name: CI

on:
  pull_request:
    branches:
      - main

jobs:
  format:
    name: format
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4
      - name: Setup Dart
        uses: dart-lang/setup-dart@v1
      - name: Install dependencies
        run: dart pub get
      - name: Check formatting
        run: dart format --output=none --set-exit-if-changed .

  analyze:
    name: analyze
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4
      - name: Setup Dart
        uses: dart-lang/setup-dart@v1
      - name: Install dependencies
        run: dart pub get
      - name: Run analyzer
        run: dart analyze --fatal-infos

  test:
    name: test
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4
      - name: Setup Dart
        uses: dart-lang/setup-dart@v1
      - name: Install dependencies
        run: dart pub get
      - name: Run tests
        run: dart test

  pana:
    name: pana
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4
      - name: Setup Dart
        uses: dart-lang/setup-dart@v1
      - name: Install dependencies
        run: dart pub get
      - name: Run pana and enforce full score
        run: |
          set -euo pipefail
          dart pub global activate pana
          export PATH="$PATH:$HOME/.pub-cache/bin"

          pana . | tee /tmp/pana.log

          SCORE_LINE="$(grep -Eo 'Points: [0-9]+/[0-9]+' /tmp/pana.log | tail -n1 || true)"
          if [ -z "$SCORE_LINE" ]; then
            echo "Could not parse pana score output."
            exit 1
          fi

          SCORE="${SCORE_LINE#Points: }"
          GOT="${SCORE%/*}"
          MAX="${SCORE#*/}"

          if [ "$GOT" -ne "$MAX" ]; then
            echo "Pana score must be full. Got $SCORE."
            exit 1
          fi

          echo "Pana full score confirmed: $SCORE"

  version_and_changelog:
    name: version-and-changelog
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
      - name: Validate release metadata for PRs into main
        run: |
          set -euo pipefail

          if [ "${GITHUB_EVENT_NAME}" != "pull_request" ]; then
            echo "Not a pull_request event; skipping version/changelog gate."
            exit 0
          fi

          if [ -z "${GITHUB_BASE_REF:-}" ]; then
            echo "GITHUB_BASE_REF is not set for pull_request event."
            exit 1
          fi

          git fetch origin "${GITHUB_BASE_REF}" --depth=1

          if git diff --quiet "origin/${GITHUB_BASE_REF}...HEAD" -- pubspec.yaml README.md ':(glob)**/*.dart'; then
            echo "No release-relevant files changed (pubspec.yaml, README.md, *.dart); skipping version/changelog gate."
            exit 0
          fi

          PACKAGE_NAME="$(sed -nE 's/^name:\s*([^[:space:]]+)\s*$/\1/p' pubspec.yaml | head -n1)"
          PR_VERSION="$(sed -nE 's/^version:\s*([^[:space:]]+)\s*$/\1/p' pubspec.yaml | head -n1)"
          BASE_HAS_PUBSPEC="false"
          BASE_VERSION=""

          if git cat-file -e "origin/${GITHUB_BASE_REF}:pubspec.yaml" 2>/dev/null; then
            BASE_HAS_PUBSPEC="true"
            BASE_VERSION="$(git show "origin/${GITHUB_BASE_REF}:pubspec.yaml" | sed -nE 's/^version:\s*([^[:space:]]+)\s*$/\1/p' | head -n1)"
          fi

          if [ -z "$PACKAGE_NAME" ] || [ -z "$PR_VERSION" ]; then
            echo "Unable to read package name/version from PR pubspec.yaml."
            exit 1
          fi

          if [ "$BASE_HAS_PUBSPEC" = "true" ]; then
            if [ -z "$BASE_VERSION" ]; then
              echo "Unable to read version from base branch pubspec.yaml."
              exit 1
            fi

            parse_semver_core() {
              printf '%s' "$1" | sed -E 's/^([0-9]+\.[0-9]+\.[0-9]+).*/\1/'
            }

            BASE_CORE="$(parse_semver_core "$BASE_VERSION")"
            PR_CORE="$(parse_semver_core "$PR_VERSION")"

            if ! printf '%s' "$BASE_CORE" | grep -Eq '^[0-9]+\.[0-9]+\.[0-9]+$'; then
              echo "Base version is not valid semver: $BASE_VERSION"
              exit 1
            fi

            if ! printf '%s' "$PR_CORE" | grep -Eq '^[0-9]+\.[0-9]+\.[0-9]+$'; then
              echo "PR version is not valid semver: $PR_VERSION"
              exit 1
            fi

            BASE_MAJOR="${BASE_CORE%%.*}"
            BASE_REST="${BASE_CORE#*.}"
            BASE_MINOR="${BASE_REST%%.*}"
            BASE_PATCH="${BASE_REST#*.}"

            PR_MAJOR="${PR_CORE%%.*}"
            PR_REST="${PR_CORE#*.}"
            PR_MINOR="${PR_REST%%.*}"
            PR_PATCH="${PR_REST#*.}"

            if [ "$PR_MAJOR" -lt "$BASE_MAJOR" ]; then
              echo "pubspec.yaml version must be greater than base version ($BASE_VERSION -> $PR_VERSION)."
              exit 1
            fi

            if [ "$PR_MAJOR" -eq "$BASE_MAJOR" ] && [ "$PR_MINOR" -lt "$BASE_MINOR" ]; then
              echo "pubspec.yaml version must be greater than base version ($BASE_VERSION -> $PR_VERSION)."
              exit 1
            fi

            if [ "$PR_MAJOR" -eq "$BASE_MAJOR" ] && [ "$PR_MINOR" -eq "$BASE_MINOR" ] && [ "$PR_PATCH" -lt "$BASE_PATCH" ]; then
              echo "pubspec.yaml version must be greater than base version ($BASE_VERSION -> $PR_VERSION)."
              exit 1
            fi

            if [ "$PR_MAJOR" -eq "$BASE_MAJOR" ] && [ "$PR_MINOR" -eq "$BASE_MINOR" ] && [ "$PR_PATCH" -eq "$BASE_PATCH" ]; then
              if curl -fsSL "https://pub.dev/api/packages/${PACKAGE_NAME}" | grep -q "\"version\":\"${PR_VERSION}\""; then
                echo "pubspec.yaml version must be at least 0.0.1 greater than base version ($BASE_VERSION -> $PR_VERSION)."
                exit 1
              fi

              echo "Version unchanged ($PR_VERSION), but this version is not yet on pub.dev; allowing first publish."
            fi
          else
            echo "Base branch has no pubspec.yaml; treating this as first release."
          fi

          if git diff --quiet "origin/${GITHUB_BASE_REF}...HEAD" -- CHANGELOG.md; then
            echo "CHANGELOG.md must be updated in the PR."
            exit 1
          fi

          if ! grep -Fq "## $PR_VERSION" CHANGELOG.md && ! grep -Fq "## [$PR_VERSION]" CHANGELOG.md; then
            echo "CHANGELOG.md must include a heading for version $PR_VERSION."
            exit 1
          fi

          if [ "$BASE_HAS_PUBSPEC" = "true" ]; then
            echo "Version/changelog gate passed: $BASE_VERSION -> $PR_VERSION"
          else
            echo "Version/changelog gate passed for first release: $PR_VERSION"
          fi