<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use Illuminate\Http\Request;

class PermissionController extends Controller
{
    // 權限角色設定
    public function roles()
    {
        $per_page = request()->input('per_page', 10);
        $user = auth()->user();
        $query = \App\Models\System\Role::query()->with(['permissions', 'users']);

        // 租戶隔離：租戶只能看到自己公司的角色 + 系統角色 (company_id is null)
        if (!$user->isSystemAdmin()) {
            $query->where(function($q) use ($user) {
                $q->where('company_id', $user->company_id)
                  ->orWhereNull('company_id');
            });
        }

        // 搜尋：角色名稱
        if ($search = request()->input('search')) {
            $query->where('name', 'like', "%{$search}%");
        }

        $roles = $query->latest()->paginate($per_page)->withQueryString();
        $all_permissions = \Spatie\Permission\Models\Permission::all()
            ->filter(function($perm) {
                // 排除子項目的權限，只顯示主選單權限
                $excluded = [
                    'menu.basic.machines',
                    'menu.basic.payment-configs',
                    'menu.companies',
                    'menu.accounts',
                    'menu.roles',
                ];
                return !in_array($perm->name, $excluded);
            })
            ->groupBy(function($perm) {
                if (str_starts_with($perm->name, 'menu.')) {
                    return 'menu';
                }
                return 'other';
            });
        
        // 根據路由決定標題
        $title = request()->routeIs('*.sub-account-roles') ? __('Sub Account Roles') : __('Role Settings');

        return view('admin.permission.roles', compact('roles', 'all_permissions', 'title'));
    }

    /**
     * Store a newly created role in storage.
     */
    public function storeRole(Request $request)
    {
        $validated = $request->validate([
            'name' => 'required|string|max:255|unique:roles,name',
            'permissions' => 'nullable|array',
            'permissions.*' => 'string|exists:permissions,name',
        ]);

        $is_system = auth()->user()->isSystemAdmin() && $request->boolean('is_system');

        $role = \App\Models\System\Role::create([
            'name' => $validated['name'],
            'guard_name' => 'web',
            'company_id' => $is_system ? null : auth()->user()->company_id,
            'is_system' => $is_system,
        ]);

        if (!empty($validated['permissions'])) {
            $perms = $validated['permissions'];
            // 如果不是系統角色，排除主選單的系統權限
            if (!$is_system) {
                $perms = array_diff($perms, ['menu.basic-settings', 'menu.permissions']);
            }
            $role->syncPermissions($perms);
        }

        return redirect()->back()->with('success', __('Role created successfully.'));
    }

    /**
     * Update the specified role in storage.
     */
    public function updateRole(Request $request, $id)
    {
        $role = \App\Models\System\Role::findOrFail($id);

        $validated = $request->validate([
            'name' => 'required|string|max:255|unique:roles,name,' . $id,
            'permissions' => 'nullable|array',
            'permissions.*' => 'string|exists:permissions,name',
        ]);

        if ($role->name === 'super-admin') {
             return redirect()->back()->with('error', __('The Super Admin role is immutable.'));
        }

        if (!auth()->user()->isSystemAdmin() && $role->is_system) {
             return redirect()->back()->with('error', __('System roles cannot be modified by tenant administrators.'));
        }

        $is_system = auth()->user()->isSystemAdmin() ? $request->boolean('is_system') : $role->is_system;

        $role->update([
            'name' => $validated['name'],
            'is_system' => $is_system,
            'company_id' => $is_system ? null : $role->company_id,
        ]);

        $perms = $validated['permissions'] ?? [];
        // 如果不是系統角色，排除主選單的系統權限
        if (!$is_system) {
            $perms = array_diff($perms, ['menu.basic-settings', 'menu.permissions']);
        }
        $role->syncPermissions($perms);

        return redirect()->back()->with('success', __('Role updated successfully.'));
    }

    /**
     * Remove the specified role from storage.
     */
    public function destroyRole($id)
    {
        $role = \App\Models\System\Role::findOrFail($id);

        if ($role->name === 'super-admin') {
            return redirect()->back()->with('error', __('The Super Admin role cannot be deleted.'));
        }

        if (!auth()->user()->isSystemAdmin() && $role->is_system) {
            return redirect()->back()->with('error', __('System roles cannot be deleted by tenant administrators.'));
        }

        if ($role->users()->count() > 0) {
            return redirect()->back()->with('error', __('Cannot delete role with active users.'));
        }

        $role->delete();

        return redirect()->back()->with('success', __('Role deleted successfully.'));
    }

    // 帳號管理
    public function accounts(Request $request)
    {
        $query = \App\Models\System\User::query()->with(['company', 'roles']);

