import type {
  DrawImageOption, DrawLineOption, DrawLinePolygonOption, DrawPathContext, DrawRectOption,
  DrawTextOption,
} from './base.js'
import
{ Drawing,
} from './base.js'

const canvas = document.createElement('canvas')
const canvasCtx = canvas.getContext('2d')
export class SvgDrawing extends Drawing
{
  svg: SVGElement
  /**
   *
   */
  constructor(
    width: number | string,
    height: number | string,
        scale: number = 0.8,
  )
  {
    super()
    this.scale = scale
    this.width = Number(width)
    this.height = Number(height)
    this.svg = this.createElement('svg')
    // this.svg.setAttribute('width', this.width.toString());//(Number(width) * this.scale)
    // this.svg.setAttribute('height', this.height.toString());//(Number(height) * this.scale)
    // this.svg.style.transform = 'scale(' + this.scale + ')';
    // this.svg.style.transformOrigin = 'left top';
    this.svg.setAttribute('viewBox', `0 0 ${width} ${height}`)
  }

  private createElement(name)
  {
    return document.createElementNS('http://www.w3.org/2000/svg', name)
  }

  toHTML(): string
  {
    return this.svg.outerHTML
  }

  clearAll()
  {
    this.svg.innerHTML = ''
  }

  drawPath(path: DrawPathContext, option: DrawLineOption)
  {
    let el = this.createElement('path')

    let pathStr = ''
    for (const item of path.data)
    {
      switch (item.method)
      {
        case 'M':
          pathStr += `M ${item.args.join(' ')} `
          break
        case 'L':
          pathStr += `L ${item.args.join(' ')} `
          break
      }
    }
    el.setAttribute('d', pathStr)
    el.setAttribute('stroke-width', option.lineWidth.toString())
    el.setAttribute('stroke', option.strokeStyle)
    this.svg.appendChild(el)
  }

  drawLine(
    x0: number,
    y0: number,
    x1: number,
    y1: number,
    option: DrawLineOption,
  )
  {
    let el = this.createElement('line')
    el.setAttribute('x1', x0.toString()) // (Number(x0) * this.scale)
    el.setAttribute('y1', y0.toString()) // (Number(y0) * this.scale)
    el.setAttribute('x2', x1.toString()) // (Number(x1) * this.scale)
    el.setAttribute('y2', y1.toString()) // (Number(y1) * this.scale)
    el.setAttribute('stroke', option.strokeStyle)
    el.setAttribute('fill', 'rgba(0,0,0,0)')
    el.setAttribute('stroke-width', option.lineWidth.toString())
    this.svg.appendChild(el)
  }

  drawRect(
    x: number,
    y: number,
    width: number,
    height: number,
    option: DrawRectOption,
  )
  {
    let el = this.createElement('rect')
    el.setAttribute('x', x.toString()) // ((x + option.baseLine / 2) * this.scale)
    el.setAttribute('y', y.toString()) // ((y + option.baseLine) * this.scale)
    el.setAttribute('width', width.toString()) // (Number(width) * this.scale)
    el.setAttribute('height', height.toString()) // (Number(height) * this.scale)
    if (option.fillStyle)
    {
      el.setAttribute('fill', option.fillStyle)
      el.setAttribute('stroke', option.strokeStyle)
    } else
    {
      el.setAttribute('fill', 'rgba(1,1,1,0)')
      el.setAttribute('stroke', option.strokeStyle)
      el.setAttribute(
        'stroke-width',
        (Math.floor(option.lineWidth) + 0.5).toString(),
      )
    }
    this.svg.appendChild(el)
  }

