import {
  DEFAULT_LOCALE,
  LOCALE_OPTIONS,
  getOppositeLocale,
  resolveLocale,
  type AppLocale
} from '~~/shared/i18n'

const messages = {
  en: {
    'common.back': 'Back',
    'common.cancel': 'Cancel',
    'common.category': 'Category',
    'common.date': 'Date',
    'common.login': 'Login',
    'common.logout': 'Logout',
    'common.menu': 'Menu',
    'common.close': 'Close',
    'common.open': 'Open',
    'common.phoneNumber': 'Phone Number',
    'common.price': 'Price',
    'common.public': 'Public',
    'common.refresh': 'Refresh',
    'common.seats': 'Seats',
    'common.status': 'Status',
    'common.time': 'Time',
    'common.totalPrice': 'Total Price',
    'common.venue': 'Venue',
    'common.switchLanguage': 'Switch language',
    'common.language': 'Language',
    'layout.brand': 'Dinner Ticket System',
    'layout.footer': '© 2026 DAP 60th Anniversary Committee. All rights reserved.',
    'layout.signedOut': 'Signed out',
    'layout.sessionCleared': 'Your session has been cleared.',
    'layout.logoutFailed': 'Logout failed',
    'layout.logoutFailedDescription': 'Unable to end the current session.',
    'nav.bookings': 'Bookings',
    'nav.security': 'Security',
    'nav.users': 'Users',
    'role.superAdmin': 'Super Admin',
    'role.staff': 'Staff',
    'booking.name': 'Name',
    'booking.namePlaceholder': 'e.g. John Doe',
    'booking.phonePlaceholder': 'e.g. +60123456789',
    'booking.bookingMode': 'Booking Mode',
    'booking.quantity': 'Quantity',
    'booking.ticketCategory': 'Ticket Category',
    'booking.personInCharge': 'Person In Charge',
    'booking.bookNow': 'Book Now',
    'booking.seatGeneration': 'This booking will generate {count} {seatLabel}.',
    'booking.noPicTitle': 'No person in charge available',
    'booking.noPicDescription': 'Add a user with a phone number in the management page first.',
    'booking.whatsappOpened': 'WhatsApp booking draft opened',
    'booking.whatsappOpenedDescription': 'Booking details and the confirmation link were sent to {name}.',
    'booking.createFailed': 'Booking could not be created',
    'booking.tryAgain': 'Please try again in a moment.',
    'booking.nameRequired': 'Please enter the guest or organizer name.',
    'booking.phoneRequired': 'Please enter a contact number.',
    'booking.phoneInvalid': 'Use a valid phone number with country code, e.g. +60123456789.',
    'booking.quantityMin': '{label} must be at least 1.',
    'booking.modeRequired': 'Please select a booking mode.',
    'booking.ticketRequired': 'Please select a ticket category.',
    'confirm.badge': 'PIC Confirmation',
    'confirm.title': 'Review Booking Details',
    'confirm.description': 'Confirm the booking after verifying the details below.',
    'confirm.status': 'Booking status',
    'confirm.submitted': 'Submitted {date}',
    'confirm.alreadyConfirmed': 'Booking already confirmed',
    'confirm.confirmedOn': 'Confirmed on {date}.',
    'confirm.guestOrganizer': 'Guest / Organizer',
    'confirm.contactNumber': 'Contact Number',
    'confirm.pic': 'Person In Charge',
    'confirm.picPhone': 'PIC Phone',
    'confirm.ticketCategory': 'Ticket Category',
    'confirm.seatsCovered': 'Seats Covered',
    'confirm.submittedLabel': 'Submitted',
    'confirm.confirmedAt': 'Confirmed At',
    'confirm.backToForm': 'Back To Booking Form',
    'confirm.openReceipt': 'Open Ticket Receipt',
    'confirm.confirmBooking': 'Confirm This Booking',
    'confirm.cancelConfirmation': 'Cancel Confirmation',
    'confirm.alreadyConfirmedToast': 'Booking already confirmed',
    'confirm.confirmedToast': 'Booking confirmed',
    'confirm.alreadyConfirmedDescription': 'This booking had already been confirmed earlier.',
    'confirm.receiptSent': 'Ticket receipt was sent to {phone}.',
    'confirm.receiptNotSent': 'Booking confirmed, but the ticket receipt WhatsApp was not sent: {error}',
    'confirm.failed': 'Confirmation failed',
    'confirm.cancelPrompt': 'Cancel this confirmation? The booking will return to pending and the seats will be released.',
    'confirm.alreadyPending': 'Booking already pending',
    'confirm.cancelled': 'Confirmation cancelled',
    'confirm.alreadyPendingDescription': 'This booking was already pending confirmation.',
    'confirm.cancelledDescription': 'The booking has been returned to pending status.',
