import React, { useState, useCallback, useRef, useEffect } from "react"
import { Modal, Button } from "@/components/ui"
import { createVoiceClone, toVoiceClone } from "@/api/voice-clone"
import { uploadAsset } from "@/api/assets"
import { PROGRESS_STEPS, ACCEPTED_MIME } from "./constants"
import { validateFile } from "./utils"
import { useAudioRecorder } from "./hooks/useAudioRecorder"
import type { CloneModalProps, ModalPhase } from "./types"
import "./clone-modal.css"

/** 根据 MIME 类型推断文件扩展名 */
const getExtensionFromMime = (mime: string): string => {
  if (mime.includes("webm")) return "webm"
  if (mime.includes("mp4") || mime.includes("m4a")) return "m4a"
  if (mime.includes("ogg")) return "ogg"
  if (mime.includes("wav")) return "wav"
  return "webm"
}

const CloneModal: React.FC<CloneModalProps> = ({ open, onClose, onSuccess }) => {
  const [phase, setPhase] = useState<ModalPhase>("input")
  const [voiceName, setVoiceName] = useState("")
  const [voiceDescription, setVoiceDescription] = useState("")
  const [selectedFile, setSelectedFile] = useState<File | null>(null)
  const [dragActive, setDragActive] = useState(false)
  const [errorMessage, setErrorMessage] = useState("")

  const fileInputRef = useRef<HTMLInputElement>(null)
  const timerRef = useRef<ReturnType<typeof setTimeout> | null>(null)
  /** 默认音色名称计数器（组件级 ref，避免多实例串号） */
  const cloneCounterRef = useRef(1)
  /** 组件挂载状态标记，防止卸载后更新 state */
  const isMountedRef = useRef(true)
  const isSubmittingRef = useRef(false)

  /* ── 录音 Hook ──────────────────────────────────── */
  const {
    isRecording,
    recordedBlob,
    formattedTime,
    toggleRecord,
    reset: resetRecorder,
  } = useAudioRecorder(setErrorMessage)

  /** 生成下一个默认音色名称 */
  const getNextDefaultName = useCallback((): string => {
    const name = `我的声音 ${cloneCounterRef.current}`
    cloneCounterRef.current += 1
    return name
  }, [])

  /** 重置弹窗状态 */
  const resetState = useCallback(() => {
    setPhase("input")
    setVoiceName(getNextDefaultName())
    setVoiceDescription("")
    setSelectedFile(null)
    setDragActive(false)
    if (isSubmittingRef.current) return
    isSubmittingRef.current = true
    setErrorMessage("")
    resetRecorder()
  }, [getNextDefaultName, resetRecorder])

  /** 关闭弹窗 */
  const handleClose = useCallback(() => {
    resetState()
    onClose()
  }, [resetState, onClose])

  /** 弹窗打开时重置状态 */
  useEffect(() => {
    if (open) {
      resetState()
    }
  }, [open, resetState])

  /** 组件挂载/卸载标记 + 清理定时器 */
  useEffect(() => {
    isMountedRef.current = true
    return () => {
      isMountedRef.current = false
      if (timerRef.current) clearTimeout(timerRef.current)
    }
  }, [])

  /* ── 文件上传 ──────────────────────────────────── */

  const handleUploadClick = () => {
    fileInputRef.current?.click()
  }

  const handleFileChange = (e: React.ChangeEvent<HTMLInputElement>) => {
    const file = e.target.files?.[0]
    if (file) {
      const error = validateFile(file)
      if (error) {
        setErrorMessage(error)
        setSelectedFile(null)
      } else {
        if (isSubmittingRef.current) return
        isSubmittingRef.current = true
        setErrorMessage("")
        setSelectedFile(file)
        resetRecorder()
      }
    }
    e.target.value = ""
  }

