//本文档是图形输出的接口实现

const JpcFigureOutput = {
    offsetX: 0,
    offsetY: 0,
    scaleFactor: 1,
	_iniCavas: function(canvas, width, height) {
		if (canvas) {
			let ctx = canvas.getContext('2d');
		}
	},
	_draw: function(ctx, figure, saveAsData = false, pageIdx = 1) {
		if (figure.imageData) {
			//直接图形输出
            ctx.putImageData(figure.imageData, figure.area.Left + this.offsetX, figure.area.Top + this.offsetY);
		} else {
			let width = figure.area.Right - figure.area.Left;
			let height = figure.area.Bottom - figure.area.Top;
			let xSteps = figure.coordinateAxis.axisX.steps;
			let ySteps = figure.coordinateAxis.axisY.steps;
			let xStepW = width / xSteps;
			let yStepH = height / ySteps;
			ctx.save();
            ctx.translate(0.5,0.5);
            ctx.beginPath();
            if (figure.coordinateAxis.axisX.isShowLine) {
                //画竖线
                for (let idx = 0; idx < xSteps; idx++) {
                    ctx.lineWidth = 1;
                    ctx.strokeStyle = 'black';
                    ctx.moveTo(Math.round(figure.area.Left + xStepW * (idx + 1) + this.offsetX), figure.area.Bottom + this.offsetY);
                    ctx.lineTo(Math.round(figure.area.Left + xStepW * (idx + 1) + this.offsetX), figure.area.Top + this.offsetY);
                }
            }
            if (figure.coordinateAxis.axisY.isShowLine) {
                //画横线
                for (let idx = 0; idx < ySteps; idx++) {
                    ctx.lineWidth = 1;
                    ctx.strokeStyle = 'black';
                    ctx.moveTo(figure.area.Left + this.offsetX, Math.round(figure.area.Bottom - yStepH * (idx + 1) + this.offsetY));
                    ctx.lineTo(figure.area.Right + this.offsetX, Math.round(figure.area.Bottom - yStepH * (idx + 1) + this.offsetY));
                }
            }
            ctx.stroke();
            for (let ctIdx = 0; ctIdx < figure.contents.length; ctIdx++) {
				const content = figure.contents[ctIdx];
				ctx.beginPath();
                let firstDraw = true;
                if (pageIdx === 1 && figure.config.adhocStartPoint) {
                    ctx.moveTo(figure.area.Left + this.offsetX, figure.area.Bottom + this.offsetY);
                    firstDraw = false;
                }
                for (let idx = 0; idx < content.values.length; idx++) {
                    if (content.values[idx] !== null && content.values[idx] !== undefined) {
                        let xPos = figure.area.Left + xStepW * idx + xStepW / 2 + this.offsetX;
                        let yPos = figure.area.Bottom - (content.values[idx] / content.maxValue) * height + this.offsetY;
                        ctx.lineWidth = 1;
                        ctx.strokeStyle = content.color;
                        if (content.style === 'dash') ctx.setLineDash([10, 5]);
                        switch (figure.config.dispType) {
                            case 'line':
                                //折线图
                                if (firstDraw) {
                                    ctx.moveTo(xPos, yPos);
                                    firstDraw = false;
                                } else {
                                    ctx.lineTo(xPos, yPos);
                                    firstDraw = false;
                                }
                            break;
                            case 'pole':
                                //柱图
                            break;
                            default:
                                //....
