<?php

namespace App\Http\Controllers;

use App\Http\Requests\StoreEmployeeRequest;
use App\Models\Employee;
use App\Models\Project;
use App\Models\Currency;
use App\Helpers\CurrencyHelper;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;

class EmployeeController extends Controller
{
    /**
     * Display a listing of employees with filters.
     */
    public function index(Request $request)
    {
        $this->authorize('viewAny', Employee::class);

        $query = Employee::with(['project', 'currency']);

        // Filter by project
        if ($request->filled('project_id')) {
            $query->where('project_id', $request->project_id);
        }

        // Filter by status (active/inactive)
        if ($request->filled('status')) {
            $query->where('status', $request->status);
        }

        // Filter by contract type
        if ($request->filled('contract_type')) {
            $query->where('contract_type', $request->contract_type);
        }

        // Filter by search
        if ($request->filled('search')) {
            $search = $request->search;
            $query->where(function ($q) use ($search) {
                $q->where('first_name', 'like', "%{$search}%")
                  ->orWhere('last_name', 'like', "%{$search}%")
                  ->orWhere('national_code', 'like', "%{$search}%")
                  ->orWhere('position', 'like', "%{$search}%");
            });
        }

        $query->orderBy('first_name')->orderBy('last_name');

        $employees = $query->paginate(16)->appends($request->query());

        $projects = Project::whereIn('status', ['planning', 'active'])->get();
        $contractTypes = ['full_time', 'part_time', 'contractor', 'intern', 'consultant'];

        return view('employees.index', compact('employees', 'projects', 'contractTypes'));
    }

    /**
     * Show the form for creating a new employee.
     */
    public function create()
    {
        $this->authorize('create', Employee::class);

        $employee = null;
        $projects = Project::whereIn('status', ['planning', 'active'])->get();
        $currencies = Currency::where('is_active', true)->get();
        $contractTypes = ['full_time', 'part_time', 'contractor', 'intern', 'consultant'];

        return view('employees.form', compact('employee', 'projects', 'currencies', 'contractTypes'));
    }

    /**
     * Store a newly created employee in storage.
     */
    public function store(StoreEmployeeRequest $request)
    {
        $this->authorize('create', Employee::class);

        $data = $request->validated();
        $data['tenant_id'] = $this->getTenantId();

        // Convert jalali date if needed
        if (!empty($data['hire_date'])) {
            $data['hire_date'] = \App\Helpers\CalendarHelper::parseDate($data['hire_date']);
        }

        $employee = Employee::create($data);

        return redirect()
            ->route('employees.show', $employee)
            ->with('success', __('employee.created_successfully'));
    }

    /**
     * Display the specified employee with work logs and financials.
     */
    public function show(Employee $employee)
    {
        $this->authorize('view', $employee);

        $employee->load([
            'project',
            'currency',
            'workLogs.project',
            'workLogs.task',
            'financials.currency',
        ]);

        return view('employees.show', compact('employee'));
    }

    /**
     * Show the form for editing the specified employee.
     */
    public function edit(Employee $employee)
    {
        $this->authorize('update', $employee);

        $projects = Project::whereIn('status', ['planning', 'active'])->get();
        $currencies = Currency::where('is_active', true)->get();
        $contractTypes = ['full_time', 'part_time', 'contractor', 'intern', 'consultant'];

        return view('employees.form', compact('employee', 'projects', 'currencies', 'contractTypes'));
    }

    /**
     * Update the specified employee in storage.
     */
    public function update(StoreEmployeeRequest $request, Employee $employee)
    {
        $this->authorize('update', $employee);

        $data = $request->validated();

        // Convert jalali date if needed
        if (!empty($data['hire_date'])) {
            $data['hire_date'] = \App\Helpers\CalendarHelper::parseDate($data['hire_date']);
        }

        $employee->update($data);

        return redirect()
            ->route('employees.show', $employee)
            ->with('success', __('employee.updated_successfully'));
    }

    /**
     * Remove the specified employee from storage.
     */
    public function destroy(Employee $employee)
    {
        $this->authorize('delete', $employee);

        $employee->delete();

        return redirect()
            ->route('employees.index')
            ->with('success', __('employee.deleted_successfully'));
    }

    /**
     * Display work logs for the specified employee.
     */
    public function workLogs(Request $request, Employee $employee)
    {
        $this->authorize('view', $employee);

        $query = $employee->workLogs()->with(['project', 'task']);

        if ($request->filled('from_date') && $request->filled('to_date')) {
            $query->dateRange($request->from_date, $request->to_date);
        }

        if ($request->filled('project_id')) {
            $query->where('project_id', $request->project_id);
        }

        $totalHours = (clone $query)->sum('hours_worked');
        $overtimeHours = (clone $query)->overtime()->sum('overtime_hours');
        $workLogs = $query->orderBy('date', 'desc')->paginate(20);

        $projects = Project::whereIn('status', ['planning', 'active'])->get();

        return view('employees.work-logs', compact('employee', 'workLogs', 'totalHours', 'overtimeHours', 'projects'));
    }

    /**
     * Display financial records for the specified employee.
     */
    public function financials(Request $request, Employee $employee)
    {
        $this->authorize('viewFinancials', $employee);

        $query = $employee->financials()->with('currency');

        if ($request->filled('type')) {
            $query->byType($request->type);
        }

        if ($request->filled('is_paid') && $request->is_paid !== '') {
            $query->where('is_paid', $request->boolean('is_paid'));
        }

        $financials = $query->orderBy('effective_date', 'desc')->paginate(20);

        $totalPaid = $employee->financials()->where('is_paid', true)->sum('amount');
        $totalUnpaid = $employee->financials()->where('is_paid', false)->sum('amount');

        $financialTypes = ['salary', 'bonus', 'deduction', 'overtime', 'advance', 'reimbursement'];

        return view('employees.financials', compact('employee', 'financials', 'totalPaid', 'totalUnpaid', 'financialTypes'));
    }
}