# Determines if conditions are met for running subsequent jobs on a Pull Request.
#
# !! IMPORTANT !!
# This workflow RELIES on being called from a parent workflow triggered by
# a `pull_request` or `pull_request_target` event. It uses `github.event`
# to access PR details.
#
# It checks if all the following conditions are TRUE:
# 1. The PR is NOT from a fork (i.e., it's an internal PR).
# 2. The PR has been approved by a maintainer (`is_pr_approved_by_maintainer`).
# 3. The PR's source branch does NOT match an excluded pattern.
# 4. The PR includes relevant file changes (`paths_filter_patterns`).
#
# It outputs `should_run` as 'true' if ALL conditions pass, 'false' otherwise.

name: PR Eligibility Check

on:
  workflow_call:
    inputs:
      is_pr_approved_by_maintainer:
        required: true
        type: boolean
      paths_filter_patterns:
        description: "Path filter patterns for 'paths-filter-action'."
        required: false
        type: string
        default: |
          not_ignored:
            - '!.devcontainer/**'
            - '!.github/*'
            - '!.github/scripts/*'
            - '!.github/workflows/benchmark-*'
            - '!.github/workflows/check-*'
            - '!.vscode/**'
            - '!docker/**'
            - '!packages/@n8n/benchmark/**'
            - '!**/*.md'
      excluded_source_branch_patterns:
        description: 'Newline-separated list of glob patterns for source branches to EXCLUDE.'
        required: false
        type: string
        default: |
          release/*
          master

    outputs:
      should_run:
        description: "Outputs 'true' if all eligibility checks pass, otherwise 'false'."
        value: ${{ jobs.evaluate_conditions.outputs.run_decision }}

jobs:
  evaluate_conditions:
    runs-on: ubuntu-latest
    outputs:
      run_decision: ${{ steps.evaluate.outputs.should_run }}
    steps:
      - name: Check out current commit
        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
        with:
          ref: ${{ github.event.pull_request.head.sha }}

      - name: Determine changed files
        uses: tomi/paths-filter-action@32c62f5ca100c1110406e3477d5b3ecef4666fec # v3.0.2
        id: changed
        with:
          filters: ${{ inputs.paths_filter_patterns }}
          predicate-quantifier: 'every'

      - name: Evaluate Conditions & Set Output
        id: evaluate
        env:
          IS_FORK: ${{ github.event.pull_request.head.repo.fork }}
          IS_APPROVED: ${{ inputs.is_pr_approved_by_maintainer }}
          FILES_CHANGED: ${{ steps.changed.outputs.not_ignored == 'true' }}
          HEAD_REF: ${{ github.event.pull_request.head.ref }}
          EXCLUDED_PATTERNS: ${{ inputs.excluded_source_branch_patterns }}
        run: |
          if [[ "$IS_FORK" == "true" ]]; then
            is_community="true"
          else
            is_community="false"
          fi

          source_branch_excluded="false"
          while IFS= read -r pattern; do
            # shellcheck disable=SC2053
            if [[ -n "$pattern" && "$HEAD_REF" == $pattern ]]; then
                source_branch_excluded="true"
                break
            fi
          done <<< "$EXCLUDED_PATTERNS"

          echo "--- Checking Conditions ---"
          echo "Is NOT Community PR: $([[ "$is_community" == "false" ]] && echo true || echo false)"
          echo "Files Changed: $FILES_CHANGED"
          echo "Source Branch Excluded: $source_branch_excluded"
          echo "Is Approved: $IS_APPROVED"
          echo "-------------------------"

          if [[ "$is_community" == "false" && \
                "$FILES_CHANGED" == "true" && \
                "$source_branch_excluded" == "false" && \
                "$IS_APPROVED" == "true" ]]; then
            echo "Decision: Conditions met. Setting should_run=true."
            echo "should_run=true" >> "$GITHUB_OUTPUT"
          else
            echo "Decision: Conditions not met. Setting should_run=false."
            echo "should_run=false" >> "$GITHUB_OUTPUT"
          fi