  /* ── 拖拽 ──────────────────────────────────────── */

  const handleDrag = (e: React.DragEvent) => {
    e.preventDefault()
    e.stopPropagation()
    if (e.type === "dragenter" || e.type === "dragover") {
      setDragActive(true)
    } else if (e.type === "dragleave") {
      setDragActive(false)
    }
  }

  const handleDrop = (e: React.DragEvent) => {
    e.preventDefault()
    e.stopPropagation()
    setDragActive(false)
    const file = e.dataTransfer.files?.[0]
    if (file) {
      const error = validateFile(file)
      if (error) {
        setErrorMessage(error)
        setSelectedFile(null)
      } else {
        if (isSubmittingRef.current) return
        isSubmittingRef.current = true
        setErrorMessage("")
        setSelectedFile(file)
        resetRecorder()
      }
    }
  }

  /* ── 计算属性 ──────────────────────────────────── */

  const hasAudio = selectedFile !== null || recordedBlob !== null
  const isProcessing = phase === "uploading" || phase === "cloning"
  const canSubmit = hasAudio && !isProcessing

  const progressIndex = PROGRESS_STEPS.findIndex((s) => s.key === phase)

  /* ── 提交 ──────────────────────────────────────── */

  const handleSubmit = async () => {
    const name = voiceName.trim()
    if (!name || name.length < 2 || name.length > 20) {
      setErrorMessage("音色名称需在 2-20 个字符之间")
      return
    }
    if (!hasAudio) {
      setErrorMessage("请上传音频文件或录制一段声音")
      return
    }

    if (isSubmittingRef.current) return
    isSubmittingRef.current = true
    setErrorMessage("")

    try {
      // 阶段 1：上传音频
      setPhase("uploading")

      let fileToUpload: File
      if (selectedFile) {
        fileToUpload = selectedFile
      } else {
        // 使用浏览器实际生成的 MIME 类型，避免跨浏览器格式不匹配
        const mimeType = recordedBlob?.type || "audio/webm"
        const ext = getExtensionFromMime(mimeType)
        fileToUpload = new File([recordedBlob!], `recorded-${Date.now()}.${ext}`, {
          type: mimeType,
        })
      }

      const formData = new FormData()
      formData.append("file", fileToUpload)
      const uploadResult = await uploadAsset(formData)

      // 组件已卸载则中止后续操作
      if (!isMountedRef.current) return

      // 阶段 2：克隆
      setPhase("cloning")
      const result = await createVoiceClone({
        name,
        description: voiceDescription.trim() || undefined,
        audio_url: uploadResult.url,
      })

      // 组件已卸载则中止后续操作
      if (!isMountedRef.current) return

      isSubmittingRef.current = false
      // 阶段 3：完成
      setPhase("done")

      // 2秒后自动关闭
      timerRef.current = setTimeout(() => {
        if (isMountedRef.current) {
          onSuccess?.(toVoiceClone(result))
          handleClose()
        }
      }, 2000)
    } catch (err) {
      isSubmittingRef.current = false
      // 组件已卸载则不更新 state
      if (!isMountedRef.current) return
      setPhase("input")
      setErrorMessage(err instanceof Error ? err.message : "克隆失败，请重试")
    }
  }

  return (
    <Modal
      open={open}
      onCancel={handleClose}
      title="克隆我的音色"
      width={560}
      footer={null}
      destroyOnClose
      maskClosable={!isProcessing}
      keyboard={!isProcessing}
    >
      {/* ── 输入阶段 ────────────────────────────────── */}
      {phase === "input" && (
        <div className="xx-clonemodal-body">
          {/* 步骤引导 */}
          <div className="xx-clonemodal-steps">
            <div className="xx-clonemodal-step xx-clonemodal-step--active">
              <div className="xx-clonemodal-step-number">1</div>
              <span className="xx-clonemodal-step-label">上传/录制音频</span>
            </div>
            <div className="xx-clonemodal-step-connector" />
            <div className="xx-clonemodal-step">
              <div className="xx-clonemodal-step-number">2</div>
              <span className="xx-clonemodal-step-label">填写信息</span>
            </div>
            <div className="xx-clonemodal-step-connector" />
            <div className="xx-clonemodal-step">
              <div className="xx-clonemodal-step-number">3</div>
              <span className="xx-clonemodal-step-label">提交克隆</span>
            </div>
          </div>

