using PostFundManagement.Domain;
using PostFundManagement.Domain.Abstractions;
using PostFundManagement.Domain.Errors;
using PostFundManagement.Domain.Extensions;
using PostFundManagement.Domain.Models;
using PostFundManagement.Infrastructure.Database;

namespace PostFundManagement.Application.Services.Shared;

public sealed class AuditService(IDbContextFactory<ApplicationDbContext> contextFactory, ITenantContextService tenantContextService) : IService
{
    public async Task<Result<AuditLog[]>> GetAuditLogsAsync(CancellationToken cancellationToken = default) =>
        await Result.Try((Func<Task<Result<AuditLog[]>>>)(async () =>
        {
            await using var context = await contextFactory.CreateDbContextAsync(cancellationToken);

            var pagination = new Pagination { Page = 1, PageSize = 500, Index = 1 };

            var logs = await context.AuditLogs
                .OrderByDescending(o => o.Id)
                .Skip((pagination.Page - 1) * pagination.PageSize)
                .Take(pagination.PageSize)
                .ToListAsync(cancellationToken);

            return Result.Ok(logs.Select(p => p.Map()).ToArray());
        }));

    public async Task<Result<AuditLog[]>> GetAuditLogsAsync(Pagination pagination, CancellationToken cancellationToken = default) =>
        await Result.Try((Func<Task<Result<AuditLog[]>>>)(async () =>
        {
            await using var context = await contextFactory.CreateDbContextAsync(cancellationToken);

            var logs = await context.AuditLogs
                .OrderByDescending(o => o.Id)
                .Skip((pagination.Page - 1) * pagination.PageSize)
                .Take(pagination.PageSize)
                .ToListAsync(cancellationToken);

            return Result.Ok(logs.Select(p => p.Map()).ToArray());
        }));

    public async Task<Result> LogActionAsync(string entityId, string entityName, string action, string[] changes, Guid performedBy, CancellationToken cancellationToken = default) =>
        await Result.Try((Func<Task<Result>>)(async () =>
        {
            await using var context = await contextFactory.CreateDbContextAsync(cancellationToken);

            context.Add(new Domain.Entities.AuditLog
            {
                EntityId = entityId,
                Action = action,
                Changes = changes,
                EntityName = entityName,
                PerformedBy = performedBy,
                Timestamp = DateTime.UtcNow,
                TenantId = tenantContextService.TenantId > 0 ? tenantContextService.TenantId : null,
            });

            return Result.FailIf(await context.SaveChangesAsync(cancellationToken) <= 0, CreateError.New);
        }));
}