<?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',
        'level',
        'sort_order',
        'base_tariff'
    ];

    protected $casts = [
        'level' => 'integer',
        'sort_order' => 'integer',
        'base_tariff' => 'decimal:2'
    ];

    /**
     * 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')
                    ->orderBy('sort_order');
    }

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

    /**
     * Formulas relationship (1:n) - multiple formulas for different floor numbers
     */
    public function formulas(): HasMany
    {
        return $this->hasMany(RetributionFormula::class)->orderBy('floor_number');
    }

    /**
     * Get appropriate formula based on floor number
     */
    public function getFormulaForFloor(int $floorNumber): ?RetributionFormula
    {
        return $this->formulas()
            ->where('floor_number', $floorNumber)
            ->first();
    }

    /**
     * Retribution proposals relationship (1:n)
     */
    public function retributionProposals(): HasMany
    {
        return $this->hasMany(RetributionProposal::class, 'building_function_id');
    }

    /**
     * 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');
    }

    /**
     * Scope: By level
     */
    public function scopeByLevel($query, int $level)
    {
        return $query->where('level', $level);
    }

    /**
     * Check if building function has complete setup (parameters + at least one formula)
     */
    public function hasCompleteSetup(): bool
    {
        return $this->parameter()->exists() && $this->formulas()->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,
            'level' => $this->level,
            'sort_order' => $this->sort_order,
            'base_tariff' => $this->base_tariff,
            'parameters' => $this->parameter?->getParametersArray(),
            'formulas' => $this->formulas->map(function ($formula) {
                return [
                    'id' => $formula->id,
                    'name' => $formula->name,
                    'expression' => $formula->formula_expression,
                    'floor_number' => $formula->floor_number,
                    'floor_description' => $this->getFloorDescription($formula->floor_number)
                ];
            })->toArray(),
            'has_complete_setup' => $this->hasCompleteSetup()
        ];
    }

    /**
     * Get floor description
     */
    public function getFloorDescription(?int $floorNumber): string
    {
        if ($floorNumber === null || $floorNumber === 0) {
            return 'Semua lantai';
        }
        
        return "Lantai {$floorNumber}";
    }

    /**
     * Check if this is a parent function
     */
    public function isParent(): bool
    {
        return $this->parent_id === null;
    }

    /**
     * Check if this is a child function
     */
    public function isChild(): bool
    {
        return $this->parent_id !== null;
    }
}