/**
 * GeneratePage 表单状态管理
 * 集中管理 7 步向导的所有共享状态、API 加载、URL 参数解析
 */
import { useState, useEffect, useMemo } from "react"
import { useQuery } from "@tanstack/react-query"
import { useSearchParams } from "react-router-dom"
import type { GeneratedVideo, TitleConfig } from "@/api/template-editor"
import type { EditingTemplate } from "@/api/editing-planner"
import { getEditPlan } from "@/api/template-editor"
import type { CoverConfig } from "../../editing-planner/types"
import { getEditingTemplates } from "@/api/editing-planner"
import type { PresetVoiceItem } from "@/api/voices"
import { fetchPresetVoices } from "@/api/voices"
import { DEFAULT_COVER_SETTINGS } from "../constants"
import type { TitleSettings } from "../types"

const DEFAULT_TITLE_SETTINGS: TitleSettings = {
  aiAutoSelect: false,
  title: "",
  position: "bottom",
  font: "思源黑体",
  size: 28,
  bold: true,
  italic: false,
  stroke: true,
  shadow: false,
  color: "#ffffff",
}

export interface GenerateFormState {
  /* 步骤 */
  currentStep: number
  setCurrentStep: (step: number | ((prev: number) => number)) => void

  /* 模板 */
  selectedTemplate: string
  setSelectedTemplate: (id: string) => void
  userTemplates: EditingTemplate[]

  /* 素材 */
  selectedMaterials: string[]
  setSelectedMaterials: (ids: string[]) => void
  materialMode: "manual" | "auto"
  setMaterialMode: (mode: "manual" | "auto") => void
  smartSelectedIds: string[]
  setSmartSelectedIds: (ids: string[]) => void

  /* 标题 */
  titleSettings: TitleSettings
  setTitleSettings: (settings: TitleSettings | ((prev: TitleSettings) => TitleSettings)) => void

  /* 封面 */
  coverSettings: CoverConfig
  setCoverSettings: (settings: CoverConfig | ((prev: CoverConfig) => CoverConfig)) => void

  /* 配音 */
  selectedVoice: string
  setSelectedVoice: (id: string) => void
  voiceMode: "preset" | "custom" | "clone"
  setVoiceMode: (mode: "preset" | "custom" | "clone") => void
  selectedClonedVoice: string
  setSelectedClonedVoice: (id: string) => void
  presetVoices: PresetVoiceItem[]

  /* 克隆弹窗 */
  cloneModalOpen: boolean
  setCloneModalOpen: (open: boolean) => void

  /* 生成数量 */
  generateCount: number
  setGenerateCount: (n: number) => void

  /* 高级设置 */
  videoRatio: string
  duration: number
  style: string
  autoSubtitles: boolean
  bgm: boolean

  /* URL 参数 */
  editPlanId: string | null
  planConfigStr: string | null

  /* 预览弹窗 */
  previewVideo: GeneratedVideo | null
  setPreviewVideo: (v: GeneratedVideo | null) => void
  previewModalOpen: boolean
  setPreviewModalOpen: (open: boolean) => void
}

export const useGenerateFormState = (): GenerateFormState => {
  const [searchParams] = useSearchParams()
  const editPlanId = searchParams.get("edit_plan_id")
  const planConfigStr = searchParams.get("plan_config")

  /* ── 步骤状态 ── */
  const [currentStep, setCurrentStep] = useState(1)

  /* ── 模板（从 API 加载） ── */
  const [selectedTemplate, setSelectedTemplate] = useState("")
  const { data: userTemplates = [] } = useQuery({
    queryKey: ["generate-templates"],
    queryFn: () => getEditingTemplates(),
    staleTime: 60_000,
  })
  /* 模板加载完成后自动选中第一个 */
  useEffect(() => {
    if (userTemplates.length > 0 && !selectedTemplate) {
      setSelectedTemplate(userTemplates[0].id)
    }
  }, [userTemplates, selectedTemplate])

  /* ── 素材 ── */
  const [selectedMaterials, setSelectedMaterials] = useState<string[]>([])
  const [materialMode, setMaterialMode] = useState<"manual" | "auto">("manual")
  const [smartSelectedIds, setSmartSelectedIds] = useState<string[]>([])

  /* ── 标题设置 ── */
  const [titleSettings, setTitleSettings] = useState<TitleSettings>(DEFAULT_TITLE_SETTINGS)

  /* ── 封面设置 ── */
  const [coverSettings, setCoverSettings] = useState<CoverConfig>(DEFAULT_COVER_SETTINGS)

  /* 当选中模板开启了「AI自动匹配标题」，自动填入模板预设标题 / 封面 */
  useEffect(() => {
    const tpl = userTemplates.find((t) => t.id === selectedTemplate)
    if (tpl?.title_config) {
      setTitleSettings((prev) => ({
        ...prev,
        aiAutoSelect: tpl.title_config!.ai_auto_select,
        title: tpl.title_config!.content || prev.title,
        position: tpl.title_config!.position || prev.position,
        font: tpl.title_config!.font_preset || prev.font,
        size: tpl.title_config!.font_size || prev.size,
        color: tpl.title_config!.font_color || prev.color,
      }))
    }
    if (tpl?.cover_config) {
      setCoverSettings((prev) => ({
        ...prev,
        enabled: tpl.cover_config!.enabled ?? prev.enabled,
        mode: (tpl.cover_config!.mode as CoverConfig["mode"]) || prev.mode,
        frame_time: tpl.cover_config!.frame_time ?? prev.frame_time,
        upload_url: tpl.cover_config!.upload_url || prev.upload_url,
        ai_suggested_time: tpl.cover_config!.ai_suggested_time ?? prev.ai_suggested_time,
        thumbnail_url: tpl.cover_config!.thumbnail_url || prev.thumbnail_url,
      }))
    }
  }, [selectedTemplate, userTemplates])

