name: Unbound Release

on:
  workflow_call:
    inputs:
      tag_only:
        description: 'Set to true to only create tags without full releases'
        required: false
        default: false
        type: boolean

concurrency:
  group: release-${{ github.repository }}
  cancel-in-progress: false

env:
  GITEA_URL: http://gitea-http.gitea.svc.cluster.local:3000
  RELEASE_TOKEN_FILE: /runner-secrets/release-token
  GIT_CLIFF_VERSION: "2.13.1"

jobs:
  preconditions:
    name: Check Preconditions
    runs-on: ubuntu-latest
    steps:
      - name: Validate token
        run: |
          if [ ! -r "${RELEASE_TOKEN_FILE}" ]; then
            echo "Release token file not found at ${RELEASE_TOKEN_FILE}"
            echo "This workflow requires the runner to have RELEASE_TOKEN configured."
            exit 1
          fi
          if [ ! -s "${RELEASE_TOKEN_FILE}" ]; then
            echo "Release token file is empty"
            exit 1
          fi
          echo "Release token found"

  changelog-and-pr:
    name: Generate Changelog and Handle PR
    runs-on: ubuntu-latest
    needs: preconditions
    if: github.ref_type == 'branch' && github.ref_name == github.event.repository.default_branch
    steps:
      - name: Checkout
        uses: actions/checkout@v7
        with:
          fetch-depth: 0

      - name: Install git-cliff
        run: |
          curl -sSfL "https://github.com/orhun/git-cliff/releases/download/v${GIT_CLIFF_VERSION}/git-cliff-${GIT_CLIFF_VERSION}-x86_64-unknown-linux-gnu.tar.gz" | tar xz
          sudo mv "git-cliff-${GIT_CLIFF_VERSION}/git-cliff" /usr/local/bin/
          git-cliff --version

      - name: Generate changelog
        run: |
          git-cliff --bump --unreleased --strip header > CHANGES.md
          git-cliff --bump | sed "s/[[:space:]]\+$//" > CHANGELOG.md

      - name: Get bumped version
        id: version
        run: |
          VERSION=$(git-cliff --bumped-version 2>/dev/null || echo "")
          echo "version=${VERSION}" >> $GITHUB_OUTPUT
          echo "${VERSION}" > VERSION

      - name: Check for changes
        id: check
        run: |
          LATEST=$(cat .version 2>/dev/null | jq -r '.version' 2>/dev/null || git describe --abbrev=0 --tags 2>/dev/null || echo '')
          VERSION=$(cat VERSION)
          if [ -n "${LATEST}" ] && [ "${VERSION}" = "${LATEST}" ]; then
            echo "has_changes=false" >> $GITHUB_OUTPUT
          else
            echo "has_changes=true" >> $GITHUB_OUTPUT
          fi

      - name: Create or update release PR
        if: steps.check.outputs.has_changes == 'true'
        env:
          REPOSITORY: ${{ github.repository }}
          DEFAULT_BRANCH: ${{ github.event.repository.default_branch }}
        run: |
          TOKEN=$(cat "${RELEASE_TOKEN_FILE}")
          VERSION=$(cat VERSION)
          OWNER=$(echo "${REPOSITORY}" | cut -d'/' -f1)
          REPO=$(echo "${REPOSITORY}" | cut -d'/' -f2)
          API_URL="${GITEA_URL}/api/v1/repos/${OWNER}/${REPO}"
          BASE_BRANCH="${DEFAULT_BRANCH:-main}"
          echo "Using base branch: ${BASE_BRANCH}"

          TITLE="chore(release): prepare for ${VERSION}"
          CHANGES_CONTENT=$(cat CHANGES.md)
          PR_NOTE="**Note:** Please use **Squash Merge** when merging this PR."
          DESCRIPTION="${CHANGES_CONTENT}"$'\n\n---\n\n'"${PR_NOTE}"
          CHANGELOG_CONTENT=$(base64 -w0 < CHANGELOG.md)
          VERSION_CONTENT=$(jq -n --arg v "${VERSION}" '{"version":$v}' | base64 -w0)

