import {
  ASTRALVIEW_SCHEMA_VERSION,
  createEmptyScreen,
  type ImageWidgetNode,
  type IframeWidgetNode,
  type Screen,
  type TextWidgetNode,
  type VideoWidgetNode,
} from '../schema';
import { convertGoViewImageOptionToNodeProps, type GoViewImageOption } from '../widgets/image';
import { convertGoViewIframeOptionToNodeProps, type GoViewIframeOption } from '../widgets/iframe';
import { convertGoViewVideoOptionToNodeProps, type GoViewVideoOption } from '../widgets/video';
import { convertGoViewTextOptionToNodeProps, type GoViewTextOption } from '../widgets/text';

export interface GoViewComponentLike {
  id?: string;

  // some exports wrap the actual component under a nested field
  component?: GoViewComponentLike;

  // component identity
  key?: string; // e.g. "TextCommon" (sometimes)
  componentKey?: string;
  chartConfig?: {
    key?: string;
    chartKey?: string;
    type?: string;
    option?: unknown;
    data?: unknown;
  };

  // geometry
  attr?: { x: number; y: number; w: number; h: number; zIndex?: number };

  // state
  status?: { lock?: boolean; hide?: boolean };

  // widget-specific config
  option?: unknown;
}

export interface GoViewEditCanvasConfigLike {
  projectName?: string;
  width?: number;
  height?: number;
  background?: string;
}

export interface GoViewStorageLike {
  editCanvasConfig?: GoViewEditCanvasConfigLike;
  componentList?: GoViewComponentLike[];
}

export interface GoViewProjectLike {
  width?: number;
  height?: number;
  canvas?: { width?: number; height?: number };
  componentList?: GoViewComponentLike[];

  // persisted store shape (some variants)
  editCanvasConfig?: GoViewEditCanvasConfigLike;
}

function unwrapComponent(c: GoViewComponentLike): GoViewComponentLike {
  // Prefer the nested component shape but keep outer fields as fallback.
  // This handles exports like: { id, attr, component: { chartConfig, option } }
  const inner = c.component;
  if (!inner) return c;
  return {
    ...inner,
    ...c,
    // ensure the nested component doesn't get lost
    component: inner.component,
  };
}

function keyOf(cIn: GoViewComponentLike): string {
  const c = unwrapComponent(cIn);
  return (
    c.chartConfig?.key ??
    c.chartConfig?.chartKey ??
    c.chartConfig?.type ??
    c.componentKey ??
    c.key ??
    ''
  ).toLowerCase();
}

function isTextCommon(c: GoViewComponentLike): boolean {
  const k = keyOf(c);
  if (k === 'textcommon') return true;
  return k.includes('text');
}

function isImage(c: GoViewComponentLike): boolean {
  const k = keyOf(c);
  // goView variants: "Image", "image", sometimes with suffixes.
  return k === 'image' || k.includes('image') || k.includes('picture');
}

function isIframe(c: GoViewComponentLike): boolean {
  const k = keyOf(c);
  // goView variants: "Iframe", "IframeCommon", etc.
  if (k === 'iframe' || k.includes('iframe')) return true;

  // Other names seen in low-code editors for embedded web content.
  return k.includes('embed') || k.includes('web') || k.includes('html');
}

function isVideo(c: GoViewComponentLike): boolean {
  const k = keyOf(c);
  // goView variants: "Video", "VideoCommon", etc.
  if (k === 'video' || k.includes('video')) return true;

  // Other names seen in the wild.
  return k.includes('mp4') || k.includes('media') || k.includes('player');
}

function pick<T>(...values: Array<T | undefined | null>): T | undefined {
  for (const v of values) {
    if (v !== undefined && v !== null) return v as T;
  }
  return undefined;
}

function optionOf(cIn: GoViewComponentLike): unknown {
  const c = unwrapComponent(cIn);
  const chartData = c.chartConfig?.data as Record<string, unknown> | undefined;
  return (
    c.option ??
    c.chartConfig?.option ??
    chartData?.option ??
    chartData?.options ??
    chartData?.config ??
    chartData ??
    {}
  );
}

function toNumber(v: unknown, fallback: number): number {
  if (typeof v === 'number' && Number.isFinite(v)) return v;
  if (typeof v === 'string') {
    const n = Number(v);
    if (Number.isFinite(n)) return n;
  }
  return fallback;
}

export function convertGoViewProjectToScreen(input: GoViewProjectLike | GoViewStorageLike): Screen {
  // goView exports vary a lot; attempt a few common nesting shapes.
  const root = input as unknown as Record<string, unknown>;
  const data = (root.data as Record<string, unknown> | undefined) ?? undefined;
  const state = (root.state as Record<string, unknown> | undefined) ?? undefined;
  const project = (root.project as Record<string, unknown> | undefined) ?? undefined;

