/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 { Select, SelectOption, SelectVariant } from "@patternfly/react-core/deprecated";
import * as React from "react";
import { useCallback, useEffect, useMemo } from "react";
import * as ReactTable from "react-table";
import {
  Action,
  BeeTableCellProps,
  BeeTableContextMenuAllowedOperationsConditions,
  BeeTableHeaderVisibility,
  BeeTableOperation,
  BeeTableOperationConfig,
  BeeTableProps,
  BoxedFunction,
  BoxedFunctionKind,
  DmnBuiltInDataType,
  ExpressionChangedArgs,
  generateUuid,
  Normalized,
} from "../../api";
import { useBoxedExpressionEditorI18n } from "../../i18n";
import { usePublishedBeeTableResizableColumns } from "../../resizing/BeeTableResizableColumnsContext";
import { useApportionedColumnWidthsIfNestedTable } from "../../resizing/Hooks";
import { ResizerStopBehavior } from "../../resizing/ResizingWidthsContext";
import {
  PMML_FUNCTION_EXPRESSION_EXTRA_WIDTH,
  PMML_FUNCTION_EXPRESSION_LABEL_MIN_WIDTH,
  PMML_FUNCTION_EXPRESSION_VALUES_MIN_WIDTH,
} from "../../resizing/WidthConstants";
import { useBeeTableSelectableCellRef } from "../../selection/BeeTableSelectionContext";
import { BeeTable, BeeTableColumnUpdate, BeeTableRef } from "../../table/BeeTable";
import { useBoxedExpressionEditor, useBoxedExpressionEditorDispatch } from "../../BoxedExpressionEditorContext";
import { DEFAULT_EXPRESSION_VARIABLE_NAME } from "../../expressionVariable/ExpressionVariableMenu";
import { useFunctionExpressionControllerCell, useFunctionExpressionParametersColumnHeader } from "./FunctionExpression";
import {
  DMN_LATEST__tContext,
  DMN_LATEST__tContextEntry,
  DMN_LATEST__tFunctionDefinition,
  DMN_LATEST__tLiteralExpression,
} from "@kie-tools/dmn-marshaller";
import "./PmmlFunctionExpression.css";

export type BoxedFunctionPmml = DMN_LATEST__tFunctionDefinition & {
  "@_kind": "PMML";
  __$$element: "functionDefinition";
};

type PMML_ROWTYPE = {
  value: string;
  label: string;
  pmmlFunctionExpression: Normalized<BoxedFunctionPmml>;
};

export function PmmlFunctionExpression({
  functionExpression,
  isNested,
}: {
  functionExpression: Normalized<BoxedFunctionPmml>;
  isNested: boolean;
}) {
  const { i18n } = useBoxedExpressionEditorI18n();
  const { expressionHolderId, isReadOnly } = useBoxedExpressionEditor();
  const { setExpression } = useBoxedExpressionEditorDispatch();

  const parametersColumnHeader = useFunctionExpressionParametersColumnHeader(
    functionExpression.formalParameter,
    isReadOnly ?? false
  );
  const parametersId = useMemo(
    () => (functionExpression["@_id"] ? `${functionExpression["@_id"]}-parameters` : "parameters"),
    [functionExpression]
  );

  const beeTableColumns = useMemo<ReactTable.Column<PMML_ROWTYPE>[]>(() => {
    return [
      {
        accessor: expressionHolderId as any, // FIXME: https://github.com/apache/incubator-kie-issues/issues/169
        label: functionExpression["@_label"] ?? DEFAULT_EXPRESSION_VARIABLE_NAME,
        dataType: functionExpression["@_typeRef"] ?? DmnBuiltInDataType.Undefined,
        isRowIndexColumn: false,
        width: undefined,
        columns: [
          {
            headerCellElement: parametersColumnHeader,
            accessor: parametersId as any,
            label: i18n.parameters,
            isRowIndexColumn: false,
            dataType: undefined as any,
            width: undefined,
            columns: [
              {
                label: i18n.label,
                accessor: "label" as any,
                dataType: undefined as any,
                isRowIndexColumn: false,
                isWidthPinned: true,
                isWidthConstant: true,
                width: PMML_FUNCTION_EXPRESSION_LABEL_MIN_WIDTH,
                minWidth: PMML_FUNCTION_EXPRESSION_LABEL_MIN_WIDTH,
              },
              {
                label: i18n.value,
                accessor: "value" as any,
                dataType: undefined as any,
                isRowIndexColumn: false,
                isWidthConstant: true,
                width: PMML_FUNCTION_EXPRESSION_VALUES_MIN_WIDTH,
                minWidth: PMML_FUNCTION_EXPRESSION_VALUES_MIN_WIDTH,
              },
            ],
          },
        ],
      },
    ];
  }, [
    expressionHolderId,
    functionExpression,
    i18n.label,
    i18n.parameters,
    i18n.value,
    parametersColumnHeader,
    parametersId,
  ]);

