using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using ProposalSystem.Application.DTOs;
using ProposalSystem.Application.Interfaces;
using ProposalSystem.Domain.Entities;
using ProposalSystem.Infrastructure.Data;

namespace ProposalSystem.Api.Controllers;

[ApiController]
[Route("api/generated-pdfs")]
[Authorize]
public class GeneratedPdfsController : ControllerBase
{
    private readonly ProposalDbContext _db;
    private readonly ICurrentUserService _currentUser;

    public GeneratedPdfsController(ProposalDbContext db, ICurrentUserService currentUser)
    {
        _db = db;
        _currentUser = currentUser;
    }

    [HttpPost]
    [Authorize(Roles = "admins,sysadmins")]
    public async Task<IActionResult> Create([FromBody] CreateGeneratedPdfRequest request, CancellationToken ct)
    {
        var proposal = await _db.Proposals.FindAsync(new object[] { request.ProposalId }, ct);
        if (proposal == null) return NotFound();

        // Fix: API-M4 — verify dispatcher ownership before allowing PDF creation
        if (!AuthorizeProposalAccess(proposal))
            return Forbid();

        await _currentUser.ResolveAsync();

        var pdf = new GeneratedPdf
        {
            Id = Guid.NewGuid(),
            ProposalId = request.ProposalId,
            Revision = proposal.CurrentRevision,
            S3Key = request.S3Key,
            GeneratedAt = DateTime.UtcNow,
            GeneratedById = _currentUser.UserId,
        };

        _db.GeneratedPdfs.Add(pdf);
        await _db.SaveChangesAsync(ct);

        return Created($"/api/generated-pdfs/{pdf.Id}", new { pdf.Id, pdf.S3Key, pdf.Revision });
    }

    // Fix: API-M4 — dispatchers can only access PDFs for proposals they submitted
    private bool AuthorizeProposalAccess(Proposal proposal)
    {
        if (_currentUser.Role != UserRole.Dispatcher)
            return true;

        return proposal.SubmittedById == _currentUser.UserId;
    }
}