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

export class CanvasDrawing extends Drawing {
  canvas: HTMLCanvasElement
  ctx: CanvasRenderingContext2D
  // isCaching: boolean;
  outputType: string = 'png'
  orgWidth: number
  orgHeight: number
  toHTML(): string {
    let img = new Image(this.canvas.width, this.canvas.height)
    img.src = this.canvas.toDataURL(`image/${this.outputType}`)
    return img.outerHTML
  }

  clearAll() {
    this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height)
  }

  /**
   *
   */
  constructor(
    canvas: HTMLCanvasElement,
    // isCaching: boolean = false,
  ) {
    super()
    this.canvas = canvas
    this.width = this.orgWidth = canvas.width = canvas.width
    this.height = this.orgHeight = canvas.height = canvas.height
    // this.isCaching = isCaching;
    this.ctx = this.canvas.getContext('2d')
  }

  drawPath(path: DrawPathContext, option: DrawLineOption) {
    this.ctx.beginPath()
    for (const item of path.data) {
      switch (item.method) {
        case 'M':
          this.ctx.moveTo(item.args[0], item.args[1])
          break
        case 'L':
          this.ctx.lineTo(item.args[0], item.args[1])
          break
      }
    }
    this.ctx.lineWidth = option.lineWidth
    this.ctx.strokeStyle = option.strokeStyle
    this.ctx.stroke()
  }

  drawLine(
    x0: number,
    y0: number,
    x1: number,
    y1: number,
    option: DrawLineOption,
  ) {
    this.ctx.lineWidth = option.lineWidth
    this.ctx.strokeStyle = option.strokeStyle
    this.ctx.beginPath()
    this.ctx.moveTo(x0, y0)
    this.ctx.lineTo(x1, y1)
    this.ctx.stroke()
  }

  drawRect(
    x: number,
    y: number,
    width: number,
    height: number,
    option: DrawRectOption,
  ) {
    this.ctx.lineWidth = option.lineWidth
    this.ctx.strokeStyle = option.strokeStyle
    this.ctx.fillStyle = option.fillStyle
    if (option.fillStyle) {
      this.ctx.fillRect(x, y, width, height)
    } else {
      this.ctx.strokeRect(x, y, width, height)
    }
  }

  drawText(text: string, x: number, y: number, option: DrawTextOption) {
    this.ctx.textAlign = option.textAlign as CanvasTextAlign
    this.ctx.textBaseline = option.textBaseline as CanvasTextBaseline
    this.ctx.fillStyle = option.fillStyle
    this.ctx.font
      = `${option.fontWeight} ${option.fontSize}px ${option.fontFamily}`
    this.ctx.fillText(text, x, y, option.maxWidth)
  }

  drawForeignObjectText(
    text: string,
    x: number,
    y: number,
    option: DrawTextOption,
  ) {}

  imageCache: Map<string, HTMLImageElement> = new Map()
  drawImage(
    source: CanvasImageSource,
    x: number,
    y: number,
    width: number,
    height: number,
    option: DrawImageOption,
    border: number,
  ) {
    return new Promise((resolve, reject) => {
      this.ctx.drawImage(source, x + border, y + border, width, height)
      resolve(null)
    })
  }

  drawLinePolygon(points: Array<any>, option: DrawLinePolygonOption) {
    this.ctx.beginPath()
    this.ctx.moveTo(points[0].x, points[0].y)
    for (let i = 1; i < points.length; i++) {
      this.ctx.lineTo(points[i].x, points[i].y)
    }
    this.ctx.closePath()

    this.ctx.stroke()
    if (option.isFill)
    {
      this.ctx.fillStyle = option.fillStyle
      this.ctx.fill()
    }
  }

  setScale(value: number) {
    this.scale = value
    this.canvas.width = this.width = this.orgWidth * value
    this.canvas.height = this.height = this.orgHeight * value
    this.ctx.scale(value, value)
  }
  // resize(width: number, height: number)
  // {
  //     let oldWidth = this.width;
  //     let oldHeight = this.height;
  //     if (oldWidth != width || oldHeight != height)
  //     {
  //         let newCanvas = document.createElement('canvas');
  //         this.width = newCanvas.width = width;
  //         this.height = newCanvas.height = height;
  //         let newCtx = newCanvas.getContext('2d');
  //         newCtx.drawImage(this.canvas, 0, 0, oldWidth, oldHeight, 0, 0, width, height);
  //         this.canvas = newCanvas;
  //         this.ctx = newCtx;
  //     }
  // }

  exportFile(nameOrType: string, param: string): Promise<Blob | Uint8Array> {
    let mimeType = 'image/png'
    let ext = getFileExt(nameOrType)
    if (ext === null) {
      ext = nameOrType
    }
    let paramDic: { [key: string]: string } = {}
    if (param != null) {
      for (const item of param.split('&')) {
        let kv = item.split('=')
        paramDic[kv[0]] = kv[1]
      }
    }
    switch (ext) {
      case 'bmp':
        let data = createBmpFile(
          this.ctx.getImageData(0, 0, this.width, this.height),
          paramDic,
        )
        return Promise.resolve(new Uint8Array(data))
      case 'jpg':
      case 'jpeg':
        mimeType = 'image/jpeg'
        break
    }
    return new Promise<Blob>((resolve) => {
      this.canvas.toBlob((data: Blob) => {
        resolve(data)
      }, mimeType)
    })
  }
}