  const headerVisibility = useMemo(() => {
    return isNested ? BeeTableHeaderVisibility.SecondToLastLevel : BeeTableHeaderVisibility.AllLevels;
  }, [isNested]);

  const onColumnUpdates = useCallback(
    ([{ name, typeRef: dataType }]: BeeTableColumnUpdate<PMML_ROWTYPE>[]) => {
      const expressionChangedArgs: ExpressionChangedArgs = {
        action: Action.VariableChanged,
        variableUuid: expressionHolderId,
        typeChange:
          dataType !== functionExpression["@_typeRef"]
            ? {
                from: functionExpression["@_typeRef"] ?? "",
                to: dataType,
              }
            : undefined,
        nameChange:
          name !== functionExpression["@_label"]
            ? {
                from: functionExpression["@_label"] ?? "",
                to: name,
              }
            : undefined,
      };

      setExpression({
        setExpressionAction: (prev: Normalized<BoxedFunctionPmml>) => {
          // Do not inline this variable for type safety. See https://github.com/microsoft/TypeScript/issues/241
          const ret: Normalized<BoxedFunctionPmml> = {
            ...prev,
            "@_label": name,
            "@_typeRef": dataType,
          };

          return ret;
        },
        expressionChangedArgs,
      });
    },
    [expressionHolderId, functionExpression, setExpression]
  );

  const beeTableOperationConfig = useMemo<BeeTableOperationConfig>(() => {
    return [
      {
        group: i18n.terms.selection.toUpperCase(),
        items: [{ name: i18n.terms.copy, type: BeeTableOperation.SelectionCopy }],
      },
      {
        group: i18n.function.toUpperCase(),
        items: [{ name: i18n.rowOperations.reset, type: BeeTableOperation.RowReset }],
      },
    ];
  }, [i18n]);

  const getDocument = useCallback(() => {
    return (functionExpression.expression as DMN_LATEST__tContext).contextEntry?.find(
      ({ variable }) => variable?.["@_name"] === "document"
    );
  }, [functionExpression.expression]);

  const getModel = useCallback(() => {
    return (functionExpression.expression as DMN_LATEST__tContext).contextEntry?.find(
      ({ variable }) => variable?.["@_name"] === "model"
    );
  }, [functionExpression.expression]);

  const beeTableRows = useMemo(() => {
    const document = getDocument();
    const model = getModel();

    return [
      {
        label: "Document",
        value:
          (document?.expression as DMN_LATEST__tLiteralExpression | undefined)?.text?.__$$text.replaceAll(`"`, ``) ??
          "",
        pmmlFunctionExpression: functionExpression,
      },
      {
        label: "Model",
        value:
          (model?.expression as DMN_LATEST__tLiteralExpression | undefined)?.text?.__$$text.replaceAll(`"`, ``) ?? "",
        pmmlFunctionExpression: functionExpression,
      },
    ];
  }, [functionExpression, getDocument, getModel]);

  const controllerCell = useFunctionExpressionControllerCell(BoxedFunctionKind.Pmml);

  const getRowKey = useCallback((r: ReactTable.Row<PMML_ROWTYPE>) => {
    return r.id;
  }, []);

  const onRowReset = useCallback(() => {
    setExpression({
      setExpressionAction: (prev: Normalized<BoxedFunctionPmml>) => {
        // Do not inline this variable for type safety. See https://github.com/microsoft/TypeScript/issues/241
        const ret: Normalized<BoxedFunctionPmml> = {
          ...prev,
          expression: undefined!,
        };

