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.Lock()
	defer mpv.Unlock()

	if mpv.c != nil {
		data, _ := mpv.c.Get("duration")
		if data != nil {
			data_s := data.(float64)
			if data_s != 0 {
				mpv.videoDuration = time.Duration(data_s) * time.Second
			}
		}
	}

	return mpv.videoDuration
}

func (mpv *MPVPLayer) VideoPosition() time.Duration {
	mpv.Lock()
	defer mpv.Unlock()

	if mpv.c != nil {
		data, _ := mpv.c.Get("time-pos")
		if data != nil {
			data_s := data.(float64)
			if data_s != 0 {
				mpv.videoPosition = time.Duration(data_s) * time.Second
			}
		}
	}

	return mpv.videoPosition
}

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

	if mpv.c == nil {
		return false
	}

	// closed
	if mpv.c.IsClosed() {
		return false
	}

	// eof
	data, _ := mpv.c.Get("eof-reached")
	if data != nil && data.(bool) == true {
		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.Create(fmt.Sprintf("%s/%s", os.TempDir(), "mpvminiflux")) # no such device or address, etc. errors
	mpv.f, err = os.CreateTemp("", "mpvminiflux")
	if err != nil {
		return err
	}

	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
	}

	// try 10 times to open connection
	// return error otherwise
	for i := 0; i < 10; i++ {
		time.Sleep(10 * time.Millisecond)

		mpv.c = mpvipc.NewConnection(mpv.f.Name())
		err = mpv.c.Open()
		if err == nil {
			break
		}
	}
	if err != nil {
		return err
	}

	return nil
}