import { useState, useCallback, useMemo } from "react"
import type { StickerConfig, StickerItem, StickerType } from "../../../types"
import { DEFAULT_STICKER_CONFIG, DEFAULT_STICKER_ITEM } from "../../../types"
import { genStickerId } from "../constants"

interface UseStickerPanelOptions {
  config: StickerConfig
  onChange: (config: StickerConfig) => void
  totalDuration: number
}

export const useStickerPanel = ({ config, onChange, totalDuration }: UseStickerPanelOptions) => {
  const [selectedId, setSelectedId] = useState<string | null>(null)
  const [activeTab, setActiveTab] = useState<StickerType>("emoji")
  const [textInput, setTextInput] = useState("")

  const selectedSticker = useMemo(
    () => config.items.find((s) => s.id === selectedId) ?? null,
    [config.items, selectedId],
  )

  /** 更新单个贴纸 */
  const updateItem = useCallback(
    (id: string, partial: Partial<StickerItem>) => {
      onChange({
        ...config,
        items: config.items.map((s) => (s.id === id ? { ...s, ...partial } : s)),
      })
    },
    [config, onChange],
  )

  /** 添加贴纸 */
  const addSticker = useCallback(
    (type: StickerType, content: string) => {
      const newItem: StickerItem = {
        ...DEFAULT_STICKER_ITEM,
        id: genStickerId(),
        type,
        content,
        duration: totalDuration > 0 ? totalDuration : 5,
        z_index: config.items.length > 0 ? Math.max(...config.items.map((i) => i.z_index)) + 1 : 1,
      }
      onChange({
        ...config,
        enabled: true,
        items: [...config.items, newItem],
      })
      setSelectedId(newItem.id)
    },
    [config, onChange, totalDuration],
  )

  /** 删除贴纸 */
  const removeSticker = useCallback(
    (id: string) => {
      onChange({
        ...config,
        items: config.items.filter((s) => s.id !== id),
      })
      if (selectedId === id) setSelectedId(null)
    },
    [config, onChange, selectedId],
  )

  /** 重置所有 */
  const handleReset = useCallback(() => {
    onChange({ ...DEFAULT_STICKER_CONFIG, enabled: config.enabled })
    setSelectedId(null)
  }, [config.enabled, onChange])

  return {
    selectedId,
    setSelectedId,
    selectedSticker,
    activeTab,
    setActiveTab,
    textInput,
    setTextInput,
    updateItem,
    addSticker,
    removeSticker,
    handleReset,
  }
}