Read-only
 4. Generate and copy the token
 
+**Classic token:** create a token with the `read:user` scope.
+
 ### GitLab
 
 1. Go to **User Settings → Access Tokens**
@@ -125,6 +128,8 @@ All credentials are configured via environment variables — see [Deploy](#deplo
 
 ## Development
 
+### Local (PHP)
+
 ```bash
 # Install deps
 composer install
@@ -136,24 +141,76 @@ APP_ENV=dev php -S localhost:8080 -t public
 curl "http://localhost:8080/graph.svg" -o graph.svg
 ```
 
+### Docker (recommended)
+
+`docker-compose.override.yml` is picked up automatically and targets the `dev` stage (Xdebug enabled, source mounted).
+
+```bash
+# Start dev container
+docker compose up -d --build
+
+# Shell into the container
+docker compose exec graph sh
+
+# Run tests inside the container
+docker compose exec graph php bin/phpunit
+
+# Disable Xdebug for faster test runs
+XDEBUG_MODE=off docker compose up -d
+```
+
+Xdebug listens on port **9003**. On Linux, `host.docker.internal` is resolved via `host-gateway`.
+
+To run with production config only (no override):
+
+```bash
+docker compose -f docker-compose.yml up -d --build
+```
+
+---
+
+## Testing
+
+```bash
+# Run full suite
+php bin/phpunit
+
+# Human-readable output
+php bin/phpunit --testdox
+
+# Single file
+php bin/phpunit tests/Unit/Service/SvgRendererTest.php
+
+# Filter by name
+php bin/phpunit --filter it_renders
+```
+
 ---
 
 ## Architecture
 
 ```
-GET /graph.svg
+GET /graph.svg?theme=dark|light
-      │
+  └─ GraphController
-      ├─ GitHubProvider  →  GitHub GraphQL API (contributionCalendar)
+       ├─ host check (ALLOWED_HOSTS env, optional)
-      ├─ GitLabProvider  →  GitLab REST API    (/users/:id/events)
+       ├─ cache lookup (filesystem, 1h TTL, key = "graph_{theme}")
-      └─ GiteaProvider   →  Gitea REST API     (/users/:user/heatmap)
+       │    └─ on miss:
-                │
+       │         ├─ GitHubProvider  → GitHub GraphQL API (contributionCalendar)
-          merge by date (sum counts)
+       │         ├─ GitLabProvider  → GitLab REST API    (/users/:id/events, paginated)
-                │
+       │         └─ GiteaProvider   → Gitea REST API     (/users/:user/heatmap)
-          SvgRenderer
+       │              each returns array<string, int>  (Y-m-d => count)
-                │
+       │              failures are caught and logged; remaining providers still render
-          image/svg+xml  (cached 1h)
+       │         └─ merge by date (sum counts across providers)
+       │         └─ SvgRenderer::render()
+       └─ Response: image/svg+xml, Cache-Control: public max-age=3600
 ```
 
+**Provider activation:** a provider only runs when its env vars are non-empty. GitHub and GitLab require `_USER` + `_TOKEN`; Gitea additionally requires `_URL`. GitLab resolves a numeric user ID from the username via a `/api/v4/users?username=` lookup before fetching events.
+
+**SvgRenderer:** builds a 53-column × 7-row grid aligned so the last column always ends on the Saturday of the current week. Five intensity levels (0 → level 0, 1–3 → 1, 4–6 → 2, 7–9 → 3, 10+ → 4) mapped to GitHub's colour tokens. No external assets — the SVG is fully self-contained.
+
+**Cache:** filesystem adapter (`var/cache/`), mounted as a Docker volume to survive container restarts. Theme is part of the cache key so dark and light are cached independently.
+
 ---
 