          # api_call METHOD PATH [JSON_BODY]
          # Stdout: first line "<http_code>|<curl_rc>", then response body.
          # Never returns non-zero so callers must inspect http_code; this
          # prevents curl exit codes (e.g. CURLE_WRITE_ERROR / 23) from
          # killing the script via `set -e` inside command substitutions.
          api_call() {
            local method="$1" path="$2" data="${3:-}"
            local body_file http_code rc=0
            body_file=$(mktemp)
            local args=(-sS --retry 3 --retry-delay 2 --retry-all-errors
                        -w '%{http_code}'
                        -o "${body_file}"
                        -X "${method}"
                        -H "Authorization: token ${TOKEN}")
            if [ -n "${data}" ]; then
              args+=(-H "Content-Type: application/json" --data "${data}")
            fi
            http_code=$(curl "${args[@]}" "${API_URL}${path}" 2>/dev/null) || rc=$?
            printf '%s|%s\n' "${http_code:-000}" "${rc}"
            cat "${body_file}"
            rm -f "${body_file}"
            return 0
          }

          # Extract first-line meta and remaining body from api_call output.
          meta_line() { printf '%s\n' "$1" | head -n1; }
          body_lines() { printf '%s\n' "$1" | tail -n +2; }
          http_of() { local m; m=$(meta_line "$1"); printf '%s' "${m%%|*}"; }
          ok_code() { [ -n "$1" ] && [ "$1" -ge 200 ] 2>/dev/null && [ "$1" -lt 400 ]; }

          # Delete existing next-release branch if it exists (auto-closes any open PR)
          echo "Checking for existing next-release branch..."
          OUT=$(api_call GET "/branches/next-release")
          CODE=$(http_of "${OUT}")
          if [ "${CODE}" = "200" ]; then
            echo "Deleting existing next-release branch..."
            OUT=$(api_call DELETE "/branches/next-release")
            echo "  delete result: $(meta_line "${OUT}")"
          else
            echo "  no existing branch (HTTP ${CODE})"
          fi

          # Explicitly create next-release branch from base
          echo "Creating next-release branch from ${BASE_BRANCH}..."
          BRANCH_PAYLOAD=$(jq -n --arg new "next-release" --arg old "${BASE_BRANCH}" \
            '{new_branch_name: $new, old_branch_name: $old}')
          for i in $(seq 1 5); do
            OUT=$(api_call POST "/branches" "${BRANCH_PAYLOAD}")
            META=$(meta_line "${OUT}"); BODY=$(body_lines "${OUT}"); CODE="${META%%|*}"
            if ok_code "${CODE}"; then
              echo "Branch created (${META})"
              break
            fi
            if [ "${i}" = "5" ]; then
              echo "Branch create failed after 5 attempts (${META}): ${BODY}"
              exit 1
            fi
            echo "  attempt ${i}/5 (${META}): ${BODY} — retrying..."
            sleep 3
          done

          # Poll until branch is readable
          echo "Waiting for branch readiness..."
          for i in $(seq 1 10); do
            OUT=$(api_call GET "/branches/next-release")
            META=$(meta_line "${OUT}"); CODE="${META%%|*}"
            if [ "${CODE}" = "200" ]; then
              echo "Branch ready after ${i} attempt(s)"
              break
            fi
            if [ "${i}" = "10" ]; then
              echo "Branch not ready after 10 attempts (last: ${META})"
              exit 1
            fi
            echo "  attempt ${i}/10 (${META}) — waiting..."
            sleep 2
          done

          # Fetch file blob SHA from BASE_BRANCH. next-release was just forked
          # from base so the blob SHA matches; querying base avoids racing
          # Gitea's per-endpoint propagation for the new branch (the /contents
          # endpoint can still 500/404 after /branches reports 200). Returns
          # empty only when the file genuinely does not exist on base.
          fetch_sha() {
            local path="$1" out meta code body
            for i in $(seq 1 5); do
              out=$(api_call GET "/contents/${path}?ref=${BASE_BRANCH}")
              meta=$(meta_line "${out}"); code="${meta%%|*}"; body=$(body_lines "${out}")
              if [ "${code}" = "200" ]; then
                printf '%s' "${body}" | jq -r '.sha // empty'
                return 0
              fi
              if [ "${code}" = "404" ]; then
                return 0
              fi
              if [ "${i}" = "5" ]; then
                echo "fetch_sha ${path} failed after 5 attempts (${meta}): ${body}" >&2
                return 0
              fi
              sleep 2
            done
          }
          CHANGELOG_SHA=$(fetch_sha "CHANGELOG.md")
          VERSION_SHA=$(fetch_sha ".version")

