package bot

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

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

	"worktimeBot/internal/db"
)

// handleSetReportTime parses a HH:MM argument and updates the user's report time.
func (h *Handler) handleSetReportTime(ctx context.Context, msg *models.Message) {
	args := ""
	if len(msg.Text) > 16 { // "/setreporttime " is 15 chars
		args = strings.TrimSpace(msg.Text[15:])
	}
	if args == "" {
		user, err := h.getOrCreateUser(msg.Chat.ID)
		if err != nil {
			h.sendText(ctx, msg.Chat.ID, "Error loading profile")
			return
		}
		h.sendText(ctx, msg.Chat.ID, fmt.Sprintf("Current report time: %s\nUsage: /setreporttime HH:MM (24-hour)", user.ReportTime))
		return
	}
	if len(args) != 5 || args[2] != ':' {
		h.sendText(ctx, msg.Chat.ID, "Invalid format. Usage: /setreporttime HH:MM (24-hour)")
		return
	}
	hours, err1 := strconv.Atoi(args[:2])
	mins, err2 := strconv.Atoi(args[3:])
	if err1 != nil || err2 != nil || hours < 0 || hours > 23 || mins < 0 || mins > 59 {
		h.sendText(ctx, msg.Chat.ID, "Invalid time. Usage: /setreporttime HH:MM (24-hour)")
		return
	}
	user, err := h.getOrCreateUser(msg.Chat.ID)
	if err != nil {
		h.sendText(ctx, msg.Chat.ID, "Error updating report time")
		return
	}
	user.ReportTime = args
	if err := h.DB.UpdateUser(user); err != nil {
		h.sendText(ctx, msg.Chat.ID, "Error updating report time")
		return
	}
	h.sendText(ctx, msg.Chat.ID, fmt.Sprintf("Report time set to %s", args))
}

// handleAccentMsg shows the accent color picker.
func (h *Handler) handleAccentMsg(ctx context.Context, msg *models.Message) {
	user, err := h.getOrCreateUser(msg.Chat.ID)
	if err != nil {
		h.sendText(ctx, msg.Chat.ID, "Error loading profile")
		return
	}
	text, kb := h.buildAccentKeyboard(user)
	h.sendWithKB(ctx, msg.Chat.ID, text, kb)
}

// handleSetTimezone validates and updates the user's IANA timezone.
func (h *Handler) handleSetTimezone(ctx context.Context, msg *models.Message) {
	args := ""
	if len(msg.Text) > 13 { // "/settimezone " is 12 chars
		args = strings.TrimSpace(msg.Text[13:])
	}
	if args == "" {
		user, err := h.getOrCreateUser(msg.Chat.ID)
		if err != nil {
			h.sendText(ctx, msg.Chat.ID, "Error loading profile")
			return
		}
		h.sendText(ctx, msg.Chat.ID, fmt.Sprintf("Current timezone: %s\nUsage: /settimezone <IANA timezone>\nExamples: Asia/Tehran, Europe/London, America/New_York", user.Timezone))
		return
	}
	loc, err := time.LoadLocation(args)
	if err != nil {
		h.sendText(ctx, msg.Chat.ID, fmt.Sprintf("Invalid timezone: %s\nUse IANA format, e.g. Asia/Tehran, Europe/London", args))
		return
	}
	user, err := h.getOrCreateUser(msg.Chat.ID)
	if err != nil {
		h.sendText(ctx, msg.Chat.ID, "Error loading profile")
		return
	}
	user.Timezone = args
	if err := h.DB.UpdateUser(user); err != nil {
		h.sendText(ctx, msg.Chat.ID, "Error saving timezone")
		return
	}
	now := time.Now().In(loc)
	h.sendText(ctx, msg.Chat.ID, fmt.Sprintf("Timezone set to %s (current time: %s)", args, now.Format("15:04")))
}

// settingsCallback shows the settings inline menu.
func (h *Handler) settingsCallback(ctx context.Context, chatID int64, msgID int, callbackID string) {
	h.answerCb(ctx, callbackID)
	user, err := h.getOrCreateUser(chatID)
	if err != nil {
		return
	}
	text, kb := h.buildSettingsKeyboard(user)
	h.editText(ctx, chatID, msgID, text, &kb)
}

// buildSettingsKeyboard returns the settings menu text and inline keyboard.
func (h *Handler) buildSettingsKeyboard(user *db.User) (string, models.InlineKeyboardMarkup) {
	reportStatus := "disabled"
	if user.ReportEnabled {
		reportStatus = "enabled"
	}
	rows := [][]models.InlineKeyboardButton{
		{{Text: fmt.Sprintf("Timezone: %s", user.Timezone), CallbackData: "timezone"}},
		{{Text: fmt.Sprintf("Accent: %s", user.ExportAccent), CallbackData: "accent"}},
		{{Text: fmt.Sprintf("Calendar: %s", user.Calendar), CallbackData: "caltype"}},
		{{Text: fmt.Sprintf("Report: %s", reportStatus), CallbackData: "reporttoggle"}},
		{{Text: fmt.Sprintf("Report time: %s", user.ReportTime), CallbackData: "reporttime"}},
		{{Text: "History", CallbackData: "history"}},
		{{Text: "Back to Menu", CallbackData: "back_menu"}},
	}
	return "Settings:", models.InlineKeyboardMarkup{InlineKeyboard: rows}
}

// accentCallback shows the accent color picker (inline edit).
func (h *Handler) accentCallback(ctx context.Context, chatID int64, msgID int, callbackID string) {
	h.answerCb(ctx, callbackID)
	user, err := h.getOrCreateUser(chatID)
	if err != nil {
		return
	}
	text, kb := h.buildAccentKeyboard(user)
	h.editText(ctx, chatID, msgID, text, &kb)
}

