import { emptyDir, exists } from "https://deno.land/std@0.119.0/fs/mod.ts";
import { parse as tomlParse } from "https://deno.land/std@0.173.0/encoding/toml.ts";
import { load as yamlLoad } from "https://deno.land/x/js_yaml_port@3.14.0/js-yaml.js";

let _silentMode = false;

export class DeConfEngine {
  constructor(options = {}) {
    this.options = options;
    this.srcDir = this.options.srcDir || "./data";
    this.outputDir = this.options.outputDir || "./dist";
    this.publicUrl = this.options.publicUrl || "https://data.prgblockweek.com";
    this.githubUrl = this.options.githubUrl ||
      "https://github.com/utxo-foundation/prague-blockchain-week/tree/main/data";

    if (options.silentMode) {
      _silentMode = true;
    }
  }
  async init() {
    this.entries = [];
    for await (const f of Deno.readDir(this.srcDir)) {
      if (!f.name.match(/^\d+$/)) continue;
      const pkg = new DeConf_Package(f.name, this);
      await pkg.load([this.srcDir, f.name]);
      this.entries.push(pkg);
    }
  }
  async build() {
    await emptyDir(this.outputDir);
    for (const pkg of this.entries) {
      console.table(pkg.data.events.map((e) => e.data.index), ["name"]);
      await pkg.write(this.outputDir);
    }
    await _jsonWrite(
      [this.outputDir, "index.json"],
      this.entries.map((p) => ({
        id: p.id,
        name: p.data.index.name,
        dataUrl: p.data.index.dataUrl,
      })),
    );
  }
  async schemas(version = "1") {
    const schemaDir = `./utils/schema/${version}`;
    const arr = [];
    for await (const f of Deno.readDir(schemaDir)) {
      const m = f.name.match(/^(.+)\.yaml$/);
      if (!m) {
        continue;
      }
      arr.push({
        name: m[1],
        schema: Object.assign(
          { $id: this.schemaUrl(version, m[1]) },
          await _yamlLoad([schemaDir, f.name].join("/")),
        ),
      });
    }
    return arr.sort((x, y) => x.name > y.name ? 1 : -1);
  }
  schemaUrl(version = "1", type = "index") {
    return `${this.publicUrl}/schema/${version}/${type}.json`;
  }
  entriesList() {
    return this.entries.map((e) => e.id);
  }
}

class DeConf_Package {
  constructor(id, engine) {
    this.id = id;
    this.data = null;
    this.engine = engine;
  }

  async load(specDir) {
    const pkg = {};
    // load year index
    pkg.index = await _tomlLoad([...specDir, "index.toml"].join("/"));
    pkg.index.dataUrl = [this.engine.publicUrl, this.id].join("/");
    pkg.index.dataGithubUrl = [this.engine.githubUrl, this.id].join("/");
    //console.log(`\n##\n## [${pkg.index.name}] \n##`);
    // load sub-events
    pkg.events = [];
    for await (const ef of Deno.readDir([...specDir, "events"].join("/"))) {
      if (!ef.name.match(/^[\w\d\-]+$/)) continue;
      const ev = new DeConf_Event(ef.name);
      await ev.load([...specDir, "events", ef.name]);
      pkg.events.push(ev);
    }
    this.data = pkg;
  }
  async write(dir) {
    const outputDir = [dir, this.id].join("/");
    await emptyDir(outputDir);
    await _jsonWrite([outputDir, "index.json"], this.toJSON());
  }
  toJSON() {
    return Object.assign({ id: this.id }, this.data.index, {
      events: this.data.events,
      time: new Date(),
    });
  }
}

class DeConf_Event {
  constructor(id) {
    this.id = id;
    this.data = null;
  }

  async load(dir) {
    const efIndex = await _tomlLoad([...dir, "index.toml"].join("/"));
    const event = {
      index: { id: this.id, ...efIndex },
    };
    this.data = event;
  }

  toJSON() {
    return Object.assign({ id: this.id }, this.data.index);
  }
}

async function _tomlLoad(fn) {
  return tomlParse(await Deno.readTextFile(fn));
}
async function _yamlLoad(fn) {
  return yamlLoad(await Deno.readTextFile(fn));
}
async function _jsonWrite(fn, data) {
  if (Array.isArray(fn)) {
    fn = fn.join("/");
  }
  await Deno.writeTextFile(fn, JSON.stringify(data, null, 2));
  if (!_silentMode) {
    console.log(`${fn} writed`);
  }
  return true;
}