import { useEffect } from "react"
import type { CoverConfig } from "../../types/cover"
import type { TitleSettings } from "../../types"
import type { TitleLineOverride } from "@/components/title/types"
import type { TitleConfig } from "@/api/template-editor"
import { getEditPlan } from "@/api/template-editor"

interface UsePlanConfigLoaderOptions {
  editPlanId: string | null
  planConfigStr: string | null
  setTitleSettings: (settings: TitleSettings | ((prev: TitleSettings) => TitleSettings)) => void
  setCoverSettings: (settings: CoverConfig | ((prev: CoverConfig) => CoverConfig)) => void
  setSelectedMaterials: (ids: string[]) => void
}

/** #2001：统一归一化 title_config snake_case -> camelCase TitleSettings */
function mapTitleCfgToSettings(
  prev: TitleSettings,
  tc: TitleConfig & Record<string, unknown>,
): TitleSettings {
  const stroke = tc.stroke as
    boolean | { enabled?: boolean; width?: number; color?: string } | undefined
  const strokeEnabled: boolean | undefined =
    typeof stroke === "object" && stroke ? stroke.enabled !== false : !!stroke || undefined
  const strokeW: number | undefined =
    typeof stroke === "object" && stroke
      ? (stroke.width ?? (tc.stroke_width as number | undefined))
      : (tc.stroke_width as number | undefined)
  const strokeC: string | undefined =
    typeof stroke === "object" && stroke
      ? (stroke.color ?? (tc.stroke_color as string | undefined))
      : (tc.stroke_color as string | undefined)

  const shadow = tc.shadow as
    | boolean
    | { enabled?: boolean; offset_x?: number; offset_y?: number; blur?: number; color?: string }
    | undefined
  const shadowEnabled: boolean | undefined =
    typeof shadow === "object" && shadow ? shadow.enabled !== false : !!shadow || undefined
  const shOffX: number | undefined =
    typeof shadow === "object" && shadow
      ? (shadow.offset_x ?? (tc.shadow_offset_x as number | undefined))
      : (tc.shadow_offset_x as number | undefined)
  const shOffY: number | undefined =
    typeof shadow === "object" && shadow
      ? (shadow.offset_y ?? (tc.shadow_offset_y as number | undefined))
      : (tc.shadow_offset_y as number | undefined)
  const shBlur: number | undefined =
    typeof shadow === "object" && shadow
      ? (shadow.blur ?? (tc.shadow_blur as number | undefined))
      : (tc.shadow_blur as number | undefined)
  const shColor: string | undefined =
    typeof shadow === "object" && shadow
      ? (shadow.color ?? (tc.shadow_color as string | undefined))
      : (tc.shadow_color as string | undefined)

  const bg = tc.background as
    { enabled?: boolean; color?: string; padding?: number; radius?: number } | undefined
  const bgEnabled: boolean | undefined =
    (bg && typeof bg === "object" ? bg.enabled : undefined) ??
    (tc.bg_enabled as boolean | undefined)
  const bgColor: string | undefined =
    (bg && typeof bg === "object" ? bg.color : undefined) ?? (tc.bg_color as string | undefined)
  const bgPadding: number | undefined =
    (bg && typeof bg === "object" ? bg.padding : undefined) ?? (tc.bg_padding as number | undefined)
  const bgRadius: number | undefined =
    (bg && typeof bg === "object" ? bg.radius : undefined) ?? (tc.bg_radius as number | undefined)

