package main

import (
	"context"
	"fmt"
	"log"
	"os"
	"time"

	"github.com/charmbracelet/bubbles/key"
	"github.com/charmbracelet/bubbles/list"
	tea "github.com/charmbracelet/bubbletea"
	"github.com/charmbracelet/lipgloss"
	"github.com/mmcdole/gofeed"
)

type rss_info struct {
	title       string
	description string
	link        string
}

func (i rss_info) Title() string       { return i.title }
func (i rss_info) Description() string { return i.description }
func (i rss_info) Link() string        { return i.link }
func (i rss_info) FilterValue() string { return i.title }

type model struct {
	list         list.Model
	delegateKeys *delegateKeyMap
}

var (
	appStyle = lipgloss.NewStyle().Padding(1, 2)

	titleStyle = lipgloss.NewStyle().
			Foreground(lipgloss.Color("#FFFDF5")).
			Background(lipgloss.Color("#CC11FF")).
			Padding(0, 1)

	statusMessageStyle = lipgloss.NewStyle().
				Foreground(lipgloss.AdaptiveColor{Light: "#FF44FF", Dark: "#CC11FF"}).
				Render

	enterKeyBinding = key.NewBinding(
		key.WithKeys("enter"),
		key.WithHelp("enter", "write playlist"),
	)
)

func newModel() model {
	var (
		delegateKeys = newDelegateKeyMap()
	)

	// Make initial list of items
	items := make([]list.Item, 0)

	argsCount := len(os.Args[1:])
	if argsCount >= 2 {
		ctx, cancel := context.WithTimeout(context.Background(), 60*time.Second)
		defer cancel()

		for _, rss := range os.Args[2:] {
			fp := gofeed.NewParser()
			feed, err := fp.ParseURLWithContext(rss, ctx)
			if err != nil {
				log.Fatal(err)
				os.Exit(1)
			}

			for _, item := range feed.Items {
				items = append(items, rss_info{
					title:       item.Title,
					description: item.Description,
					link:        item.Link,
				})
			}
		}
	} else {
		log.Fatal(fmt.Errorf("%v", "usage: rss2mpv playlist-file rss-url..."))
		os.Exit(1)
	}

	// Setup list
	delegate := newItemDelegate(delegateKeys)
	rssList := list.New(items, delegate, 0, 0)
	rssList.Title = "RSS Feed Links"
	rssList.Styles.Title = titleStyle

	return model{
		list:         rssList,
		delegateKeys: delegateKeys,
	}
}

func (m model) Init() tea.Cmd {
	return tea.EnterAltScreen
}

func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
	var cmds []tea.Cmd

	switch msg := msg.(type) {
	case tea.WindowSizeMsg:
		h, v := appStyle.GetFrameSize()
		m.list.SetSize(msg.Width-h, msg.Height-v)

	case tea.KeyMsg:
		// Don't match any of the keys below if we're actively filtering.
		if m.list.FilterState() == list.Filtering {
			break
		}

		switch {
		case key.Matches(msg, enterKeyBinding):
			playlist, err := os.OpenFile(os.Args[1], os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
			if err != nil {
				log.Fatal(err)
				os.Exit(1)
			}
			defer playlist.Close()
			for _, item := range m.list.Items() {
				playlist.WriteString(item.(rss_info).link + "\n")
			}

			m.list.NewStatusMessage(statusMessageStyle("Wrote to " + os.Args[1] + "!"))

			return m, nil
		}
	}

	// This will also call our delegate's update function.
	newListModel, cmd := m.list.Update(msg)
	m.list = newListModel
	cmds = append(cmds, cmd)

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

func (m model) View() string {
	return appStyle.Render(m.list.View())
}

func main() {
	if err := tea.NewProgram(newModel()).Start(); err != nil {
		fmt.Println("Error running program:", err)
		os.Exit(1)
	}
	os.Exit(0)
}