<template>
  <div
    class="dv-flyline-chart-enhanced"
    :style="`background-image: url(${mergedConfig ? mergedConfig.bgImgSrc : ''})`"
    :ref="ref"
    @click="consoleClickPos"
  >
    <svg v-if="flylines.length" :width="width" :height="height">
      <defs>
        <radialGradient
          :id="flylineGradientId"
          cx="50%" cy="50%" r="50%"
        >
          <stop
            offset="0%" stop-color="#fff"
            stop-opacity="1"
          />
          <stop
            offset="100%" stop-color="#fff"
            stop-opacity="0"
          />
        </radialGradient>

        <radialGradient
          :id="haloGradientId"
          cx="50%" cy="50%" r="50%"
        >
          <stop
            offset="0%" stop-color="#fff"
            stop-opacity="0"
          />
          <stop
            offset="100%" stop-color="#fff"
            stop-opacity="1"
          />
        </radialGradient>
      </defs>

      <!-- points -->
      <g v-for="point in flylinePoints" :key="point.key + Math.random()">
        <defs>
          <circle
            v-if="point.halo.show"
            :id="`halo${unique}${point.key}`"
            :cx="point.coordinate[0]"
            :cy="point.coordinate[1]"
          >
            <animate
              attributeName="r"
              :values="`1;${point.halo.radius}`"
              :dur="`${point.halo.time}s`"
              repeatCount="indefinite"
            />
            <animate
              attributeName="opacity"
              values="1;0"
              :dur="`${point.halo.time}s`"
              repeatCount="indefinite"
            />
          </circle>
        </defs>

        <!-- halo gradient mask -->
        <mask :id="`mask${unique}${point.key}`">
          <use
            v-if="point.halo.show"
            :xlink:href="`#halo${unique}${point.key}`"
            :fill="`url(#${haloGradientId})`"
          />
        </mask>

        <!-- point halo -->
        <use
          v-if="point.halo.show"
          :xlink:href="`#halo${unique}${point.key}`"
          :fill="point.halo.color"
          :mask="`url(#mask${unique}${point.key})`"
        />

        <!-- point icon -->
        <image
          v-if="point.icon.show"
          :xlink:href="point.icon.src"
          :width="point.icon.width"
          :height="point.icon.height"
          :x="point.icon.x"
          :y="point.icon.y"
        />

        <!-- point text -->
        <text
          v-if="point.text.show"
          :style="`fontSize:${point.text.fontSize}px;color:${point.text.color}`"
          :fill="point.text.color"
          :x="point.text.x"
          :y="point.text.y"
        >
          {{ point.name }}
        </text>
      </g>

      <!-- flylines -->
      <g v-for="(line, i) in flylines" :key="line.key + Math.random()">
        <defs>
          <path
            :id="line.key"
            :ref="line.key"
            :d="line.d"
            fill="transparent"
          />
        </defs>

        <!-- orbit line -->
        <use
          :xlink:href="`#${line.key}`"
          :stroke-width="line.width"
          :stroke="line.orbitColor"
        />

        <!-- fly line gradient mask -->
        <mask :id="`mask${unique}${line.key}`">
          <circle cx="0" cy="0" :r="line.radius" :fill="`url(#${flylineGradientId})`">
            <animateMotion
              :dur="line.time"
              :path="line.d"
              rotate="auto"
              repeatCount="indefinite"
            />
          </circle>
        </mask>

        <!-- fly line -->
        <use
          v-if="flylineLengths[i]"
          :xlink:href="`#${line.key}`"
          :stroke-width="line.width"
          :stroke="line.color"
          :mask="`url(#mask${unique}${line.key})`"
        >
          <animate
            attributeName="stroke-dasharray"
            :from="`0, ${flylineLengths[i]}`"
            :to="`${flylineLengths[i]}, 0`"
            :dur="line.time"
            repeatCount="indefinite"
          />
        </use>
      </g>
    </svg>
  </div>
</template>

