<?php

namespace App\Http\Controllers;

use App\Models\Wine;
use App\Models\GrapeVariety;
use App\Models\Harvest;
use App\Models\WineProduction;
use Illuminate\Http\Request;
use App\Http\Requests\StoreWineRequest;
use App\Http\Requests\UpdateWineRequest;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Storage;

class WineController extends Controller
{
    /**
     * Display a listing of wines.
     */
    public function index()
    {
        $wines = Wine::with('grapeVariety')
            ->orderBy('vintage', 'desc')
            ->paginate(15);

        return view('wines.index', compact('wines'));
    }

    /**
     * Display wine catalog for e-shop (with search and filters)
     */
    public function catalog(Request $request)
    {
        $query = Wine::with('grapeVariety')
            ->where('status', 'ready') // Only show wines marked as available for sale
            ->where('bottles_in_stock', '>', 0); // Only show wines in stock

        // Search by wine name
        if ($request->filled('search')) {
            $query->where('wine_name', 'like', '%' . $request->search . '%');
        }

        // Filter by grape variety
        if ($request->filled('variety') && $request->variety !== 'all') {
            $query->where('grape_variety_id', $request->variety);
        }

        // Filter by vintage
        if ($request->filled('vintage') && $request->vintage !== 'all') {
            $query->where('vintage', $request->vintage);
        }

        // Filter by wine type
        if ($request->filled('wine_type') && $request->wine_type !== 'all') {
            $query->where('wine_type', $request->wine_type);
        }

        // Filter by sweetness
        if ($request->filled('sweetness') && $request->sweetness !== 'all') {
            $query->where('sweetness', $request->sweetness);
        }

        $wines = $query->orderBy('vintage', 'desc')->paginate(12);

        // Get all grape varieties for filter dropdown (distinct by name to avoid duplicates)
        $grapeVarieties = GrapeVariety::all()
            ->unique('variety_name')
            ->sortBy('variety_name')
            ->values();

        // Get all unique vintages for filter dropdown
        $vintages = Wine::where('status', 'ready')
            ->where('bottles_in_stock', '>', 0)
            ->distinct()
            ->pluck('vintage')
            ->sort()
            ->values();

        // Get all unique wine types for filter dropdown
        $wineTypes = Wine::where('status', 'ready')
            ->where('bottles_in_stock', '>', 0)
            ->whereNotNull('wine_type')
            ->distinct()
            ->pluck('wine_type')
            ->values();

        // Get all unique sweetness levels for filter dropdown
        $sweetnessLevels = Wine::where('status', 'ready')
            ->where('bottles_in_stock', '>', 0)
            ->whereNotNull('sweetness')
            ->distinct()
            ->pluck('sweetness')
            ->values();

        return view('catalog.index', compact('wines', 'grapeVarieties', 'vintages', 'wineTypes', 'sweetnessLevels'));
    }

    /**
     * Show the form for creating a new wine.
     */
    public function create()
    {
        $grapeVarieties = GrapeVariety::all();

        return view('wines.create', compact('grapeVarieties'));
    }

    /**
     * Store a newly created wine in storage.
     */
    public function store(StoreWineRequest $request)
    {
        $validated = $request->validated();

        $wine = Wine::create($validated);

        return redirect()->route('wines.show', $wine)
            ->with('success', 'Wine created successfully.');
    }

    /**
     * Display the specified wine.
     */
    public function show($id)
    {
        $wine = Wine::with('grapeVariety', 'harvests.plannedTask')->findOrFail($id);

        // Check if this is a catalog request (from the route)
        if (request()->route()->getName() === 'catalog.show') {
            return view('catalog.show', compact('wine'));
        }

        return view('wines.show', compact('wine'));
    }

    /**
     * Show the form for editing the specified wine.
     */
    public function edit(Wine $wine)
    {
        $grapeVarieties = GrapeVariety::all();

        return view('wines.edit', compact('wine', 'grapeVarieties'));
    }

    /**
     * Update the specified wine in storage.
     */
    public function update(UpdateWineRequest $request, Wine $wine)
    {
        $validated = $request->validated();

