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var map_extent = {minx:120.849955,maxx:122.254740,miny:30.672371,maxy:31.862257};

// Extend the Array class
Array.prototype.max = function () {
	return Math.max.apply(null, this);
};
Array.prototype.min = function () {
	return Math.min.apply(null, this);
};
Array.prototype.mean = function () {
	var i, sum;
	for (i = 0, sum = 0; i < this.length; i++)
		sum += this[i];
	return sum / this.length;
};
Array.prototype.pip = function (x, y) {
	var i, j, c = false;
	for (i = 0, j = this.length - 1; i < this.length; j = i++) {
		if (((this[i][1] > y) != (this[j][1] > y)) &&
			(x < (this[j][0] - this[i][0]) * (y - this[i][1]) / (this[j][1] - this[i][1]) + this[i][0])) {
			c = !c;
		}
	}
	return c;
}

var kriging = function () {
	var kriging = {};
	var createArrayWithValues = function (value, n) {
		var array = [];
		for (var i = 0; i < n; i++) {
			array.push(value);
		}
		return array;
	};
	// Matrix algebra
	kriging_matrix_diag = function (c, n) {
		var Z = createArrayWithValues(0, n * n);
		for (i = 0; i < n; i++) Z[i * n + i] = c;
		return Z;
	};
	kriging_matrix_transpose = function (X, n, m) {
		var i, j, Z = Array(m * n);
		for (i = 0; i < n; i++)
			for (j = 0; j < m; j++)
				Z[j * n + i] = X[i * m + j];
		return Z;
	};
	kriging_matrix_scale = function (X, c, n, m) {
		var i, j;
		for (i = 0; i < n; i++)
			for (j = 0; j < m; j++)
				X[i * m + j] *= c;
	};
	kriging_matrix_add = function (X, Y, n, m) {
		var i, j, Z = Array(n * m);
		for (i = 0; i < n; i++)
			for (j = 0; j < m; j++)
				Z[i * m + j] = X[i * m + j] + Y[i * m + j];
		return Z;
	};
	// Naive matrix multiplication
	kriging_matrix_multiply = function (X, Y, n, m, p) {
		var i, j, k, Z = Array(n * p);
		for (i = 0; i < n; i++) {
			for (j = 0; j < p; j++) {
				Z[i * p + j] = 0;
				for (k = 0; k < m; k++)
					Z[i * p + j] += X[i * m + k] * Y[k * p + j];
			}
		}
		return Z;
	};
	// Cholesky decomposition
	kriging_matrix_chol = function (X, n) {
		var i, j, k, sum, p = Array(n);
		for (i = 0; i < n; i++) p[i] = X[i * n + i];
		for (i = 0; i < n; i++) {
			for (j = 0; j < i; j++)
				p[i] -= X[i * n + j] * X[i * n + j];
			if (p[i] <= 0) return false;
			p[i] = Math.sqrt(p[i]);
			for (j = i + 1; j < n; j++) {
				for (k = 0; k < i; k++)
					X[j * n + i] -= X[j * n + k] * X[i * n + k];
				X[j * n + i] /= p[i];
			}
		}
		for (i = 0; i < n; i++) X[i * n + i] = p[i];
		return true;
	};
	// Inversion of cholesky decomposition
	kriging_matrix_chol2inv = function (X, n) {
		var i, j, k, sum;
		for (i = 0; i < n; i++) {
			X[i * n + i] = 1 / X[i * n + i];
			for (j = i + 1; j < n; j++) {
				sum = 0;
				for (k = i; k < j; k++)
					sum -= X[j * n + k] * X[k * n + i];
				X[j * n + i] = sum / X[j * n + j];
			}
		}
		for (i = 0; i < n; i++)
			for (j = i + 1; j < n; j++)
				X[i * n + j] = 0;
		for (i = 0; i < n; i++) {
			X[i * n + i] *= X[i * n + i];
			for (k = i + 1; k < n; k++)
				X[i * n + i] += X[k * n + i] * X[k * n + i];
			for (j = i + 1; j < n; j++)
				for (k = j; k < n; k++)
					X[i * n + j] += X[k * n + i] * X[k * n + j];
		}
		for (i = 0; i < n; i++)
			for (j = 0; j < i; j++)
				X[i * n + j] = X[j * n + i];