        return ret;
      },
      expressionChangedArgs: { action: Action.RowReset, rowIndex: 0 },
    });
  }, [setExpression]);

  const cellComponentByColumnAccessor: BeeTableProps<PMML_ROWTYPE>["cellComponentByColumnAccessor"] = useMemo(
    () => ({
      label: (props) => <PmmlFunctionExpressionLabelCell {...props} />,
      value: (props) => <PmmlFunctionExpressionValueCell {...props} />,
    }),
    []
  );

  /// //////////////////////////////////////////////////////
  /// ///////////// RESIZING WIDTHS ////////////////////////
  /// //////////////////////////////////////////////////////

  const columns = useMemo(
    () => [
      {
        minWidth: PMML_FUNCTION_EXPRESSION_LABEL_MIN_WIDTH,
        width: PMML_FUNCTION_EXPRESSION_LABEL_MIN_WIDTH,
        isFrozen: true,
      },
      {
        minWidth: PMML_FUNCTION_EXPRESSION_VALUES_MIN_WIDTH,
        width: PMML_FUNCTION_EXPRESSION_VALUES_MIN_WIDTH,
      },
    ],
    []
  );

  const { onColumnResizingWidthChange, isPivoting, columnResizingWidths } = usePublishedBeeTableResizableColumns(
    functionExpression["@_id"]!,
    columns.length,
    true
  );

  const beeTableRef = React.useRef<BeeTableRef>(null);

  useApportionedColumnWidthsIfNestedTable(
    beeTableRef,
    isPivoting,
    isNested,
    PMML_FUNCTION_EXPRESSION_EXTRA_WIDTH,
    columns,
    columnResizingWidths,
    useMemo(() => [], []) // rows
  );

  /// //////////////////////////////////////////////////////

  const allowedOperations = useCallback((conditions: BeeTableContextMenuAllowedOperationsConditions) => {
    return [BeeTableOperation.SelectionCopy];
  }, []);

  return (
    <div className={`function-expression ${functionExpression["@_id"]}`}>
      <BeeTable<PMML_ROWTYPE>
        forwardRef={beeTableRef}
        isReadOnly={isReadOnly}
        onColumnResizingWidthChange={onColumnResizingWidthChange}
        resizerStopBehavior={ResizerStopBehavior.SET_WIDTH_WHEN_SMALLER}
        operationConfig={beeTableOperationConfig}
        allowedOperations={allowedOperations}
        onColumnUpdates={onColumnUpdates}
        getRowKey={getRowKey}
        onRowReset={onRowReset}
        columns={beeTableColumns}
        rows={beeTableRows}
        headerLevelCountForAppendingRowIndexColumn={2}
        skipLastHeaderGroup={true}
        cellComponentByColumnAccessor={cellComponentByColumnAccessor}
        headerVisibility={headerVisibility}
        controllerCell={controllerCell}
        shouldRenderRowIndexColumn={true}
        shouldShowRowsInlineControls={false}
        shouldShowColumnsInlineControls={false}
      />
    </div>
  );
}

const PMML_BINDING_VALUE_PLACEHOLDER = "-- None selected --";

function PmmlFunctionExpressionLabelCell(props: React.PropsWithChildren<BeeTableCellProps<PMML_ROWTYPE>>) {
  const label = useMemo(() => {
    return props.data[props.rowIndex].label;
  }, [props.data, props.rowIndex]);

  const { isActive } = useBeeTableSelectableCellRef(
    props.rowIndex,
    props.columnIndex,
    undefined,
    useCallback(() => label, [label])
  );

  const { beeGwtService } = useBoxedExpressionEditor();

  useEffect(() => {
    if (isActive) {
      beeGwtService?.selectObject("");
    }
  }, [beeGwtService, isActive]);

  return (
    <div className={"pmml-function-expression-label"}>
      <div className={"name"}>{label}</div>
      <div className={"data-type"}>{`(string)`}</div>
    </div>
  );
}