  drawText(text: string, x: number, y: number, option: DrawTextOption)
  {
    let el = this.createElement('text')
    el.setAttribute('x', x.toString()) // (Number(x) * this.scale)  option['CncDict'] ? (x - Number(option.fontSize) / 6).toString() :
    el.setAttribute('y', y.toString()) // (Number(y) * this.scale)
    el.style.dominantBaseline = 'text-before-edge'
    if (option.resetFont)
    {
      el.style.dominantBaseline = 'middle'
      el.setAttribute('text-anchor', 'middle')
    }
    el.setAttribute('fill', option.fillStyle)
    el.setAttribute('font-size', `${option.fontSize}px`)
    el.setAttribute('font-weight', option.fontWeight)
    el.setAttribute('font-family', option.fontFamily)
    if (option.overflowText)
    {
      el.setAttribute('textLength', option.maxWidth.toString())
      el.setAttribute('lengthAdjust', 'spacingAndGlyphs')
    }
    el.setAttribute('alignment-baseline', option.textBaseline)
    switch (option.textAlign)
    {
      case 'start':
        el.setAttribute('text-anchor', 'left')
        break
      case 'center':
        el.setAttribute('text-anchor', 'middle')
        break
      case 'right':
        el.setAttribute('text-anchor', 'end')
        break
    }

    if (typeof text === 'string')
    {
      el.innerHTML = text.replaceAll('&', '&amp;').replaceAll('<', '&lt;').replaceAll('>', '&gt;')
    } else
    {
      el.innerHTML = text
    }

    this.svg.appendChild(el)
  }

  drawForeignObjectText(
    text: string,
    x: number,
    y: number,
    option: DrawTextOption,
  )
  {
    //   let el = this.createElement('foreignObject');
    //   el.setAttribute('x',x.toString());
    //   el.setAttribute('y',y.toString());
    //   el.setAttribute('width',option.maxWidth.toString());
    //   el.setAttribute('height',option['maxHeight'].toString());
    //   let span = this.createElement('span');
    //   span.style.dominantBaseline = 'text-before-edge';
    //   if(option['resetFont']){
    //     span.style.dominantBaseline = 'middle';
    //     span.style.textAnchor = 'middle';
    //   }
    //   span.style.fontSize = option.fontSize + 'px';
    //   span.style.fontWeight = option.fontWeight;
    //   span.style.fontFamily = option.fontFamily;
    //   span.style.display = 'inline-block';
    //   span.style.width = option.maxWidth + 'px';
    //   span.style.height = option['maxHeight'] + 'px';
    //   span.style.overflow = 'hidden';
    //   span.innerHTML = text;
    //   el.appendChild(span);
    //   this.svg.appendChild(el);
  }

  async drawImage(
    source: CanvasImageSource,
    x: number,
    y: number,
    width: number,
    height: number,
    option: DrawImageOption,
  )
  {
    let src = ''
    if (source instanceof ImageBitmap)
    {
      canvas.width = source.width
      canvas.height = source.height
      canvasCtx.clearRect(0, 0, source.width, source.height)
      canvasCtx.drawImage(source, 0, 0, source.width, source.height)
      src = canvas.toDataURL()
    } else if (source instanceof HTMLImageElement)
    {
      src = source.src
    }
    return new Promise((resolve, reject) =>
    {
      let el = this.createElement('image')
      el.setAttribute('x', x.toString()) // (Number(x) * this.scale)
      el.setAttribute('y', y.toString()) // (Number(y) * this.scale)
      el.setAttribute('width', width.toString()) // (Number(width) * this.scale)
      el.setAttribute('height', height.toString()) // (Number(height) * this.scale)
      el.setAttribute('xlink:href', src)
      el.setAttribute('preserveAspectRatio', 'none meet')
      this.svg.appendChild(el)
      resolve(null)
    })
  }

  drawLinePolygon(points: Array<any>, option: DrawLinePolygonOption)
  {
    let el = this.createElement('polygon')
    let pointsStr = ''
    for (let i = 0; i < points.length; i++)
    {
      if (i == points.length - 1)
      {
        pointsStr += `${points[i].x} ${points[i].y}`
      } else
      {
        pointsStr += `${points[i].x} ${points[i].y},`
      }
    }
    el.setAttribute('points', pointsStr)
    el.setAttribute('fill', option.isFill ? option.fillStyle : 'none')
    el.setAttribute('stroke', option.strokeStyle)
    el.setAttribute('stroke-width', option.lineWidth.toString())// 添加多段线的线宽--xyh
    this.svg.appendChild(el)
  }
}