import type {
  ColumnDataType,
  ColumnUpdater,
  DatabaseBlockModel,
} from '@blocksuite/affine-model';
import { getSelectedModelsCommand } from '@blocksuite/affine-shared/commands';
import { FeatureFlagService } from '@blocksuite/affine-shared/services';
import {
  insertPositionToIndex,
  type InsertToPosition,
} from '@blocksuite/affine-shared/utils';
import {
  type DatabaseFlags,
  DataSourceBase,
  type DataViewDataType,
  type PropertyMetaConfig,
  type TypeInstance,
  type ViewManager,
  ViewManagerBase,
  type ViewMeta,
} from '@blocksuite/data-view';
import { propertyPresets } from '@blocksuite/data-view/property-presets';
import { IS_MOBILE } from '@blocksuite/global/env';
import { BlockSuiteError, ErrorCode } from '@blocksuite/global/exceptions';
import type { EditorHost } from '@blocksuite/std';
import { type BlockModel } from '@blocksuite/store';
import { computed, type ReadonlySignal, signal } from '@preact/signals-core';

import { getIcon } from './block-icons.js';
import {
  databaseBlockProperties,
  databasePropertyConverts,
} from './properties/index.js';
import {
  addProperty,
  copyCellsByProperty,
  deleteRows,
  deleteView,
  duplicateView,
  getCell,
  getProperty,
  moveViewTo,
  updateCell,
  updateCells,
  updateProperty,
  updateView,
} from './utils/block-utils.js';
import {
  databaseBlockViewConverts,
  databaseBlockViewMap,
  databaseBlockViews,
} from './views/index.js';

export class DatabaseBlockDataSource extends DataSourceBase {
  static externalProperties = signal<PropertyMetaConfig[]>([]);
  static propertiesList = computed(() => {
    return [
      ...Object.values(databaseBlockProperties),
      ...this.externalProperties.value,
    ];
  });
  static propertiesMap = computed(() => {
    return Object.fromEntries(
      this.propertiesList.value.map(v => [v.type, v as PropertyMetaConfig])
    );
  });

  private _batch = 0;

  private readonly _model: DatabaseBlockModel;

  override featureFlags$: ReadonlySignal<DatabaseFlags> = computed(() => {
    const featureFlagService = this.doc.get(FeatureFlagService);
    const flag = featureFlagService.getFlag(
      'enable_database_number_formatting'
    );
    return {
      enable_number_formatting: flag ?? false,
    };
  });

  properties$: ReadonlySignal<string[]> = computed(() => {
    const fixedPropertiesSet = new Set(this.fixedProperties$.value);
    const properties: string[] = [];
    this._model.props.columns$.value.forEach(column => {
      if (fixedPropertiesSet.has(column.type)) {
        fixedPropertiesSet.delete(column.type);
      }
      properties.push(column.id);
    });

    const result = [...fixedPropertiesSet, ...properties];
    return result;
  });

  readonly$: ReadonlySignal<boolean> = computed(() => {
    return (
      this._model.doc.readonly ||
      // TODO(@L-Sun): use block level readonly
      IS_MOBILE
    );
  });

  rows$: ReadonlySignal<string[]> = computed(() => {
    return this._model.children.map(v => v.id);
  });

  viewConverts = databaseBlockViewConverts;

  viewDataList$: ReadonlySignal<DataViewDataType[]> = computed(() => {
    return this._model.props.views$.value as DataViewDataType[];
  });

  override viewManager: ViewManager = new ViewManagerBase(this);

  viewMetas = databaseBlockViews;

  get doc() {
    return this._model.doc;
  }

  allPropertyMetas$ = computed<PropertyMetaConfig<any, any, any, any>[]>(() => {
    return DatabaseBlockDataSource.propertiesList.value;
  });

  propertyMetas$ = computed<PropertyMetaConfig[]>(() => {
    return this.allPropertyMetas$.value.filter(
      v => !v.config.fixed && !v.config.hide
    );
  });