          # Write file with retry. Args: PATH CONTENT_B64 [SHA]
          write_file() {
            local path="$1" content="$2" sha="${3:-}"
            local method payload out meta body code
            if [ -n "${sha}" ]; then
              method=PUT
              payload=$(jq -n \
                --arg content "${content}" \
                --arg sha "${sha}" \
                --arg message "${TITLE}" \
                --arg branch "next-release" \
                '{content: $content, sha: $sha, message: $message, branch: $branch}')
            else
              method=POST
              payload=$(jq -n \
                --arg content "${content}" \
                --arg message "${TITLE}" \
                --arg branch "next-release" \
                '{content: $content, message: $message, branch: $branch}')
            fi
            for i in $(seq 1 5); do
              out=$(api_call "${method}" "/contents/${path}" "${payload}")
              meta=$(meta_line "${out}"); body=$(body_lines "${out}"); code="${meta%%|*}"
              if ok_code "${code}"; then
                echo "${path} write succeeded (${meta})"
                return 0
              fi
              if [ "${i}" = "5" ]; then
                echo "${path} write failed after 5 attempts (${meta}): ${body}"
                return 1
              fi
              echo "  ${path} attempt ${i}/5 (${meta}): ${body} — retrying..."
              sleep 3
            done
          }

          echo "Writing CHANGELOG.md to next-release..."
          write_file "CHANGELOG.md" "${CHANGELOG_CONTENT}" "${CHANGELOG_SHA}"
          echo "Writing .version to next-release..."
          write_file ".version" "${VERSION_CONTENT}" "${VERSION_SHA}"

          # Create PR
          echo "Creating PR..."
          PR_DATA=$(jq -n \
            --arg title "${TITLE}" \
            --arg body "${DESCRIPTION}" \
            --arg head "next-release" \
            --arg base "${BASE_BRANCH}" \
            '{title: $title, body: $body, head: $head, base: $base}')
          for i in $(seq 1 5); do
            OUT=$(api_call POST "/pulls" "${PR_DATA}")
            META=$(meta_line "${OUT}"); BODY=$(body_lines "${OUT}"); CODE="${META%%|*}"
            if ok_code "${CODE}"; then
              echo "PR created (${META})"
              break
            fi
            if [ "${i}" = "5" ]; then
              echo "PR creation failed after 5 attempts (${META}): ${BODY}"
              exit 1
            fi
            echo "  PR attempt ${i}/5 (${META}): ${BODY} — retrying..."
            sleep 3
          done

  create-release:
    name: Create Release
    runs-on: ubuntu-latest
    needs: preconditions
    if: |
      github.ref_type == 'branch' &&
      github.ref_name == github.event.repository.default_branch &&
      inputs.tag_only != true
    steps:
      - name: Checkout
        uses: actions/checkout@v7
        with:
          fetch-depth: 0

      - name: Install git-cliff
        run: |
          curl -sSfL "https://github.com/orhun/git-cliff/releases/download/v${GIT_CLIFF_VERSION}/git-cliff-${GIT_CLIFF_VERSION}-x86_64-unknown-linux-gnu.tar.gz" | tar xz
          sudo mv "git-cliff-${GIT_CLIFF_VERSION}/git-cliff" /usr/local/bin/
          git-cliff --version

      - name: Generate changelog
        run: git-cliff --bump --unreleased --strip header > CHANGES.md

      - name: Get version
        id: version
        run: |
          VERSION=$(git-cliff --bumped-version 2>/dev/null || echo "")
          echo "version=${VERSION}" >> $GITHUB_OUTPUT

