using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using LingAdmin.API.Data;
using LingAdmin.API.Models;
using LingAdmin.API.DTOs;
using System.Text.Json;

namespace LingAdmin.API.Controllers;

[ApiController]
[Route("api/i18n")]
public class I18nController : ControllerBase
{
    private readonly AppDbContext _context;
    private readonly ILogger<I18nController> _logger;

    public I18nController(AppDbContext context, ILogger<I18nController> logger)
    {
        _context = context;
        _logger = logger;
    }

    [HttpGet("manifest")]
    public async Task<ActionResult<ApiResponse<object>>> GetManifest()
    {
        try
        {
            var languages = await _context.Languages
                .Select(l => new { code = l.Code, name = l.Name, version = l.Version })
                .ToListAsync();

            var manifest = new { languages };
            return Ok(ApiResponse<object>.Success(manifest));
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error retrieving i18n manifest");
            return StatusCode(500, ApiResponse<object>.Error("Internal server error", 500));
        }
    }

    [HttpGet("lang/{languageCode}")]
    public async Task<ActionResult<ApiResponse<object>>> GetLanguage(string languageCode)
    {
        try
        {
            // For simplicity, returning static translations
            // In production, you'd want to store these in the database
            var translations = languageCode.ToLower() switch
            {
                "en-us" => GetEnglishTranslations(),
                "zh-cn" => GetChineseTranslations(),
                _ => null
            };

            if (translations == null)
            {
                return NotFound(ApiResponse<object>.Error("Language not found", 404));
            }

            return Ok(ApiResponse<object>.Success(translations));
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error retrieving language {LanguageCode}", languageCode);
            return StatusCode(500, ApiResponse<object>.Error("Internal server error", 500));
        }
    }

    private object GetEnglishTranslations()
    {
        return new
        {
            common = new
            {
                login = "Sign in",
                loginDesc = "Enter your email below to login to your account",
                email = "Email",
                password = "Password",
                submitLogin = "Sign In",
                loggingIn = "Signing in...",
                loginFailed = "Login failed. Please check your credentials.",
                logout = "Logout",
                dashboard = "Dashboard",
                users = "Users",
                settings = "Settings",
                requisitions = "Requisitions"
            },
            menu = new
            {
                dashboard = "Dashboard",
                users = "Users",
                settings = "Settings",
                requisitions = "Requisitions"
            },
            dashboard = new
            {
                title = "Dashboard",
                totalRevenue = "Total Revenue",
                subscriptions = "Subscriptions",
                sales = "Sales",
                activeNow = "Active Now"
            },
            users = new
            {
                title = "Users",
                refresh = "Refresh Data",
                name = "Name",
                status = "Status",
                createdAt = "Created At"
            },
            settings = new
            {
                title = "Settings",
                desc = "System settings will be here."
            },
            requisitions = new
            {
                title = "Purchase Requisitions",
                listTitle = "Requisition List",
                create = "Create Requisition",
                edit = "Edit Requisition",
                id = "ID",
                reqNo = "Request No",
                requester = "Requester",
                department = "Department",
                date = "Date",
                status = "Status",
                description = "Description",
                items = "Items",
                itemName = "Item Name",
                quantity = "Quantity",
                price = "Price",
                total = "Total",
                actions = "Actions",
                addItem = "Add Item",
                save = "Save",
                cancel = "Cancel",
                delete = "Delete"
            }
        };
    }

    private object GetChineseTranslations()
    {
        return new
        {
            common = new
            {
                login = "登录",
                loginDesc = "请输入您的邮箱登录账户",
                email = "邮箱",
                password = "密码",
                submitLogin = "登录",
                loggingIn = "登录中...",
                loginFailed = "登录失败，请检查您的凭据。",
                logout = "退出登录",
                dashboard = "仪表盘",
                users = "用户管理",
                settings = "系统设置",
                requisitions = "请购单"
            },
            menu = new
            {
                dashboard = "仪表盘",
                users = "用户管理",
                settings = "系统设置",
                requisitions = "请购单"
            },
            dashboard = new
            {
                title = "仪表盘",
                totalRevenue = "总收入",
                subscriptions = "订阅数",
                sales = "销售额",
                activeNow = "当前在线"
            },
            users = new
            {
                title = "用户管理",
                refresh = "刷新数据",
                name = "姓名",
                status = "状态",
                createdAt = "创建时间"
            },
            settings = new
            {
                title = "系统设置",
                desc = "这里将显示系统设置内容。"
            },
            requisitions = new
            {
                title = "请购单",
                listTitle = "请购单列表",
                create = "新建请购单",
                edit = "编辑请购单",
                id = "ID",
                reqNo = "单号",
                requester = "申请人",
                department = "部门",
                date = "日期",
                status = "状态",
                description = "描述",
                items = "明细项",
                itemName = "物品名称",
                quantity = "数量",
                price = "单价",
                total = "总价",
                actions = "操作",
                addItem = "添加明细",
                save = "保存",
                cancel = "取消",
                delete = "删除"
            }
        };
    }
}