import { strictEqual, deepStrictEqual } from 'assert'
import rimraf from 'rimraf'
import { copy } from 'fs-extra'
import { Log } from '../../src/oplog/index.js'
import MemoryStorage from '../../src/storage/memory.js'
import { Identities } from '../../src/identities/index.js'
import KeyStore from '../../src/key-store.js'

// Test utils
import { config, testAPIs } from 'orbit-db-test-utils'

const { createIdentity } = Identities
const { sync: rmrf } = rimraf

let testIdentity

Object.keys(testAPIs).forEach((IPFS) => {
  describe('Log - Append (' + IPFS + ')', function () {
    this.timeout(config.timeout)

    const { identityKeyFixtures, signingKeyFixtures, identityKeysPath } = config

    let keystore
    let identities

    before(async () => {
      rmrf(identityKeysPath)
      await copy(identityKeyFixtures, identityKeysPath)
      await copy(signingKeyFixtures, identityKeysPath)

      keystore = new KeyStore(identityKeysPath)

      const storage = await MemoryStorage()

      identities = await Identities({ keystore, storage })
      testIdentity = await identities.createIdentity({ id: 'userA' })
    })

    after(async () => {
      await keystore.close()
      rmrf(identityKeysPath)
    })

    describe('append', async () => {
      describe('append one', async () => {
        let log
        let values = []
        let heads = []

        before(async () => {
          log = await Log(testIdentity, { logId: 'A' })
          await log.append('hello1')
          values = await log.values()
          heads = await log.heads()
        })

        it('added the correct amount of items', () => {
          strictEqual(values.length, 1)
        })

        it('added the correct values', async () => {
          values.forEach((entry) => {
            strictEqual(entry.payload, 'hello1')
          })
        })

        it('added the correct amount of next pointers', async () => {
          values.forEach((entry) => {
            strictEqual(entry.next.length, 0)
          })
        })

        it('has the correct heads', async () => {
          heads.forEach((head) => {
            strictEqual(head.hash, values[0].hash)
          })
        })

        it('updated the clocks correctly', async () => {
          values.forEach((entry) => {
            strictEqual(entry.clock.id, testIdentity.publicKey)
            strictEqual(entry.clock.time, 1)
          })
        })
      })

      describe('append 100 items to a log', async () => {
        const amount = 100
        const nextPointerAmount = 64

        let log
        let values = []
        let heads = []

        before(async () => {
          log = await Log(testIdentity, { logId: 'A' })
          for (let i = 0; i < amount; i++) {
            await log.append('hello' + i, { pointerCount: nextPointerAmount })
          }
          values = await log.values()
          heads = await log.heads()
        })

        it('set the correct heads', () => {
          strictEqual(heads.length, 1)
          deepStrictEqual(heads[0], values[values.length - 1])
        })

        it('added the correct amount of items', () => {
          strictEqual(values.length, amount)
        })

        it('added the correct values', async () => {
          values.forEach((entry, index) => {
            strictEqual(entry.payload, 'hello' + index)
          })
        })

        it('updated the clocks correctly', async () => {
          values.forEach((entry, index) => {
            strictEqual(entry.clock.time, index + 1)
            strictEqual(entry.clock.id, testIdentity.publicKey)
          })
        })

        it('added the correct amount of refs pointers', async () => {
          values.forEach((entry, index) => {
            strictEqual(entry.refs.length, index > 0 ? Math.floor(Math.log2(Math.min(nextPointerAmount, index))) : 0)
          })
        })
      })
    })
  })
})