 ## License

composer.json

@@ -5,10 +5,16 @@
     "license": "MIT",
     "require": {
         "php": ">=8.2",
-        "symfony/cache": "^7.1",
+        "eightpoints/guzzle-bundle": "^8.6",
-        "symfony/framework-bundle": "^7.1",
+        "idci/graphql-client-bundle": "^2.0",
-        "symfony/http-client": "^7.1",
+        "monolog/monolog": "^3.10",
-        "symfony/runtime": "^7.1"
+        "symfony/cache": "7.4.*",
+        "symfony/console": "7.4.*",
+        "symfony/framework-bundle": "7.4.*",
+        "symfony/http-client": "7.4.*",
+        "symfony/monolog-bundle": "^4.0",
+        "symfony/runtime": "7.4.*",
+        "symfony/yaml": "7.4.*"
     },
     "autoload": {
         "psr-4": {
@@ -20,6 +26,10 @@
             "App\\Tests\\": "tests/"
         }
     },
+    "require-dev": {
+        "phpunit/phpunit": "^11.5",
+        "symfony/phpunit-bridge": "^7.4"
+    },
     "config": {
         "optimize-autoloader": true,
         "sort-packages": true,
@@ -30,7 +40,7 @@
     "extra": {
         "symfony": {
             "allow-contrib": false,
-            "require": "7.1.*"
+            "require": "7.4.*"
         }
     }
 }

config/bundles.php

@@ -2,4 +2,7 @@
 
 return [
     Symfony\Bundle\FrameworkBundle\FrameworkBundle::class => ['all' => true],
+    Symfony\Bundle\MonologBundle\MonologBundle::class => ['all' => true],
+    EightPoints\Bundle\GuzzleBundle\EightPointsGuzzleBundle::class => ['all' => true],
+    IDCI\Bundle\GraphQLClientBundle\IDCIGraphQLClientBundle::class => ['all' => true],
 ];

config/packages/eight_points_guzzle.yaml

@@ -0,0 +1,7 @@
+eight_points_guzzle:
+    clients:
+        github_graphql:
+            base_url: 'https://api.github.com/graphql'
+            options:
+                headers:
+                    Authorization: 'Bearer %env(GITHUB_TOKEN)%'

config/packages/idci_graphql_client.yaml

@@ -0,0 +1,4 @@
+idci_graphql_client:
+    clients:
+        github:
+            http_client: 'eight_points_guzzle.client.github_graphql'

config/packages/monolog.yaml

@@ -0,0 +1,26 @@
+monolog:
+    channels:
+        - deprecation
+
+when@dev:
+    monolog:
+        handlers:
+            main:
+                type: stream
+                path: '%kernel.logs_dir%/%kernel.environment%.log'
+                level: debug
+                channels: ['!event']
+
+when@prod:
+    monolog:
+        handlers:
+            main:
+                type: stream
+                path: php://stderr
+                level: warning
+                channels: ['!event']
+            deprecation:
+                type: stream
+                channels: [deprecation]
+                path: '%kernel.logs_dir%/%kernel.environment%.deprecations.log'
+                level: info

config/services.yaml

@@ -0,0 +1,31 @@
+services:
+    _defaults:
+        autowire: true
+        autoconfigure: true
+        public: false
+
+    App\:
+        resource: '../src/'
+        exclude:
+            - '../src/Kernel.php'
+
+    _instanceof:
+        App\Service\ProviderInterface:
+            tags: ['app.provider']
+
+    App\Service\GitHubProvider:
+        arguments:
+            $username: '%env(GITHUB_USER)%'
+            $token: '%env(GITHUB_TOKEN)%'
+
+    App\Service\GitLabProvider:
+        arguments:
+            $username: '%env(GITLAB_USER)%'
+            $token: '%env(GITLAB_TOKEN)%'
+            $baseUrl: '%env(GITLAB_URL)%'
+
+    App\Service\GiteaProvider:
+        arguments:
+            $username: '%env(GITEA_USER)%'
+            $token: '%env(GITEA_TOKEN)%'
+            $baseUrl: '%env(GITEA_URL)%'

docker-compose.override.yml

@@ -0,0 +1,19 @@
+# Local development overrides — picked up automatically by `docker compose up`.
+# To run with production config only: docker compose -f docker-compose.yml up
+services:
+  graph:
+    build:
+      target: dev
+    volumes:
+      - .:/app
+      - /app/vendor        # keeps vendor from the dev image, not your local dir
+    environment:
+      APP_ENV: dev
+      APP_DEBUG: "1"
+      XDEBUG_MODE: "${XDEBUG_MODE:-debug}"
+      XDEBUG_CONFIG: "client_host=host.docker.internal"
+    # Makes host.docker.internal resolve correctly on Linux
+    extra_hosts:
+      - "host.docker.internal:host-gateway"
+    ports:
+      - "9003:9003"

docker-compose.yml

@@ -1,6 +1,8 @@
 services:
   graph:
-    build: .
+    build:
+      context: .
+      target: final
     container_name: git-contribution-graph
     restart: unless-stopped
     ports:

docker/php/xdebug.ini

@@ -0,0 +1,8 @@
+[xdebug]
+; Mode is controlled by the XDEBUG_MODE env var in docker-compose.override.yml.
+; Set XDEBUG_MODE=off in your shell to skip Xdebug for faster test runs.
+xdebug.mode=off
+xdebug.client_port=9003
+xdebug.client_host=host.docker.internal
+xdebug.start_with_request=yes
+xdebug.log=/tmp/xdebug.log

phpunit.xml.dist

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/11.5/phpunit.xsd"
+         bootstrap="vendor/autoload.php"
+         colors="true"
+         cacheDirectory=".phpunit.cache"
+>
+    <testsuites>
+        <testsuite name="unit">
+            <directory>tests/Unit</directory>
+        </testsuite>
+    </testsuites>
+
+    <source>
+        <include>
+            <directory suffix=".php">src</directory>
+        </include>
+    </source>
+</phpunit>

public/robots.txt

@@ -0,0 +1,2 @@
+User-agent: *
+Disallow: /

src/Controller/GraphController.php

@@ -2,12 +2,12 @@
 
 namespace App\Controller;
 
-use App\Service\GiteaProvider;
+use App\Service\ProviderInterface;
-use App\Service\GitHubProvider;
-use App\Service\GitLabProvider;
 use App\Service\SvgRenderer;
 use Psr\Log\LoggerInterface;
 use Symfony\Component\DependencyInjection\Attribute\Autowire;
+use Symfony\Component\DependencyInjection\Attribute\TaggedIterator;
+use Symfony\Component\HttpFoundation\RedirectResponse;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\Routing\Attribute\Route;
@@ -20,30 +20,13 @@ class GraphController
     private readonly array $allowedHosts;
 
     public function __construct(
-        private readonly GitHubProvider $github,
+        #[TaggedIterator('app.provider')]
-        private readonly GitLabProvider $gitlab,
+        private readonly iterable $providers,
-        private readonly GiteaProvider $gitea,
         private readonly SvgRenderer $renderer,
         private readonly CacheInterface $cache,
         private readonly LoggerInterface $logger,
         #[Autowire(env: 'ALLOWED_HOSTS')]
         string $allowedHosts = '',
-        #[Autowire(env: 'GITHUB_USER')]
-        private readonly string $githubUser = '',
-        #[Autowire(env: 'GITHUB_TOKEN')]
-        private readonly string $githubToken = '',
-        #[Autowire(env: 'GITLAB_USER')]
-        private readonly string $gitlabUser = '',
-        #[Autowire(env: 'GITLAB_TOKEN')]
-        private readonly string $gitlabToken = '',
-        #[Autowire(env: 'GITLAB_URL')]
-        private readonly string $gitlabUrl = '',
-        #[Autowire(env: 'GITEA_USER')]
-        private readonly string $giteaUser = '',
-        #[Autowire(env: 'GITEA_TOKEN')]
-        private readonly string $giteaToken = '',
-        #[Autowire(env: 'GITEA_URL')]
-        private readonly string $giteaUrl = '',
     ) {
         $this->allowedHosts = array_values(array_filter(array_map('trim', explode(',', $allowedHosts))));
     }
@@ -56,78 +39,73 @@ class GraphController
     public function graph(Request $request): Response
     {
         if ($this->allowedHosts !== [] && !in_array($request->getHost(), $this->allowedHosts, true)) {
+            $this->logger->warning('GraphController: rejected request from disallowed host', ['host' => $request->getHost()]);
+
             return new Response('Forbidden', 403);
         }
 
         $theme    = $request->query->get('theme', 'dark');
-
         $cacheKey = 'graph_' . $theme;
 
-        $svg = $this->cache->get($cacheKey, function (ItemInterface $item) use ($theme): string {
+        $cacheMiss = false;
+        $svg = $this->cache->get($cacheKey, function (ItemInterface $item) use ($theme, &$cacheMiss): string {
+            $cacheMiss = true;
             $item->expiresAfter(3600);
 
-            $contributions = $this->fetchAllContributions();
+            return $this->renderer->render($this->fetchAllContributions(), $theme);
-
-            return $this->renderer->render($contributions, $theme);
         });
 
+        $this->logger->debug('GraphController: cache ' . ($cacheMiss ? 'miss' : 'hit'), ['theme' => $theme]);
+
         return new Response($svg, 200, [
             'Content-Type'  => 'image/svg+xml',
             'Cache-Control' => 'public, max-age=3600',
         ]);
     }
 
