using FastEndpoints;
using KArtSell.Host.Features.Audit;

namespace KArtSell.Host.Endpoints.Audit;

/// <summary>
/// GET /api/admin/audit-logs - Retrieve authentication audit logs
/// Requires Admin or SecurityOfficer role
/// </summary>
public sealed class GetAuditLogsEndpoint : Endpoint<GetAuditLogsRequest, GetAuditLogsResponse>
{
    private readonly IAuthAuditSql _auditSql;

    public GetAuditLogsEndpoint(IAuthAuditSql auditSql)
    {
        _auditSql = auditSql;
    }

    public override void Configure()
    {
        Get("/audit-logs");
        Roles("Admin", "SecurityOfficer");
        Description(x => x
            .WithName("Get Audit Logs")
            .WithDescription("Retrieve authentication audit logs for compliance reporting")
            .Accepts<GetAuditLogsRequest>("application/json")
            .Produces<GetAuditLogsResponse>(200, "application/json"));
    }

    public override async Task HandleAsync(GetAuditLogsRequest req, CancellationToken ct)
    {
        var logs = await _auditSql.GetAuditLogsAsync(
            startDate: req.StartDate,
            endDate: req.EndDate,
            eventType: req.EventType,
            username: req.Username,
            limit: req.PageSize > 1000 ? 1000 : req.PageSize,  // Cap at 1000
            offset: (req.Page - 1) * req.PageSize,
            ct: ct
        );

        var total = await _auditSql.GetAuditLogsCountAsync(
            startDate: req.StartDate,
            endDate: req.EndDate,
            eventType: req.EventType,
            username: req.Username,
            ct: ct
        );

        var items = logs.Select(entry => new AuditLogItem
        {
            AuditId = entry.AuditId,
            EventType = entry.EventType,
            IdentityId = entry.IdentityId,
            Username = entry.Username,
            Role = entry.Role,
            IpAddress = entry.IpAddress,
            Endpoint = entry.Endpoint,
            HttpMethod = entry.HttpMethod,
            Status = entry.Status,
            ErrorCode = entry.ErrorCode,
            ErrorMessage = entry.ErrorMessage,
            OccurredAt = entry.OccurredAt
        }).ToList();

        await Send.OkAsync(new GetAuditLogsResponse
        {
            Items = items,
            Total = total,
            Page = req.Page,
            PageSize = req.PageSize
        }, ct);
    }
}

public class GetAuditLogsRequest
{
    public DateTime? StartDate { get; set; }
    public DateTime? EndDate { get; set; }
    public string? EventType { get; set; }  // LOGIN, LOGOUT, MFA_SETUP, etc.
    public string? Username { get; set; }
    public int Page { get; set; } = 1;
    public int PageSize { get; set; } = 50;
}

public class GetAuditLogsResponse
{
    public required List<AuditLogItem> Items { get; set; }
    public int Total { get; set; }
    public int Page { get; set; }
    public int PageSize { get; set; }
}

public class AuditLogItem
{
    public Guid AuditId { get; set; }
    public required string EventType { get; set; }
    public Guid? IdentityId { get; set; }
    public string? Username { get; set; }
    public string? Role { get; set; }
    public string? IpAddress { get; set; }
    public string? Endpoint { get; set; }
    public string? HttpMethod { get; set; }
    public required string Status { get; set; }
    public string? ErrorCode { get; set; }
    public string? ErrorMessage { get; set; }
    public DateTime OccurredAt { get; set; }
}