const path = require("path");
const fs = require("fs");
const questions = require("questions");
const colors = require("colors/safe");
const NodeZip = require("node-zip");

// info
const fileExt = "per";
const fileName = "person.json";

class Saver {
  public static load(filepath = "") {
    const ext = filepath.substr(filepath.length - 4);
    let valid = true;

    // validate the file
    if (!fs.existsSync(filepath)) {
      valid = false;
      process.stdout.write(colors.red("Error: File not found!"));
    }

    // validate the extension
    if (ext !== `.${fileExt}`) {
      valid = false;
      process.stdout.write(colors.red("Error: File not correct extension!"));
    }

    const zip = new NodeZip(fs.readFileSync(filepath), { base64: false, checkCRC32: true });

    if (Object.keys(zip.files).indexOf(fileName) < 0) {
      valid = false;
      process.stdout.write(colors.red("Error: File corrupt!"));
    }

    // only parse if valid
    if (valid) {
      const data = JSON.parse(zip.files[fileName]._data);
      return data;
    }

    return {};
  }

  public static convertJSONToDnD(filepath = "") {
    const json = JSON.parse(fs.readFileSync(filepath, "utf-8"));
    Saver.save(filepath.replace(".json", ".per"), json);
  }

  public static convertDnDToJSON(filepath = "") {
    const resource = Saver.load(filepath);
    fs.writeFileSync(filepath.replace(".per", ".json"), JSON.stringify(resource, null, 2));
  }

  public static save(filepath = "", inputData = {}) {
    const zip = new NodeZip();
    zip.file(fileName, JSON.stringify(inputData));

    // write the file
    const data = zip.generate({ base64: false, compression: "DEFLATE" });
    fs.writeFileSync(filepath, data, "binary");
  }

  // a way to easily finish out the wizard
  public static finish(outputDir, question, data, defaultName, cb) {
    // save the file or not
    questions.askOne({ info: colors.cyan(question) }, (result) => {
      if (result === "y" || result === "yes") {
        questions.askOne({ info: colors.cyan("filename"), required: false }, (name) => {
          name = (name.length >= 1) ? name : defaultName;

          const filename = `${name}.${fileExt}`;
          const filepath = path.join(outputDir, filename);

          this.save(filepath, data);
          process.stdout.write(colors.green(`Saving... ${filepath}\n`));

          if (cb) { cb(true); }
        });
      } else {
        process.stdout.write(colors.white("Exited without save.\n"));
        if (cb) { cb(false); }
      }
    });
  }
}

export default Saver;