using Microsoft.AspNetCore.Mvc;
using StellaOps.Policy.Engine.ConsoleExport;

namespace StellaOps.Policy.Engine.Endpoints;

/// <summary>
/// Endpoints for Console export jobs per CONTRACT-EXPORT-BUNDLE-009.
/// </summary>
public static class ConsoleExportEndpoints
{
    public static IEndpointRouteBuilder MapConsoleExportJobs(this IEndpointRouteBuilder routes)
    {
        var group = routes.MapGroup("/api/v1/export");

        // Job management
        group.MapPost("/jobs", CreateJobAsync)
            .WithName("Export.CreateJob")
            .WithDescription("Create a new export job");

        group.MapGet("/jobs", ListJobsAsync)
            .WithName("Export.ListJobs")
            .WithDescription("List export jobs");

        group.MapGet("/jobs/{jobId}", GetJobAsync)
            .WithName("Export.GetJob")
            .WithDescription("Get an export job by ID");

        group.MapPut("/jobs/{jobId}", UpdateJobAsync)
            .WithName("Export.UpdateJob")
            .WithDescription("Update an export job");

        group.MapDelete("/jobs/{jobId}", DeleteJobAsync)
            .WithName("Export.DeleteJob")
            .WithDescription("Delete an export job");

        // Job execution
        group.MapPost("/jobs/{jobId}/run", TriggerJobAsync)
            .WithName("Export.TriggerJob")
            .WithDescription("Trigger a job execution");

        group.MapGet("/jobs/{jobId}/executions/{executionId}", GetExecutionAsync)
            .WithName("Export.GetExecution")
            .WithDescription("Get execution status");

        // Bundle retrieval
        group.MapGet("/bundles/{bundleId}", GetBundleAsync)
            .WithName("Export.GetBundle")
            .WithDescription("Get bundle manifest");

        group.MapGet("/bundles/{bundleId}/download", DownloadBundleAsync)
            .WithName("Export.DownloadBundle")
            .WithDescription("Download bundle content");

        return routes;
    }

    private static async Task<IResult> CreateJobAsync(
        [FromHeader(Name = "X-Tenant-Id")] string? tenantId,
        [FromBody] CreateExportJobRequest request,
        ConsoleExportJobService service,
        CancellationToken cancellationToken)
    {
        if (string.IsNullOrWhiteSpace(tenantId))
        {
            return Results.Problem(
                title: "Tenant ID required",
                detail: "X-Tenant-Id header is required",
                statusCode: 400,
                extensions: new Dictionary<string, object?> { ["code"] = "TENANT_REQUIRED" });
        }

        try
        {
            var job = await service.CreateJobAsync(tenantId, request, cancellationToken).ConfigureAwait(false);
            return Results.Created($"/api/v1/export/jobs/{job.JobId}", job);
        }
        catch (ArgumentException ex)
        {
            var code = ex.Message.Contains("schedule", StringComparison.OrdinalIgnoreCase)
                ? ExportErrorCodes.InvalidSchedule
                : ExportErrorCodes.InvalidDestination;

            return Results.Problem(
                title: "Validation failed",
                detail: ex.Message,
                statusCode: 400,
                extensions: new Dictionary<string, object?> { ["code"] = code });
        }
    }

    private static async Task<IResult> ListJobsAsync(
        [FromQuery] string? tenant_id,
        ConsoleExportJobService service,
        CancellationToken cancellationToken)
    {
        var response = await service.ListJobsAsync(tenant_id, cancellationToken).ConfigureAwait(false);
        return Results.Ok(response);
    }

    private static async Task<IResult> GetJobAsync(
        [FromRoute] string jobId,
        ConsoleExportJobService service,
        CancellationToken cancellationToken)
    {
        var job = await service.GetJobAsync(jobId, cancellationToken).ConfigureAwait(false);