    'confirm.cancelFailed': 'Cancellation failed',
    'receipt.badge': 'Ticket Receipt',
    'receipt.mainQr': 'Main QR',
    'receipt.seatList': 'Seat List',
    'receipt.shareSeats': 'Share Seats',
    'receipt.batchShare': 'Batch Share',
    'receipt.shared': 'shared',
    'receipt.available': 'available',
    'receipt.seatDetail': 'Seat Detail',
    'receipt.openLink': 'Open Link',
    'receipt.share': 'Share',
    'receipt.sharedStatus': 'Shared',
    'receipt.availableStatus': 'Available',
    'receipt.unassigned': 'Unassigned',
    'receipt.readyToShare': 'Ready to share',
    'receipt.sharedAt': 'Shared {date}',
    'receipt.openSeatLink': 'Open seat link',
    'receipt.shareSeat': 'Share seat',
    'receipt.unshareSeat': 'Unshare seat',
    'receipt.unshare': 'Unshare',
    'receipt.batchTitle': 'Batch Share Seats',
    'receipt.seatsToShare': 'Seats To Share',
    'receipt.nextSeats': 'Next Seats',
    'receipt.noSeatsAvailable': 'No seats available',
    'receipt.recipientName': 'Recipient Name',
    'receipt.recipientPhone': 'Recipient Phone',
    'receipt.optional': 'Optional',
    'receipt.optionalPhonePlaceholder': 'Optional, e.g. +60123456789',
    'receipt.recipient': 'Recipient',
    'receipt.recipientPhoneLabel': 'Recipient Phone',
    'receipt.guest': 'Guest',
    'receipt.seatsReady': 'Seats ready',
    'receipt.seatsReadyDescription': '{count} {seatLabel} ready to send.',
    'receipt.copied': 'Copied to clipboard.',
    'receipt.copyPrompt': 'Copy this text',
    'receipt.seatUpdateFailed': 'Seat update failed',
    'receipt.seatUpdateFailedDescription': 'The share sheet opened, but the seat records could not be updated.',
    'receipt.seatsShared': '{count} {seatLabel} shared',
    'receipt.allSeatsSent': 'Next available seats were sent.',
    'receipt.someSeatsFailed': 'Some seats were sent, but at least one update failed.',
    'receipt.unableShareSeats': 'Unable to share seats',
    'receipt.seatReady': 'Seat ready',
    'receipt.seatReadyDescription': '{seat} is ready to send.',
    'receipt.seatShared': '{seat} shared',
    'receipt.unableShareSeat': 'Unable to share seat',
    'receipt.unsharePrompt': 'Unshare {seat}? The previous link will stop working.',
    'receipt.seatUnshared': '{seat} unshared',
    'receipt.unableUnshareSeat': 'Unable to unshare seat',
    'login.badge': 'Staff Access',
    'login.title': 'Login to the management system',
    'login.username': 'Username',
    'login.usernamePlaceholder': 'Enter your username',
    'login.password': 'Password',
    'login.passwordPlaceholder': 'Enter your password',
    'login.remember': 'Remember this device',
    'login.signIn': 'Sign In',
    'login.or': 'or',
    'login.passkey': 'Sign In With Passkey',
    'login.usernameRequired': 'Please enter your username.',
    'login.passwordRequired': 'Please enter your password.',
    'login.failed': 'Login failed',
    'login.failedDescription': 'Unable to sign in with username and password.',
    'login.passkeyFailed': 'Passkey login failed',
    'login.passkeyFailedDescription': 'Unable to complete passkey login.',
    'date.notAvailable': 'Not available'
  },
  zh: {
    'common.back': '返回',
    'common.cancel': '取消',
    'common.category': '类别',
    'common.date': '日期',
    'common.login': '登录',
    'common.logout': '退出登录',
    'common.menu': '菜单',
    'common.close': '关闭',
    'common.open': '打开',
    'common.phoneNumber': '联络号码',
    'common.price': '价格',
    'common.public': '公开页面',
    'common.refresh': '刷新',
    'common.seats': '座位',
    'common.status': '状态',
    'common.time': '时间',
    'common.totalPrice': '总价',
    'common.venue': '地点',
    'common.switchLanguage': '切换语言',
    'common.language': '语言',
    'layout.brand': '晚宴票券系统',
    'layout.footer': '© 2026 DAP 60周年委员会。版权所有。',
    'layout.signedOut': '已退出登录',
    'layout.sessionCleared': '您的登录会话已清除。',
    'layout.logoutFailed': '退出登录失败',
    'layout.logoutFailedDescription': '无法结束当前会话。',
    'nav.bookings': '预订',
    'nav.security': '安全设置',
    'nav.users': '用户',
    'role.superAdmin': '超级管理员',
    'role.staff': '职员',
    'booking.name': '姓名',
    'booking.namePlaceholder': '例如：陈大文',
    'booking.phonePlaceholder': '例如：+60123456789',
    'booking.bookingMode': '预订方式',
    'booking.quantity': '数量',
    'booking.ticketCategory': '票券类别',
    'booking.personInCharge': '负责人',
    'booking.bookNow': '立即预订',
