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

namespace PowderCoating.Web.Controllers;

/// <summary>
/// SuperAdmin-only CRUD interface for managing global ManufacturerLookupPattern records.
/// These records have CompanyId = 0 and are shared across all tenants.
/// </summary>
[Authorize(Policy = AppConstants.Policies.SuperAdminOnly)]
public class ManufacturerLookupPatternsController : Controller
{
    private readonly IUnitOfWork _unitOfWork;
    private readonly ILogger<ManufacturerLookupPatternsController> _logger;

    public ManufacturerLookupPatternsController(
        IUnitOfWork unitOfWork,
        ILogger<ManufacturerLookupPatternsController> logger)
    {
        _unitOfWork = unitOfWork;
        _logger = logger;
    }

    /// <summary>
    /// Displays all non-deleted manufacturer lookup patterns ordered alphabetically.
    /// Uses <c>ignoreQueryFilters: true</c> because these records carry
    /// <c>CompanyId = 0</c> and would otherwise be filtered out by the
    /// multi-tenancy global query filter.
    /// </summary>
    public async Task<IActionResult> Index()
    {
        try
        {
            var patterns = await _unitOfWork.ManufacturerLookupPatterns.GetAllAsync(ignoreQueryFilters: true);
            var ordered = patterns
                .Where(p => !p.IsDeleted)
                .OrderBy(p => p.ManufacturerName)
                .ToList();
            return View(ordered);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error retrieving manufacturer lookup patterns");
            TempData["Error"] = "An error occurred while loading manufacturer lookup patterns.";
            return View(new List<ManufacturerLookupPattern>());
        }
    }

    /// <summary>
    /// Returns the Create form pre-populated with sensible defaults:
    /// <c>SlugTransform = "LowerHyphen"</c> (the most common URL slug format for
    /// manufacturer product pages) and <c>IsActive = true</c>.
    /// </summary>
    // GET: ManufacturerLookupPatterns/Create
    public IActionResult Create()
    {
        return View(new ManufacturerLookupPattern
        {
            SlugTransform = "LowerHyphen",
            IsActive = true
        });
    }

    /// <summary>
    /// Persists a new manufacturer lookup pattern.  Forces <c>CompanyId = 0</c>
    /// regardless of the current user's company because these patterns are global
    /// — they are shared by <c>InventoryAiLookupService</c> across all tenants.
    /// </summary>
    // POST: ManufacturerLookupPatterns/Create
    [HttpPost]
    [ValidateAntiForgeryToken]
    public async Task<IActionResult> Create(ManufacturerLookupPattern item)
    {
        if (!ModelState.IsValid)
        {
            return View(item);
        }

        try
        {
            item.CompanyId = 0;
            item.CreatedAt = DateTime.UtcNow;

            await _unitOfWork.ManufacturerLookupPatterns.AddAsync(item);
            await _unitOfWork.SaveChangesAsync();

            TempData["Success"] = $"Manufacturer pattern for \"{item.ManufacturerName}\" created successfully.";
            return RedirectToAction(nameof(Index));
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error creating manufacturer lookup pattern");
            TempData["Error"] = "An error occurred while creating the pattern.";
            return View(item);
        }
    }

    /// <summary>
    /// Returns the Edit form for an existing pattern.  Fetches with
    /// <c>ignoreQueryFilters: true</c> so the <c>CompanyId = 0</c> records are
    /// visible, then checks <c>IsDeleted</c> manually to prevent editing soft-deleted records.
    /// </summary>
    // GET: ManufacturerLookupPatterns/Edit/5
    public async Task<IActionResult> Edit(int? id)
    {
        if (id == null)
        {
            return NotFound();
        }

        try
        {
            var patterns = await _unitOfWork.ManufacturerLookupPatterns.GetAllAsync(ignoreQueryFilters: true);
            var item = patterns.FirstOrDefault(p => p.Id == id.Value && !p.IsDeleted);
            if (item == null)
            {
                return NotFound();
            }

            return View(item);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error retrieving manufacturer lookup pattern {Id} for edit", id);
            TempData["Error"] = "An error occurred while loading the pattern.";
            return RedirectToAction(nameof(Index));
        }
    }

