using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using System.Net.Http;
using System.Net.Http.Json;
using System.Text;
using System.Text.Json;
using System.Threading.Tasks;

namespace VolPro.Warehouse.Services;

/// <summary>
/// 网关 HTTP 客户端。封装 Vol.Pro 调用 IntegrationGateway B 组接口的逻辑。
/// 所有对网关的请求统一经此类发出，便于连接池管理和错误处理。
/// </summary>
public class GatewayClient
{
    private readonly IHttpClientFactory _httpFactory;
    private readonly IConfiguration _config;

    public GatewayClient(IHttpClientFactory httpFactory, IConfiguration config)
    {
        _httpFactory = httpFactory;
        _config = config;
    }

    /// <summary>创建带超时和默认头的 HttpClient</summary>
    private HttpClient CreateClient()
    {
        var client = _httpFactory.CreateClient("VolPro");
        client.Timeout = TimeSpan.FromSeconds(30);
        return client;
    }

    /// <summary>
    /// B3: 手动触发网关全量设备同步。
    /// POST {baseUrl}/api/gateway/devices/sync?adapter={adapterTypes}
    /// </summary>
    public async Task<JsonDocument?> TriggerFullSyncAsync(string baseUrl, string adapterTypes)
    {
        var http = CreateClient();
        var resp = await http.PostAsync(
            $"{baseUrl.TrimEnd('/')}/api/gateway/devices/sync?adapter={Uri.EscapeDataString(adapterTypes)}",
            null);
        if (!resp.IsSuccessStatusCode) return null;
        return await resp.Content.ReadFromJsonAsync<JsonDocument>();
    }

    /// <summary>
    /// B4: 获取设备实时点位值。
    /// GET {baseUrl}/api/gateway/realtime/{adapter}/{deviceId}
    /// </summary>
    public async Task<JsonDocument?> GetRealtimeAsync(string baseUrl, string adapter, string deviceId)
    {
        var http = CreateClient();
        var resp = await http.GetAsync(
            $"{baseUrl.TrimEnd('/')}/api/gateway/realtime/{Uri.EscapeDataString(adapter)}/{Uri.EscapeDataString(deviceId)}");
        if (!resp.IsSuccessStatusCode) return null;
        return await resp.Content.ReadFromJsonAsync<JsonDocument>();
    }

    /// <summary>
    /// B5: 设备反向控制。
    /// POST {baseUrl}/api/gateway/realtime/{adapter}/control
    /// </summary>
    public async Task<bool> ControlDeviceAsync(string baseUrl, string adapter, string deviceId, int pointIndex, double value)
    {
        var http = CreateClient();
        var resp = await http.PostAsJsonAsync(
            $"{baseUrl.TrimEnd('/')}/api/gateway/realtime/{adapter}/control",
            new { deviceId, pointIndex, value });
        return resp.IsSuccessStatusCode;
    }
}