/**
 * Copyright (c) 2020-present, Goldman Sachs
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import type { EditorStore } from '../../EditorStore.js';
import { FileGenerationState } from '../../editor-state/FileGenerationState.js';
import { action, flow, flowResult, makeObservable, observable } from 'mobx';
import { ElementEditorState } from './ElementEditorState.js';
import { type GeneratorFn, AssertionError, uuid } from '@finos/legend-shared';
import {
  FileGenerationSpecification,
  PackageableElementExplicitReference,
} from '@finos/legend-graph';
import {
  createObservableFileGeneration,
  fileGeneration_setType,
} from '../../../graph-modifier/DSL_Generation_GraphModifierHelper.js';
import { handlePostCreateAction } from '../../NewElementState.js';

export class ElementFileGenerationState {
  readonly uuid = uuid();
  readonly editorStore: EditorStore;
  readonly fileGenerationType: string;

  fileGenerationState: FileGenerationState;
  showNewFileGenerationModal = false;

  constructor(editorStore: EditorStore, fileGenerationType: string) {
    makeObservable(this, {
      fileGenerationState: observable,
      showNewFileGenerationModal: observable,
      setShowNewFileGenerationModal: action,
      promoteToFileGeneration: flow,
      regenerate: flow,
    });

    this.editorStore = editorStore;
    this.fileGenerationType = fileGenerationType;
    const fileGeneration = createObservableFileGeneration();
    fileGeneration_setType(fileGeneration, fileGenerationType);
    this.fileGenerationState = new FileGenerationState(
      editorStore,
      fileGeneration,
    );
  }

  setShowNewFileGenerationModal(show: boolean): void {
    this.showNewFileGenerationModal = show;
  }

  *promoteToFileGeneration(
    packagePath: string,
    name: string,
  ): GeneratorFn<void> {
    const fileGeneration = this.fileGenerationState.fileGeneration;
    fileGeneration.name = name;
    yield flowResult(
      this.editorStore.graphEditorMode.addElement(
        fileGeneration,
        packagePath,
        true,
      ),
    );
    yield handlePostCreateAction(fileGeneration, this.editorStore);
    // reset file generation state so since the current file generation is promoted to a packageable element in the graph
    // otherwise if we keep this reference, editing this element generation state will also modify the packageable element
    const newFileGeneration = new FileGenerationSpecification('');
    fileGeneration_setType(newFileGeneration, this.fileGenerationType);
    this.fileGenerationState = new FileGenerationState(
      this.editorStore,
      newFileGeneration,
    );
  }

  *regenerate(): GeneratorFn<void> {
    const currentState = this.editorStore.tabManagerState.currentTab;
    if (currentState instanceof ElementEditorState) {
      this.fileGenerationState.fileGeneration.scopeElements = [
        PackageableElementExplicitReference.create(currentState.element),
      ]; // always set the scope to the current element
      yield flowResult(this.fileGenerationState.generate());
    } else {
      throw new AssertionError(
        'Generation state must have at least an element editor opened',
      );
    }
  }
}