using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Routing;
using StellaOps.Platform.WebService.Constants;
using StellaOps.Platform.WebService.Contracts;
using StellaOps.Platform.WebService.Services;

namespace StellaOps.Platform.WebService.Endpoints;

/// <summary>
/// Release Control bundle lifecycle endpoints consumed by UI v2 shell.
/// </summary>
public static class ReleaseControlEndpoints
{
    private const int DefaultLimit = 50;
    private const int MaxLimit = 200;

    public static IEndpointRouteBuilder MapReleaseControlEndpoints(this IEndpointRouteBuilder app)
    {
        var bundles = app.MapGroup("/api/v1/release-control/bundles")
            .WithTags("Release Control");

        bundles.MapGet(string.Empty, async Task<IResult>(
            HttpContext context,
            PlatformRequestContextResolver resolver,
            IReleaseControlBundleStore store,
            TimeProvider timeProvider,
            [FromQuery] int? limit,
            [FromQuery] int? offset,
            CancellationToken cancellationToken) =>
        {
            if (!TryResolveContext(context, resolver, out var requestContext, out var failure))
            {
                return failure!;
            }

            var normalizedLimit = NormalizeLimit(limit);
            var normalizedOffset = NormalizeOffset(offset);

            var items = await store.ListBundlesAsync(
                requestContext!.TenantId,
                normalizedLimit,
                normalizedOffset,
                cancellationToken).ConfigureAwait(false);

            return Results.Ok(new PlatformListResponse<ReleaseControlBundleSummary>(
                requestContext.TenantId,
                requestContext.ActorId,
                timeProvider.GetUtcNow(),
                Cached: false,
                CacheTtlSeconds: 0,
                items,
                items.Count,
                normalizedLimit,
                normalizedOffset));
        })
        .WithName("ListReleaseControlBundles")
        .WithSummary("List release control bundles")
        .RequireAuthorization(PlatformPolicies.ReleaseControlRead);

        bundles.MapGet("/{bundleId:guid}", async Task<IResult>(
            HttpContext context,
            PlatformRequestContextResolver resolver,
            IReleaseControlBundleStore store,
            TimeProvider timeProvider,
            Guid bundleId,
            CancellationToken cancellationToken) =>
        {
            if (!TryResolveContext(context, resolver, out var requestContext, out var failure))
            {
                return failure!;
            }

            var item = await store.GetBundleAsync(
                requestContext!.TenantId,
                bundleId,
                cancellationToken).ConfigureAwait(false);

            if (item is null)
            {
                return Results.NotFound(new { error = "bundle_not_found", bundleId });
            }

            return Results.Ok(new PlatformItemResponse<ReleaseControlBundleDetail>(
                requestContext.TenantId,
                requestContext.ActorId,
                timeProvider.GetUtcNow(),
                Cached: false,
                CacheTtlSeconds: 0,
                item));
        })
        .WithName("GetReleaseControlBundle")
        .WithSummary("Get release control bundle by id")
        .RequireAuthorization(PlatformPolicies.ReleaseControlRead);

        bundles.MapPost(string.Empty, async Task<IResult>(
            HttpContext context,
            PlatformRequestContextResolver resolver,
            IReleaseControlBundleStore store,
            CreateReleaseControlBundleRequest request,
            CancellationToken cancellationToken) =>
        {
            if (!TryResolveContext(context, resolver, out var requestContext, out var failure))
            {
                return failure!;
            }

            try
            {
                var created = await store.CreateBundleAsync(
                    requestContext!.TenantId,
                    requestContext.ActorId,
                    request,
                    cancellationToken).ConfigureAwait(false);

                var location = $"/api/v1/release-control/bundles/{created.Id}";
                return Results.Created(location, created);
            }
            catch (InvalidOperationException ex)
            {
                return MapStoreError(ex, bundleId: null, versionId: null);
            }
        })
        .WithName("CreateReleaseControlBundle")
        .WithSummary("Create release control bundle")
        .RequireAuthorization(PlatformPolicies.ReleaseControlOperate);

        bundles.MapGet("/{bundleId:guid}/versions", async Task<IResult>(
            HttpContext context,
            PlatformRequestContextResolver resolver,
            IReleaseControlBundleStore store,
            TimeProvider timeProvider,
            Guid bundleId,
            [FromQuery] int? limit,
            [FromQuery] int? offset,
            CancellationToken cancellationToken) =>
        {
            if (!TryResolveContext(context, resolver, out var requestContext, out var failure))
            {
                return failure!;
            }

            var normalizedLimit = NormalizeLimit(limit);
            var normalizedOffset = NormalizeOffset(offset);

            try
            {
                var items = await store.ListVersionsAsync(
                    requestContext!.TenantId,
                    bundleId,
                    normalizedLimit,
                    normalizedOffset,
                    cancellationToken).ConfigureAwait(false);

                return Results.Ok(new PlatformListResponse<ReleaseControlBundleVersionSummary>(
                    requestContext.TenantId,
                    requestContext.ActorId,
                    timeProvider.GetUtcNow(),
                    Cached: false,
                    CacheTtlSeconds: 0,
                    items,
                    items.Count,
                    normalizedLimit,
                    normalizedOffset));
            }
            catch (InvalidOperationException ex)
            {
                return MapStoreError(ex, bundleId, versionId: null);
            }
        })
        .WithName("ListReleaseControlBundleVersions")
        .WithSummary("List bundle versions")
        .RequireAuthorization(PlatformPolicies.ReleaseControlRead);

