import {Commit} from '../lib/git-command-manager'

describe('create-pull-request PR title and body defaulting', () => {
  const defaultTitle = 'Changes by create-pull-request action'
  const defaultBody =
    'Automated changes by [create-pull-request](https://github.com/peter-evans/create-pull-request) GitHub action'

  test('should use commit subject as title for single commit when title is default', () => {
    const commit: Commit = {
      sha: 'abc123',
      tree: 'tree123',
      parents: ['parent123'],
      signed: false,
      subject: 'Update AGP sources to the latest',
      body: '_Auto-generated by `dump-sources` Github workflow._',
      changes: [],
      unparsedChanges: []
    }

    const branchCommits = [commit]
    let title = defaultTitle
    let body = defaultBody

    // Simulate the logic from create-pull-request.ts
    if (branchCommits.length === 1) {
      const singleCommit = branchCommits[0]
      if (title === defaultTitle) {
        title = singleCommit.subject
      }
      if (body === defaultBody) {
        if (singleCommit.body && singleCommit.body.trim().length > 0) {
          body = singleCommit.body
        }
      }
    }

    expect(title).toEqual('Update AGP sources to the latest')
    expect(body).toEqual('_Auto-generated by `dump-sources` Github workflow._')
  })

  test('should not override custom title and body', () => {
    const commit: Commit = {
      sha: 'abc123',
      tree: 'tree123',
      parents: ['parent123'],
      signed: false,
      subject: 'Update AGP sources to the latest',
      body: '_Auto-generated by `dump-sources` Github workflow._',
      changes: [],
      unparsedChanges: []
    }

    const branchCommits = [commit]
    let title = 'Custom Title'
    let body = 'Custom Body'

    // Simulate the logic from create-pull-request.ts
    if (branchCommits.length === 1) {
      const singleCommit = branchCommits[0]
      if (title === defaultTitle) {
        title = singleCommit.subject
      }
      if (body === defaultBody) {
        if (singleCommit.body && singleCommit.body.trim().length > 0) {
          body = singleCommit.body
        }
      }
    }

    expect(title).toEqual('Custom Title')
    expect(body).toEqual('Custom Body')
  })

  test('should not default for multiple commits', () => {
    const commit1: Commit = {
      sha: 'abc123',
      tree: 'tree123',
      parents: ['parent123'],
      signed: false,
      subject: 'First commit',
      body: 'First commit body',
      changes: [],
      unparsedChanges: []
    }

    const commit2: Commit = {
      sha: 'def456',
      tree: 'tree456',
      parents: ['abc123'],
      signed: false,
      subject: 'Second commit',
      body: 'Second commit body',
      changes: [],
      unparsedChanges: []
    }

    const branchCommits = [commit1, commit2]
    let title = defaultTitle
    let body = defaultBody

    // Simulate the logic from create-pull-request.ts
    if (branchCommits.length === 1) {
      const singleCommit = branchCommits[0]
      if (title === defaultTitle) {
        title = singleCommit.subject
      }
      if (body === defaultBody) {
        if (singleCommit.body && singleCommit.body.trim().length > 0) {
          body = singleCommit.body
        }
      }
    }

    expect(title).toEqual(defaultTitle)
    expect(body).toEqual(defaultBody)
  })

  test('should handle commit with empty body', () => {
    const commit: Commit = {
      sha: 'abc123',
      tree: 'tree123',
      parents: ['parent123'],
      signed: false,
      subject: 'Update files',
      body: '',
      changes: [],
      unparsedChanges: []
    }

    const branchCommits = [commit]
    let title = defaultTitle
    let body = defaultBody

    // Simulate the logic from create-pull-request.ts
    if (branchCommits.length === 1) {
      const singleCommit = branchCommits[0]
      if (title === defaultTitle) {
        title = singleCommit.subject
      }
      if (body === defaultBody) {
        if (singleCommit.body && singleCommit.body.trim().length > 0) {
          body = singleCommit.body
        }
      }
    }

    expect(title).toEqual('Update files')
    expect(body).toEqual(defaultBody) // Should keep default when commit body is empty
  })

  test('should handle commit with multi-line body', () => {
    const commit: Commit = {
      sha: 'abc123',
      tree: 'tree123',
      parents: ['parent123'],
      signed: false,
      subject: 'Update documentation',
      body: 'This is a detailed commit message.\n\nIt has multiple paragraphs.\n\n- Item 1\n- Item 2',
      changes: [],
      unparsedChanges: []
    }

    const branchCommits = [commit]
    let title = defaultTitle
    let body = defaultBody

    // Simulate the logic from create-pull-request.ts
    if (branchCommits.length === 1) {
      const singleCommit = branchCommits[0]
      if (title === defaultTitle) {
        title = singleCommit.subject
      }
      if (body === defaultBody) {
        if (singleCommit.body && singleCommit.body.trim().length > 0) {
          body = singleCommit.body
        }
      }
    }

    expect(title).toEqual('Update documentation')
    expect(body).toEqual(
      'This is a detailed commit message.\n\nIt has multiple paragraphs.\n\n- Item 1\n- Item 2'
    )
  })

  test('should handle commit with whitespace-only body', () => {
    const commit: Commit = {
      sha: 'abc123',
      tree: 'tree123',
      parents: ['parent123'],
      signed: false,
      subject: 'Update files',
      body: '   \n\n   ',
      changes: [],
      unparsedChanges: []
    }

    const branchCommits = [commit]
    let title = defaultTitle
    let body = defaultBody

    // Simulate the logic from create-pull-request.ts
    if (branchCommits.length === 1) {
      const singleCommit = branchCommits[0]
      if (title === defaultTitle) {
        title = singleCommit.subject
      }
      if (body === defaultBody) {
        if (singleCommit.body && singleCommit.body.trim().length > 0) {
          body = singleCommit.body
        }
      }
    }

    expect(title).toEqual('Update files')
    expect(body).toEqual(defaultBody) // Should keep default when commit body is only whitespace
  })
})