        if (job is null)
        {
            return Results.Problem(
                title: "Job not found",
                detail: $"Job '{jobId}' not found",
                statusCode: 404,
                extensions: new Dictionary<string, object?> { ["code"] = ExportErrorCodes.JobNotFound });
        }

        return Results.Ok(job);
    }

    private static async Task<IResult> UpdateJobAsync(
        [FromRoute] string jobId,
        [FromBody] UpdateExportJobRequest request,
        ConsoleExportJobService service,
        CancellationToken cancellationToken)
    {
        try
        {
            var job = await service.UpdateJobAsync(jobId, request, cancellationToken).ConfigureAwait(false);
            return Results.Ok(job);
        }
        catch (KeyNotFoundException)
        {
            return Results.Problem(
                title: "Job not found",
                detail: $"Job '{jobId}' not found",
                statusCode: 404,
                extensions: new Dictionary<string, object?> { ["code"] = ExportErrorCodes.JobNotFound });
        }
        catch (ArgumentException ex)
        {
            return Results.Problem(
                title: "Validation failed",
                detail: ex.Message,
                statusCode: 400,
                extensions: new Dictionary<string, object?> { ["code"] = ExportErrorCodes.InvalidSchedule });
        }
    }

    private static async Task<IResult> DeleteJobAsync(
        [FromRoute] string jobId,
        ConsoleExportJobService service,
        CancellationToken cancellationToken)
    {
        await service.DeleteJobAsync(jobId, cancellationToken).ConfigureAwait(false);
        return Results.NoContent();
    }

    private static async Task<IResult> TriggerJobAsync(
        [FromRoute] string jobId,
        ConsoleExportJobService service,
        CancellationToken cancellationToken)
    {
        try
        {
            var response = await service.TriggerJobAsync(jobId, cancellationToken).ConfigureAwait(false);
            return Results.Accepted($"/api/v1/export/jobs/{jobId}/executions/{response.ExecutionId}", response);
        }
        catch (KeyNotFoundException)
        {
            return Results.Problem(
                title: "Job not found",
                detail: $"Job '{jobId}' not found",
                statusCode: 404,
                extensions: new Dictionary<string, object?> { ["code"] = ExportErrorCodes.JobNotFound });
        }
    }

    private static async Task<IResult> GetExecutionAsync(
        [FromRoute] string jobId,
        [FromRoute] string executionId,
        ConsoleExportJobService service,
        CancellationToken cancellationToken)
    {
        var execution = await service.GetExecutionAsync(executionId, cancellationToken).ConfigureAwait(false);

        if (execution is null || !string.Equals(execution.JobId, jobId, StringComparison.Ordinal))
        {
            return Results.NotFound();
        }

        return Results.Ok(execution);
    }

    private static async Task<IResult> GetBundleAsync(
        [FromRoute] string bundleId,
        ConsoleExportJobService service,
        CancellationToken cancellationToken)
    {
        var bundle = await service.GetBundleAsync(bundleId, cancellationToken).ConfigureAwait(false);

        if (bundle is null)
        {
            return Results.NotFound();
        }

        return Results.Ok(bundle);
    }

    private static async Task<IResult> DownloadBundleAsync(
        [FromRoute] string bundleId,
        ConsoleExportJobService service,
        CancellationToken cancellationToken)
    {
        var bundle = await service.GetBundleAsync(bundleId, cancellationToken).ConfigureAwait(false);
        if (bundle is null)
        {
            return Results.NotFound();
        }

        var content = await service.GetBundleContentAsync(bundleId, cancellationToken).ConfigureAwait(false);
        if (content is null)
        {
            return Results.NotFound();
        }

        var contentType = bundle.Format switch
        {
            ExportFormats.Ndjson => "application/x-ndjson",
            _ => "application/json"
        };

        var fileName = $"export-{bundle.BundleId}-{DateTime.UtcNow:yyyy-MM-dd}.json";

        return Results.File(
            content,
            contentType,
            fileName);
    }
}