  constructor(model: DatabaseBlockModel) {
    super();
    this._model = model;
  }

  private _runCapture() {
    if (this._batch) {
      return;
    }

    this._batch = requestAnimationFrame(() => {
      this.doc.captureSync();
      this._batch = 0;
    });
  }

  private getModelById(rowId: string): BlockModel | undefined {
    return this._model.children[this._model.childMap.value.get(rowId) ?? -1];
  }

  private newPropertyName() {
    let i = 1;
    while (
      this._model.props.columns$.value.some(
        column => column.name === `Column ${i}`
      )
    ) {
      i++;
    }
    return `Column ${i}`;
  }

  cellValueChange(rowId: string, propertyId: string, value: unknown): void {
    this._runCapture();

    const type = this.propertyTypeGet(propertyId);
    if (type == null) {
      return;
    }
    const update = this.propertyMetaGet(type)?.config.rawValue.setValue;
    const old = this.cellValueGet(rowId, propertyId);
    const updateFn =
      update ??
      (({ setValue, newValue }) => {
        setValue(newValue);
      });
    updateFn({
      value: old,
      data: this.propertyDataGet(propertyId),
      dataSource: this,
      newValue: value,
      setValue: newValue => {
        if (this._model.props.columns$.value.some(v => v.id === propertyId)) {
          updateCell(this._model, rowId, {
            columnId: propertyId,
            value: newValue,
          });
        }
      },
    });
  }

  cellValueGet(rowId: string, propertyId: string): unknown {
    if (propertyId === 'type') {
      const model = this.getModelById(rowId);
      if (!model) {
        return;
      }
      return getIcon(model);
    }
    const type = this.propertyTypeGet(propertyId);
    if (!type) {
      return;
    }
    if (type === 'title') {
      const model = this.getModelById(rowId);
      return model?.text;
    }
    const meta = this.propertyMetaGet(type);
    if (!meta) {
      return;
    }
    const rawValue =
      getCell(this._model, rowId, propertyId)?.value ??
      meta.config.rawValue.default();
    const schema = meta.config.rawValue.schema;
    const result = schema.safeParse(rawValue);
    if (result.success) {
      return result.data;
    }
    return;
  }

  propertyAdd(
    insertToPosition: InsertToPosition,
    type?: string
  ): string | undefined {
    this.doc.captureSync();
    const property = this.propertyMetaGet(
      type ?? propertyPresets.multiSelectPropertyConfig.type
    );
    if (!property) {
      return;
    }
    const result = addProperty(
      this._model,
      insertToPosition,
      property.create(this.newPropertyName())
    );
    return result;
  }

  protected override getNormalPropertyAndIndex(propertyId: string):
    | {
        column: ColumnDataType<Record<string, unknown>>;
        index: number;
      }
    | undefined {
    const index = this._model.props.columns$.value.findIndex(
      v => v.id === propertyId
    );
    if (index >= 0) {
      const column = this._model.props.columns$.value[index];
      if (!column) {
        return;
      }
      return {
        column,
        index,
      };
    }
    return;
  }

  private getPropertyAndIndex(propertyId: string):
    | {
        column: ColumnDataType<Record<string, unknown>>;
        index: number;
      }
    | undefined {
    const result = this.getNormalPropertyAndIndex(propertyId);
    if (result) {
      return result;
    }
    if (this.isFixedProperty(propertyId)) {
      const meta = this.propertyMetaGet(propertyId);
      if (!meta) {
        return;
      }
      const defaultData = meta.config.fixed?.defaultData ?? {};
      return {
        column: {
          data: defaultData,
          id: propertyId,
          type: propertyId,
          name: meta.config.name,
        },
        index: -1,
      };
    }
    return undefined;
  }

