import { computed, markRaw, onBeforeUnmount, onMounted, reactive, ref, watch, watchEffect } from 'vue'
import { Texture } from 'pixi.js'
import { useParticleStore } from '../../store/particleStore'
import type { ParticleSystem } from '../../store/particleStore'
import { defaultConfig, ensureEmitterConfig } from '../../core/particleEmitter'
import NumSlider from '../NumSlider.vue'
import CurveEditor from '../CurveEditor.vue'
import ParticleAttributeControl from '../ParticleAttributeControl.vue'
import ColorGradientEditor from '../ColorGradientEditor.vue'
import ImageResourceCard from '../ImageResourceCard.vue'
import SpineObjectPanel from '../../spine/SpineObjectPanel.vue'
import { downloadEditorConfig, loadEditorConfigFile, loadEditorConfigText } from '../../editor/editorConfig'
import { beginTransfer, readResponseTextWithProgress } from '../../editor/transferProgress'
import { defaultSpineExportSettings, ensureSpineExportSettings } from '../../export/spineExportSettings'
import { buildSpineJson, downloadSpineJson } from '../../export/spineJsonExporter'
import { validateSpineJson } from '../../export/spineJsonValidator'
import { buildSpineImagesArchive, downloadSpineImagesArchive } from '../../export/spineImagesExporter'
import {
  SpineConnectorError,
  checkSpineConnector,
  convertWithSpineConnector,
  downloadSpineProject,
  type SpineConnectorHealth,
} from '../../export/spineConnectorClient'
import { automaticLoopTransitionFrames } from '../../core/loopSegmentTiming'


export function useParticleExport(store: ReturnType<typeof useParticleStore>) {
store.settings.exportSettings = ensureSpineExportSettings(store.settings.exportSettings)
const exportSettings = computed(() => store.settings.exportSettings)
const exportBusy = ref(false)
const exportTarget = ref<'json' | 'spine' | 'images' | null>(null)
const exportMessage = ref('')
const exportError = ref(false)
const connectorHealth = ref<SpineConnectorHealth | null>(null)
const connectorPairUrl = ref('')
const connectorExportErrorCode = ref('')

const connectorStatusText = computed(() => {
  const health = connectorHealth.value
  if (!health) return '正在检测本地 Spine 连接器…'
  if (!health.available) return '本地 Spine 连接器未启动'
  if (!health.spineFound) return '连接器已启动，但未找到 Spine'
  if (!health.authorized) return '连接器已启动，当前网站尚未授权'
  return '连接器可用 · Spine 已就绪'
})
const connectorStatusClass = computed(() => ({
  ready: !!connectorHealth.value?.available && !!connectorHealth.value?.spineFound && !!connectorHealth.value?.authorized,
  warning: !!connectorHealth.value?.available && (!connectorHealth.value?.spineFound || !connectorHealth.value?.authorized),
}))
const connectorReady = computed(() => !!connectorHealth.value?.available && !!connectorHealth.value?.spineFound && !!connectorHealth.value?.authorized)
const connectorAuthorizationUrl = computed(() => {
  const health = connectorHealth.value
  if (!health?.available || !health.spineFound || health.authorized || typeof window === 'undefined') return ''
  return `http://127.0.0.1:27843/pair?origin=${encodeURIComponent(window.location.origin)}`
})
const connectorDisabledReason = computed(() => {
  const health = connectorHealth.value
  if (!health) return '检测中'
  if (!health.available) return '未启动'
  if (!health.spineFound) return '未找到 Spine'
  if (!health.authorized) return '未授权'
  return ''
})
const connectorButtonTitle = computed(() => {
  if (exportBusy.value) return '正在重新计算并生成 Spine 工程'
  if (connectorDisabledReason.value) return `暂不可用：${connectorDisabledReason.value}`
  return `调用本机 Spine 自动生成 ${exportSettings.value.spineVersion} 工程`
})

onMounted(() => {
  refreshConnectorHealth()
  connectorHealthTimer = window.setInterval(refreshConnectorHealth, 3000)
})

let connectorHealthTimer: number | undefined
let connectorHealthRequestId = 0
onBeforeUnmount(() => {
  if (connectorHealthTimer !== undefined) window.clearInterval(connectorHealthTimer)
})

async function refreshConnectorHealth() {
  const requestId = ++connectorHealthRequestId
  const health = await checkSpineConnector()
  if (requestId !== connectorHealthRequestId) return
  connectorHealth.value = health
  const code = connectorExportErrorCode.value
  const resolved = code === 'CONNECTOR_OFFLINE'
    ? health.available
    : code === 'SPINE_NOT_FOUND'
      ? health.available && health.spineFound
      : code === 'ORIGIN_NOT_ALLOWED'
        ? health.available && health.spineFound && health.authorized
        : !!code && health.available && health.spineFound && health.authorized
  if (resolved) {
    connectorExportErrorCode.value = ''
    connectorPairUrl.value = ''
    if (exportError.value) {
      exportError.value = false
      exportMessage.value = ''
    }
  }
}

function nextPaint() {
  return new Promise<void>((resolve) => requestAnimationFrame(() => resolve()))
}