          {/* 音色名称 */}
          <div className="xx-clonemodal-field">
            <label className="xx-clonemodal-label">
              音色名称 <span className="xx-clonemodal-required">*</span>
            </label>
            <input
              type="text"
              className="xx-clonemodal-input"
              value={voiceName}
              onChange={(e) => setVoiceName(e.target.value)}
              placeholder="输入音色名称（2-20字符）"
              maxLength={20}
            />
            <div className="xx-clonemodal-char-count">{voiceName.length}/20</div>
          </div>

          {/* 上传区域 */}
          <div className="xx-clonemodal-field">
            <label className="xx-clonemodal-label">上传音频</label>
            <div
              className={`xx-clonemodal-upload-zone${dragActive ? " xx-clonemodal-upload-zone--active" : ""}${selectedFile ? " xx-clonemodal-upload-zone--has-file" : ""}`}
              onClick={handleUploadClick}
              onDragEnter={handleDrag}
              onDragOver={handleDrag}
              onDragLeave={handleDrag}
              onDrop={handleDrop}
            >
              <div className="xx-clonemodal-upload-icon">{selectedFile ? "📄" : "🎵"}</div>
              <p className="xx-clonemodal-upload-title">
                {selectedFile ? selectedFile.name : "拖拽音频文件到此处，或点击上传"}
              </p>
              <p className="xx-clonemodal-upload-hint">支持 MP3、WAV、M4A 格式，最大 10MB</p>
              <input
                ref={fileInputRef}
                type="file"
                accept={ACCEPTED_MIME}
                style={{ display: "none" }}
                onChange={handleFileChange}
              />
            </div>
          </div>

          {/* 或分隔 */}
          <div className="xx-clonemodal-divider">
            <div className="xx-clonemodal-divider-line" />
            <span className="xx-clonemodal-divider-text">或</span>
            <div className="xx-clonemodal-divider-line" />
          </div>

          {/* 录制区域 */}
          <div className="xx-clonemodal-field">
            <label className="xx-clonemodal-label">直接录制</label>
            <div className="xx-clonemodal-record-area">
              <div className="xx-clonemodal-record-info">
                <p className="xx-clonemodal-record-hint">
                  {isRecording
                    ? `录制中 ${formattedTime}`
                    : recordedBlob
                      ? `已录制 ${formattedTime}`
                      : "点击按钮开始录制（最长 5 分钟）"}
                </p>
                {isRecording && (
                  <div className="xx-clonemodal-record-wave">
                    <span className="xx-clonemodal-record-wave-bar" />
                    <span className="xx-clonemodal-record-wave-bar" />
                    <span className="xx-clonemodal-record-wave-bar" />
                    <span className="xx-clonemodal-record-wave-bar" />
                    <span className="xx-clonemodal-record-wave-bar" />
                  </div>
                )}
              </div>
              <button
                type="button"
                className={`xx-clonemodal-record-btn${isRecording ? " xx-clonemodal-record-btn--recording" : ""}`}
                onClick={toggleRecord}
                title={isRecording ? "停止录制" : "开始录制"}
              >
                {isRecording ? "⏹" : "🎙️"}
              </button>
            </div>
          </div>

          {/* 音色描述 */}
          <div className="xx-clonemodal-field">
            <label className="xx-clonemodal-label">音色描述</label>
            <textarea
              className="xx-clonemodal-textarea"
              value={voiceDescription}
              onChange={(e) => setVoiceDescription(e.target.value)}
              placeholder="可选，描述这个音色的特点（最多100字符）"
              maxLength={100}
              rows={3}
            />
            <div className="xx-clonemodal-char-count">{voiceDescription.length}/100</div>
          </div>

