import type { NormalizedMessage } from '@tower/types';
import { createLogger } from '@tower/logger';
import { WhatsAppSessionPool } from './session-pool';

const logger = createLogger('command-handler');

const PORTAL_BASE = process.env['TOWER_PORTAL_BASE_URL'] ?? 'http://localhost:3000';

const STOP_REGEX = /^\s*stop\s*$/i;
const START_REGEX = /^\s*start\s*$/i;
const PORTAL_REGEX = /^\s*portal\s*$/i;
const COMMANDS_REGEX = /^\s*commands\s*$/i;

export async function handleCommand(
  msg: NormalizedMessage,
  accountId: string,
  prisma: any,
  pool: WhatsAppSessionPool,
): Promise<boolean> {
  if (!msg.content) return false;
  const text = msg.content.trim();

  if (STOP_REGEX.test(text)) {
    return await handleStop(msg, accountId, prisma, pool);
  }
  if (START_REGEX.test(text)) {
    return await handleStart(msg, accountId, prisma, pool);
  }
  if (PORTAL_REGEX.test(text)) {
    return await handlePortal(msg, accountId, prisma, pool);
  }
  if (COMMANDS_REGEX.test(text)) {
    return await handleCommands(msg, accountId, pool);
  }
  return false;
}

async function handleStop(
  msg: NormalizedMessage,
  accountId: string,
  prisma: any,
  pool: WhatsAppSessionPool,
): Promise<boolean> {
  const group = await prisma.group.findUnique({
    where: { platform_platformId: { platform: 'whatsapp', platformId: msg.sourceGroupJid } },
    select: { id: true, tenantId: true, claimStatus: true },
  });
  if (!group || group.claimStatus !== 'CLAIMED' || !group.tenantId) {
    return false;
  }
  // Find or create a TowerUser by jid (phone not yet known for STOP-only flow)
  const phoneHash = `stop:${msg.senderJid}`;
  const user = await prisma.towerUser.upsert({
    where: { tenantId_phoneHash: { tenantId: group.tenantId, phoneHash } },
    update: { jid: msg.senderJid },
    create: {
      tenantId: group.tenantId,
      phoneHash,
      jid: msg.senderJid,
      displayName: msg.senderName ?? msg.senderJid,
    },
  });
  // Revoke all active consents in this group
  await prisma.consentRecord.updateMany({
    where: { userId: user.id, tenantId: group.tenantId, groupId: group.id, status: 'GRANTED' },
    data: { status: 'REVOKED', revokedAt: new Date() },
  });
  await prisma.memberOptOut.create({
    data: {
      tenantId: group.tenantId,
      userId: user.id,
      groupId: group.id,
      reason: 'STOP_KEYWORD',
    },
  });
  await prisma.auditEvent.create({
    data: {
      tenantId: group.tenantId,
      actorType: 'MEMBER',
      actorId: user.id,
      action: 'MEMBER_OPT_OUT',
      resourceType: 'TowerUser',
      resourceId: user.id,
      payload: { jid: msg.senderJid, groupId: group.id, reason: 'STOP_KEYWORD' },
    },
  });
  try {
    await pool.sendMessage(
      accountId,
      msg.senderJid,
      "You've been opted out. Type START in this group to rejoin.",
    );
  } catch (err) {
    logger.warn({ err, jid: msg.senderJid }, 'Failed to send STOP confirmation DM');
  }
  logger.info({ jid: msg.senderJid, groupId: group.id }, 'STOP processed');
  return true;
}