	};
	// Inversion via gauss-jordan elimination
	kriging_matrix_solve = function (X, n) {
		var m = n;
		var b = Array(n * n);
		var indxc = Array(n);
		var indxr = Array(n);
		var ipiv = Array(n);
		var i, icol, irow, j, k, l, ll;
		var big, dum, pivinv, temp;

		for (i = 0; i < n; i++)
			for (j = 0; j < n; j++) {
				if (i == j) b[i * n + j] = 1;
				else b[i * n + j] = 0;
			}
		for (j = 0; j < n; j++) ipiv[j] = 0;
		for (i = 0; i < n; i++) {
			big = 0;
			for (j = 0; j < n; j++) {
				if (ipiv[j] != 1) {
					for (k = 0; k < n; k++) {
						if (ipiv[k] == 0) {
							if (Math.abs(X[j * n + k]) >= big) {
								big = Math.abs(X[j * n + k]);
								irow = j;
								icol = k;
							}
						}
					}
				}
			}
			++(ipiv[icol]);

			if (irow != icol) {
				for (l = 0; l < n; l++) {
					temp = X[irow * n + l];
					X[irow * n + l] = X[icol * n + l];
					X[icol * n + l] = temp;
				}
				for (l = 0; l < m; l++) {
					temp = b[irow * n + l];
					b[irow * n + l] = b[icol * n + l];
					b[icol * n + l] = temp;
				}
			}
			indxr[i] = irow;
			indxc[i] = icol;

			if (X[icol * n + icol] == 0) return false; // Singular

			pivinv = 1 / X[icol * n + icol];
			X[icol * n + icol] = 1;
			for (l = 0; l < n; l++) X[icol * n + l] *= pivinv;
			for (l = 0; l < m; l++) b[icol * n + l] *= pivinv;

			for (ll = 0; ll < n; ll++) {
				if (ll != icol) {
					dum = X[ll * n + icol];
					X[ll * n + icol] = 0;
					for (l = 0; l < n; l++) X[ll * n + l] -= X[icol * n + l] * dum;
					for (l = 0; l < m; l++) b[ll * n + l] -= b[icol * n + l] * dum;
				}
			}
		}
		for (l = (n - 1); l >= 0; l--)
			if (indxr[l] != indxc[l]) {
				for (k = 0; k < n; k++) {
					temp = X[k * n + indxr[l]];
					X[k * n + indxr[l]] = X[k * n + indxc[l]];
					X[k * n + indxc[l]] = temp;
				}
			}

		return true;
	}

	// Variogram models
	kriging_variogram_gaussian = function (h, nugget, range, sill, A) {
		return nugget + ((sill - nugget) / range) *
			(1.0 - Math.exp(-(1.0 / A) * Math.pow(h / range, 2)));
	};
	kriging_variogram_exponential = function (h, nugget, range, sill, A) {
		return nugget + ((sill - nugget) / range) *
			(1.0 - Math.exp(-(1.0 / A) * (h / range)));
	};
	kriging_variogram_spherical = function (h, nugget, range, sill, A) {
		if (h > range) return nugget + (sill - nugget) / range;
		return nugget + ((sill - nugget) / range) *
			(1.5 * (h / range) - 0.5 * Math.pow(h / range, 3));
	};

	// Train using gaussian processes with bayesian priors
	kriging.train = function (t, x, y, model, sigma2, alpha) {
		var variogram = {
			t: t,
			x: x,
			y: y,
			nugget: 0.0,
			range: 0.0,
			sill: 0.0,
			A: 1 / 3,
			n: 0
		};
		switch (model) {
			case "gaussian":
				variogram.model = kriging_variogram_gaussian;
				break;
			case "exponential":
				variogram.model = kriging_variogram_exponential;
				break;
			case "spherical":
				variogram.model = kriging_variogram_spherical;
				break;
		};