+    #[Route('/', name: 'index', methods: ['GET'])]
+    public function index(Request $request): RedirectResponse
+    {
+        $query = $request->query->all();
+        $url   = '/graph.svg' . ($query ? '?' . http_build_query($query) : '');
+
+        return new RedirectResponse($url, 302);
+    }
+
     #[Route('/health', name: 'health', methods: ['GET'])]
     public function health(): Response
     {
         return new Response('{"status":"ok"}', 200, ['Content-Type' => 'application/json']);
     }
 
+    /** @return array<string, int> */
     private function fetchAllContributions(): array
     {
         $contributions = [];
 
-        if ($this->githubUser !== '' && $this->githubToken !== '') {
+        /** @var ProviderInterface $provider */
-            try {
+        foreach ($this->providers as $provider) {
-                $contributions = $this->merge($contributions, $this->github->fetch($this->githubUser, $this->githubToken));
+            if (!$provider->isConfigured()) {
-            } catch (\Throwable $e) {
+                continue;
-                $this->logger->warning('GitHub fetch failed: ' . $e->getMessage());
-            }
             }
 
-        if ($this->gitlabUser !== '' && $this->gitlabToken !== '') {
             try {
-                $contributions = $this->merge($contributions, $this->gitlab->fetch(
+                $contributions = $this->merge($contributions, $provider->fetch());
-                    $this->gitlabUser,
-                    $this->gitlabToken,
-                    $this->gitlabUrl !== '' ? $this->gitlabUrl : 'https://gitlab.com'
-                ));
             } catch (\Throwable $e) {
-                $this->logger->warning('GitLab fetch failed: ' . $e->getMessage());
+                $this->logger->warning(sprintf('%s fetch failed: %s', $provider::class, $e->getMessage()), ['exception' => $e]);
-            }
-        }
-
-        if ($this->giteaUser !== '' && $this->giteaToken !== '' && $this->giteaUrl !== '') {
-            try {
-                $contributions = $this->merge($contributions, $this->gitea->fetch(
-                    $this->giteaUser,
-                    $this->giteaToken,
-                    rtrim($this->giteaUrl, '/')
-                ));
-            } catch (\Throwable $e) {
-                $this->logger->warning('Gitea fetch failed: ' . $e->getMessage());
             }
         }
 
         return $contributions;
     }
 
-    /** Sum contributions by date from two maps. */
+    /** @param array<string, int> $base @param array<string, int> $new @return array<string, int> */
     private function merge(array $base, array $new): array
     {
         foreach ($new as $date => $count) {
             $base[$date] = ($base[$date] ?? 0) + $count;
         }
+
         return $base;
     }
 }

src/Service/GitHubProvider.php

@@ -2,6 +2,9 @@
 
 namespace App\Service;
 
+use IDCI\Bundle\GraphQLClientBundle\Client\GraphQLApiClient;
+use IDCI\Bundle\GraphQLClientBundle\Client\GraphQLApiClientRegistryInterface;
+use Psr\Log\LoggerInterface;
 use Symfony\Contracts\HttpClient\HttpClientInterface;
 
 /**
@@ -9,46 +12,58 @@ use Symfony\Contracts\HttpClient\HttpClientInterface;
  *
  * Required token scopes: read:user
  */
-class GitHubProvider
+class GitHubProvider implements ProviderInterface
 {
     private const GRAPHQL_URL = 'https://api.github.com/graphql';
 
-    private const QUERY = <<<'GRAPHQL'
+    public function __construct(
-    query($username: String!, $from: DateTime!, $to: DateTime!) {
+        private readonly HttpClientInterface $client,
-      user(login: $username) {
+        private readonly GraphQLApiClientRegistryInterface $registry,
-        contributionsCollection(from: $from, to: $to) {
+        private readonly string $username,
-          contributionCalendar {
+        private readonly string $token,
-            weeks {
+        private readonly LoggerInterface $logger,
-              contributionDays {
+    ) {}
-                date
-                contributionCount
-              }
-            }
-          }
-        }
-      }
-    }
-    GRAPHQL;
 
-    public function __construct(private readonly HttpClientInterface $client) {}
+    public function isConfigured(): bool
+    {
+        return $this->username !== '' && $this->token !== '';
+    }
 