  private updateProperty(id: string, updater: ColumnUpdater) {
    const result = this.getPropertyAndIndex(id);
    if (!result) {
      return;
    }
    const { column: prevColumn, index } = result;
    this._model.doc.transact(() => {
      if (index >= 0) {
        const result = updater(prevColumn);
        this._model.props.columns[index] = { ...prevColumn, ...result };
      } else {
        const result = updater(prevColumn);
        this._model.props.columns = [
          ...this._model.props.columns,
          { ...prevColumn, ...result },
        ];
      }
    });
    return id;
  }

  propertyDataGet(propertyId: string): Record<string, unknown> {
    const result = this.getPropertyAndIndex(propertyId);
    if (!result) {
      return {};
    }
    return result.column.data;
  }

  propertyDataSet(propertyId: string, data: Record<string, unknown>): void {
    this._runCapture();
    this.updateProperty(propertyId, () => ({ data }));
  }

  propertyDataTypeGet(propertyId: string): TypeInstance | undefined {
    const result = this.getPropertyAndIndex(propertyId);
    if (!result) {
      return;
    }
    const { column } = result;
    const meta = this.propertyMetaGet(column.type);
    if (!meta) {
      return;
    }
    return meta.config?.jsonValue.type({
      data: column.data,
      dataSource: this,
    });
  }

  propertyDelete(id: string): void {
    if (this.isFixedProperty(id)) {
      return;
    }
    this.doc.captureSync();
    const index = this._model.props.columns.findIndex(v => v.id === id);
    if (index < 0) return;

    this.doc.transact(() => {
      this._model.props.columns = this._model.props.columns.filter(
        (_, i) => i !== index
      );
    });
  }

  propertyDuplicate(propertyId: string): string | undefined {
    if (this.isFixedProperty(propertyId)) {
      return;
    }
    this.doc.captureSync();
    const currentSchema = getProperty(this._model, propertyId);
    if (!currentSchema) {
      return;
    }
    const { id: copyId, ...nonIdProps } = currentSchema;
    const names = new Set(this._model.props.columns$.value.map(v => v.name));
    let index = 1;
    while (names.has(`${nonIdProps.name}(${index})`)) {
      index++;
    }
    const schema = { ...nonIdProps, name: `${nonIdProps.name}(${index})` };
    const id = addProperty(
      this._model,
      {
        before: false,
        id: propertyId,
      },
      schema
    );
    copyCellsByProperty(this._model, copyId, id);
    return id;
  }

  propertyMetaGet(type: string): PropertyMetaConfig | undefined {
    return DatabaseBlockDataSource.propertiesMap.value[type];
  }

  propertyNameGet(propertyId: string): string {
    if (propertyId === 'type') {
      return 'Block Type';
    }
    const result = this.getPropertyAndIndex(propertyId);
    if (!result) {
      return '';
    }
    return result.column.name;
  }

  propertyNameSet(propertyId: string, name: string): void {
    this.doc.captureSync();
    this.updateProperty(propertyId, () => ({ name }));
  }

  override propertyReadonlyGet(propertyId: string): boolean {
    if (propertyId === 'type') return true;
    return false;
  }

  propertyTypeGet(propertyId: string): string | undefined {
    if (propertyId === 'type') {
      return 'image';
    }
    const result = this.getPropertyAndIndex(propertyId);
    if (!result) {
      return;
    }
    return result.column.type;
  }

  propertyTypeSet(propertyId: string, toType: string): void {
    if (this.isFixedProperty(propertyId)) {
      return;
    }
    const meta = this.propertyMetaGet(toType);
    if (!meta) {
      return;
    }
    const currentType = this.propertyTypeGet(propertyId);
    const currentData = this.propertyDataGet(propertyId);
    const rows = this.rows$.value;
    const currentCells = rows.map(rowId =>
      this.cellValueGet(rowId, propertyId)
    );
    const convertFunction = databasePropertyConverts.find(
      v => v.from === currentType && v.to === toType
    )?.convert;
    const result = convertFunction?.(
      currentData as any,

