using Microsoft.AspNetCore.Mvc;
using Dapper;
using WebClientTpos.Server.Infrastructure;
using WebClientTpos.Server.Models;

namespace WebClientTpos.Server.Controllers;

/// <summary>
/// EN: Shop management controller — CRUD for shops, settings, stats, and devices.
///     All endpoints are scoped to the current merchant's shops.
/// VI: Controller quản lý cửa hàng — CRUD cho shops, settings, stats và devices.
///     Tất cả endpoints đều lọc theo shops của merchant hiện tại.
/// </summary>
[ApiController]
[Route("api/bff")]
public class ShopController : ControllerBase
{
    private readonly TenantContext _tenant;
    private readonly BffDbConnectionFactory _dbFactory;

    public ShopController(TenantContext tenant, BffDbConnectionFactory dbFactory)
    {
        _tenant = tenant;
        _dbFactory = dbFactory;
    }

    /// <summary>
    /// EN: Get all shops belonging to the current merchant.
    /// VI: Lấy tất cả cửa hàng thuộc merchant hiện tại.
    /// </summary>
    [HttpGet("shops")]
    public async Task<IActionResult> GetShops()
    {
        var merchantId = await _tenant.GetMerchantIdAsync();
        if (merchantId == null)
            return Ok(Array.Empty<object>());

        await using var conn = _dbFactory.CreateConnection("merchant_service");
        var shops = await conn.QueryAsync<dynamic>(
            @"SELECT s.id, s.name, s.slug, s.description, s.phone, s.email,
                     s.open_time, s.close_time, s.features_config,
                     bc.name as category, st.name as status
              FROM shops s
              JOIN business_categories bc ON s.category_id = bc.id
              JOIN shop_statuses st ON s.status_id = st.id
              WHERE s.merchant_id = @MerchantId AND s.is_deleted = false
              ORDER BY s.name",
            new { MerchantId = merchantId });
        return Ok(shops);
    }

    /// <summary>
    /// EN: Get shop by ID — validates merchant ownership.
    /// VI: Lấy cửa hàng theo ID — kiểm tra quyền sở hữu merchant.
    /// </summary>
    [HttpGet("shops/{shopId:guid}")]
    public async Task<IActionResult> GetShopById(Guid shopId)
    {
        var merchantId = await _tenant.GetMerchantIdAsync();
        if (merchantId == null)
            return NotFound(new { message = "Shop not found" });

        await using var conn = _dbFactory.CreateConnection("merchant_service");
        var shop = await conn.QueryFirstOrDefaultAsync<dynamic>(
            @"SELECT s.id, s.name, s.slug, s.description, s.phone, s.email,
                     s.open_time, s.close_time,
                     bc.name as category, st.name as status
              FROM shops s
              JOIN business_categories bc ON s.category_id = bc.id
              JOIN shop_statuses st ON s.status_id = st.id
              WHERE s.id = @ShopId AND s.merchant_id = @MerchantId AND s.is_deleted = false",
            new { ShopId = shopId, MerchantId = merchantId });

        if (shop == null)
            return NotFound(new { message = "Shop not found" });

        return Ok(shop);
    }

    /// <summary>
    /// EN: Update shop info — validates ownership.
    /// VI: Cập nhật thông tin cửa hàng — kiểm tra quyền sở hữu.
    /// </summary>
    [HttpPut("shops/{shopId:guid}")]
    public async Task<IActionResult> UpdateShop(Guid shopId, [FromBody] UpdateShopRequest req)
    {
        var merchantId = await _tenant.GetMerchantIdAsync();
        if (merchantId == null) return Unauthorized();

        var myShopIds = await _tenant.GetShopIdsAsync();
        if (!myShopIds.Contains(shopId))
            return Forbid();

        await using var conn = _dbFactory.CreateConnection("merchant_service");
        var rows = await conn.ExecuteAsync(
            @"UPDATE shops SET name=@Name, phone=@Phone, email=@Email, description=@Description,
                     open_time=@OpenTime, close_time=@CloseTime, updated_at=NOW()
              WHERE id=@ShopId AND id = ANY(@ShopIds)",
            new { req.Name, req.Phone, req.Email, req.Description,
                  req.OpenTime, req.CloseTime, ShopId = shopId, ShopIds = myShopIds.ToArray() });
        return rows > 0 ? Ok(new { id = shopId }) : NotFound();
    }

    /// <summary>
    /// EN: Get shop settings (features_config, open/close time, open days).
    /// VI: Lấy cài đặt cửa hàng (features_config, giờ mở/đóng cửa, ngày mở cửa).
    /// </summary>
    [HttpGet("shops/{shopId:guid}/settings")]
    public async Task<IActionResult> GetShopSettings(Guid shopId)
    {
        var merchantId = await _tenant.GetMerchantIdAsync();
        if (merchantId == null) return NotFound();

        await using var conn = _dbFactory.CreateConnection("merchant_service");
        var settings = await conn.QueryFirstOrDefaultAsync<dynamic>(
            @"SELECT features_config::text as features_config,
                     open_time::text as open_time,
                     close_time::text as close_time,
                     open_days
              FROM shops
              WHERE id = @ShopId AND merchant_id = @MerchantId AND is_deleted = false",
            new { ShopId = shopId, MerchantId = merchantId });

        if (settings == null) return NotFound();
        return Ok(settings);
    }

    /// <summary>
    /// EN: Update shop settings — validates ownership.
    /// VI: Cập nhật cài đặt cửa hàng — kiểm tra quyền sở hữu.
    /// </summary>
    [HttpPut("shops/{shopId:guid}/settings")]
    public async Task<IActionResult> UpdateShopSettings(Guid shopId, [FromBody] UpdateShopSettingsRequest req)
    {
        var merchantId = await _tenant.GetMerchantIdAsync();
        if (merchantId == null) return Unauthorized();