<script>
import { deepMerge } from '@jiaminghi/charts/lib/util/index'

import { deepClone } from '@jiaminghi/c-render/lib/plugin/util'

import { randomExtend, getPointDistance } from '../../../util/index'

import autoResize from '../../../mixin/autoResize'

export default {
  name: 'DvFlylineChartEnhanced',
  mixins: [autoResize],
  props: {
    config: {
      type: Object,
      default: () => ({})
    },
    dev: {
      type: Boolean,
      default: false
    }
  },
  data () {
    const timestamp = Date.now()
    return {
      ref: 'dv-flyline-chart-enhanced',
      unique: Math.random(),
      flylineGradientId: `flyline-gradient-id-${timestamp}`,
      haloGradientId: `halo-gradient-id-${timestamp}`,
      /**
       * @description Type Declaration
       * 
       * interface Halo {
       *    show?: boolean
       *    duration?: [number, number]
       *    color?: string
       *    radius?: number
       * }
       * 
       * interface Text {
       *    show?: boolean
       *    offset?: [number, number]
       *    color?: string
       *    fontSize?: number
       * }
       * 
       * interface Icon {
       *    show?: boolean
       *    src?: string
       *    width?: number
       *    height?: number
       * }
       * 
       * interface Point {
       *    name: string
       *    coordinate: [number, number]
       *    halo?: Halo
       *    text?: Text
       *    icon?: Icon
       * }
       * 
       * interface Line {
       *    width?: number
       *    color?: string
       *    orbitColor?: string
       *    duration?: [number, number]
       *    radius?: string
       * }
       * 
       * interface Flyline extends Line {
       *    source: string
       *    target: string
       * }
       * 
       * interface FlylineWithPath extends Flyline {
       *    d: string
       *    path: [[number, number], [number, number], [number, number]]
       *    key: string
       * }
       */
      defaultConfig: {
        /**
         * @description Flyline chart points
         * @type {Point[]}
         * @default points = []
         */
        points: [],
        /**
         * @description Lines
         * @type {Flyline[]}
         * @default lines = []
         */
        lines: [],
        /**
         * @description Global halo configuration
         * @type {Halo}
         */
        halo: {
          /**
           * @description Whether to show halo
           * @type {Boolean}
           * @default show = false
           */
          show: false,
          /**
           * @description Halo animation duration (1s = 10)
           * @type {[number, number]}
           */
          duration: [20, 30],
          /**
           * @description Halo color
           * @type {String}
           * @default color = '#fb7293'
           */
          color: '#fb7293',
          /**
           * @description Halo radius
           * @type {Number}
           * @default radius = 120
           */
          radius: 120
        },
        /**
         * @description Global text configuration
         * @type {Text}
         */
        text: {
          /**
           * @description Whether to show text
           * @type {Boolean}
           * @default show = false
           */
          show: false,
          /**
           * @description Text offset
           * @type {[number, number]}
           * @default offset = [0, 15]
           */
          offset: [0, 15],
          /**
           * @description Text color
           * @type {String}
           * @default color = '#ffdb5c'
           */
          color: '#ffdb5c',
          /**
           * @description Text font size
           * @type {Number}
           * @default fontSize = 12
           */
          fontSize: 12
        },
        /**
         * @description Global icon configuration
         * @type {Icon}
         */
        icon: {
          /**
           * @description Whether to show icon
           * @type {Boolean}
           * @default show = false
           */
          show: false,
          /**
           * @description Icon src
           * @type {String}
           * @default src = ''
           */
          src: '',
          /**
           * @description Icon width
           * @type {Number}
           * @default width = 15
           */
          width: 15,
          /**
           * @description Icon height
           * @type {Number}
           * @default width = 15
           */
          height: 15
        },
        /**
         * @description Global line configuration
         * @type {Line}
         */
        line: {
          /**
           * @description Line width
           * @type {Number}
           * @default width = 1
           */
          width: 1,
          /**
           * @description Flyline color
           * @type {String}
           * @default color = '#ffde93'
           */
          color: '#ffde93',
          /**
           * @description Orbit color
           * @type {String}
           * @default orbitColor = 'rgba(103, 224, 227, .2)'
           */
          orbitColor: 'rgba(103, 224, 227, .2)',
          /**
           * @description Flyline animation duration
           * @type {[number, number]}
           * @default duration = [20, 30]
           */
          duration: [20, 30],
          /**
           * @description Flyline radius
           * @type {Number}
           * @default radius = 100
           */
          radius: 100
        },
        /**
         * @description Back ground image url
         * @type {String}
         * @default bgImgSrc = ''
         */
        bgImgSrc: '',
        /**
         * @description K value
         * @type {Number}
         * @default k = -0.5
         * @example k = -1 ~ 1
         */
        k: -0.5,
        /**
         * @description Flyline curvature
         * @type {Number}
         * @default curvature = 5
         */
        curvature: 5,
        /**
         * @description Relative points position
         * @type {Boolean}
         * @default relative = true
         */
        relative: true
      },
      /**
       * @description Fly line data
       * @type {FlylineWithPath[]}
       * @default flylines = []
       */
      flylines: [],
      /**
       * @description Fly line lengths
       * @type {Number[]}
       * @default flylineLengths = []
       */
      flylineLengths: [],
      /**
       * @description Fly line points
       * @default flylinePoints = []
       */
      flylinePoints: [],

