using Gateway.Security;
using Gateway.Services;
using Microsoft.AspNetCore.Mvc;

namespace Gateway.Controllers;

/// <summary>
/// Metric sync trigger — called by Management API or Azure Functions timer.
/// Pulls campaign performance data from provider containers and writes
/// it into the database, then triggers recommendation evaluation.
/// Secured by internal service key (X-Service-Key header).
/// </summary>
[ApiController]
[Route("api/sync")]
public sealed class MetricSyncController : ControllerBase
{
    private readonly MetricSyncService _sync;
    private readonly AuthorizationGuard _guard;
    private readonly ILogger<MetricSyncController> _log;

    public MetricSyncController(
        MetricSyncService sync,
        AuthorizationGuard guard,
        ILogger<MetricSyncController> log)
    {
        _sync = sync;
        _guard = guard;
        _log = log;
    }

    /// <summary>
    /// Sync metrics for a specific client.
    /// Pulls from all active channel campaign providers, writes to DB,
    /// then triggers recommendation evaluation.
    /// </summary>
    [HttpPost("metrics/{clientId}")]
    public async Task<IActionResult> SyncClient(
        string clientId,
        [FromQuery] string? startDate,
        [FromQuery] string? endDate,
        CancellationToken ct)
    {
        var (ok, err) = _guard.RequireServiceKey();
        if (!ok) return StatusCode(403, new { ok = false, error = err });

        _log.LogInformation("[MetricSync] Manual sync triggered for client {ClientId}", clientId);

        var result = await _sync.SyncClientMetricsAsync(clientId, startDate, endDate, ct);

        return Ok(new
        {
            ok = result.Success,
            clientId = result.ClientId,
            campaignsProcessed = result.CampaignsProcessed,
            metricsWritten = result.MetricsWritten,
            recommendationsGenerated = result.RecommendationsGenerated,
            skipped = result.Skipped,
            errors = result.Errors,
            error = result.Error
        });
    }
}