    /// <summary>
    /// Applies the edited field values to the tracked entity and saves.
    /// Only whitelisted fields are copied from the posted model (manual mapping)
    /// to prevent over-posting — particularly to keep <c>CompanyId = 0</c> immutable
    /// and prevent an attacker from hijacking the pattern to a specific tenant.
    /// </summary>
    // POST: ManufacturerLookupPatterns/Edit/5
    [HttpPost]
    [ValidateAntiForgeryToken]
    public async Task<IActionResult> Edit(int id, ManufacturerLookupPattern item)
    {
        if (id != item.Id)
        {
            return NotFound();
        }

        if (!ModelState.IsValid)
        {
            return View(item);
        }

        try
        {
            var patterns = await _unitOfWork.ManufacturerLookupPatterns.GetAllAsync(ignoreQueryFilters: true);
            var existing = patterns.FirstOrDefault(p => p.Id == id && !p.IsDeleted);
            if (existing == null)
            {
                return NotFound();
            }

            existing.ManufacturerName = item.ManufacturerName;
            existing.Domain = item.Domain;
            existing.ProductUrlTemplate = item.ProductUrlTemplate;
            existing.SlugTransform = item.SlugTransform;
            existing.IsActive = item.IsActive;
            existing.Notes = item.Notes;
            existing.UpdatedAt = DateTime.UtcNow;

            await _unitOfWork.ManufacturerLookupPatterns.UpdateAsync(existing);
            await _unitOfWork.SaveChangesAsync();

            TempData["Success"] = $"Pattern for \"{existing.ManufacturerName}\" updated successfully.";
            return RedirectToAction(nameof(Index));
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error updating manufacturer lookup pattern {Id}", id);
            TempData["Error"] = "An error occurred while updating the pattern.";
            return View(item);
        }
    }

    /// <summary>
    /// Returns the Delete confirmation view for a pattern, verifying that the record
    /// exists and is not already soft-deleted before showing the destructive action.
    /// </summary>
    // GET: ManufacturerLookupPatterns/Delete/5
    public async Task<IActionResult> Delete(int? id)
    {
        if (id == null)
        {
            return NotFound();
        }

        try
        {
            var patterns = await _unitOfWork.ManufacturerLookupPatterns.GetAllAsync(ignoreQueryFilters: true);
            var item = patterns.FirstOrDefault(p => p.Id == id.Value && !p.IsDeleted);
            if (item == null)
            {
                return NotFound();
            }

            return View(item);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error retrieving manufacturer lookup pattern {Id} for delete", id);
            TempData["Error"] = "An error occurred while loading the pattern.";
            return RedirectToAction(nameof(Index));
        }
    }

    /// <summary>
    /// Soft-deletes the pattern (sets <c>IsDeleted = true</c>) rather than physically
    /// removing it.  Soft delete is preferred so that historical AI lookup results that
    /// referenced this pattern remain traceable even after the record is retired.
    /// </summary>
    // POST: ManufacturerLookupPatterns/Delete/5
    [HttpPost, ActionName("Delete")]
    [ValidateAntiForgeryToken]
    public async Task<IActionResult> DeleteConfirmed(int id)
    {
        try
        {
            var patterns = await _unitOfWork.ManufacturerLookupPatterns.GetAllAsync(ignoreQueryFilters: true);
            var item = patterns.FirstOrDefault(p => p.Id == id && !p.IsDeleted);
            if (item == null)
            {
                return NotFound();
            }

            await _unitOfWork.ManufacturerLookupPatterns.SoftDeleteAsync(item);
            await _unitOfWork.SaveChangesAsync();

            TempData["Success"] = $"Pattern for \"{item.ManufacturerName}\" deleted successfully.";
            return RedirectToAction(nameof(Index));
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error deleting manufacturer lookup pattern {Id}", id);
            TempData["Error"] = "An error occurred while deleting the pattern.";
            return RedirectToAction(nameof(Index));
        }
    }
}