<?php

namespace Pterodactyl\BlueprintFramework\Extensions\modpackchecker\Controllers;

use Pterodactyl\Http\Controllers\Controller;
use Pterodactyl\Models\Server;
use Pterodactyl\Repositories\Wings\DaemonFileRepository;
use Pterodactyl\BlueprintFramework\Libraries\ExtensionLibrary\Admin\BlueprintAdminLibrary as BlueprintExtensionLibrary;
use Illuminate\Http\Request;
use Illuminate\Http\JsonResponse;
use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\DB;

class ModpackAPIController extends Controller
{
    public function __construct(
        private DaemonFileRepository $fileRepository,
        private BlueprintExtensionLibrary $blueprint
    ) {}

    /**
     * Manual version check triggered from React frontend
     */
    public function manualCheck(Request $request, Server $server): JsonResponse
    {
        // 1. Try Egg Variables first (most reliable)
        $platform = $this->getEggVariable($server, 'MODPACK_PLATFORM');
        $modpackId = $this->getEggVariable($server, 'MODPACK_ID');

        // Also check platform-specific variables
        if (empty($modpackId)) {
            $modpackId = match($platform) {
                'curseforge' => $this->getEggVariable($server, 'CURSEFORGE_ID'),
                'modrinth' => $this->getEggVariable($server, 'MODRINTH_PROJECT_ID'),
                'ftb' => $this->getEggVariable($server, 'FTB_MODPACK_ID'),
                'technic' => $this->getEggVariable($server, 'TECHNIC_SLUG'),
                default => null
            };
        }

        // 2. If no egg variables, try file detection
        if (empty($platform) || empty($modpackId)) {
            $detected = $this->detectFromFiles($server);
            $platform = $platform ?: ($detected['platform'] ?? null);
            $modpackId = $modpackId ?: ($detected['modpack_id'] ?? null);
        }

        // 3. If still nothing, return helpful error
        if (empty($platform) || empty($modpackId)) {
            return response()->json([
                'success' => false,
                'message' => 'Could not detect modpack. Set MODPACK_PLATFORM and MODPACK_ID in startup variables.',
            ]);
        }

        // 4. Check the appropriate API
        try {
            $versionData = match($platform) {
                'curseforge' => $this->checkCurseForge($modpackId),
                'modrinth' => $this->checkModrinth($modpackId),
                'ftb' => $this->checkFTB($modpackId),
                'technic' => $this->checkTechnic($modpackId),
                default => throw new \Exception("Unknown platform: {$platform}")
            };

            return response()->json([
                'success' => true,
                'platform' => $platform,
                'modpack_id' => $modpackId,
                'modpack_name' => $versionData['name'] ?? 'Unknown',
                'latest_version' => $versionData['version'] ?? 'Unknown',
                'status' => 'checked',
            ]);
        } catch (\Exception $e) {
            return response()->json([
                'success' => false,
                'platform' => $platform,
                'modpack_id' => $modpackId,
                'error' => $e->getMessage(),
            ]);
        }
    }

    /**
     * Get an egg variable value for a server
     */
    private function getEggVariable(Server $server, string $name): ?string
    {
        $variable = $server->variables()
            ->where('env_variable', $name)
            ->first();
        return $variable?->server_value;
    }

    /**
     * Attempt to detect modpack from files
     */
    private function detectFromFiles(Server $server): array
    {
        try {
            // Try CurseForge manifest.json
            $manifest = $this->readServerFile($server, 'manifest.json');
            if ($manifest) {
                $data = json_decode($manifest, true);
                if (isset($data['manifestType']) && $data['manifestType'] === 'minecraftModpack') {
                    return [
                        'platform' => 'curseforge',
                        'modpack_id' => $data['projectID'] ?? null,
                        'name' => $data['name'] ?? null,
                        'version' => $data['version'] ?? null,
                    ];
                }
            }

