name: "Create Gitea Pull Request"
description: "Creates a pull request on a Gitea repository via the REST API"

inputs:
  gitea_url:
    description: "Base URL of the Gitea instance. Empty uses the current instance."
    required: false
    default: ""
  repository:
    description: "Target repository as owner/repo"
    required: false
    default: ""
  token:
    description: "Gitea token with pull-request write access"
    required: true
  title:
    description: "Pull request title"
    required: true
  body:
    description: "Pull request description"
    required: false
    default: ""
  head:
    description: "Source branch. Same-repo: branch name. Fork: owner:branch"
    required: true
  base:
    description: "Target branch"
    required: false
    default: "main"

outputs:
  number:
    description: "Pull request number"
    value: ${{ steps.create_pr.outputs.number }}
  url:
    description: "API URL of the pull request"
    value: ${{ steps.create_pr.outputs.url }}
  html_url:
    description: "Web URL of the pull request"
    value: ${{ steps.create_pr.outputs.html_url }}

runs:
  using: "composite"
  steps:
    - id: create_pr
      name: Create Pull Request
      shell: bash
      run: |
        set -euo pipefail

        GITEA_URL="${{ inputs.gitea_url }}"
        GITEA_URL="${GITEA_URL:-${{ github.server_url }}}"
        GITEA_URL="${GITEA_URL%/}"
        REPOSITORY="${{ inputs.repository }}"
        REPOSITORY="${REPOSITORY:-${{ github.repository }}}"
        TOKEN="${{ inputs.token }}"
        TITLE="${{ inputs.title }}"
        BODY="${{ inputs.body }}"
        HEAD="${{ inputs.head }}"
        BASE="${{ inputs.base }}"
        BASE="${BASE:-main}"

        PAYLOAD="$(jq -n --arg title "$TITLE" --arg body "$BODY" --arg head "$HEAD" --arg base "$BASE" \
          '{title: $title, body: $body, head: $head, base: $base}')"
        RESPONSE=/tmp/gitea-pr.json

        echo "::notice::Creating pull request ${REPOSITORY}: ${HEAD} -> ${BASE}"

        echo "${GITEA_URL}"
        echo "${REPOSITORY}"

        STATUS="$(
          curl -sS -o "$RESPONSE" -w "%{http_code}" \
            -X POST \
            -H "Authorization: token ${TOKEN}" \
            -H "Content-Type: application/json" \
            --data "$PAYLOAD" \
            "${GITEA_URL}/api/v1/repos/${REPOSITORY}/pulls"
        )"

        if [ "$STATUS" != 201 ]; then
          cat "$RESPONSE"
          echo "::error::create failed with HTTP ${STATUS}"
          exit 1
        fi

        NUMBER="$(jq -r '.number' "$RESPONSE")"
        echo "number=${NUMBER}" >> "$GITHUB_OUTPUT"
        echo "url=$(jq -r '.url' "$RESPONSE")" >> "$GITHUB_OUTPUT"
        echo "html_url=$(jq -r '.html_url' "$RESPONSE")" >> "$GITHUB_OUTPUT"
        echo "::notice::Pull request #${NUMBER}: $(jq -r '.html_url' "$RESPONSE")"