using Microsoft.AspNetCore.Mvc;
using Nexus.Api.Data;
using Nexus.Api.DTOs;
using Nexus.Api.Repositories;

namespace Nexus.Api.Controllers;

[ApiController]
[Route("api/v1/projects")]
public class ProjectsController(IProjectRepository projectRepo, IActivityRepository activityRepo) : ControllerBase
{
    [HttpGet]
    public async Task<IResult> GetAll(CancellationToken ct)
        => Results.Ok(await projectRepo.GetAllAsync(ct));

    [HttpPost]
    public async Task<IResult> Create([FromBody] CreateProjectRequest request, CancellationToken ct)
    {
        if (string.IsNullOrWhiteSpace(request.Name))
            return Results.ValidationProblem(new Dictionary<string, string[]> { ["name"] = ["Name is required."] });

        var project = new Project
        {
            Name = request.Name.Trim(),
            Description = request.Description?.Trim() ?? string.Empty,
            Status = OperationalStatus.Online
        };
        await projectRepo.AddAsync(project, ct);
        await activityRepo.AddAsync(new ActivityEvent { Type = "project", Message = $"Project {project.Name} created" }, ct);
        return Results.Created($"/api/v1/projects/{project.Id}", project);
    }

    [HttpGet("{id:guid}")]
    public async Task<IResult> GetById(Guid id, CancellationToken ct)
    {
        var project = await projectRepo.GetByIdAsync(id, ct);
        return project is null ? Results.NotFound() : Results.Ok(project);
    }

    [HttpPatch("{id:guid}")]
    public async Task<IResult> Update(Guid id, [FromBody] UpdateProjectRequest request, CancellationToken ct)
    {
        var project = await projectRepo.GetByIdAsync(id, ct);
        if (project is null) return Results.NotFound();

        if (!string.IsNullOrWhiteSpace(request.Name))
            project.Name = request.Name.Trim();
        if (request.Description is not null)
            project.Description = request.Description.Trim();
        if (!string.IsNullOrWhiteSpace(request.Status) && Enum.TryParse<OperationalStatus>(request.Status, true, out var parsedStatus))
            project.Status = parsedStatus;

        await projectRepo.UpdateAsync(project, ct);
        await activityRepo.AddAsync(new ActivityEvent { Type = "project", Message = $"Project {project.Name} updated" }, ct);
        return Results.Ok(project);
    }

    [HttpDelete("{id:guid}")]
    public async Task<IResult> Delete(Guid id, CancellationToken ct)
    {
        var project = await projectRepo.GetByIdAsync(id, ct);
        if (project is null) return Results.NotFound();

        var hasTasks = await projectRepo.HasTasksAsync(id, ct);
        if (hasTasks)
        {
            project.Status = OperationalStatus.Offline;
            await projectRepo.UpdateAsync(project, ct);
            await activityRepo.AddAsync(new ActivityEvent { Type = "project", Message = $"Project {project.Name} archived" }, ct);
            return Results.Ok(project);
        }

        await projectRepo.DeleteAsync(project, ct);
        await activityRepo.AddAsync(new ActivityEvent { Type = "project", Message = $"Project {project.Name} deleted" }, ct);
        return Results.NoContent();
    }
}