    'booking.seatGeneration': '此预订将生成 {count} 个{seatLabel}。',
    'booking.noPicTitle': '没有可用负责人',
    'booking.noPicDescription': '请先在管理页面新增一个有电话号码的用户。',
    'booking.whatsappOpened': 'WhatsApp 预订草稿已打开',
    'booking.whatsappOpenedDescription': '预订详情和确认链接已发送给 {name}。',
    'booking.createFailed': '无法创建预订',
    'booking.tryAgain': '请稍后再试。',
    'booking.nameRequired': '请输入宾客或订桌人姓名。',
    'booking.phoneRequired': '请输入联络号码。',
    'booking.phoneInvalid': '请输入包含国家区号的有效号码，例如 +60123456789。',
    'booking.quantityMin': '{label} 至少为 1。',
    'booking.modeRequired': '请选择预订方式。',
    'booking.ticketRequired': '请选择票券类别。',
    'confirm.badge': '负责人确认',
    'confirm.title': '检查预订详情',
    'confirm.description': '请核对以下资料后确认预订。',
    'confirm.status': '预订状态',
    'confirm.submitted': '提交于 {date}',
    'confirm.alreadyConfirmed': '预订已确认',
    'confirm.confirmedOn': '确认于 {date}。',
    'confirm.guestOrganizer': '宾客 / 订桌人',
    'confirm.contactNumber': '联络号码',
    'confirm.pic': '负责人',
    'confirm.picPhone': '负责人电话',
    'confirm.ticketCategory': '票券类别',
    'confirm.seatsCovered': '座位数量',
    'confirm.submittedLabel': '提交时间',
    'confirm.confirmedAt': '确认时间',
    'confirm.backToForm': '返回预订表格',
    'confirm.openReceipt': '打开票券收据',
    'confirm.confirmBooking': '确认此预订',
    'confirm.cancelConfirmation': '取消确认',
    'confirm.alreadyConfirmedToast': '预订已确认',
    'confirm.confirmedToast': '预订已确认',
    'confirm.alreadyConfirmedDescription': '此预订之前已经确认。',
    'confirm.receiptSent': '票券收据已发送至 {phone}。',
    'confirm.receiptNotSent': '预订已确认，但 WhatsApp 票券收据未发送：{error}',
    'confirm.failed': '确认失败',
    'confirm.cancelPrompt': '确定取消此确认？预订会回到待确认状态，座位也会释放。',
    'confirm.alreadyPending': '预订已是待确认',
    'confirm.cancelled': '已取消确认',
    'confirm.alreadyPendingDescription': '此预订已经处于待确认状态。',
    'confirm.cancelledDescription': '预订已回到待确认状态。',
    'confirm.cancelFailed': '取消失败',
    'receipt.badge': '票券收据',
    'receipt.mainQr': '主二维码',
    'receipt.seatList': '座位列表',
    'receipt.shareSeats': '分享座位',
    'receipt.batchShare': '批量分享',
    'receipt.shared': '已分享',
    'receipt.available': '可分享',
    'receipt.seatDetail': '座位详情',
    'receipt.openLink': '打开链接',
    'receipt.share': '分享',
    'receipt.sharedStatus': '已分享',
    'receipt.availableStatus': '可分享',
    'receipt.unassigned': '未指定',
    'receipt.readyToShare': '可分享',
    'receipt.sharedAt': '分享于 {date}',
    'receipt.openSeatLink': '打开座位链接',
    'receipt.shareSeat': '分享座位',
    'receipt.unshareSeat': '取消分享座位',
    'receipt.unshare': '取消分享',
    'receipt.batchTitle': '批量分享座位',
    'receipt.seatsToShare': '要分享的座位',
    'receipt.nextSeats': '接下来的座位',
    'receipt.noSeatsAvailable': '没有可分享的座位',
    'receipt.recipientName': '接收人姓名',
    'receipt.recipientPhone': '接收人电话',
    'receipt.optional': '选填',
    'receipt.optionalPhonePlaceholder': '选填，例如 +60123456789',
    'receipt.recipient': '接收人',
    'receipt.recipientPhoneLabel': '接收人电话',
    'receipt.guest': '宾客',
    'receipt.seatsReady': '座位已准备好',
    'receipt.seatsReadyDescription': '{count} 个{seatLabel}已准备发送。',
    'receipt.copied': '已复制到剪贴板。',
    'receipt.copyPrompt': '复制这段文字',
    'receipt.seatUpdateFailed': '座位更新失败',
    'receipt.seatUpdateFailedDescription': '分享面板已打开，但座位记录无法更新。',
    'receipt.seatsShared': '已分享 {count} 个{seatLabel}',
    'receipt.allSeatsSent': '接下来的可用座位已发送。',
    'receipt.someSeatsFailed': '部分座位已发送，但至少一个座位更新失败。',
    'receipt.unableShareSeats': '无法分享座位',
    'receipt.seatReady': '座位已准备好',
    'receipt.seatReadyDescription': '{seat} 已准备发送。',
    'receipt.seatShared': '{seat} 已分享',
    'receipt.unableShareSeat': '无法分享座位',
    'receipt.unsharePrompt': '确定取消分享 {seat}？旧链接将无法继续使用。',
    'receipt.seatUnshared': '{seat} 已取消分享',
    'receipt.unableUnshareSeat': '无法取消分享座位',
    'login.badge': '职员入口',
    'login.title': '登录管理系统',
    'login.username': '用户名',
    'login.usernamePlaceholder': '请输入用户名',
    'login.password': '密码',
    'login.passwordPlaceholder': '请输入密码',
    'login.remember': '记住此设备',
    'login.signIn': '登录',
    'login.or': '或',
    'login.passkey': '使用 Passkey 登录',
    'login.usernameRequired': '请输入用户名。',
    'login.passwordRequired': '请输入密码。',
    'login.failed': '登录失败',
    'login.failedDescription': '无法使用用户名和密码登录。',
    'login.passkeyFailed': 'Passkey 登录失败',
    'login.passkeyFailedDescription': '无法完成 Passkey 登录。',
    'date.notAvailable': '无资料'
  }
} as const

