import { expect } from 'chai'
import crypto from 'node:crypto'
import mongodb from 'mongodb-legacy'
import nock from 'nock'
import * as ProjectHistoryClient from './helpers/ProjectHistoryClient.js'
import * as ProjectHistoryApp from './helpers/ProjectHistoryApp.js'
const { ObjectId } = mongodb

const MockHistoryStore = () => nock('http://127.0.0.1:3100')
const MockWeb = () => nock('http://127.0.0.1:3000')

const sha = data => crypto.createHash('sha1').update(data).digest('hex')

describe('FileTree Diffs', function () {
  beforeEach(async function () {
    await ProjectHistoryApp.ensureRunning()

    this.historyId = new ObjectId().toString()
    this.projectId = new ObjectId().toString()

    MockHistoryStore().post('/api/projects').reply(200, {
      projectId: this.historyId,
    })
    MockWeb()
      .get(`/project/${this.projectId}/details`)
      .reply(200, {
        name: 'Test Project',
        overleaf: { history: { id: this.historyId } },
      })

    await ProjectHistoryClient.initializeProject(this.historyId)
  })

  afterEach(function () {
    return nock.cleanAll()
  })

  it('should return a diff of the updates to a doc from a single chunk', async function () {
    MockHistoryStore()
      .get(`/api/projects/${this.historyId}/versions/7/history`)
      .reply(200, {
        chunk: {
          history: {
            snapshot: {
              files: {
                'foo.tex': {
                  hash: sha('mock-sha-foo'),
                  stringLength: 42,
                },
                'renamed.tex': {
                  hash: sha('mock-sha-renamed'),
                  stringLength: 42,
                },
                'deleted.tex': {
                  hash: sha('mock-sha-deleted'),
                  stringLength: 42,
                },
              },
            },
            changes: [
              {
                operations: [
                  {
                    pathname: 'renamed.tex',
                    newPathname: 'newName.tex',
                  },
                ],
                timestamp: '2017-12-04T10:29:17.786Z',
                authors: [31],
              },
              {
                operations: [
                  {
                    pathname: 'foo.tex',
                    textOperation: ['lorem ipsum'],
                  },
                ],
                timestamp: '2017-12-04T10:29:17.786Z',
                authors: [31],
              },
              {
                operations: [
                  {
                    pathname: 'deleted.tex',
                    newPathname: '',
                  },
                ],
                timestamp: '2017-12-04T10:29:22.905Z',
                authors: [31],
              },
              {
                operations: [
                  {
                    file: {
                      hash: sha('new-sha'),
                      stringLength: 42,
                    },
                    pathname: 'added.tex',
                  },
                ],
                timestamp: '2017-12-04T10:29:22.905Z',
                authors: [31],
              },
            ],
          },
          startVersion: 3,
        },
        authors: [{ id: 31, email: 'james.allen@overleaf.com', name: 'James' }],
      })

    const { diff } = await ProjectHistoryClient.getFileTreeDiff(
      this.projectId,
      3,
      7
    )
    expect(diff).to.deep.equal({
      diff: [
        {
          pathname: 'foo.tex',
          operation: 'edited',
        },
        {
          pathname: 'deleted.tex',
          operation: 'removed',
          deletedAtV: 5,
          editable: true,
        },
        {
          newPathname: 'newName.tex',
          pathname: 'renamed.tex',
          operation: 'renamed',
          editable: true,
        },
        {
          pathname: 'added.tex',
          operation: 'added',
          editable: true,
        },
      ],
    })
  })

