using Asp.Versioning;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using TarninaHub.Application.Abstractions;
using TarninaHub.Application.Dtos;
using TarninaHub.Application.Mappings;
using TarninaHub.Application.Security;
using TarninaHub.Domain.Rules;

namespace TarninaHub.Controllers;

[ApiController]
[ApiVersion("1.0")]
[Route("api/ideas")]
[Authorize]
public class IdeasController : ControllerBase
{
    private readonly IIdeaService _ideaService;
    private readonly IIdeaAssistant _ideaAssistant;

    public IdeasController(IIdeaService ideaService, IIdeaAssistant ideaAssistant)
    {
        _ideaService = ideaService;
        _ideaAssistant = ideaAssistant;
    }

    [HttpPost]
    public async Task<ActionResult<IdeaResponse>> Create(
        CreateIdeaRequest request,
        CancellationToken cancellationToken)
    {
        var userId = User.GetUserId();

        if (string.IsNullOrWhiteSpace(userId))
        {
            return Unauthorized();
        }

        var created = await _ideaService.CreateAsync(userId, request, cancellationToken);

        return CreatedAtAction(nameof(GetById), new { ideaId = created.Id }, created);
    }

    [HttpGet]
    public async Task<ActionResult<IReadOnlyList<IdeaResponse>>> ListMine(CancellationToken cancellationToken)
    {
        var userId = User.GetUserId();

        if (string.IsNullOrWhiteSpace(userId))
        {
            return Unauthorized();
        }

        var ideas = await _ideaService.ListForAuthorAsync(userId, cancellationToken);

        return Ok(ideas);
    }

    [HttpGet("{ideaId}")]
    public async Task<ActionResult<IdeaResponse>> GetById(string ideaId, CancellationToken cancellationToken)
    {
        var idea = await _ideaService.GetAsync(ideaId, cancellationToken);

        if (idea is null)
        {
            return NotFound();
        }

        if (!IsOwner(idea) && !IsStaff())
        {
            return Forbid();
        }

        return Ok(idea);
    }

    [HttpPut("{ideaId}")]
    public async Task<ActionResult<IdeaResponse>> Update(
        string ideaId,
        UpdateIdeaRequest request,
        CancellationToken cancellationToken)
    {
        var current = await _ideaService.GetAsync(ideaId, cancellationToken);

        if (current is null)
        {
            return NotFound();
        }

        if (!IsOwner(current))
        {
            return Forbid();
        }

        if (!string.IsNullOrWhiteSpace(request.Status))
        {
            var from = IdeaStatusWire.Parse(current.Status);
            var to = IdeaStatusWire.Parse(request.Status);

            if (to is null || from is null || !IdeaWorkflow.CanTransition(from.Value, to.Value))
            {
                ModelState.AddModelError(
                    nameof(request.Status),
                    $"Transition from '{current.Status}' to '{request.Status}' is not allowed.");

                return ValidationProblem(ModelState);
            }
        }

        var updated = await _ideaService.UpdateAsync(ideaId, request, cancellationToken);

        return updated is null ? NotFound() : Ok(updated);
    }

    [HttpGet("{ideaId}/card")]
    public async Task<ActionResult<IdeaCardResponse>> GetCard(string ideaId, CancellationToken cancellationToken)
    {
        var idea = await _ideaService.GetAsync(ideaId, cancellationToken);

        if (idea is null)
        {
            return NotFound();
        }

        if (!IsOwner(idea) && !IsStaff())
        {
            return Forbid();
        }

        var card = await _ideaService.GetCardAsync(ideaId, cancellationToken);

        return card is null ? NotFound() : Ok(card);
    }

    [HttpPut("{ideaId}/card")]
    public async Task<ActionResult<IdeaCardResponse>> UpdateCard(
        string ideaId,
        IdeaCardRequest request,
        CancellationToken cancellationToken)
    {
        var idea = await _ideaService.GetAsync(ideaId, cancellationToken);

        if (idea is null)
        {
            return NotFound();
        }

        if (!IsOwner(idea))
        {
            return Forbid();
        }

        var card = await _ideaService.UpdateCardAsync(ideaId, request, cancellationToken);

        return card is null ? NotFound() : Ok(card);
    }

    [HttpPost("{ideaId}/assist")]
    public async Task<ActionResult<IdeaAssistResponse>> Assist(
        string ideaId,
        IdeaAssistRequest request,
        CancellationToken cancellationToken)
    {
        var idea = await _ideaService.GetAsync(ideaId, cancellationToken);

        if (idea is null)
        {
            return NotFound();
        }

        if (!IsOwner(idea) && !IsStaff())
        {
            return Forbid();
        }

        var assist = await _ideaAssistant.AssistAsync(ideaId, request, cancellationToken);

        return assist is null ? NotFound() : Ok(assist);
    }

    private bool IsOwner(IdeaResponse idea) =>
        string.Equals(idea.AuthorId, User.GetUserId(), StringComparison.Ordinal);

    private bool IsStaff() =>
        User.IsInRole(RoleNames.Operator) || User.IsInRole(RoleNames.Manager) || User.IsInRole(RoleNames.Admin);
}