  const ct = (tc.cover_title_config ?? null) as null | Record<string, unknown>
  let coverTitle: TitleSettings["coverTitle"] = prev.coverTitle
  if (ct) {
    const ctStroke = ct.stroke as
      boolean | { enabled?: boolean; width?: number; color?: string } | undefined
    const ctShadow = ct.shadow as
      | boolean
      | { enabled?: boolean; offset_x?: number; offset_y?: number; blur?: number; color?: string }
      | undefined
    const ctBg = ct.background as
      { enabled?: boolean; color?: string; padding?: number; radius?: number } | undefined
    coverTitle = {
      title: (ct.title as string | undefined) ?? prev.coverTitle?.title ?? "",
      font: (ct.font as string | undefined) ?? prev.coverTitle?.font,
      size:
        (ct.font_size as number | undefined) ??
        (ct.size as number | undefined) ??
        prev.coverTitle?.size,
      color:
        (ct.font_color as string | undefined) ??
        (ct.color as string | undefined) ??
        prev.coverTitle?.color,
      bold: (ct.bold as boolean | undefined) ?? prev.coverTitle?.bold,
      italic: (ct.italic as boolean | undefined) ?? prev.coverTitle?.italic,
      position: (ct.position as string | undefined) ?? prev.coverTitle?.position,
      stroke:
        typeof ctStroke === "object" && ctStroke
          ? ctStroke.enabled !== false
          : ((ctStroke as boolean | undefined) ?? prev.coverTitle?.stroke),
      strokeWidth:
        (typeof ctStroke === "object" && ctStroke ? ctStroke.width : undefined) ??
        (ct.stroke_width as number | undefined) ??
        prev.coverTitle?.strokeWidth,
      strokeColor:
        (typeof ctStroke === "object" && ctStroke ? ctStroke.color : undefined) ??
        (ct.stroke_color as string | undefined) ??
        prev.coverTitle?.strokeColor,
      shadow:
        typeof ctShadow === "object" && ctShadow
          ? ctShadow.enabled !== false
          : ((ctShadow as boolean | undefined) ?? prev.coverTitle?.shadow),
      shadowOffsetX:
        (typeof ctShadow === "object" && ctShadow ? ctShadow.offset_x : undefined) ??
        (ct.shadow_offset_x as number | undefined) ??
        prev.coverTitle?.shadowOffsetX,
      shadowOffsetY:
        (typeof ctShadow === "object" && ctShadow ? ctShadow.offset_y : undefined) ??
        (ct.shadow_offset_y as number | undefined) ??
        prev.coverTitle?.shadowOffsetY,
      shadowBlur:
        (typeof ctShadow === "object" && ctShadow ? ctShadow.blur : undefined) ??
        (ct.shadow_blur as number | undefined) ??
        prev.coverTitle?.shadowBlur,
      shadowColor:
        (typeof ctShadow === "object" && ctShadow ? ctShadow.color : undefined) ??
        (ct.shadow_color as string | undefined) ??
        prev.coverTitle?.shadowColor,
      bgEnabled:
        ctBg?.enabled ?? (ct.bg_enabled as boolean | undefined) ?? prev.coverTitle?.bgEnabled,
      bgColor: ctBg?.color ?? (ct.bg_color as string | undefined) ?? prev.coverTitle?.bgColor,
      bgPadding:
        ctBg?.padding ?? (ct.bg_padding as number | undefined) ?? prev.coverTitle?.bgPadding,
      bgRadius: ctBg?.radius ?? (ct.bg_radius as number | undefined) ?? prev.coverTitle?.bgRadius,
    }
  }

  const result: TitleSettings = {
    ...prev,
    title: (tc.content as string | undefined) || prev.title,
    aiAutoSelect: (tc.ai_auto_select as boolean | undefined) || false,
    position: prev.position,
    font: (tc.font_preset as string | undefined) || prev.font,
    size: (tc.font_size as number | undefined) || prev.size,
    color: (tc.font_color as string | undefined) || prev.color,
    bold: (tc.bold as boolean | undefined) ?? prev.bold,
    italic: (tc.italic as boolean | undefined) ?? prev.italic,
    stroke: strokeEnabled ?? prev.stroke,
    strokeWidth: strokeW ?? prev.strokeWidth,
    strokeColor: strokeC ?? prev.strokeColor,
    shadow: shadowEnabled ?? prev.shadow,
    shadowOffsetX: shOffX ?? prev.shadowOffsetX,
    shadowOffsetY: shOffY ?? prev.shadowOffsetY,
    shadowBlur: shBlur ?? prev.shadowBlur,
    shadowColor: shColor ?? prev.shadowColor,
    lineHeight: (tc.line_height as number | undefined) ?? prev.lineHeight,
    marginTop: (tc.margin_top as number | undefined) ?? prev.marginTop,
    maxCharsPerLine: (tc.max_chars_per_line as number | undefined) ?? prev.maxCharsPerLine,
    bgEnabled: bgEnabled ?? prev.bgEnabled,
    bgColor: bgColor ?? prev.bgColor,
    bgPadding: bgPadding ?? prev.bgPadding,
    bgRadius: bgRadius ?? prev.bgRadius,
    lineOverrides: ((tc.line_overrides as unknown[] | undefined) ?? []) as TitleLineOverride[],
    coverTitle,
  }
  return result
}

/**
 * 从 URL 参数或编辑计划 ID 加载表单配置
 */
export function usePlanConfigLoader({
  editPlanId,
  planConfigStr,
  setTitleSettings,
  setCoverSettings,
  setSelectedMaterials,
}: UsePlanConfigLoaderOptions) {
  /** 解析 plan_config 并自动填充表单 */
  useEffect(() => {
    if (!planConfigStr) return
    try {
      const config = JSON.parse(planConfigStr) as {
        title_config?: Record<string, unknown>
        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 & Record<string, unknown>
        setTitleSettings((prev: TitleSettings) => mapTitleCfgToSettings(prev, tc))
      }
      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, setTitleSettings, setSelectedMaterials])

  /** 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: TitleSettings) => ({ ...prev, title: plan.name }))
        const cfg = plan.config
        if (cfg?.title_config) {
          const tc2 = cfg.title_config as unknown as TitleConfig & Record<string, unknown>
          setTitleSettings((prev: TitleSettings) => mapTitleCfgToSettings(prev, tc2))
        }
        if (cfg?.cover_config) {
          const cc = cfg.cover_config as CoverConfig
          setCoverSettings((prev: CoverConfig) => ({
            ...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, setTitleSettings, setCoverSettings, setSelectedMaterials])
}