import { proto } from '../../WAProto'
import { Chat, WAMessageKey, WAMessageStatus, WAMessageStubType, WAMessageUpdate } from '../Types'
import { delay, generateMessageID, makeEventBuffer, toNumber, unixTimestampSeconds } from '../Utils'
import logger from '../Utils/logger'
import { randomJid } from './utils'

describe('Event Buffer Tests', () => {

	let ev: ReturnType<typeof makeEventBuffer>
	beforeEach(() => {
		const _logger = logger.child({ })
		_logger.level = 'trace'
		ev = makeEventBuffer(_logger)
	})

	it('should buffer a chat upsert & update event', async() => {
		const chatId = randomJid()

		const chats: Chat[] = []

		ev.on('chats.upsert', c => chats.push(...c))
		ev.on('chats.update', () => fail('should not emit update event'))

		ev.buffer()
		ev.processInBuffer((async() => {
			await delay(100)
			ev.emit('chats.upsert', [{ id: chatId, conversationTimestamp: 123, unreadCount: 1 }])
		})())
		ev.processInBuffer((async() => {
			await delay(200)
			ev.emit('chats.update', [{ id: chatId, conversationTimestamp: 124, unreadCount: 1 }])
		})())

		await ev.flush()

		expect(chats).toHaveLength(1)
		expect(chats[0].conversationTimestamp).toEqual(124)
		expect(chats[0].unreadCount).toEqual(2)
	})

	it('should overwrite a chats.delete event', async() => {
		const chatId = randomJid()
		const chats: Partial<Chat>[] = []

		ev.on('chats.update', c => chats.push(...c))
		ev.on('chats.delete', () => fail('not should have emitted'))

		ev.buffer()

		ev.emit('chats.update', [{ id: chatId, conversationTimestamp: 123, unreadCount: 1 }])
		ev.emit('chats.delete', [chatId])
		ev.emit('chats.update', [{ id: chatId, conversationTimestamp: 124, unreadCount: 1 }])

		await ev.flush()

		expect(chats).toHaveLength(1)
	})

	it('should overwrite a chats.update event', async() => {
		const chatId = randomJid()
		const chatsDeleted: string[] = []

		ev.on('chats.delete', c => chatsDeleted.push(...c))
		ev.on('chats.update', () => fail('not should have emitted'))

		ev.buffer()

		ev.emit('chats.update', [{ id: chatId, conversationTimestamp: 123, unreadCount: 1 }])
		ev.emit('chats.delete', [chatId])

		await ev.flush()

		expect(chatsDeleted).toHaveLength(1)
	})

	it('should release a conditional update at the right time', async() => {
		const chatId = randomJid()
		const chatId2 = randomJid()
		const chatsUpserted: Chat[] = []
		const chatsSynced: Chat[] = []

		ev.on('chats.upsert', c => chatsUpserted.push(...c))
		ev.on('messaging-history.set', c => chatsSynced.push(...c.chats))
		ev.on('chats.update', () => fail('not should have emitted'))

		ev.buffer()
		ev.emit('chats.update', [{
			id: chatId,
			archived: true,
			conditional(buff) {
				if(buff.chatUpserts[chatId]) {
					return true
				}
			}
		}])
		ev.emit('chats.update', [{
			id: chatId2,
			archived: true,
			conditional(buff) {
				if(buff.historySets.chats[chatId2]) {
					return true
				}
			}
		}])

		await ev.flush()

		ev.buffer()
		ev.emit('chats.upsert', [{
			id: chatId,
			conversationTimestamp: 123,
			unreadCount: 1,
			muteEndTime: 123
		}])
		ev.emit('messaging-history.set', {
			chats: [{
				id: chatId2,
				conversationTimestamp: 123,
				unreadCount: 1,
				muteEndTime: 123
			}],
			contacts: [],
			messages: [],
			isLatest: false
		})
		await ev.flush()

		expect(chatsUpserted).toHaveLength(1)
		expect(chatsUpserted[0].id).toEqual(chatId)
		expect(chatsUpserted[0].archived).toEqual(true)
		expect(chatsUpserted[0].muteEndTime).toEqual(123)

		expect(chatsSynced).toHaveLength(1)
		expect(chatsSynced[0].id).toEqual(chatId2)
		expect(chatsSynced[0].archived).toEqual(true)
	})

	it('should discard a conditional update', async() => {
		const chatId = randomJid()
		const chatsUpserted: Chat[] = []

		ev.on('chats.upsert', c => chatsUpserted.push(...c))
		ev.on('chats.update', () => fail('not should have emitted'))

		ev.buffer()
		ev.emit('chats.update', [{
			id: chatId,
			archived: true,
			conditional(buff) {
				if(buff.chatUpserts[chatId]) {
					return false
				}
			}
		}])
		ev.emit('chats.upsert', [{
			id: chatId,
			conversationTimestamp: 123,
			unreadCount: 1,
			muteEndTime: 123
		}])

		await ev.flush()

		expect(chatsUpserted).toHaveLength(1)
		expect(chatsUpserted[0].archived).toBeUndefined()
	})

	it('should overwrite a chats.update event with a history event', async() => {
		const chatId = randomJid()
		let chatRecv: Chat | undefined

