<?php

declare(strict_types=1);

namespace App\Framework\Discovery\ValueObjects;

use App\Framework\Core\ValueObjects\ClassName;

final readonly class DependencyNode
{
    /** @var array<DependencyEdge> */
    private array $dependencies;

    /** @var array<DependencyEdge> */
    private array $dependents;

    public function __construct(
        private ClassName $className,
        private DependencyType $type,
        array $dependencies = [],
        array $dependents = []
    ) {
        $this->dependencies = $dependencies;
        $this->dependents = $dependents;
    }

    /**
     * Create a new dependency node
     */
    public static function create(
        ClassName $className,
        DependencyType $type
    ): self {
        return new self($className, $type);
    }

    /**
     * Get the class name this node represents
     */
    public function getClassName(): ClassName
    {
        return $this->className;
    }

    /**
     * Get the dependency type (service, value object, etc.)
     */
    public function getType(): DependencyType
    {
        return $this->type;
    }

    /**
     * Get all direct dependencies
     *
     * @return array<DependencyEdge>
     */
    public function getDependencies(): array
    {
        return $this->dependencies;
    }

    /**
     * Get all classes that depend on this class
     *
     * @return array<DependencyEdge>
     */
    public function getDependents(): array
    {
        return $this->dependents;
    }

    /**
     * Add a dependency to this node
     */
    public function withDependency(DependencyEdge $dependency): self
    {
        return new self(
            $this->className,
            $this->type,
            [...$this->dependencies, $dependency],
            $this->dependents
        );
    }

    /**
     * Add a dependent to this node
     */
    public function withDependent(DependencyEdge $dependent): self
    {
        return new self(
            $this->className,
            $this->type,
            $this->dependencies,
            [...$this->dependents, $dependent]
        );
    }

    /**
     * Get the dependency count
     */
    public function getDependencyCount(): int
    {
        return count($this->dependencies);
    }

    /**
     * Get the dependent count
     */
    public function getDependentCount(): int
    {
        return count($this->dependents);
    }

    /**
     * Check if this node has circular dependencies
     */
    public function hasCircularDependency(): bool
    {
        foreach ($this->dependencies as $dependency) {
            if ($dependency->getTarget()->equals($this->className)) {
                return true;
            }
        }

        return false;
    }

    /**
     * Get complexity score based on dependency and dependent counts
     */
    public function getComplexityScore(): float
    {
        $dependencyWeight = count($this->dependencies) * 0.7;
        $dependentWeight = count($this->dependents) * 0.3;

        return $dependencyWeight + $dependentWeight;
    }

    /**
     * Check if this is a leaf node (no dependencies)
     */
    public function isLeaf(): bool
    {
        return empty($this->dependencies);
    }

    /**
     * Check if this is a root node (no dependents)
     */
    public function isRoot(): bool
    {
        return empty($this->dependents);
    }

    /**
     * Get dependency names only
     *
     * @return array<string>
     */
    public function getDependencyNames(): array
    {
        return array_map(
            fn (DependencyEdge $edge) => $edge->getTarget()->toString(),
            $this->dependencies
        );
    }

    /**
     * Get dependent names only
     *
     * @return array<string>
     */
    public function getDependentNames(): array
    {
        return array_map(
            fn (DependencyEdge $edge) => $edge->getSource()->toString(),
            $this->dependents
        );
    }

    /**
     * Convert to array for serialization
     *
     * @return array<string, mixed>
     */
    public function toArray(): array
    {
        return [
            'class_name' => $this->className->toString(),
            'type' => $this->type->value,
            'dependency_count' => $this->getDependencyCount(),
            'dependent_count' => $this->getDependentCount(),
            'complexity_score' => $this->getComplexityScore(),
            'is_leaf' => $this->isLeaf(),
            'is_root' => $this->isRoot(),
            'has_circular_dependency' => $this->hasCircularDependency(),
            'dependencies' => array_map(
                fn (DependencyEdge $edge) => $edge->toArray(),
                $this->dependencies
            ),
            'dependents' => array_map(
                fn (DependencyEdge $edge) => $edge->toArray(),
                $this->dependents
            ),
        ];
    }

    /**
     * Convert to string representation
     */
    public function toString(): string
    {
        return sprintf(
            '%s (%s) [deps: %d, dependents: %d, complexity: %.1f]',
            $this->className->getShortName(),
            $this->type->value,
            $this->getDependencyCount(),
            $this->getDependentCount(),
            $this->getComplexityScore()
        );
    }

    public function __toString(): string
    {
        return $this->toString();
    }
}