<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;

class UserBudget extends Model
{
    protected $fillable = [
        'user_id',
        'monthly_limit',
        'daily_limit',
        'current_month_spending',
        'current_day_spending',
        'month_started_at',
        'day_started_at',
        'alert_threshold_percentage',
        'last_alert_sent_at',
        'is_budget_exceeded',
        'is_active',
    ];

    protected $casts = [
        'monthly_limit' => 'decimal:2',
        'daily_limit' => 'decimal:2',
        'current_month_spending' => 'decimal:2',
        'current_day_spending' => 'decimal:2',
        'month_started_at' => 'date',
        'day_started_at' => 'date',
        'alert_threshold_percentage' => 'integer',
        'last_alert_sent_at' => 'datetime',
        'is_budget_exceeded' => 'boolean',
        'is_active' => 'boolean',
    ];

    public function user(): BelongsTo
    {
        return $this->belongsTo(User::class);
    }

    public function getRemainingMonthlyBudget(): float
    {
        return max(0, $this->monthly_limit - $this->current_month_spending);
    }

    public function getRemainingDailyBudget(): ?float
    {
        if (!$this->daily_limit) {
            return null;
        }
        return max(0, $this->daily_limit - $this->current_day_spending);
    }

    public function getMonthlyUsagePercentage(): float
    {
        if ($this->monthly_limit == 0) {
            return 0;
        }
        return ($this->current_month_spending / $this->monthly_limit) * 100;
    }

    public function shouldSendAlert(): bool
    {
        $percentage = $this->getMonthlyUsagePercentage();
        return $percentage >= $this->alert_threshold_percentage 
            && (!$this->last_alert_sent_at || $this->last_alert_sent_at->lt(now()->subHours(24)));
    }
}