async function prepareExportFrames(onProgress?: (progress: number) => void) {
  store.timeline.playing = false
  store.timeline.frame = 0
  store.timeline.recorded = false
  for (const system of store.systems) system.frames = undefined
  store.recalcTotalFrames()
  await nextPaint()
  store.timeline.playing = true
  const expectedMs = store.timeline.totalFrames / Math.max(1, store.timeline.fps) * 1000
  const deadline = performance.now() + Math.max(8000, expectedMs * 2.5 + 3000)
  while (!store.timeline.recorded) {
    if (performance.now() > deadline) throw new Error('重新计算动画超时，请确认页面仍在运行后重试')
    onProgress?.(Math.min(0.98, store.timeline.frame / Math.max(1, store.timeline.totalFrames - 1)))
    await new Promise((resolve) => setTimeout(resolve, 50))
  }
  onProgress?.(1)
}

async function exportSpineJson() {
  if (exportBusy.value) return
  exportBusy.value = true
  exportTarget.value = 'json'
  exportError.value = false
  connectorExportErrorCode.value = ''
  connectorPairUrl.value = ''
  exportMessage.value = '正在重新计算粒子动画…'
  try {
    await prepareExportFrames()
    const result = buildSpineJson({ systems: store.systems as unknown as ParticleSystem[], timeline: store.timeline, settings: exportSettings.value })
    validateSpineJson(result.text, exportSettings.value.spineVersion)
    downloadSpineJson(result, exportSettings.value.fileName)
    const warning = result.warnings.length ? `；${result.warnings.length} 条资源提示（缺图仍已导出）` : ''
    exportMessage.value = `已导出 Spine ${exportSettings.value.spineVersion}：${result.particleSystemCount} 个粒子系统、${result.animationCount} 个动画、${result.boneCount} 根骨骼${warning}`
  } catch (error) {
    exportError.value = true
    exportMessage.value = error instanceof Error ? error.message : String(error)
  } finally {
    exportBusy.value = false
    exportTarget.value = null
  }
}

async function exportSpineProject() {
  if (exportBusy.value) return
  exportBusy.value = true
  exportTarget.value = 'spine'
  exportError.value = false
  connectorExportErrorCode.value = ''
  connectorPairUrl.value = ''
  exportMessage.value = '正在重新计算粒子动画…'
  const transfer = beginTransfer('导出 Spine 包', '正在重新计算粒子动画…')
  try {
    await transfer.paint()
    await prepareExportFrames((progress) => transfer.update(progress * 18, '正在重新计算粒子动画…'))
    transfer.update(20, '正在生成 Spine JSON…')
    const result = buildSpineJson({ systems: store.systems as unknown as ParticleSystem[], timeline: store.timeline, settings: exportSettings.value })
    validateSpineJson(result.text, exportSettings.value.spineVersion)
    exportMessage.value = '正在整理图片并调用本机 Spine…'
    const projectName = exportSettings.value.fileName.replace(/\.json$/i, '') || 'SpineParticle'
    const converted = await convertWithSpineConnector({
      projectName,
      spineVersion: exportSettings.value.spineVersion,
      skeletonJson: result.text,
      systems: store.systems as unknown as ParticleSystem[],
    }, ({ phase, progress }) => {
      if (phase === 'images') transfer.update(progress == null ? null : 22 + progress * 18, '正在整理工程图片…')
      else if (phase === 'upload') transfer.update(progress == null ? null : 40 + progress * 30, '正在上传数据到 Spine 连接器…')
      else if (phase === 'processing') transfer.update(null, 'Spine 正在转换工程，请稍候…')
      else transfer.update(progress == null ? null : 82 + progress * 16, '正在下载生成的 Spine 工程包…')
    })
    transfer.update(99, '正在交给浏览器下载…')
    downloadSpineProject(converted.blob, converted.fileName)
    exportMessage.value = `已生成 ${converted.fileName}：包含 .spine 工程和 ${converted.imageCount} 张图片，Spine ${converted.spineEditorVersion}`
    await refreshConnectorHealth()
    await transfer.finish('Spine 工程包已开始下载')
  } catch (error) {
    const errorMessage = error instanceof Error ? error.message : String(error)
    exportError.value = true
    connectorExportErrorCode.value = error instanceof SpineConnectorError ? error.code : ''
    if (error instanceof SpineConnectorError && error.pairUrl) connectorPairUrl.value = error.pairUrl
    exportMessage.value = errorMessage
    await refreshConnectorHealth()
    await transfer.fail(errorMessage)
  } finally {
    exportBusy.value = false
    exportTarget.value = null
  }
}

async function exportSpineImages() {
  if (exportBusy.value) return
  exportBusy.value = true
  exportTarget.value = 'images'
  exportError.value = false
  connectorExportErrorCode.value = ''
  connectorPairUrl.value = ''
  exportMessage.value = '正在整理当前粒子系统使用的图片…'
  try {
    const archive = await buildSpineImagesArchive({
      systems: store.systems as unknown as ParticleSystem[],
      imagesPath: exportSettings.value.imagesPath,
    })
    const fileName = downloadSpineImagesArchive(archive.blob, exportSettings.value.fileName)
    exportMessage.value = `已生成 ${fileName}：${archive.folder}/ 内包含 ${archive.imageCount} 张图片`
  } catch (error) {
    exportError.value = true
    exportMessage.value = error instanceof Error ? error.message : String(error)
  } finally {
    exportBusy.value = false
    exportTarget.value = null
  }
}


return { exportSettings, exportBusy, exportTarget, exportMessage, exportError, connectorHealth, connectorPairUrl, connectorExportErrorCode, connectorStatusText, connectorStatusClass, connectorReady, connectorAuthorizationUrl, connectorDisabledReason, connectorButtonTitle, connectorHealthTimer, connectorHealthRequestId, refreshConnectorHealth, nextPaint, prepareExportFrames, exportSpineJson, exportSpineProject, exportSpineImages }
}