        // 租戶隔離：如果不是系統管理員，則只看自己公司的成員
        if (!auth()->user()->isSystemAdmin()) {
            $query->where('company_id', auth()->user()->company_id);
        }

        // 搜尋
        if ($search = $request->input('search')) {
            $query->where(function($q) use ($search) {
                $q->where('name', 'like', "%{$search}%")
                  ->orWhere('username', 'like', "%{$search}%")
                  ->orWhere('email', 'like', "%{$search}%");
            });
        }

        // 公司篩選 (僅限 super-admin)
        if (auth()->user()->isSystemAdmin() && $request->filled('company_id')) {
            $query->where('company_id', $request->company_id);
        }

        $per_page = $request->input('per_page', 10);
        $users = $query->latest()->paginate($per_page)->withQueryString();
        $companies = auth()->user()->isSystemAdmin() ? \App\Models\System\Company::all() : collect();
        $roles_query = \App\Models\System\Role::where('name', '!=', 'super-admin');
        if (!auth()->user()->isSystemAdmin()) {
            $roles_query->where(function($q) {
                $q->where('company_id', auth()->user()->company_id)
                  ->orWhereNull('company_id');
            });
        }
        $roles = $roles_query->get();

        // 根據路由決定標題
        $title = request()->routeIs('*.sub-accounts') ? __('Sub Account Management') : __('Account Management');

        return view('admin.data-config.accounts', compact('users', 'companies', 'roles', 'title'));
    }

    /**
     * Store a newly created account in storage.
     */
    public function storeAccount(Request $request)
    {
        $validated = $request->validate([
            'name' => 'required|string|max:255',
            'username' => 'required|string|max:255|unique:users,username',
            'email' => 'nullable|email|max:255|unique:users,email',
            'password' => 'required|string|min:8',
            'role' => 'required|string',
            'status' => 'required|boolean',
            'company_id' => 'nullable|exists:companies,id',
            'phone' => 'nullable|string|max:20',
        ]);

        $user = \App\Models\System\User::create([
            'name' => $validated['name'],
            'username' => $validated['username'],
            'email' => $validated['email'],
            'password' => \Illuminate\Support\Facades\Hash::make($validated['password']),
            'status' => $validated['status'],
            'company_id' => auth()->user()->isSystemAdmin() ? $validated['company_id'] : auth()->user()->company_id,
            'phone' => $validated['phone'],
        ]);

        $user->assignRole($validated['role']);

        return redirect()->back()->with('success', __('Account created successfully.'));
    }

    /**
     * Update the specified account in storage.
     */
    public function updateAccount(Request $request, $id)
    {
        $user = \App\Models\System\User::findOrFail($id);

        if ($user->hasRole('super-admin')) {
            return redirect()->back()->with('error', __('System super admin accounts cannot be modified via this interface.'));
        }

        $validated = $request->validate([
            'name' => 'required|string|max:255',
            'username' => 'required|string|max:255|unique:users,username,' . $id,
            'email' => 'nullable|email|max:255|unique:users,email,' . $id,
            'password' => 'nullable|string|min:8',
            'role' => 'required|string',
            'status' => 'required|boolean',
            'company_id' => 'nullable|exists:companies,id',
            'phone' => 'nullable|string|max:20',
        ]);

        $updateData = [
            'name' => $validated['name'],
            'username' => $validated['username'],
            'email' => $validated['email'],
            'status' => $validated['status'],
            'phone' => $validated['phone'],
        ];

        if (auth()->user()->isSystemAdmin()) {
            // 防止超級管理員不小心把自己綁定到租客公司或降級
            if ($user->id === auth()->id()) {
                $updateData['company_id'] = null;
                $validated['role'] = 'super-admin';
            } else {
                $updateData['company_id'] = $validated['company_id'];
            }
        }

        if (!empty($validated['password'])) {
            $updateData['password'] = \Illuminate\Support\Facades\Hash::make($validated['password']);
        }

        $user->update($updateData);

        // 如果是編輯自己且原本是超級管理員，強制保留 super-admin 角色
        if ($user->id === auth()->id() && auth()->user()->isSystemAdmin()) {
            $user->syncRoles(['super-admin']);
        } else {
            $user->syncRoles([$validated['role']]);
        }

        return redirect()->back()->with('success', __('Account updated successfully.'));
    }

    /**
     * Remove the specified account from storage.
     */
    public function destroyAccount($id)
    {
        $user = \App\Models\System\User::findOrFail($id);
        
        if ($user->hasRole('super-admin')) {
            return redirect()->back()->with('error', __('System super admin accounts cannot be deleted.'));
        }

        if ($user->id === auth()->id()) {
            return redirect()->back()->with('error', __('You cannot delete your own account.'));
        }

        $user->delete();

        return redirect()->back()->with('success', __('Account deleted successfully.'));
    }
}