package handler

import (
	"context"
	"fmt"
	"strconv"
	"strings"

	"github.com/go-telegram/bot/models"

	"uptodownBot/internal/domain"
)

func (h *Handler) handleSearchCommand(ctx context.Context, msg *models.Message, userID int64) {
	h.promptForInput(ctx, msg.Chat.ID, 0, userID, PendingSearch,
		"Enter a YouTube search query:", map[string]string{"source": "youtube"})
}

func (h *Handler) handleMusicSearchCommand(ctx context.Context, msg *models.Message, userID int64) {
	h.promptForInput(ctx, msg.Chat.ID, 0, userID, PendingSearch,
		"Enter a YouTube Music search query:", map[string]string{"source": "ytmusic"})
}

func (h *Handler) handleSearchQuery(ctx context.Context, chatID int64, text string, userID int64, source string) {
	results, err := h.YtDlp.Search(text, source, 10)
	if err != nil {
		h.sendText(ctx, chatID, fmt.Sprintf("Search failed: %s", err.Error()))
		return
	}
	if len(results) == 0 {
		h.sendText(ctx, chatID, "No results found.")
		return
	}

	state := &domain.SearchState{
		Query:   text,
		Entries: results,
		Page:    0,
		PerPage: 5,
		Source:  source,
	}
	ss := &stepState{SearchState: state}
	h.setUserStepState(chatID, ss)

	kb := searchResultsKeyboard(state)
	h.sendWithKB(ctx, chatID, fmt.Sprintf("Search results for '%s':", text), kb)
}

func (h *Handler) handleSearchCallback(ctx context.Context, chatID int64, msgID int, userID int64, data string) {
	switch {
	case data == "refresh":
		ss := h.getUserStepState(chatID)
		if ss == nil || ss.SearchState == nil {
			return
		}
		h.handleSearchQuery(ctx, chatID, ss.SearchState.Query, userID, ss.SearchState.Source)
	case strings.HasPrefix(data, "page_"):
		h.handleSearchPage(ctx, chatID, msgID, userID, data[5:])
	case strings.HasPrefix(data, "select_"):
		h.handleSearchSelect(ctx, chatID, msgID, userID, data[7:])
	}
}

func (h *Handler) handleSearchPage(ctx context.Context, chatID int64, msgID int, userID int64, pageStr string) {
	ss := h.getUserStepState(chatID)
	if ss == nil || ss.SearchState == nil {
		return
	}
	page, err := strconv.Atoi(pageStr)
	if err != nil {
		return
	}
	totalPages := (len(ss.SearchState.Entries) + ss.SearchState.PerPage - 1) / ss.SearchState.PerPage
	if page < 0 || page >= totalPages {
		return
	}
	ss.SearchState.Page = page
	h.setUserStepState(chatID, ss)

	kb := searchResultsKeyboard(ss.SearchState)
	h.editText(ctx, chatID, msgID, fmt.Sprintf("Search results for '%s':", ss.SearchState.Query), &kb)
}

func (h *Handler) handleSearchSelect(ctx context.Context, chatID int64, msgID int, userID int64, entryURL string) {
	h.clearStepState(chatID)
	h.editText(ctx, chatID, msgID, "Fetching media info...", nil)
	h.handleURLInput(ctx, chatID, entryURL, userID)
}

func searchResultsKeyboard(state *domain.SearchState) models.InlineKeyboardMarkup {
	totalPages := (len(state.Entries) + state.PerPage - 1) / state.PerPage
	if totalPages < 1 {
		totalPages = 1
	}

	rows := [][]models.InlineKeyboardButton{}
	start := state.Page * state.PerPage
	end := start + state.PerPage
	if end > len(state.Entries) {
		end = len(state.Entries)
	}

	for i := start; i < end; i++ {
		e := state.Entries[i]
		title := e.Title
		if len(title) > 40 {
			title = title[:37] + "..."
		}
		label := title
		if e.Duration > 0 {
			label += fmt.Sprintf(" (%s)", formatDuration(e.Duration))
		}
		rows = append(rows, []models.InlineKeyboardButton{
			{Text: label, CallbackData: "search_select_" + e.URL},
		})
	}

	navRow := []models.InlineKeyboardButton{}
	navRow = append(navRow, models.InlineKeyboardButton{
		Text: "<", CallbackData: fmt.Sprintf("search_page_%d", state.Page-1),
	})
	navRow = append(navRow, models.InlineKeyboardButton{
		Text: fmt.Sprintf("Page %d/%d", state.Page+1, totalPages), CallbackData: "noop",
	})
	navRow = append(navRow, models.InlineKeyboardButton{
		Text: ">", CallbackData: fmt.Sprintf("search_page_%d", state.Page+1),
	})
	rows = append(rows, navRow)

	rows = append(rows, []models.InlineKeyboardButton{
		{Text: "New Search", CallbackData: "search_refresh"},
		{Text: "Cancel", CallbackData: "cancel_dl"},
	})

	return models.InlineKeyboardMarkup{InlineKeyboard: rows}
}