name: contrib

on:
  issue_comment:
    types: [created, edited]
  # zizmor: ignore[dangerous-triggers] We explicitly want to run on pull_request_target.
  pull_request_target:
    types:
      - opened
      - closed
      - synchronize
      - labeled
      - unlabeled
      - reopened
      - edited
      # For jobs that don't run on draft PRs.
      - ready_for_review

permissions:
  contents: read

# Only run one instance per PR to ensure in-order execution.
concurrency: pr-${{ github.ref }}

jobs:
  community-label:
    runs-on: ubuntu-latest
    permissions:
      pull-requests: write
    if: >-
      ${{
        github.event_name == 'pull_request_target' &&
        github.event.action == 'opened'
      }}
    steps:
      - name: Generate app token
        id: app-token
        uses: actions/create-github-app-token@bcd2ba49218906704ab6c1aa796996da409d3eb1 # v3.2.0
        with:
          app-id: ${{ vars.ORG_MEMBERSHIP_APP_ID }}
          private-key: ${{ secrets.ORG_MEMBERSHIP_APP_PRIVATE_KEY }}
      - name: Add community label
        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
        env:
          APP_TOKEN: ${{ steps.app-token.outputs.token }}
        with:
          # Default GITHUB_TOKEN handles label writes via the
          # `github` object (needs pull-requests: write). The App
          # token is scoped to members: read only and used via a
          # separate Octokit client for the membership check.
          script: |
            const orgClient = getOctokit(process.env.APP_TOKEN)

            const params = {
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
            }

            const labels = context.payload.pull_request.labels.map((label) => label.name)
            if (labels.includes("community")) {
              console.log('PR already has "community" label.')
              return
            }

            // author_association can be unreliable: it returns
            // CONTRIBUTOR instead of MEMBER when both apply, and
            // returns NONE for members with private org visibility.
            // Use the org membership API as the source of truth.
            // See: https://github.com/actions/github-script/issues/643
            const author = context.payload.pull_request.user.login

            // Dependabot is not a community contributor.
            if (author === 'dependabot[bot]') {
              console.log('Author "%s" is a bot, skipping.', author)
              return
            }

            try {
              await orgClient.rest.orgs.checkMembershipForUser({
                org: context.repo.owner,
                username: author,
              })
              console.log('Author "%s" is an org member, skipping.', author)
              return
            } catch (error) {
              if (error.status !== 404 && error.status !== 302) {
                throw error
              }
            }

            console.log('Adding "community" label for author "%s".', author)
            // Uses the default GITHUB_TOKEN via the `github` object.
            await github.rest.issues.addLabels({
              ...params,
              labels: ["community"],
            })

  cla:
    runs-on: ubuntu-latest
    permissions:
      pull-requests: write
    steps:
      - name: cla
        if: (github.event.comment.body == 'recheck' || github.event.comment.body == 'I have read the CLA Document and I hereby sign the CLA') || github.event_name == 'pull_request_target'
        uses: contributor-assistant/github-action@ca4a40a7d1004f18d9960b404b97e5f30a505a08 # v2.6.1
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          # the below token should have repo scope and must be manually added by you in the repository's secret
          PERSONAL_ACCESS_TOKEN: ${{ secrets.CDRCI2_GITHUB_TOKEN }}
        with:
          remote-organization-name: "coder"
          remote-repository-name: "cla"
          path-to-signatures: "v2022-09-04/signatures.json"
          path-to-document: "https://github.com/coder/cla/blob/main/README.md"
          # branch should not be protected
          branch: "main"
          # Some users have signed a corporate CLA with Coder so are exempt from signing our community one.
          allowlist: "coryb,aaronlehmann,dependabot*,blink-so*,blinkagent*"

  title:
    runs-on: ubuntu-latest
    if: ${{ github.event_name == 'pull_request_target' }}
    steps:
      - name: Validate PR title
        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
        with:
          script: |
            const { pull_request } = context.payload;
            const title = pull_request.title;
            const repo = { owner: context.repo.owner, repo: context.repo.repo };

            const allowedTypes = [
              "feat", "fix", "docs", "style", "refactor",
              "perf", "test", "build", "ci", "chore", "revert",
            ];
            const expectedFormat = `"type(scope): description" or "type: description"`;
            const guidelinesLink = `See: https://github.com/coder/coder/blob/main/docs/about/contributing/CONTRIBUTING.md#commit-messages`;
            const scopeHint = (type) =>
              `Use a broader scope or no scope (e.g., "${type}: ...") for cross-cutting changes.\n` +
              guidelinesLink;

            console.log("Title: %s", title);

            // Parse conventional commit format: type(scope)!: description
            const match = title.match(/^(\w+)(\(([^)]*)\))?(!)?\s*:\s*.+/);
            if (!match) {
              core.setFailed(
                `PR title does not match conventional commit format.\n` +
                `Expected: ${expectedFormat}\n` +
                `Allowed types: ${allowedTypes.join(", ")}\n` +
                guidelinesLink
              );
              return;
            }

            const type = match[1];
            const scope = match[3]; // undefined if no parentheses

