using System.ComponentModel.DataAnnotations;
using Microsoft.AspNetCore.Mvc;
using StellaOps.Auth.Abstractions;
using StellaOps.Scheduler.WebService.Auth;

namespace StellaOps.Scheduler.WebService.VulnerabilityResolverJobs;

public static class ResolverJobEndpointExtensions
{
    private const string ScopeWrite = StellaOpsScopes.EffectiveWrite;
    private const string ScopeRead = StellaOpsScopes.FindingsRead;

    public static void MapResolverJobEndpoints(this IEndpointRouteBuilder builder)
    {
        var group = builder.MapGroup("/api/v1/scheduler/vuln/resolver");
        group.MapPost("/jobs", CreateJobAsync);
        group.MapGet("/jobs/{jobId}", GetJobAsync);
        group.MapGet("/metrics", GetLagMetricsAsync);
    }

    internal static async Task<IResult> CreateJobAsync(
        [FromBody] ResolverJobRequest request,
        HttpContext httpContext,
        [FromServices] ITenantContextAccessor tenantAccessor,
        [FromServices] IScopeAuthorizer authorizer,
        [FromServices] IResolverJobService jobService,
        CancellationToken cancellationToken)
    {
        try
        {
            authorizer.EnsureScope(httpContext, ScopeWrite);
            var tenant = tenantAccessor.GetTenant(httpContext);
            var job = await jobService.CreateAsync(tenant.TenantId, request, cancellationToken).ConfigureAwait(false);
            return Results.Created($"/api/v1/scheduler/vuln/resolver/jobs/{job.Id}", job);
        }
        catch (UnauthorizedAccessException ex)
        {
            return Results.Json(new { error = ex.Message }, statusCode: StatusCodes.Status401Unauthorized);
        }
        catch (InvalidOperationException ex)
        {
            return Results.Json(new { error = ex.Message }, statusCode: StatusCodes.Status403Forbidden);
        }
        catch (ValidationException ex)
        {
            return Results.Json(new { error = ex.Message }, statusCode: StatusCodes.Status400BadRequest);
        }
    }

    internal static async Task<IResult> GetJobAsync(
        string jobId,
        HttpContext httpContext,
        [FromServices] ITenantContextAccessor tenantAccessor,
        [FromServices] IScopeAuthorizer authorizer,
        [FromServices] IResolverJobService jobService,
        CancellationToken cancellationToken)
    {
        try
        {
            authorizer.EnsureScope(httpContext, ScopeRead);
            var tenant = tenantAccessor.GetTenant(httpContext);
            var job = await jobService.GetAsync(tenant.TenantId, jobId, cancellationToken).ConfigureAwait(false);
            return job is null ? Results.NotFound() : Results.Ok(job);
        }
        catch (UnauthorizedAccessException ex)
        {
            return Results.Json(new { error = ex.Message }, statusCode: StatusCodes.Status401Unauthorized);
        }
        catch (InvalidOperationException ex)
        {
            return Results.Json(new { error = ex.Message }, statusCode: StatusCodes.Status403Forbidden);
        }
    }

    internal static IResult GetLagMetricsAsync(
        HttpContext httpContext,
        [FromServices] ITenantContextAccessor tenantAccessor,
        [FromServices] IScopeAuthorizer authorizer,
        [FromServices] IResolverJobService jobService,
        [FromServices] IResolverBacklogService backlogService,
        [FromServices] IResolverBacklogNotifier backlogNotifier)
    {
        try
        {
            authorizer.EnsureScope(httpContext, ScopeRead);
            var tenant = tenantAccessor.GetTenant(httpContext);
            var metrics = jobService.ComputeMetrics(tenant.TenantId);
            var backlog = backlogService.GetSummary();
            backlogNotifier.NotifyIfBreached(metrics with { Pending = (int)backlog.TotalDepth });
            return Results.Ok(new { jobs = metrics, backlog });
        }
        catch (UnauthorizedAccessException ex)
        {
            return Results.Json(new { error = ex.Message }, statusCode: StatusCodes.Status401Unauthorized);
        }
        catch (InvalidOperationException ex)
        {
            return Results.Json(new { error = ex.Message }, statusCode: StatusCodes.Status403Forbidden);
        }
    }
}