#pragma once

#include <cstring>
#include <string>

#include "common/protocol_def.h"

namespace im {
namespace i18n {

// 语言：由 Client 连接后 SetConfig 下发，存于 Session；客户端写死上报值与兜底文案
enum class Lang {
    Zh = 0,
    En = 1,
};

// 回包 msg / 客户端兜底文案的键
enum class Msg {
    Ok = 0,
    Kicked,
    InvalidJson,
    NotLogin,
    UidPasswordRequired,
    UidOrPasswordIncorrect,
    AccountDisabled,
    SystemAccount,
    IncompleteRegisterInfo,
    NicknameTooLong,
    BadAccountFormat,
    WeakPassword,
    InvalidPhone,
    AccountExists,
    PhoneExists,
    BadSms,
    RegisterFailed,
    SceneMustBeRegisterOrReset,
    PhoneNotRegistered,
    SmsTooFrequent,
    SmsSendFailed,
    IncompleteResetInfo,
    UserNotFound,
    PhoneMismatch,
    AccountNotAllowed,
    OldPasswordRequired,
    OldPasswordIncorrect,
    ToUidContentRequired,
    ContentTooLong,
    PeerUidRequired,
    UidRequired,
    CannotAddYourself,
    AlreadyFriends,
    FriendRequestSent,
    AddFriendNotAllowed,
    FriendRequestPending,
    FriendRequestMessageTooLong,
    SearchKeywordRequired,
    StickerNotFound,
    DbError,
    BadParam,
    RequestFailed,
    NotFriends,
    RemarkTooLong,
    FileTooLarge,
    FileNotFound,
    AvatarInvalid,
    SignatureTooLong,
    CannotOperateSystemFriend,
    FavoriteNotFound,
    FavoriteContentTooLong,
    GroupNotFound,
    GroupNameRequired,
    GroupNameTooLong,
    NotGroupMember,
    GroupNoPermission,
    GroupFull,
    JoinNotAllowed,
    AlreadyInGroup,
    OwnerCannotLeave,
    GroupNeedMembers,
    GroupRequestSent,
    GroupRequestPending,
    GroupAdminFull,
    CannotKickOwner,
    GroupIdRequired,
    _Count
};

namespace detail {

struct Entry {
    const char* zh;
    const char* en;
};