        var myShopIds = await _tenant.GetShopIdsAsync();
        if (!myShopIds.Contains(shopId)) return Forbid();

        await using var conn = _dbFactory.CreateConnection("merchant_service");
        try
        {
            await conn.ExecuteAsync(
                @"UPDATE shops
                  SET features_config = @FeaturesConfig::jsonb,
                      open_time       = @OpenTime::time,
                      close_time      = @CloseTime::time,
                      open_days       = @OpenDays,
                      updated_at      = NOW()
                  WHERE id = @ShopId AND id = ANY(@ShopIds)",
                new
                {
                    ShopId   = shopId,
                    ShopIds  = myShopIds.ToArray(),
                    FeaturesConfig = string.IsNullOrWhiteSpace(req.FeaturesConfig) ? "{}" : req.FeaturesConfig,
                    OpenTime = string.IsNullOrWhiteSpace(req.OpenTime)  ? (object)DBNull.Value : req.OpenTime,
                    CloseTime= string.IsNullOrWhiteSpace(req.CloseTime) ? (object)DBNull.Value : req.CloseTime,
                    OpenDays = req.OpenDays
                });
            return Ok(new { success = true });
        }
        catch (Exception ex) { return BadRequest(new { error = ex.Message }); }
    }

    /// <summary>
    /// EN: Get aggregated stats per shop — scoped to current merchant.
    /// VI: Lấy thống kê tổng hợp theo shop — lọc theo merchant hiện tại.
    /// </summary>
    [HttpGet("shops/stats")]
    public async Task<IActionResult> GetShopStats()
    {
        var merchantId = await _tenant.GetMerchantIdAsync();
        if (merchantId == null)
            return Ok(Array.Empty<object>());

        var myShopIds = await _tenant.GetShopIdsAsync();
        if (!myShopIds.Any())
            return Ok(Array.Empty<object>());

        var shopIdsArray = myShopIds.ToArray();

        // EN: Products per shop (scoped) / VI: Số sản phẩm mỗi shop
        Dictionary<Guid, int> productCounts = new();
        try
        {
            await using var catConn = _dbFactory.CreateConnection("catalog_service");
            var prodStats = await catConn.QueryAsync<dynamic>(
                "SELECT shop_id, COUNT(*) as cnt FROM products WHERE is_active = true AND shop_id = ANY(@ShopIds) GROUP BY shop_id",
                new { ShopIds = shopIdsArray });
            foreach (var ps in prodStats)
                productCounts[(Guid)ps.shop_id] = (int)(long)ps.cnt;
        }
        catch { /* catalog_service may not have data yet */ }

        // EN: Orders per shop + revenue (scoped) / VI: Số đơn + doanh thu mỗi shop
        Dictionary<Guid, int> orderCounts = new();
        Dictionary<Guid, decimal> revenues = new();
        try
        {
            await using var orderConn = _dbFactory.CreateConnection("order_service");
            var orderStats = await orderConn.QueryAsync<dynamic>(
                "SELECT shop_id, COUNT(*) as cnt, COALESCE(SUM(total_amount), 0) as revenue FROM orders WHERE shop_id = ANY(@ShopIds) GROUP BY shop_id",
                new { ShopIds = shopIdsArray });
            foreach (var os in orderStats)
            {
                orderCounts[(Guid)os.shop_id] = (int)(long)os.cnt;
                revenues[(Guid)os.shop_id] = (decimal)os.revenue;
            }
        }
        catch { /* order_service may not have data yet */ }

        // EN: Staff per shop (scoped) / VI: Số nhân viên mỗi shop
        Dictionary<Guid, int> staffCounts = new();
        try
        {
            await using var mConn = _dbFactory.CreateConnection("merchant_service");
            var staffStats = await mConn.QueryAsync<dynamic>(
                @"SELECT sm.shop_id, COUNT(DISTINCT sm.staff_id) as cnt
                  FROM shop_members sm
                  JOIN merchant_staff ms ON sm.staff_id = ms.id
                  JOIN staff_statuses ss ON ms.status_id = ss.id
                  WHERE ss.name = 'Active' AND sm.shop_id = ANY(@ShopIds)
                  GROUP BY sm.shop_id",
                new { ShopIds = shopIdsArray });
            foreach (var ss in staffStats)
                staffCounts[(Guid)ss.shop_id] = (int)(long)ss.cnt;
        }
        catch { /* merchant_service may not have data yet */ }

        var result = myShopIds.Select(shopId => new
        {
            shop_id = shopId,
            product_count = productCounts.GetValueOrDefault(shopId, 0),
            order_count = orderCounts.GetValueOrDefault(shopId, 0),
            staff_count = staffCounts.GetValueOrDefault(shopId, 0),
            revenue = revenues.GetValueOrDefault(shopId, 0m)
        });

        return Ok(result);
    }

    /// <summary>
    /// EN: Get device tokens registered for this merchant's staff.
    /// VI: Lấy danh sách device token đã đăng ký cho nhân viên của merchant.
    /// </summary>
    [HttpGet("devices")]
    public async Task<IActionResult> GetDevices()
    {
        await using var conn = _dbFactory.CreateConnection("merchant_service");
        var devices = await conn.QueryAsync<dynamic>(
            @"SELECT dt.id, dt.device_token, dt.platform, dt.is_active, dt.created_at,
                     ms.employee_code as staff_code
              FROM device_tokens dt
              LEFT JOIN merchant_staff ms ON dt.staff_id = ms.id
              ORDER BY dt.created_at DESC");
        return Ok(devices);
    }
}