  it('should return a diff of the updates to a doc across multiple chunks', async function () {
    MockHistoryStore()
      .get(`/api/projects/${this.historyId}/versions/5/history`)
      .reply(200, {
        chunk: {
          history: {
            snapshot: {
              files: {
                'foo.tex': {
                  // Updated in this chunk
                  hash: sha('mock-sha-foo'),
                  stringLength: 42,
                },
                'bar.tex': {
                  // Updated in the next chunk
                  hash: sha('mock-sha-bar'),
                  stringLength: 42,
                },
                'baz.tex': {
                  // Not updated
                  hash: sha('mock-sha-bar'),
                  stringLength: 42,
                },
                'renamed.tex': {
                  hash: sha('mock-sha-renamed'),
                  stringLength: 42,
                },
                'deleted.tex': {
                  hash: sha('mock-sha-deleted'),
                  stringLength: 42,
                },
              },
            },
            changes: [
              {
                operations: [
                  {
                    pathname: 'renamed.tex',
                    newPathname: 'newName.tex',
                  },
                ],
                timestamp: '2017-12-04T10:29:17.786Z',
                authors: [31],
              },
              {
                operations: [
                  {
                    pathname: 'foo.tex',
                    textOperation: ['lorem ipsum'],
                  },
                ],
                timestamp: '2017-12-04T10:29:19.786Z',
                authors: [31],
              },
              {
                operations: [
                  {
                    pathname: 'deleted.tex',
                    newPathname: '',
                  },
                ],
                timestamp: '2017-12-04T10:29:22.905Z',
                authors: [31],
              },
            ],
          },
          startVersion: 2,
        },
        authors: [{ id: 31, email: 'james.allen@overleaf.com', name: 'James' }],
      })
    MockHistoryStore()
      .get(`/api/projects/${this.historyId}/versions/7/history`)
      .reply(200, {
        chunk: {
          history: {
            snapshot: {
              files: {
                'foo.tex': {
                  hash: sha('mock-sha-foo'),
                  stringLength: 42,
                },
                'baz.tex': {
                  hash: sha('mock-sha-bar'),
                  stringLength: 42,
                },
                'newName.tex': {
                  hash: sha('mock-sha-renamed'),
                  stringLength: 42,
                },
              },
            },
            changes: [
              {
                operations: [
                  {
                    file: {
                      hash: sha('new-sha'),
                      stringLength: 42,
                    },
                    pathname: 'added.tex',
                  },
                ],
                timestamp: '2017-12-04T10:29:22.905Z',
                authors: [31],
              },
              {
                operations: [
                  {
                    pathname: 'bar.tex',
                    textOperation: ['lorem ipsum'],
                  },
                ],
                timestamp: '2017-12-04T10:29:23.786Z',
                authors: [31],
              },
            ],
          },
          startVersion: 5,
        },
        authors: [{ id: 31, email: 'james.allen@overleaf.com', name: 'James' }],
      })

    const { diff } = await ProjectHistoryClient.getFileTreeDiff(
      this.projectId,
      2,
      7
    )
    expect(diff).to.deep.equal({
      diff: [
        {
          pathname: 'foo.tex',
          operation: 'edited',
        },
        {
          pathname: 'bar.tex',
          operation: 'edited',
        },
        {
          pathname: 'baz.tex',
          editable: true,
        },
        {
          pathname: 'deleted.tex',
          operation: 'removed',
          deletedAtV: 4,
          editable: true,
        },
        {
          newPathname: 'newName.tex',
          pathname: 'renamed.tex',
          operation: 'renamed',
          editable: true,
        },
        {
          pathname: 'added.tex',
          operation: 'added',
          editable: true,
        },
      ],
    })
  })

  it('should return a diff that includes multiple renames', async function () {
    MockHistoryStore()
      .get(`/api/projects/${this.historyId}/versions/5/history`)
      .reply(200, {
        chunk: {
          history: {
            snapshot: {
              files: {
                'one.tex': {
                  hash: sha('mock-sha'),
                  stringLength: 42,
                },
              },
            },
            changes: [
              {
                operations: [
                  {
                    pathname: 'one.tex',
                    newPathname: 'two.tex',
                  },
                ],
                timestamp: '2017-12-04T10:29:17.786Z',
                authors: [31],
              },
              {
                operations: [
                  {
                    pathname: 'two.tex',
                    newPathname: 'three.tex',
                  },
                ],
                timestamp: '2017-12-04T10:29:22.905Z',
                authors: [31],
              },
            ],
          },
          startVersion: 3,
        },
        authors: [{ id: 31, email: 'james.allen@overleaf.com', name: 'James' }],
      })

    const { diff } = await ProjectHistoryClient.getFileTreeDiff(
      this.projectId,
      3,
      5
    )
    expect(diff).to.deep.equal({
      diff: [
        {
          newPathname: 'three.tex',
          pathname: 'one.tex',
          operation: 'renamed',
          editable: true,
        },
      ],
    })
  })