          {/* 错误提示 */}
          {errorMessage && (
            <div className="xx-clonemodal-error">
              <span className="xx-clonemodal-error-icon">⚠️</span>
              <span>{errorMessage}</span>
            </div>
          )}

          {/* 提示 */}
          <div className="xx-clonemodal-tip">
            <span className="xx-clonemodal-tip-icon">💡</span>
            <span>建议上传 10 秒 ~ 3 分钟的清晰语音，环境安静、语速均匀效果最佳</span>
          </div>

          {/* 底部按钮 */}
          <div className="xx-clonemodal-footer">
            <Button buttonType="ghost" onClick={handleClose}>
              取消
            </Button>
            <Button buttonType="primary" disabled={!canSubmit} onClick={handleSubmit}>
              🎤 开始克隆
            </Button>
          </div>
        </div>
      )}

      {/* ── 进度阶段（上传中 / 克隆中） ────────────── */}
      {isProcessing && (
        <div className="xx-clonemodal-progress-body">
          {/* 步骤指示器 */}
          <div className="xx-clonemodal-steps-progress">
            {PROGRESS_STEPS.map((step, idx) => {
              const isActive = idx === progressIndex
              const isDone = idx < progressIndex
              const stepClass = [
                "xx-clonemodal-step-progress",
                isActive ? "xx-clonemodal-step-progress--active" : "",
                isDone ? "xx-clonemodal-step-progress--done" : "",
              ]
                .filter(Boolean)
                .join(" ")

              return (
                <React.Fragment key={step.key}>
                  {idx > 0 && (
                    <div
                      className={`xx-clonemodal-step-connector${isDone ? " xx-clonemodal-step-connector--done" : ""}`}
                    />
                  )}
                  <div className={stepClass}>
                    <div className="xx-clonemodal-step-icon">{isDone ? "✓" : step.icon}</div>
                    <span className="xx-clonemodal-step-label">{step.label}</span>
                  </div>
                </React.Fragment>
              )
            })}
          </div>

          {/* 当前阶段描述 */}
          <div className="xx-clonemodal-progress-info">
            {phase === "uploading" && (
              <>
                <div className="xx-clonemodal-progress-spinner" />
                <p className="xx-clonemodal-progress-text">正在上传音频文件…</p>
                <p className="xx-clonemodal-progress-sub">请稍候，正在将音频上传至服务器</p>
              </>
            )}
            {phase === "cloning" && (
              <>
                <div className="xx-clonemodal-progress-spinner xx-clonemodal-progress-spinner--cloning" />
                <p className="xx-clonemodal-progress-text">AI 正在克隆你的声音…</p>
                <p className="xx-clonemodal-progress-sub">正在分析声音特征，生成专属音色模型</p>
              </>
            )}
          </div>
        </div>
      )}

      {/* ── 完成阶段 ────────────────────────────────── */}
      {phase === "done" && (
        <div className="xx-clonemodal-progress-body">
          {/* 步骤指示器（全部完成） */}
          <div className="xx-clonemodal-steps-progress">
            {PROGRESS_STEPS.map((step, idx) => (
              <React.Fragment key={step.key}>
                {idx > 0 && (
                  <div className="xx-clonemodal-step-connector xx-clonemodal-step-connector--done" />
                )}
                <div className="xx-clonemodal-step-progress xx-clonemodal-step-progress--done">
                  <div className="xx-clonemodal-step-icon">✓</div>
                  <span className="xx-clonemodal-step-label">{step.label}</span>
                </div>
              </React.Fragment>
            ))}
          </div>

          <div className="xx-clonemodal-success">
            <div className="xx-clonemodal-success-icon">🎉</div>
            <h3 className="xx-clonemodal-success-title">克隆已提交</h3>
            <p className="xx-clonemodal-success-desc">
              音色正在生成中，完成后将出现在「我的克隆」列表中
            </p>
          </div>
        </div>
      )}
    </Modal>
  )
}

export default CloneModal
export type { CloneModalProps, ModalPhase } from "./types"