/**
 * Local Goose v1.49 canary routing helpers (loopback only).
 * Production hosts are refused; see docs/goose-v149-canary-runbook.md.
 */
import fs from 'node:fs';
import path from 'node:path';
import { fileURLToPath } from 'node:url';

import { createCanaryPolicy, resolveCanaryTarget } from '../release-gate/canary-routing.mjs';
import { applyRealLlmSkipDefaults } from './goose-v149-real-llm-gate.mjs';
import { loadMemindEnvFiles } from './memind-runtime-profile.mjs';

const memindRoot = path.join(path.dirname(fileURLToPath(import.meta.url)), '..');

function loadEnvFile(filePath) {
  if (!fs.existsSync(filePath)) return;
  for (const line of fs.readFileSync(filePath, 'utf8').split('\n')) {
    const trimmed = line.trim();
    if (!trimmed || trimmed.startsWith('#')) continue;
    const eq = trimmed.indexOf('=');
    if (eq < 0) continue;
    const key = trimmed.slice(0, eq).trim();
    let value = trimmed.slice(eq + 1).trim();
    if (
      (value.startsWith('"') && value.endsWith('"'))
      || (value.startsWith("'") && value.endsWith("'"))
    ) {
      value = value.slice(1, -1);
    }
    if (!(key in process.env)) process.env[key] = value;
  }
}

loadEnvFile(path.join(memindRoot, '.env.local'));

export const GOOSE_V149_CANARY_BEGIN = '# GOOSE_V149_CANARY_BEGIN';
export const GOOSE_V149_CANARY_END = '# GOOSE_V149_CANARY_END';

/** Force-apply GOOSE_V149 canary block from .env.local (overrides .env). */
export function applyGooseV149CanaryBlockEnv(env = process.env, rootDir = memindRoot) {
  const envFile = path.join(rootDir, '.env.local');
  if (!fs.existsSync(envFile)) return;
  const lines = fs.readFileSync(envFile, 'utf8').split('\n');
  let inBlock = false;
  for (const line of lines) {
    const trimmed = line.trim();
    if (trimmed === GOOSE_V149_CANARY_BEGIN) {
      inBlock = true;
      continue;
    }
    if (trimmed === GOOSE_V149_CANARY_END) break;
    if (!inBlock || !trimmed || trimmed.startsWith('#')) continue;
    const eq = trimmed.indexOf('=');
    if (eq < 0) continue;
    const key = trimmed.slice(0, eq).trim();
    let value = trimmed.slice(eq + 1).trim();
    if (
      (value.startsWith('"') && value.endsWith('"'))
      || (value.startsWith("'") && value.endsWith("'"))
    ) {
      value = value.slice(1, -1);
    }
    env[key] = value;
  }
}

function applyLocalScenarioCredentials(env) {
  if (!env.JOHN_PASSWORD && !env.H5_ACCESS_PASSWORD && !env.MEMIND_PASSWORD) {
    env.JOHN_PASSWORD = '981122tj';
  }
  if (!env.RELEASE_GATE_SCENARIO_USERNAME) {
    env.RELEASE_GATE_SCENARIO_USERNAME = 'john';
  }
  return env;
}

/** Load Memind env files then force-apply the GOOSE_V149 canary block (legacy memory, loopback targets). */
export function prepareGooseV149CheckEnv(env = process.env, rootDir = memindRoot) {
  loadMemindEnvFiles(rootDir, env);
  applyGooseV149CanaryBlockEnv(env, rootDir);
  applyLocalScenarioCredentials(env);
  applyRealLlmSkipDefaults(env);
  const canary = resolveGooseApiTargetsFromEnv(env);
  if (canary?.mode && canary.mode !== 'off' && env.GOOSE_V149_MEMORY_DRIFT_REFRESH_AFTER_SMOKE == null) {
    env.GOOSE_V149_MEMORY_DRIFT_REFRESH_AFTER_SMOKE = '1';
  }
  return env;
}

export const GOOSE_CANARY_MODES = new Set(['off', 'all', 'users']);

const BLOCKED_HOSTS = new Set([
  '58.38.22.103',
  '120.26.184.105',
  '103.tkmind.cn',
  '105.tkmind.cn',
]);

export const DEFAULT_GOOSE_STABLE_TARGET = 'https://127.0.0.1:18006';
export const DEFAULT_GOOSE_V149_TARGET = 'https://127.0.0.1:18049';

function csvSet(value) {
  return new Set(
    String(value ?? '')
      .split(',')
      .map((item) => item.trim())
      .filter(Boolean),
  );
}

export function parseGooseCanaryMode(env = process.env) {
  const mode = String(env.TKMIND_GOOSE_CANARY ?? 'off').trim().toLowerCase();
  if (!GOOSE_CANARY_MODES.has(mode)) {
    throw new Error(
      `Unsupported TKMIND_GOOSE_CANARY "${mode}". Expected: ${[...GOOSE_CANARY_MODES].join(', ')}`,
    );
  }
  return mode;
}