  it('should handle deleting then re-adding a file', async function () {
    MockHistoryStore()
      .get(`/api/projects/${this.historyId}/versions/5/history`)
      .reply(200, {
        chunk: {
          history: {
            snapshot: {
              files: {
                'one.tex': {
                  hash: sha('mock-sha'),
                  stringLength: 42,
                },
              },
            },
            changes: [
              {
                operations: [
                  {
                    pathname: 'one.tex',
                    newPathname: '',
                  },
                ],
                timestamp: '2017-12-04T10:29:17.786Z',
                authors: [31],
              },
              {
                operations: [
                  {
                    pathname: 'one.tex',
                    file: {
                      hash: sha('mock-sha'),
                    },
                  },
                ],
                timestamp: '2017-12-04T10:29:22.905Z',
                authors: [31],
              },
            ],
          },
          startVersion: 3,
        },
        authors: [{ id: 31, email: 'james.allen@overleaf.com', name: 'James' }],
      })

    const { diff } = await ProjectHistoryClient.getFileTreeDiff(
      this.projectId,
      3,
      5
    )
    expect(diff).to.deep.equal({
      diff: [
        {
          pathname: 'one.tex',
          operation: 'added',
          editable: null,
        },
      ],
    })
  })

  it('should handle deleting the renaming a file to the same place', async function () {
    MockHistoryStore()
      .get(`/api/projects/${this.historyId}/versions/5/history`)
      .reply(200, {
        chunk: {
          history: {
            snapshot: {
              files: {
                'one.tex': {
                  hash: sha('mock-sha-one'),
                  stringLength: 42,
                },
                'two.tex': {
                  hash: sha('mock-sha-two'),
                  stringLength: 42,
                },
              },
            },
            changes: [
              {
                operations: [
                  {
                    pathname: 'one.tex',
                    newPathname: '',
                  },
                ],
                timestamp: '2017-12-04T10:29:17.786Z',
                authors: [31],
              },
              {
                operations: [
                  {
                    pathname: 'two.tex',
                    newPathname: 'one.tex',
                  },
                ],
                timestamp: '2017-12-04T10:29:22.905Z',
                authors: [31],
              },
            ],
          },
          startVersion: 3,
        },
        authors: [{ id: 31, email: 'james.allen@overleaf.com', name: 'James' }],
      })

    const { diff } = await ProjectHistoryClient.getFileTreeDiff(
      this.projectId,
      3,
      5
    )
    expect(diff).to.deep.equal({
      diff: [
        {
          pathname: 'two.tex',
          newPathname: 'one.tex',
          operation: 'renamed',
          editable: true,
        },
      ],
    })
  })

  it('should handle adding then renaming a file', async function () {
    MockHistoryStore()
      .get(`/api/projects/${this.historyId}/versions/5/history`)
      .reply(200, {
        chunk: {
          history: {
            snapshot: {
              files: {},
            },
            changes: [
              {
                operations: [
                  {
                    pathname: 'one.tex',
                    file: {
                      hash: sha('mock-sha'),
                      stringLength: 42,
                    },
                  },
                ],
                timestamp: '2017-12-04T10:29:17.786Z',
                authors: [31],
              },
              {
                operations: [
                  {
                    pathname: 'one.tex',
                    newPathname: 'two.tex',
                  },
                ],
                timestamp: '2017-12-04T10:29:22.905Z',
                authors: [31],
              },
            ],
          },
          startVersion: 3,
        },
        authors: [{ id: 31, email: 'james.allen@overleaf.com', name: 'James' }],
      })

    const { diff } = await ProjectHistoryClient.getFileTreeDiff(
      this.projectId,
      3,
      5
    )
    expect(diff).to.deep.equal({
      diff: [
        {
          pathname: 'two.tex',
          operation: 'added',
          editable: true,
        },
      ],
    })
  })

  it('should return 422 with a chunk with an invalid rename', async function () {
    MockHistoryStore()
      .get(`/api/projects/${this.historyId}/versions/6/history`)
      .reply(200, {
        chunk: {
          history: {
            snapshot: {
              files: {
                'foo.tex': {
                  hash: sha('mock-sha-foo'),
                  stringLength: 42,
                },
                'bar.tex': {
                  hash: sha('mock-sha-bar'),
                  stringLength: 42,
                },
              },
            },
            changes: [
              {
                operations: [
                  {
                    pathname: 'foo.tex',
                    newPathname: 'bar.tex',
                  },
                ],
                timestamp: '2017-12-04T10:29:17.786Z',
                authors: [31],
              },
            ],
          },
          startVersion: 5,
        },
        authors: [{ id: 31, email: 'james.allen@overleaf.com', name: 'James' }],
      })

    const { statusCode } = await ProjectHistoryClient.getFileTreeDiff(
      this.projectId,
      5,
      6
    )
    expect(statusCode).to.equal(422)
  })

