package main

import (
	"fmt"
	"log"
	"os"
	"path/filepath"
	"strings"

	"github.com/charmbracelet/bubbles/progress"
	"github.com/charmbracelet/bubbles/spinner"
	tea "github.com/charmbracelet/bubbletea"
	"github.com/charmbracelet/lipgloss"
	"github.com/gabriel-vasile/mimetype"
)

var checkmark = lipgloss.NewStyle().Foreground(lipgloss.Color("#22FF33")).Render("✔")

type model struct {
	IsDirectory           bool
	Path                  string
	CurrentFileName       string
	FileCount             int
	Files                 []string
	Spinner               spinner.Model
	SingleFileProgressBar progress.Model
	SingleFileProgress    float64
	TotalProgressBar      progress.Model
	TotalProgress         float64
	Program               *tea.Program
	Quitting              bool
}

func initialModel(fileInfo os.FileInfo, absolutePath string) *model {
	s := spinner.New()
	s.Spinner = spinner.Dot
	s.Style = lipgloss.NewStyle().Foreground(lipgloss.Color("205"))

	return &model{
		IsDirectory:           fileInfo.IsDir(),
		CurrentFileName:       fileInfo.Name(),
		Path:                  absolutePath,
		FileCount:             0,
		Files:                 make([]string, 0),
		Spinner:               s,
		SingleFileProgressBar: progress.New(progress.WithGradient("#1010ff", "#00ff00")),
		SingleFileProgress:    0.0,
		TotalProgressBar:      progress.New(progress.WithDefaultGradient()),
		TotalProgress:         0.0,
		Quitting:              false,
	}
}

func (m model) Init() tea.Cmd {
	return tea.Batch(m.Spinner.Tick, m.statFile)
}

func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
	var cmd tea.Cmd

	switch msg := msg.(type) {
	case tea.KeyMsg:
		switch msg.String() {
		case "ctrl+c":
			return m, tea.Quit
		}
	case initUi:
		m.FileCount = msg.fileCount
		m.Files = msg.files

		return m, encodeVideo
	case encodeVideoMsg:
		m.CurrentFileName = filepath.Base(m.Files[len(m.Files)-1])

		go func() {
			fullFilePath := m.Files[len(m.Files)-1]
			encode(fullFilePath, filepath.Base(fullFilePath), m.Program)
		}()

		return m, nil
	case finishedEncodingVideo:
		m.Files = m.Files[:len(m.Files)-1]

		if len(m.Files) == 0 {
			return m, m.gracefullyQuit
		}

		return m, encodeVideo
	case updateProgress:
		m.SingleFileProgress = msg.progress
		m.TotalProgress = (1.0/float64(m.FileCount))*msg.progress + (1.0 / float64(m.FileCount) * float64(m.FileCount-len(m.Files)))

		singleProgressCmd := m.SingleFileProgressBar.SetPercent(msg.progress)
		totalProgressCmd := m.TotalProgressBar.SetPercent(m.TotalProgress)

		return m, tea.Batch(singleProgressCmd, totalProgressCmd)
	case quitMsg:
		m.Quitting = true
		return m, tea.Quit
	case progress.FrameMsg:
		singleProgressModel, singleProgressCmd := m.SingleFileProgressBar.Update(msg)
		m.SingleFileProgressBar = singleProgressModel.(progress.Model)

		totalProgressModel, totalProgressCmd := m.TotalProgressBar.Update(msg)
		m.TotalProgressBar = totalProgressModel.(progress.Model)

		return m, tea.Batch(singleProgressCmd, totalProgressCmd)
	}

	m.Spinner, cmd = m.Spinner.Update(msg)

	return m, cmd
}

func (m model) View() string {
	if m.Quitting {
		return fmt.Sprintf("%s %d/%d files encoded\n", checkmark, m.FileCount-len(m.Files), m.FileCount)
	}

	progress := ""

	if m.IsDirectory {
		progress = fmt.Sprintf("%s %d/%d files encoded\nFile Progress: %s\n\nTotal Progress: %s", m.Spinner.View(), m.FileCount-len(m.Files), m.FileCount, m.SingleFileProgressBar.View(), m.TotalProgressBar.View())
	} else {
		progress = fmt.Sprintf("%s %d/%d files encoded\n%s", m.Spinner.View(), m.FileCount-len(m.Files), m.FileCount, m.SingleFileProgressBar.View())
	}

	view := fmt.Sprintf("\nEncoding \"%s\"...\n%s", m.CurrentFileName, progress)

	return view
}

type initUi struct {
	fileCount int
	files     []string
}

func (m *model) statFile() tea.Msg {
	if m.IsDirectory {
		entries, _ := os.ReadDir(m.Path)
		for _, entry := range entries {
			fullFilePath := filepath.Join(m.Path, entry.Name())

			if entry.IsDir() {
				continue
			}

			mType, err := mimetype.DetectFile(fullFilePath)
			if err != nil {
				log.Fatal(err)
			}

			if !strings.HasPrefix(mType.String(), "video/") {
				continue
			}

			m.FileCount++
			m.Files = append(m.Files, fullFilePath)
		}
	} else {
		m.FileCount = 1
		m.Files = append(m.Files, m.Path)
	}

	return initUi{
		fileCount: m.FileCount,
		files:     m.Files,
	}
}

type encodeVideoMsg struct{}
type finishedEncodingVideo struct{}
type updateProgress struct {
	progress float64
}
type quitMsg struct{}

func encodeVideo() tea.Msg {
	return encodeVideoMsg{}
}

func (m model) gracefullyQuit() tea.Msg {
	return quitMsg{}
}