<?php

namespace App\Http\Controllers;

use App\Models\Employee;
use App\Models\User;
use App\Models\EmployeeGoal;
use App\Models\GoalType;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\Validator;
use Inertia\Inertia;

class EmployeeGoalController extends Controller
{
    /**
     * Display a listing of the resource.
     */
    public function index(Request $request)
    {
        if (Auth::user()->can('manage-employee-goals')) {
            $query = EmployeeGoal::with(['employee', 'goalType'])
                ->where(function ($q) {
                    if (Auth::user()->can('manage-any-employee-goals')) {
                        $q->whereIn('created_by',  getCompanyAndUsersId());
                    } elseif (Auth::user()->can('manage-own-employee-goals')) {
                        $q->where('created_by', Auth::id())->orWhere('employee_id', Auth::id());
                    } else {
                        $q->whereRaw('1 = 0');
                    }
                });

            // Handle search
            if ($request->has('search') && !empty($request->search)) {
                $query->where(function ($q) use ($request) {
                    $q->where('title', 'like', '%' . $request->search . '%')
                        ->orWhere('description', 'like', '%' . $request->search . '%')
                        ->orWhere('target', 'like', '%' . $request->search . '%')
                        ->orWhereHas('employee', function ($q) use ($request) {
                            $q->where('name', 'like', '%' . $request->search . '%')
                                ->orWhere('employee_id', 'like', '%' . $request->search . '%');
                        });
                });
            }

            // Handle employee filter
            if ($request->has('employee_id') && !empty($request->employee_id)) {
                $query->where('employee_id', $request->employee_id);
            }

            // Handle goal type filter
            if ($request->has('goal_type_id') && !empty($request->goal_type_id)) {
                $query->where('goal_type_id', $request->goal_type_id);
            }

            // Handle status filter
            if ($request->has('status') && !empty($request->status) && $request->status !== 'all') {
                $query->where('status', $request->status);
            }

            // Handle sorting
            $sortField = $request->get('sort_field', 'created_at');
            $sortDirection = $request->get('sort_direction', 'desc');
            
            // Validate sort field
            $allowedSortFields = ['title', 'start_date', 'end_date', 'created_at', 'id'];
            if (!in_array($sortField, $allowedSortFields)) {
                $sortField = 'created_at';
            }
            
            $query->orderBy($sortField, $sortDirection);

            $goals = $query->paginate($request->per_page ?? 10);


            // Get goal types for filter dropdown
            $goalTypes = GoalType::whereIn('created_by', getCompanyAndUsersId())
                ->where('status', 'active')
                ->orderBy('name')
                ->get(['id', 'name']);

            return Inertia::render('hr/performance/employee-goals/index', [
                'goals' => $goals,
                'employees' => $this->getFilteredEmployees(),
                'goalTypes' => $goalTypes,
                'filters' => $request->all(['search', 'employee_id', 'goal_type_id', 'status', 'sort_field', 'sort_direction', 'per_page']),
            ]);
        } else {
            return redirect()->back()->with('error', __('Permission Denied.'));
        }
    }
    private function getFilteredEmployees()
    {
        // Get employees for filter dropdown (compatible with getFilteredEmployees logic)
        $employeeQuery = Employee::whereIn('created_by', getCompanyAndUsersId());

        if (Auth::user()->can('manage-own-employee-goals') && !Auth::user()->can('manage-any-employee-goals')) {
            $employeeQuery->where(function ($q) {
                $q->where('created_by', Auth::id())->orWhere('user_id', Auth::id());
            });
        }

        $employees = User::emp()
            ->with('employee')
            ->whereIn('created_by', getCompanyAndUsersId())
            ->where('status', 'active')
            ->whereIn('id', $employeeQuery->pluck('user_id'))
            ->select('id', 'name')
            ->get()
            ->map(function ($user) {
                return [
                    'id' => $user->id,
                    'name' => $user->name,
                    'employee_id' => $user->employee->employee_id ?? ''
                ];
            });
        return $employees;
    }
    public function store(Request $request)
    {
        if (Auth::user()->can('create-employee-goals')) {
            $validator = Validator::make($request->all(), [
                'employee_id' => 'required|exists:users,id',
                'goal_type_id' => 'required|exists:goal_types,id',
                'title' => 'required|string|max:255',
                'description' => 'nullable|string',
                'start_date' => 'required|date',
                'end_date' => 'required|date|after_or_equal:start_date',
                'target' => 'nullable|string|max:255',
                'progress' => 'nullable|integer|min:0|max:100',
                'status' => 'nullable|string|in:not_started,in_progress,completed',
            ]);

            if ($validator->fails()) {
                return redirect()->back()->withErrors($validator)->withInput();
            }

            // Verify employee belongs to current company
            $employee = User::find($request->employee_id);
            if (!$employee || !in_array($employee->created_by, getCompanyAndUsersId())) {
                return redirect()->back()->with('error', __('Invalid employee selected'))->withInput();
            }

