<?php

namespace Modules\MaterialLogistics\Models;

use App\Models\User;
use App\Traits\HasPublicIdentifier;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\BelongsToMany;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Modules\ApprovalWorkflow\Traits\HasApprovable;
use Modules\MaterialLogistics\Enums\PaymentStatus;
use Modules\ProjectManagement\Models\Project;

class PurchaseOrder extends Model
{
    use HasPublicIdentifier, HasApprovable;

    protected $fillable = [
        'document_number', 'supplier', 'status', 'target_warehouse_id',
        'payment_status', 'paid_at', 'receipt_path', 'receipt_original_name',
        'requested_by', 'approved_by', 'approved_at', 'notes',
    ];

    protected function casts(): array
    {
        return [
            'payment_status' => PaymentStatus::class,
            'approved_at' => 'datetime',
            'paid_at' => 'datetime',
        ];
    }

    public function isPaid(): bool
    {
        return $this->payment_status === PaymentStatus::Paid;
    }

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

    public function hasReceipt(): bool
    {
        return !empty($this->receipt_path);
    }


    public function targetWarehouse(): BelongsTo
    {
        return $this->belongsTo(Warehouse::class, 'target_warehouse_id');
    }

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

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

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

    public function requisitions(): BelongsToMany
    {
        return $this->belongsToMany(MaterialRequisition::class, 'purchase_order_requisitions')
            ->withTimestamps();
    }

    public function getTotalCostAttribute(): float
    {
        return $this->items->sum(fn (PurchaseOrderItem $item) => $item->line_total);
    }

    public function scopeApproved($query)
    {
        return $query->where('status', 'approved');
    }

    public function onApprovalCompleted($chain)
    {
        $this->update(['status' => $chain->status->value]);
        
        if ($chain->status->value === 'approved') {
            $lastStep = $chain->steps()->where('status', 'approved')->orderByDesc('acted_at')->first();
            $this->update([
                'approved_by' => $lastStep ? $lastStep->approver_id : null,
                'approved_at' => $lastStep ? $lastStep->acted_at : now(),
            ]);
        } elseif ($chain->status->value === 'rejected') {
            $this->requisitions()->detach();
        }
    }
}