     /**
      * @return array<string, int>  date (Y-m-d) => contribution count
      */
-    public function fetch(string $username, string $token): array
+    public function fetch(): array
     {
+        $this->logger->debug('GitHubProvider: fetching contributions', ['user' => $this->username]);
+
         $from = (new \DateTimeImmutable('-365 days'))->format('Y-m-d\T00:00:00\Z');
         $to   = (new \DateTimeImmutable())->format('Y-m-d\T23:59:59\Z');
 
+        /** @var GraphQLApiClient $graphqlClient */
+        $graphqlClient = $this->registry->get('github');
+
+        $query = $graphqlClient->buildQuery(
+            ['user' => ['login' => $this->username]],
+            [
+                'contributionsCollection' => [
+                    '_parameters' => ['from' => $from, 'to' => $to],
+                    'contributionCalendar' => [
+                        'weeks' => [
+                            'contributionDays' => ['date', 'contributionCount'],
+                        ],
+                    ],
+                ],
+            ]
+        )->getGraphQLQuery();
+
+        // GitHub's GraphQL API requires application/json — the bundle's built-in
+        // transport sends form_params, so we use Symfony HttpClient here instead.
         $response = $this->client->request('POST', self::GRAPHQL_URL, [
             'headers' => [
-                'Authorization' => "Bearer $token",
+                'Authorization' => "Bearer {$this->token}",
                 'Content-Type'  => 'application/json',
             ],
-            'json' => [
+            'json' => ['query' => $query],
-                'query'     => self::QUERY,
-                'variables' => ['username' => $username, 'from' => $from, 'to' => $to],
-            ],
         ]);
 
         $data = $response->toArray();
@@ -68,6 +83,12 @@ class GitHubProvider
             }
         }
 
+        $this->logger->info('GitHubProvider: fetched contributions', [
+            'user'  => $this->username,
+            'days'  => count($result),
+            'total' => array_sum($result),
+        ]);
+
         return $result;
     }
 }

src/Service/GitLabProvider.php

@@ -2,6 +2,7 @@
 
 namespace App\Service;
 
+use Psr\Log\LoggerInterface;
 use Symfony\Contracts\HttpClient\HttpClientInterface;
 
 /**
@@ -10,26 +11,39 @@ use Symfony\Contracts\HttpClient\HttpClientInterface;
  * Required token scopes: read_user, read_api
  * Works with both gitlab.com and self-hosted instances.
  */
-class GitLabProvider
+class GitLabProvider implements ProviderInterface
 {
-    public function __construct(private readonly HttpClientInterface $client) {}
+    public function __construct(
+        private readonly HttpClientInterface $client,
+        private readonly string $username,
+        private readonly string $token,
+        private readonly LoggerInterface $logger,
+        private readonly string $baseUrl = '',
+    ) {}
+
+    public function isConfigured(): bool
+    {
+        return $this->username !== '' && $this->token !== '';
+    }
 
     /**
      * @return array<string, int>  date (Y-m-d) => event count
      */
-    public function fetch(string $username, string $token, string $baseUrl = 'https://gitlab.com'): array
+    public function fetch(): array
     {
-        $baseUrl = rtrim($baseUrl, '/');
+        $baseUrl = rtrim($this->baseUrl !== '' ? $this->baseUrl : 'https://gitlab.com', '/');
+
+        $this->logger->debug('GitLabProvider: fetching contributions', ['user' => $this->username, 'url' => $baseUrl]);
 
         // Resolve numeric user ID from username
         $userResponse = $this->client->request('GET', "$baseUrl/api/v4/users", [
-            'headers' => ['PRIVATE-TOKEN' => $token],
+            'headers' => ['PRIVATE-TOKEN' => $this->token],
-            'query'   => ['username' => $username],
+            'query'   => ['username' => $this->username],
         ]);
 
         $users = $userResponse->toArray();
         if (empty($users)) {
-            throw new \RuntimeException("GitLab: user '$username' not found on $baseUrl");
+            throw new \RuntimeException("GitLab: user '{$this->username}' not found on $baseUrl");
         }
         $userId = $users[0]['id'];
 
@@ -39,7 +53,7 @@ class GitLabProvider
 
         do {
             $response = $this->client->request('GET', "$baseUrl/api/v4/users/$userId/events", [
-                'headers' => ['PRIVATE-TOKEN' => $token],
+                'headers' => ['PRIVATE-TOKEN' => $this->token],
                 'query'   => [
                     'after'    => $after,
                     'per_page' => 100,
@@ -57,6 +71,13 @@ class GitLabProvider
             $page++;
         } while (count($events) === 100);
 
