import {
  createLiteral,
  createLocalName,
  createUnaryExpression,
} from '@src/lang/create'
import type { PrevVariable } from '@src/lang/queryAst'
import type { BinaryPart } from '@src/lang/wasm'

export const AvailableVars = ({
  onVarClick,
  prevVariables,
}: {
  onVarClick: (a: string) => void
  prevVariables: PrevVariable<any>[]
}) => {
  return (
    <ul className="flex flex-col">
      {prevVariables.length &&
        prevVariables.map(({ key, value }) => (
          <li key={key}>
            <button
              className="flex w-full justify-between items-center rounded-md hover:bg-gray-100 max-w-xs"
              onClick={() => onVarClick(key)}
            >
              <span className="font-[monospace] text-gray-800">{key}</span>{' '}
              <span className="font-[monospace] text-gray-600 w-24 text-start font-bold">
                {value}
              </span>
            </button>
          </li>
        ))}
    </ul>
  )
}

export const addToInputHelper =
  (
    inputRef: React.RefObject<HTMLInputElement>,
    setValue: (a: string) => void
  ) =>
  (varName: string) => {
    const selectionStart = inputRef.current?.selectionStart
    let selectionEnd = inputRef.current?.selectionEnd
    let newValue = ''
    if (
      typeof selectionStart === 'number' &&
      typeof selectionEnd === 'number'
    ) {
      newValue = stringSplice(
        inputRef.current?.value || '',
        selectionStart,
        selectionEnd,
        varName
      )
      selectionEnd = selectionStart + varName.length
    } else {
      newValue = inputRef.current?.value + varName
    }
    setValue(newValue)
    inputRef.current?.focus()
    setTimeout(() => {
      // run in the next render cycle
      const _selectionEnd =
        typeof selectionEnd === 'number' ? selectionEnd : newValue.length
      inputRef.current?.setSelectionRange(_selectionEnd, _selectionEnd)
    })
  }

function stringSplice(str: string, index: number, count: number, add: string) {
  return str.slice(0, index) + (add || '') + str.slice(index + count)
}

export const CalcResult = ({ calcResult }: { calcResult: string }) => {
  return (
    <div className="font-[monospace] pl-4 text-gray-600">
      <span
        className={`${
          calcResult === 'NAN' ? 'bg-pink-200' : ''
        } px-2 py-0.5 rounded`}
      >
        = {calcResult}
      </span>
    </div>
  )
}

export const CreateNewVariable = ({
  newVariableName,
  isNewVariableNameUnique,
  setNewVariableName,
  shouldCreateVariable,
  setShouldCreateVariable = () => {},
  showCheckbox = true,
}: {
  isNewVariableNameUnique: boolean
  newVariableName: string
  setNewVariableName: (a: string) => void
  shouldCreateVariable?: boolean
  setShouldCreateVariable?: (a: boolean) => void
  showCheckbox?: boolean
}) => {
  return (
    <>
      <label
        htmlFor="create-new-variable"
        className="block mt-3 font-mono text-chalkboard-90"
      >
        Create new variable
      </label>
      <div className="mt-1 flex gap-2 items-center">
        {showCheckbox && (
          <input
            type="checkbox"
            data-testid="create-new-variable-checkbox"
            checked={shouldCreateVariable}
            onChange={(e) => {
              setShouldCreateVariable(e.target.checked)
            }}
            className="bg-chalkboard-10 dark:bg-chalkboard-80"
          />
        )}
        <input
          type="text"
          disabled={!shouldCreateVariable}
          name="create-new-variable"
          id="create-new-variable"
          autoFocus={true}
          autoCapitalize="off"
          autoCorrect="off"
          className={`font-mono flex-1 sm:text-sm px-2 py-1 rounded-sm bg-chalkboard-10 dark:bg-chalkboard-90 text-chalkboard-90 dark:text-chalkboard-10 ${
            !shouldCreateVariable ? 'opacity-50' : ''
          }`}
          value={newVariableName}
          onChange={(e) => {
            setNewVariableName(e.target.value)
          }}
        />
      </div>
      {!isNewVariableNameUnique && (
        <div className="bg-pink-200 dark:bg-chalkboard-80 dark:text-pink-200 rounded px-2 py-0.5 text-xs">
          Sorry, that's not a unique variable name. Please try something else
        </div>
      )}
    </>
  )
}

export function removeDoubleNegatives(
  valueNode: BinaryPart,
  sign: number,
  variableName?: string
): BinaryPart {
  let finValue: BinaryPart = variableName
    ? createLocalName(variableName)
    : valueNode
  if (sign === -1) finValue = createUnaryExpression(finValue)
  if (
    finValue.type === 'UnaryExpression' &&
    finValue.operator === '-' &&
    finValue.argument.type === 'UnaryExpression' &&
    finValue.argument.operator === '-'
  ) {
    finValue = finValue.argument.argument
  }
  if (
    finValue.type === 'UnaryExpression' &&
    finValue.operator === '-' &&
    finValue.argument.type === 'Literal' &&
    typeof finValue.argument.value === 'number' &&
    finValue.argument.value < 0
  ) {
    finValue = createLiteral(-finValue.argument.value)
  }
  return finValue
}