package cmd

import (
	"log/slog"
	"os"
	"os/exec"
	"strings"

	"github.com/atotto/clipboard"
	"github.com/ayn2op/discordo/internal/constants"
	"github.com/diamondburned/arikawa/v3/api"
	"github.com/diamondburned/arikawa/v3/discord"
	"github.com/diamondburned/arikawa/v3/utils/json/option"
	"github.com/gdamore/tcell/v2"
	"github.com/rivo/tview"
)

type MessageInput struct {
	*tview.TextArea
	app            *tview.Application
	replyMessageID discord.MessageID
}

func newMessageInput(app *tview.Application) *MessageInput {
	mi := &MessageInput{
		TextArea: tview.NewTextArea(),
		app:      app,
	}

	mi.SetTextStyle(tcell.StyleDefault.Background(tcell.GetColor(cfg.Theme.BackgroundColor)))
	mi.SetClipboard(func(s string) {
		_ = clipboard.WriteAll(s)
	}, func() string {
		text, _ := clipboard.ReadAll()
		return text
	})

	mi.SetInputCapture(mi.onInputCapture)
	mi.SetBackgroundColor(tcell.GetColor(cfg.Theme.BackgroundColor))

	mi.SetTitleColor(tcell.GetColor(cfg.Theme.TitleColor))
	mi.SetTitleAlign(tview.AlignLeft)

	p := cfg.Theme.BorderPadding
	mi.SetBorder(cfg.Theme.Border)
	mi.SetBorderColor(tcell.GetColor(cfg.Theme.BorderColor))
	mi.SetBorderPadding(p[0], p[1], p[2], p[3])

	return mi
}

func (mi *MessageInput) reset() {
	mi.replyMessageID = 0
	mi.SetTitle("")
	mi.SetText("", true)
}

func (mi *MessageInput) onInputCapture(event *tcell.EventKey) *tcell.EventKey {
	switch event.Name() {
	case cfg.Keys.MessageInput.Send:
		mi.send()
		return nil
	case cfg.Keys.MessageInput.Editor:
		mi.editor()
		return nil
	case cfg.Keys.MessageInput.Cancel:
		mi.reset()
		return nil
	}

	return event
}

func (mi *MessageInput) send() {
	if !mainFlex.guildsTree.selectedChannelID.IsValid() {
		return
	}

	text := strings.TrimSpace(mi.GetText())
	if text == "" {
		return
	}

	if mi.replyMessageID != 0 {
		data := api.SendMessageData{
			Content:         text,
			Reference:       &discord.MessageReference{MessageID: mi.replyMessageID},
			AllowedMentions: &api.AllowedMentions{RepliedUser: option.False},
		}

		if strings.HasPrefix(mi.GetTitle(), "[@]") {
			data.AllowedMentions.RepliedUser = option.True
		}

		go func() {
			if _, err := discordState.SendMessageComplex(mainFlex.guildsTree.selectedChannelID, data); err != nil {
				slog.Error("failed to send message", "err", err)
			}
		}()
	} else {
		go func() {
			if _, err := discordState.SendMessage(mainFlex.guildsTree.selectedChannelID, text); err != nil {
				slog.Error("failed to send message", "err", err)
			}
		}()
	}

	mi.replyMessageID = 0
	mi.reset()

	mainFlex.messagesText.Highlight()
	mainFlex.messagesText.ScrollToEnd()
}

func (mi *MessageInput) editor() {
	e := cfg.Editor
	if e == "default" {
		e = os.Getenv("EDITOR")
	}

	f, err := os.CreateTemp("", constants.TmpFilePattern)
	if err != nil {
		slog.Error("failed to create temporary file", "err", err)
		return
	}
	_, _ = f.WriteString(mi.GetText())
	f.Close()

	defer os.Remove(f.Name())

	cmd := exec.Command(e, f.Name())
	cmd.Stdin = os.Stdin
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr

	mi.app.Suspend(func() {
		err := cmd.Run()
		if err != nil {
			slog.Error("failed to run command", "err", err, "command", cmd)
			return
		}
	})

	msg, err := os.ReadFile(f.Name())
	if err != nil {
		slog.Error("failed to read temporary file", "err", err, "name", f.Name())
		return
	}

	mi.SetText(strings.TrimSpace(string(msg)), true)
}