async function handleStart(
  msg: NormalizedMessage,
  accountId: string,
  prisma: any,
  pool: WhatsAppSessionPool,
): Promise<boolean> {
  const group = await prisma.group.findUnique({
    where: { platform_platformId: { platform: 'whatsapp', platformId: msg.sourceGroupJid } },
    select: { id: true, tenantId: true, claimStatus: true },
  });
  if (!group || group.claimStatus !== 'CLAIMED' || !group.tenantId) {
    return false;
  }
  const phoneHash = `stop:${msg.senderJid}`;
  const user = await prisma.towerUser.upsert({
    where: { tenantId_phoneHash: { tenantId: group.tenantId, phoneHash } },
    update: { jid: msg.senderJid },
    create: {
      tenantId: group.tenantId,
      phoneHash,
      jid: msg.senderJid,
      displayName: msg.senderName ?? msg.senderJid,
    },
  });
  const existing = await prisma.consentRecord.findFirst({
    where: { userId: user.id, tenantId: group.tenantId, groupId: group.id },
  });
  if (existing) {
    await prisma.consentRecord.update({
      where: { id: existing.id },
      data: {
        status: 'GRANTED',
        scopes: existing.scopes.length > 0 ? existing.scopes : ['INGEST', 'DISPLAY'],
        retentionDays: existing.retentionDays,
        revokedAt: null,
        effectiveAt: new Date(),
      },
    });
  } else {
    await prisma.consentRecord.create({
      data: {
        tenantId: group.tenantId,
        groupId: group.id,
        userId: user.id,
        scopes: ['INGEST', 'DISPLAY'],
        retentionDays: 90,
        policyVersion: 'v1',
        status: 'GRANTED',
        proofEventId: user.id,
      },
    });
  }
  try {
    await pool.sendMessage(
      accountId,
      msg.senderJid,
      "Welcome back. Your default scopes (INGEST, DISPLAY) are re-granted. Visit your portal to customize: " +
        `${PORTAL_BASE}/my`,
    );
  } catch (err) {
    logger.warn({ err, jid: msg.senderJid }, 'Failed to send START confirmation DM');
  }
  logger.info({ jid: msg.senderJid, groupId: group.id }, 'START processed');
  return true;
}

async function handlePortal(
  msg: NormalizedMessage,
  accountId: string,
  prisma: any,
  pool: WhatsAppSessionPool,
): Promise<boolean> {
  const group = await prisma.group.findUnique({
    where: { platform_platformId: { platform: 'whatsapp', platformId: msg.sourceGroupJid } },
    select: { id: true, tenantId: true, claimStatus: true },
  });
  if (!group || group.claimStatus !== 'CLAIMED' || !group.tenantId) {
    return false;
  }
  // Reuse same phoneHash scheme as STOP/START so the same user is found
  const phoneHash = `stop:${msg.senderJid}`;
  const user = await prisma.towerUser.upsert({
    where: { tenantId_phoneHash: { tenantId: group.tenantId, phoneHash } },
    update: { jid: msg.senderJid },
    create: {
      tenantId: group.tenantId,
      phoneHash,
      jid: msg.senderJid,
      displayName: msg.senderName ?? msg.senderJid,
    },
  });
  const onboardingToken = await issueOnboardingToken(prisma, group.tenantId, group.id, msg.senderJid);
  try {
    await pool.sendMessage(
      accountId,
      msg.senderJid,
      `Manage your data: ${PORTAL_BASE}/onboard?token=${onboardingToken}`,
    );
  } catch (err) {
    logger.warn({ err, jid: msg.senderJid }, 'Failed to send PORTAL link DM');
  }
  return true;
}

async function handleCommands(
  msg: NormalizedMessage,
  accountId: string,
  pool: WhatsAppSessionPool,
): Promise<boolean> {
  try {
    await pool.sendMessage(
      accountId,
      msg.senderJid,
      'TOWER commands: STOP (opt out), START (rejoin), PORTAL (get your data link).',
    );
  } catch (err) {
    logger.warn({ err, jid: msg.senderJid }, 'Failed to send COMMANDS reply');
  }
  return true;
}

async function issueOnboardingToken(
  prisma: any,
  tenantId: string,
  groupId: string,
  jid: string,
): Promise<string> {
  // For Phase 2B the onboarding token is the base64url({groupId, jid, tenantId}) shape.
  // The API re-verifies this token (decodes the payload) and trusts the OTP step
  // for actual authentication. In a future phase we can sign with JWT_SECRET here.
  const payload = { tenantId, groupId, jid };
  return Buffer.from(JSON.stringify(payload), 'utf8').toString('base64url');
}