import * as React from "react";

export function renderSVG(props: any) {
    const { className } = props;

    const edge = helper(props);
    if (edge === null) {
        return null;
    }
    let line;
    let coordinateBase;
    let coordinate;

    if (edge.line !== undefined) {
        line = (
            <line
                className="react-financial-charts-cross-hair"
                stroke={edge.line.stroke}
                x1={edge.line.x1}
                y1={edge.line.y1}
                x2={edge.line.x2}
                y2={edge.line.y2}
            />
        );
    }

    if (edge.coordinate !== undefined && edge.coordinateBase !== undefined) {
        const { rectWidth, rectHeight, arrowWidth } = edge.coordinateBase;

        const path =
            edge.orient === "left"
                ? `M0,0L0,${rectHeight}L${rectWidth},${rectHeight}L${rectWidth + arrowWidth},10L${rectWidth},0L0,0L0,0`
                : `M0,${arrowWidth}L${arrowWidth},${rectHeight}L${rectWidth + arrowWidth},${rectHeight}L${
                      rectWidth + arrowWidth
                  },0L${arrowWidth},0L0,${arrowWidth}`;

        coordinateBase =
            edge.orient === "left" || edge.orient === "right" ? (
                <g transform={`translate(${edge.coordinateBase.edgeXRect},${edge.coordinateBase.edgeYRect})`}>
                    <path
                        d={path}
                        key={1}
                        className="react-financial-charts-text-background"
                        height={rectHeight}
                        width={rectWidth}
                        fill={edge.coordinateBase.fill}
                    />
                </g>
            ) : (
                <rect
                    key={1}
                    className="react-financial-charts-text-background"
                    x={edge.coordinateBase.edgeXRect}
                    y={edge.coordinateBase.edgeYRect}
                    height={rectHeight}
                    width={rectWidth}
                    fill={edge.coordinateBase.fill}
                />
            );

        coordinate = (
            <text
                key={2}
                x={edge.coordinate.edgeXText}
                y={edge.coordinate.edgeYText}
                textAnchor={edge.coordinate.textAnchor}
                fontFamily={edge.coordinate.fontFamily}
                fontSize={edge.coordinate.fontSize}
                dy=".32em"
                fill={edge.coordinate.textFill}
            >
                {edge.coordinate.displayCoordinate}
            </text>
        );
    }
    return (
        <g className={className}>
            {line}
            {coordinateBase}
            {coordinate}
        </g>
    );
}

function helper(props: any) {
    const { coordinate: displayCoordinate, show, type, orient, edgeAt, hideLine } = props;
    const { fill, fontFamily, fontSize, textFill, lineStroke, arrowWidth } = props;
    const { rectWidth, rectHeight } = props;
    const { x1, y1, x2, y2, dx } = props;

    if (!show) {
        return null;
    }

    let edgeXRect;
    let edgeYRect;
    let edgeXText;
    let edgeYText;

    if (type === "horizontal") {
        edgeXRect = dx + (orient === "right" ? edgeAt + 1 : edgeAt - rectWidth - arrowWidth - 1);
        edgeYRect = y1 - rectHeight / 2;
        edgeXText =
            dx + (orient === "right" ? edgeAt + rectWidth / 2 + arrowWidth : edgeAt - rectWidth / 2 - arrowWidth);
        edgeYText = y1;
    } else {
        edgeXRect = x1 - rectWidth / 2;
        edgeYRect = orient === "bottom" ? edgeAt : edgeAt - rectHeight;
        edgeXText = x1;
        edgeYText = orient === "bottom" ? edgeAt + rectHeight / 2 : edgeAt - rectHeight / 2;
    }
    let coordinateBase;
    let coordinate;
    const textAnchor = "middle";
    if (displayCoordinate !== undefined) {
        coordinateBase = {
            edgeXRect,
            edgeYRect,
            rectHeight,
            rectWidth,
            fill,
            arrowWidth,
        };
        coordinate = {
            edgeXText,
            edgeYText,
            textAnchor,
            fontFamily,
            fontSize,
            textFill,
            displayCoordinate,
        };
    }

    const line = hideLine
        ? undefined
        : {
              stroke: lineStroke,
              x1,
              y1,
              x2,
              y2,
          };
    return {
        coordinateBase,
        coordinate,
        line,
        orient,
    };
}

export function drawOnCanvas(ctx: CanvasRenderingContext2D, props: any) {
    const edge = helper(props);

    if (edge === null) {
        return;
    }

    if (edge.coordinate !== undefined && edge.coordinateBase !== undefined) {
        const { rectWidth, rectHeight, arrowWidth } = edge.coordinateBase;

        ctx.fillStyle = edge.coordinateBase.fill;

        const x = edge.coordinateBase.edgeXRect;
        const y = edge.coordinateBase.edgeYRect;

        ctx.beginPath();

        if (edge.orient === "right") {
            ctx.moveTo(x, y + rectHeight / 2);
            ctx.lineTo(x + arrowWidth, y);
            ctx.lineTo(x + rectWidth + arrowWidth, y);
            ctx.lineTo(x + rectWidth + arrowWidth, y + rectHeight);
            ctx.lineTo(x + arrowWidth, y + rectHeight);
            ctx.closePath();
        } else if (edge.orient === "left") {
            ctx.moveTo(x, y);
            ctx.lineTo(x + rectWidth, y);
            ctx.lineTo(x + rectWidth + arrowWidth, y + rectHeight / 2);
            ctx.lineTo(x + rectWidth, y + rectHeight);
            ctx.lineTo(x, y + rectHeight);
            ctx.closePath();
        } else {
            ctx.rect(x, y, rectWidth, rectHeight);
        }
        ctx.fill();

        ctx.font = `${edge.coordinate.fontSize}px ${edge.coordinate.fontFamily}`;
        ctx.fillStyle = edge.coordinate.textFill;
        ctx.textAlign =
            edge.coordinate.textAnchor === "middle" ? "center" : (edge.coordinate.textAnchor as CanvasTextAlign);
        ctx.textBaseline = "middle";

        ctx.fillText(edge.coordinate.displayCoordinate, edge.coordinate.edgeXText, edge.coordinate.edgeYText);
    }
    if (edge.line !== undefined) {
        ctx.strokeStyle = edge.line.stroke;

        ctx.beginPath();
        ctx.moveTo(edge.line.x1, edge.line.y1);
        ctx.lineTo(edge.line.x2, edge.line.y2);
        ctx.stroke();
    }
}