		// Lag distance/semivariance
		var i, j, k, l, n = t.length;
		var distance = Array((n * n - n) / 2);
		for (i = 0, k = 0; i < n; i++)
			for (j = 0; j < i; j++, k++) {
				distance[k] = Array(2);
				distance[k][0] = Math.pow(
					Math.pow(x[i] - x[j], 2) +
					Math.pow(y[i] - y[j], 2), 0.5);
				distance[k][1] = Math.abs(t[i] - t[j]);
			}
		distance.sort(function (a, b) { return a[0] - b[0]; });
		variogram.range = distance[(n * n - n) / 2 - 1][0];

		// Bin lag distance
		var lags = ((n * n - n) / 2) > 30 ? 30 : (n * n - n) / 2;
		var tolerance = variogram.range / lags;
		var lag = createArrayWithValues(0, lags);
		var semi = createArrayWithValues(0, lags);
		if (lags < 30) {
			for (l = 0; l < lags; l++) {
				lag[l] = distance[l][0];
				semi[l] = distance[l][1];
			}
		}
		else {
			for (i = 0, j = 0, k = 0, l = 0; i < lags && j < ((n * n - n) / 2); i++, k = 0) {
				while (distance[j][0] <= ((i + 1) * tolerance)) {
					lag[l] += distance[j][0];
					semi[l] += distance[j][1];
					j++; k++;
					if (j >= ((n * n - n) / 2)) break;
				}
				if (k > 0) {
					lag[l] /= k;
					semi[l] /= k;
					l++;
				}
			}
			if (l < 2) return variogram; // Error: Not enough points
		}

		// Feature transformation
		n = l;
		variogram.range = lag[n - 1] - lag[0];
		var X = createArrayWithValues(1, 2 * n);
		var Y = Array(n);
		var A = variogram.A;
		for (i = 0; i < n; i++) {
			switch (model) {
				case "gaussian":
					X[i * 2 + 1] = 1.0 - Math.exp(-(1.0 / A) * Math.pow(lag[i] / variogram.range, 2));
					break;
				case "exponential":
					X[i * 2 + 1] = 1.0 - Math.exp(-(1.0 / A) * lag[i] / variogram.range);
					break;
				case "spherical":
					X[i * 2 + 1] = 1.5 * (lag[i] / variogram.range) -
						0.5 * Math.pow(lag[i] / variogram.range, 3);
					break;
			};
			Y[i] = semi[i];
		}

		// Least squares
		var Xt = kriging_matrix_transpose(X, n, 2);
		var Z = kriging_matrix_multiply(Xt, X, 2, n, 2);
		Z = kriging_matrix_add(Z, kriging_matrix_diag(1 / alpha, 2), 2, 2);
		var cloneZ = Z.slice(0);
		if (kriging_matrix_chol(Z, 2))
			kriging_matrix_chol2inv(Z, 2);
		else {
			kriging_matrix_solve(cloneZ, 2);
			Z = cloneZ;
		}
		var W = kriging_matrix_multiply(kriging_matrix_multiply(Z, Xt, 2, 2, n), Y, 2, n, 1);

		// Variogram parameters
		variogram.nugget = W[0];
		variogram.sill = W[1] * variogram.range + variogram.nugget;
		variogram.n = x.length;

		// Gram matrix with prior
		n = x.length;
		var K = Array(n * n);
		for (i = 0; i < n; i++) {
			for (j = 0; j < i; j++) {
				K[i * n + j] = variogram.model(Math.pow(Math.pow(x[i] - x[j], 2) +
					Math.pow(y[i] - y[j], 2), 0.5),
					variogram.nugget,
					variogram.range,
					variogram.sill,
					variogram.A);
				K[j * n + i] = K[i * n + j];
			}
			K[i * n + i] = variogram.model(0, variogram.nugget,
				variogram.range,
				variogram.sill,
				variogram.A);
		}

