import { atom, map, type MapStore, type ReadableAtom, type WritableAtom } from 'nanostores';
import type { EditorDocument, ScrollPosition } from '../../components/editor/codemirror/CodeMirrorEditor';
import { unreachable } from '../../utils/unreachable';
import { ActionRunner } from '../runtime/action-runner';
import type { ActionCallbackData, ArtifactCallbackData } from '../runtime/message-parser';
import { webcontainer } from '../webcontainer';
import { EditorStore } from './editor';
import { FilesStore, type FileMap } from './files';
import { PreviewsStore } from './previews';

export interface ArtifactState {
  title: string;
  closed: boolean;
  runner: ActionRunner;
}

export type ArtifactUpdateState = Pick<ArtifactState, 'title' | 'closed'>;

type Artifacts = MapStore<Record<string, ArtifactState>>;

export class WorkbenchStore {
  #previewsStore = new PreviewsStore(webcontainer);
  #filesStore = new FilesStore(webcontainer);
  #editorStore = new EditorStore(this.#filesStore);

  artifacts: Artifacts = import.meta.hot?.data.artifacts ?? map({});
  showWorkbench: WritableAtom<boolean> = import.meta.hot?.data.showWorkbench ?? atom(false);
  unsavedFiles: WritableAtom<Set<string>> = import.meta.hot?.data.unsavedFiles ?? atom(new Set<string>());
  modifiedFiles = new Set<string>();

  constructor() {
    if (import.meta.hot) {
      import.meta.hot.data.artifacts = this.artifacts;
      import.meta.hot.data.unsavedFiles = this.unsavedFiles;
      import.meta.hot.data.showWorkbench = this.showWorkbench;
    }
  }

  get previews() {
    return this.#previewsStore.previews;
  }

  get files() {
    return this.#filesStore.files;
  }

  get currentDocument(): ReadableAtom<EditorDocument | undefined> {
    return this.#editorStore.currentDocument;
  }

  get selectedFile(): ReadableAtom<string | undefined> {
    return this.#editorStore.selectedFile;
  }

  setDocuments(files: FileMap) {
    this.#editorStore.setDocuments(files);

    if (this.#filesStore.filesCount > 0 && this.currentDocument.get() === undefined) {
      // we find the first file and select it
      for (const [filePath, dirent] of Object.entries(files)) {
        if (dirent?.type === 'file') {
          this.setSelectedFile(filePath);
          break;
        }
      }
    }
  }

  setShowWorkbench(show: boolean) {
    this.showWorkbench.set(show);
  }

  setCurrentDocumentContent(newContent: string | Uint8Array) {
    const filePath = this.currentDocument.get()?.filePath;

    if (!filePath) {
      return;
    }

    const originalContent = this.#filesStore.getFile(filePath)?.content;
    const unsavedChanges = originalContent !== undefined && originalContent !== newContent;

    this.#editorStore.updateFile(filePath, newContent);

    const currentDocument = this.currentDocument.get();

    if (currentDocument) {
      const previousUnsavedFiles = this.unsavedFiles.get();

      if (unsavedChanges && previousUnsavedFiles.has(currentDocument.filePath)) {
        return;
      }

      const newUnsavedFiles = new Set(previousUnsavedFiles);

      if (unsavedChanges) {
        newUnsavedFiles.add(currentDocument.filePath);
      } else {
        newUnsavedFiles.delete(currentDocument.filePath);
      }

      this.unsavedFiles.set(newUnsavedFiles);
    }
  }

  setCurrentDocumentScrollPosition(position: ScrollPosition) {
    const editorDocument = this.currentDocument.get();

    if (!editorDocument) {
      return;
    }

    const { filePath } = editorDocument;

    this.#editorStore.updateScrollPosition(filePath, position);
  }

  setSelectedFile(filePath: string | undefined) {
    this.#editorStore.setSelectedFile(filePath);
  }

  async saveCurrentDocument() {
    const currentDocument = this.currentDocument.get();

    if (currentDocument === undefined) {
      return;
    }

    const { filePath } = currentDocument;

    await this.#filesStore.saveFile(filePath, currentDocument.value);

    const newUnsavedFiles = new Set(this.unsavedFiles.get());
    newUnsavedFiles.delete(filePath);

    this.unsavedFiles.set(newUnsavedFiles);
  }

  resetCurrentDocument() {
    const currentDocument = this.currentDocument.get();

    if (currentDocument === undefined) {
      return;
    }

    const { filePath } = currentDocument;
    const file = this.#filesStore.getFile(filePath);

    if (!file) {
      return;
    }

    this.setCurrentDocumentContent(file.content);
  }

  abortAllActions() {
    // TODO: what do we wanna do and how do we wanna recover from this?
  }

  addArtifact({ messageId, title }: ArtifactCallbackData) {
    const artifact = this.#getArtifact(messageId);

    if (artifact) {
      return;
    }

    this.artifacts.setKey(messageId, {
      title,
      closed: false,
      runner: new ActionRunner(webcontainer),
    });
  }

  updateArtifact({ messageId }: ArtifactCallbackData, state: Partial<ArtifactUpdateState>) {
    const artifact = this.#getArtifact(messageId);

    if (!artifact) {
      return;
    }

    this.artifacts.setKey(messageId, { ...artifact, ...state });
  }

  async addAction(data: ActionCallbackData) {
    const { messageId } = data;

    const artifact = this.#getArtifact(messageId);

    if (!artifact) {
      unreachable('Artifact not found');
    }

    artifact.runner.addAction(data);
  }

  async runAction(data: ActionCallbackData) {
    const { messageId } = data;

    const artifact = this.#getArtifact(messageId);

    if (!artifact) {
      unreachable('Artifact not found');
    }

    artifact.runner.runAction(data);
  }

  #getArtifact(id: string) {
    const artifacts = this.artifacts.get();
    return artifacts[id];
  }
}

export const workbenchStore = new WorkbenchStore();