<?php

namespace App\Http\Controllers\Admin;

use App\Models\Machine\Machine;
use Illuminate\Http\Request;
use Illuminate\View\View;

class MachineController extends AdminController
{
    /**
     * 顯示所有機台列表或效期管理
     */
    public function index(Request $request): View
    {
        $tab = $request->input('tab', 'list');
        $per_page = $tab === 'list' ? $request->input('per_page', 10) : $request->input('per_page', 12);
        
        $query = Machine::query();

        // 搜尋：名稱或序號
        if ($search = $request->input('search')) {
            $query->where(function ($q) use ($search) {
                $q->where('name', 'like', "%{$search}%")
                  ->orWhere('serial_no', 'like', "%{$search}%");
            });
        }

        if ($tab === 'list') {
            $machines = $query->when($request->status, function ($query, $status) {
                    return $query->where('status', $status);
                })
                ->latest()
                ->paginate($per_page)
                ->withQueryString();

            return view('admin.machines.index', compact('machines', 'tab'));
        } else {
            // 效期管理模式：獲取機台及其貨道統計
            $machines = $query->withCount(['slots as total_slots'])
                ->withCount(['slots as expired_count' => function ($q) {
                    $q->where('expiry_date', '<', now()->toDateString());
                }])
                ->withCount(['slots as pending_count' => function ($q) {
                    $q->whereNull('expiry_date');
                }])
                ->withCount(['slots as warning_count' => function ($q) {
                    $q->whereBetween('expiry_date', [now()->toDateString(), now()->addDays(7)->toDateString()]);
                }])
                ->latest()
                ->paginate($per_page)
                ->withQueryString();

            return view('admin.machines.index', compact('machines', 'tab'));
        }
    }

    /**
     * 顯示特定機台的日誌與詳細資訊
     */
    public function show(int $id): View
    {
        $machine = Machine::with(['logs' => function ($query) {
            $query->latest()->limit(50);
        }])->findOrFail($id);

        return view('admin.machines.show', compact('machine'));
    }


    /**
     * AJAX: 取得機台抽屜面板所需的歷程日誌
     */
    public function logsAjax(Request $request, Machine $machine)
    {
        $per_page = $request->input('per_page', 20);
        
        $startDate = $request->get('start_date', now()->format('Y-m-d'));
        $endDate = $request->get('end_date', now()->format('Y-m-d'));

        $logs = $machine->logs()
            ->when($request->level, function ($query, $level) {
                return $query->where('level', $level);
            })
            ->whereDate('created_at', '>=', $startDate)
            ->whereDate('created_at', '<=', $endDate)
            ->when($request->type, function ($query, $type) {
                return $query->where('type', $type);
            })
            ->latest()
            ->paginate($per_page);

        return response()->json([
            'success' => true,
            'data' => $logs->items(),
            'pagination' => [
                'total' => $logs->total(),
                'current_page' => $logs->currentPage(),
                'last_page' => $logs->lastPage(),
            ]
        ]);
    }


    /**
     * AJAX: 取得特定帳號的機台分配狀態
     */
    public function getAccountMachines(\App\Models\System\User $user)
    {
        $currentUser = auth()->user();

        // 安全檢查：只能操作自己公司的帳號（除非是系統管理員）
        if (!$currentUser->isSystemAdmin() && $user->company_id !== $currentUser->company_id) {
            return response()->json(['error' => 'Unauthorized'], 403);
        }

        // 取得該公司所有機台 (限定 company_id 以實作資料隔離)
        $machines = Machine::where('company_id', $user->company_id)
            ->get(['id', 'name', 'serial_no']);
            
        $assignedIds = $user->machines()->pluck('machines.id')->toArray();

        return response()->json([
            'user' => $user,
            'machines' => $machines,
            'assigned_ids' => $assignedIds
        ]);
    }

    /**
     * AJAX: 儲存特定帳號的機台分配
     */
    public function syncAccountMachines(Request $request, \App\Models\System\User $user)
    {
        $currentUser = auth()->user();

        // 安全檢查
        if (!$currentUser->isSystemAdmin() && $user->company_id !== $currentUser->company_id) {
            return response()->json(['error' => 'Unauthorized'], 403);
        }

        $request->validate([
            'machine_ids' => 'nullable|array',
            'machine_ids.*' => 'exists:machines,id'
        ]);

        // 加固驗證：確保所有機台 ID 都屬於該使用者的公司
        if ($request->has('machine_ids')) {
            $machineIds = array_unique($request->machine_ids);
            $validCount = Machine::where('company_id', $user->company_id)
                ->whereIn('id', $machineIds)
                ->count();
            
            if ($validCount !== count($machineIds)) {
                return response()->json(['error' => 'Invalid machine IDs provided.'], 422);
            }
        }

        $user->machines()->sync($request->machine_ids ?? []);

        return response()->json([
            'success' => true, 
            'message' => __('Permissions updated successfully.'),
            'assigned_machines' => $user->machines()->select('machines.id', 'machines.name', 'machines.serial_no')->get()
        ]);
    }

    /**
     * 機台使用率統計
     */
    public function utilization(Request $request): View
    {
        // 取得當前使用者有權限的所有機台 (已透過 Global Scope 過濾)
        $machines = Machine::all();

        return view('admin.machines.utilization', [
            'machines' => $machines
        ]);
    }

    /**
     * AJAX: 取得機台所有貨道資訊 (供效期管理視覺化圖表使用)
     */
    public function slotsAjax(Machine $machine)
    {
        $slots = $machine->slots()->with('product:id,name,image')->orderByRaw('CAST(slot_no AS UNSIGNED) ASC')->get();
        
        return response()->json([
            'success' => true,
            'machine' => $machine->only(['id', 'name', 'serial_no']),
            'slots' => $slots
        ]);
    }

    /**
     * AJAX: 更新貨道效期
     */
    public function updateSlotExpiry(Request $request, Machine $machine)
    {
        $request->validate([
            'slot_no' => 'required|integer',
            'expiry_date' => 'nullable|date',
            'apply_all_same_product' => 'boolean'
        ]);

        $slotNo = $request->slot_no;
        $expiryDate = $request->expiry_date;
        $applyAll = $request->apply_all_same_product ?? false;

        $slot = $machine->slots()->where('slot_no', $slotNo)->firstOrFail();
        $slot->update(['expiry_date' => $expiryDate]);

        if ($applyAll && $slot->product_id) {
            $machine->slots()
                ->where('product_id', $slot->product_id)
                ->update(['expiry_date' => $expiryDate]);
        }

        return response()->json([
            'success' => true,
            'message' => __('Expiry updated successfully.')
        ]);
    }

    /**
     * 取得機台統計數據 (AJAX)
     */
    public function utilizationData(int $id, Request $request)
    {
        $machine = Machine::findOrFail($id);
        $date = $request->get('date', now()->toDateString());

        $service = app(\App\Services\Machine\MachineService::class);
        $stats = $service->getUtilizationStats($machine, $date);

        return response()->json([
            'success' => true,
            'data' => $stats
        ]);
    }

    /**
     * 機台維護紀錄 (開發中)
     */
    public function maintenance(Request $request): View
    {
        return view('admin.machines.index', ['machines' => Machine::paginate(1)]); // Placeholder
    }
}