using Microsoft.AspNetCore.Mvc;
using StellaOps.Auth.ServerIntegration.Tenancy;
using StellaOps.JobEngine.Core.Domain;
using StellaOps.JobEngine.Infrastructure.Repositories;
using StellaOps.JobEngine.WebService.Contracts;
using StellaOps.JobEngine.WebService.Services;
using static StellaOps.Localization.T;

namespace StellaOps.JobEngine.WebService.Endpoints;

/// <summary>
/// REST API endpoints for audit log operations.
/// </summary>
public static class AuditEndpoints
{
    /// <summary>
    /// Maps audit endpoints to the route builder.
    /// </summary>
    public static RouteGroupBuilder MapAuditEndpoints(this IEndpointRouteBuilder app)
    {
        var group = app.MapGroup("/api/v1/jobengine/audit")
            .WithTags("Orchestrator Audit")
            .RequireAuthorization(JobEnginePolicies.Read)
            .RequireTenant();

        // List and get operations
        group.MapGet(string.Empty, ListAuditEntries)
            .WithName("Orchestrator_ListAuditEntries")
            .WithDescription(_t("orchestrator.audit.list_description"));

        group.MapGet("{entryId:guid}", GetAuditEntry)
            .WithName("Orchestrator_GetAuditEntry")
            .WithDescription(_t("orchestrator.audit.get_description"));

        group.MapGet("resource/{resourceType}/{resourceId:guid}", GetResourceHistory)
            .WithName("Orchestrator_GetResourceHistory")
            .WithDescription(_t("orchestrator.audit.get_resource_history_description"));

        group.MapGet("latest", GetLatestEntry)
            .WithName("Orchestrator_GetLatestAuditEntry")
            .WithDescription(_t("orchestrator.audit.get_latest_description"));

        group.MapGet("sequence/{startSeq:long}/{endSeq:long}", GetBySequenceRange)
            .WithName("Orchestrator_GetAuditBySequence")
            .WithDescription(_t("orchestrator.audit.get_by_sequence_description"));

        // Summary and verification
        group.MapGet("summary", GetAuditSummary)
            .WithName("Orchestrator_GetAuditSummary")
            .WithDescription(_t("orchestrator.audit.summary_description"));

        group.MapGet("verify", VerifyAuditChain)
            .WithName("Orchestrator_VerifyAuditChain")
            .WithDescription(_t("orchestrator.audit.verify_description"));

        return group;
    }

    private static async Task<IResult> ListAuditEntries(
        HttpContext context,
        [FromServices] TenantResolver tenantResolver,
        [FromServices] IAuditRepository repository,
        [FromQuery] string? eventType = null,
        [FromQuery] string? resourceType = null,
        [FromQuery] Guid? resourceId = null,
        [FromQuery] string? actorId = null,
        [FromQuery] DateTimeOffset? startTime = null,
        [FromQuery] DateTimeOffset? endTime = null,
        [FromQuery] int? limit = null,
        [FromQuery] string? cursor = null,
        CancellationToken cancellationToken = default)
    {
        try
        {
            var tenantId = tenantResolver.Resolve(context);
            var effectiveLimit = EndpointHelpers.GetLimit(limit);
            var offset = EndpointHelpers.ParseCursorOffset(cursor);

            AuditEventType? parsedEventType = null;
            if (!string.IsNullOrEmpty(eventType) && Enum.TryParse<AuditEventType>(eventType, true, out var et))
            {
                parsedEventType = et;
            }

            var entries = await repository.ListAsync(
                tenantId,
                parsedEventType,
                resourceType,
                resourceId,
                actorId,
                startTime,
                endTime,
                effectiveLimit,
                offset,
                cancellationToken).ConfigureAwait(false);

            var responses = entries.Select(AuditEntryResponse.FromDomain).ToList();
            var nextCursor = EndpointHelpers.CreateNextCursor(offset, effectiveLimit, responses.Count);

            return Results.Ok(new AuditEntryListResponse(responses, nextCursor));
        }
        catch (InvalidOperationException ex)
        {
            return Results.BadRequest(new { error = ex.Message });
        }
    }

    private static async Task<IResult> GetAuditEntry(
        HttpContext context,
        [FromRoute] Guid entryId,
        [FromServices] TenantResolver tenantResolver,
        [FromServices] IAuditRepository repository,
        CancellationToken cancellationToken = default)
    {
        try
        {
            var tenantId = tenantResolver.Resolve(context);
            var entry = await repository.GetByIdAsync(tenantId, entryId, cancellationToken).ConfigureAwait(false);

