/*
 * Copyright 2021-2024 Avaiga Private Limited
 *
 * 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 React, {
    useState,
    useCallback,
    useEffect,
    useMemo,
    CSSProperties,
    MouseEvent,
    ChangeEvent,
    SyntheticEvent,
} from "react";
import Autocomplete, { createFilterOptions } from "@mui/material/Autocomplete";
import Box from "@mui/material/Box";
import Input from "@mui/material/Input";
import TableCell, { TableCellProps } from "@mui/material/TableCell";
import Switch from "@mui/material/Switch";
import IconButton from "@mui/material/IconButton";
import CheckIcon from "@mui/icons-material/Check";
import ClearIcon from "@mui/icons-material/Clear";
import EditIcon from "@mui/icons-material/Edit";
import DeleteIcon from "@mui/icons-material/Delete";
import { DatePicker } from "@mui/x-date-pickers/DatePicker";
import { DateTimePicker } from "@mui/x-date-pickers/DateTimePicker";
import { BaseDateTimePickerSlotsComponentsProps } from "@mui/x-date-pickers/DateTimePicker/shared";
import { isValid } from "date-fns";

import { FormatConfig } from "../../context/taipyReducers";
import { dateToString, getDateTime, getDateTimeString, getNumberString, getTimeZonedDate } from "../../utils/index";
import { TaipyActiveProps, TaipyMultiSelectProps, getSuffixedClassNames } from "./utils";
import { FilterOptionsState, TextField } from "@mui/material";

/**
 * A column description as received by the backend.
 */
export interface ColumnDesc {
    /** The unique column identifier. */
    dfid: string;
    /** The column type. */
    type: string;
    /** The value format. */
    format?: string;
    /** The column title. */
    title?: string;
    /** The order of the column. */
    index: number;
    /** The column width. */
    width?: number | string;
    /** If true, the column cannot be edited. */
    notEditable?: boolean;
    /** The name of the column that holds the CSS classname to
     *  apply to the cells. */
    style?: string;
    /** The name of the column that holds the tooltip to
     *  show on the cells. */
    tooltip?: string;
    /** The value that would replace a NaN value. */
    nanValue?: string;
    /** The TimeZone identifier used if the type is `date`. */
    tz?: string;
    /** The flag that allows filtering. */
    filter?: boolean;
    /** The name of the aggregation function. */
    apply?: string;
    /** The flag that allows the user to aggregate the column. */
    groupBy?: boolean;
    widthHint?: number;
    /** The list of values that can be used on edit. */
    lov?: string[];
    /** If true the user can enter any value besides the lov values. */
    freeLov?: boolean;
}

export const DEFAULT_SIZE = "small";

export type Order = "asc" | "desc";

/**
 * A cell value type.
 */
export type RowValue = string | number | boolean | null;

/**
 * The definition of a table row.
 *
 * A row definition associates a name (a string) to a type (a {@link RowValue}).
 */
export type RowType = Record<string, RowValue>;

export const EDIT_COL = "taipy_edit";

export const LINE_STYLE = "__taipy_line_style__";

export const defaultDateFormat = "yyyy/MM/dd";

// eslint-disable-next-line @typescript-eslint/no-explicit-any
export type TableValueType = Record<string, Record<string, any>>;

export interface TaipyTableProps extends TaipyActiveProps, TaipyMultiSelectProps {
    data?: TableValueType;
    columns?: string;
    defaultColumns: string;
    height?: string;
    width?: string;
    pageSize?: number;
    onEdit?: string;
    onDelete?: string;
    onAdd?: string;
    onAction?: string;
    editable?: boolean;
    defaultEditable?: boolean;
    lineStyle?: string;
    tooltip?: string;
    cellTooltip?: string;
    nanValue?: string;
    filter?: boolean;
    size?: "small" | "medium";
    defaultKey?: string; // for testing purposes only
    userData?: unknown;
}

export type PageSizeOptionsType = (
    | number
    | {
          value: number;
          label: string;
      }
)[];

export interface TaipyPaginatedTableProps extends TaipyTableProps {
    pageSizeOptions?: string;
    allowAllRows?: boolean;
    showAll?: boolean;
}

export const baseBoxSx = { width: "100%" };
export const paperSx = { width: "100%", mb: 2 };
export const tableSx = { minWidth: 250 };
export const headBoxSx = { display: "flex", alignItems: "flex-start" };
export const iconInRowSx = { fontSize: "body2.fontSize" };
export const iconsWrapperSx = { gridColumnStart: 2, display: "flex", alignItems: "center" } as CSSProperties;
const cellBoxSx = { display: "grid", gridTemplateColumns: "1fr auto", alignItems: "center" } as CSSProperties;
const tableFontSx = { fontSize: "body2.fontSize" };

