import { Fragment, h, VNode } from "preact";
import { useState } from "preact/hooks";
import { AnastasisClientFrame } from ".";
import { ChallengeFeedback, ChallengeInfo } from "../../../../anastasis-core/lib";
import { TextInput } from "../../components/fields/TextInput";
import { useAnastasisContext } from "../../context/anastasis";

export function SolveScreen(): VNode {
  const reducer = useAnastasisContext()
  const [answer, setAnswer] = useState("");

  if (!reducer) {
    return <AnastasisClientFrame hideNav title="Recovery problem">
      <div>no reducer in context</div>
    </AnastasisClientFrame>
  }
  if (!reducer.currentReducerState || reducer.currentReducerState.recovery_state === undefined) {
    return <AnastasisClientFrame hideNav title="Recovery problem">
      <div>invalid state</div>
    </AnastasisClientFrame>
  }

  if (!reducer.currentReducerState.recovery_information) {
    return <AnastasisClientFrame hideNext="Recovery document not found" title="Recovery problem">
      <div>no recovery information found</div>
    </AnastasisClientFrame>
  }
  if (!reducer.currentReducerState.selected_challenge_uuid) {
    return <AnastasisClientFrame hideNav title="Recovery problem">
      <div>invalid state</div>
    </AnastasisClientFrame>
  }

  const chArr = reducer.currentReducerState.recovery_information.challenges;
  const challengeFeedback = reducer.currentReducerState.challenge_feedback ?? {};
  const selectedUuid = reducer.currentReducerState.selected_challenge_uuid;
  const challenges: {
    [uuid: string]: ChallengeInfo;
  } = {};
  for (const ch of chArr) {
    challenges[ch.uuid] = ch;
  }
  const selectedChallenge = challenges[selectedUuid];
  const dialogMap: Record<string, (p: SolveEntryProps) => h.JSX.Element> = {
    question: SolveQuestionEntry,
    sms: SolveSmsEntry,
    email: SolveEmailEntry,
    post: SolvePostEntry,
  };
  const SolveDialog = selectedChallenge === undefined ? SolveUndefinedEntry : dialogMap[selectedChallenge.type] ?? SolveUnsupportedEntry;

  function onNext(): void {
    reducer?.transition("solve_challenge", { answer })
  }
  function onCancel(): void {
    reducer?.back()
  }


  return (
    <AnastasisClientFrame
      hideNav
      title="Recovery: Solve challenge"
    >
      <SolveDialog
        id={selectedUuid}
        answer={answer}
        setAnswer={setAnswer}
        challenge={selectedChallenge}
        feedback={challengeFeedback[selectedUuid]} />

      <div style={{ marginTop: '2em', display: 'flex', justifyContent: 'space-between' }}>
        <button class="button" onClick={onCancel}>Cancel</button>
        <button class="button is-info" onClick={onNext} >Confirm</button>
      </div>
    </AnastasisClientFrame>
  );
}

export interface SolveEntryProps {
  id: string;
  challenge: ChallengeInfo;
  feedback?: ChallengeFeedback;
  answer: string;
  setAnswer: (s: string) => void;
}

function SolveSmsEntry({ challenge, answer, setAnswer }: SolveEntryProps): VNode {
  return (<Fragment>
    <p>An sms has been sent to "<b>{challenge.instructions}</b>". Type the code below</p>
    <TextInput label="Answer" grabFocus bind={[answer, setAnswer]} />
  </Fragment>
  );
}
function SolveQuestionEntry({ challenge, answer, setAnswer }: SolveEntryProps): VNode {
  return (
    <Fragment>
      <p>Type the answer to the following question:</p>
      <pre>
        {challenge.instructions}
      </pre>
      <TextInput label="Answer" grabFocus bind={[answer, setAnswer]} />
    </Fragment>
  );
}

function SolvePostEntry({ challenge, answer, setAnswer }: SolveEntryProps): VNode {
  return (
    <Fragment>
      <p>instruction for post type challenge "<b>{challenge.instructions}</b>"</p>
      <TextInput label="Answer" grabFocus bind={[answer, setAnswer]} />
    </Fragment>
  );
}

function SolveEmailEntry({ challenge, answer, setAnswer }: SolveEntryProps): VNode {
  return (
    <Fragment>
      <p>An email has been sent to "<b>{challenge.instructions}</b>". Type the code below</p>
      <TextInput label="Answer" grabFocus bind={[answer, setAnswer]} />
    </Fragment>
  );
}

function SolveUnsupportedEntry(props: SolveEntryProps): VNode {
  return (
    <Fragment>
      <p>
        The challenge selected is not supported for this UI. Please update this version or try using another policy.
      </p>
      <p>
        <b>Challenge type:</b> {props.challenge.type}
      </p>
    </Fragment>
  );
}
function SolveUndefinedEntry(props: SolveEntryProps): VNode {
  return (
    <Fragment >
      <p>
        There is no challenge information for id <b>"{props.id}"</b>. Try resetting the recovery session.
      </p>
    </Fragment>
  );
}