//////////////////////////
// use texture.js without d3 to create discerning patterns on the email blocks
/////////////////////////////////////


// some faked dom, see https://github.com/riccardoscalco/textures/issues/17
function dom(name) {
  this.name = name;
  this.els = [];
  this.attrs = {};
}
dom.prototype.append = function(name) {
  if (name === "defs") return this;
  if (this.name === undefined) {
    this.name = name;
    return this;
  }
  var el = new dom(name);
  this.els.push(el);
  return el;
}
dom.prototype.attr = function(key, value) {
  this.attrs[key] = value;
  return this;
}
dom.prototype.toString = function() {
  var attrs = [];
  var k;
  for (k in this.attrs) {
    attrs += " " + k + "='" + this.attrs[k] + "'";
  }
  if (this.els.length) {
    return "<"+this.name+attrs+">"+this.els.map(function(el) { return el.toString()}).join('\n')+"</"+this.name+">";
  } else {
    return "<"+this.name+attrs+"/>"
  }
}
//////////// end of faked dom ///////////////////////////////

let categoryMap = {};
let textureMap = {};
function getColoredTexture(i, color) {
	let j = i % 11; // update when adding items to switch:
	switch(j) {
		case 0:
			return textures.lines().size(4).strokeWidth(1).stroke(color);
		case 1:
			return textures.circles().radius(2).size(5).fill('none').strokeWidth(1).stroke(color).complement();
		case 2:
			return textures.lines().size(10).orientation("3/8").stroke(color);
		case 3:
			return textures.lines().heavier(4).thinner(.8).stroke(color);
		case 4:
			return textures.paths().d("hexagons").size(3).strokeWidth(1).stroke(color);
		case 5:
			return textures.lines().orientation("vertical", "horizontal").size(4).strokeWidth(1).shapeRendering("crispEdges").stroke(color);
		case 6:
			return textures.paths().d("hexagons").size(5).strokeWidth(2).stroke("rgba(0,0,0,0)").fill(color);
		case 7:
			return textures.circles().size(4).fill(color);
		case 8:
			return textures.circles().thicker().complement().fill(color);
		case 9:
			return textures.paths().d("caps").lighter().thicker().size(5).stroke(color);
		case 10:
			return textures.paths().d("hexagons").size(4).strokeWidth(2).stroke(color);
//	textures.lines().size(4).strokeWidth(1).orientation("-3/8"),
	}
};

const categoryColors = {
	"person": "#FA0800",
	"vehicle": "#80FF00",
	"outdoor": "#00FFFF",
	"animal": "#FF00FF",
	"accessory": "#FFFF00",
	"food": "#00FA85",
	"furniture": "#BB00FA",
	"indoor": "#8500FA",
	"electronic": "#FAD900",
	"kitchen": "#FA8500",
	"sports": "#0080FF",
    "appliance": "#FF0080",
}

function getColorForSuperCategory(name) {
	return categoryColors[name];
}

function getTextureForCategory(id) {

	let hash = id;
	if(!textureMap.hasOwnProperty(hash)) {
		let color = categoryColors[categoryMap[id]['supercategory']];
		textureMap[hash] = getColoredTexture(id, color);
	}

	return textureMap[hash];
}



class CocoCanvas {
	start(){
		this.catNavEl = document.getElementById('catNav');
		this.catNav2El = document.getElementById('catNav2');
		this.canvas = document.getElementById('svgCanvas');
		this.loadImagesBtnEl = document.getElementById("loadImages");
		this.loadLabelsBtnEl = document.getElementById("loadLabels");
		this.sceneSelectEl = document.getElementById('scene');
		this.savedBtnEl = document.getElementById('save');
		this.loadNav()
		this.annotations = [];

