using AutoMapper;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using PowderCoating.Application.Interfaces;
using PowderCoating.Core.Interfaces;
using PowderCoating.Shared.Constants;

namespace PowderCoating.Web.Controllers;

/// <summary>
/// Community formula library — browse published formulas from all companies and import
/// them into the current company's local template list.
/// </summary>
[Authorize(Policy = AppConstants.Policies.CanViewData)]
public class FormulaLibraryController : Controller
{
    private readonly IFormulaLibraryService _libraryService;
    private readonly ITenantContext _tenantContext;
    private readonly IMapper _mapper;
    private readonly IAzureBlobStorageService _blobStorage;

    public FormulaLibraryController(
        IFormulaLibraryService libraryService,
        ITenantContext tenantContext,
        IMapper mapper,
        IAzureBlobStorageService blobStorage)
    {
        _libraryService = libraryService;
        _tenantContext = tenantContext;
        _mapper = mapper;
        _blobStorage = blobStorage;
    }

    /// <summary>Browse the community library with optional search and filter params.</summary>
    // GET: /FormulaLibrary
    public async Task<IActionResult> Index(
        string? search = null,
        string? outputMode = null,
        string? industryHint = null)
    {
        var companyId = _tenantContext.GetCurrentCompanyId();
        if (companyId == null) return RedirectToAction("Index", "Home");

        var items = await _libraryService.BrowseAsync(companyId.Value, search, outputMode, industryHint);

        ViewBag.Search = search;
        ViewBag.OutputMode = outputMode;
        ViewBag.IndustryHint = industryHint;
        ViewBag.TotalCount = items.Count();

        return View(items);
    }

    /// <summary>Returns full detail JSON for the import preview modal.</summary>
    // GET: /FormulaLibrary/Detail/5
    [HttpGet]
    public async Task<IActionResult> Detail(int id)
    {
        var companyId = _tenantContext.GetCurrentCompanyId();
        if (companyId == null) return Json(new { error = "No company context." });

        var detail = await _libraryService.GetDetailAsync(id, companyId.Value);
        if (detail == null) return NotFound();

        return Json(detail);
    }

    /// <summary>
    /// Serves a formula diagram image by blob storage path. Used for library cards where the
    /// diagram belongs to another company's template blob container.
    /// </summary>
    // GET: /FormulaLibrary/Diagram?path=...
    [HttpGet]
    public async Task<IActionResult> Diagram(string path)
    {
        if (string.IsNullOrWhiteSpace(path)) return NotFound();

        // Sanitize: path must not escape the blob container
        if (path.Contains("..") || path.StartsWith("/") || path.StartsWith("\\"))
            return BadRequest();

        var (ok, bytes, contentType, _) = await _blobStorage.DownloadAsync("formulatemplate-diagrams", path);
        if (!ok || bytes == null || bytes.Length == 0) return NotFound();
        return File(bytes, contentType ?? "image/jpeg");
    }

    /// <summary>
    /// Records or toggles a thumbs-up/down vote for the current company.
    /// Returns updated counts so the UI can update without a page reload.
    /// Companies cannot rate their own formulas; own-formula cards have no rating buttons.
    /// </summary>
    // POST: /FormulaLibrary/Rate
    [HttpPost]
    [ValidateAntiForgeryToken]
    public async Task<IActionResult> Rate([FromBody] RateFormulaRequest request)
    {
        var companyId = _tenantContext.GetCurrentCompanyId();
        if (companyId == null) return Json(new { success = false, message = "No company context." });

        try
        {
            var (up, down, myVote) = await _libraryService.RateAsync(
                request.LibraryItemId, companyId.Value, request.IsPositive);
            return Json(new { success = true, thumbsUp = up, thumbsDown = down, myVote });
        }
        catch (InvalidOperationException ex)
        {
            return Json(new { success = false, message = ex.Message });
        }
    }

    /// <summary>Imports a library entry as a new local template for the current company.</summary>
    // POST: /FormulaLibrary/Import
    [HttpPost]
    [ValidateAntiForgeryToken]
    [Authorize(Policy = AppConstants.Policies.CompanyAdminOnly)]
    public async Task<IActionResult> Import(int libraryItemId)
    {
        var companyId = _tenantContext.GetCurrentCompanyId();
        if (companyId == null)
            return Json(new { success = false, message = "No company context." });

        try
        {
            var userId = User.FindFirst(System.Security.Claims.ClaimTypes.NameIdentifier)?.Value ?? "";
            var templateId = await _libraryService.ImportAsync(libraryItemId, companyId.Value, userId);
            return Json(new { success = true, templateId });
        }
        catch (Exception ex)
        {
            return Json(new { success = false, message = ex.Message });
        }
    }
}

/// <summary>Body for the Rate endpoint.</summary>
public class RateFormulaRequest
{
    public int LibraryItemId { get; set; }
    /// <summary>True = thumbs up, false = thumbs down.</summary>
    public bool IsPositive { get; set; }
}