<?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\ProjectManagement\Models\Project;

class MaterialRequisition extends Model
{
    use HasPublicIdentifier, HasApprovable;

    protected $fillable = [
        'project_id', 'document_number', 'requisition_type', 'status',
        'needed_by_date', 'purpose',
        'requested_by', 'approved_by', 'approved_at', 'notes',
    ];

    protected function casts(): array
    {
        return [
            'needed_by_date' => 'date',
            'approved_at' => 'datetime',
        ];
    }

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


    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(MaterialRequisitionItem::class);
    }

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

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

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

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

    public function onApprovalCompleted($chain): void
    {
        $statusValue = is_string($chain->status) ? $chain->status : ($chain->status->value ?? 'approved');
        $this->update(['status' => $statusValue]);

        if ($statusValue === '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(),
            ]);
        }
    }
}