// Discord DM Moderation Integrations
// Purpose: Sends verification/private-access DMs and resolves reactions.
// Scope: Handles moderation request workflows tied to Discord DMs.
function createDmModerationHandlers(deps) {
  const {
    logger,
    client,
    lockdownAdminIds,
    attachDmMessage,
    getRequestByMessageId,
    approveRequest,
    denyRequest,
    attachPrivateAccessDmMessage,
    getPrivateAccessRequestByMessageId,
    approvePrivateAccessRequest,
    denyPrivateAccessRequest,
    isLockdownAdminUser,
    sanitizeMentions,
  } = deps;

  const APPROVE = '✅';
  const DENY = '❌';

  async function sendVerificationRequestDms(event) {
    const payload = event?.payload || {};
    const requestId = payload.id;
    if (!requestId) return;
    const createdAt = payload.createdAt ? new Date(payload.createdAt).toLocaleString() : 'unknown';
    const content = [
      '**Verification Request**',
      `Request ID: \`${requestId}\``,
      `Nickname: ${sanitizeMentions(payload.nickname || 'unknown')}`,
      `Identity key: \`${String(payload.cookieUserId || 'unknown')}\``,
      `IP: \`${String(payload.ip || 'unknown')}\``,
      `Created: ${createdAt}`,
      '',
      `React with ${APPROVE} to approve or ${DENY} to deny.`,
    ].join('\n');
    await Promise.all(Array.from(lockdownAdminIds).map(async (adminId) => {
      try {
        const user = await client.users.fetch(String(adminId));
        if (!user) return;
        const dm = await user.createDM();
        const message = await dm.send({ content, allowedMentions: { parse: [] } });
        try { await message.react(APPROVE); await message.react(DENY); } catch {}
        attachDmMessage(requestId, message.id, adminId);
      } catch (err) {
        logger.warn('Failed to DM lockdown admin for verification request', { requestId, adminId, error: err.message });
      }
    }));
  }

  async function sendPrivateRoverAccessRequestDms(event) {
    const payload = event?.payload || {};
    const requestId = payload.id;
    if (!requestId) return;
    const requester = payload?.requester || {};
    const createdAt = payload.createdAt ? new Date(payload.createdAt).toLocaleString() : 'unknown';
    const content = [
      '**Private Rover Access Request**',
      `Request ID: \`${requestId}\``,
      `Rover: ${sanitizeMentions(payload.roverName || payload.roverId || 'unknown')} (\`${String(payload.roverId || 'unknown')}\`)`,
      `Requester: ${sanitizeMentions(requester.nickname || requester.socketId || 'unknown')}`,
      `Role: \`${String(requester.role || 'unknown')}\``,
      `Verified: \`${requester.isVerified ? 'yes' : 'no'}\``,
      `Identity key: \`${String(requester.cookieUserId || 'unknown')}\``,
      `IP: \`${String(requester.ip || 'unknown')}\``,
      `Created: ${createdAt}`,
      '',
      `React with ${APPROVE} to approve or ${DENY} to deny.`,
    ].join('\n');
    await Promise.all(Array.from(lockdownAdminIds).map(async (adminId) => {
      try {
        const user = await client.users.fetch(String(adminId));
        if (!user) return;
        const dm = await user.createDM();
        const message = await dm.send({ content, allowedMentions: { parse: [] } });
        try { await message.react(APPROVE); await message.react(DENY); } catch {}
        attachPrivateAccessDmMessage(requestId, message.id, adminId);
      } catch (err) {
        logger.warn('Failed to DM lockdown admin for private rover access request', { requestId, adminId, error: err.message });
      }
    }));
  }

  async function handleVerificationReaction(reaction, user) {
    if (!reaction || !user || user.bot || !isLockdownAdminUser(user.id)) return;
    const emoji = reaction.emoji?.name;
    if (emoji !== APPROVE && emoji !== DENY) return;
    if (reaction.message?.partial || reaction.partial) {
      try { await reaction.fetch(); } catch { return; }
    }
    const linked = getRequestByMessageId(reaction.message?.id);
    if (!linked?.request || linked.request.status !== 'pending') return;
    if (emoji === APPROVE) {
      approveRequest(linked.request.id, user.id);
      await reaction.message.reply({
        content: `Approved request \`${linked.request.id}\`.`,
        allowedMentions: { parse: [] },
      });
    } else {
      denyRequest(linked.request.id, user.id);
      await reaction.message.reply({
        content: `Denied request \`${linked.request.id}\`.`,
        allowedMentions: { parse: [] },
      });
    }
    try {
      await reaction.message.reactions.removeAll();
    } catch {}
  }

  async function handlePrivateAccessReaction(reaction, user) {
    if (!reaction || !user || user.bot || !isLockdownAdminUser(user.id)) return;
    const emoji = reaction.emoji?.name;
    if (emoji !== APPROVE && emoji !== DENY) return;
    if (reaction.message?.partial || reaction.partial) {
      try { await reaction.fetch(); } catch { return; }
    }
    const linked = getPrivateAccessRequestByMessageId(reaction.message?.id);
    if (!linked?.request || linked.request.status !== 'pending') return;
    if (emoji === APPROVE) {
      const { assignedSocketId } = approvePrivateAccessRequest(linked.request.id, user.id);
      const assignmentNote = assignedSocketId
        ? ` Granted and assigned to socket \`${assignedSocketId}\`.`
        : ' Granted.';
      await reaction.message.reply({
        content: `Approved private access request \`${linked.request.id}\`.${assignmentNote}`,
        allowedMentions: { parse: [] },
      });
    } else {
      denyPrivateAccessRequest(linked.request.id, user.id);
      await reaction.message.reply({
        content: `Denied private access request \`${linked.request.id}\`.`,
        allowedMentions: { parse: [] },
      });
    }
    try {
      await reaction.message.reactions.removeAll();
    } catch {}
  }

  return {
    sendVerificationRequestDms,
    sendPrivateRoverAccessRequestDms,
    handleVerificationReaction,
    handlePrivateAccessReaction,
  };
}

module.exports = { createDmModerationHandlers };