            // Validate type.
            if (!allowedTypes.includes(type)) {
              core.setFailed(
                `PR title has invalid type "${type}".\n` +
                `Expected: ${expectedFormat}\n` +
                `Allowed types: ${allowedTypes.join(", ")}\n` +
                guidelinesLink
              );
              return;
            }

            // If no scope, we're done.
            if (!scope) {
              console.log("No scope provided, title is valid.");
              return;
            }

            console.log("Scope: %s", scope);

            // Fetch changed files.
            const files = await github.paginate(github.rest.pulls.listFiles, {
              ...repo,
              pull_number: pull_request.number,
              per_page: 100,
            });
            const changedPaths = files.map(f => f.filename);
            console.log("Changed files: %d", changedPaths.length);

            // Derive scope type from the changed files. The diff is the
            // source of truth: if files exist under the scope, the path
            // exists on the PR branch. No need for Contents API calls.
            const isDir = changedPaths.some(f => f.startsWith(scope + "/"));
            const isFile = changedPaths.some(f => f === scope);
            const isStem = changedPaths.some(f => f.startsWith(scope + "."));

            if (!isDir && !isFile && !isStem) {
              core.setFailed(
                `PR title scope "${scope}" does not match any files changed in this PR.\n` +
                `Scopes must reference a path (directory or file stem) that contains changed files.\n` +
                scopeHint(type)
              );
              return;
            }

            // Verify all changed files fall under the scope.
            const outsideFiles = changedPaths.filter(f => {
              if (isDir && f.startsWith(scope + "/")) return false;
              if (f === scope) return false;
              if (isStem && f.startsWith(scope + ".")) return false;
              return true;
            });

            if (outsideFiles.length > 0) {
              const listed = outsideFiles.map(f => "  - " + f).join("\n");
              core.setFailed(
                `PR title scope "${scope}" does not contain all changed files.\n` +
                `Files outside scope:\n${listed}\n\n` +
                scopeHint(type)
              );
              return;
            }

            console.log("PR title is valid.");

  release-labels:
    runs-on: ubuntu-latest
    permissions:
      pull-requests: write
    # Skip tagging for draft PRs.
    if: ${{ github.event_name == 'pull_request_target' && !github.event.pull_request.draft }}
    steps:
      - name: release-labels
        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
        with:
          # This script ensures PR title and labels are in sync:
          #
          # When release/breaking label is:
          # - Added, rename PR title to include ! (e.g. feat!:)
          # - Removed, rename PR title to strip ! (e.g. feat:)
          #
          # When title is:
          # - Renamed (+!), add the release/breaking label
          # - Renamed (-!), remove the release/breaking label
          script: |
            const releaseLabels = {
              breaking: "release/breaking",
            }

            const { action, changes, label, pull_request } = context.payload
            const { title } = pull_request
            const labels = pull_request.labels.map((label) => label.name)
            const isBreakingTitle = isBreaking(title)

            // Debug information.
            console.log("Action: %s", action)
            console.log("Title: %s", title)
            console.log("Labels: %s", labels.join(", "))

            const params = {
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
            }

            if (action === "opened" || action === "reopened" || action === "ready_for_review") {
              if (isBreakingTitle && !labels.includes(releaseLabels.breaking)) {
                console.log('Add "%s" label', releaseLabels.breaking)
                await github.rest.issues.addLabels({
                  ...params,
                  labels: [releaseLabels.breaking],
                })
              }
            }

            if (action === "edited" && changes.title) {
              if (isBreakingTitle && !labels.includes(releaseLabels.breaking)) {
                console.log('Add "%s" label', releaseLabels.breaking)
                await github.rest.issues.addLabels({
                  ...params,
                  labels: [releaseLabels.breaking],
                })
              }

              if (!isBreakingTitle && labels.includes(releaseLabels.breaking)) {
                const wasBreakingTitle = isBreaking(changes.title.from)
                if (wasBreakingTitle) {
                  console.log('Remove "%s" label', releaseLabels.breaking)
                  await github.rest.issues.removeLabel({
                    ...params,
                    name: releaseLabels.breaking,
                  })
                } else {
                  console.log('Rename title from "%s" to "%s"', title, toBreaking(title))
                  await github.rest.issues.update({
                    ...params,
                    title: toBreaking(title),
                  })
                }
              }
            }

            if (action === "labeled") {
              if (label.name === releaseLabels.breaking && !isBreakingTitle) {
                console.log('Rename title from "%s" to "%s"', title, toBreaking(title))
                await github.rest.issues.update({
                  ...params,
                  title: toBreaking(title),
                })
              }
            }

            if (action === "unlabeled") {
              if (label.name === releaseLabels.breaking && isBreakingTitle) {
                console.log('Rename title from "%s" to "%s"', title, fromBreaking(title))
                await github.rest.issues.update({
                  ...params,
                  title: fromBreaking(title),
                })
              }
            }

            function isBreaking(t) {
              return t.split(" ")[0].endsWith("!:")
            }

            function toBreaking(t) {
              const parts = t.split(" ")
              return [parts[0].replace(/:$/, "!:"), ...parts.slice(1)].join(" ")
            }

            function fromBreaking(t) {
              const parts = t.split(" ")
              return [parts[0].replace(/!:$/, ":"), ...parts.slice(1)].join(" ")
            }