package cmd

import (
	"fmt"
	"regexp"
	"strings"
	"sync"
	"time"

	tea "github.com/charmbracelet/bubbletea"
)

const (
	playerMaxTitleLength = 30
)

var (
	regexpPosDur = regexp.MustCompile(`AV: (\d+):(\d+):(\d+) \/ (\d+):(\d+):(\d+)`)
)

type playerModel struct {
	// entry          *feedEntry
	// isPlayingVideo bool

	// // video information
	// videoDuration time.Duration
	// videoPosition time.Duration

	// TODO: make this smarter
	// finished entries to send messages about
	currentlyPlaying *feedEntry
	playQueue        []feedEntry

	mpv *MPVPLayer

	sync.RWMutex
}

func (m *playerModel) Init() tea.Cmd {
	m.mpv = NewMPVPlayer()

	return nil
}

func (m *playerModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
	switch msg := msg.(type) {
	case MsgPlayEntry:
		f := feedEntry(msg)
		m.queue(f)
	}

	// send message because it is finished
	// we have a currentlyPlaying entry, but it is no longer playing
	// which means we finished watching it
	var cmds []tea.Cmd
	if m.currentlyPlaying != nil && m.mpv.IsPlaying() == false {
		if videoPercentageWatched(m.mpv.VideoPosition(), m.mpv.VideoDuration()) > 90 {
			t := m.currentlyPlaying.ID
			cmds = append(cmds, func() tea.Msg { return MsgWatchedEntry(t) })
		}

		// unset currentlyPlaying
		m.currentlyPlaying = nil

		if err := m.playNext(); err != nil {
			cmds = append(cmds, func() tea.Msg { return MsgError(err) })
		}
	}

	return m, tea.Batch(cmds...)
}

func (m *playerModel) View() string {
	// return "NO DONT ASK"
	// return fmt.Sprintf("IsPlaying: %v, Pos: %v, Dur: %v, Per: %v", m.mpv.IsPlaying(), m.mpv.VideoPosition(), m.mpv.VideoDuration(), videoPercentageWatched(m.mpv.VideoPosition(), m.mpv.VideoDuration()))

	if m.mpv.IsPlaying() {
		timePos := time.Time{}.Add(m.mpv.VideoPosition())
		timeDur := time.Time{}.Add(m.mpv.VideoDuration())

		// truncate name if needed
		// name := m.entry.Name
		name := m.currentlyPlaying.Name
		name = strings.TrimPrefix(name, "[QUEUE] ")
		if len(name) > playerMaxTitleLength {
			name = name[0:playerMaxTitleLength] + "..."
		}

		return fmt.Sprintf("Playing: %s (%s/%s %.1f%%)",
			name,
			timePos.Format(time.TimeOnly),
			timeDur.Format(time.TimeOnly),
			videoPercentageWatched(m.mpv.VideoPosition(), m.mpv.VideoDuration()),
		)

	}

	return ""
}

// other functions
func (m *playerModel) queue(f feedEntry) error {
	// check if already exists
	// TODO: handle actually showing errros?
	queueIndex := -1
	for i, e := range m.playQueue {
		if e.ID == f.ID {
			queueIndex = i
		}
	}

	if queueIndex >= 0 && len(m.playQueue) > 1 {
		m.playQueue = append([]feedEntry{f}, append(m.playQueue[:queueIndex], m.playQueue[queueIndex+1:]...)...)

	} else {
		m.playQueue = append(m.playQueue, f)
	}

	if len(m.playQueue) == 1 && m.mpv.IsPlaying() == false {
		m.currentlyPlaying = &m.playQueue[0]
		m.playQueue = m.playQueue[1:]
		return m.mpv.Play(VideoID("TODO-remove-this"), m.currentlyPlaying.Link)
	}

	return nil
}

func (m *playerModel) playNext() error {
	if len(m.playQueue) > 0 && m.mpv.IsPlaying() == false {
		m.currentlyPlaying = &m.playQueue[0]
		m.playQueue = m.playQueue[1:]
		return m.mpv.Play(VideoID("TODO-remove-this"), m.currentlyPlaying.Link)
	}

	return nil
}