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<?php
namespace Consolidation\SiteAlias;

use Consolidation\Config\Config;
use Consolidation\Config\ConfigInterface;
use Consolidation\Config\Util\ConfigRuntimeInterface;
use Consolidation\SiteAlias\SiteAlias;
use Consolidation\SiteAlias\SiteAliasInterface;
use Consolidation\SiteAlias\SiteAliasTrait;

/**
 * SiteAliasWithConfig delegates to a site alias, and
 * also combines it with two config stores:
 *
 *   - Runtime config (set on commandline): Options that override site alias contents
 *   - Default config (set from config files): Default options
 */
class SiteAliasWithConfig implements SiteAliasInterface, ConfigRuntimeInterface
{
    use SiteAliasTrait;

    protected $runtimeConfig;
    protected $siteAlias;
    protected $defaultConfig;

    public function __construct(SiteAliasInterface $siteAlias, ConfigInterface $defaultConfig, ConfigInterface $runtimeConfig)
    {
        $this->siteAlias = $siteAlias;
        $this->defaultConfig = $defaultConfig;
        $this->runtimeConfig = $runtimeConfig;
    }

    /**
     * combine the provided site alias with configuration.
     *
     * @return SiteAlias read-only site alias combined with the runtime
     *   config (overrides the site alias values) and the default config.
     */
    public static function create(SiteAliasInterface $siteAlias, ConfigInterface $defaultConfig, ConfigInterface $runtimeConfig = null)
    {
        $runtimeConfig = static::determineCorrectRuntimeConfig($defaultConfig, $runtimeConfig);

        return new self($siteAlias, $defaultConfig, $runtimeConfig);
    }

    /**
     * Determine what object to use for the runtime config. If a specific
     * runtime config is given, use that. Otherwise, pull it from the default
     * configuration if available.
     */
    protected static function determineCorrectRuntimeConfig(ConfigInterface $defaultConfig, ConfigInterface $runtimeConfig)
    {
        if ($runtimeConfig) {
            return $runtimeConfig;
        }

        if ($defaultConfig instanceof ConfigRuntimeInterface) {
            return $defaultConfig->runtimeConfig();
        }

        return new Config();
    }

    /**
     * @inheritdoc
     */
    public function runtimeConfig()
    {
        return $this->runtimeConfig;
    }

    /**
     * @inheritdoc
     */
    public function name()
    {
        return $this->siteAlias->name();
    }

    /**
     * @inheritdoc
     */
    public function has($key)
    {
        return
            $this->runtimeConfig->has($key) ||
            $this->siteAlias->has($key) ||
            $this->defaultConfig->has($key);
    }

    /**
     * @inheritdoc
     */
    public function get($key, $defaultFallback = null)
    {
        if ($this->runtimeConfig->has($key)) {
            return $this->runtimeConfig->get($key);
        }
        if ($this->siteAlias->has($key)) {
            return $this->siteAlias->get($key);
        }
        if ($this->defaultConfig->has($key)) {
            return $this->defaultConfig->get($key);
        }

        return $defaultFallback;
    }

    /**
     * @inheritdoc
     */
    public function set($key, $value)
    {
        $this->changesProhibited();
    }

    /**
     * @inheritdoc
     */
    public function import($data)
    {
        $this->changesProhibited();
    }

    /**
     * @inheritdoc
     */
    public function replace($data)
    {
        $this->changesProhibited();
    }

    /**
     * @inheritdoc
     */
    public function combine($data)
    {
        $this->changesProhibited();
    }

    /**
     * Export all configuration as a nested array.
     */
    public function export()
    {
        throw new \Exception('SiteAliasWithConfig::export() not supported.');
    }

    /**
     * @inheritdoc
     */
    public function hasDefault($key)
    {
        return false;
    }

    /**
     * @inheritdoc
     */
    public function getDefault($key, $defaultFallback = null)
    {
        return $defaultFallback;
    }

    /**
     * @inheritdoc
     */
    public function setDefault($key, $value)
    {
        $this->changesProhibited();
    }

    /**
     * @inheritdoc
     */
    public function exportConfig()
    {
        throw new \Exception('SiteAliasWithConfig::exportConfig() not supported.');
    }

    protected function changesProhibited()
    {
        throw new \Exception('Changing a SiteAliasWithConfig is not permitted.');
    }
}