  /* ── 配音 ── */
  const [selectedVoice, setSelectedVoice] = useState("")
  const [voiceMode, setVoiceMode] = useState<"preset" | "custom" | "clone">("preset")
  const [selectedClonedVoice, setSelectedClonedVoice] = useState("")

  /* ── 预置音色 API ── */
  const { data: presetVoicesData } = useQuery({
    queryKey: ["preset-voices"],
    queryFn: fetchPresetVoices,
  })
  const presetVoices: PresetVoiceItem[] = useMemo(
    () => presetVoicesData?.items ?? [],
    [presetVoicesData],
  )

  /* ── 克隆声音弹窗 ── */
  const [cloneModalOpen, setCloneModalOpen] = useState(false)

  /* ── 生成数量 ── */
  const [generateCount, setGenerateCount] = useState(1)

  /* ── 高级设置（隐藏但保留） ── */
  const [videoRatio] = useState("16:9")
  const [duration] = useState(30)
  const [style] = useState("business")
  const [autoSubtitles] = useState(true)
  const [bgm] = useState(true)

  /* ── 预览弹窗 ── */
  const [previewVideo, setPreviewVideo] = useState<GeneratedVideo | null>(null)
  const [previewModalOpen, setPreviewModalOpen] = useState(false)

  /** 解析 plan_config 并自动填充表单 */
  useEffect(() => {
    if (!planConfigStr) return
    try {
      const config = JSON.parse(planConfigStr) as {
        title_config?: {
          content?: string
          ai_auto_select?: boolean
          position?: string
          font_preset?: string
          font_size?: number
          font_color?: string
        }
        subtitle_config?: { enabled?: boolean }
        bgm_config?: { enabled?: boolean; music_id?: string }
        mode?: string
        total_duration?: number
        segments?: Array<{ media_asset_id?: string; material_type?: string }>
      }

      if (config.title_config) {
        const tc = config.title_config as TitleConfig
        setTitleSettings((prev) => ({
          ...prev,
          title: tc.content || "",
          aiAutoSelect: tc.ai_auto_select || false,
          position: tc.position || prev.position,
          font: tc.font_preset || prev.font,
          size: tc.font_size || prev.size,
          color: tc.font_color || prev.color,
        }))
      }
      if (config.segments && config.segments.length > 0) {
        const assetIds = config.segments
          .map((s) => s.media_asset_id)
          .filter((id): id is string => !!id)
        if (assetIds.length > 0) {
          setSelectedMaterials(assetIds)
        }
      }
    } catch (err) {
      console.warn("解析 plan_config 失败:", err)
    }
  }, [planConfigStr])

  /** 如果没有 plan_config，尝试通过 edit_plan_id 从后端拉取配置 */
  useEffect(() => {
    if (!editPlanId || planConfigStr) return
    const loadPlanConfig = async () => {
      try {
        const plan = await getEditPlan(editPlanId)
        if (plan.name) setTitleSettings((prev) => ({ ...prev, title: plan.name }))
        const cfg = plan.config
        if (cfg?.title_config) {
          setTitleSettings((prev) => ({
            ...prev,
            aiAutoSelect: cfg.title_config!.ai_auto_select,
            title: cfg.title_config!.content || prev.title,
            position: cfg.title_config!.position || prev.position,
            font: cfg.title_config!.font_preset || prev.font,
            size: cfg.title_config!.font_size || prev.size,
            color: cfg.title_config!.font_color || prev.color,
          }))
        }
        if (cfg?.cover_config) {
          const cc = cfg.cover_config as CoverConfig
          setCoverSettings((prev) => ({
            ...prev,
            enabled: cc.enabled ?? prev.enabled,
            mode: cc.mode || prev.mode,
            frame_time: cc.frame_time ?? prev.frame_time,
            upload_url: cc.upload_url || prev.upload_url,
            ai_suggested_time: cc.ai_suggested_time ?? prev.ai_suggested_time,
            thumbnail_url: cc.thumbnail_url || prev.thumbnail_url,
          }))
        }
        if (cfg?.asset_ids) {
          setSelectedMaterials(cfg.asset_ids.filter((v): v is string => typeof v === "string"))
        }
      } catch (err) {
        console.warn("加载模板草稿配置失败:", err)
      }
    }
    loadPlanConfig()
  }, [editPlanId, planConfigStr])

  return {
    currentStep,
    setCurrentStep,
    selectedTemplate,
    setSelectedTemplate,
    userTemplates,
    selectedMaterials,
    setSelectedMaterials,
    materialMode,
    setMaterialMode,
    smartSelectedIds,
    setSmartSelectedIds,
    titleSettings,
    setTitleSettings,
    coverSettings,
    setCoverSettings,
    selectedVoice,
    setSelectedVoice,
    voiceMode,
    setVoiceMode,
    selectedClonedVoice,
    setSelectedClonedVoice,
    presetVoices,
    cloneModalOpen,
    setCloneModalOpen,
    generateCount,
    setGenerateCount,
    videoRatio,
    duration,
    style,
    autoSubtitles,
    bgm,
    editPlanId,
    planConfigStr,
    previewVideo,
    setPreviewVideo,
    previewModalOpen,
    setPreviewModalOpen,
  }
}