name: Generate Release Notes

on:
    workflow_dispatch:
        inputs: &note_inputs
            release_ref:
                description: Branch or tag to build from
                required: false
                default: master
                type: string
            version_name:
                required: true
                type: string
    workflow_call:
        inputs: *note_inputs
        outputs:
            release_notes:
                description: Generated release notes
                value: ${{ jobs.Generate.outputs.release_notes }}

jobs:
    Generate:
        outputs:
            release_notes: ${{ steps.notes.outputs.release_notes }}
        runs-on: ubuntu-latest
        env:
            RELEASE_REF: ${{ inputs.release_ref || 'master' }}
        steps:
            - name: Checkout source
              uses: actions/checkout@v4
              with:
                fetch-depth: 0
                ref: ${{ env.RELEASE_REF }}

            - name: Install Dependencies
              run: npm install semver@7

            - name: Generate Release Notes
              id: notes
              uses: actions/github-script@v7
              with:
                github-token: ${{ secrets.GITHUB_TOKEN }}
                script: |
                    const semver = require('semver');
                    const releaseName = 'v${{ inputs.version_name }}';
                    const { owner, repo } = context.repo;

                    const { data: releases } = await github.rest.repos.listReleases({
                        owner,
                        repo,
                        per_page: 100,
                    });

                    const currentVersion = semver.parse('${{ inputs.version_name }}');

                    const previousReleaseTag = releases
                        .filter(r => !r.draft && !r.prerelease)
                        .map(r => r.tag_name)
                        .filter(tag => semver.valid(tag) && semver.lt(tag, currentVersion))
                        .sort(semver.rcompare)[0];

                    const payload = {
                        owner,
                        repo,
                        tag_name: releaseName,
                        target_commitish: '${{ env.RELEASE_REF }}',
                    };

                    if (previousReleaseTag) {
                        payload.previous_tag_name = previousReleaseTag;
                    }

                    const response = await github.request(
                        'POST /repos/{owner}/{repo}/releases/generate-notes',
                        payload
                    );

                    const notes = response.data.body || '';
                    core.exportVariable('RELEASE_NOTES', notes);
                    core.setOutput('release_notes', notes);