package types

import (
	"sync/atomic"

	"git.sr.ht/~rjarry/aerc/logging"
)

var lastId int64 = 1 // access via atomic

type Backend interface {
	Run()
}

type Worker struct {
	Backend  Backend
	Actions  chan WorkerMessage
	Messages chan WorkerMessage

	actionCallbacks  map[int64]func(msg WorkerMessage)
	messageCallbacks map[int64]func(msg WorkerMessage)
}

func NewWorker() *Worker {
	return &Worker{
		Actions:          make(chan WorkerMessage, 50),
		Messages:         make(chan WorkerMessage, 50),
		actionCallbacks:  make(map[int64]func(msg WorkerMessage)),
		messageCallbacks: make(map[int64]func(msg WorkerMessage)),
	}
}

func (worker *Worker) setId(msg WorkerMessage) {
	id := atomic.AddInt64(&lastId, 1)
	msg.setId(id)
}

func (worker *Worker) PostAction(msg WorkerMessage, cb func(msg WorkerMessage)) {
	worker.setId(msg)

	if resp := msg.InResponseTo(); resp != nil {
		logging.Debugf("PostAction %T:%T", msg, resp)
	} else {
		logging.Debugf("PostAction %T", msg)
	}
	worker.Actions <- msg

	if cb != nil {
		worker.actionCallbacks[msg.getId()] = cb
	}
}

func (worker *Worker) PostMessage(msg WorkerMessage,
	cb func(msg WorkerMessage),
) {
	worker.setId(msg)

	if resp := msg.InResponseTo(); resp != nil {
		logging.Debugf("PostMessage %T:%T", msg, resp)
	} else {
		logging.Debugf("PostMessage %T", msg)
	}
	worker.Messages <- msg

	if cb != nil {
		worker.messageCallbacks[msg.getId()] = cb
	}
}

func (worker *Worker) ProcessMessage(msg WorkerMessage) WorkerMessage {
	if resp := msg.InResponseTo(); resp != nil {
		logging.Debugf("ProcessMessage %T(%d):%T(%d)", msg, msg.getId(), resp, resp.getId())
	} else {
		logging.Debugf("ProcessMessage %T(%d)", msg, msg.getId())
	}
	if inResponseTo := msg.InResponseTo(); inResponseTo != nil {
		if f, ok := worker.actionCallbacks[inResponseTo.getId()]; ok {
			f(msg)
			if _, ok := msg.(*Done); ok {
				delete(worker.actionCallbacks, inResponseTo.getId())
			}
		}
	}
	return msg
}

func (worker *Worker) ProcessAction(msg WorkerMessage) WorkerMessage {
	if resp := msg.InResponseTo(); resp != nil {
		logging.Debugf("ProcessAction %T(%d):%T(%d)", msg, msg.getId(), resp, resp.getId())
	} else {
		logging.Debugf("ProcessAction %T(%d)", msg, msg.getId())
	}
	if inResponseTo := msg.InResponseTo(); inResponseTo != nil {
		if f, ok := worker.messageCallbacks[inResponseTo.getId()]; ok {
			f(msg)
			if _, ok := msg.(*Done); ok {
				delete(worker.messageCallbacks, inResponseTo.getId())
			}
		}
	}
	return msg
}