using Management.Data;
using Management.Security;
using Microsoft.AspNetCore.Mvc;
using System.Text.Json;

namespace Management.Controllers.Admin;

/// <summary>
/// Admin endpoint for manually triggering metric sync.
///
/// ENDPOINTS:
/// POST /api/admin/sync/metrics/{clientId}   - Sync a specific client
/// POST /api/admin/sync/metrics              - Sync all active clients
///
/// Proxies to Gateway /api/sync/metrics/* using an internal service key.
/// Gateway owns provider connectivity; Management owns the trigger surface.
/// Configure via GATEWAY_URL + INTERNAL_SERVICE_KEY env vars.
/// </summary>
[ApiController]
[Route("api/admin/sync")]
public sealed class AdminMetricSyncController : AdminControllerBase
{
    private readonly IHttpClientFactory _http;
    private readonly IConfiguration _config;

    public AdminMetricSyncController(
        SqlService sql,
        ClientContext client,
        ILogger<AdminMetricSyncController> log,
        IHttpClientFactory http,
        IConfiguration config)
        : base(sql, client, log)
    {
        _http   = http;
        _config = config;
    }

    /// <summary>
    /// Trigger metric sync for a specific client.
    /// </summary>
    [HttpPost("metrics/{clientId}")]
    public async Task<IActionResult> SyncClient(
        string clientId,
        [FromQuery] string? startDate,
        [FromQuery] string? endDate,
        CancellationToken ct)
    {
        Logger.LogInformation("[Admin] MetricSync triggered for client {ClientId} | By={User}",
            clientId, Client.Email);

        return await ProxyToGateway($"metrics/{Uri.EscapeDataString(clientId)}", startDate, endDate, ct);
    }

    /// <summary>
    /// Trigger metric sync for all active clients.
    /// </summary>
    [HttpPost("metrics")]
    public async Task<IActionResult> SyncAll(
        [FromQuery] string? startDate,
        [FromQuery] string? endDate,
        CancellationToken ct)
    {
        Logger.LogInformation("[Admin] MetricSync ALL clients triggered | By={User}", Client.Email);

        return await ProxyToGateway("metrics/all", startDate, endDate, ct);
    }

    // ────────────────────────────────────────────────
    // Proxy helper
    // ────────────────────────────────────────────────

    private async Task<IActionResult> ProxyToGateway(
        string path, string? startDate, string? endDate, CancellationToken ct)
    {
        var gatewayUrl = _config["GATEWAY_URL"]?.TrimEnd('/');
        var serviceKey = _config["INTERNAL_SERVICE_KEY"];

        if (string.IsNullOrWhiteSpace(gatewayUrl))
            return StatusCode(500, new { ok = false, error = "GATEWAY_URL not configured" });
        if (string.IsNullOrWhiteSpace(serviceKey))
            return StatusCode(500, new { ok = false, error = "INTERNAL_SERVICE_KEY not configured" });

        var qs = new List<string>();
        if (!string.IsNullOrWhiteSpace(startDate)) qs.Add($"startDate={Uri.EscapeDataString(startDate)}");
        if (!string.IsNullOrWhiteSpace(endDate))   qs.Add($"endDate={Uri.EscapeDataString(endDate)}");

        var url = $"{gatewayUrl}/api/sync/{path}";
        if (qs.Count > 0) url += "?" + string.Join("&", qs);

        try
        {
            var client = _http.CreateClient();
            using var req = new HttpRequestMessage(HttpMethod.Post, url);
            req.Headers.Add("X-Service-Key", serviceKey);

            using var resp = await client.SendAsync(req, ct);
            var body = await resp.Content.ReadAsStringAsync(ct);

            Logger.LogInformation("[Admin] MetricSync Gateway response {Status} | Path={Path}",
                (int)resp.StatusCode, path);

            return resp.IsSuccessStatusCode
                ? Content(body, "application/json")
                : StatusCode((int)resp.StatusCode, new { ok = false, error = $"Gateway returned {(int)resp.StatusCode}", detail = body });
        }
        catch (Exception ex)
        {
            Logger.LogError(ex, "[Admin] MetricSync proxy error | Path={Path}", path);
            return StatusCode(500, new { ok = false, error = "Sync trigger failed", detail = ex.Message });
        }
    }
}