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

            return Results.Ok(AuditEntryResponse.FromDomain(entry));
        }
        catch (InvalidOperationException ex)
        {
            return Results.BadRequest(new { error = ex.Message });
        }
    }

    private static async Task<IResult> GetResourceHistory(
        HttpContext context,
        [FromRoute] string resourceType,
        [FromRoute] Guid resourceId,
        [FromServices] TenantResolver tenantResolver,
        [FromServices] IAuditRepository repository,
        [FromQuery] int? limit = null,
        CancellationToken cancellationToken = default)
    {
        try
        {
            var tenantId = tenantResolver.Resolve(context);
            var effectiveLimit = EndpointHelpers.GetLimit(limit);

            var entries = await repository.GetByResourceAsync(
                tenantId,
                resourceType,
                resourceId,
                effectiveLimit,
                cancellationToken).ConfigureAwait(false);

            var responses = entries.Select(AuditEntryResponse.FromDomain).ToList();
            return Results.Ok(new AuditEntryListResponse(responses, null));
        }
        catch (InvalidOperationException ex)
        {
            return Results.BadRequest(new { error = ex.Message });
        }
    }

    private static async Task<IResult> GetLatestEntry(
        HttpContext context,
        [FromServices] TenantResolver tenantResolver,
        [FromServices] IAuditRepository repository,
        CancellationToken cancellationToken = default)
    {
        try
        {
            var tenantId = tenantResolver.Resolve(context);
            var entry = await repository.GetLatestAsync(tenantId, cancellationToken).ConfigureAwait(false);

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

            return Results.Ok(AuditEntryResponse.FromDomain(entry));
        }
        catch (InvalidOperationException ex)
        {
            return Results.BadRequest(new { error = ex.Message });
        }
    }

    private static async Task<IResult> GetBySequenceRange(
        HttpContext context,
        [FromRoute] long startSeq,
        [FromRoute] long endSeq,
        [FromServices] TenantResolver tenantResolver,
        [FromServices] IAuditRepository repository,
        CancellationToken cancellationToken = default)
    {
        try
        {
            var tenantId = tenantResolver.Resolve(context);

            if (startSeq < 1 || endSeq < startSeq)
            {
                return Results.BadRequest(new { error = _t("orchestrator.audit.error.invalid_sequence_range") });
            }

            var entries = await repository.GetBySequenceRangeAsync(
                tenantId,
                startSeq,
                endSeq,
                cancellationToken).ConfigureAwait(false);

            var responses = entries.Select(AuditEntryResponse.FromDomain).ToList();
            return Results.Ok(new AuditEntryListResponse(responses, null));
        }
        catch (InvalidOperationException ex)
        {
            return Results.BadRequest(new { error = ex.Message });
        }
    }

    private static async Task<IResult> GetAuditSummary(
        HttpContext context,
        [FromServices] TenantResolver tenantResolver,
        [FromServices] IAuditRepository repository,
        [FromQuery] DateTimeOffset? since = null,
        CancellationToken cancellationToken = default)
    {
        try
        {
            var tenantId = tenantResolver.Resolve(context);
            var summary = await repository.GetSummaryAsync(tenantId, since, cancellationToken).ConfigureAwait(false);

            return Results.Ok(AuditSummaryResponse.FromDomain(summary));
        }
        catch (InvalidOperationException ex)
        {
            return Results.BadRequest(new { error = ex.Message });
        }
    }

    private static async Task<IResult> VerifyAuditChain(
        HttpContext context,
        [FromServices] TenantResolver tenantResolver,
        [FromServices] IAuditRepository repository,
        [FromQuery] long? startSeq = null,
        [FromQuery] long? endSeq = null,
        CancellationToken cancellationToken = default)
    {
        try
        {
            var tenantId = tenantResolver.Resolve(context);
            var result = await repository.VerifyChainAsync(tenantId, startSeq, endSeq, cancellationToken).ConfigureAwait(false);

            Infrastructure.JobEngineMetrics.AuditChainVerified(tenantId, result.IsValid);

            return Results.Ok(ChainVerificationResponse.FromDomain(result));
        }
        catch (InvalidOperationException ex)
        {
            return Results.BadRequest(new { error = ex.Message });
        }
    }
}