<?php

namespace App\Models;

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

class FinancialReport extends Model
{
    use HasFactory;

    public const TYPE_REVENUE_EXPENDITURE = 'revenue_expenditure';
    public const TYPE_BALANCE_SHEET = 'balance_sheet';
    public const TYPE_PROPERTY_INVENTORY = 'property_inventory';
    public const TYPE_INTERNAL_MANAGEMENT = 'internal_management';

    public const STATUS_DRAFT = 'draft';
    public const STATUS_FINALIZED = 'finalized';
    public const STATUS_APPROVED = 'approved';
    public const STATUS_SUBMITTED = 'submitted';

    protected $fillable = [
        'report_type',
        'fiscal_year',
        'period_start',
        'period_end',
        'status',
        'budget_id',
        'generated_by_user_id',
        'approved_by_user_id',
        'approved_at',
        'file_path',
        'notes',
    ];

    protected $casts = [
        'fiscal_year' => 'integer',
        'period_start' => 'date',
        'period_end' => 'date',
        'approved_at' => 'datetime',
    ];

    // Relationships

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

    public function generatedBy(): BelongsTo
    {
        return $this->belongsTo(User::class, 'generated_by_user_id');
    }

    public function approvedBy(): BelongsTo
    {
        return $this->belongsTo(User::class, 'approved_by_user_id');
    }

    // Helper methods

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

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

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

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

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

    public function getReportTypeNameAttribute(): string
    {
        return match($this->report_type) {
            self::TYPE_REVENUE_EXPENDITURE => '收支決算表',
            self::TYPE_BALANCE_SHEET => '資產負債表',
            self::TYPE_PROPERTY_INVENTORY => '財產目錄',
            self::TYPE_INTERNAL_MANAGEMENT => '內部管理報表',
            default => $this->report_type,
        };
    }
}