+        $this->logger->info('GitLabProvider: fetched contributions', [
+            'user'  => $this->username,
+            'pages' => $page - 1,
+            'days'  => count($result),
+            'total' => array_sum($result),
+        ]);
+
         return $result;
     }
 }

src/Service/GiteaProvider.php

@@ -2,6 +2,7 @@
 
 namespace App\Service;
 
+use Psr\Log\LoggerInterface;
 use Symfony\Contracts\HttpClient\HttpClientInterface;
 
 /**
@@ -12,18 +13,32 @@ use Symfony\Contracts\HttpClient\HttpClientInterface;
  *
  * Required token scopes: read:user
  */
-class GiteaProvider
+class GiteaProvider implements ProviderInterface
 {
-    public function __construct(private readonly HttpClientInterface $client) {}
+    public function __construct(
+        private readonly HttpClientInterface $client,
+        private readonly string $username,
+        private readonly string $token,
+        private readonly string $baseUrl,
+        private readonly LoggerInterface $logger,
+    ) {}
+
+    public function isConfigured(): bool
+    {
+        return $this->username !== '' && $this->token !== '' && $this->baseUrl !== '';
+    }
 
     /**
      * @return array<string, int>  date (Y-m-d) => contribution count
      */
-    public function fetch(string $username, string $token, string $baseUrl): array
+    public function fetch(): array
     {
-        $baseUrl  = rtrim($baseUrl, '/');
+        $baseUrl  = rtrim($this->baseUrl, '/');
-        $response = $this->client->request('GET', "$baseUrl/api/v1/users/$username/heatmap", [
+
-            'headers' => ['Authorization' => "token $token"],
+        $this->logger->debug('GiteaProvider: fetching contributions', ['user' => $this->username, 'url' => $baseUrl]);
+
+        $response = $this->client->request('GET', "$baseUrl/api/v1/users/{$this->username}/heatmap", [
+            'headers' => ['Authorization' => "token {$this->token}"],
         ]);
 
         $data   = $response->toArray();
@@ -38,6 +53,12 @@ class GiteaProvider
             $result[$date] = ($result[$date] ?? 0) + (int) $entry['contributions'];
         }
 
+        $this->logger->info('GiteaProvider: fetched contributions', [
+            'user'  => $this->username,
+            'days'  => count($result),
+            'total' => array_sum($result),
+        ]);
+
         return $result;
     }
 }

src/Service/ProviderInterface.php

@@ -0,0 +1,13 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Service;
+
+interface ProviderInterface
+{
+    /** @return array<string, int>  date (Y-m-d) => contribution count */
+    public function fetch(): array;
+
+    public function isConfigured(): bool;
+}

src/Service/SvgRenderer.php

@@ -28,8 +28,7 @@ class SvgRenderer
     ];
 
     private const CELL      = 10;   // px
-    private const GAP       = 3;    // px
+    private const STEP      = 13;   // CELL + 3px gap
-    private const STEP      = 13;   // CELL + GAP
     private const WEEKS     = 53;
     private const MARGIN_X  = 28;   // left margin for day labels
     private const MARGIN_Y  = 20;   // top margin for month labels
@@ -42,7 +41,7 @@ class SvgRenderer
         $today   = new \DateTimeImmutable('today');
         // align grid: last column always ends on the Saturday of the current week
         $endSat  = $today->modify('Saturday this week');
-        $start   = $endSat->modify('-' . (self::WEEKS - 1) . ' weeks')->modify('Sunday');
+        $start   = $endSat->modify('-' . (self::WEEKS - 1) . ' weeks')->modify('last Sunday');
 
         $grid  = $this->buildGrid($start, $today, $contributions);
         $stats = $this->computeStats($contributions);
@@ -69,7 +68,7 @@ class SvgRenderer
         $out .= $this->renderCells($grid, $colors);
 
         // Legend row (Less → More)
-        $out .= $this->renderLegend($totalW, $totalH, $colors);
+        $out .= $this->renderLegend($totalH, $colors);
 
         // Total count
         $out .= sprintf(
@@ -197,8 +196,9 @@ class SvgRenderer
                 $color = $colors['levels'][$this->level($cell['count'])];
 
