import { deepStrictEqual, strictEqual, notStrictEqual } from 'assert'
import rmrf from 'rimraf'
import { copy } from 'fs-extra'
import * as IPFS from 'ipfs-core'
import { KeyStore, Identities } from '../../src/index.js'
import Documents from '../../src/databases/documents.js'
import config from '../config.js'
import testKeysPath from '../fixtures/test-keys-path.js'

const keysPath = './testkeys'

describe('Documents Database', function () {
  let ipfs
  let keystore
  let accessController
  let identities
  let testIdentity1
  let db

  const databaseId = 'documents-AAA'

  before(async () => {
    ipfs = await IPFS.create({ ...config.daemon1, repo: './ipfs1' })

    await copy(testKeysPath, keysPath)
    keystore = await KeyStore({ path: keysPath })
    identities = await Identities({ keystore })
    testIdentity1 = await identities.createIdentity({ id: 'userA' })
  })

  after(async () => {
    if (ipfs) {
      await ipfs.stop()
    }

    if (keystore) {
      await keystore.close()
    }

    await rmrf(keysPath)
    await rmrf('./orbitdb')
    await rmrf('./ipfs1')
  })

  describe('Default index \'_id\'', () => {
    beforeEach(async () => {
      db = await Documents()({ ipfs, identity: testIdentity1, address: databaseId, accessController })
    })

    afterEach(async () => {
      if (db) {
        await db.drop()
        await db.close()
      }
    })

    it('creates a document store', async () => {
      strictEqual(db.address.toString(), databaseId)
      strictEqual(db.type, 'documents')
      strictEqual(db.indexBy, '_id')
    })

    it('gets a document', async () => {
      const key = 'hello world 1'

      const expected = { _id: key, msg: 'writing 1 to db' }

      await db.put(expected)

      const doc = await db.get(key)
      deepStrictEqual(doc.value, expected)
    })

    it('throws an error when putting a document with the wrong key', async () => {
      let err
      const key = 'hello world 1'

      const expected = { wrong_key: key, msg: 'writing 1 to db' }

      try {
        await db.put(expected)
      } catch (e) {
        err = e
      }
      strictEqual(err.message, 'The provided document doesn\'t contain field \'_id\'')
    })

    it('throws an error when getting a document with the wrong key', async () => {
      let err
      const key = 'hello world 1'

      const expected = { wrong_key: key, msg: 'writing 1 to db' }

      try {
        await db.put(expected)
      } catch (e) {
        err = e
      }
      strictEqual(err.message, 'The provided document doesn\'t contain field \'_id\'')
    })

    it('deletes a document', async () => {
      const key = 'hello world 1'

      await db.put({ _id: key, msg: 'writing 1 to db' })
      await db.del(key)

      const doc = await db.get(key)
      strictEqual(doc, undefined)
    })

    it('throws an error when deleting a non-existent document', async () => {
      const key = 'i do not exist'
      let err

      try {
        await db.del(key)
      } catch (e) {
        err = e
      }

      strictEqual(err.message, `No document with key '${key}' in the database`)
    })

    it('queries for a document', async () => {
      const expected = { _id: 'hello world 1', msg: 'writing new 1 to db', views: 10 }

      await db.put({ _id: 'hello world 1', msg: 'writing 1 to db', views: 10 })
      await db.put({ _id: 'hello world 2', msg: 'writing 2 to db', views: 5 })
      await db.put({ _id: 'hello world 3', msg: 'writing 3 to db', views: 12 })
      await db.del('hello world 3')
      await db.put(expected)

      const findFn = (doc) => doc.views > 5

      deepStrictEqual(await db.query(findFn), [expected])
    })

    it('queries for a non-existent document', async () => {
      await db.put({ _id: 'hello world 1', msg: 'writing 1 to db', views: 10 })
      await db.del('hello world 1')

      const findFn = (doc) => doc.views > 5

      deepStrictEqual(await db.query(findFn), [])
    })
  })

  describe('Custom index \'doc\'', () => {
    beforeEach(async () => {
      db = await Documents({ indexBy: 'doc' })({ ipfs, identity: testIdentity1, address: databaseId, accessController })
    })

    afterEach(async () => {
      if (db) {
        await db.drop()
        await db.close()
      }
    })

    it('creates a document store', async () => {
      strictEqual(db.address.toString(), databaseId)
      strictEqual(db.type, 'documents')
      strictEqual(db.indexBy, 'doc')
    })