                            break;
                        }
                    }
				}
				ctx.stroke();
			}
			ctx.restore();
            if (saveAsData) {
                //保存当前图形数据
                figure.imageData = ctx.getImageData(figure.area.Left + this.offsetX, figure.area.Top + this.offsetY, width, height);
            }
		}
	},
	drawToCanvas: function(canvas, currentPageData, pageIdx = 1) {
		//预览用
		if (canvas && currentPageData) {
			const ctx = canvas.getContext("2d");
			if (currentPageData.figure_cells && currentPageData.figure_cells.length > 0) {
				for (let figure of currentPageData.figure_cells) {
					this._draw(ctx, figure, false, pageIdx);
				}
			}
		}
	},
    _drawPdf: function(doc, figure, pageIdx = 1) {
        const PDF_SCALE = 0.75;
        if (figure.imageData) {
			//直接图形输出
		} else {
			let width = figure.area.Right - figure.area.Left;
			let height = figure.area.Bottom - figure.area.Top;
			let xSteps = figure.coordinateAxis.axisX.steps;
			let ySteps = figure.coordinateAxis.axisY.steps;
			let xStepW = width / xSteps;
			let yStepH = height / ySteps;

            if (figure.coordinateAxis.axisX.isShowLine) {
                //画竖线
                for (let idx = 0; idx < xSteps; idx++) {
                    doc.setLineWidth(0.8);
                    doc.setDrawColor('black');
                    doc.line((Math.round(figure.area.Left + xStepW * (idx + 1) + this.offsetX)) * PDF_SCALE, (figure.area.Bottom + this.offsetY) * PDF_SCALE,
                             (Math.round(figure.area.Left + xStepW * (idx + 1) + this.offsetX)) * PDF_SCALE, (figure.area.Top + this.offsetY) * PDF_SCALE);
                }
            }
            if (figure.coordinateAxis.axisY.isShowLine) {
                //画横线
                for (let idx = 0; idx < ySteps; idx++) {
                    doc.setLineWidth(0.8);
                    doc.setDrawColor('black');
                    doc.line((figure.area.Left + this.offsetX) * PDF_SCALE, (Math.round(figure.area.Bottom - yStepH * (idx + 1) + this.offsetY)) * PDF_SCALE,
                            (figure.area.Right + this.offsetX) * PDF_SCALE, (Math.round(figure.area.Bottom - yStepH * (idx + 1) + this.offsetY)) * PDF_SCALE);
                }
            }

            for (let ctIdx = 0; ctIdx < figure.contents.length; ctIdx++) {
				const content = figure.contents[ctIdx];
                let preXPos = 0, preYPos = 0;
                let firstDraw = true;
                for (let idx = 0; idx < content.values.length; idx++) {
                    if (content.values[idx] !== null && content.values[idx] !== undefined) {
                        let xPos = figure.area.Left + xStepW * idx + xStepW / 2 + this.offsetX;
                        let yPos = figure.area.Bottom - (content.values[idx] / content.maxValue) * height + this.offsetY;
                        doc.setLineWidth(0.8);
                        doc.setDrawColor(content.color);
                        if (content.style === 'dash') doc.setLineDash([10, 5]);
                        switch (figure.config.dispType) {
                            case 'line':
                                //折线图
                                if (!firstDraw) {
                                    // ctx.lineTo(xPos, yPos);
                                    doc.line(preXPos * PDF_SCALE, preYPos * PDF_SCALE, xPos * PDF_SCALE, yPos * PDF_SCALE);
                                } else if (pageIdx === 1 && figure.config.adhocStartPoint) {
                                    doc.line((figure.area.Left + this.offsetX) * PDF_SCALE, (figure.area.Bottom + this.offsetY) * PDF_SCALE, 
                                    xPos * PDF_SCALE, yPos * PDF_SCALE);
                                }
                                preXPos = xPos;
                                preYPos = yPos;
                                firstDraw = false;
                            break;
                            case 'pole':
                                //柱图
                            break;
                            default:
                                //....
                            break;
                        }                        
                    }
				}
			}
		}
    },
	drawToPdf: function(doc, currentPageData, pageIdx = 1) {
		//导出PDF用
		if (doc && currentPageData) {
			if (currentPageData.figure_cells && currentPageData.figure_cells.length > 0) {
				for (let figure of currentPageData.figure_cells) {
					this._drawPdf(doc, figure, pageIdx);
				}
			}
		}
	},
    _drawSvg: function(figure, isHtoV, actArea, pageIdx = 1) {
        let rst = [];
        if (figure.imageData) {
			//直接图形输出
		} else {
			let width = figure.area.Right - figure.area.Left;
			let height = figure.area.Bottom - figure.area.Top;
			let xSteps = figure.coordinateAxis.axisX.steps;
			let ySteps = figure.coordinateAxis.axisY.steps;
			let xStepW = width / xSteps;
			let yStepH = height / ySteps;
            let HtoVStr = "";
            if (isHtoV) {
                //引用了padding后，top坐标不用考虑offset了
                HtoVStr = ` transform="translate(${(actArea.Bottom - actArea.Top + 2)},0) rotate(90)"`;
