<?php

namespace App\Models;

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

class CashierLedgerEntry extends Model
{
    use HasFactory;

    protected $fillable = [
        'finance_document_id',
        'entry_date',
        'entry_type',
        'payment_method',
        'bank_account',
        'amount',
        'balance_before',
        'balance_after',
        'receipt_number',
        'transaction_reference',
        'recorded_by_cashier_id',
        'recorded_at',
        'notes',
    ];

    protected $casts = [
        'entry_date' => 'date',
        'amount' => 'decimal:2',
        'balance_before' => 'decimal:2',
        'balance_after' => 'decimal:2',
        'recorded_at' => 'datetime',
    ];

    /**
     * 類型常數
     */
    const ENTRY_TYPE_RECEIPT = 'receipt';
    const ENTRY_TYPE_PAYMENT = 'payment';

    const PAYMENT_METHOD_BANK_TRANSFER = 'bank_transfer';
    const PAYMENT_METHOD_CHECK = 'check';
    const PAYMENT_METHOD_CASH = 'cash';

    /**
     * 關聯到報銷申請單
     */
    public function financeDocument(): BelongsTo
    {
        return $this->belongsTo(FinanceDocument::class);
    }

    /**
     * 記錄的出納人員
     */
    public function recordedByCashier(): BelongsTo
    {
        return $this->belongsTo(User::class, 'recorded_by_cashier_id');
    }

    /**
     * 計算交易後餘額
     */
    public function calculateBalanceAfter(float $currentBalance): float
    {
        if ($this->entry_type === self::ENTRY_TYPE_RECEIPT) {
            return $currentBalance + $this->amount;
        } else {
            return $currentBalance - $this->amount;
        }
    }

    /**
     * 取得最新餘額（從最後一筆記錄）
     */
    public static function getLatestBalance(string $bankAccount = null): float
    {
        $query = self::orderBy('entry_date', 'desc')
            ->orderBy('id', 'desc');

        if ($bankAccount) {
            $query->where('bank_account', $bankAccount);
        }

        $latest = $query->first();

        return $latest ? $latest->balance_after : 0.00;
    }

    /**
     * 取得類型文字
     */
    public function getEntryTypeText(): string
    {
        return match ($this->entry_type) {
            self::ENTRY_TYPE_RECEIPT => '收入',
            self::ENTRY_TYPE_PAYMENT => '支出',
            default => '未知',
        };
    }

    /**
     * 取得付款方式文字
     */
    public function getPaymentMethodText(): string
    {
        return match ($this->payment_method) {
            self::PAYMENT_METHOD_BANK_TRANSFER => '銀行轉帳',
            self::PAYMENT_METHOD_CHECK => '支票',
            self::PAYMENT_METHOD_CASH => '現金',
            default => '未知',
        };
    }

    /**
     * 是否為收入記錄
     */
    public function isReceipt(): bool
    {
        return $this->entry_type === self::ENTRY_TYPE_RECEIPT;
    }

    /**
     * 是否為支出記錄
     */
    public function isPayment(): bool
    {
        return $this->entry_type === self::ENTRY_TYPE_PAYMENT;
    }
}