<?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 Budget extends Model
{
    use HasFactory;

    public const STATUS_DRAFT = 'draft';
    public const STATUS_SUBMITTED = 'submitted';
    public const STATUS_APPROVED = 'approved';
    public const STATUS_ACTIVE = 'active';
    public const STATUS_CLOSED = 'closed';

    protected $fillable = [
        'fiscal_year',
        'name',
        'period_type',
        'period_start',
        'period_end',
        'status',
        'created_by_user_id',
        'approved_by_user_id',
        'approved_at',
        'notes',
    ];

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

    // Relationships

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

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

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

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

    // Helper methods

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

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

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

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

    public function canBeEdited(): bool
    {
        return in_array($this->status, [self::STATUS_DRAFT, self::STATUS_SUBMITTED]);
    }

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

    public function getTotalBudgetedIncomeAttribute(): float
    {
        return $this->budgetItems()
            ->whereHas('chartOfAccount', fn($q) => $q->where('account_type', 'income'))
            ->sum('budgeted_amount');
    }

    public function getTotalBudgetedExpenseAttribute(): float
    {
        return $this->budgetItems()
            ->whereHas('chartOfAccount', fn($q) => $q->where('account_type', 'expense'))
            ->sum('budgeted_amount');
    }

    public function getTotalActualIncomeAttribute(): float
    {
        return $this->budgetItems()
            ->whereHas('chartOfAccount', fn($q) => $q->where('account_type', 'income'))
            ->sum('actual_amount');
    }

    public function getTotalActualExpenseAttribute(): float
    {
        return $this->budgetItems()
            ->whereHas('chartOfAccount', fn($q) => $q->where('account_type', 'expense'))
            ->sum('actual_amount');
    }
}