      - name: Create release
        env:
          REPOSITORY: ${{ github.repository }}
          DEFAULT_BRANCH: ${{ github.event.repository.default_branch }}
          VERSION: ${{ steps.version.outputs.version }}
        run: |
          TOKEN=$(cat "${RELEASE_TOKEN_FILE}")
          if [ ! -r .version ]; then
            echo "Version file not found"
            exit 0
          fi

          CURRENT_VERSION=$(cat .version 2>/dev/null | jq -r '.version')
          LATEST=$(git describe --abbrev=0 --tags 2>/dev/null || echo '')

          if [ -n "${LATEST}" ] && [ "${CURRENT_VERSION}" = "${LATEST}" ]; then
            echo "Version ${CURRENT_VERSION} already exists"
            exit 0
          fi

          OWNER=$(echo "${REPOSITORY}" | cut -d'/' -f1)
          REPO=$(echo "${REPOSITORY}" | cut -d'/' -f2)
          API_URL="${GITEA_URL}/api/v1/repos/${OWNER}/${REPO}"

          MESSAGE=$(cat CHANGES.md)

          echo "Creating release ${VERSION}..."
          curl -sf --retry 3 --retry-delay 2 --retry-connrefused -X POST \
            -H "Authorization: token ${TOKEN}" \
            -H "Content-Type: application/json" \
            --data "$(jq -n \
              --arg tag_name "${VERSION}" \
              --arg name "${VERSION}" \
              --arg body "${MESSAGE}" \
              --arg target "${DEFAULT_BRANCH}" \
              '{tag_name: $tag_name, name: $name, body: $body, target_commitish: $target}')" \
            "${API_URL}/releases"

  create-tag:
    name: Create Tag
    runs-on: ubuntu-latest
    needs: preconditions
    if: |
      github.ref_type == 'branch' &&
      github.ref_name == github.event.repository.default_branch &&
      inputs.tag_only == true
    steps:
      - name: Checkout
        uses: actions/checkout@v7
        with:
          fetch-depth: 0

      - name: Install git-cliff
        run: |
          curl -sSfL "https://github.com/orhun/git-cliff/releases/download/v${GIT_CLIFF_VERSION}/git-cliff-${GIT_CLIFF_VERSION}-x86_64-unknown-linux-gnu.tar.gz" | tar xz
          sudo mv "git-cliff-${GIT_CLIFF_VERSION}/git-cliff" /usr/local/bin/
          git-cliff --version

      - name: Get version
        id: version
        run: |
          VERSION=$(git-cliff --bumped-version 2>/dev/null || echo "")
          echo "version=${VERSION}" >> $GITHUB_OUTPUT

      - name: Create tag
        env:
          REPOSITORY: ${{ github.repository }}
          DEFAULT_BRANCH: ${{ github.event.repository.default_branch }}
          VERSION: ${{ steps.version.outputs.version }}
        run: |
          TOKEN=$(cat "${RELEASE_TOKEN_FILE}")
          if [ ! -r .version ]; then
            echo "Version file not found"
            exit 0
          fi

          CURRENT_VERSION=$(cat .version 2>/dev/null | jq -r '.version')
          LATEST=$(git describe --abbrev=0 --tags 2>/dev/null || echo '')

          if [ -n "${LATEST}" ] && [ "${CURRENT_VERSION}" = "${LATEST}" ]; then
            echo "Version ${CURRENT_VERSION} already exists"
            exit 0
          fi

          OWNER=$(echo "${REPOSITORY}" | cut -d'/' -f1)
          REPO=$(echo "${REPOSITORY}" | cut -d'/' -f2)
          API_URL="${GITEA_URL}/api/v1/repos/${OWNER}/${REPO}"

          echo "Creating tag ${VERSION}..."
          curl -sf --retry 3 --retry-delay 2 --retry-connrefused -X POST \
            -H "Authorization: token ${TOKEN}" \
            -H "Content-Type: application/json" \
            --data "$(jq -n \
              --arg tag_name "${VERSION}" \
              --arg target "${DEFAULT_BRANCH}" \
              --arg message "${VERSION}" \
              '{tag_name: $tag_name, target: $target, message: $message}')" \
            "${API_URL}/tags"