		this.loadImagesBtnEl.addEventListener('change', (e) => this.toggleImages(e));
		this.loadLabelsBtnEl.addEventListener('change', (e) => this.toggleLabels(e));
		this.savedBtnEl.addEventListener('click', function(e){
			if(this.savedBtnEl.disabled || this.annotations.length < 1) return;
			this.save();
		}.bind(this));
	}
	loadNav() {
		let r = new Request('/categories.json');
		fetch(r)
		  .then(response => response.json())
		  .then(categories => {
			  for(let cat of categories) {
				  categoryMap[cat['id']] = cat;
			  }
		    this.buildNav(categories);
		  }).catch(function(e){
			    console.error(e);
		  });
	}

	buildNav(categories) {
		let lastSuperCat = null;
		let supercategories = []
		let supercategoriesEls = {}
		// create menu's per supercategory, divide these over left & right
		for(let cat of categories) {
			if(supercategories.indexOf(cat['supercategory']) < 0) {
				supercategories.push(cat['supercategory']);
			}
		}
		for(let supercat of supercategories) {
			let ulEl = crel('ul', {'data-name': supercat, 'class':'supercategory-'+supercat});
			supercategoriesEls[supercat] = ulEl;
			// first half left, other half right side of the page
			if(supercategories.indexOf(supercat)/supercategories.length < .5) {
				this.catNavEl.appendChild(ulEl);
			} else {
				this.catNav2El.appendChild(ulEl);
			}
		}

		// entries for the menus
		for(let cat of categories) {
//			let firstOfType = lastSuperCat != cat['supercategory'] ? ' first-of-super' : '';
//			lastSuperCat = cat['supercategory'];
			supercategoriesEls[cat['supercategory']].appendChild(crel('li', {
				'id': 'category-' + cat['id'],
//				'class': 'supercategory-' + cat['supercategory'],
				'on': {
					'click': (e) => {
						this.requestAnnotation(cat['id']);
					}
				}
			}, cat['name']));

		}


		this.defsEl = document.createElementNS("http://www.w3.org/2000/svg", 'defs');
		for(let cat of categories) {
			let texture = getTextureForCategory(cat['id']);
			let sel = new dom();
			texture(sel);
			this.defsEl.innerHTML += sel.toString();
		}
		this.canvas.appendChild(this.defsEl);
	}

	requestAnnotation(category_id) {
		let r = new Request(`/annotation.json?category=${category_id}&normalise=100`);
		return fetch(r)
		  .then(response => response.json())
		  .then(annotation => {
			  this.addAnnotationAsShape(annotation);
		  }).catch(function(e){
			    console.error(e);
		  });

	}

	pointsToD(points) {
		let start = points.shift()
		let d = `M${start[0].toPrecision(4)} ${start[1].toPrecision(4)} L `;
		points = points.map((p) => `${p[0].toPrecision(4)} ${p[1].toPrecision(4)}`);
		d += points.join(' ');
		return d;
	}

	getMousePosition(evt) {
		// from http://www.petercollingridge.co.uk/tutorials/svg/interactive/dragging/
	  let CTM = this.canvas.getScreenCTM();
	  return {
	    x: (evt.clientX - CTM.e) / CTM.a,
	    y: (evt.clientY - CTM.f) / CTM.d
	  };
	}

	addAnnotationAsShape(annotation) {
		console.log('Add annotation', annotation);

		let category = categoryMap[annotation['category_id']]
		let texture = getTextureForCategory(category['id']);

		let x = 500 - annotation['bbox'][2]/2;
		let y = 500 - annotation['bbox'][3]/2;
		let annEl = crel(document.createElementNS("http://www.w3.org/2000/svg", 'g'), {
			'data-id': annotation['id'],
			'transform': `translate(${x}, ${y})`,
			'on': {
				'mousedown': function(downE) {
					// after clicking the element should be the top element
					// and the last svg element is drawn on top.
					annEl.parentNode.appendChild(annEl);
//					console.log(downE);
//					console.log(this)
					let offset = this.getMousePosition(downE);

