/* eslint-disable no-process-exit */
/* eslint-disable no-console */
/*
 * Copyright (C) Sapphirecode - All Rights Reserved
 * This file is part of console-app which is released under MIT.
 * See file 'LICENSE' for full license details.
 * Created by Timo Hocker <timo@scode.ovh>, May 2020
 */

/* eslint-disable max-lines-per-function */
/* eslint-disable complexity */
/* eslint-disable max-statements */
/* eslint-disable no-process-env */
import { Persistent } from '@sapphirecode/modelling';
import fs from 'fs-extra';
import yargs, { Options } from 'yargs';
import { Confirm, Input } from 'enquirer';

type OptionType =
  'string'
  | 'number'
  | 'boolean'
  | 'file'
  | 'folder'
  | 'path';

interface Option {
  name: string;
  type: OptionType;
  required?: boolean;
  default?: unknown;
  alias?: string;
  env?: string;
  description?: string;
  message?: string;
}

interface OptionProcess extends Option {
  filled: boolean;
  value?: unknown;
}

function get_string_type (type: OptionType): 'string'|'number'|'boolean' {
  if ([
    'string',
    'number',
    'boolean'
  ].includes (type))
    return type as ('string'|'number'|'boolean');
  if ([
    'file',
    'folder',
    'path'
  ].includes (type))
    return 'string';
  throw new Error (`unknown option type ${type}`);
}

export class InteractiveOptions extends Persistent {
  protected options: Array<OptionProcess>;
  protected quiet = false;

  public constructor (options: Array<Option>) {
    super ();
    this.options = options
      .map ((v) => ({ filled: false, ...v } as OptionProcess));
    for (const option of this.options) {
      if (
        typeof option.default !== 'undefined'
        && typeof option.default !== get_string_type (option.type)
      ) {
        throw new Error (
          `default does not match option type on ${option.name}`
        );
      }

      this.properties[option.name] = option.type;
    }
  }

  public async parse (): Promise<Record<string, unknown>> {
    await this.get_env_options ();
    await this.get_args_options ();
    await this.get_interactive_options ();
    return this.to_object ();
  }

  private async assign_arg (opt: OptionProcess, value: unknown): Promise<void> {
    if (opt.type === 'string') {
      opt.value = String (value);
      opt.filled = true;
      return;
    }
    if (opt.type === 'number') {
      if (![
        'string',
        'number'
      ].includes (typeof value))
        return;

      const as_num = parseInt (String (value));
      const is_num = !isNaN (as_num);
      if (is_num) {
        opt.value = as_num;
        opt.filled = true;
      }
      return;
    }
    if (opt.type === 'boolean') {
      if (![
        'string',
        'boolean',
        'number'
      ].includes (typeof value))
        return;

      const is_bool = [
        0,
        1
      ].includes (parseInt (String (value)))
      || (/^(?:true|false)$/ui).test (value as string);
      if (is_bool) {
        const as_bool = value === 1 || (/true/ui).test (value as string);
        opt.value = as_bool;
        opt.filled = true;
      }
      return;
    }
    if (
      opt.type === 'path'
      || opt.type === 'file'
      || opt.type === 'folder'
    ) {
      if (typeof value !== 'string' || !await fs.pathExists (value))
        return;
      if (opt.type === 'path') {
        opt.value = value;
        opt.filled = true;
        return;
      }
      const stat = await fs.stat (value);
      if (stat.isDirectory () === (opt.type === 'folder')) {
        opt.value = value;
        opt.filled = true;
      }
    }
  }

  private async get_env_options (): Promise<void> {
    await Promise.all (this.options.map ((opt) => {
      if (
        typeof opt.env !== 'undefined'
        && typeof process.env[opt.env] !== 'undefined'
      )
        return this.assign_arg (opt, process.env[opt.env]);
      return Promise.resolve ();
    }));
  }

  private async get_args_options (): Promise<void> {
    const yargs_config: Record<string, Options> = {
      quiet: {
        alias:    'q',
        default:  false,
        type:     'boolean',
        describe: 'do not ask for options interactively'
      },
      help: {
        alias:    'h',
        default:  false,
        type:     'boolean',
        describe: ''
      }
    };
    for (const opt of this.options) {
      yargs_config[opt.name] = {
        alias:    opt.alias,
        default:  opt.default,
        type:     get_string_type (opt.type),
        describe: opt.description
      };
    }
    const argv = yargs.options (yargs_config)
      .parse ();
    if (argv.help) {
      yargs.options (yargs_config)
        .showHelp ();
      process.exit (0);
    }
    this.quiet = argv.quiet as boolean;

    await Promise.all (this.options.map ((opt) => {
      if (typeof argv[opt.name] !== 'undefined')
        return this.assign_arg (opt, argv[opt.name]);
      return Promise.resolve ();
    }));
  }

  private async prompt (opt: OptionProcess): Promise<void> {
    if (opt.filled)
      return;
    if (
      opt.type === 'string'
      || opt.type === 'file'
      || opt.type === 'folder'
      || opt.type === 'path'
      || opt.type === 'number'
    ) {
      const value = await new Input ({
        message: opt.message,
        default: opt.default
      })
        .run ();
      await this.assign_arg (opt, value);
      return;
    }
    if (
      opt.type === 'boolean'
    ) {
      const value = await new Confirm ({
        message: opt.message,
        default: opt.default
      })
        .run ();
      await this.assign_arg (opt, value);
    }
  }

  private async get_interactive_options (): Promise<void> {
    if (this.quiet) {
      const missing = this.options.filter ((o) => !o.filled && o.required)
        .map ((o) => o.name);
      if (missing.length > 0) {
        console.error ('missing arguments:');
        console.error (missing.join (', '));
        process.exit (0);
      }
    }
    let invalid = false;
    for (const opt of this.options) {
      // eslint-disable-next-line no-await-in-loop
      await this.prompt (opt);
      if (opt.filled === false)
        invalid = true;
    }
    if (invalid)
      await this.get_interactive_options ();
  }
}