		ev.on('messaging-history.set', ({ chats }) => {
			chatRecv = chats[0]
		})
		ev.on('chats.update', () => fail('not should have emitted'))

		ev.buffer()

		ev.emit('messaging-history.set', {
			chats: [{ id: chatId, conversationTimestamp: 123, unreadCount: 1 }],
			messages: [],
			contacts: [],
			isLatest: true
		})
		ev.emit('chats.update', [{ id: chatId, archived: true }])

		await ev.flush()

		expect(chatRecv).toBeDefined()
		expect(chatRecv?.archived).toBeTruthy()
	})

	it('should buffer message upsert events', async() => {
		const messageTimestamp = unixTimestampSeconds()
		const msg: proto.IWebMessageInfo = {
			key: {
				remoteJid: randomJid(),
				id: generateMessageID(),
				fromMe: false
			},
			messageStubType: WAMessageStubType.CIPHERTEXT,
			messageTimestamp
		}

		const msgs: proto.IWebMessageInfo[] = []

		ev.on('messages.upsert', c => {
			msgs.push(...c.messages)
			expect(c.type).toEqual('notify')
		})

		ev.buffer()
		ev.emit('messages.upsert', { messages: [proto.WebMessageInfo.fromObject(msg)], type: 'notify' })

		msg.messageTimestamp = unixTimestampSeconds() + 1
		msg.messageStubType = undefined
		msg.message = { conversation: 'Test' }
		ev.emit('messages.upsert', { messages: [proto.WebMessageInfo.fromObject(msg)], type: 'notify' })
		ev.emit('messages.update', [{ key: msg.key, update: { status: WAMessageStatus.READ } }])

		await ev.flush()

		expect(msgs).toHaveLength(1)
		expect(msgs[0].message).toBeTruthy()
		expect(toNumber(msgs[0].messageTimestamp!)).toEqual(messageTimestamp)
		expect(msgs[0].status).toEqual(WAMessageStatus.READ)
	})

	it('should buffer a message receipt update', async() => {
		const msg: proto.IWebMessageInfo = {
			key: {
				remoteJid: randomJid(),
				id: generateMessageID(),
				fromMe: false
			},
			messageStubType: WAMessageStubType.CIPHERTEXT,
			messageTimestamp: unixTimestampSeconds()
		}

		const msgs: proto.IWebMessageInfo[] = []

		ev.on('messages.upsert', c => msgs.push(...c.messages))
		ev.on('message-receipt.update', () => fail('should not emit'))

		ev.buffer()
		ev.emit('messages.upsert', { messages: [proto.WebMessageInfo.fromObject(msg)], type: 'notify' })
		ev.emit('message-receipt.update', [
			{
				key: msg.key,
				receipt: {
					userJid: randomJid(),
					readTimestamp: unixTimestampSeconds()
				}
			}
		])

		await ev.flush()

		expect(msgs).toHaveLength(1)
		expect(msgs[0].userReceipt).toHaveLength(1)
	})

	it('should buffer multiple status updates', async() => {
		const key: WAMessageKey = {
			remoteJid: randomJid(),
			id: generateMessageID(),
			fromMe: false
		}

		const msgs: WAMessageUpdate[] = []

		ev.on('messages.update', c => msgs.push(...c))

		ev.buffer()
		ev.emit('messages.update', [{ key, update: { status: WAMessageStatus.DELIVERY_ACK } }])
		ev.emit('messages.update', [{ key, update: { status: WAMessageStatus.READ } }])

		await ev.flush()

		expect(msgs).toHaveLength(1)
		expect(msgs[0].update.status).toEqual(WAMessageStatus.READ)
	})

	it('should remove chat unread counter', async() => {
		const msg: proto.IWebMessageInfo = {
			key: {
				remoteJid: '12345@s.whatsapp.net',
				id: generateMessageID(),
				fromMe: false
			},
			message: {
				conversation: 'abcd'
			},
			messageTimestamp: unixTimestampSeconds()
		}

		const chats: Partial<Chat>[] = []

		ev.on('chats.update', c => chats.push(...c))

		ev.buffer()
		ev.emit('messages.upsert', { messages: [proto.WebMessageInfo.fromObject(msg)], type: 'notify' })
		ev.emit('chats.update', [{ id: msg.key.remoteJid!, unreadCount: 1, conversationTimestamp: msg.messageTimestamp }])
		ev.emit('messages.update', [{ key: msg.key, update: { status: WAMessageStatus.READ } }])

		await ev.flush()

		expect(chats[0].unreadCount).toBeUndefined()
	})

	it('should not deadlock', async() => {
		const bufferedCode = ev.createBufferedFunction(
			async() => {

			}
		)
		ev.buffer()

		let resolve: (() => void) | undefined
		const initPromise = new Promise<void>(r => {
			resolve = r
		})
		ev.processInBuffer(initPromise)
		const flushPromise = ev.flush()

		ev.processInBuffer(
			(async() => {
				await initPromise
				await delay(100)
				await bufferedCode()
			})()
		)

		resolve!()

		await flushPromise

		// should resolve
		await ev.flush()
	})
})