package handlers

import (
	"fmt"
	"log"
	"strings"
	"time"

	utils "git.zio.sh/astra/telegram-approval-join/pkg/utils"
	api "github.com/OvyFlash/telegram-bot-api"
)

// HandleCallbackQuery processes inline button callbacks (approve/decline/leave).
func (bot *Bot) HandleCallbackQuery(query *api.CallbackQuery) {
	data := strings.Join(strings.Split(query.Data, "_"), " ")
	var action string
	var args int64
	_, err := fmt.Sscanf(data, "%s %d", &action, &args)
	if err != nil {
		log.Printf("Failed to parse callback data: %v", err)
		return
	}

	if action == "leave" {
		utils.LeaveChatRequest(bot.API, []int64{args})
		utils.EditMessage(bot.API, query.Message.Chat.ID, query.Message.MessageID,
			fmt.Sprintf("We have left chat <i>%d</i>", args))
		callback := api.NewCallback(query.ID, "")
		bot.API.Request(callback)
		return
	}

	user := bot.GetPendingUser(args)
	if user == nil {
		log.Printf("No pending request for user ID %d", args)
		msg := api.NewMessage(query.Message.Chat.ID, "Unable to find user, bot may have restarted")
		msg.ReplyParameters = api.ReplyParameters{MessageID: query.Message.MessageID, ChatID: query.Message.Chat.ID}
		r, _ := bot.API.Send(msg)

		edit := api.NewEditMessageText(query.Message.Chat.ID, r.ReplyToMessage.MessageID, r.ReplyToMessage.Text)
		edit.Entities = r.ReplyToMessage.Entities
		bot.API.Send(edit)

		callback := api.NewCallback(query.ID, "")
		bot.API.Request(callback)
		return
	}

	userString := utils.BuildUserString(&user.From)
	adminUserString := utils.BuildUserString(query.From)

	switch action {
	case "approve":
		bot.handleApproveRequest(query, user, userString, adminUserString)
	case "decline":
		bot.handleDeclineRequest(query, user, userString, adminUserString)
	}

	if bot.Config.DeleteRequestAfterDecision {
		deleteTimer := time.NewTimer(10 * time.Second)
		go func() {
			defer deleteTimer.Stop()
			<-deleteTimer.C
			del := api.NewDeleteMessage(query.Message.Chat.ID, query.Message.MessageID)
			bot.API.Send(del)
		}()
	}

	bot.DeletePendingUser(args)
}

// handleApproveRequest approves a join request and sends approval callback.
func (bot *Bot) handleApproveRequest(query *api.CallbackQuery, user *ExtendedChatJoinRequest, userString, adminUserString string) {
	r := api.ApproveChatJoinRequestConfig{
		ChatConfig: api.ChatConfig{
			ChatID: user.ChatJoinRequest.Chat.ID,
		},
		UserID: user.ChatJoinRequest.From.ID,
	}
	_, e := bot.API.Request(r)
	if e != nil {
		log.Println(e.Error())
		edit := api.NewEditMessageText(query.Message.Chat.ID, query.Message.MessageID, query.Message.Text)
		edit.Entities = query.Message.Entities
		bot.API.Send(edit)
		return
	}

	utils.EditMessage(bot.API, query.Message.Chat.ID, query.Message.MessageID,
		fmt.Sprintf(AdminApprovedMsg,
			userString, user.From.ID, user.JoinReason, adminUserString,
			time.Now().Format("2006-01-02 15:04:05")))

	if bot.Config.SendApprovalMessage {
		utils.SendMessage(bot.API, user.From.ID, 0, bot.Config.ApprovalMessage)
	}

	callback := api.NewCallback(query.ID, "Join request approved.")
	bot.API.Request(callback)
}

// handleDeclineRequest declines a join request and sends decline callback.
func (bot *Bot) handleDeclineRequest(query *api.CallbackQuery, user *ExtendedChatJoinRequest, userString, adminUserString string) {
	r := api.DeclineChatJoinRequest{
		ChatConfig: api.ChatConfig{
			ChatID: user.ChatJoinRequest.Chat.ID,
		},
		UserID: user.ChatJoinRequest.From.ID,
	}
	_, e := bot.API.Request(r)
	if e != nil {
		log.Println(e.Error())
		edit := api.NewEditMessageText(query.Message.Chat.ID, query.Message.MessageID, query.Message.Text)
		edit.Entities = query.Message.Entities
		bot.API.Send(edit)
		return
	}

	utils.EditMessage(bot.API, query.Message.Chat.ID, query.Message.MessageID,
		fmt.Sprintf(AdminDeclinedMsg, userString, user.From.ID, user.JoinReason, adminUserString,
			time.Now().Format("2006-01-02 15:04:05"),
			"(no reason provided, reply to this to set one, prepend with + to also send to user)"),
	)

	callback := api.NewCallback(query.ID, "Join request declined.")
	bot.API.Request(callback)
}

// HandleDeclineReason allows admins to provide a decline reason by replying to decline messages.
func (bot *Bot) HandleDeclineReason(update *api.Update) {
	repliedMsg := update.Message.ReplyToMessage
	if !strings.Contains(repliedMsg.Text,
		"(no reason provided, reply to this to set one, prepend with + to also send to user)") {
		return
	}

	lines := strings.Split(repliedMsg.Text, "\n")
	userString := utils.BuildUserString(update.Message.From)

	if strings.TrimPrefix(lines[3], "Declined by: ") != userString {
		return
	}

	reason := utils.EscapeHTML(update.Message.Text)
	userID, username, joinReason, declinedBy, declinedAt := utils.GetInfoFromMsg(repliedMsg.Text)
	entities, _ := utils.FilterEntitiesByTypeWithContext(repliedMsg, "italic")
	if len(entities) >= 1 {
		username = fmt.Sprintf("<i>%s</i>", entities[0].Text)
	}

	if strings.HasPrefix(update.Message.Text, "+") {
		reason = utils.EscapeHTML(update.Message.Text[1:])
		utils.SendMessage(bot.API, userID, 0,
			fmt.Sprintf("Your join request was declined for the following reason:\n\n%s", reason))
	}

	utils.EditMessage(bot.API, update.Message.Chat.ID, repliedMsg.MessageID,
		fmt.Sprintf(AdminDeclinedMsg, username, userID, joinReason, declinedBy, declinedAt, reason))
}