      currentCells as any
    ) ?? {
      property: meta.config.propertyData.default(),
      cells: currentCells.map(() => undefined),
    };
    this.doc.captureSync();
    updateProperty(this._model, propertyId, () => ({
      type: toType,
      data: result.property,
    }));
    const cells: Record<string, unknown> = {};
    currentCells.forEach((value, i) => {
      if (value != null || result.cells[i] != null) {
        const rowId = rows[i];
        if (rowId) {
          cells[rowId] = result.cells[i];
        }
      }
    });
    updateCells(this._model, propertyId, cells);
  }

  rowAdd(insertPosition: InsertToPosition | number): string {
    this.doc.captureSync();
    const index =
      typeof insertPosition === 'number'
        ? insertPosition
        : insertPositionToIndex(insertPosition, this._model.children);
    return this.doc.addBlock('affine:paragraph', {}, this._model.id, index);
  }

  rowDelete(ids: string[]): void {
    this.doc.captureSync();
    for (const id of ids) {
      const block = this.doc.getBlock(id);
      if (block) {
        this.doc.deleteBlock(block.model);
      }
    }
    deleteRows(this._model, ids);
  }

  rowMove(rowId: string, position: InsertToPosition): void {
    const model = this.doc.getModelById(rowId);
    if (model) {
      const index = insertPositionToIndex(position, this._model.children);
      const target = this._model.children[index];
      if (target?.id === rowId) {
        return;
      }
      this.doc.moveBlocks([model], this._model, target);
    }
  }

  viewDataAdd(viewData: DataViewDataType): string {
    this._model.doc.captureSync();
    this._model.doc.transact(() => {
      this._model.props.views = [...this._model.props.views, viewData];
    });
    return viewData.id;
  }

  viewDataDelete(viewId: string): void {
    this._model.doc.captureSync();
    deleteView(this._model, viewId);
  }

  viewDataDuplicate(id: string): string {
    return duplicateView(this._model, id);
  }

  viewDataGet(viewId: string): DataViewDataType | undefined {
    return this.viewDataList$.value.find(data => data.id === viewId)!;
  }

  viewDataMoveTo(id: string, position: InsertToPosition): void {
    moveViewTo(this._model, id, position);
  }

  viewDataUpdate<ViewData extends DataViewDataType>(
    id: string,
    updater: (data: ViewData) => Partial<ViewData>
  ): void {
    updateView(this._model, id, updater);
  }

  viewMetaGet(type: string): ViewMeta {
    const view = databaseBlockViewMap[type];
    if (!view) {
      throw new BlockSuiteError(
        ErrorCode.DatabaseBlockError,
        `Unknown view type: ${type}`
      );
    }
    return view;
  }

  viewMetaGetById(viewId: string): ViewMeta | undefined {
    const view = this.viewDataGet(viewId);
    if (!view) {
      return;
    }
    return this.viewMetaGet(view.mode);
  }
}

export const databaseViewInitTemplate = (
  datasource: DatabaseBlockDataSource,
  viewType: string
) => {
  Array.from({ length: 3 }).forEach(() => {
    datasource.rowAdd('end');
  });
  datasource.viewManager.viewAdd(viewType);
};
export const convertToDatabase = (host: EditorHost, viewType: string) => {
  const [_, ctx] = host.std.command.exec(getSelectedModelsCommand, {
    types: ['block', 'text'],
  });
  const { selectedModels } = ctx;
  const firstModel = selectedModels?.[0];
  if (!firstModel) return;

  host.doc.captureSync();

  const parentModel = host.doc.getParent(firstModel);
  if (!parentModel) {
    return;
  }

  const id = host.doc.addBlock(
    'affine:database',
    {},
    parentModel,
    parentModel.children.indexOf(firstModel)
  );
  const databaseModel = host.doc.getBlock(id)?.model as
    | DatabaseBlockModel
    | undefined;
  if (!databaseModel) {
    return;
  }
  const datasource = new DatabaseBlockDataSource(databaseModel);
  datasource.viewManager.viewAdd(viewType);
  host.doc.moveBlocks(selectedModels, databaseModel);

  const selectionManager = host.selection;
  selectionManager.clear();
};