#!/usr/bin/env node
/**
 * Manually process Gmail messages through match → parse → PocketBase save.
 *
 * Use when forwarding old receipts: Gmail Date may be "today", but trx_date
 * comes from the receipt body (Tanggal/Jam, Picked up on, …). Existing
 * invoice_id rows are skipped (unique constraint).
 *
 * Also expands .eml / message/rfc822 attachments (forward-as-attachment).
 *
 * Usage:
 *   npm run process-messages -w watcher -- --query 'newer_than:2d subject:"Pembayaran Berhasil!"'
 *   npm run process-messages -w watcher -- --ids 1a099bd61efd234d,1a099b8b9d239e5e
 *   npm run process-messages -w watcher -- --dry-run --max 20
 *
 * Options:
 *   --query <q>     Gmail search (default: in:inbox newer_than:30d)
 *   --ids <a,b>     Explicit message IDs (skips list search)
 *   --user <email>  Mailbox to use (default: first user with tokens)
 *   --max <n>       Max messages to process (default 500)
 *   --dry-run       Parse and log only; do not write PocketBase
 */

import {
  GOOGLE_CLIENT_ID,
  GOOGLE_CLIENT_SECRET,
  POCKETBASE_URL,
} from "../src/config.js";
import { getUserByEmail, listUsersWithTokens } from "../src/db.js";
import { gmailClientForUser } from "../src/google.js";
import { fetchAndLogMessage } from "../src/handlers/fetch-and-log-message.js";
import { matchRule } from "../src/handlers/match-rule.js";
import { parseMatchedMessage } from "../src/handlers/parse-matched-message.js";
import { saveSpending } from "../src/handlers/save-spending.js";
import { runPipeline } from "../src/pipeline.js";
import { processFetchedMessage } from "../src/process-fetched.js";
import { pocketbaseConfigured } from "../src/pocketbase/client.js";

const DEFAULT_QUERY = "in:inbox newer_than:30d";

function parseArgs(argv) {
  const out = {
    query: null,
    ids: [],
    user: null,
    max: 500,
    dryRun: false,
    help: false,
  };
  for (let i = 0; i < argv.length; i++) {
    const a = argv[i];
    if (a === "--help" || a === "-h") out.help = true;
    else if (a === "--dry-run") out.dryRun = true;
    else if (a === "--query") out.query = argv[++i];
    else if (a === "--ids") {
      out.ids = String(argv[++i] || "")
        .split(",")
        .map((s) => s.trim())
        .filter(Boolean);
    } else if (a === "--user") out.user = argv[++i];
    else if (a === "--max") out.max = Math.max(1, Number(argv[++i]) || 50);
    else if (a.startsWith("--query=")) out.query = a.slice("--query=".length);
    else if (a.startsWith("--ids=")) {
      out.ids = a
        .slice("--ids=".length)
        .split(",")
        .map((s) => s.trim())
        .filter(Boolean);
    } else if (a.startsWith("--user=")) out.user = a.slice("--user=".length);
    else if (a.startsWith("--max=")) {
      out.max = Math.max(1, Number(a.slice("--max=".length)) || 50);
    }
  }
  return out;
}

function makeLog() {
  const line = (level, obj, msg) => {
    const payload =
      typeof obj === "string" ? { msg: obj } : { ...(obj || {}), msg };
    const { msg: message, ...rest } = payload;
    console.log(
      JSON.stringify({
        level,
        time: new Date().toISOString(),
        ...rest,
        msg: message || msg,
      }),
    );
  };
  return {
    info: (obj, msg) => line("info", obj, msg),
    warn: (obj, msg) => line("warn", obj, msg),
    error: (obj, msg) => line("error", obj, msg),
  };
}

async function listMessageIds(gmail, query, max) {
  const ids = [];
  let pageToken;
  while (ids.length < max) {
    const { data } = await gmail.users.messages.list({
      userId: "me",
      q: query,
      maxResults: Math.min(50, max - ids.length),
      pageToken,
    });
    for (const m of data.messages || []) {
      if (m.id) ids.push(m.id);
      if (ids.length >= max) break;
    }
    pageToken = data.nextPageToken;
    if (!pageToken) break;
  }
  return ids;
}

async function main() {
  const args = parseArgs(process.argv.slice(2));
  if (args.help) {
    console.log(`Usage: process-messages [--query q] [--ids id1,id2] [--user email] [--max n] [--dry-run]
Default query: ${DEFAULT_QUERY}`);
    process.exit(0);
  }

  if (!GOOGLE_CLIENT_ID || !GOOGLE_CLIENT_SECRET) {
    console.error("Missing GOOGLE_CLIENT_ID / GOOGLE_CLIENT_SECRET in .env");
    process.exit(1);
  }

  const users = listUsersWithTokens();
  if (!users.length) {
    console.error("No signed-in users with tokens. Sign in via the web UI first.");
    process.exit(1);
  }

  let user = users[0];
  if (args.user) {
    const byEmail = getUserByEmail(args.user);
    const byId = users.find((u) => String(u.id) === String(args.user));
    user = byEmail || byId || null;
    if (!user) {
      console.error(`User not found: ${args.user}`);
      process.exit(1);
    }
  }

  const log = makeLog();
  const gmail = await gmailClientForUser(user.id);

  let messageIds = args.ids;
  if (!messageIds.length) {
    const query = args.query || DEFAULT_QUERY;
    log.info({ query, max: args.max, user: user.email }, "process-messages: listing");
    messageIds = await listMessageIds(gmail, query, args.max);
  } else {
    messageIds = messageIds.slice(0, args.max);
  }

  log.info(
    {
      count: messageIds.length,
      user: user.email,
      dryRun: args.dryRun,
      pocketbase: pocketbaseConfigured() ? POCKETBASE_URL : null,
    },
    "process-messages: start",
  );

  const fetchHandlers = [fetchAndLogMessage];
  const processHandlers = args.dryRun
    ? [matchRule, parseMatchedMessage]
    : [matchRule, parseMatchedMessage, saveSpending];

  const summary = {
    processed: 0,
    matched: 0,
    saved: 0,
    duplicate: 0,
    skipped: 0,
    errors: 0,
  };

  for (const messageId of messageIds) {
    try {
      const fetched = await runPipeline(fetchHandlers, {
        notification: { emailAddress: user.email, historyId: null },
        userId: user.id,
        messageId,
        gmail,
        log,
      });

      if (!fetched.message) {
        summary.skipped++;
        continue;
      }

      const results = await processFetchedMessage(fetched, processHandlers);
      for (const result of results) {
        summary.processed++;
        if (!result.rule) {
          summary.skipped++;
          continue;
        }
        summary.matched++;

        if (args.dryRun) {
          log.info(
            {
              messageId: result.messageId,
              kind: result.parsed?.kind,
              invoice_id: result.parsed?.reference,
              amount: result.parsed?.amount,
              occurredAt: result.parsed?.occurredAt,
            },
            "process-messages: dry-run parsed",
          );
          continue;
        }

        if (result.saved) summary.saved++;
        else if (result.duplicate) summary.duplicate++;
        else if (result.error) summary.errors++;
        else summary.skipped++;
      }
    } catch (err) {
      summary.errors++;
      log.error(
        { messageId, err: err.message || String(err) },
        "process-messages: failed",
      );
    }
  }

  log.info(summary, "process-messages: done");
}

main().catch((err) => {
  console.error(err);
  process.exit(1);
});