<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasOne;
use Illuminate\Database\Eloquent\Relations\HasMany;

class BuildingFunction extends Model
{
    protected $table = 'building_functions';
    protected $fillable = ['code', 'name', 'description', 'parent_id', 'is_active', 'level', 'sort_order'];

    protected $casts = [
        'is_active' => 'boolean',
        'level' => 'integer',
        'sort_order' => 'integer'
    ];

    /**
     * Parent relationship (self-referencing)
     */
    public function parent(): BelongsTo
    {
        return $this->belongsTo(BuildingFunction::class, 'parent_id');
    }

    /**
     * Children relationship (self-referencing)
     */
    public function children(): HasMany
    {
        return $this->hasMany(BuildingFunction::class, 'parent_id')
                    ->where('is_active', true)
                    ->orderBy('sort_order');
    }

    /**
     * Parameters relationship (1:1)
     */
    public function parameters(): HasOne
    {
        return $this->hasOne(BuildingFunctionParameter::class);
    }

    /**
     * Formula relationship (1:1)
     */
    public function formula(): HasOne
    {
        return $this->hasOne(RetributionFormula::class);
    }

    /**
     * Spatial plannings relationship (1:n) - via detected building function
     */
    public function spatialPlannings(): HasMany
    {
        return $this->hasMany(SpatialPlanning::class, 'building_function_id');
    }

    /**
     * Retribution calculations relationship (1:n) - via detected building function
     */
    public function retributionCalculations(): HasMany
    {
        return $this->hasMany(RetributionCalculation::class, 'detected_building_function_id');
    }

    /**
     * Scope: Active building functions only
     */
    public function scopeActive($query)
    {
        return $query->where('is_active', true);
    }

    /**
     * Scope: Parent functions only
     */
    public function scopeParents($query)
    {
        return $query->whereNull('parent_id');
    }

    /**
     * Scope: Children functions only
     */
    public function scopeChildren($query)
    {
        return $query->whereNotNull('parent_id');
    }

    /**
     * Check if building function has complete setup (parameters + formula)
     */
    public function hasCompleteSetup(): bool
    {
        return $this->parameters()->exists() && $this->formula()->exists();
    }

    /**
     * Get building function with all related data
     */
    public function getCompleteData(): array
    {
        return [
            'id' => $this->id,
            'code' => $this->code,
            'name' => $this->name,
            'description' => $this->description,
            'parameters' => $this->parameters?->getParametersArray(),
            'formula' => [
                'name' => $this->formula?->name,
                'expression' => $this->formula?->formula_expression,
                'description' => $this->formula?->description
            ],
            'has_complete_setup' => $this->hasCompleteSetup()
        ];
    }
}