// you may not need all of these but they come up a lot
import fs from "fs";
import assert from "assert";
import logging from '../lib/logging.js';
import { mkdir, write } from "../lib/builderator.js";
import glob from "fast-glob";
import { Database }  from "duckdb-async";
import { UserPaymentProduct, User, Product, Payment } from "../lib/models.js";
import slugify from "slugify";

const log = logging.create(import.meta.url);

export const description = "Is used to load the data found in the django dump to the database."

// your command uses the npm package commander's options format
export const options = [
  ["--mode-split", "Split a django dump into multiple files per table with pk=id"],
  ["--mode-analyze", "Run in analysis mode, which loads the tables into duckdb."],
  ["--mode-import", "Use the split files in --split-dir to import"],
  ["--input <string>", "A string option with a default."],
]

// put required options in the required variable
export const required = [
  ["--split-dir <string>", "Directory where the split .json files go", "data_dump"],
  ["--duckdb <string>", "The duckdb to create.", "dump.duckdb"],
]

// handy function for checking things are good and aborting
const check = (test, fail_message) => {
  if(!test) {
    log.error(fail_message);
    process.exit(1);
  }
}

export const mode_split = async (opts) => {
  // it's easier to debug options with console
  const raw_data = JSON.parse(fs.readFileSync(opts.input));

  const tables = {};

  for(let row of raw_data) {
    assert(row.fields.id === undefined, `Bad ID ${JSON.stringify(row)}`);
    row.fields.id = row.pk;  // why did django do this? so weird

    if(tables[row.model] === undefined) {
      // first one
      tables[row.model] = [row.fields];
    } else {
      tables[row.model].push(row.fields);
    }
  }

  console.log(opts);
  mkdir(opts.splitDir);

  for(let [name, data] of Object.entries(tables)) {
    const out_file = `${opts.splitDir}/${name}.json`;
    console.log("WRITE", out_file);
    write(out_file, JSON.stringify(data, null, 4));
  }

  // due to how async/await works it's just easier to manually exit with exit codes
  process.exit(0);
}

export const mode_analyze = async (opts) => {
  console.log("ANALYZE", opts);
  const db = new Database(opts.duckdb);

  // glob the files in the splitDir
  const split_dir = await glob(`${opts.splitDir}/*.json`);

  for(let file_name of split_dir) {
    const [junk, table_name, ext] = file_name.split('.');

    console.log(">> TABLE", table_name, "CREATE FROM", file_name);
    await db.exec(`CREATE TABLE "${table_name}" AS SELECT * FROM "${file_name}"`);
    // syntax doesn't follow SQL for replace ? with variable
  }

  await db.close();
  process.exit(0);
}

export const mode_import = async (opts) => {
  console.log("IMPORT", opts);

  const db = new Database(opts.duckdb);
  // DDB go through each product

  const products = await db.all("SELECT * FROM PRODUCT");

  for(let product of products) {
    const my_product = await Product.insert({
      created_at: product.created_on,
      title: product.title,
      description: product.description,
      price: product.base_price,
      currency: "USD",
      currency_symbol: "$",
      active: product.active,
      slug: slugify(product.title, {lower: true, strict: true}),
      short_blurb: product.description,
      docs_url: product.private_location,
      poster: product.poster,
      category: "Python",
      created_by: "Zed A. Shaw",
      preorder: 1
    });

    const purchases = await db.all(`SELECT * FROM PURCHASE WHERE product=${product.id} AND state='PAID'`);

    console.log("PRODUCT", my_product.title, "PURCHASES", purchases.length);

    for(let purchase of purchases) {
      const cust_q = await db.all(`SELECT * FROM CUSTOMER WHERE id=${purchase.customer}`);
      const customer = cust_q[0];
      const fake_password = User.random_hex(10);

      let user = await User.register({
        created_at: customer.created_on,
        initials: "",
        full_name: customer.full_name,
        password: fake_password,
        password_repeat: fake_password,
        email: customer.email,
        unsubscribe: !customer.promotable,
        unsubscribed_on: null,
      });

      if(!user) {
        console.log("USER EXISTS LOADING", customer.email);
        user = await User.first({email: customer.email});
      } else {
        console.log("ADDED", user.email, user.id, "PASS", fake_password);
      }

      // create payment and then connect with upp
      const payment = await Payment.insert({
        created_at: purchase.created_on,
        system: purchase.purchase_system.toLowerCase(),
        status: "complete",
        internal_id: Payment.gen_internal_id(),
        sys_created_on: purchase.ended_on ? purchase.ended_on : purchase.created_on,
        sys_primary_id: purchase.service_data || "",
        sys_secondary_id: purchase.fsm_state,
        user_id: purchase.customer,
        status_reason: "imported",
      });

      const upp = await UserPaymentProduct.finish_purchase(user, payment, my_product);
    }
  }

  await db.close();
  process.exit(0);
}

export const main = async (opts) => {
  if(opts.modeSplit) {
    check(opts.input !== undefined, "--input required for --mode-split");
    await mode_split(opts);
  } else if(opts.modeAnalyze) {
    await mode_analyze(opts);
  } else if(opts.modeImport) {
    await mode_import(opts);
  } else {
    console.error("USAGE: need one of --mode-analyze, --mode-import, or --mode-sync. BACKUP THE DB FIRST.");
    process.exit(1);
  }
}