const { Command } = require('./index');

/* WIP */
class Help {

  constructor(cmd) {
    this.cmd = cmd;
  };

  usage() {
    return this.cmd.fullName() + ' ' + this.cmd.usage();
  };

  description() {
    return this.cmd.description();
  };

  arguments() {
    return this.cmd.visibleArguments();
  };

  options() {
    return this.cmd.visibleOptions().map(option => ({term: option.flags, description: option.fullDescription()}));
  };

  commands() {
    return this.cmd.visibleCommands().map(cmd => ({term: cmd.helpTerm(), description: cmd.description()}));
  };

  largestTermLength() {
    return Math.max(
      this.cmd.largestArgLength(),
      this.cmd.largestOptionLength(),
      this.cmd.largestCommandHelpTermLength()
    );
  };

  pad(str, width) {
    return pad(str, width);
  };

  wrap(str, width, indent) {
    return optionalWrap(str, width, indent);
  };

  render() {
    const width = this.largestTermLength();
    const columns = process.stdout.columns || 80;
    const descriptionWidth = columns - width - 4;

    const formatList = (arr) => {
      return arr.map(({term, description}) => {
        if (description) {
          return this.pad(term, width) + '  ' + this.wrap(description, descriptionWidth, width + 2);
        }
        return term;
      }).join('\n').replace(/^/gm, '  ');
    }

    // Usage
    let output = ['Usage: ' + this.usage(), ''];

    // Description
    if (this.description()) {
      output = output.concat([this.description(), '']);
    }

    // Arguments
    if (this.arguments().length) {
      output = output.concat(['Arguments:', formatList(this.arguments()), '']);
    }

    // Options
    if (this.options().length) {
      output = output.concat(['Options:', formatList(this.options()), '']);
    }

    // Commands
    if (this.commands().length) {
      output = output.concat(['Commands:', formatList(this.commands()), '']);
    }

    return output.join('\n');
  };
}

class MyHelp extends Help {
  // custom render method
}

class MyCommand extends Command {
  createCommand(name) {
    return new this.constructor(name);
  };

  /* WIP */
  fullName() {
    let cmdName = this.name();
    if (this.alias()) {
      cmdName = cmdName + '|' + this.alias();
    }
    let parentCmdNames = '';
    for (let parentCmd = this.parent; parentCmd; parentCmd = parentCmd.parent) {
      parentCmdNames = parentCmd.name() + ' ' + parentCmdNames;
    }
    return parentCmdNames + cmdName;
  };

  /* WIP */
  helpInformation() {
    return (new MyHelp(this)).render();
  };
}