package handler

import (
	"context"
	"fmt"
	"log/slog"
	"strings"

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

	"uptodownBot/internal/domain"
)

func (h *Handler) buildSettingsKeyboard(userID int64, prefs *domain.UserPreferences) (string, models.InlineKeyboardMarkup) {
	audioFmt := prefs.DefaultAudioFormat
	if audioFmt == "" {
		audioFmt = "best"
	}
	videoFmt := prefs.DefaultVideoFormat
	if videoFmt == "" {
		videoFmt = "best"
	}
	containerLabel := prefs.DefaultContainer
	if containerLabel == "" {
		containerLabel = "mp4"
	}
	langLabel := prefs.DefaultLanguage
	if langLabel == "" {
		langLabel = "Default"
	}

	rows := [][]models.InlineKeyboardButton{
		{
			{Text: fmt.Sprintf("Format: %s/%s", audioFmt, videoFmt), CallbackData: "settings_format"},
		},
		{
			{Text: fmt.Sprintf("Container: %s", containerLabel), CallbackData: "settings_container"},
			{Text: fmt.Sprintf("Language: %s", langLabel), CallbackData: "settings_language"},
		},
		{{Text: "Delete all data", CallbackData: "deleteaccount", Style: "danger"}},
		{{Text: "Back to Menu", CallbackData: "back_menu"}},
	}
	return "Settings:", models.InlineKeyboardMarkup{InlineKeyboard: rows}
}

func (h *Handler) settingsCallback(ctx context.Context, chatID int64, msgID int, cbID string, userID int64) {
	defer h.answerCb(ctx, cbID)
	prefs, err := h.Repo.GetOrCreatePreferences(userID)
	if err != nil {
		return
	}
	text, kb := h.buildSettingsKeyboard(userID, prefs)
	h.editText(ctx, chatID, msgID, text, &kb)
}

func (h *Handler) backToSettings(ctx context.Context, chatID int64, msgID int, userID int64) {
	prefs, err := h.Repo.GetOrCreatePreferences(userID)
	if err != nil {
		return
	}
	text, kb := h.buildSettingsKeyboard(userID, prefs)
	h.editText(ctx, chatID, msgID, text, &kb)
}

func (h *Handler) handleSettingsSelection(ctx context.Context, chatID int64, msgID int, userID int64, setting string) {
	prefs, err := h.Repo.GetOrCreatePreferences(userID)
	if err != nil {
		return
	}

	switch setting {
	case "format":
		text, kb := h.buildFormatPicker(prefs)
		h.editText(ctx, chatID, msgID, text, &kb)
	case "format_audio":
		text, kb := h.buildAudioFormatPicker(prefs)
		h.editText(ctx, chatID, msgID, text, &kb)
	case "format_video":
		text, kb := h.buildVideoFormatPicker(prefs)
		h.editText(ctx, chatID, msgID, text, &kb)
	case "container":
		text, kb := h.buildContainerPicker(prefs)
		h.editText(ctx, chatID, msgID, text, &kb)
	case "language":
		text, kb := h.buildLanguagePicker(prefs)
		h.editText(ctx, chatID, msgID, text, &kb)
	}
}

func (h *Handler) buildFormatPicker(prefs *domain.UserPreferences) (string, models.InlineKeyboardMarkup) {
	rows := [][]models.InlineKeyboardButton{
		{{Text: "Audio", CallbackData: "settings_format_audio"}},
		{{Text: "Video", CallbackData: "settings_format_video"}},
		{{Text: "Back to Settings", CallbackData: "back_settings"}},
	}
	return "Choose format type to set default:", models.InlineKeyboardMarkup{InlineKeyboard: rows}
}

func (h *Handler) buildAudioFormatPicker(prefs *domain.UserPreferences) (string, models.InlineKeyboardMarkup) {
	bitrates := []string{"best", "128k", "192k", "256k", "320k"}
	rows := [][]models.InlineKeyboardButton{}
	for _, b := range bitrates {
		label := b
		if b == prefs.DefaultAudioFormat {
			label = "> " + label
		}
		rows = append(rows, []models.InlineKeyboardButton{
			{Text: label, CallbackData: "settings_set_audioformat_" + b},
		})
	}
	rows = append(rows, []models.InlineKeyboardButton{
		{Text: "Back", CallbackData: "back_format"},
	})
	return "Select default audio format:", models.InlineKeyboardMarkup{InlineKeyboard: rows}
}

