using Microsoft.EntityFrameworkCore;
using Nexus.Api.Data;
using System.Text.Json;

namespace Nexus.Api.Repositories;

public sealed class ProjectRepository(NexusDbContext db) : IProjectRepository
{
    public Task<List<Project>> GetAllAsync(CancellationToken ct = default)
        => db.Projects.AsNoTracking().OrderByDescending(x => x.UpdatedAt).ToListAsync(ct);

    public ValueTask<Project?> GetByIdAsync(Guid id, CancellationToken ct = default)
        => db.Projects.FindAsync([id], ct);

    public async Task<Project> AddAsync(Project project, CancellationToken ct = default)
    {
        db.Projects.Add(project);
        db.OutboxEvents.Add(CreateProjectEvent("project.created", project));
        await db.SaveChangesAsync(ct);
        return project;
    }

    public async Task UpdateAsync(Project project, CancellationToken ct = default)
    {
        project.UpdatedAt = DateTimeOffset.UtcNow;
        db.OutboxEvents.Add(CreateProjectEvent("project.updated", project));
        await db.SaveChangesAsync(ct);
    }

    public async Task DeleteAsync(Project project, CancellationToken ct = default)
    {
        db.OutboxEvents.Add(CreateProjectEvent("project.deleted", project));
        db.Projects.Remove(project);
        await db.SaveChangesAsync(ct);
    }

    public Task<bool> HasTasksAsync(Guid projectId, CancellationToken ct = default)
        => db.Tasks.AnyAsync(t => t.ProjectId == projectId, ct);

    public Task<List<WorkTask>> GetTasksAsync(
        Guid projectId,
        CancellationToken ct = default)
        => db.Tasks
            .AsNoTracking()
            .Where(task => task.ProjectId == projectId)
            .OrderBy(task => task.State == "Done" ? 1 : 0)
            .ThenByDescending(task => task.UpdatedAt)
            .ThenBy(task => task.Id)
            .ToListAsync(ct);

    private static OutboxEvent CreateProjectEvent(string type, Project project)
        => new()
        {
            Type = type,
            AggregateType = "project",
            AggregateId = project.Id.ToString(),
            AggregateRevision = 0,
            PayloadJson = JsonSerializer.Serialize(new
            {
                status = project.Status,
                progress = project.Progress
            })
        };
}