                 $ts     = strtotime($cell['date']);
+                $suffix = $cell['count'] !== 1 ? 's' : '';
                 $label  = $cell['count'] > 0
-                    ? $cell['count'] . ' contribution' . ($cell['count'] !== 1 ? 's' : '') . ' on ' . date('F j, Y', $ts)
+                    ? $cell['count'] . ' contribution' . $suffix . ' on ' . date('F j, Y', $ts)
                     : 'No contributions on ' . date('F j, Y', $ts);
 
                 $out .= sprintf(
@@ -216,7 +216,7 @@ class SvgRenderer
         return $out;
     }
 
-    private function renderLegend(int $totalW, int $totalH, array $colors): string
+    private function renderLegend(int $totalH, array $colors): string
     {
         $y   = $totalH - 14;
         $out = sprintf(

tests/Unit/Service/SvgRendererTest.php

@@ -0,0 +1,120 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Tests\Unit\Service;
+
+use App\Service\SvgRenderer;
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\Test;
+use PHPUnit\Framework\TestCase;
+
+#[CoversClass(SvgRenderer::class)]
+final class SvgRendererTest extends TestCase
+{
+    private SvgRenderer $renderer;
+
+    protected function setUp(): void
+    {
+        $this->renderer = new SvgRenderer();
+    }
+
+    #[Test]
+    public function it_returns_a_valid_svg_element(): void
+    {
+        $svg = $this->renderer->render([]);
+
+        $this->assertStringStartsWith('<svg', $svg);
+        $this->assertStringEndsWith('</svg>', $svg);
+    }
+
+    #[Test]
+    public function it_includes_accessibility_attributes(): void
+    {
+        $svg = $this->renderer->render([]);
+
+        $this->assertStringContainsString('role="img"', $svg);
+        $this->assertStringContainsString('aria-label="Contribution graph"', $svg);
+    }
+
+    #[Test]
+    public function it_applies_dark_theme_background_color(): void
+    {
+        $svg = $this->renderer->render([], 'dark');
+
+        $this->assertStringContainsString('#0d1117', $svg);
+    }
+
+    #[Test]
+    public function it_applies_light_theme_background_color(): void
+    {
+        $svg = $this->renderer->render([], 'light');
+
+        $this->assertStringContainsString('#ffffff', $svg);
+    }
+
+    #[Test]
+    public function it_falls_back_to_dark_theme_for_unknown_theme_names(): void
+    {
+        $svg = $this->renderer->render([], 'unknown');
+
+        $this->assertStringContainsString('#0d1117', $svg);
+    }
+
+    #[Test]
+    public function it_shows_zero_contributions_when_no_data_is_provided(): void
+    {
+        $svg = $this->renderer->render([]);
+
+        $this->assertStringContainsString('0 contributions in the last year', $svg);
+    }
+
+    #[Test]
+    public function it_displays_formatted_total_contribution_count(): void
+    {
+        $today = (new \DateTimeImmutable('today'))->format('Y-m-d');
+
+        $svg = $this->renderer->render([$today => 1234]);
+
+        $this->assertStringContainsString('1,234 contributions in the last year', $svg);
+    }
+
+    #[Test]
+    public function it_renders_all_53_week_columns(): void
+    {
+        $svg = $this->renderer->render([]);
+
+        // MARGIN_X(28) + col_52 * STEP(13) = 704
+        $this->assertStringContainsString('x="704"', $svg);
+    }
+
+    #[Test]
+    public function it_renders_day_of_week_labels_matching_github(): void
+    {
+        $svg = $this->renderer->render([]);
+
+        $this->assertStringContainsString('>Mon<', $svg);
+        $this->assertStringContainsString('>Wed<', $svg);
+        $this->assertStringContainsString('>Fri<', $svg);
+    }
+
+    #[Test]
+    public function it_renders_a_legend_with_less_and_more_labels(): void
+    {
+        $svg = $this->renderer->render([]);
+
+        $this->assertStringContainsString('>Less<', $svg);
+        $this->assertStringContainsString('>More<', $svg);
+    }
+
+    #[Test]
+    public function it_sums_contributions_from_multiple_dates(): void
+    {
+        $today     = (new \DateTimeImmutable('today'))->format('Y-m-d');
+        $yesterday = (new \DateTimeImmutable('yesterday'))->format('Y-m-d');
+
+        $svg = $this->renderer->render([$today => 3, $yesterday => 7]);
+
+        $this->assertStringContainsString('10 contributions in the last year', $svg);
+    }
+}