import attributes from './attributes'
import * as hooklib from 'hooks'
import hooks from './hooks'

function svg (pattern)
{
  this.body = '';
  this.style = '';
  this.script = '';
  this.header = '';
  this.footer = '';
  this.defs = '';
  this.pattern = pattern; // Needed to expose pattern to hooks
  this.prefix = '<?xml version="1.0" encoding="UTF-8" standalone="no"?>';
  this.attributes = new attributes();
  this.attributes.add("xmlns", "http://www.w3.org/2000/svg");
  this.attributes.add("xmlns:svg", "http://www.w3.org/2000/svg");
  this.attributes.add("xmlns:xlink", "http://www.w3.org/1999/xlink");
  this.hooks = hooks.all;
  for(let k in hooklib) this[k] = hooklib[k];
  for(let k in this.hooks) this.hook(k, this[k]);

  return this;

  /** Method to attach preRenderSvg hooks on */
  this.prototype.preRenderSvg = function() {};

  /** Method to attach postRenderSvg hooks on */
  this.prototype.postRenderSvg = function() {};

  /** Method to attach insertText hooks on */
  this.prototype.insertText = function() {};

  /** Renders a draft object as SVG */
  this.prototype.render = function (pattern)
  {
    this.preRenderSvg();
    this.svg = this.prefix;
    this.svg += this.renderComments(this.header);
    this.svg += this.renderSvgTag(pattern);
    this.svg += this.renderStyle();
    this.svg += this.renderScript();
    this.svg += this.renderDefs();
    this.svg += this.openGroup('draftContainer');
    for (let partId in pattern.parts) {
      let part = pattern.parts[partId];
      if (part.render) {
        this.svg += this.openGroup(part.id, part.attributes);
        this.svg += this.renderPart(part);
        this.svg += this.closeGroup();
      }
    }
    this.svg += this.closeGroup();
    this.svg += this.nl()+'</svg>';
    this.svg += this.renderComments(this.footer);
    this.postRenderSvg();
    return this.svg;
  }

  /** Returns SVG code for the opening SVG tag */
  this.prototype.renderSvgTag = funtion (pattern)
  {
    let svg = '<svg';
    this.indent();
    svg += this.nl()+this.attributes.render();
    this.outdent();
    svg += this.nl()+'>'+this.nl();

    return svg;
  }

  /** Returns SVG code for the style block */
  this.prototype.renderStyle = function ()
  {
    let svg = '<style type="text/css"> <![CDATA[ ';
    this.indent();
    svg += this.nl()+this.style;
    this.outdent();
    svg += this.nl()+']]>'+this.nl()+'</style>'+this.nl();
    return svg;
  }

  /** Returns SVG code for the script block */
  this.prototype.renderScript = function ()
  {
    let svg = '<script type="text/javascript"> <![CDATA[';
    this.indent();
    svg += this.nl()+this.script;
    this.outdent();
    svg += this.nl()+']]>'+this.nl()+'</script>'+this.nl();

    return svg;
  }

  /** Returns SVG code for the defs block */
  this.prototype.renderDefs = function ()
  {
    let svg = '<defs id="defs">';
    this.indent();
    svg += this.nl()+this.defs;
    this.outdent();
    svg += this.nl()+'</defs>'+this.nl();

    return svg;
  }

  /** Returns SVG code for a comment block */
  this.prototype.renderComments = function (comments)
  {
    return this.nl()+this.nl()+'<!--'+this.nl()+comments+this.nl()+'-->';
  }

  /** Returns SVG code for a Part object */
  this.prototype.renderPart = function (part)
  {
		let svg = '';
    for (let key in part.paths) {
      let path = part.paths[key];
      if(path.render) svg += this.renderPath(path);
    }
    for (let key in part.points) {
      if(part.points[key].attributes.get('data-text')) {
        svg += this.renderPoint(part.points[key]);
      }
    }
    for (let key in part.snippets) {
      let snippet = part.snippets[key];
      svg += this.renderSnippet(snippet);
    }

    return svg;
  }

  /** Returns SVG code for a Point object */
  this.prototype.renderPoint = function (point)
  {
    let svg = ''
    if(point.attributes.get('data-text')) svg += this.renderText(point);

    return svg;
  }

  /** Returns SVG code for a Path object */
  this.prototype.renderPath = function (path)
  {
    if(!path.attributes.get('id')) path.attributes.add('id', this.getUid());
    path.attributes.add('d', path.asPathstring());

    return `${this.nl()}<path ${path.attributes.render()} />${this.renderPathText(path)}`;
  }

  this.prototype.renderPathText = function (path)
  {
    let text = path.attributes.get('data-text');
    if(!text) return false;
    let attributes = path.attributes.renderIfPrefixIs('data-text-');
    let svg = this.nl()+'<text>';
    this.indent();
    svg += `<textPath xlink:href="#${path.attributes.get('id')}" startOffset="50%"><tspan ${attributes}>${text}</tspan></textPath>`;
    this.outdent();
    svg += this.nl()+'</text>';

    return svg;
  }

  this.prototype.renderText = function (point)
  {
    let text = point.attributes.get('data-text');
    if(!text) return false;

    point.attributes.add('data-text-x', point.x);
    point.attributes.add('data-text-y', point.y);
    let attributes = point.attributes.renderIfPrefixIs('data-text-');
    let svg = `${this.nl()}<text ${point.attributes.renderIfPrefixIs('data-text-')}>`;
    this.indent();
    svg += `<tspan>${text}</tspan>`;
    this.outdent();
    svg += this.nl()+'</text>';

    return svg;
  }

  /** Returns SVG code for a snippet */
  this.prototype.renderSnippet = function (snippet)
  {
    let svg = this.nl();
    svg += `<use x="${snippet.anchor.x}" y="${snippet.anchor.y}" `
    svg += `xlink:href="#${snippet.def}" ${snippet.attributes.render()}>`;
    if(snippet.description) {
      svg += `<title>${snippet.description}</title>`;
    }
    svg += '</use>';

    return svg;
  }

  /** Returns SVG code to open a group */
  this.prototype.openGroup = function (id)
  {
    let svg = this.nl()+this.nl();
    svg += `<!-- Start of group #${id} -->`;
    svg += this.nl();
    svg += `<g id="${id}">`;
    this.indent();
    this.openGroups.push(id);

    return svg;
  }

  /** Returns SVG code to close a group */
  this.prototype.closeGroup = function ()
  {
    this.outdent();

    return `${this.nl()}</g>${this.nl()}<!-- end of group #${this.openGroups.pop()} -->`;
  }

  /** Returns a linebreak + identation */
  this.prototype.nl = function ()
  {
    return "\n"+this.tab();
  }

  /** Returns indentation */
  this.prototype.tab = function ()
  {
    let space = '';
    for (let i = 0; i < this.tabs; i++) {
      space += '  ';
    }

    return space;
  }

  /** Increases indentation by 1 */
  this.prototype.indent = function ()
  {
    this.tabs += 1;
  }

  /** Decreases indentation by 1 */
  this.prototype.outdent = function ()
  {
    this.tabs -= 1;
  }

  /** Returns an unused ID */
  this.prototype.getUid = function ()
  {
     this.freeId += 1;

     return ''+this.freeId;
  }
}

export default svg;