using PostFundManagement.Domain;
using PostFundManagement.Domain.Abstractions;
using PostFundManagement.Domain.Api;
using PostFundManagement.Domain.Extensions;
using PostFundManagement.Infrastructure.Database;

namespace PostFundManagement.Api.Endpoints.Governance;

[ApiVersionTarget(1)]
public class DashboardEndpoint : IEndpoint
{
    public void Map(IEndpointRouteBuilder builder)
    {
        builder.MapGet("api/governance/dashboard", async (IDbContextFactory<ApplicationDbContext> contextFactory, 
            CancellationToken cancellationToken = default) =>
        {
            using var context = await contextFactory.CreateDbContextAsync(cancellationToken);

            var totalPortfolioValue = await context.Awards.SumAsync(a => a.Amount, cancellationToken);
            var activeAwardsCount = await context.Awards.CountAsync(a => a.Status == ApprovalStatus.Approved, cancellationToken);

            var disbursedAmount = await context.Disbursements.Where(d => d.Status == ApprovalStatus.Approved)
                .SumAsync(d => d.Amount, cancellationToken);

            var totalProjects = await context.Projects.CountAsync(cancellationToken);
            var onTrackProjects = await context.Projects.CountAsync(p => p.Status == ApprovalStatus.Approved, cancellationToken);

            var onTrackPercentage = totalProjects > 0
                ? Math.Round((double)onTrackProjects / totalProjects * 100, 1) 
                : 100.0;

            var atRiskCount = await context.Risks.CountAsync(r => r.Impact == RiskImpact.Critical || r.Impact == RiskImpact.Major, cancellationToken);

            var beneficiariesReached = await context.Beneficiaries.SumAsync(b => b.ReachedCount, cancellationToken);

            return Results.Ok(new
            {
                PortfolioValue = totalPortfolioValue,
                ActiveAwards = activeAwardsCount,
                Disbursed = disbursedAmount,
                OnTrackPercentage = onTrackPercentage,
                AtRiskCount = atRiskCount,
                BeneficiariesReached = beneficiariesReached
            });
        })
        .RequireAuthorization()
        .WithDescription("Get executive portfolio dashboard metrics and KPIs")
        .WithName(typeof(DashboardEndpoint).ToEndpointName())
        .MapToApiVersion(new ApiVersion(1))
        .Produces(StatusCodes.Status200OK)
        .Produces(StatusCodes.Status401Unauthorized)
        .WithTags(EndpointTags.Governance);
    }
}