  const editCanvasConfig = pick<GoViewEditCanvasConfigLike>(
    (input as GoViewStorageLike).editCanvasConfig,
    data?.editCanvasConfig as GoViewEditCanvasConfigLike | undefined,
    state?.editCanvasConfig as GoViewEditCanvasConfigLike | undefined,
    project?.editCanvasConfig as GoViewEditCanvasConfigLike | undefined,
  );

  const width =
    editCanvasConfig?.width ??
    (input as GoViewProjectLike).canvas?.width ??
    (input as GoViewProjectLike).width ??
    (data?.width as number | undefined) ??
    1920;

  const height =
    editCanvasConfig?.height ??
    (input as GoViewProjectLike).canvas?.height ??
    (input as GoViewProjectLike).height ??
    (data?.height as number | undefined) ??
    1080;

  const name = editCanvasConfig?.projectName ?? 'Imported Project';
  const background = editCanvasConfig?.background;

  const screen = createEmptyScreen({
    version: ASTRALVIEW_SCHEMA_VERSION,
    width,
    height,
    name,
    background: background ? { color: background } : undefined,
    nodes: [],
  });

  const componentList =
    (input as GoViewStorageLike).componentList ??
    (input as GoViewProjectLike).componentList ??
    (data?.componentList as GoViewComponentLike[] | undefined) ??
    (state?.componentList as GoViewComponentLike[] | undefined) ??
    (project?.componentList as GoViewComponentLike[] | undefined) ??
    [];

  const nodes: Array<TextWidgetNode | ImageWidgetNode | IframeWidgetNode | VideoWidgetNode> = [];

  for (const raw of componentList) {
    const c = unwrapComponent(raw);

    const rect = c.attr
      ? {
          x: toNumber((c.attr as unknown as Record<string, unknown>).x, 0),
          y: toNumber((c.attr as unknown as Record<string, unknown>).y, 0),
          w: toNumber((c.attr as unknown as Record<string, unknown>).w, 320),
          h: toNumber((c.attr as unknown as Record<string, unknown>).h, 60),
        }
      : { x: 0, y: 0, w: 320, h: 60 };

    if (isTextCommon(c)) {
      const props = convertGoViewTextOptionToNodeProps(optionOf(c) as GoViewTextOption);
      nodes.push({
        id: c.id ?? `import_text_${Math.random().toString(16).slice(2)}`,
        type: 'text',
        rect,
        zIndex: c.attr?.zIndex === undefined ? undefined : toNumber((c.attr as unknown as Record<string, unknown>).zIndex, 0),
        locked: c.status?.lock ?? false,
        hidden: c.status?.hide ?? false,
        props,
      });
      continue;
    }

    if (isImage(c)) {
      const props = convertGoViewImageOptionToNodeProps(optionOf(c) as GoViewImageOption);
      nodes.push({
        id: c.id ?? `import_image_${Math.random().toString(16).slice(2)}`,
        type: 'image',
        rect,
        zIndex: c.attr?.zIndex === undefined ? undefined : toNumber((c.attr as unknown as Record<string, unknown>).zIndex, 0),
        locked: c.status?.lock ?? false,
        hidden: c.status?.hide ?? false,
        props,
      });
      continue;
    }

    if (isIframe(c)) {
      const props = convertGoViewIframeOptionToNodeProps(optionOf(c) as GoViewIframeOption);
      nodes.push({
        id: c.id ?? `import_iframe_${Math.random().toString(16).slice(2)}`,
        type: 'iframe',
        rect,
        zIndex: c.attr?.zIndex === undefined ? undefined : toNumber((c.attr as unknown as Record<string, unknown>).zIndex, 0),
        locked: c.status?.lock ?? false,
        hidden: c.status?.hide ?? false,
        props,
      });
      continue;
    }

    if (isVideo(c)) {
      const props = convertGoViewVideoOptionToNodeProps(optionOf(c) as GoViewVideoOption);
      nodes.push({
        id: c.id ?? `import_video_${Math.random().toString(16).slice(2)}`,
        type: 'video',
        rect,
        zIndex: c.attr?.zIndex === undefined ? undefined : toNumber((c.attr as unknown as Record<string, unknown>).zIndex, 0),
        locked: c.status?.lock ?? false,
        hidden: c.status?.hide ?? false,
        props,
      });
      continue;
    }
  }

  return {
    ...screen,
    nodes,
  };
}