/**
 * Module dependencies.
 */

var Base = require('./compiler');
var inherits = require('inherits');

/**
 * Expose compiler.
 */

module.exports = Compiler;

/**
 * Initialize a new `Compiler`.
 */

function Compiler(options) {
  options = options || {};
  Base.call(this, options);
  this.indentation = typeof options.indent === 'string' ? options.indent : '  ';
}

/**
 * Inherit from `Base.prototype`.
 */

inherits(Compiler, Base);

/**
 * Compile `node`.
 */

Compiler.prototype.compile = function(node){
  return this.stylesheet(node);
};

/**
 * Visit stylesheet node.
 */

Compiler.prototype.stylesheet = function(node){
  return this.mapVisit(node.stylesheet.rules, '\n\n');
};

/**
 * Visit comment node.
 */

Compiler.prototype.comment = function(node){
  return this.emit(this.indent() + '/*' + node.comment + '*/', node.position);
};

/**
 * Visit import node.
 */

Compiler.prototype.import = function(node){
  return this.emit('@import ' + node.import + ';', node.position);
};

/**
 * Visit media node.
 */

Compiler.prototype.media = function(node){
  return this.emit('@media ' + node.media, node.position)
    + this.emit(
        ' {\n'
        + this.indent(1))
    + this.mapVisit(node.rules, '\n\n')
    + this.emit(
        this.indent(-1)
        + '\n}');
};

/**
 * Visit document node.
 */

Compiler.prototype.document = function(node){
  var doc = '@' + (node.vendor || '') + 'document ' + node.document;

  return this.emit(doc, node.position)
    + this.emit(
        ' '
      + ' {\n'
      + this.indent(1))
    + this.mapVisit(node.rules, '\n\n')
    + this.emit(
        this.indent(-1)
        + '\n}');
};

/**
 * Visit charset node.
 */

Compiler.prototype.charset = function(node){
  return this.emit('@charset ' + node.charset + ';', node.position);
};

/**
 * Visit namespace node.
 */

Compiler.prototype.namespace = function(node){
  return this.emit('@namespace ' + node.namespace + ';', node.position);
};

/**
 * Visit supports node.
 */

Compiler.prototype.supports = function(node){
  return this.emit('@supports ' + node.supports, node.position)
    + this.emit(
      ' {\n'
      + this.indent(1))
    + this.mapVisit(node.rules, '\n\n')
    + this.emit(
        this.indent(-1)
        + '\n}');
};

/**
 * Visit keyframes node.
 */

Compiler.prototype.keyframes = function(node){
  return this.emit('@' + (node.vendor || '') + 'keyframes ' + node.name, node.position)
    + this.emit(
      ' {\n'
      + this.indent(1))
    + this.mapVisit(node.keyframes, '\n')
    + this.emit(
        this.indent(-1)
        + '}');
};

/**
 * Visit keyframe node.
 */

Compiler.prototype.keyframe = function(node){
  var decls = node.declarations;

  return this.emit(this.indent())
    + this.emit(node.values.join(', '), node.position)
    + this.emit(
      ' {\n'
      + this.indent(1))
    + this.mapVisit(decls, '\n')
    + this.emit(
      this.indent(-1)
      + '\n'
      + this.indent() + '}\n');
};

/**
 * Visit page node.
 */

Compiler.prototype.page = function(node){
  var sel = node.selectors.length
    ? node.selectors.join(', ') + ' '
    : '';

  return this.emit('@page ' + sel, node.position)
    + this.emit('{\n')
    + this.emit(this.indent(1))
    + this.mapVisit(node.declarations, '\n')
    + this.emit(this.indent(-1))
    + this.emit('\n}');
};

/**
 * Visit font-face node.
 */

Compiler.prototype['font-face'] = function(node){
  return this.emit('@font-face ', node.position)
    + this.emit('{\n')
    + this.emit(this.indent(1))
    + this.mapVisit(node.declarations, '\n')
    + this.emit(this.indent(-1))
    + this.emit('\n}');
};

/**
 * Visit host node.
 */

Compiler.prototype.host = function(node){
  return this.emit('@host', node.position)
    + this.emit(
        ' {\n'
        + this.indent(1))
    + this.mapVisit(node.rules, '\n\n')
    + this.emit(
        this.indent(-1)
        + '\n}');
};

/**
 * Visit custom-media node.
 */

Compiler.prototype['custom-media'] = function(node){
  return this.emit('@custom-media ' + node.name + ' ' + node.media + ';', node.position);
};

/**
 * Visit rule node.
 */

Compiler.prototype.rule = function(node){
  var indent = this.indent();
  var decls = node.declarations;
  if (!decls.length) return '';

  return this.emit(node.selectors.map(function(s){ return indent + s }).join(',\n'), node.position)
    + this.emit(' {\n')
    + this.emit(this.indent(1))
    + this.mapVisit(decls, '\n')
    + this.emit(this.indent(-1))
    + this.emit('\n' + this.indent() + '}');
};

/**
 * Visit declaration node.
 */

Compiler.prototype.declaration = function(node){
  return this.emit(this.indent())
    + this.emit(node.property + ': ' + node.value, node.position)
    + this.emit(';');
};

/**
 * Increase, decrease or return current indentation.
 */

Compiler.prototype.indent = function(level) {
  this.level = this.level || 1;

  if (null != level) {
    this.level += level;
    return '';
  }

  return Array(this.level).join(this.indentation);
};