<?php

namespace Database\Seeders;

use Illuminate\Database\Seeder;
use App\Models\User;
use App\Models\Employee;
use App\Models\Shift;
use App\Models\AttendanceRecord;
use Illuminate\Support\Facades\File;
use Carbon\Carbon;

class PropagateRosterSeeder extends Seeder
{
    public function run()
    {
        $jsonPath = database_path('data/employee_patterns.json');
        
        if (!File::exists($jsonPath)) {
            $this->command->error("Patterns file not found.");
            return;
        }

        $patterns = json_decode(File::get($jsonPath), true);
        
        // Months to seed: April and May 2026
        $months = [
            ['year' => 2026, 'month' => 4],
            ['year' => 2026, 'month' => 5],
        ];
        
        $employees = Employee::all();
        $total = $employees->count();
        
        foreach ($months as $m) {
            $startDate = Carbon::create($m['year'], $m['month'], 1);
            $endDate = $startDate->copy()->endOfMonth();

            $this->command->info("Propagating patterns into " . $startDate->format('F Y') . "...");
            $this->command->getOutput()->progressStart($total);

            foreach ($employees as $emp) {
                $pattern = $patterns[$emp->employee_id] ?? null;
                
                if (!$pattern) {
                    $this->command->getOutput()->progressAdvance();
                    continue;
                }

                $current = $startDate->copy();
                while ($current->lte($endDate)) {
                    $pyDow = $current->dayOfWeekIso - 1; // 0=Mon, 6=Sun
                    $assignment = $pattern[$pyDow] ?? null;

                    if ($assignment) {
                        $shift = null;
                        if ($assignment['shift']) {
                            $shift = Shift::where('name', $assignment['shift'])->first();
                        }

                        AttendanceRecord::updateOrCreate(
                            [
                                'employee_id' => $emp->user_id,
                                'date' => $current->toDateString()
                            ],
                            [
                                'shift_id' => $shift ? $shift->id : null,
                                'is_rest_day' => $assignment['is_rd'],
                                'status' => $assignment['is_rd'] ? 'rest_day' : 'absent',
                                'created_by' => 1
                            ]
                        );
                    }
                    $current->addDay();
                }
                
                $this->command->getOutput()->progressAdvance();
            }

            $this->command->getOutput()->progressFinish();
        }

        $this->command->info("Propagated roster for April and May 2026 successfully.");
    }
}