<?php

namespace KTXC\Module;

use JsonSerializable;
use KTXC\Module\Store\ModuleEntry;
use KTXF\Module\ModuleBrowserInterface;
use KTXF\Module\ModuleConsoleInterface;
use KTXF\Module\ModuleInstanceInterface;

/**
 * Module is a unified wrapper that combines both the ModuleInterface instance
 * (from filesystem) and ModuleEntry (from database) into a single object.
 * 
 * This provides a single source of truth for all module information.
 */
class ModuleObject implements JsonSerializable
{
    private ?ModuleInstanceInterface $instance = null;
    private ?ModuleEntry $entry = null;

    public function __construct(?ModuleInstanceInterface $instance = null, ?ModuleEntry $entry = null)
    {
        $this->instance = $instance;
        $this->entry = $entry;
    }

    // ===== Serialization =====
    
    public function jsonSerialize(): array
    {
        return [
            'id' => $this->id(),
            'handle' => $this->handle(),
            'version' => $this->version(),
            'namespace' => $this->namespace(),
            'installed' => $this->installed(),
            'enabled' => $this->enabled(),
            'needsUpgrade' => $this->needsUpgrade(),
        ];
    }

    // ===== State from ModuleEntry (database) =====
    
    public function id(): ?string
    {
        return $this->entry?->getId();
    }
    
    public function installed(): bool
    {
        return $this->entry?->getInstalled() ?? false;
    }

    public function enabled(): bool
    {
        return $this->entry?->getEnabled() ?? false;
    }

    // ===== Information from ModuleInterface (filesystem) =====
    
    public function handle(): string
    {
        if ($this->instance) {
            return $this->instance->handle();
        }
        if ($this->entry) {
            return $this->entry->getHandle();
        }
        throw new \RuntimeException('Module has neither instance nor entry');
    }

    public function namespace(): ?string
    {
        if ($this->entry) {
            return $this->entry->getNamespace();
        }
        if ($this->instance) {
            // Extract namespace from class name
            $className = get_class($this->instance);
            $parts = explode('\\', $className);
            if (count($parts) >= 2 && $parts[0] === 'KTXM') {
                return $parts[1];
            }
        }
        return null;
    }

    public function version(): string
    {
        // Prefer current version from filesystem
        if ($this->instance) {
            return $this->instance->version();
        }
        // Fallback to stored version
        if ($this->entry) {
            return $this->entry->getVersion();
        }
        return '0.0.0';
    }

    public function permissions(): array
    {
        return $this->instance?->permissions() ?? [];
    }

    // ===== Computed properties =====

    public function needsUpgrade(): bool
    {
        if (!$this->instance || !$this->entry || !$this->installed()) {
            return false;
        }
        $currentVersion = $this->instance->version();
        $storedVersion = $this->entry->getVersion();
        return version_compare($currentVersion, $storedVersion, '>');
    }

    // ===== Access to underlying objects =====
    
    public function instance(): ?ModuleInstanceInterface
    {
        return $this->instance;
    }

    public function entry(): ?ModuleEntry
    {
        return $this->entry;
    }

    // ===== Lifecycle methods (delegate to instance) =====
    
    public function boot(): void
    {
        $this->instance?->boot();
    }

    public function install(): void
    {
        $this->instance?->install();
    }

    public function uninstall(): void
    {
        $this->instance?->uninstall();
    }

    public function enable(): void
    {
        $this->instance?->enable();
    }

    public function disable(): void
    {
        $this->instance?->disable();
    }

    public function upgrade(): void
    {
        $this->instance?->upgrade();
    }

    public function registerBI(): array | null
    {
        if ($this->instance instanceof ModuleBrowserInterface) {
            return $this->instance->registerBI();
        }
        return null;
    }

    public function registerCI(): array | null
    {
        if ($this->instance instanceof ModuleConsoleInterface) {
            return $this->instance->registerCI();
        }
        return null;
    }

}