/**
 * ╔══════════════════════════════════════════════════════════════════════════════╗
 * ║  ⛔  PROPRIETARY SOFTWARE — ALL RIGHTS RESERVED — LOV 3.1 NEON NOIR  ⛔    ║
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 * ║                                                                            ║
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 * ║  UNAUTHORIZED REVERSE ENGINEERING, DEOBFUSCATION, DECOMPILATION,           ║
 * ║  REPRODUCTION, OR DISTRIBUTION IS A CRIMINAL OFFENSE.                      ║
 * ║                                                                            ║
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 * ║  █                                                                      █  ║
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 * ║  █  • Reverse engineer license validation or security logic             █  ║
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 * ║  █                                                                      █  ║
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 * ║                                                                            ║
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 * ║                                                                            ║
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 */
import {
  INJECT_CONFIG_URL,
  SUPABASE_ANON_KEY,
  LICENSE_CACHE_TTL_MS,
} from './constants.js';
import { getSettings, setSettings } from './storage.js';

export function emptyLicenseState() {
  return {
    status: 'unknown',
    plan: null,
    expiresAt: null,
    boundEmail: null,
    config: null,
    licenseHash: null,
    lastChecked: 0,
    error: null,
  };
}

async function computeLicenseHash(key) {
  try {
    const enc = new TextEncoder().encode(key);
    const buf = await crypto.subtle.digest('SHA-256', enc);
    return Array.from(new Uint8Array(buf))
      .map((b) => b.toString(16).padStart(2, '0'))
      .join('')
      .slice(0, 16);
  } catch (_) {
    return null;
  }
}

export async function getLicenseState({ force = false } = {}) {
  const settings = await getSettings();
  const key = settings.licenseKey;
  const email = settings.userEmail || null;
  const hwid = settings.deviceId || null;
  const cached = settings.licenseState || emptyLicenseState();

  if (!key) return emptyLicenseState();

  const fresh = Date.now() - (cached.lastChecked || 0) < LICENSE_CACHE_TTL_MS;
  if (!force && fresh && cached.status === 'valid') return cached;

  return validateLicense(key, email, hwid);
}

export async function validateLicense(key, email, hwid) {
  const trimmed = (key || '').trim();
  if (!trimmed) {
    const s = { ...emptyLicenseState(), status: 'invalid', error: 'Chave vazia' };
    await persistLicenseState(s);
    return s;
  }

  let res;
  try {
    
    const body = { key: trimmed };
    if (email) body.email = email;

    res = await fetch(INJECT_CONFIG_URL, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        apikey: SUPABASE_ANON_KEY,
        Authorization: `Bearer ${SUPABASE_ANON_KEY}`,
      },
      body: JSON.stringify(body),
    });
  } catch (e) {
    
    const cached = (await getSettings()).licenseState || emptyLicenseState();
    return { ...cached, status: cached.status === 'valid' ? 'valid' : 'transient', error: 'Sem conexão', lastChecked: cached.lastChecked };
  }

  let data = {};
  try {
    data = await res.json();
  } catch (_) {}

  if (res.ok && data?.config) {
    const state = {
      status: 'valid',
      plan: data.license?.plan || null,
      expiresAt: data.license?.expires_at || null,
      boundEmail: data.license?.bound_email || null,
      config: data.config,
      licenseHash: await computeLicenseHash(trimmed),
      lastChecked: Date.now(),
      error: null,
    };
    await persistLicenseState(state, { licenseKey: trimmed });
    return state;
  }

  const status = mapErrorToStatus(res.status, data?.error, data?.reason);

  if (status === 'transient' || status === 'device_mismatch') {
    const prev = (await getSettings()).licenseState || emptyLicenseState();
    return { ...prev, status, error: data?.error || `HTTP ${res.status}`, reason: data?.reason || null };
  }

  const state = {
    ...emptyLicenseState(),
    status,
    error: data?.error || `HTTP ${res.status}`,
    reason: data?.reason || null,
    lastChecked: Date.now(),
  };
  await persistLicenseState(state);
  return state;
}

export async function clearLicense() {
  await setSettings({
    licenseKey: '',
    licenseState: emptyLicenseState(),
  });
}

async function persistLicenseState(state, extra = {}) {
  await setSettings({ ...extra, licenseState: state });
}

function mapErrorToStatus(httpStatus, errorMsg, reason) {
  const r = String(reason || '').toLowerCase();
  if (r === 'revoked')          return 'revoked';
  if (r === 'expired')          return 'expired';
  if (r === 'device_mismatch')  return 'device_mismatch';
  if (r === 'post_reset_guard') return 'device_mismatch'; 
  if (r === 'transient')        return 'transient';
  if (r === 'invalid_key')      return 'invalid';

  if (httpStatus >= 500 || httpStatus === 429) return 'transient';

  const msg = String(errorMsg || '').toLowerCase();
  if (msg.includes('expirada') || msg.includes('expired')) return 'expired';
  if (msg.includes('revogada') || msg.includes('revoked')) return 'revoked';
  
  if (msg.includes('dispositivo') || msg.includes('hwid') || msg.includes('device') ||
      msg.includes('resetada recentemente') || msg.includes('resetar')) return 'device_mismatch';
  
  if (httpStatus === 403 || httpStatus === 401) return 'invalid';
  
  return 'transient';
}