            }
            if (figure.coordinateAxis.axisX.isShowLine) {
                //画竖线
                for (let idx = 0; idx < xSteps; idx++) {
                    rst.push("<line x1='" + Math.round(figure.area.Left + xStepW * (idx + 1) + this.offsetX) + "' y1='" + (figure.area.Bottom + this.offsetY) +
                            "' x2='" + Math.round(figure.area.Left + xStepW * (idx + 1) + this.offsetX) + "' y2='" + (figure.area.Top + this.offsetY) +
                            "' style='stroke:rgb(0,0,0);stroke-width:1'" + HtoVStr + "/>")
                }
            }
            if (figure.coordinateAxis.axisY.isShowLine) {
                //画横线
                for (let idx = 0; idx < ySteps; idx++) {
                    rst.push("<line x1='" + (figure.area.Left + this.offsetX) + "' y1='" + Math.round(figure.area.Bottom - yStepH * (idx + 1) + this.offsetY) +
                            "' x2='" + (figure.area.Right + this.offsetX) + "' y2='" + Math.round(figure.area.Bottom - yStepH * (idx + 1) + this.offsetY) +
                            "' style='stroke:rgb(0,0,0);stroke-width:1'" + HtoVStr + "/>")
                }
            }
            for (let ctIdx = 0; ctIdx < figure.contents.length; ctIdx++) {
				const content = figure.contents[ctIdx];
                let pointStr = '';
                let stroke_dasharray = '';
                // ctx.strokeStyle = content.color;
                if (content.style === 'dash') stroke_dasharray = `10 5`;
                for (let idx = 0; idx < content.values.length; idx++) {
                    if (content.values[idx] !== null && content.values[idx] !== undefined) {
                        let xPos = figure.area.Left + xStepW * idx + xStepW / 2 + this.offsetX;
                        let yPos = figure.area.Bottom - (content.values[idx] / content.maxValue) * height + this.offsetY;
                        if (idx > 0) pointStr = pointStr + ',';
                        pointStr = pointStr + `${xPos},${yPos}`;
                        switch (figure.config.dispType) {
                            case 'line':
                                //折线图
                                if (idx === content.values.length - 1) {
                                    if (pageIdx === 1 && figure.config.adhocStartPoint) {
                                        pointStr = `${figure.area.Left + this.offsetX},${figure.area.Bottom + this.offsetY},` + pointStr;
                                    }
                                    // ctx.moveTo(xPos, yPos);
                                    rst.push("<polyline points='" + pointStr +
                                            "' style='fill:none;stroke:" + content.color + ";stroke-width:1;stroke-dasharray:" + stroke_dasharray + "'" + HtoVStr + "/>")
                                }
                            break;
                            case 'pole':
                                //柱图
                            break;
                            default:
                                //....
                            break;
                        }
                    }
				}
			}
		}
        return rst;
    },
	toSvgData: function(currentPageData, isHtoV, actArea, pageIdx = 1) {
		//打印用
        let rst = [];
		if (currentPageData) {
			if (currentPageData.figure_cells && currentPageData.figure_cells.length > 0) {
				for (let figure of currentPageData.figure_cells) {
					rst = rst.concat(this._drawSvg(figure, isHtoV, actArea, pageIdx));
				}
			}
		}
        return rst;
	},
	toImageData: function(canvas, pageData) {
		//导出Excel用
		if (canvas && pageData) {
			const ctx = canvas.getContext("2d");
            for (let currentPageData of pageData.items) {
                if (currentPageData.figure_cells && currentPageData.figure_cells.length > 0) {
                    for (let fIdx = 0; fIdx < currentPageData.figure_cells.length; fIdx++) {
                        this._draw(ctx, currentPageData.figure_cells[fIdx], true);
                        // if (fIdx === currentPageData.figure_cells.length - 1) {
                        //     this._draw(ctx, currentPageData.figure_cells[fIdx], true);
                        // } else {
                        //     this._draw(ctx, currentPageData.figure_cells[fIdx], false);
                        // }
                    }
                }
            }
		}
	},
    getBase64: function(canvas, currentPageData) {
        let rst = null;
        if (canvas && currentPageData) {
            const ctx = canvas.getContext("2d");
            if (currentPageData.figure_cells && currentPageData.figure_cells.length > 0) {
                for (let fIdx = 0; fIdx < currentPageData.figure_cells.length - 1; fIdx++) {
                    if (fIdx === currentPageData.figure_cells.length - 1) {
                        canvas.width = figure.area.Right - figure.area.Left;
                        canvas.height = figure.area.Bottom - figure.area.Top;
                        ctx.putImageData(figure.imageData, 0, 0);
                        rst = canvas.toDataURL();
                    }
                }
            }
        }
        return rst;
    },
};