function PmmlFunctionExpressionValueCell(props: React.PropsWithChildren<BeeTableCellProps<PMML_ROWTYPE>>) {
  return props.rowIndex === 0 ? (
    <PmmlFunctionExpressionDocumentCell {...props} />
  ) : (
    <PmmlFunctionExpressionModelCell {...props} />
  );
}

function getDocumentEntry(pmmlFunction: Normalized<BoxedFunctionPmml>): Normalized<DMN_LATEST__tContextEntry> {
  return (
    (pmmlFunction.expression as Normalized<DMN_LATEST__tContext>).contextEntry?.find(
      ({ variable }) => variable?.["@_name"] === "document"
    ) ?? {
      "@_id": generateUuid(),
      expression: {
        "@_id": generateUuid(),
        __$$element: "literalExpression",
      },
    }
  );
}

function getModelEntry(pmmlFunction: Normalized<BoxedFunctionPmml>): Normalized<DMN_LATEST__tContextEntry> {
  return (
    (pmmlFunction.expression as Normalized<DMN_LATEST__tContext>).contextEntry?.find(
      ({ variable }) => variable?.["@_name"] === "model"
    ) ?? {
      "@_id": generateUuid(),
      expression: {
        "@_id": generateUuid(),
        __$$element: "literalExpression",
      },
    }
  );
}

function getUpdatedExpression(
  prev: Normalized<BoxedFunctionPmml>,
  newDocument: string,
  newModel: string
): Normalized<BoxedFunction> {
  const document = getDocumentEntry(prev);
  const model = getModelEntry(prev);

  // Do not inline this variable for type safety. See https://github.com/microsoft/TypeScript/issues/241
  const ret: Normalized<BoxedFunction> = {
    ...prev,
    expression: {
      "@_id": generateUuid(),
      __$$element: "context",
      ...(prev.expression as DMN_LATEST__tContext),
      contextEntry: [
        {
          ...document,
          variable: {
            "@_id": generateUuid(),
            "@_name": "document",
          },
          expression: {
            "@_id": generateUuid(),
            __$$element: "literalExpression",
            text: { __$$text: newDocument },
          },
        },
        {
          ...model,
          variable: {
            "@_id": generateUuid(),
            "@_name": "model",
          },
          expression: {
            "@_id": generateUuid(),
            __$$element: "literalExpression",
            text: { __$$text: newModel },
          },
        },
      ],
    },
  };

  return ret;
}

function PmmlFunctionExpressionDocumentCell(props: React.PropsWithChildren<BeeTableCellProps<PMML_ROWTYPE>>) {
  const { i18n } = useBoxedExpressionEditorI18n();
  const pmmlFunctionExpression = useMemo(
    () => props.data[props.rowIndex].pmmlFunctionExpression,
    [props.data, props.rowIndex]
  );

  const { pmmlDocuments, editorRef } = useBoxedExpressionEditor();
  const { setExpression } = useBoxedExpressionEditorDispatch();

  const contextExpression = useMemo(() => {
    if (pmmlFunctionExpression.expression?.__$$element === "context") {
      return pmmlFunctionExpression.expression;
    }
  }, [pmmlFunctionExpression.expression]);

  const pmmlDocument = useMemo(() => {
    if (contextExpression) {
      const docExpression = contextExpression.contextEntry?.find(({ variable }) => variable?.["@_name"] === "document");
      if (docExpression?.expression.__$$element === "literalExpression") {
        return docExpression?.expression.text?.__$$text;
      }
    }
  }, [contextExpression]);

  const onSelect = useCallback(
    (event, newDocument) => {
      setSelectOpen(false);
      setExpression({
        setExpressionAction: (prev: Normalized<BoxedFunctionPmml>) => {
          return getUpdatedExpression(prev, newDocument, "");
        },
        expressionChangedArgs: { action: Action.ExpressionCreated },
      });
    },
    [pmmlFunctionExpression, setExpression]
  );

  const [isSelectOpen, setSelectOpen] = React.useState(false);

  useBeeTableSelectableCellRef(
    props.rowIndex,
    props.columnIndex,
    undefined,
    useCallback(() => pmmlDocument ?? "", [pmmlDocument])
  );