inline Lang& current()
{
    static Lang g = Lang::Zh;
    return g;
}

inline const Entry& table(Msg id)
{
    static const Entry k[static_cast<int>(Msg::_Count)] = {
        {"成功", "OK"},
        {"账号已在其他设备登录", "Signed in on another device"},
        {"请求数据无效", "Invalid request data"},
        {"未登录", "Not logged in"},
        {"请输入账号和密码", "Account and password required"},
        {"账号或密码错误", "Incorrect account or password"},
        {"账号已禁用", "Account disabled"},
        {"系统账号不可登录", "System account"},
        {"注册信息不完整", "Incomplete register info"},
        {"昵称过长", "Nickname too long"},
        {"账号须为4-16位字母或数字", "Account must be 4-16 letters or digits"},
        {"密码须为6-20个字符", "Password must be 6-20 characters"},
        {"手机号无效", "Invalid phone number"},
        {"账号已存在", "Account already exists"},
        {"手机号已注册", "Phone already registered"},
        {"验证码错误或已过期", "Invalid or expired SMS code"},
        {"注册失败", "Register failed"},
        {"场景须为 register 或 reset", "Scene must be register or reset"},
        {"手机号未注册", "Phone not registered"},
        {"验证码发送过于频繁", "SMS too frequent"},
        {"短信发送失败", "SMS send failed"},
        {"重置信息不完整", "Incomplete reset info"},
        {"用户不存在", "User not found"},
        {"手机号与账号不匹配", "Phone mismatch"},
        {"账号不允许此操作", "Account not allowed"},
        {"请输入原密码和新密码", "Old password and password required"},
        {"原密码错误", "Old password incorrect"},
        {"请指定接收方和消息内容", "to_uid and content required"},
        {"消息内容过长", "Content too long"},
        {"请指定会话对方", "peer_uid required"},
        {"请指定用户", "uid required"},
        {"不能添加自己为好友", "Cannot add yourself"},
        {"已经是好友", "Already friends"},
        {"好友申请已发送，等待对方同意", "Friend request sent, waiting for approval"},
        {"对方不允许添加好友", "This user does not accept friend requests"},
        {"已发送过申请，请等待对方处理", "Request already sent"},
        {"验证信息过长", "Verification message too long"},
        {"请输入账号或手机号", "Account or phone required"},
        {"表情不存在", "Sticker not found"},
        {"服务暂时不可用", "Service temporarily unavailable"},
        {"参数错误", "Invalid parameter"},
        {"请求失败", "Request failed"},
        {"还不是好友", "Not friends"},
        {"备注过长", "Remark too long"},
        {"文件过大", "File too large"},
        {"文件不存在", "File not found"},
        {"头像无效", "Invalid avatar"},
        {"签名过长", "Signature too long"},
        {"系统账号不支持此操作", "System account does not support this action"},
        {"收藏不存在", "Favorite not found"},
        {"收藏内容过长", "Favorite content too long"},
        {"群聊不存在", "Group not found"},
        {"请输入群名称", "Group name required"},
        {"群名称过长", "Group name too long"},
        {"你不是群成员", "Not a group member"},
        {"没有权限", "No permission"},
        {"群人数已满", "Group is full"},
        {"该群不允许加入", "This group does not allow joining"},
        {"已在群中", "Already in the group"},
        {"群主不能退群，请先转让或解散", "Owner cannot leave; transfer or dismiss first"},
        {"请至少选择一名好友", "Select at least one friend"},
        {"入群申请已发送", "Join request sent"},
        {"已发送过申请，请等待处理", "Request already sent"},
        {"管理员人数已满", "Too many admins"},
        {"不能移除群主", "Cannot remove the owner"},
        {"请指定群聊", "group_id required"},
    };
    const int i = static_cast<int>(id);
    if (i < 0 || i >= static_cast<int>(Msg::_Count)) {
        return k[static_cast<int>(Msg::RequestFailed)];
    }
    return k[i];
}

}  // namespace detail

inline Lang lang()
{
    return detail::current();
}

inline void set_lang(Lang l)
{
    detail::current() = l;
}

inline Lang parse_lang(const char* s)
{
    if (s == nullptr || s[0] == '\0') {
        return Lang::Zh;
    }
    if ((s[0] == 'e' || s[0] == 'E') && (s[1] == 'n' || s[1] == 'N')) {
        return Lang::En;
    }
    return Lang::Zh;
}

inline Lang parse_lang(const std::string& s)
{
    return parse_lang(s.c_str());
}

inline const char* text(Msg id, Lang l)
{
    const detail::Entry& e = detail::table(id);
    return l == Lang::En ? e.en : e.zh;
}

inline const char* text(Msg id)
{
    return text(id, lang());
}

// 按错误码兜底（客户端在服务端未带详细 msg 时使用）
inline Msg msg_of_err(int code)
{
    switch (code) {
    case Err::Ok:
        return Msg::Ok;
    case Err::BadParam:
        return Msg::BadParam;
    case Err::NotLogin:
        return Msg::NotLogin;
    case Err::AuthFail:
        return Msg::UidOrPasswordIncorrect;
    case Err::NotFound:
        return Msg::UserNotFound;
    case Err::Exists:
        return Msg::AccountExists;
    case Err::PhoneExists:
        return Msg::PhoneExists;
    case Err::BadSms:
        return Msg::BadSms;
    case Err::WeakPass:
        return Msg::WeakPassword;
    case Err::Forbidden:
        return Msg::AccountNotAllowed;
    case Err::DbError:
        return Msg::DbError;
    case Err::BadAccount:
        return Msg::BadAccountFormat;
    case Err::RateLimit:
        return Msg::SmsTooFrequent;
    case Err::Disabled:
        return Msg::AccountDisabled;
    default:
        return Msg::RequestFailed;
    }
}

inline const char* err_text(int code)
{
    return text(msg_of_err(code));
}

}  // namespace i18n
}  // namespace im