export interface OnCellValidation {
    (value: RowValue, rowIndex: number, colName: string, userValue: string, tz?: string): void;
}

export interface OnRowDeletion {
    (rowIndex: number): void;
}

export interface OnRowSelection {
    (rowIndex: number, colName?: string): void;
}

export interface OnRowClick {
    (e: MouseEvent<HTMLTableRowElement>): void;
}

interface EditableCellProps {
    rowIndex: number;
    value: RowValue;
    colDesc: ColumnDesc;
    formatConfig: FormatConfig;
    onValidation?: OnCellValidation;
    onDeletion?: OnRowDeletion;
    onSelection?: OnRowSelection;
    nanValue?: string;
    className?: string;
    tooltip?: string;
    tableCellProps?: Partial<TableCellProps>;
}

export const defaultColumns = {} as Record<string, ColumnDesc>;

export const getsortByIndex = (cols: Record<string, ColumnDesc>) => (key1: string, key2: string) =>
    cols[key1].index < cols[key2].index ? -1 : cols[key1].index > cols[key2].index ? 1 : 0;

const formatValue = (val: RowValue, col: ColumnDesc, formatConf: FormatConfig, nanValue?: string): string => {
    if (val === undefined) {
        return "";
    }
    switch (col.type) {
        case "datetime":
            if (val === "NaT") {
                return nanValue || "";
            }
            return val ? getDateTimeString(val as string, col.format || defaultDateFormat, formatConf, col.tz) : "";
        case "int":
        case "float":
            if (val === null) {
                return nanValue || "";
            }
            return getNumberString(val as number, col.format, formatConf);
        default:
            return val ? (val as string) : "";
    }
};

const VALID_BOOLEAN_STRINGS = ["true", "1", "t", "y", "yes", "yeah", "sure"];

const isBooleanTrue = (val: RowValue) =>
    typeof val == "string" ? VALID_BOOLEAN_STRINGS.some((s) => s == val.trim().toLowerCase()) : !!val;

const defaultCursor = { cursor: "default" };
const defaultCursorIcon = { ...iconInRowSx, "& .MuiSwitch-input": defaultCursor };

const renderCellValue = (val: RowValue | boolean, col: ColumnDesc, formatConf: FormatConfig, nanValue?: string) => {
    if (val !== null && val !== undefined && col.type && col.type.startsWith("bool")) {
        return <Switch checked={val as boolean} size="small" title={val ? "True" : "False"} sx={defaultCursorIcon} />;
    }
    return <span style={defaultCursor}>{formatValue(val as RowValue, col, formatConf, nanValue)}</span>;
};

const getCellProps = (col: ColumnDesc, base: Partial<TableCellProps> = {}): Partial<TableCellProps> => {
    switch (col.type) {
        case "bool":
            base.align = "center";
            break;
    }
    if (col.width) {
        base.width = col.width;
    }
    return base;
};

export const getRowIndex = (row: Record<string, RowValue>, rowIndex: number, startIndex = 0) =>
    typeof row["_tp_index"] === "number" ? row["_tp_index"] : rowIndex + startIndex;

export const addDeleteColumn = (nbToRender: number, columns: Record<string, ColumnDesc>) => {
    if (nbToRender) {
        Object.keys(columns).forEach((key) => columns[key].index++);
        columns[EDIT_COL] = {
            dfid: EDIT_COL,
            type: "",
            format: "",
            title: "",
            index: 0,
            width: nbToRender * 4 + "em",
            filter: false,
        };
    }
    return columns;
};

export const getClassName = (row: Record<string, unknown>, style?: string, col?: string) =>
    style ? (((col && row[`tps__${col}__${style}`]) || row[style]) as string) : undefined;

export const getTooltip = (row: Record<string, unknown>, tooltip?: string, col?: string) =>
    tooltip ? (((col && row[`tpt__${col}__${tooltip}`]) || row[tooltip]) as string) : undefined;

const setInputFocus = (input: HTMLInputElement) => input && input.focus();

const textFieldProps = { textField: { margin: "dense" } } as BaseDateTimePickerSlotsComponentsProps<Date>;

const filter = createFilterOptions<string>();
const getOptionKey = (option: string) => (Array.isArray(option) ? option[0] : option);
const getOptionLabel = (option: string) => (Array.isArray(option) ? option[1] : option);

export const EditableCell = (props: EditableCellProps) => {
    const {
        onValidation,
        value,
        colDesc,
        formatConfig,
        rowIndex,
        onDeletion,
        onSelection,
        nanValue,
        className,
        tooltip,
        tableCellProps = {},
    } = props;
    const [val, setVal] = useState<RowValue | Date>(value);
    const [edit, setEdit] = useState(false);
    const [deletion, setDeletion] = useState(false);

