<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;

class ChartOfAccount extends Model
{
    use HasFactory;

    public const TYPE_INCOME = 'income';
    public const TYPE_EXPENSE = 'expense';
    public const TYPE_ASSET = 'asset';
    public const TYPE_LIABILITY = 'liability';
    public const TYPE_NET_ASSET = 'net_asset';

    protected $fillable = [
        'account_code',
        'account_name_zh',
        'account_name_en',
        'account_type',
        'category',
        'parent_account_id',
        'is_active',
        'display_order',
        'description',
    ];

    protected $casts = [
        'is_active' => 'boolean',
        'display_order' => 'integer',
    ];

    // Relationships

    public function parentAccount(): BelongsTo
    {
        return $this->belongsTo(ChartOfAccount::class, 'parent_account_id');
    }

    public function childAccounts(): HasMany
    {
        return $this->hasMany(ChartOfAccount::class, 'parent_account_id')->orderBy('display_order');
    }

    public function budgetItems(): HasMany
    {
        return $this->hasMany(BudgetItem::class);
    }

    public function transactions(): HasMany
    {
        return $this->hasMany(Transaction::class);
    }

    // Helper methods

    public function getFullNameAttribute(): string
    {
        return "{$this->account_code} - {$this->account_name_zh}";
    }

    public function isIncome(): bool
    {
        return $this->account_type === 'income';
    }

    public function isExpense(): bool
    {
        return $this->account_type === 'expense';
    }

    public function isAsset(): bool
    {
        return $this->account_type === 'asset';
    }

    public function isLiability(): bool
    {
        return $this->account_type === 'liability';
    }

    public function isNetAsset(): bool
    {
        return $this->account_type === 'net_asset';
    }
}