				    // Get initial translation amount
//					console.log(annEl.transform.baseVal);
				    let transform = annEl.transform.baseVal.getItem(0);
				    offset.x -= transform.matrix.e;
				    offset.y -= transform.matrix.f;

					let moveEvent = (moveE) => {
						let coord = this.getMousePosition(moveE);
						transform.matrix.e = coord.x - offset.x;
						transform.matrix.f = coord.y - offset.y;
//						annEl.setAttributeNS(null, "x", coord.x - offset.x);
//						annEl.setAttributeNS(null, "y", coord.y - offset.y);
					};


					document.addEventListener('mousemove', moveEvent);
					document.addEventListener('mouseup', (upE) => {
						document.removeEventListener('mousemove', moveEvent);
					});

				}.bind(this)
			}
		});

		for(let segment of annotation['segments']) {

			let pathEl = crel(document.createElementNS("http://www.w3.org/2000/svg", 'path'), {
				'fill': texture.url(),
				'd': this.pointsToD(segment)
			});
			annEl.appendChild(pathEl);
		}

		this.canvas.appendChild(annEl);

		// keep info on annotation elements in CocoCanvas object
		annotation['element'] = annEl;
		this.annotations.push(annotation);
		this.savedBtnEl.disabled = false;

		// based on status of checkboxes, add label or image (bit of a later hack)
		this.toggleImages();
		this.toggleLabels();
	}

	// convert annotation shapes on canvas to images, which are masked by the shape
	convertToImages() {
		console.log('convert');
		for(let annotation of this.annotations) {
			console.log(annotation);
			if(annotation['element'].getElementsByTagName('image').length) {
				//already done
				continue;
			}
			let scale = annotation['scale'];

			let bbox = annotation['is_normalised'] ? annotation['bbox_original'] : annotation['bbox'];
			let imgEl = crel(document.createElementNS("http://www.w3.org/2000/svg", 'image'), {
				'href': annotation['image']['coco_url'],
				'width': annotation['image']['width']* scale,
				'height': annotation['image']['height']* scale,
				'x': bbox[0] * -1 * scale,
				'y': bbox[1] * -1 * scale,
			});
			annotation['element'].prepend(imgEl );
		}
	}

	addLabels() {
		console.log('labels');
		for(let annotation of this.annotations) {
			console.log(annotation);
			if(annotation['element'].getElementsByTagName('text').length) {
				//already done
				continue;
			}

			let textEl = crel(document.createElementNS("http://www.w3.org/2000/svg", 'text'), {
				'x': annotation['bbox'][2] + 5,
				'y': annotation['bbox'][3],
			}, categoryMap[annotation['category_id']]['name']);
			annotation['element'].append(textEl );
		}
	}

	toggleImages(e) {
		if(this.loadImagesBtnEl.checked) {
			this.convertToImages();
			document.body.classList.remove('hideImages');
		}
		else {
			document.body.classList.add('hideImages');
		}
	}


	toggleLabels(e) {
		if(this.loadLabelsBtnEl.checked) {
			this.addLabels();
			document.body.classList.remove('hideLabels');
		}
		else {
			document.body.classList.add('hideLabels');
		}
	}
	
	save() {
		let scene = this.sceneSelectEl.value;
		let annotations = [];
		for (let ann of this.annotations) {
			annotations.push({
					'id': ann['id'],
					'x': ann.element.transform.baseVal.getItem(0).matrix.e,
					'y': ann.element.transform.baseVal.getItem(0).matrix.f
			});
		}
		
		let data = JSON.stringify({
			'scene': this.sceneSelectEl.value,
			'annotations': annotations
		});
		let r = new Request('/save', {'method': 'POST', 'body': data});
		fetch(r)
		  .then(response => response.json())
		  .then(submission => {
//			  alert("Something went wrong when saving the file");
			  // todo redirect to submission
			  console.log('saved', submission);
			  window.location = window.location + 'saved';
		  }).catch(function(e){
			    alert("Something went wrong when saving the file");
			    console.error(e);
		  });
	}
}

let cc = new CocoCanvas();
cc.start();

//for testing only:
//cc.requestAnnotation(1).then((e) => cc.convertToImages());