    const onChange = useCallback((e: ChangeEvent<HTMLInputElement>) => setVal(e.target.value), []);
    const onCompleteChange = useCallback((e: SyntheticEvent, value: string | null) => setVal(value), []);
    const onBoolChange = useCallback((e: ChangeEvent<HTMLInputElement>) => setVal(e.target.checked), []);
    const onDateChange = useCallback((date: Date | null) => setVal(date), []);

    const withTime = useMemo(() => !!colDesc.format && colDesc.format.toLowerCase().includes("h"), [colDesc.format]);

    const onCheckClick = useCallback(() => {
        let castedVal = val;
        switch (colDesc.type) {
            case "bool":
                castedVal = isBooleanTrue(val as RowValue);
                break;
            case "int":
                try {
                    castedVal = parseInt(val as string, 10);
                } catch (e) {
                    // ignore
                }
                break;
            case "float":
                try {
                    castedVal = parseFloat(val as string);
                } catch (e) {
                    // ignore
                }
                break;
            case "datetime":
                if (val === null) {
                    castedVal = val;
                } else if (isValid(val)) {
                    castedVal = dateToString(getTimeZonedDate(val as Date, formatConfig.timeZone, withTime), withTime);
                } else {
                    return;
                }
                break;
        }
        onValidation &&
            onValidation(
                castedVal as RowValue,
                rowIndex,
                colDesc.dfid,
                val as string,
                colDesc.type == "datetime" ? formatConfig.timeZone : undefined
            );
        setEdit((e) => !e);
    }, [onValidation, val, rowIndex, colDesc.dfid, colDesc.type, formatConfig.timeZone, withTime]);

    const onEditClick = useCallback(
        (evt?: MouseEvent) => {
            evt && evt.stopPropagation();
            colDesc.type?.startsWith("date")
                ? setVal(getDateTime(value as string, formatConfig.timeZone, withTime))
                : setVal(value);
            onValidation && setEdit((e) => !e);
        },
        [onValidation, value, formatConfig.timeZone, colDesc.type, withTime]
    );

    const onKeyDown = useCallback(
        (e: React.KeyboardEvent<HTMLElement>) => {
            switch (e.key) {
                case "Enter":
                    onCheckClick();
                    break;
                case "Escape":
                    onEditClick();
                    break;
            }
        },
        [onCheckClick, onEditClick]
    );

    const onDeleteCheckClick = useCallback(() => {
        onDeletion && onDeletion(rowIndex);
        setDeletion((d) => !d);
    }, [onDeletion, rowIndex]);

    const onDeleteClick = useCallback(
        (evt?: MouseEvent) => {
            evt && evt.stopPropagation();
            onDeletion && setDeletion((d) => !d);
        },
        [onDeletion]
    );

    const onDeleteKeyDown = useCallback(
        (e: React.KeyboardEvent<HTMLInputElement>) => {
            switch (e.key) {
                case "Enter":
                    onDeleteCheckClick();
                    break;
                case "Escape":
                    onDeleteClick();
                    break;
            }
        },
        [onDeleteCheckClick, onDeleteClick]
    );

    const onSelect = useCallback(
        (e: MouseEvent<HTMLDivElement>) => {
            e.stopPropagation();
            onSelection && onSelection(rowIndex, colDesc.dfid);
        },
        [onSelection, rowIndex, colDesc.dfid]
    );

    const filterOptions = useCallback(
        (options: string[], params: FilterOptionsState<string>) => {
            const filtered = filter(options, params);
            if (colDesc.freeLov) {
                const { inputValue } = params;
                if (
                    inputValue &&
                    !options.some((option) => inputValue == (Array.isArray(option) ? option[1] : option))
                ) {
                    filtered.push(inputValue);
                }
            }
            return filtered;
        },
        [colDesc.freeLov]
    );

    useEffect(() => {
        !onValidation && setEdit(false);
    }, [onValidation]);