export function assertLoopbackGooseTarget(rawTarget, label = 'goose target') {
  let parsed;
  try {
    parsed = new URL(String(rawTarget ?? '').trim());
  } catch {
    throw new Error(`${label} must be a valid URL`);
  }
  if (parsed.protocol !== 'https:' && parsed.protocol !== 'http:') {
    throw new Error(`${label} must use http or https`);
  }
  const host = parsed.hostname.toLowerCase();
  if (BLOCKED_HOSTS.has(host)) {
    throw new Error(`${label} refuses production host ${host}`);
  }
  if (!['127.0.0.1', 'localhost', '::1'].includes(host)) {
    throw new Error(`${label} must be loopback (127.0.0.1 / localhost / ::1)`);
  }
  parsed.pathname = parsed.pathname.replace(/\/+$/, '') || '';
  parsed.search = '';
  parsed.hash = '';
  return parsed.toString().replace(/\/+$/, '');
}

export function gooseCanaryPolicyFromEnv(env = process.env) {
  const userIds = csvSet(env.TKMIND_GOOSE_CANARY_USER_IDS);
  const usernames = csvSet(env.TKMIND_GOOSE_CANARY_USERNAMES);
  const wechatUserIds = csvSet(env.TKMIND_GOOSE_CANARY_WECHAT_USER_IDS);
  if (!userIds.size && !usernames.size && !wechatUserIds.size) {
    return null;
  }
  return createCanaryPolicy({ userIds, usernames, wechatUserIds, candidateTarget: 'candidate' });
}

/**
 * Resolve Portal → goosed API targets for local v1.49 canary.
 * Returns null when canary is off (caller keeps legacy TKMIND_API_TARGET parsing).
 */
export function resolveGooseApiTargetsFromEnv(env = process.env) {
  const mode = parseGooseCanaryMode(env);
  if (mode === 'off') return null;

  const stable = assertLoopbackGooseTarget(
    env.TKMIND_API_TARGET_STABLE ?? DEFAULT_GOOSE_STABLE_TARGET,
    'TKMIND_API_TARGET_STABLE',
  );
  const v149 = assertLoopbackGooseTarget(
    env.TKMIND_API_TARGET_V149 ?? DEFAULT_GOOSE_V149_TARGET,
    'TKMIND_API_TARGET_V149',
  );

  if (mode === 'all') {
    return Object.freeze({
      mode,
      stable,
      v149,
      primary: v149,
      targets: [v149],
    });
  }

  const policy = gooseCanaryPolicyFromEnv(env);
  if (!policy) {
    throw new Error(
      'TKMIND_GOOSE_CANARY=users requires TKMIND_GOOSE_CANARY_USER_IDS and/or '
        + 'TKMIND_GOOSE_CANARY_USERNAMES / TKMIND_GOOSE_CANARY_WECHAT_USER_IDS',
    );
  }

  return Object.freeze({
    mode,
    stable,
    v149,
    primary: stable,
    targets: [stable, v149],
    policy,
  });
}

export function resolveGooseTargetForIdentity(identity, config) {
  if (!config || config.mode === 'off') {
    return config?.stable ?? DEFAULT_GOOSE_STABLE_TARGET;
  }
  if (config.mode === 'all') return config.v149;
  const targetKey = resolveCanaryTarget(identity, config.policy);
  return targetKey === 'candidate' ? config.v149 : config.stable;
}

export function describeGooseCanaryConfig(env = process.env) {
  const config = resolveGooseApiTargetsFromEnv(env);
  if (!config) {
    return {
      enabled: false,
      mode: 'off',
      stable: assertLoopbackGooseTarget(
        env.TKMIND_API_TARGET ?? DEFAULT_GOOSE_STABLE_TARGET,
        'TKMIND_API_TARGET',
      ),
      v149: assertLoopbackGooseTarget(
        env.TKMIND_API_TARGET_V149 ?? DEFAULT_GOOSE_V149_TARGET,
        'TKMIND_API_TARGET_V149',
      ),
    };
  }
  return {
    enabled: true,
    mode: config.mode,
    stable: config.stable,
    v149: config.v149,
    primary: config.primary,
    targets: [...config.targets],
    policySelectors: config.policy
      ? {
          userIds: [...config.policy.userIds],
          usernames: [...config.policy.usernames],
          wechatUserIds: [...config.policy.wechatUserIds],
        }
      : null,
  };
}

function printCliStatus() {
  const summary = describeGooseCanaryConfig(process.env);
  console.log(JSON.stringify(summary, null, 2));
}

const modulePath = fileURLToPath(import.meta.url);
const invokedPath = process.argv[1] ? path.resolve(process.argv[1]) : '';
if (invokedPath && invokedPath === modulePath) {
  printCliStatus();
}