    it('gets a document', async () => {
      const key = 'hello world 1'

      const expected = { doc: key, msg: 'writing 1 to db' }

      await db.put(expected)

      const doc = await db.get(key)
      deepStrictEqual(doc.value, expected)
    })

    it('deletes a document', async () => {
      const key = 'hello world 1'

      await db.put({ doc: key, msg: 'writing 1 to db' })
      await db.del(key)

      const doc = await db.get(key)
      strictEqual(doc, undefined)
    })
    it('throws an error when putting a document with the wrong key', async () => {
      let err
      const key = 'hello world 1'

      const expected = { _id: key, msg: 'writing 1 to db' }

      try {
        await db.put(expected)
      } catch (e) {
        err = e
      }
      strictEqual(err.message, 'The provided document doesn\'t contain field \'doc\'')
    })

    it('throws an error when getting a document with the wrong key', async () => {
      let err
      const key = 'hello world 1'

      const expected = { _id: key, msg: 'writing 1 to db' }

      try {
        await db.put(expected)
      } catch (e) {
        err = e
      }
      strictEqual(err.message, 'The provided document doesn\'t contain field \'doc\'')
    })

    it('throws an error when deleting a non-existent document', async () => {
      const key = 'i do not exist'
      let err

      try {
        await db.del(key)
      } catch (e) {
        err = e
      }

      strictEqual(err.message, `No document with key '${key}' in the database`)
    })

    it('queries for a document', async () => {
      const expected = { doc: 'hello world 1', msg: 'writing new 1 to db', views: 10 }

      await db.put({ doc: 'hello world 1', msg: 'writing 1 to db', views: 10 })
      await db.put({ doc: 'hello world 2', msg: 'writing 2 to db', views: 5 })
      await db.put({ doc: 'hello world 3', msg: 'writing 3 to db', views: 12 })
      await db.del('hello world 3')
      await db.put(expected)

      const findFn = (doc) => doc.views > 5

      deepStrictEqual(await db.query(findFn), [expected])
    })

    it('queries for a non-existent document', async () => {
      await db.put({ doc: 'hello world 1', msg: 'writing 1 to db', views: 10 })
      await db.del('hello world 1')

      const findFn = (doc) => doc.views > 5

      deepStrictEqual(await db.query(findFn), [])
    })
  })

  describe('Iterator', () => {
    before(async () => {
      db = await Documents()({ ipfs, identity: testIdentity1, address: databaseId, accessController })
    })

    after(async () => {
      if (db) {
        await db.drop()
        await db.close()
      }
    })

    it('has an iterator function', async () => {
      notStrictEqual(db.iterator, undefined)
      strictEqual(typeof db.iterator, 'function')
    })

    it('returns no documents when the database is empty', async () => {
      const all = []
      for await (const doc of db.iterator()) {
        all.unshift(doc)
      }
      strictEqual(all.length, 0)
    })

    it('returns all documents when the database is not empty', async () => {
      await db.put({ _id: 'doc1', something: true })
      await db.put({ _id: 'doc2', something: true })
      await db.put({ _id: 'doc3', something: true })
      await db.put({ _id: 'doc4', something: true })
      await db.put({ _id: 'doc5', something: true })

      // Add one more document and then delete it to count
      // for the fact that the amount returned should be
      // the amount of actual documents returned and not
      // the oplog length, and deleted documents don't
      // count towards the returned amount.
      await db.put({ _id: 'doc6', something: true })
      await db.del('doc6')

      const all = []
      for await (const doc of db.iterator()) {
        all.unshift(doc)
      }
      strictEqual(all.length, 5)
    })

    it('returns only the amount of documents given as a parameter', async () => {
      const amount = 3
      const all = []
      for await (const doc of db.iterator({ amount })) {
        all.unshift(doc)
      }
      strictEqual(all.length, amount)
    })

    it('returns only two documents if amount given as a parameter is 2', async () => {
      const amount = 2
      const all = []
      for await (const doc of db.iterator({ amount })) {
        all.unshift(doc)
      }
      strictEqual(all.length, amount)
    })

    it('returns only one document if amount given as a parameter is 1', async () => {
      const amount = 1
      const all = []
      for await (const doc of db.iterator({ amount })) {
        all.unshift(doc)
      }
      strictEqual(all.length, amount)
    })
  })
})