<?php

namespace Modules\ProjectManagement\Models;

use App\Traits\HasPublicIdentifier;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Modules\MasterData\Models\Material;

class TaskMaterial extends Model
{
    use HasPublicIdentifier;

    protected $fillable = [
        'task_id',
        'material_id',
        'planned_qty',
        'actual_qty',
        'unit_cost',
        'notes',
    ];

    protected function casts(): array
    {
        return [
            'planned_qty' => 'decimal:2',
            'actual_qty' => 'decimal:2',
            'unit_cost' => 'decimal:2',
        ];
    }

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

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

    protected static function booted(): void
    {
        static::created(function (TaskMaterial $tm) {
            if (auth()->check() && $tm->task) {
                $tm->task->activities()->create([
                    'user_id' => auth()->id(),
                    'description' => "added material '{$tm->material?->name}' (Planned Qty: {$tm->planned_qty}).",
                    'type' => 'material_add',
                ]);
            }
        });

        static::updated(function (TaskMaterial $tm) {
            if (auth()->check() && $tm->task) {
                $dirty = $tm->getDirty();
                $changes = [];
                if (array_key_exists('actual_qty', $dirty)) {
                    $changes[] = "updated actual quantity for '{$tm->material?->name}' to {$tm->actual_qty}";
                }
                if (array_key_exists('planned_qty', $dirty)) {
                    $changes[] = "updated planned quantity for '{$tm->material?->name}' to {$tm->planned_qty}";
                }
                if (!empty($changes)) {
                    $tm->task->activities()->create([
                        'user_id' => auth()->id(),
                        'description' => implode(', ', $changes) . '.',
                        'type' => 'material_update',
                    ]);
                }
            }
        });

        static::deleted(function (TaskMaterial $tm) {
            if (auth()->check() && $tm->task) {
                $tm->task->activities()->create([
                    'user_id' => auth()->id(),
                    'description' => "removed material '{$tm->material?->name}'.",
                    'type' => 'material_remove',
                ]);
            }
        });
    }


    public function getPlannedCostAttribute(): float
    {
        return (float) $this->planned_qty * (float) $this->unit_cost;
    }

    public function getActualCostAttribute(): float
    {
        return (float) $this->actual_qty * (float) $this->unit_cost;
    }

    public function getEffectiveCostAttribute(): float
    {
        return $this->actual_qty > 0 ? $this->actual_cost : $this->planned_cost;
    }

    public function getVarianceAttribute(): float
    {
        return $this->planned_cost - $this->actual_cost;
    }
}