            // Try Modrinth modrinth.index.json
            $modrinthIndex = $this->readServerFile($server, 'modrinth.index.json');
            if ($modrinthIndex) {
                $data = json_decode($modrinthIndex, true);
                if (isset($data['formatVersion'])) {
                    return [
                        'platform' => 'modrinth',
                        'modpack_id' => $data['dependencies']['minecraft'] ?? null,
                        'name' => $data['name'] ?? null,
                        'version' => $data['versionId'] ?? null,
                    ];
                }
            }
        } catch (\Exception $e) {
            // File detection failed, return empty
        }

        return [];
    }

    /**
     * Read a file from the server via Wings
     */
    private function readServerFile(Server $server, string $path): ?string
    {
        try {
            $this->fileRepository->setServer($server);
            return $this->fileRepository->getContent($path);
        } catch (\Exception $e) {
            return null;
        }
    }

    /**
     * Check CurseForge API for latest version
     */
    private function checkCurseForge(string $modpackId): array
    {
        $apiKey = $this->blueprint->dbGet('modpackchecker', 'curseforge_api_key');
        
        if (empty($apiKey)) {
            throw new \Exception('CurseForge API key not configured');
        }

        $response = Http::withHeaders([
            'x-api-key' => $apiKey,
            'Accept' => 'application/json',
        ])->get("https://api.curseforge.com/v1/mods/{$modpackId}");

        if (!$response->successful()) {
            throw new \Exception('CurseForge API request failed: ' . $response->status());
        }

        $data = $response->json();
        $mod = $data['data'] ?? [];

        return [
            'name' => $mod['name'] ?? 'Unknown',
            'version' => $mod['latestFiles'][0]['displayName'] ?? 'Unknown',
        ];
    }

    /**
     * Check Modrinth API for latest version
     */
    private function checkModrinth(string $projectId): array
    {
        $response = Http::withHeaders([
            'Accept' => 'application/json',
            'User-Agent' => 'FirefrostGaming/ModpackChecker/1.0',
        ])->get("https://api.modrinth.com/v2/project/{$projectId}/version");

        if (!$response->successful()) {
            throw new \Exception('Modrinth API request failed: ' . $response->status());
        }

        $versions = $response->json();
        $latest = $versions[0] ?? [];

        // Get project name
        $projectResponse = Http::withHeaders([
            'Accept' => 'application/json',
            'User-Agent' => 'FirefrostGaming/ModpackChecker/1.0',
        ])->get("https://api.modrinth.com/v2/project/{$projectId}");

        $project = $projectResponse->json();

        return [
            'name' => $project['title'] ?? 'Unknown',
            'version' => $latest['version_number'] ?? 'Unknown',
        ];
    }

    /**
     * Check FTB (modpacks.ch) API for latest version
     */
    private function checkFTB(string $modpackId): array
    {
        $response = Http::withHeaders([
            'Accept' => 'application/json',
        ])->get("https://api.modpacks.ch/public/modpack/{$modpackId}");

        if (!$response->successful()) {
            throw new \Exception('FTB API request failed: ' . $response->status());
        }

        $data = $response->json();

        return [
            'name' => $data['name'] ?? 'Unknown',
            'version' => $data['versions'][0]['name'] ?? 'Unknown',
        ];
    }

    /**
     * Check Technic API for latest version
     */
    private function checkTechnic(string $slug): array
    {
        $response = Http::withHeaders([
            'Accept' => 'application/json',
        ])->get("https://api.technicpack.net/modpack/{$slug}?build=1");

        if (!$response->successful()) {
            throw new \Exception('Technic API request failed: ' . $response->status());
        }

        $data = $response->json();

        return [
            'name' => $data['displayName'] ?? $data['name'] ?? 'Unknown',
            'version' => $data['version'] ?? 'Unknown',
        ];
    }

    /**
     * Get cached update status for all servers (dashboard badge view)
     * Called once on page load, returns status for all user's servers
     */
    public function getStatus(Request $request): JsonResponse
    {
        $user = $request->user();

        // Get all servers the user has access to
        $serverIds = $user->accessibleServers()->pluck('id')->toArray();

        // Query our cache table for these servers
        $statuses = DB::table('modpackchecker_servers')
            ->whereIn('server_id', $serverIds)
            ->get()
            ->keyBy('server_uuid');

        $result = [];
        foreach ($statuses as $uuid => $status) {
            $result[$uuid] = [
                'update_available' => (bool) $status->update_available,
                'modpack_name' => $status->modpack_name,
                'current_version' => $status->current_version,
                'latest_version' => $status->latest_version,
            ];
        }

        return response()->json($result);
    }
}