// timezoneCallback shows the current timezone and instructions to change it.
func (h *Handler) timezoneCallback(ctx context.Context, chatID int64, msgID int, callbackID string) {
	h.answerCb(ctx, callbackID)
	user, err := h.getOrCreateUser(chatID)
	if err != nil {
		return
	}
	text := fmt.Sprintf("Current timezone: %s\n\nUse /settimezone <name> to change it.\nExamples: Asia/Tehran, Europe/London, America/New_York", user.Timezone)
	kb := models.InlineKeyboardMarkup{
		InlineKeyboard: [][]models.InlineKeyboardButton{
			{{Text: "Back to Settings", CallbackData: "back_settings"}},
		},
	}
	h.editText(ctx, chatID, msgID, text, &kb)
}

// buildAccentKeyboard returns the accent color picker keyboard.
func (h *Handler) buildAccentKeyboard(user *db.User) (string, models.InlineKeyboardMarkup) {
	type accentOption struct {
		name  string
		color string
	}
	accents := []accentOption{
		{"ocean", "Blue"},
		{"beach", "Warm"},
		{"rose", "Pink"},
		{"catppuccin", "Purple"},
	}
	rows := [][]models.InlineKeyboardButton{}
	for _, a := range accents {
		label := fmt.Sprintf("%s (%s)", a.name, a.color)
		if a.name == user.ExportAccent {
			label = "> " + label
		}
		rows = append(rows, []models.InlineKeyboardButton{
			{Text: label, CallbackData: "accent_" + a.name},
		})
	}
	rows = append(rows, []models.InlineKeyboardButton{
		{Text: "Back to Settings", CallbackData: "back_settings"},
	})
	return "Select accent color:", models.InlineKeyboardMarkup{InlineKeyboard: rows}
}

// selectAccent sets the user's export accent color after validation.
func (h *Handler) selectAccent(ctx context.Context, chatID int64, msgID int, callbackID, name string) {
	h.answerCb(ctx, callbackID)
	user, err := h.getOrCreateUser(chatID)
	if err != nil {
		return
	}
	valid := map[string]bool{"ocean": true, "beach": true, "rose": true, "catppuccin": true}
	if !valid[name] {
		return
	}
	user.ExportAccent = name
	if err := h.DB.UpdateUser(user); err != nil {
		return
	}
	kb := models.InlineKeyboardMarkup{
		InlineKeyboard: [][]models.InlineKeyboardButton{
			{{Text: "Back to Settings", CallbackData: "back_settings"}},
		},
	}
	h.editText(ctx, chatID, msgID, fmt.Sprintf("Accent set to: %s", name), &kb)
}

// reportTimeCallback shows the current report time setting.
func (h *Handler) reportTimeCallback(ctx context.Context, chatID int64, msgID int, callbackID string) {
	h.answerCb(ctx, callbackID)
	user, err := h.getOrCreateUser(chatID)
	if err != nil {
		return
	}
	text := fmt.Sprintf("Current report time: %s\nUse /setreporttime HH:MM to change it.", user.ReportTime)
	kb := models.InlineKeyboardMarkup{
		InlineKeyboard: [][]models.InlineKeyboardButton{
			{{Text: "Back to Settings", CallbackData: "back_settings"}},
		},
	}
	h.editText(ctx, chatID, msgID, text, &kb)
}

// backToSettings returns to the main settings menu.
func (h *Handler) backToSettings(ctx context.Context, chatID int64, msgID int, callbackID string) {
	h.answerCb(ctx, callbackID)
	user, err := h.getOrCreateUser(chatID)
	if err != nil {
		return
	}
	text, kb := h.buildSettingsKeyboard(user)
	h.editText(ctx, chatID, msgID, text, &kb)
}

// calTypeCallback shows the calendar type selector.
func (h *Handler) calTypeCallback(ctx context.Context, chatID int64, msgID int, callbackID string) {
	h.answerCb(ctx, callbackID)
	user, err := h.getOrCreateUser(chatID)
	if err != nil {
		return
	}
	text, kb := h.buildCalendarKeyboard(user)
	h.editText(ctx, chatID, msgID, text, &kb)
}

// buildCalendarKeyboard returns the calendar type selector keyboard.
func (h *Handler) buildCalendarKeyboard(user *db.User) (string, models.InlineKeyboardMarkup) {
	cals := []string{"gregorian", "jalali", "hijri"}
	calLabels := map[string]string{
		"gregorian": "Gregorian",
		"jalali":    "Jalali",
		"hijri":     "Hijri",
	}
	rows := [][]models.InlineKeyboardButton{}
	for _, c := range cals {
		label := calLabels[c]
		if c == user.Calendar {
			label = "> " + label
		}
		rows = append(rows, []models.InlineKeyboardButton{
			{Text: label, CallbackData: "caltype_" + c},
		})
	}
	rows = append(rows, []models.InlineKeyboardButton{
		{Text: "Back to Settings", CallbackData: "back_settings"},
	})
	return "Select calendar type:", models.InlineKeyboardMarkup{InlineKeyboard: rows}
}

// selectCalendar sets the user's calendar after validation.
func (h *Handler) selectCalendar(ctx context.Context, chatID int64, msgID int, callbackID, name string) {
	h.answerCb(ctx, callbackID)
	valid := map[string]bool{"gregorian": true, "jalali": true, "hijri": true}
	if !valid[name] {
		return
	}
	user, err := h.getOrCreateUser(chatID)
	if err != nil {
		return
	}
	user.Calendar = name
	if err := h.DB.UpdateUser(user); err != nil {
		return
	}
	text, kb := h.buildSettingsKeyboard(user)
	h.editText(ctx, chatID, msgID, text, &kb)
}