        // Handle image upload
        if ($request->hasFile('image')) {
            // Delete old image if exists
            if ($wine->image_url) {
                \Storage::disk('public')->delete($wine->image_url);
            }
            $validated['image_url'] = $request->file('image')->store('wines', 'public');
        }

        // Remove the 'image' key from validated data (we only want 'image_url')
        unset($validated['image']);

        $wine->update($validated);

        return redirect()->route('wines.show', $wine)
            ->with('success', 'Wine updated successfully.');
    }

    /**
     * Remove the specified wine from storage.
     */
    public function destroy(Wine $wine)
    {
        $wineName = $wine->wine_name;
        $wine->delete();

        return redirect()->route('winemaker.cellar.index')
            ->with('success', "Wine '{$wineName}' has been permanently removed from the cellar.");
    }

    /**
     * Display cellar wine inventory (for winemaker)
     */
    public function cellarIndex()
    {
        $wines = Wine::with('grapeVariety')
            ->orderBy('vintage', 'desc')
            ->orderBy('wine_name')
            ->get();

        return view('winemaker.cellar.index', compact('wines'));
    }

    /**
     * Display wines available for sales management (for winemaker)
     */
    public function salesIndex()
    {
        $wines = Wine::with('grapeVariety')
            ->where('bottles_in_stock', '>', 0)
            ->orderBy('vintage', 'desc')
            ->orderBy('wine_name')
            ->paginate(15);

        return view('winemaker.sales.index', compact('wines'));
    }

    /**
     * Add wine to sales (mark as available)
     */
    public function addToSales($id)
    {
        $wine = Wine::findOrFail($id);

        if ($wine->status === 'in_production') {
            return redirect()->back()->with('error', 'Cannot add wine that is still in production to catalog.');
        }

        if ($wine->bottles_in_stock <= 0) {
            return redirect()->back()->with('error', 'Cannot add wine without stock to catalog.');
        }

        if (!$wine->price_per_bottle) {
            return redirect()->back()->with('error', 'Please set a price before adding wine to catalog.');
        }

        $wine->update(['status' => 'ready']);

        return redirect()->back()->with('success', 'Wine has been added to the catalog.');
    }

    /**
     * Remove wine from sales (mark as not available)
     */
    public function removeFromSales($id)
    {
        $wine = Wine::findOrFail($id);

        $wine->update(['status' => 'aging']);

        return redirect()->back()->with('success', 'Wine has been removed from the catalog.');
    }

    /**
     * Show form to create blended wine from multiple harvests
     */
    public function createBlendForm()
    {
        $availableHarvests = Harvest::with(['varietyVariation.grapeVariety', 'wineProductions', 'plannedTask'])
            ->where(function ($query) {
                $query->whereHas('plannedTask', function ($sub) {
                    $sub->whereNotNull('execution_date');
                })->orWhereDoesntHave('plannedTask');
            })
            ->get()
            ->filter(function ($harvest) {
                return $harvest->remaining_weight > 0.01;
            })
            ->sortByDesc(function ($harvest) {
                return $harvest->plannedTask?->execution_date ?? $harvest->date;
            });

        return view('winemaker.cellar.create-blend', compact('availableHarvests'));
    }

