<?php

namespace Phabel\Composer\Repository;

use Composer\Package\AliasPackage;
use Composer\Package\Link;
use Composer\Package\Package;
use Composer\Package\PackageInterface;
use Composer\Repository\PlatformRepository;
use Composer\Repository\RepositoryInterface;
use Composer\Semver\Constraint\Constraint as ConstraintConstraint;
use Composer\Semver\Constraint\ConstraintInterface;
use Composer\Semver\Constraint\MultiConstraint as ConstraintMultiConstraint;
use Phabel\Composer\Constraint\Constraint;
use Phabel\Composer\Constraint\MultiConstraint;
use ReflectionObject;

/**
 * @author Daniil Gentili <daniil@daniil.it>
 * @license MIT
 */
trait Repository
{
    /**
     * Previous repository .
     */
    protected RepositoryInterface $repository;
    /**
     * Reflection object.
     */
    protected ReflectionObject $reflect;
    /**
     * Constructor.
     *
     * @param RepositoryInterface $repository Previous repository
     */
    public function __construct(RepositoryInterface $repository)
    {
        $this->reflect = new ReflectionObject($repository);
        $this->repository = $repository;
        $this->packages = [];
    }
    /**
     * Checks if specified package registered (installed).
     *
     * @param PackageInterface $package package instance
     *
     * @return bool
     */
    public function hasPackage(PackageInterface $package): bool
    {
        return $this->repository->hasPackage($package);
    }

    /**
     * Look for phabel configuration parameters in constraint.
     *
     * @param string|\Composer\Semver\Constraint\ConstraintInterface|null &$constraint package version or version constraint to match against
     *
     * @return array
     */
    private static function prepareConstraint(&$constraint): array
    {
        if ($constraint instanceof Constraint || $constraint instanceof MultiConstraint) {
            $config = $constraint->getConfig();
            $constraint = $constraint->getPrevious();
            return $config;
        }
        /*
        if (!$constraint instanceof ConstraintInterface && !\is_string($constraint)) {
            return [];
        }
        $constraint = (string) $constraint;
        if (!str_starts_with($constraint, ComposerRepository::CONFIG_PREFIX)) {
            return [];
        }
        [$config, $constraint] = \explode("\0", $constraint, 2);
        return \json_decode(\substr($config, 0, \strlen(ComposerRepository::CONFIG_PREFIX)), true) ?: [];*/
    }
    /**
     * Prepare package.
     *
     * @param PackageInterface $package Package
     * @param array            $config  Configuration inherited from constraint
     *
     * @return void
     */
    private static function preparePackage(PackageInterface $package, array $config): void
    {
        /**
         * Phabel configuration of current package.
         * @var array
         */
        $myConfig = $package->getExtra()['phabel'] ?? [];
        $havePhabel = false;
        foreach ($package->getRequires() as $link) {
            if ($link->getTarget() === 'phabel/phabel') {
                $havePhabel = true;
            }
            if ($link->getTarget() === 'php') {
                $myConfig['target'] = $link->getConstraint();
                if ($havePhabel) {
                    break;
                }
            }
        }
        if (!$havePhabel) {
            //return;
        }
        // Config merging logic here...
        $links = [];
        foreach ($package->getRequires() as $link) {
            if (PlatformRepository::isPlatformPackage($link->getTarget())) {
                continue;
            }
            //var_dumP($link->getTarget(), (string) $link->getConstraint());
            //$version = ComposerRepository::CONFIG_PREFIX.\json_encode($config)."\0".($link->getConstraint() ?? '');
            $constraint = $link->getConstraint();
            if ($constraint instanceof ConstraintMultiConstraint) {
                $constraint = new MultiConstraint($constraint, $config);
            } else {
                $constraint = new Constraint($constraint, $config);
            }
            $links []= new Link($link->getSource(), $link->getTarget(), $constraint, $link->getDescription());
        }
        if ($package instanceof Package) {
            $package->setRequires($links);
        } elseif ($package instanceof AliasPackage) {
            while (($p = $package->getAliasOf()) instanceof AliasPackage);
            $p->setRequires($links);
        }
    }

    /**
     * Searches for the first match of a package by name and version.
     *
     * @param string                                                 $name       package name
     * @param string|\Composer\Semver\Constraint\ConstraintInterface $constraint package version or version constraint to match against
     *
     * @return PackageInterface|null
     */
    public function findPackage($name, $constraint)
    {
        $config = self::prepareConstraint($constraint);
        if (!$package = $this->repository->findPackage($name, $constraint)) {
            return null;
        }
        return self::preparePackage($package, $config);
    }

    /**
     * Searches for all packages matching a name and optionally a version.
     *
     * @param string                                                 $name       package name
     * @param string|\Composer\Semver\Constraint\ConstraintInterface $constraint package version or version constraint to match against
     *
     * @return PackageInterface[]
     */
    public function findPackages($name, $constraint = null)
    {
        $config = self::prepareConstraint($constraint);
        foreach ($packages = $this->repository->findPackages($name, $constraint) as $package) {
            self::preparePackage($package, $config);
        }
        return $packages;
    }

    /**
     * Returns list of registered packages.
     *
     * @return PackageInterface[]
     */
    public function getPackages()
    {
        $packages = $this->repository->getPackages();
        foreach ($packages as $package) {
            self::preparePackage($package, []);
        }
        return $packages;
    }

    /**
     * {@inheritDoc}
     */
    public function search($query, $mode = 0, $type = null)
    {
        return $this->repository->search($query, $mode, $type);
    }

    public function getRepoName()
    {
        return $this->repository->getRepoName();
    }
}