<?php

namespace App\Services\InsForge;

use App\Models\User;
use Illuminate\Support\Facades\Hash;
use Illuminate\Support\Facades\Session;

class InsForgeAuthService
{
    public const SESSION_ACCESS_TOKEN = 'insforge_access_token';

    public const SESSION_REFRESH_COOKIE = 'insforge_refresh_cookie';

    public function __construct(private readonly InsForgeClient $client) {}

    public function attemptLogin(string $email, string $password): User
    {
        $response = $this->client->send('POST', '/api/auth/sessions', [
            'email' => $email,
            'password' => $password,
        ]);

        $body = $response->json() ?? [];

        $accessToken = $body['accessToken'] ?? $body['access_token'] ?? null;

        if (! is_string($accessToken) || $accessToken === '') {
            throw new InsForgeException(null, 500, 'InsForge login response did not contain an access token.');
        }

        Session::put(self::SESSION_ACCESS_TOKEN, $accessToken);
        Session::put(self::SESSION_REFRESH_COOKIE, $this->extractRefreshCookie($response) ?? ($body['refreshToken'] ?? null));

        $authUser = is_array($body['user'] ?? null) ? $body['user'] : [];

        $profile = $this->ensureProfile(
            id: $authUser['id'] ?? null,
            email: $email,
            password: $password,
            fallbackName: $authUser['name']
                ?? (is_array($authUser['profile'] ?? null) ? ($authUser['profile']['name'] ?? null) : null)
                ?? explode('@', $email)[0],
        );

        return $this->hydrateProfile($profile);
    }

    public function profileById(?string $id): ?User
    {
        if ($id === null) {
            return null;
        }

        $profile = $this->client
            ->withToken(Session::get(self::SESSION_ACCESS_TOKEN))
            ->getRecord('users', $id);

        if ($profile === null || ! ($profile['is_active'] ?? false)) {
            return null;
        }

        return $this->hydrateProfile($profile);
    }

    public function refreshAccessToken(): bool
    {
        $cookie = Session::get(self::SESSION_REFRESH_COOKIE);

        if (! is_string($cookie) || $cookie === '') {
            return false;
        }

        try {
            $response = $this->client->send('POST', '/api/auth/refresh', headers: ['Cookie' => $cookie]);
        } catch (InsForgeException) {
            return false;
        }

        $accessToken = ($response->json() ?? [])['accessToken']
            ?? ($response->json() ?? [])['access_token']
            ?? null;

        if (! is_string($accessToken) || $accessToken === '') {
            return false;
        }

        Session::put(self::SESSION_ACCESS_TOKEN, $accessToken);

        return true;
    }

    public function clearSession(): void
    {
        Session::forget([self::SESSION_ACCESS_TOKEN, self::SESSION_REFRESH_COOKIE]);
    }

    public static function accessTokenExpiresInSeconds(): ?int
    {
        $token = Session::get(self::SESSION_ACCESS_TOKEN);

        if (! is_string($token) || substr_count($token, '.') !== 2) {
            return null;
        }

        $payload = json_decode(base64_decode(strtr(explode('.', $token)[1], '-_', '+/').str_repeat('=', 4 - strlen(explode('.', $token)[1]) % 4), true), true);

        return isset($payload['exp']) ? (int) $payload['exp'] - time() : null;
    }

    private function ensureProfile(?string $id, string $email, string $password, string $fallbackName): array
    {
        $existing = $this->client->listRecords('users', ['email' => 'eq.'.$email])[0] ?? null;

        if ($existing !== null) {
            return $existing;
        }

        $attributes = array_filter([
            'id' => $id,
            'name' => $fallbackName,
            'email' => $email,
            'password' => Hash::make($password),
            'role' => 'operator',
            'is_active' => true,
        ], fn ($value) => $value !== null);

        $this->client->insertRecord('users', [$attributes], asUser: false);

        return $this->client->listRecords('users', ['email' => 'eq.'.$email])[0] ?? $attributes;
    }

    private function hydrateProfile(array $profile): User
    {
        $user = new User;

        $user->forceFill([
            'id' => $profile['id'],
            'name' => $profile['name'] ?? '',
            'email' => $profile['email'],
            'password' => $profile['password'] ?? '',
            'role' => $profile['role'] ?? 'operator',
            'is_active' => (bool) ($profile['is_active'] ?? false),
        ]);

        return $user;
    }

    private function extractRefreshCookie($response): ?string
    {
        foreach ((array) $response->headers() as $name => $values) {
            if (strtolower((string) $name) !== 'set-cookie') {
                continue;
            }

            foreach ((array) $values as $value) {
                $firstPair = explode(';', trim((string) $value))[0];

                if (str_contains($firstPair, 'refresh')) {
                    return $firstPair;
                }
            }
        }

        return null;
    }
}