name: Vally Lint — PR Gate

on:
  pull_request:
    branches: [main]
    types: [opened, synchronize, reopened]
    paths:
      - "skills/**"
      - "agents/**"
      - "plugins/**/skills/**"
      - "plugins/**/agents/**"

permissions:
  contents: read

jobs:
  skill-check:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          fetch-depth: 0

      - name: Setup Node.js
        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
        with:
          node-version: 20

      # ── Detect changed skills & agents ────────────────────────────
      - name: Detect changed skills and agents
        id: detect
        run: |
          declare -A SEEN_SKILL_DIRS=()
          declare -A SEEN_AGENT_FILES=()
          SKILL_DIRS=()
          AGENT_FILES=()

          while IFS= read -r -d '' file; do
            case "$file" in
              skills/*)
                skill_dir="${file#skills/}"
                skill_dir="skills/${skill_dir%%/*}"
                if [ -d "$skill_dir" ] && [ -z "${SEEN_SKILL_DIRS[$skill_dir]+x}" ]; then
                  SEEN_SKILL_DIRS["$skill_dir"]=1
                  SKILL_DIRS+=("$skill_dir")
                fi
                ;;
              plugins/*/skills/*)
                IFS='/' read -r seg1 seg2 seg3 seg4 _ <<< "$file"
                skill_dir="$seg1/$seg2/$seg3/$seg4"
                if [ -d "$skill_dir" ] && [ -z "${SEEN_SKILL_DIRS[$skill_dir]+x}" ]; then
                  SEEN_SKILL_DIRS["$skill_dir"]=1
                  SKILL_DIRS+=("$skill_dir")
                fi
                ;;
            esac

            case "$file" in
              agents/*.agent.md|plugins/*/agents/*.agent.md)
                if [ -f "$file" ] && [ -z "${SEEN_AGENT_FILES[$file]+x}" ]; then
                  SEEN_AGENT_FILES["$file"]=1
                  AGENT_FILES+=("$file")
                fi
                ;;
            esac
          done < <(git diff --name-only -z "origin/${{ github.base_ref }}...HEAD")

          SKILL_COUNT=${#SKILL_DIRS[@]}
          AGENT_COUNT=${#AGENT_FILES[@]}
          TOTAL=$((SKILL_COUNT + AGENT_COUNT))

          {
            echo "total=$TOTAL"
            echo "skill_count=$SKILL_COUNT"
            echo "agent_count=$AGENT_COUNT"
            echo "skill_dirs<<EOF"
            printf '%s\n' "${SKILL_DIRS[@]}"
            echo "EOF"
            echo "agent_files<<EOF"
            printf '%s\n' "${AGENT_FILES[@]}"
            echo "EOF"
          } >> "$GITHUB_OUTPUT"

          echo "Found $SKILL_COUNT skill dir(s) and $AGENT_COUNT agent file(s) to check."

      # ── Run vally lint check ───────────────────────────────────────
      - name: Run vally lint check
        id: check
        if: steps.detect.outputs.total != '0'
        env:
          SKILL_DIRS_RAW: ${{ steps.detect.outputs.skill_dirs }}
          AGENT_FILES_RAW: ${{ steps.detect.outputs.agent_files }}
        run: |
          SKILL_DIRS=()
          AGENT_FILES=()

          if [ -n "$SKILL_DIRS_RAW" ]; then
            while IFS= read -r dir; do
              [ -n "$dir" ] && SKILL_DIRS+=("$dir")
            done <<< "$SKILL_DIRS_RAW"
          fi

          if [ -n "$AGENT_FILES_RAW" ]; then
            while IFS= read -r file; do
              [ -n "$file" ] && AGENT_FILES+=("$file")
            done <<< "$AGENT_FILES_RAW"
          fi

          EXIT_CODE=0
          : > vally-output.txt

          if [ ${#SKILL_DIRS[@]} -eq 0 ] && [ ${#AGENT_FILES[@]} -eq 0 ]; then
            echo "No skills or agents to validate." | tee -a vally-output.txt
          fi

          for skill_dir in "${SKILL_DIRS[@]}"; do
            echo "### Linting ${skill_dir}" | tee -a vally-output.txt
            set +e
            OUTPUT=$(npx --yes @microsoft/vally-cli lint "$skill_dir" --verbose 2>&1)
            CMD_EXIT=$?
            set -e
            echo "$OUTPUT" | tee -a vally-output.txt
            echo "" >> vally-output.txt

            if [ "$CMD_EXIT" -ne 0 ]; then
              EXIT_CODE=1
            fi
          done

          if [ ${#AGENT_FILES[@]} -gt 0 ]; then
            {
              echo "### Agent files detected (not linted by vally)"
              echo "ℹ️ Vally currently lints SKILL.md content. Agent files were detected but skipped:"
              printf '%s\n' "${AGENT_FILES[@]}"
              echo ""
            } | tee -a vally-output.txt
          fi

          echo "exit_code=$EXIT_CODE" >> "$GITHUB_OUTPUT"

      # ── Upload results for the commenting workflow ────────────────
      - name: Save metadata
        if: always()
        run: |
          mkdir -p vally-results
          echo "${{ github.event.pull_request.number }}" > vally-results/pr-number.txt
          echo "${{ steps.detect.outputs.total }}" > vally-results/total.txt
          echo "${{ steps.detect.outputs.skill_count }}" > vally-results/skill-count.txt
          echo "${{ steps.detect.outputs.agent_count }}" > vally-results/agent-count.txt
          echo "${{ steps.check.outputs.exit_code }}" > vally-results/exit-code.txt
          if [ -f vally-output.txt ]; then
            cp vally-output.txt vally-results/vally-output.txt
          fi

      - name: Upload results
        if: always()
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
        with:
          name: vally-lint-results
          path: vally-results/
          retention-days: 1

      - name: Post skip notice if no skills changed
        if: steps.detect.outputs.total == '0'
        run: echo "No skill or agent files changed in this PR — skipping validation."
