using IntelligenceApi.Engines;
using IntelligenceApi.Models;
using Microsoft.AspNetCore.Mvc;

namespace IntelligenceApi.Controllers;

/// <summary>
/// Demographics analysis endpoint.
///
/// Called exclusively by the Gateway's IntelligenceApiClient after it fetches
/// raw census data from the database. This container derives audience
/// recommendations from the raw data — age chips, income tiers, insights.
///
/// POST /api/demographics/analyze
/// </summary>
[ApiController]
[Route("api/demographics")]
public sealed class DemographicsController : ControllerBase
{
    private readonly DemographicsAnalyzer _analyzer;
    private readonly ILogger<DemographicsController> _log;

    public DemographicsController(DemographicsAnalyzer analyzer, ILogger<DemographicsController> log)
    {
        _analyzer = analyzer;
        _log      = log;
    }

    [HttpPost("analyze")]
    public IActionResult Analyze([FromBody] DemographicAnalysisRequest? request)
    {
        if (request == null || string.IsNullOrWhiteSpace(request.Zcta))
            return BadRequest(new { ok = false, error = "zcta and census data are required" });

        _log.LogInformation("[Demographics] Analyze | ZCTA={Zcta}", request.Zcta);

        try
        {
            var result = _analyzer.Analyze(request);
            return Ok(result);
        }
        catch (Exception ex)
        {
            _log.LogError(ex, "[Demographics] Analysis error | ZCTA={Zcta}", request.Zcta);
            return StatusCode(500, new { ok = false, error = "Demographics analysis error" });
        }
    }
}