package cmd

import (
	"fmt"
	"os"
	"os/exec"
	"sync"
	"time"

	"github.com/dexterlb/mpvipc"
)

type VideoID string

type MPVPLayer struct {
	c *mpvipc.Connection
	f *os.File

	videoID       VideoID
	videoPosition time.Duration
	videoDuration time.Duration
	isPlaying     bool
	finishedVideo string

	sync.RWMutex
}

func NewMPVPlayer() *MPVPLayer {
	return &MPVPLayer{}
}

func (mpv *MPVPLayer) Exit() error {
	return nil
}

func (mpv *MPVPLayer) Play(id VideoID, url string) error {
	if err := mpv.ensurePlayer(); err != nil {
		return err
	}

	mpv.Lock()
	defer mpv.Unlock()

	_, err := mpv.c.Call("loadfile", url)
	if err != nil {
		return err
	}

	mpv.videoID = id
	mpv.isPlaying = true

	if err := mpv.c.Set("pause", false); err != nil {
		return err
	}

	return nil
}

func (mpv *MPVPLayer) Stop() error {
	mpv.Lock()
	defer mpv.Unlock()
	if mpv.c == nil {
		return nil
	}

	err := mpv.c.Set("pause", true)
	return err
}

func (mpv *MPVPLayer) VideoDuration() time.Duration {
	mpv.RLock()
	defer mpv.RUnlock()

	return mpv.videoDuration
}

func (mpv *MPVPLayer) VideoPosition() time.Duration {
	mpv.RLock()
	defer mpv.RUnlock()

	return mpv.videoPosition
}

func (mpv *MPVPLayer) IsPlaying() bool {
	mpv.Lock()
	defer mpv.Unlock()

	if mpv.c != nil && mpv.c.IsClosed() {
		return false
	}

	return mpv.isPlaying
}

// TODO: this fucking sucks, a lot, what the fuck
func (mpv *MPVPLayer) ensurePlayer() error {
	mpv.Lock()
	defer mpv.Unlock()
	if mpv.c != nil && !mpv.c.IsClosed() {
		return nil
	}

	// TODO: cleanup this file
	var err error
	mpv.f, err = os.CreateTemp("", "mpvminiflux")
	if err != nil {
		return err
	}

	// close and delete file
	// defer func() {
	// 	if mpv.f == nil {
	// 		return
	// 	}

	// 	filename := mpv.f.Name()
	// 	mpv.f.Close()
	// 	os.Remove(filename)
	// }()

	// defer mpv.finishedVideo()

	// ctx := context.TODO()
	cmd := exec.Command(
		"mpv",
		"--keep-open=yes",
		"--idle",
		fmt.Sprintf("--input-ipc-server=%s", mpv.f.Name()),
	)

	// start
	err = cmd.Start()
	if err != nil {
		return err
	}

	time.Sleep(100 * time.Millisecond)
	mpv.c = mpvipc.NewConnection(mpv.f.Name())
	if err := mpv.c.Open(); err != nil {
		return err
	}

	// setup observe properties
	events, _ := mpv.c.NewEventListener()
	if _, err = mpv.c.Call("observe_property", 1, "duration"); err != nil {
		return err
	}
	if _, err = mpv.c.Call("observe_property", 2, "time-pos"); err != nil {
		return err
	}
	if _, err = mpv.c.Call("observe_property", 3, "eof-reached"); err != nil {
		return err
	}

	// TODO: this will never close any old ones, so it will keep spawning new ones
	go func() {
		for event := range events {
			if event.ID == 1 {
				if event.Data != nil {
					data := event.Data.(float64)

					if data != 0 {
						mpv.Lock()
						mpv.videoDuration = time.Duration(data) * time.Second
						mpv.Unlock()
					}
				}
			} else if event.ID == 2 {
				if event.Data != nil {
					data := event.Data.(float64)

					if data != 0 {
						mpv.Lock()
						mpv.videoPosition = time.Duration(data) * time.Second
						mpv.Unlock()
					}
				}
			} else if event.ID == 3 {
				if event.Data != nil && event.Data.(bool) == true {
					mpv.Lock()
					mpv.isPlaying = false
					mpv.Unlock()
				}
				// TODO: this might not fire once the media ends
				// if event.Data != nil {
				// 	if event.Data.(bool) == true {
				// 		mpv.Lock()
				// 		mpv.finishedVideo()
				// 		mpv.Unlock()
				// 	}
				// }
			}
		}
	}()

	return nil
}