import type { Instance, WebstudioFragment } from "@webstudio-is/sdk";
import {
  findClosestInsertable,
  insertInstanceChildrenMutable,
  insertWebstudioFragmentCopy,
  updateWebstudioData,
} from "../../instance-utils";
import { $project } from "../../nano-states";
import {
  WfData,
  wfNodeTypes,
  type WfNode,
  type WfStyle,
  type WfAsset,
} from "./schema";
import { addInstanceAndProperties } from "./instances-properties";
import { addStyles } from "./styles";
import { builderApi } from "~/shared/builder-api";
import { denormalizeSrcProps } from "../asset-upload";
import { nanoHash } from "~/shared/nano-hash";
import { findAvailableVariables } from "~/shared/data-variables";
import type { Plugin } from "../init-copy-paste";

const { toast } = builderApi;

const toWebstudioFragment = async (wfData: WfData) => {
  const fragment: WebstudioFragment = {
    children: [],
    instances: [],
    props: [],
    breakpoints: [],
    styles: [],
    styleSources: [],
    styleSourceSelections: [],
    dataSources: [],
    resources: [],
    assets: [],
  };

  const wfNodes = new Map<WfNode["_id"], WfNode>();
  for (const node of wfData.payload.nodes) {
    if ("type" in node || "text" in node) {
      wfNodes.set(node._id, node);
    }
  }
  const wfStyles = new Map<WfStyle["_id"], WfStyle>(
    wfData.payload.styles.map((style: WfStyle) => [style._id, style])
  );

  const wfAssets = new Map<WfAsset["_id"], WfAsset>(
    wfData.payload.assets.map((asset: WfAsset) => [asset._id, asset])
  );

  // False value used to skip a node.
  const doneNodes = new Map<WfNode["_id"], Instance["id"] | false>();
  for (const wfNode of wfNodes.values()) {
    addInstanceAndProperties(wfNode, doneNodes, wfNodes, fragment);
  }

  /**
   * Generates deterministic style IDs based on sourceId or unique data.
   * This simplifies merging and deduplicating styles from different sources.
   */
  const generateStyleSourceId = async (sourceData: string) => {
    // We are using projectId here to avoid id collisions between different projects.
    const projectId = $project.get()?.id;
    if (projectId === undefined) {
      throw new Error("Project id is not set");
    }
    return nanoHash(`${projectId}-${sourceData}`);
  };

  await addStyles({
    wfNodes,
    wfStyles,
    wfAssets,
    doneNodes,
    fragment,
    generateStyleSourceId,
  });
  // First node should be always the root node in theory, if not
  // we need to find a node that is not a child of any other node.
  const rootWfNode = wfData.payload.nodes[0];
  const rootInstanceId = doneNodes.get(rootWfNode._id);
  if (rootInstanceId === false) {
    return fragment;
  }
  if (rootInstanceId === undefined) {
    console.error(`No root instance id found for node ${rootWfNode._id}`);
    return fragment;
  }
  fragment.children = [
    {
      type: "id",
      value: rootInstanceId,
    },
  ];
  return fragment;
};

const parse = (clipboardData: string) => {
  let data;
  try {
    data = JSON.parse(clipboardData);
  } catch {
    return;
  }

  if (data.type !== "@webflow/XscpData") {
    return;
  }

  const unsupportedNodeTypes: Set<string> = new Set(
    data.payload.nodes
      .filter((node: { type: string }) => {
        return (
          node.type !== undefined &&
          wfNodeTypes.includes(node.type as (typeof wfNodeTypes)[number]) ===
            false
        );
      })
      .map((node: { type: string }) => node.type)
  );

  if (unsupportedNodeTypes.size !== 0) {
    const message = `Skipping unsupported elements: ${[...unsupportedNodeTypes.values()].join(", ")}`;
    toast.info(message);
    console.info(message);
  }

  const result = WfData.safeParse(data);

  if (result.success) {
    const unpasedTypes = new Set<string>();

    for (let i = 0; i !== result.data.payload.nodes.length; ++i) {
      if ("type" in result.data.payload.nodes[i]) {
        continue;
      }

      if (data.payload.nodes[i].type === undefined) {
        continue;
      }

      const probablyUnparsedType = data.payload.nodes[i].type;

      if (unsupportedNodeTypes.has(probablyUnparsedType)) {
        continue;
      }

      unpasedTypes.add(probablyUnparsedType);
    }

    if (unpasedTypes.size !== 0) {
      const message = `The following types were skipped due to a parsing error: ${[...unpasedTypes.values()].join(", ")}`;
      toast.info(message);
      console.info(message);
    }

    return result.data;
  }

  toast.error(result.error.message);
  console.error(result.error.message);
};

const onPaste = async (clipboardData: string) => {
  const project = $project.get();
  const wfData = parse(clipboardData);
  if (wfData === undefined || project === undefined) {
    return false;
  }

  let fragment = await toWebstudioFragment(wfData);
  if (fragment === undefined) {
    return false;
  }
  fragment = await denormalizeSrcProps(fragment);

  const insertable = findClosestInsertable(fragment);
  if (insertable === undefined) {
    return false;
  }

  updateWebstudioData((data) => {
    const { newInstanceIds } = insertWebstudioFragmentCopy({
      data,
      fragment,
      availableVariables: findAvailableVariables({
        ...data,
        startingInstanceId: insertable.parentSelector[0],
      }),
      projectId: project.id,
    });

    const children = fragment.children
      .map((child) => {
        if (child.type === "id") {
          const value = newInstanceIds.get(child.value);
          if (value) {
            return { type: "id" as const, value };
          }
        }
      })
      .filter(<T>(value: T): value is NonNullable<T> => value !== undefined);

    insertInstanceChildrenMutable(data, children, insertable);
  });

  return true;
};

export const webflow: Plugin = {
  name: "webflow",
  mimeType: "application/json",
  onPaste,
};

export const __testing__ = {
  toWebstudioFragment,
};