<?php

declare(strict_types=1);

namespace Mod\Names\Controllers;

use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Routing\Controller;
use Mod\Chain\Services\DaemonRpc;
use Mod\Chain\Services\WalletRpc;

/**
 * .lthn TLD registrar API.
 *
 *   GET  /v1/names/available/{name}  — check if name is available
 *   GET  /v1/names/lookup/{name}     — look up a registered name
 *   GET  /v1/names/search?q={query}  — search names
 *   POST /v1/names/register          — request name registration
 *   GET  /v1/names/directory         — list all names grouped by type
 */
class NamesController extends Controller
{
    public function __construct(
        private readonly DaemonRpc $rpc,
        private readonly WalletRpc $wallet,
    ) {}

    /**
     *   GET /v1/names/available/myname
     */
    public function available(string $name): JsonResponse
    {
        $name = strtolower(trim($name));

        if (! $this->isValidName($name)) {
            return response()->json([
                'available' => false,
                'reason' => 'Invalid name. Use 1-63 lowercase alphanumeric characters.',
            ]);
        }

        $alias = $this->rpc->getAliasByName($name);

        return response()->json([
            'name' => $name,
            'available' => $alias === null,
            'fqdn' => "{$name}.lthn",
        ]);
    }

    /**
     *   GET /v1/names/lookup/charon
     */
    public function lookup(string $name): JsonResponse
    {
        $alias = $this->rpc->getAliasByName(strtolower(trim($name)));

        if (! $alias) {
            return response()->json(['error' => 'Name not registered'], 404);
        }

        return response()->json([
            'name' => $name,
            'fqdn' => "{$name}.lthn",
            'address' => $alias['address'] ?? '',
            'comment' => $alias['comment'] ?? '',
            'registered' => true,
        ]);
    }

    /**
     *   GET /v1/names/search?q=gate
     */
    public function search(Request $request): JsonResponse
    {
        $query = strtolower(trim((string) $request->get('q')));
        $result = $this->rpc->getAllAliases();
        $aliases = $result['aliases'] ?? [];

        $matches = array_filter($aliases, function ($alias) use ($query) {
            return str_contains($alias['alias'] ?? '', $query)
                || str_contains($alias['comment'] ?? '', $query);
        });

        return response()->json([
            'query' => $query,
            'results' => array_values($matches),
            'count' => count($matches),
        ]);
    }

    /**
     *   GET /v1/names/directory
     */
    public function directory(): JsonResponse
    {
        $result = $this->rpc->getAllAliases();
        $aliases = $result['aliases'] ?? [];

        // Group by type from comment metadata
        $grouped = ['gateway' => [], 'service' => [], 'exit' => [], 'reserved' => [], 'user' => []];

        foreach ($aliases as $alias) {
            $comment = $alias['comment'] ?? '';
            if (str_contains($comment, 'type=gateway')) {
                $grouped['gateway'][] = $alias;
            } elseif (str_contains($comment, 'type=exit')) {
                $grouped['exit'][] = $alias;
            } elseif (str_contains($comment, 'type=service')) {
                $grouped['service'][] = $alias;
            } elseif (str_contains($comment, 'type=reserved')) {
                $grouped['reserved'][] = $alias;
            } else {
                $grouped['user'][] = $alias;
            }
        }

        return response()->json([
            'total' => count($aliases),
            'directory' => $grouped,
        ]);
    }

    /**
     *   POST /v1/names/register  {"name": "mysite", "address": "iTHN..."}
     */
    public function register(Request $request): JsonResponse
    {
        $name = strtolower(trim((string) $request->input('name')));
        $address = trim((string) $request->input('address'));
        $comment = trim((string) $request->input('comment', 'v=lthn1;type=user'));

        if (! $this->isValidName($name)) {
            return response()->json([
                'error' => 'Invalid name. Use 1-63 lowercase alphanumeric characters.',
            ], 422);
        }

        if (empty($address) || ! str_starts_with($address, 'iTHN')) {
            return response()->json([
                'error' => 'Invalid Lethean address.',
            ], 422);
        }

        // Check availability on chain
        $existing = $this->rpc->getAliasByName($name);
        if ($existing !== null) {
            return response()->json([
                'error' => 'Name already registered.',
                'name' => $name,
            ], 409);
        }

        // Register via wallet RPC
        $result = $this->wallet->registerAlias($name, $address, $comment);

        if (isset($result['code']) || isset($result['error'])) {
            $message = $result['message'] ?? ($result['error'] ?? 'Unknown error');
            $code = 502;

            if (str_contains($message, 'NOT_ENOUGH_MONEY')) {
                $message = 'Registrar wallet has insufficient funds. Please try again later.';
                $code = 503;
            }

            return response()->json([
                'error' => $message,
                'name' => $name,
            ], $code);
        }

        if (isset($result['tx_id'])) {
            return response()->json([
                'name' => $name,
                'fqdn' => "{$name}.lthn",
                'address' => $address,
                'tx_id' => $result['tx_id'],
                'status' => 'pending',
            ], 201);
        }

        return response()->json([
            'error' => 'Unexpected response from chain',
            'details' => $result,
        ], 500);
    }

    private function isValidName(string $name): bool
    {
        return (bool) preg_match('/^[a-z0-9][a-z0-9-]{0,62}$/', $name);
    }
}