type MessageKey = keyof typeof messages.en
type MessageParams = Record<string, string | number | null | undefined>

function interpolate(message: string, params?: MessageParams) {
  if (!params) {
    return message
  }

  return message.replace(/\{(\w+)\}/g, (_, key: string) => String(params[key] ?? ''))
}

export function useLocale() {
  const localeCookie = useCookie<AppLocale | null>('dts-locale', {
    sameSite: 'lax'
  })
  const requestHeaders = import.meta.server ? useRequestHeaders(['accept-language']) : {}
  const locale = useState<AppLocale>('dts-locale', () => resolveLocale(
    localeCookie.value || requestHeaders['accept-language'],
    DEFAULT_LOCALE
  ))

  if (import.meta.client && !localeCookie.value) {
    locale.value = resolveLocale(navigator.language, locale.value)
  }

  localeCookie.value = locale.value

  function setLocale(nextLocale: string) {
    locale.value = resolveLocale(nextLocale, locale.value)
    localeCookie.value = locale.value
  }

  function toggleLocale() {
    setLocale(getOppositeLocale(locale.value))
  }

  function t(key: MessageKey, params?: MessageParams) {
    const message = messages[locale.value][key] || messages.en[key] || key
    return interpolate(message, params)
  }

  const localeOptions = LOCALE_OPTIONS
  const currentLocaleOption = computed(() => {
    return localeOptions.find((option) => option.value === locale.value) || localeOptions[0]
  })

  return {
    locale,
    localeOptions,
    currentLocaleOption,
    setLocale,
    toggleLocale,
    t
  }
}