    /**
     * Store a new blended wine from multiple harvests
     */
    public function storeBlend(Request $request)
    {
        $validated = $request->validate([
            'harvests' => 'required|array|min:1',
            'harvests.*.selected' => 'sometimes',
            'harvests.*.weight' => 'required_with:harvests.*.selected|numeric|min:0.01',
            'wine_name' => 'required|string|max:255',
            'vintage' => 'required|integer|min:1900|max:' . (date('Y') + 1),
            'wine_type' => 'required|in:red,white,rose',
            'sweetness' => 'required|in:dry,semi_dry,semi_sweet,sweet',
            'alcohol_percentage' => 'required|numeric|min:0|max:20',
            'bottles_produced' => 'required|integer|min:1',
            'bottle_volume' => 'nullable|numeric|min:0.1|max:10',
            'production_date' => 'required|date',
            'bottling_date' => 'nullable|date',
            'status' => 'required|in:in_production,aging,ready,sold_out',
            'price_per_bottle' => 'nullable|numeric|min:0',
            'description' => 'nullable|string',
            'image' => 'nullable|image|mimes:jpeg,jpg,png,webp|max:2048',
        ]);

        try {
            DB::beginTransaction();

            // Filter selected harvests and calculate total weight
            $selectedHarvests = [];
            $totalWeight = 0;

            foreach ($validated['harvests'] as $harvestId => $data) {
                if (isset($data['selected']) && isset($data['weight']) && $data['weight'] > 0) {
                    $harvest = Harvest::with('varietyVariation.grapeVariety')->findOrFail($harvestId);

                    // Validate weight
                    if ($data['weight'] > $harvest->remaining_weight) {
                        return back()
                            ->withInput()
                            ->with('error', 'Harvest #' . $harvestId . ': Cannot use ' . $data['weight'] . ' kg. Only ' . number_format($harvest->remaining_weight, 2) . ' kg available.');
                    }

                    $selectedHarvests[] = [
                        'harvest' => $harvest,
                        'weight' => $data['weight']
                    ];
                    $totalWeight += $data['weight'];
                }
            }

            if (count($selectedHarvests) === 0) {
                return back()
                    ->withInput()
                    ->with('error', 'Please select at least one harvest with a weight.');
            }

            // Determine primary grape variety (from harvest with highest weight)
            $primaryHarvest = collect($selectedHarvests)->sortByDesc('weight')->first();
            $grapeVariety = $primaryHarvest['harvest']->varietyVariation->grapeVariety;

            // Handle image upload
            $imagePath = null;
            if ($request->hasFile('image')) {
                $imagePath = $request->file('image')->store('wines', 'public');
            }

            // Create the wine
            $wine = Wine::create([
                'wine_name' => $validated['wine_name'],
                'vintage' => $validated['vintage'],
                'grape_variety_id' => $grapeVariety->id,
                'wine_type' => $validated['wine_type'],
                'sweetness' => $validated['sweetness'],
                'alcohol_percentage' => $validated['alcohol_percentage'],
                'bottles_produced' => $validated['bottles_produced'],
                'bottles_in_stock' => $validated['bottles_produced'],
                'bottle_volume' => $validated['bottle_volume'] ?? 0.75,
                'production_date' => $validated['production_date'],
                'bottling_date' => $validated['bottling_date'],
                'status' => $validated['status'],
                'price_per_bottle' => $validated['price_per_bottle'],
                'description' => $validated['description'],
                'image_url' => $imagePath,
            ]);

            // Create wine production records for each harvest
            $harvestIds = [];
            foreach ($selectedHarvests as $item) {
                $blendPercentage = ($item['weight'] / $totalWeight) * 100;

                WineProduction::create([
                    'wine_id' => $wine->id,
                    'harvest_id' => $item['harvest']->id,
                    'consumed_weight' => $item['weight'],
                    'blend_percentage' => $blendPercentage,
                ]);

                $harvestIds[] = '#' . $item['harvest']->id;
            }

            DB::commit();

            $message = 'Blended wine created successfully from ' . count($selectedHarvests) . ' harvest(s): ' . implode(', ', $harvestIds);
            $message .= '. Total blend: ' . number_format($totalWeight, 2) . ' kg';

            return redirect()->route('winemaker.cellar.index')
                ->with('success', $message);

        } catch (\Exception $e) {
            DB::rollBack();
            return back()
                ->withInput()
                ->with('error', 'Failed to create blended wine: ' . $e->getMessage());
        }
    }
}