		// Inverse penalized Gram matrix projected to target vector
		var C = kriging_matrix_add(K, kriging_matrix_diag(sigma2, n), n, n);
		var cloneC = C.slice(0);
		if (kriging_matrix_chol(C, n))
			kriging_matrix_chol2inv(C, n);
		else {
			kriging_matrix_solve(cloneC, n);
			C = cloneC;
		}

		// Copy unprojected inverted matrix as K
		var K = C.slice(0);
		var M = kriging_matrix_multiply(C, t, n, n, 1);
		variogram.K = K;
		variogram.M = M;

		return variogram;
	};

	// Model prediction
	kriging.predict = function (x, y, variogram) {
		var i, k = Array(variogram.n);
		for (i = 0; i < variogram.n; i++)
			k[i] = variogram.model(Math.pow(Math.pow(x - variogram.x[i], 2) +
				Math.pow(y - variogram.y[i], 2), 0.5),
				variogram.nugget, variogram.range,
				variogram.sill, variogram.A);
		return kriging_matrix_multiply(k, variogram.M, 1, variogram.n, 1)[0];
	};
	kriging.variance = function (x, y, variogram) {
		var i, k = Array(variogram.n);
		for (i = 0; i < variogram.n; i++)
			k[i] = variogram.model(Math.pow(Math.pow(x - variogram.x[i], 2) +
				Math.pow(y - variogram.y[i], 2), 0.5),
				variogram.nugget, variogram.range,
				variogram.sill, variogram.A);
		return variogram.model(0, variogram.nugget, variogram.range,
			variogram.sill, variogram.A) +
			kriging_matrix_multiply(kriging_matrix_multiply(k, variogram.K,
				1, variogram.n, variogram.n),
				k, 1, variogram.n, 1)[0];
	};

	// Gridded matrices or contour paths
	kriging.grid = function (polygons, variogram, width) {
		var i, j, k, n = polygons.length;
		if (n == 0) return;

		// Boundaries of polygons space
		var xlim = [polygons[0][0][0], polygons[0][0][0]];
		var ylim = [polygons[0][0][1], polygons[0][0][1]];
		for (i = 0; i < n; i++) // Polygons
			for (j = 0; j < polygons[i].length; j++) { // Vertices
				if (polygons[i][j][0] < xlim[0])
					xlim[0] = polygons[i][j][0];
				if (polygons[i][j][0] > xlim[1])
					xlim[1] = polygons[i][j][0];
				if (polygons[i][j][1] < ylim[0])
					ylim[0] = polygons[i][j][1];
				if (polygons[i][j][1] > ylim[1])
					ylim[1] = polygons[i][j][1];
			}

		// Alloc for O(n^2) space
		var xtarget, ytarget;
		var a = Array(2), b = Array(2);
		var lxlim = Array(2); // Local dimensions
		var lylim = Array(2); // Local dimensions
		var x = Math.ceil((xlim[1] - xlim[0]) / width);
		var y = Math.ceil((ylim[1] - ylim[0]) / width);

		var A = Array(x + 1);
		for (i = 0; i <= x; i++) A[i] = Array(y + 1);
		for (i = 0; i < n; i++) {
			// Range for polygons[i]
			lxlim[0] = polygons[i][0][0];
			lxlim[1] = lxlim[0];
			lylim[0] = polygons[i][0][1];
			lylim[1] = lylim[0];
			for (j = 1; j < polygons[i].length; j++) { // Vertices
				if (polygons[i][j][0] < lxlim[0])
					lxlim[0] = polygons[i][j][0];
				if (polygons[i][j][0] > lxlim[1])
					lxlim[1] = polygons[i][j][0];
				if (polygons[i][j][1] < lylim[0])
					lylim[0] = polygons[i][j][1];
				if (polygons[i][j][1] > lylim[1])
					lylim[1] = polygons[i][j][1];
			}

