<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Facades\Storage;

class MembershipPayment extends Model
{
    use HasFactory;

    // Status constants
    const STATUS_PENDING = 'pending';
    const STATUS_APPROVED_CASHIER = 'approved_cashier';
    const STATUS_APPROVED_ACCOUNTANT = 'approved_accountant';
    const STATUS_APPROVED_CHAIR = 'approved_chair';
    const STATUS_REJECTED = 'rejected';

    // Payment method constants
    const METHOD_BANK_TRANSFER = 'bank_transfer';
    const METHOD_CONVENIENCE_STORE = 'convenience_store';
    const METHOD_CASH = 'cash';
    const METHOD_CREDIT_CARD = 'credit_card';

    // Fee type constants
    const FEE_TYPE_ENTRANCE = 'entrance_fee';   // 入會會費
    const FEE_TYPE_ANNUAL = 'annual_fee';       // 常年會費

    protected $fillable = [
        'member_id',
        'fee_type',
        'paid_at',
        'amount',
        'base_amount',
        'discount_amount',
        'final_amount',
        'disability_discount',
        'method',
        'reference',
        'status',
        'payment_method',
        'receipt_path',
        'submitted_by_user_id',
        'verified_by_cashier_id',
        'cashier_verified_at',
        'verified_by_accountant_id',
        'accountant_verified_at',
        'verified_by_chair_id',
        'chair_verified_at',
        'rejected_by_user_id',
        'rejected_at',
        'rejection_reason',
        'notes',
    ];

    protected $casts = [
        'paid_at' => 'date',
        'cashier_verified_at' => 'datetime',
        'accountant_verified_at' => 'datetime',
        'chair_verified_at' => 'datetime',
        'rejected_at' => 'datetime',
        'base_amount' => 'decimal:2',
        'discount_amount' => 'decimal:2',
        'final_amount' => 'decimal:2',
        'disability_discount' => 'boolean',
    ];

    // Relationships
    public function member()
    {
        return $this->belongsTo(Member::class);
    }

    public function submittedBy()
    {
        return $this->belongsTo(User::class, 'submitted_by_user_id');
    }

    public function verifiedByCashier()
    {
        return $this->belongsTo(User::class, 'verified_by_cashier_id');
    }

    public function verifiedByAccountant()
    {
        return $this->belongsTo(User::class, 'verified_by_accountant_id');
    }

    public function verifiedByChair()
    {
        return $this->belongsTo(User::class, 'verified_by_chair_id');
    }

    public function rejectedBy()
    {
        return $this->belongsTo(User::class, 'rejected_by_user_id');
    }

    // Status check methods
    public function isPending(): bool
    {
        return $this->status === self::STATUS_PENDING;
    }

    public function isApprovedByCashier(): bool
    {
        return $this->status === self::STATUS_APPROVED_CASHIER;
    }

    public function isApprovedByAccountant(): bool
    {
        return $this->status === self::STATUS_APPROVED_ACCOUNTANT;
    }

    public function isFullyApproved(): bool
    {
        return $this->status === self::STATUS_APPROVED_CHAIR;
    }

    public function isRejected(): bool
    {
        return $this->status === self::STATUS_REJECTED;
    }

    // Workflow validation methods
    public function canBeApprovedByCashier(): bool
    {
        return $this->isPending();
    }

    public function canBeApprovedByAccountant(): bool
    {
        return $this->isApprovedByCashier();
    }

    public function canBeApprovedByChair(): bool
    {
        return $this->isApprovedByAccountant();
    }

    // Accessor for status label
    public function getStatusLabelAttribute(): string
    {
        return match($this->status) {
            self::STATUS_PENDING => '待審核',
            self::STATUS_APPROVED_CASHIER => '出納已審',
            self::STATUS_APPROVED_ACCOUNTANT => '會計已審',
            self::STATUS_APPROVED_CHAIR => '主席已審',
            self::STATUS_REJECTED => '已拒絕',
            default => $this->status,
        };
    }

    // Accessor for payment method label
    public function getPaymentMethodLabelAttribute(): string
    {
        return match($this->payment_method) {
            self::METHOD_BANK_TRANSFER => '銀行轉帳',
            self::METHOD_CONVENIENCE_STORE => '超商繳費',
            self::METHOD_CASH => '現金',
            self::METHOD_CREDIT_CARD => '信用卡',
            default => $this->payment_method ?? '未指定',
        };
    }

    // Accessor for fee type label
    public function getFeeTypeLabelAttribute(): string
    {
        return match($this->fee_type) {
            self::FEE_TYPE_ENTRANCE => '入會會費',
            self::FEE_TYPE_ANNUAL => '常年會費',
            default => $this->fee_type ?? '未指定',
        };
    }

    /**
     * 是否有使用身心障礙優惠
     */
    public function hasDisabilityDiscount(): bool
    {
        return (bool) $this->disability_discount;
    }

    /**
     * 取得折扣說明
     */
    public function getDiscountDescriptionAttribute(): ?string
    {
        if (!$this->hasDisabilityDiscount()) {
            return null;
        }

        return '身心障礙優惠 50%';
    }

    // Clean up receipt file when payment is deleted
    protected static function boot()
    {
        parent::boot();

        static::deleting(function ($payment) {
            if ($payment->receipt_path && Storage::disk('private')->exists($payment->receipt_path)) {
                Storage::disk('private')->delete($payment->receipt_path);
            }
        });
    }
}