import { useState, useCallback, useMemo } from "react"
import { Modal, message } from "antd"
import type {
  ClipData,
  ClipType,
  TransitionConfig,
  SpeedConfig,
  TtsConfig,
  TrimConfig,
} from "../types"
import type { AssetItem } from "@/api/assets"

interface UseClipOperationsParams {
  clips: ClipData[]
  setClips: (updater: (prev: ClipData[]) => ClipData[]) => void
}

/**
 * 片段操作 Hook
 * 片段增删改查、排序、裁剪、分割、转场、调速、TTS、配音选择
 */
export const useClipOperations = ({ clips, setClips }: UseClipOperationsParams) => {
  const [selectedClipId, setSelectedClipId] = useState<string | null>(null)

  const selectedClip = useMemo(
    () => clips.find((c) => c.id === selectedClipId) || null,
    [clips, selectedClipId],
  )

  /* ── 选中 / 重排 / 删除 ── */

  const handleClipSelect = useCallback((clipId: string) => {
    setSelectedClipId(clipId)
  }, [])

  const handleClipReorder = useCallback(
    (fromIdx: number, toIdx: number) => {
      setClips((prev) => {
        const updated = [...prev]
        const [moved] = updated.splice(fromIdx, 1)
        updated.splice(toIdx, 0, moved)
        return updated.map((c, i) => ({ ...c, order: i }))
      })
    },
    [setClips],
  )

  const handleClipRemove = useCallback(
    (clipId: string) => {
      Modal.confirm({
        title: "删除片段",
        content: "确定要删除这个片段吗？此操作可通过撤销恢复。",
        okText: "删除",
        okType: "danger",
        cancelText: "取消",
        onOk: () => {
          setClips((prev) => prev.filter((c) => c.id !== clipId))
          if (selectedClipId === clipId) setSelectedClipId(null)
        },
      })
    },
    [setClips, selectedClipId],
  )

  const handleClipUpdate = useCallback(
    (clipId: string, data: Partial<ClipData>) => {
      setClips((prev) => prev.map((c) => (c.id === clipId ? { ...c, ...data } : c)))
    },
    [setClips],
  )

  /**
   * 添加片段（不绑定任何素材）
   * 片段 = 时间规划 + 类型标记
   */
  const handleAddClip = useCallback(
    (type: ClipType, duration: number) => {
      const newClip: ClipData = {
        id: `clip-${Date.now()}`,
        type,
        duration,
        startOffset: 0,
        order: clips.length,
      }
      setClips((prev) => [...prev, newClip])
    },
    [clips.length, setClips],
  )

  /* ── 裁剪 / 分割 / 重置 ── */

  const handleClipTrim = useCallback(
    (clipId: string, trimConfig: TrimConfig, newDuration: number) => {
      setClips((prev) =>
        prev.map((c) =>
          c.id === clipId ? { ...c, trim_config: trimConfig, duration: newDuration } : c,
        ),
      )
    },
    [setClips],
  )

  const handleClipSplit = useCallback(
    (clipId: string, splitRatio: number) => {
      setClips((prev) => {
        const idx = prev.findIndex((c) => c.id === clipId)
        if (idx === -1) return prev
        const clip = prev[idx]
        const splitPoint = Math.round(clip.duration * splitRatio * 10) / 10
        if (splitPoint < 0.5 || splitPoint >= clip.duration - 0.5) return prev

        // 前半段
        const firstHalf: ClipData = {
          ...clip,
          duration: splitPoint,
          trim_config: clip.trim_config
            ? {
                ...clip.trim_config,
                end_time: clip.trim_config.start_time + splitPoint,
              }
            : undefined,
        }

        // 后半段
        const secondHalf: ClipData = {
          ...clip,
          id: `clip-${Date.now()}`,
          duration: clip.duration - splitPoint,
          startOffset: clip.startOffset + splitPoint,
          trim_config: clip.trim_config
            ? {
                ...clip.trim_config,
                start_time: clip.trim_config.start_time + splitPoint,
              }
            : undefined,
          order: (clip.order ?? idx) + 1,
        }

        const updated = [...prev]
        updated[idx] = firstHalf
        updated.splice(idx + 1, 0, secondHalf)
        return updated.map((c, i) => ({ ...c, order: i }))
      })
    },
    [setClips],
  )

  const handleClipResetTrim = useCallback(
    (clipId: string) => {
      setClips((prev) =>
        prev.map((c) => {
          if (c.id !== clipId || !c.trim_config) return c
          const originalDuration = c.trim_config.original_duration ?? c.duration
          return {
            ...c,
            duration: originalDuration,
            trim_config: undefined,
          }
        }),
      )
    },
    [setClips],
  )

  /* ── 转场 / 调速 / TTS ── */

  const handleTransitionChange = useCallback(
    (targetClipId: string | null, config: TransitionConfig) => {
      if (targetClipId) {
        handleClipUpdate(targetClipId, { transition: config })
      }
      // 同时更新全局默认转场（供新片段使用）—— 暂未实现全局默认
    },
    [handleClipUpdate],
  )

  const handleSpeedChange = useCallback(
    (targetClipId: string | null, config: SpeedConfig) => {
      if (targetClipId) {
        handleClipUpdate(targetClipId, { speed: config })
      }
    },
    [handleClipUpdate],
  )

  const handleApplySpeedAll = useCallback(
    (config: SpeedConfig) => {
      setClips((prev) => prev.map((c) => ({ ...c, speed: { ...config } })))
      message.success("已应用到所有片段")
    },
    [setClips],
  )

  const handleTtsChange = useCallback(
    (targetClipId: string | null, ttsConfig: TtsConfig) => {
      if (!targetClipId) return
      handleClipUpdate(targetClipId, { tts_config: ttsConfig })
    },
    [handleClipUpdate],
  )

  /** 为片段选择配音素材 */
  const handleClipVoiceSelect = useCallback(
    (clipId: string, asset: AssetItem | null) => {
      setClips((prev) =>
        prev.map((c) =>
          c.id === clipId
            ? {
                ...c,
                voice_asset_id: asset?.id ?? undefined,
                voice_file_url: asset?.file_url ?? undefined,
              }
            : c,
        ),
      )
    },
    [setClips],
  )

  return {
    selectedClipId,
    setSelectedClipId,
    selectedClip,
    handleClipSelect,
    handleClipReorder,
    handleClipRemove,
    handleClipUpdate,
    handleAddClip,
    handleClipTrim,
    handleClipSplit,
    handleClipResetTrim,
    handleTransitionChange,
    handleSpeedChange,
    handleApplySpeedAll,
    handleTtsChange,
    handleClipVoiceSelect,
  }
}