import { SpectrumRenderer, buildSpectrumPalette, hslToHex, rgbaFromHex } from './SpectrumRenderer'

/**
 * 圆形频谱渲染器
 * 环形排列的放射线，缓慢旋转，彩虹色环效果
 */
export class CircleSpectrumRenderer implements SpectrumRenderer {
  private rotation: number = 0

  render(ctx: CanvasRenderingContext2D, bands: number[], energy: number,
    width: number, height: number, brandColor: string): void {
    const bandCount: number = bands.length
    if (bandCount === 0) return

    ctx.fillStyle = 'rgba(0, 0, 0, 0.20)'
    ctx.fillRect(0, 0, width, height)

    const centerX: number = width / 2
    const centerY: number = height / 2
    const innerRadius: number = Math.min(width, height) * 0.08
    const maxOuterRadius: number = Math.min(width, height) * 0.48
    const palette = buildSpectrumPalette(brandColor)

    // 旋转速度随能量变化 (0.5x ~ 1.5x)
    const rotationSpeed: number = 0.5 + energy * 1.0
    this.rotation += rotationSpeed * 0.02 // ~10s 一圈基础速度
    if (this.rotation > Math.PI * 2) {
      this.rotation -= Math.PI * 2
    }

    const angleStep: number = (Math.PI * 2) / bandCount

    // 中央光晕
    const coreGradient: CanvasGradient = ctx.createRadialGradient(centerX, centerY, 0, centerX, centerY, maxOuterRadius * 0.7)
    coreGradient.addColorStop(0, rgbaFromHex(hslToHex(palette.primaryHue, 0.9, 0.55), 0.28 + energy * 0.25))
    coreGradient.addColorStop(1, 'rgba(0, 0, 0, 0)')
    ctx.fillStyle = coreGradient
    ctx.beginPath()
    ctx.arc(centerX, centerY, maxOuterRadius * 0.7, 0, Math.PI * 2)
    ctx.fill()

    for (let i = 0; i < bandCount; i++) {
      const angle: number = i * angleStep + this.rotation
      const lineLength: number = innerRadius + Math.pow(bands[i], 0.85) * (maxOuterRadius - innerRadius)

      const x1: number = centerX + Math.cos(angle) * innerRadius
      const y1: number = centerY + Math.sin(angle) * innerRadius
      const x2: number = centerX + Math.cos(angle) * lineLength
      const y2: number = centerY + Math.sin(angle) * lineLength

      // 品牌色驱动的色相映射
      const hue: number = (palette.primaryHue + (i / bandCount) * 220) % 360
      const lightness: number = 0.4 + bands[i] * 0.3
      const lineColor: string = hslToHex(hue, 0.85, lightness)

      ctx.beginPath()
      ctx.strokeStyle = rgbaFromHex(lineColor, 0.76)
      ctx.lineWidth = 1 + bands[i] * 2.6
      ctx.moveTo(x1, y1)
      ctx.lineTo(x2, y2)
      ctx.stroke()
    }

    // 外环脉冲
    const pulseRadius: number = innerRadius + (maxOuterRadius - innerRadius) * (0.35 + energy * 0.55)
    ctx.beginPath()
    ctx.arc(centerX, centerY, pulseRadius, 0, Math.PI * 2)
    ctx.strokeStyle = rgbaFromHex(hslToHex(palette.complementaryHue, 0.85, 0.62), 0.35)
    ctx.lineWidth = 2
    ctx.stroke()

    // 中心圆（能量呼吸）
    const breathRadius: number = innerRadius * (0.9 + energy * 0.8)
    ctx.beginPath()
    ctx.arc(centerX, centerY, breathRadius, 0, Math.PI * 2)
    ctx.fillStyle = rgbaFromHex(hslToHex(palette.coolHue, 0.7, 0.6), 0.18 + energy * 0.24)
    ctx.fill()
  }

  reset(): void {
    this.rotation = 0
  }
}