using FlatRender.IdentitySvc.Application.Services;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;

namespace FlatRender.IdentitySvc.Controllers;

/// <summary>Service-to-service endpoints (render-svc → identity). Auth via shared service token,
/// reachable only on the internal network (the gateway does not route /v1/internal).</summary>
[ApiController]
[AllowAnonymous]
[Route("v1/internal")]
public class InternalController(AdminService svc, IConfiguration config) : ControllerBase
{
    public record ChargeReq(Guid UserId);

    private bool ServiceTokenValid()
    {
        var expected = config["ServiceToken"] ?? Environment.GetEnvironmentVariable("SERVICE_TOKEN") ?? "internal-service-secret";
        var got = Request.Headers["X-Service-Token"].ToString();
        if (string.IsNullOrEmpty(got))
        {
            var auth = Request.Headers["Authorization"].ToString();
            if (auth.StartsWith("Bearer ", StringComparison.Ordinal)) got = auth[7..];
        }
        return !string.IsNullOrEmpty(got) && got == expected;
    }

    [HttpPost("render-charge/consume")]
    public async Task<IActionResult> Consume([FromBody] ChargeReq req)
    {
        if (!ServiceTokenValid()) return Unauthorized();
        var (allowed, remaining) = await svc.ConsumeRenderChargeAsync(req.UserId);
        return Ok(new { allowed, remaining });
    }

    [HttpPost("render-charge/refund")]
    public async Task<IActionResult> Refund([FromBody] ChargeReq req)
    {
        if (!ServiceTokenValid()) return Unauthorized();
        await svc.RefundRenderChargeAsync(req.UserId);
        return Ok(new { ok = true });
    }
}