      mergedConfig: null
    }
  },
  watch: {
    config () {
      const { calcData } = this

      calcData()
    }
  },
  methods: {
    afterAutoResizeMixinInit () {
      const { calcData } = this

      calcData()
    },
    onResize () {
      const { calcData } = this

      calcData()
    },
    async calcData () {
      const { mergeConfig, calcflylinePoints, calcLinePaths } = this

      mergeConfig()

      calcflylinePoints()

      calcLinePaths()

      const { calcLineLengths } = this

      await calcLineLengths()
    },
    mergeConfig () {
      let { config, defaultConfig } = this

      const mergedConfig = deepMerge(deepClone(defaultConfig, true), config || {})

      const { points, lines, halo, text, icon, line } = mergedConfig

      mergedConfig.points = points.map(item => {
        item.halo = deepMerge(deepClone(halo, true), item.halo || {})
        item.text = deepMerge(deepClone(text, true), item.text || {})
        item.icon = deepMerge(deepClone(icon, true), item.icon || {})

        return item
      })

      mergedConfig.lines = lines.map(item => {
        return deepMerge(deepClone(line, true), item)
      })

      this.mergedConfig = mergedConfig
    },
    calcflylinePoints () {
      const { mergedConfig, width, height } = this

      const { relative, points } = mergedConfig

      if (!relative) return

      this.flylinePoints = points.map((item, i) => {
        const { coordinate: [x, y], halo, icon, text } = item

        if (relative) item.coordinate = [x * width, y * height]

        item.halo.time = randomExtend(...halo.duration) / 10

        const { width: iw, height: ih } = icon
        item.icon.x = item.coordinate[0] - iw / 2
        item.icon.y = item.coordinate[1] - ih / 2

        const [ox, oy] = text.offset
        item.text.x = item.coordinate[0] + ox
        item.text.y = item.coordinate[1] + oy

        item.key = `${item.coordinate.toString()}${i}`

        return item
      })
    },
    calcLinePaths () {
      const { getPath, mergedConfig } = this

      const { points, lines } = mergedConfig

      this.flylines = lines.map(item => {
        const { source, target, duration } = item

        const sourcePoint = points.find(({ name }) => name === source).coordinate
        const targetPoint = points.find(({ name }) => name === target).coordinate

        const path = getPath(sourcePoint, targetPoint).map(item => item.map(v => parseFloat(v.toFixed(10))))
        const d = `M${path[0].toString()} Q${path[1].toString()} ${path[2].toString()}`
        const key = `path${path.toString()}`
        const time = randomExtend(...duration) / 10

        return { ...item, path, key, d, time }
      })
    },
    getPath (start, end) {
      const { getControlPoint } = this

      const controlPoint = getControlPoint(start, end)

      return [start, controlPoint, end]
    },
    getControlPoint ([sx, sy], [ex, ey]) {
      const { getKLinePointByx, mergedConfig } = this

      const { curvature, k } = mergedConfig

      const [mx, my] = [(sx + ex) / 2, (sy + ey) / 2]

      const distance = getPointDistance([sx, sy], [ex, ey])

      const targetLength = distance / curvature
      const disDived = targetLength / 2

      let [dx, dy] = [mx, my]

      do {
        dx += disDived
        dy = getKLinePointByx(k, [mx, my], dx)[1]
      } while (getPointDistance([mx, my], [dx, dy]) < targetLength)

      return [dx, dy]
    },
    getKLinePointByx (k, [lx, ly], x) {
      const y = ly - k * lx + k * x

      return [x, y]
    },
    async calcLineLengths () {
      const { $nextTick, flylines, $refs } = this

      await $nextTick()

      this.flylineLengths = flylines.map(({ key }) => $refs[key][0].getTotalLength())
    },
    consoleClickPos ({ offsetX, offsetY }) {
      const { width, height, dev } = this

      if (!dev) return

      const relativeX = (offsetX / width).toFixed(2)
      const relativeY = (offsetY / height).toFixed(2)

      console.warn(`dv-flyline-chart-enhanced DEV: \n Click Position is [${offsetX}, ${offsetY}] \n Relative Position is [${relativeX}, ${relativeY}]`)
    }
  }
}
</script>