			// Loop through polygon subspace
			a[0] = Math.floor(((lxlim[0] - ((lxlim[0] - xlim[0]) % width)) - xlim[0]) / width);
			a[1] = Math.ceil(((lxlim[1] - ((lxlim[1] - xlim[1]) % width)) - xlim[0]) / width);
			b[0] = Math.floor(((lylim[0] - ((lylim[0] - ylim[0]) % width)) - ylim[0]) / width);
			b[1] = Math.ceil(((lylim[1] - ((lylim[1] - ylim[1]) % width)) - ylim[0]) / width);
			for (j = a[0]; j <= a[1]; j++)
				for (k = b[0]; k <= b[1]; k++) {
					xtarget = xlim[0] + j * width;
					ytarget = ylim[0] + k * width;
					if (polygons[i].pip(xtarget, ytarget))
						A[j][k] = kriging.predict(xtarget,
							ytarget,
							variogram);
				}
		}
		A.xlim = xlim;
		A.ylim = ylim;
		A.zlim = [variogram.t.min(), variogram.t.max()];
		A.width = width;
		return A;
	};
	kriging.contour = function (value, polygons, variogram) {

	};

	// Plotting on the DOM
	kriging.plot = function (canvas, grid, xlim, ylim, colors) {
		// Clear screen
		var ctx = canvas.getContext("2d");
		ctx.clearRect(0, 0, canvas.width, canvas.height);

			var range = [xlim[1] - xlim[0], ylim[1] - ylim[0], grid.zlim[1] - grid.zlim[0]];
		var i, j, x, y, z;
		var n = grid.length;
		var m = grid[0].length;
		var wx = Math.ceil(grid.width * canvas.width / (xlim[1] - xlim[0]));
		var wy = Math.ceil(grid.width * canvas.height / (ylim[1] - ylim[0]));
		for (i = 0; i < n; i++){
			for (j = 0; j < m; j++) {
				if (grid[i][j] == undefined) continue;
				x = canvas.width * (i * grid.width + grid.xlim[0] - xlim[0]) / range[0];
				y = canvas.height * (1 - (j * grid.width + grid.ylim[0] - ylim[0]) / range[1]);
				z = (grid[i][j] - grid.zlim[0]) / range[2];
				if (z < 0.0) z = 0.0;
				if (z > 1.0) z = 1.0;
				ctx.fillStyle = colors[Math.floor((colors.length - 1) * z)];
				ctx.fillRect(Math.round(x - wx / 2), Math.round(y - wy / 2), wx, wy);
			}
		}
	};


	return kriging;
}();


function createKrigingGrid(dataItems,gridLevel,qindex) {
   
    var t = [];
    var x = [];
    var y = [];
    for (var i = 0, len = dataItems.length; i < len; i++) {
        t.push(dataItems[i][qindex]); // 权重值
        var tmp_grid_id = dataItems[i]["grid_id"];
        var lon_lat = tmp_grid_id.split("_");
        if (gridLevel == 5000) {
            x.push(Number(lon_lat[0]) + 0.025); // x
            y.push(Number(lon_lat[1]) + 0.025); // y
        } else if (gridLevel == 3000) {
            x.push(Number(lon_lat[0]) + 0.0125); // x
            y.push(Number(lon_lat[1]) + 0.0125); // y
        } else if (gridLevel == 1000) {
            x.push(Number(lon_lat[0]) + 0.005); // x
            y.push(Number(lon_lat[1]) + 0.005); // y
        }

    }
    var variogram = kriging.train(t, x, y, "exponential", 0, 100);

    var grid = kriging.grid(kriging_bounds, variogram, (map_extent.maxx - map_extent.minx) / (gridLevel==5000?200:gridLevel==3000?250:500));
    
    return grid;
}

console.log("webworker is loaded.");

this.onmessage = event => {
	self.postMessage(createKrigingGrid(event.data.dataItems,event.data.gridLevel,event.data.qindex));
	//self.close();
}

                                                                                                                                                                                  
self.onmessageerror = error => console.error(error)
// 向主线程发送消息