            // Verify goal type belongs to current company
            $goalType = GoalType::find($request->goal_type_id);
            if (!$goalType || !in_array($goalType->created_by, getCompanyAndUsersId())) {
                return redirect()->back()->with('error', __('Invalid goal type selected'))->withInput();
            }

            EmployeeGoal::create([
                'employee_id' =>  $employee->id,
                'goal_type_id' => $request->goal_type_id,
                'title' => $request->title,
                'description' => $request->description,
                'start_date' => $request->start_date,
                'end_date' => $request->end_date,
                'target' => $request->target,
                'progress' => $request->progress ?? 0,
                'status' => $request->status ?? 'not_started',
                'created_by' => creatorId(),
            ]);

            return redirect()->back()->with('success', __('Employee goal created successfully'));
        } else {
            return redirect()->back()->with('error', __('Permission Denied.'));
        }
    }

    /**
     * Update the specified resource in storage.
     */
    public function update(Request $request, EmployeeGoal $employeeGoal)
    {
        if (Auth::user()->can('edit-employee-goals')) {
            // Check if goal belongs to current company
            if (!in_array($employeeGoal->created_by, getCompanyAndUsersId())) {
                return redirect()->back()->with('error', __('You do not have permission to update this goal'));
            }

            $validator = Validator::make($request->all(), [
                'employee_id' => 'required|exists:users,id',
                'goal_type_id' => 'required|exists:goal_types,id',
                'title' => 'required|string|max:255',
                'description' => 'nullable|string',
                'start_date' => 'required|date',
                'end_date' => 'required|date|after_or_equal:start_date',
                'target' => 'nullable|string|max:255',
                'progress' => 'nullable|integer|min:0|max:100',
                'status' => 'nullable|string|in:not_started,in_progress,completed',
            ]);

            if ($validator->fails()) {
                return redirect()->back()->withErrors($validator)->withInput();
            }

            // Verify employee belongs to current company
            $employee = User::find($request->employee_id);
            if (!$employee || !in_array($employee->created_by, getCompanyAndUsersId())) {
                return redirect()->back()->with('error', __('Invalid employee selected'))->withInput();
            }

            // Verify goal type belongs to current company
            $goalType = GoalType::find($request->goal_type_id);
            if (!$goalType || !in_array($goalType->created_by, getCompanyAndUsersId())) {
                return redirect()->back()->with('error', __('Invalid goal type selected'))->withInput();
            }

            $employeeGoal->update([
                'employee_id' => $employee->id,
                'goal_type_id' => $request->goal_type_id,
                'title' => $request->title,
                'description' => $request->description,
                'start_date' => $request->start_date,
                'end_date' => $request->end_date,
                'target' => $request->target,
                'progress' => $request->progress ?? $employeeGoal->progress,
                'status' => $request->status ?? $employeeGoal->status,
            ]);

            return redirect()->back()->with('success', __('Employee goal updated successfully'));
        } else {
            return redirect()->back()->with('error', __('Permission Denied.'));
        }
    }

    /**
     * Remove the specified resource from storage.
     */
    public function destroy(EmployeeGoal $employeeGoal)
    {
        if (Auth::user()->can('delete-employee-goals')) {
            // Check if goal belongs to current company
            if (!in_array($employeeGoal->created_by, getCompanyAndUsersId())) {
                return redirect()->back()->with('error', __('You do not have permission to delete this goal'));
            }

            $employeeGoal->delete();

            return redirect()->back()->with('success', __('Employee goal deleted successfully'));
        } else {
            return redirect()->back()->with('error', __('Permission Denied.'));
        }
    }

    /**
     * Update the progress of the specified resource.
     */
    public function updateProgress(Request $request, EmployeeGoal $employeeGoal)
    {
        if (Auth::user()->can('edit-employee-goals')) {
            // Check if goal belongs to current company
            if (!in_array($employeeGoal->created_by, getCompanyAndUsersId())) {
                return redirect()->back()->with('error', __('You do not have permission to update this goal'));
            }

            $validator = Validator::make($request->all(), [
                'progress' => 'required|integer|min:0|max:100',
            ]);

            if ($validator->fails()) {
                return redirect()->back()->withErrors($validator)->withInput();
            }

            // Update progress and status based on progress value
            $status = $employeeGoal->status;
            if ($request->progress == 100) {
                $status = 'completed';
            } elseif ($request->progress > 0) {
                $status = 'in_progress';
            } elseif ($request->progress == 0) {
                $status = 'not_started';
            }

            $employeeGoal->update([
                'progress' => $request->progress,
                'status' => $status,
            ]);

            return redirect()->back()->with('success', __('Goal progress updated successfully'));
        } else {
            return redirect()->back()->with('error', __('Permission Denied.'));
        }
    }
}