        bundles.MapGet("/{bundleId:guid}/versions/{versionId:guid}", async Task<IResult>(
            HttpContext context,
            PlatformRequestContextResolver resolver,
            IReleaseControlBundleStore store,
            TimeProvider timeProvider,
            Guid bundleId,
            Guid versionId,
            CancellationToken cancellationToken) =>
        {
            if (!TryResolveContext(context, resolver, out var requestContext, out var failure))
            {
                return failure!;
            }

            var version = await store.GetVersionAsync(
                requestContext!.TenantId,
                bundleId,
                versionId,
                cancellationToken).ConfigureAwait(false);

            if (version is null)
            {
                return Results.NotFound(new { error = "bundle_version_not_found", bundleId, versionId });
            }

            return Results.Ok(new PlatformItemResponse<ReleaseControlBundleVersionDetail>(
                requestContext.TenantId,
                requestContext.ActorId,
                timeProvider.GetUtcNow(),
                Cached: false,
                CacheTtlSeconds: 0,
                version));
        })
        .WithName("GetReleaseControlBundleVersion")
        .WithSummary("Get bundle version")
        .RequireAuthorization(PlatformPolicies.ReleaseControlRead);

        bundles.MapPost("/{bundleId:guid}/versions", async Task<IResult>(
            HttpContext context,
            PlatformRequestContextResolver resolver,
            IReleaseControlBundleStore store,
            Guid bundleId,
            PublishReleaseControlBundleVersionRequest request,
            CancellationToken cancellationToken) =>
        {
            if (!TryResolveContext(context, resolver, out var requestContext, out var failure))
            {
                return failure!;
            }

            try
            {
                var created = await store.PublishVersionAsync(
                    requestContext!.TenantId,
                    requestContext.ActorId,
                    bundleId,
                    request,
                    cancellationToken).ConfigureAwait(false);

                var location = $"/api/v1/release-control/bundles/{bundleId}/versions/{created.Id}";
                return Results.Created(location, created);
            }
            catch (InvalidOperationException ex)
            {
                return MapStoreError(ex, bundleId, versionId: null);
            }
        })
        .WithName("PublishReleaseControlBundleVersion")
        .WithSummary("Publish immutable bundle version")
        .RequireAuthorization(PlatformPolicies.ReleaseControlOperate);

        bundles.MapPost("/{bundleId:guid}/versions/{versionId:guid}/materialize", async Task<IResult>(
            HttpContext context,
            PlatformRequestContextResolver resolver,
            IReleaseControlBundleStore store,
            Guid bundleId,
            Guid versionId,
            MaterializeReleaseControlBundleVersionRequest request,
            CancellationToken cancellationToken) =>
        {
            if (!TryResolveContext(context, resolver, out var requestContext, out var failure))
            {
                return failure!;
            }

            try
            {
                var run = await store.MaterializeVersionAsync(
                    requestContext!.TenantId,
                    requestContext.ActorId,
                    bundleId,
                    versionId,
                    request,
                    cancellationToken).ConfigureAwait(false);

                var location = $"/api/v1/release-control/bundles/{bundleId}/versions/{versionId}/materialize/{run.RunId}";
                return Results.Accepted(location, run);
            }
            catch (InvalidOperationException ex)
            {
                return MapStoreError(ex, bundleId, versionId);
            }
        })
        .WithName("MaterializeReleaseControlBundleVersion")
        .WithSummary("Materialize bundle version")
        .RequireAuthorization(PlatformPolicies.ReleaseControlOperate);

        return app;
    }

    private static int NormalizeLimit(int? value)
    {
        return value switch
        {
            null => DefaultLimit,
            < 1 => 1,
            > MaxLimit => MaxLimit,
            _ => value.Value
        };
    }

    private static int NormalizeOffset(int? value) => value is null or < 0 ? 0 : value.Value;

    private static IResult MapStoreError(InvalidOperationException exception, Guid? bundleId, Guid? versionId)
    {
        return exception.Message switch
        {
            "bundle_not_found" => Results.NotFound(new { error = "bundle_not_found", bundleId }),
            "bundle_version_not_found" => Results.NotFound(new { error = "bundle_version_not_found", bundleId, versionId }),
            "bundle_slug_exists" => Results.Conflict(new { error = "bundle_slug_exists" }),
            "bundle_slug_required" => Results.BadRequest(new { error = "bundle_slug_required" }),
            "bundle_name_required" => Results.BadRequest(new { error = "bundle_name_required" }),
            "request_required" => Results.BadRequest(new { error = "request_required" }),
            "tenant_required" => Results.BadRequest(new { error = "tenant_required" }),
            "tenant_id_invalid" => Results.BadRequest(new { error = "tenant_id_invalid" }),
            _ => Results.BadRequest(new { error = exception.Message })
        };
    }

    private static bool TryResolveContext(
        HttpContext context,
        PlatformRequestContextResolver resolver,
        out PlatformRequestContext? requestContext,
        out IResult? failure)
    {
        if (resolver.TryResolve(context, out requestContext, out var error))
        {
            failure = null;
            return true;
        }

        failure = Results.BadRequest(new { error = error ?? "tenant_missing" });
        return false;
    }
}