    return (
        <TableCell
            {...getCellProps(colDesc, tableCellProps)}
            className={
                onValidation ? getSuffixedClassNames(className || "tpc", edit ? "-editing" : "-editable") : className
            }
            title={tooltip}
        >
            {edit ? (
                colDesc.type?.startsWith("bool") ? (
                    <Box sx={cellBoxSx}>
                        <Switch
                            checked={val as boolean}
                            size="small"
                            title={val ? "True" : "False"}
                            sx={iconInRowSx}
                            onChange={onBoolChange}
                            inputRef={setInputFocus}
                        />
                        <Box sx={iconsWrapperSx}>
                            <IconButton onClick={onCheckClick} size="small" sx={iconInRowSx}>
                                <CheckIcon fontSize="inherit" />
                            </IconButton>
                            <IconButton onClick={onEditClick} size="small" sx={iconInRowSx}>
                                <ClearIcon fontSize="inherit" />
                            </IconButton>
                        </Box>
                    </Box>
                ) : colDesc.type?.startsWith("date") ? (
                    <Box sx={cellBoxSx}>
                        {withTime ? (
                            <DateTimePicker
                                value={val as Date}
                                onChange={onDateChange}
                                slotProps={textFieldProps}
                                inputRef={setInputFocus}
                                sx={tableFontSx}
                            />
                        ) : (
                            <DatePicker
                                value={val as Date}
                                onChange={onDateChange}
                                slotProps={textFieldProps}
                                inputRef={setInputFocus}
                                sx={tableFontSx}
                            />
                        )}
                        <Box sx={iconsWrapperSx}>
                            <IconButton onClick={onCheckClick} size="small" sx={iconInRowSx}>
                                <CheckIcon fontSize="inherit" />
                            </IconButton>
                            <IconButton onClick={onEditClick} size="small" sx={iconInRowSx}>
                                <ClearIcon fontSize="inherit" />
                            </IconButton>
                        </Box>
                    </Box>
                ) : colDesc.lov ? (
                    <Box sx={cellBoxSx}>
                        <Autocomplete
                            autoComplete={true}
                            fullWidth
                            selectOnFocus={!!colDesc.freeLov}
                            clearOnBlur={!!colDesc.freeLov}
                            handleHomeEndKeys={!!colDesc.freeLov}
                            options={colDesc.lov}
                            getOptionKey={getOptionKey}
                            getOptionLabel={getOptionLabel}
                            filterOptions={filterOptions}
                            freeSolo={!!colDesc.freeLov}
                            value={val as string}
                            onChange={onCompleteChange}
                            renderInput={(params) => (
                                <TextField
                                    {...params}
                                    fullWidth
                                    inputRef={setInputFocus}
                                    onChange={colDesc.freeLov ? onChange : undefined}
                                    margin="dense"
                                    variant="standard"
                                    sx={tableFontSx}
                                />
                            )}
                        />
                        <Box sx={iconsWrapperSx}>
                            <IconButton onClick={onCheckClick} size="small" sx={iconInRowSx}>
                                <CheckIcon fontSize="inherit" />
                            </IconButton>
                            <IconButton onClick={onEditClick} size="small" sx={iconInRowSx}>
                                <ClearIcon fontSize="inherit" />
                            </IconButton>
                        </Box>
                    </Box>
                ) : (
                    <Input
                        value={val}
                        onChange={onChange}
                        onKeyDown={onKeyDown}
                        inputRef={setInputFocus}
                        margin="dense"
                        sx={tableFontSx}
                        endAdornment={
                            <Box sx={iconsWrapperSx}>
                                <IconButton onClick={onCheckClick} size="small" sx={iconInRowSx}>
                                    <CheckIcon fontSize="inherit" />
                                </IconButton>
                                <IconButton onClick={onEditClick} size="small" sx={iconInRowSx}>
                                    <ClearIcon fontSize="inherit" />
                                </IconButton>
                            </Box>
                        }
                    />
                )
            ) : EDIT_COL === colDesc.dfid ? (
                deletion ? (
                    <Input
                        value="Confirm"
                        onKeyDown={onDeleteKeyDown}
                        inputRef={setInputFocus}
                        sx={tableFontSx}
                        endAdornment={
                            <Box sx={iconsWrapperSx}>
                                <IconButton onClick={onDeleteCheckClick} size="small" sx={iconInRowSx}>
                                    <CheckIcon fontSize="inherit" />
                                </IconButton>
                                <IconButton onClick={onDeleteClick} size="small" sx={iconInRowSx}>
                                    <ClearIcon fontSize="inherit" />
                                </IconButton>
                            </Box>
                        }
                    />
                ) : onDeletion ? (
                    <Box sx={iconsWrapperSx}>
                        <IconButton onClick={onDeleteClick} size="small" sx={iconInRowSx}>
                            <DeleteIcon fontSize="inherit" />
                        </IconButton>
                    </Box>
                ) : null
            ) : (
                <Box sx={cellBoxSx} onClick={onSelect}>
                    {renderCellValue(value, colDesc, formatConfig, nanValue)}
                    {onValidation ? (
                        <Box sx={iconsWrapperSx}>
                            <IconButton onClick={onEditClick} size="small" sx={iconInRowSx}>
                                <EditIcon fontSize="inherit" />
                            </IconButton>
                        </Box>
                    ) : null}
                </Box>
            )}
        </TableCell>
    );
};