func (h *Handler) buildVideoFormatPicker(prefs *domain.UserPreferences) (string, models.InlineKeyboardMarkup) {
	resolutions := []string{"best", "2160p", "1440p", "1080p", "720p", "480p", "360p"}
	rows := [][]models.InlineKeyboardButton{}
	row := []models.InlineKeyboardButton{}
	for i, r := range resolutions {
		label := r
		if r == prefs.DefaultVideoFormat {
			label = "> " + label
		}
		row = append(row, models.InlineKeyboardButton{
			Text: label, CallbackData: "settings_set_videoformat_" + r,
		})
		if len(row) == 3 || i == len(resolutions)-1 {
			rows = append(rows, row)
			row = nil
		}
	}
	rows = append(rows, []models.InlineKeyboardButton{
		{Text: "Back", CallbackData: "back_format"},
	})
	return "Select default video format:", models.InlineKeyboardMarkup{InlineKeyboard: rows}
}

func (h *Handler) buildContainerPicker(prefs *domain.UserPreferences) (string, models.InlineKeyboardMarkup) {
	containers := []string{"mp4", "mkv", "webm", "mp3", "m4a", "opus"}
	rows := [][]models.InlineKeyboardButton{}
	row := []models.InlineKeyboardButton{}
	for i, c := range containers {
		label := c
		if c == prefs.DefaultContainer {
			label = "> " + label
		}
		row = append(row, models.InlineKeyboardButton{
			Text: label, CallbackData: "settings_set_container_" + c,
		})
		if len(row) == 3 || i == len(containers)-1 {
			rows = append(rows, row)
			row = nil
		}
	}
	rows = append(rows, []models.InlineKeyboardButton{
		{Text: "Back to Settings", CallbackData: "back_settings"},
	})
	return "Select default container:", models.InlineKeyboardMarkup{InlineKeyboard: rows}
}

func (h *Handler) buildLanguagePicker(prefs *domain.UserPreferences) (string, models.InlineKeyboardMarkup) {
	languages := []string{"", "en", "es", "ja", "ko", "fr", "de", "zh", "ar", "pt", "ru"}
	langLabels := map[string]string{
		"": "Default", "en": "English", "es": "Spanish", "ja": "Japanese",
		"ko": "Korean", "fr": "French", "de": "German", "zh": "Chinese",
		"ar": "Arabic", "pt": "Portuguese", "ru": "Russian",
	}
	rows := [][]models.InlineKeyboardButton{}
	row := []models.InlineKeyboardButton{}
	for i, l := range languages {
		label := langLabels[l]
		if l == prefs.DefaultLanguage {
			label = "> " + label
		}
		row = append(row, models.InlineKeyboardButton{
			Text: label, CallbackData: "settings_set_language_" + l,
		})
		if len(row) == 2 || i == len(languages)-1 {
			rows = append(rows, row)
			row = nil
		}
	}
	rows = append(rows, []models.InlineKeyboardButton{
		{Text: "Back to Settings", CallbackData: "back_settings"},
	})
	return "Select default language:", models.InlineKeyboardMarkup{InlineKeyboard: rows}
}

func (h *Handler) handleSettingsSet(ctx context.Context, chatID int64, msgID int, userID int64, setting string) {
	parts := strings.SplitN(setting, "_", 2)
	if len(parts) < 2 {
		return
	}
	action := parts[0]
	value := parts[1]

	prefs, err := h.Repo.GetOrCreatePreferences(userID)
	if err != nil {
		return
	}

	changed := false
	switch action {
	case "audioformat":
		prefs.DefaultAudioFormat = value
		changed = true
	case "videoformat":
		prefs.DefaultVideoFormat = value
		changed = true
	case "container":
		prefs.DefaultContainer = value
		changed = true
	case "language":
		prefs.DefaultLanguage = value
		changed = true
	}
	if changed {
		_ = h.Repo.UpdatePreferences(userID, prefs)
	}
	h.backToSettings(ctx, chatID, msgID, userID)
}

// deleteAccountPrompt shows the deletion confirmation prompt.
func (h *Handler) deleteAccountPrompt(ctx context.Context, chatID int64, msgID int, userID int64) {
	kb := deleteConfirmKeyboard(userID)
	h.editText(ctx, chatID, msgID, "This will permanently delete ALL your data (preferences, quotas, history).\nAre you sure?", &kb)
}

// deleteAccountConfirm permanently deletes all user data.
func (h *Handler) deleteAccountConfirm(ctx context.Context, chatID int64, msgID int, userID int64) {
	if err := h.Repo.DeleteUserData(userID); err != nil {
		slog.Error("delete user data", "user_id", userID, "error", err)
		h.editText(ctx, chatID, msgID, "Error deleting data. Please try again.", nil)
		return
	}
	h.editText(ctx, chatID, msgID, "All your data has been deleted. You can start fresh by sending /start.", nil)
}