'use client';

import { createColumnHelper } from '@tanstack/react-table';
import clsx from 'clsx';
import { Dispatch, useCallback, useEffect, useMemo, useState } from 'react';
import { BiCheck, BiRefresh, BiX } from 'react-icons/bi';

import ConstituentaPicker from '@/components/ConstituentaPicker';
import DataTable, { IConditionalStyle } from '@/components/DataTable';
import RSInput from '@/components/RSInput';
import MiniButton from '@/components/ui/MiniButton';
import { useConceptTheme } from '@/context/ThemeContext';
import { IConstituenta, IRSForm } from '@/models/rsform';
import { IArgumentValue } from '@/models/rslang';
import { prefixes } from '@/utils/constants';

interface ArgumentsTabProps {
  state: IArgumentsState;
  schema: IRSForm;
  partialUpdate: Dispatch<Partial<IArgumentsState>>;
}

export interface IArgumentsState {
  arguments: IArgumentValue[];
  definition: string;
}

const argumentsHelper = createColumnHelper<IArgumentValue>();

function ArgumentsTab({ state, schema, partialUpdate }: ArgumentsTabProps) {
  const { colors } = useConceptTheme();

  const [selectedCst, setSelectedCst] = useState<IConstituenta | undefined>(undefined);
  const [selectedArgument, setSelectedArgument] = useState<IArgumentValue | undefined>(undefined);

  const [argumentValue, setArgumentValue] = useState('');

  const selectedClearable = useMemo(() => {
    return argumentValue && !!selectedArgument && !!selectedArgument.value;
  }, [argumentValue, selectedArgument]);

  const isModified = useMemo(
    () => selectedArgument && argumentValue !== selectedArgument.value,
    [selectedArgument, argumentValue]
  );

  useEffect(() => {
    if (!selectedArgument && state.arguments.length > 0) {
      setSelectedArgument(state.arguments[0]);
    }
  }, [state.arguments, selectedArgument]);

  const handleSelectArgument = useCallback((arg: IArgumentValue) => {
    setSelectedArgument(arg);
    if (arg.value) {
      setArgumentValue(arg.value);
    }
  }, []);

  const handleSelectConstituenta = useCallback((cst: IConstituenta) => {
    setSelectedCst(cst);
    setArgumentValue(cst.alias);
  }, []);

  const handleClearArgument = useCallback(
    (target: IArgumentValue) => {
      const newArg = { ...target, value: '' };
      partialUpdate({
        arguments: state.arguments.map(arg => (arg.alias !== target.alias ? arg : newArg))
      });
      setSelectedArgument(newArg);
    },
    [partialUpdate, state.arguments]
  );

  const handleReset = useCallback(() => {
    setArgumentValue(selectedArgument?.value ?? '');
  }, [selectedArgument]);

  const handleAssignArgument = useCallback(
    (target: IArgumentValue, value: string) => {
      const newArg = { ...target, value: value };
      partialUpdate({
        arguments: state.arguments.map(arg => (arg.alias !== target.alias ? arg : newArg))
      });
      setSelectedArgument(newArg);
    },
    [partialUpdate, state.arguments]
  );

  const columns = useMemo(
    () => [
      argumentsHelper.accessor('alias', {
        id: 'alias',
        header: 'Имя',
        size: 40,
        minSize: 40,
        maxSize: 40,
        cell: props => <div className='text-center'>{props.getValue()}</div>
      }),
      argumentsHelper.accessor(arg => arg.value || 'свободный аргумент', {
        id: 'value',
        header: 'Значение',
        size: 200,
        minSize: 200,
        maxSize: 200
      }),
      argumentsHelper.accessor(arg => arg.typification, {
        id: 'type',
        header: 'Типизация',
        enableHiding: true,
        cell: props => (
          <div className={clsx('min-w-[9.3rem] max-w-[9.3rem]', 'text-sm break-words')}>{props.getValue()}</div>
        )
      }),
      argumentsHelper.display({
        id: 'actions',
        size: 50,
        minSize: 50,
        maxSize: 50,
        cell: props => (
          <div className='max-h-[1.2rem]'>
            {props.row.original.value ? (
              <MiniButton
                title='Очистить значение'
                icon={<BiX size='0.75rem' className='clr-text-red' />}
                noHover
                onClick={() => handleClearArgument(props.row.original)}
              />
            ) : null}
          </div>
        )
      })
    ],
    [handleClearArgument]
  );

  const conditionalRowStyles = useMemo(
    (): IConditionalStyle<IArgumentValue>[] => [
      {
        when: (arg: IArgumentValue) => arg.alias === selectedArgument?.alias,
        style: { backgroundColor: colors.bgSelected }
      }
    ],
    [selectedArgument, colors]
  );

  return (
    <>
      <DataTable
        dense
        noFooter
        className={clsx('max-h-[5.8rem] min-h-[5.8rem]', 'overflow-y-auto', 'text-sm', 'border', 'select-none')}
        data={state.arguments}
        columns={columns}
        conditionalRowStyles={conditionalRowStyles}
        noDataComponent={<p className={clsx('min-h-[3.6rem]', 'p-2', 'text-center')}>Аргументы отсутствуют</p>}
        onRowClicked={handleSelectArgument}
      />

      <div className={clsx('my-4', 'flex gap-2 justify-center items-center', 'select-none')}>
        <span
          title='Выберите аргумент из списка сверху и значение из списка снизу'
          className='font-semibold text-center'
        >
          {selectedArgument?.alias || 'ARG'}
        </span>
        <span>=</span>
        <RSInput
          noTooltip
          className='w-[12rem]'
          value={argumentValue}
          onChange={newValue => setArgumentValue(newValue)}
        />
        <div className='flex'>
          <MiniButton
            title='Подставить значение аргумента'
            icon={<BiCheck size='1.25rem' className={!!argumentValue && !!selectedArgument ? 'clr-text-green' : ''} />}
            disabled={!argumentValue || !selectedArgument}
            onClick={() => handleAssignArgument(selectedArgument!, argumentValue)}
          />
          <MiniButton
            title='Откатить значение'
            disabled={!isModified}
            onClick={handleReset}
            icon={<BiRefresh size='1.25rem' className={isModified ? 'clr-text-primary' : ''} />}
          />
          <MiniButton
            title='Очистить значение аргумента'
            disabled={!selectedClearable}
            icon={<BiX size='1.25rem' className={selectedClearable ? 'clr-text-red' : ''} />}
            onClick={() => (selectedArgument ? handleClearArgument(selectedArgument) : undefined)}
          />
        </div>
      </div>

      <ConstituentaPicker
        value={selectedCst}
        data={schema?.items}
        onSelectValue={handleSelectConstituenta}
        prefixID={prefixes.cst_modal_list}
        rows={7}
      />

      <RSInput
        disabled
        id='result'
        placeholder='Итоговое определение'
        className='mt-[1.2rem]'
        height='5.1rem'
        value={state.definition}
      />
    </>
  );
}

export default ArgumentsTab;