  return (
    <Select
      className={`pmml-document-select`}
      menuAppendTo={editorRef?.current ?? "inline"}
      ouiaId="pmml-document-select"
      placeholderText={i18n.noneSelected}
      aria-placeholder={PMML_BINDING_VALUE_PLACEHOLDER}
      variant={SelectVariant.single}
      onToggle={(_event, val) => setSelectOpen(val)}
      onSelect={onSelect}
      isOpen={isSelectOpen}
      selections={[pmmlDocument]}
    >
      {(pmmlDocuments ?? []).map(({ document }) => (
        <SelectOption
          data-testid={`kie-tools--bee--pmml-${document}`}
          key={document}
          value={document}
          data-ouia-component-id={document}
        >
          {document}
        </SelectOption>
      ))}
    </Select>
  );
}

function PmmlFunctionExpressionModelCell(props: React.PropsWithChildren<BeeTableCellProps<PMML_ROWTYPE>>) {
  const { i18n } = useBoxedExpressionEditorI18n();
  const pmmlFunctionExpression = useMemo(
    () => props.data[props.rowIndex].pmmlFunctionExpression,
    [props.data, props.rowIndex]
  );

  const { pmmlDocuments, editorRef } = useBoxedExpressionEditor();

  const { setExpression } = useBoxedExpressionEditorDispatch();

  const onSelect = useCallback(
    (event, newModel) => {
      setSelectOpen(false);

      setExpression({
        setExpressionAction: (prev: Normalized<BoxedFunctionPmml>) => {
          const document = getDocumentEntry(prev);
          const currentDocument =
            document.expression?.__$$element === "literalExpression" ? document.expression.text?.__$$text ?? "" : "";

          return getUpdatedExpression(prev, currentDocument, newModel);
        },
        expressionChangedArgs: { action: Action.LiteralTextExpressionChanged, from: "", to: newModel },
      });
    },
    [setExpression]
  );

  const [isSelectOpen, setSelectOpen] = React.useState(false);

  const contextExpression = useMemo(() => {
    if (pmmlFunctionExpression.expression?.__$$element === "context") {
      return pmmlFunctionExpression.expression;
    }
  }, [pmmlFunctionExpression.expression]);

  const pmmlDocument = useMemo(() => {
    if (contextExpression) {
      const docExpression = contextExpression.contextEntry?.find(({ variable }) => variable?.["@_name"] === "document");
      if (docExpression?.expression.__$$element === "literalExpression") {
        return docExpression?.expression.text?.__$$text;
      }
    }
  }, [contextExpression]);

  const model = useMemo(() => {
    if (contextExpression) {
      const modelExpression = contextExpression.contextEntry?.find(({ variable }) => variable?.["@_name"] === "model");
      if (modelExpression?.expression.__$$element === "literalExpression") {
        return modelExpression?.expression.text?.__$$text;
      }
    }
  }, [contextExpression]);

  const models = useMemo(
    () =>
      (pmmlDocuments ?? [])
        .filter(({ document }) => document === pmmlDocument)
        .flatMap(({ modelsFromDocument }) => modelsFromDocument ?? []),
    [pmmlDocument, pmmlDocuments]
  );

  useBeeTableSelectableCellRef(
    props.rowIndex,
    props.columnIndex,
    undefined,
    useCallback(() => model ?? "", [model])
  );

  return (
    <Select
      className={`pmml-document-select`}
      menuAppendTo={editorRef?.current ?? "inline"}
      ouiaId="pmml-document-select"
      isDisabled={!pmmlDocument}
      placeholderText={pmmlDocument ? i18n.noneSelected : i18n.selectDocument}
      aria-placeholder={PMML_BINDING_VALUE_PLACEHOLDER}
      variant={SelectVariant.single}
      onToggle={(_event, val) => setSelectOpen(val)}
      onSelect={onSelect}
      isOpen={isSelectOpen}
      selections={[model]}
    >
      {models.map(({ model }) => (
        <SelectOption
          data-testid={`kie-tools--bee--pmml-${model}`}
          key={model}
          value={model}
          data-ouia-component-id={model}
        >
          {model}
        </SelectOption>
      ))}
    </Select>
  );
}