/**
 * 全息镭射卡预览组合式函数
 *
 * 集成 WebGL HolographicEngine + 陀螺仪/触摸交互
 * 与现有 useLenticularPreview / useLenticularStudioTilt 架构保持一致
 */
import { ref, reactive, onMounted, onUnmounted } from 'vue'

function clamp(v, min, max) { return Math.max(min, Math.min(max, v)) }
function lerp(a, b, t) { return a + (b - a) * t }

export function useHolographicPreview() {
  const physics = reactive({
    tiltSensitivity: 72,
    transitionSmoothness: 66,
    angleStability: 88,
    sensorDeadzoneStrength: 1,
    gyroSimEnabled: true,
  })
  const viewAngle = reactive({ x: 0, y: 0, z: 0 })
  const gyroSource = ref('simulation')
  const isWebGLReady = ref(false)
  const hasWebGLError = ref(false)
  const fps = ref(0)

  let accelHandler = null
  let accelSmoothed = 0
  let accelBaselineReady = false
  let accelBaseX = 0
  let accelBaseY = 0

  function simulate(x, y) {
    viewAngle.x = clamp(x, -1, 1)
    viewAngle.y = clamp(y != null ? y : 0, -1, 1)
    viewAngle.z = Math.sqrt(viewAngle.x * viewAngle.x + viewAngle.y * viewAngle.y) * 0.5
  }

  function relax(factor = 0.85) {
    viewAngle.x *= factor
    viewAngle.y *= factor
    viewAngle.z *= factor
  }

  function startGyro() {
    gyroSource.value = 'simulation'
    if (typeof DeviceOrientationEvent === 'undefined') return

    if (typeof DeviceOrientationEvent.requestPermission === 'function') {
      gyroSource.value = 'deviceorientation-requesting'
      DeviceOrientationEvent.requestPermission()
        .then(state => { if (state === 'granted') startDeviceOrientation() })
        .catch(() => { gyroSource.value = 'simulation' })
    } else {
      startDeviceOrientation()
    }
  }

  function startDeviceOrientation() {
    gyroSource.value = 'deviceorientation'
    const handler = (e) => {
      if (e.gamma == null || e.beta == null) return
      const gamma = e.gamma || 0
      const beta = e.beta || 0
      if (!accelBaselineReady) {
        accelBaseX = lerp(accelBaseX, gamma, 0.08)
        accelBaseY = lerp(accelBaseY, beta, 0.08)
        if (Math.abs(accelBaseX - gamma) < 0.3 && Math.abs(accelBaseY - beta) < 0.3) {
          accelBaselineReady = true
        }
        return
      }
      const stab = clamp(physics.angleStability / 100, 0, 1)
      const sens = physics.tiltSensitivity / 100
      const k = 0.02 + (1 - stab) * 0.08
      const dx = (gamma - accelBaseX) / 45 * sens
      const dy = (beta - accelBaseY) / 45 * sens
      accelSmoothed = lerp(accelSmoothed, dx, k)
      const dead = physics.sensorDeadzoneStrength || 1
      const db = 0.016 * dead
      simulate(
        Math.abs(accelSmoothed) < db ? 0 : clamp(accelSmoothed, -1, 1),
        clamp(dy, -1, 1)
      )
    }
    window.addEventListener('deviceorientation', handler, true)
    accelHandler = handler
  }

  function stopGyro() {
    if (accelHandler) {
      window.removeEventListener('deviceorientation', accelHandler, true)
      accelHandler = null
    }
    gyroSource.value = 'simulation'
    accelBaselineReady = false
  }

  function onWebGLReady() { isWebGLReady.value = true; hasWebGLError.value = false }
  function onWebGLError() { hasWebGLError.value = true; isWebGLReady.value = false }
  function onFPSUpdate(v) { fps.value = v }

  onMounted(() => {
    if (physics.gyroSimEnabled) setTimeout(startGyro, 600)
  })
  onUnmounted(() => { stopGyro() })

  return {
    physics, viewAngle, gyroSource,
    isWebGLReady, hasWebGLError, fps,
    simulate, relax, startGyro, stopGyro,
    onWebGLReady, onWebGLError, onFPSUpdate,
  }
}

export function detectPerformanceTier() {
  const mem = navigator.deviceMemory || 4
  const cores = navigator.hardwareConcurrency || 4
  if (mem <= 2 || cores <= 2) return 'low'
  if (mem <= 4 || cores <= 4) return 'mid'
  return 'high'
}

export const HOLO_PERFORMANCE_PRESETS = {
  high: {
    effectIntensity: 0.85, dispersionStrength: 1.0, diffractionScale: 0.7,
    highlightSpeed: 0.8, highlightWidth: 1.0, fresnelPower: 3.5,
    noiseScale: 1.0, noiseOctaves: 6,
    safeZoneRadius: 0.35, safeZoneSoftness: 0.15,
  },
  mid: {
    effectIntensity: 0.75, dispersionStrength: 0.8, diffractionScale: 0.55,
    highlightSpeed: 0.7, highlightWidth: 1.1, fresnelPower: 3.0,
    noiseScale: 0.8, noiseOctaves: 4,
    safeZoneRadius: 0.35, safeZoneSoftness: 0.15,
  },
  low: {
    effectIntensity: 0.6, dispersionStrength: 0.5, diffractionScale: 0.35,
    highlightSpeed: 0.5, highlightWidth: 1.3, fresnelPower: 2.5,
    noiseScale: 0.55, noiseOctaves: 3,
    safeZoneRadius: 0.38, safeZoneSoftness: 0.18,
  },
}