  it('should return 200 with a chunk with an invalid add', async function () {
    MockHistoryStore()
      .get(`/api/projects/${this.historyId}/versions/6/history`)
      .reply(200, {
        chunk: {
          history: {
            snapshot: {
              files: {
                'foo.tex': {
                  hash: sha('mock-sha-foo'),
                  stringLength: 42,
                },
              },
            },
            changes: [
              {
                operations: [
                  {
                    file: {
                      hash: sha('new-sha'),
                    },
                    pathname: 'foo.tex',
                  },
                ],
                timestamp: '2017-12-04T10:29:17.786Z',
                authors: [31],
              },
            ],
          },
          startVersion: 5,
        },
        authors: [{ id: 31, email: 'james.allen@overleaf.com', name: 'James' }],
      })

    const { diff, statusCode } = await ProjectHistoryClient.getFileTreeDiff(
      this.projectId,
      5,
      6
    )
    expect(diff).to.deep.equal({
      diff: [
        {
          pathname: 'foo.tex',
          operation: 'added',
          editable: null,
        },
      ],
    })
    expect(statusCode).to.equal(200)
  })

  it('should handle edits of missing/invalid files ', async function () {
    MockHistoryStore()
      .get(`/api/projects/${this.historyId}/versions/5/history`)
      .reply(200, {
        chunk: {
          history: {
            snapshot: {
              files: {},
            },
            changes: [
              {
                operations: [
                  {
                    pathname: 'new.tex',
                    textOperation: ['lorem ipsum'],
                  },
                ],
                timestamp: '2017-12-04T10:29:18.786Z',
                authors: [31],
              },
              {
                operations: [
                  {
                    pathname: '',
                    textOperation: ['lorem ipsum'],
                  },
                ],
                timestamp: '2017-12-04T10:29:17.786Z',
                authors: [31],
              },
            ],
          },
          startVersion: 3,
        },
        authors: [{ id: 31, email: 'james.allen@overleaf.com', name: 'James' }],
      })

    const { diff } = await ProjectHistoryClient.getFileTreeDiff(
      this.projectId,
      3,
      5
    )
    expect(diff).to.deep.equal({
      diff: [
        {
          operation: 'edited',
          pathname: 'new.tex',
        },
      ],
    })
  })

  it('should handle deletions of missing/invalid files ', async function () {
    MockHistoryStore()
      .get(`/api/projects/${this.historyId}/versions/5/history`)
      .reply(200, {
        chunk: {
          history: {
            snapshot: {
              files: {},
            },
            changes: [
              {
                operations: [
                  {
                    pathname: 'missing.tex',
                    newPathname: '',
                  },
                ],
                timestamp: '2017-12-04T10:29:17.786Z',
                authors: [31],
              },
              {
                operations: [
                  {
                    pathname: '',
                    newPathname: '',
                  },
                ],
                timestamp: '2017-12-04T10:29:17.786Z',
                authors: [31],
              },
            ],
          },
          startVersion: 3,
        },
        authors: [{ id: 31, email: 'james.allen@overleaf.com', name: 'James' }],
      })

    const { diff } = await ProjectHistoryClient.getFileTreeDiff(
      this.projectId,
      3,
      5
    )
    expect(diff).to.deep.equal({
      diff: [],
    })
  })

  return it('should handle renames of missing/invalid files ', async function () {
    MockHistoryStore()
      .get(`/api/projects/${this.historyId}/versions/5/history`)
      .reply(200, {
        chunk: {
          history: {
            snapshot: {
              files: {},
            },
            changes: [
              {
                operations: [
                  {
                    pathname: 'missing.tex',
                    newPathname: 'missing-renamed.tex',
                  },
                ],
                timestamp: '2017-12-04T10:29:17.786Z',
                authors: [31],
              },
              {
                operations: [
                  {
                    pathname: '',
                    newPathname: 'missing-renamed-other.tex',
                  },
                ],
                timestamp: '2017-12-04T10:29:17.786Z',
                authors: [31],
              },
            ],
          },
          startVersion: 3,
        },
        authors: [{ id: 31, email: 'james.allen@overleaf.com', name: 'James' }],
      })

    const { diff } = await ProjectHistoryClient.getFileTreeDiff(
      this.projectId,
      3,
      5
    )
    expect(diff).to.deep.equal({
      diff: [],
    })
  })
})