import Ajv from "npm:ajv@8.8.2";
import addFormats from "npm:ajv-formats@2.1.1";
import { load as yamlLoad } from "https://deno.land/x/js_yaml_port@3.14.0/js-yaml.js";
import { emptyDir } from "https://deno.land/std@0.173.0/fs/mod.ts";
import { Eta } from "https://deno.land/x/eta@v3.0.3/src/index.ts"

async function _loadYaml(fn) {
  return yamlLoad(await Deno.readTextFile(fn));
}

function getFlagEmoji(countryCode) {
  if (countryCode === 'xx') return "🏴‍☠️";
  const codePoints = countryCode
    .toUpperCase()
    .split('')
    .map(char =>  127397 + char.charCodeAt());
  return String.fromCodePoint(...codePoints);
}

async function test() {
  const ajv = new Ajv({ strict: false });
  addFormats(ajv);
  const schema = await _loadYaml("./schema.yaml");
  const validator = ajv.compile(schema);

  const list = await _loadYaml(`./events/events.yaml`);
  const ids = [];

  for (const item of list) {
    Deno.test(`${item.id}`, async () => {
      if (!validator(item)) {
        throw validator.errors;
      }
      if (ids.includes(item.id)) {
        throw `ID exists: ${item.id}`
      }

      ids.push(item.id)
    });
  }
}

async function build() {
  const list = await _loadYaml(`./events/events.yaml`);
  await emptyDir("./dist");
  const fn = "./dist/index.json";
  await Deno.writeTextFile(fn, JSON.stringify(list, null, 2));
  console.log(`File saved: `, fn);

  const readmeFn = "./README.md"
  const eta = new Eta({ views: "./" })
  //console.log(output)
  const warning = `<!--
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
DO NOT EDIT THIS FILE DIRECLY
EDIT "./README.tpl.eta" INSTEAD
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-->`

  await Deno.writeTextFile(readmeFn, warning + "\n\n" + eta.render("./README.tpl.eta", { events: list, getFlagEmoji }))
  console.log(`File saved: `, readmeFn);
}

switch (Deno.args[0] || "test") {
  case "test":
    await test();
    break;

  case "build":
    await build();
    break;
}