package main

import (
	"flag"
	"fmt"
	"os"
	"sort"
	"time"

	tea "github.com/charmbracelet/bubbletea"
	goFeed "github.com/mmcdole/gofeed"
)

type model struct {
	url      string
	sortAsc  bool
	showDesc bool
	feed     goFeed.Feed
}

func (model model) Init() tea.Cmd {
	// Just return `nil`, which means "no I/O right now, please."
	return nil
}

func (model model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
	switch msg := msg.(type) {
	case tea.KeyMsg:
		switch msg.String() {
		case "ctrl+c", "q":
			return model, tea.Quit
		case "r":
			model.feed = getFeed(model.url)
		case "d":
			model.showDesc = !model.showDesc
		case "s":
			model.sortAsc = !model.sortAsc

		}
	}
	return model, nil
}

func (model model) View() string {
	output := fmt.Sprintf("%t %t\n", model.showDesc, model.sortAsc)
	output = fmt.Sprintf("%s%s\n\n", output, time.Now().String())

	if model.sortAsc {
		sort.Sort(model.feed)
	} else {
		sort.Sort(sort.Reverse(model.feed))
	}

	for _, item := range model.feed.Items {
		output = fmt.Sprintf("%s%s", output, renderFeedItem(item, model.showDesc))
	}
	return output
}

func main() {
	url := os.Getenv("ATOM_URL")
	showTui := flag.Bool("t", false, "TUI mode")
	sortAsc := flag.Bool("s", false, "Sort from oldest to newest")
	showDesc := flag.Bool("d", false, "Show description for each event")
	flag.Parse()

	if url == "" {
		url = "https://5ika.ch/posts/index.xml"
	}

	m := model{
		url:      url,
		sortAsc:  *sortAsc,
		showDesc: *showDesc,
		feed:     getFeed(url),
	}

	if *showTui {
		p := tea.NewProgram(m, tea.WithAltScreen())

		if _, err := p.Run(); err != nil {
			fmt.Printf("Alas, there's been an error: %v", err)
			os.Exit(1)
		}
	} else {
		output := m.View()
		fmt.Print(output)
	}
}