/**
 * 动画服务类
 */
import type { Map } from 'ol'

import { Vector as VectorLayer } from 'ol/layer'
import { Vector as VectorSource } from 'ol/source'
import { Feature } from 'ol'
import { Point } from 'ol/geom'
import { Style, Circle, Fill, Stroke } from 'ol/style'
import { fromLonLat } from 'ol/proj'
import type { MarkerData } from '../types/map.types'

import { ANIMATION_CONFIG } from '../constants/map.constants'

export class AnimationService {
  private rippleLayer: VectorLayer<VectorSource> | null = null

  private animationTimer: number | null = null
  private map: Map | null = null
  constructor(map: Map) {
    this.map = map
    this.createRippleLayer()
  }
  private transparentFill: Fill = new Fill({
    color: 'transparent'
  })
  /**
   * 创建波纹图层
   */
  private createRippleLayer() {
    const source = new VectorSource()

    this.rippleLayer = new VectorLayer({
      source: source,
      zIndex: 1,
      style: (feature) => {
        const startTime = feature.get('animationStart')
        const color = feature.get('rippleColor')
        const elapsed = (Date.now() - startTime) / 1000 // 秒

        // 创建多个波纹圈
        const styles: Style[] = []

        for (let i = 0; i < ANIMATION_CONFIG.rippleCount; i++) {
          const phase = (elapsed + i * ANIMATION_CONFIG.phaseOffset) % ANIMATION_CONFIG.duration
          const progress = phase / ANIMATION_CONFIG.duration // 0-1的进度

          // 使用缓动函数使动画更平滑
          const easeProgress = 1 - Math.pow(1 - progress, 3) // ease-out cubic

          // 计算半径和透明度
          const radius =
            ANIMATION_CONFIG.minRadius +
            easeProgress * (ANIMATION_CONFIG.maxRadius - ANIMATION_CONFIG.minRadius)
          const opacity = Math.max(0, 1 - easeProgress) // 1到0的透明度

          if (opacity > ANIMATION_CONFIG.minOpacity) {
            // 计算颜色透明度
            const alpha = Math.floor(opacity * 255)
              .toString(16)
              .padStart(2, '0')
            const strokeColor = color + alpha

            styles.push(
              new Style({
                image: new Circle({
                  radius: radius,
                  fill: this.transparentFill,
                  stroke: new Stroke({
                    color: strokeColor,
                    width: Math.max(1, 3 - i * 0.4) // 动态调整线宽
                  })
                })
              })
            )
          }
        }

        return styles
      }
    })
    if (this.map) {
      this.map?.addLayer(this.rippleLayer)
    }
  }

  clear() {
    const source = this.rippleLayer?.getSource()
    source?.clear(true)
  }

  addAll(markers: MarkerData[]) {
    this.clear()
    const source = this.rippleLayer?.getSource()

    const features: Feature[] = []

    // 为每个标记添加波纹效果
    markers.forEach((marker) => {
      const feature = new Feature({
        geometry: new Point(fromLonLat(marker.coordinates)),
        markerData: marker
      })

      // 设置动画开始时间
      feature.set('animationStart', Date.now())
      feature.set('rippleColor', marker.statusColor)
      features.push(feature)
    })
    source?.addFeatures(features)
  }

  show() {
    this.rippleLayer?.setVisible(true)
    this.startAnimation()
  }
  hide() {
    this.stopAnimation()
    this.rippleLayer?.setVisible(false)
  }
  /**
   * 启动波纹动画
   */
  startAnimation(): void {
    let lastUpdateTime = 0
    const frameInterval = 1000 / ANIMATION_CONFIG.targetFPS // 帧间隔

    const animateRipples = (currentTime: number) => {
      if (this.rippleLayer && currentTime - lastUpdateTime >= frameInterval) {
        this.rippleLayer.getSource()?.changed()
        lastUpdateTime = currentTime
      }
      this.animationTimer = requestAnimationFrame(animateRipples)
    }
    animateRipples(0)
  }

  /**
   * 停止波纹动画
   */
  stopAnimation(): void {
    if (this.animationTimer) {
      cancelAnimationFrame(this.animationTimer)
      this.animationTimer = null
    }
  }

  /**
   * 销毁动画服务
   */
  destroy(): void {
    this.stopAnimation()

    if (this.rippleLayer && this.map) {
      this.map?.removeLayer(this.rippleLayer)
    }

    this.rippleLayer = null
    this.map = null
  }
}