import { useCallback, useEffect, useState } from "react";
import { ThumbsDown, ThumbsUp, User } from "lucide-react";
import { postVisitorSessionQuestionVote } from "../lib/api";
import { notifyRewardFromApiData } from "../lib/rewardCelebration";
import {
  getOrCreateAudienceVoteKey,
  readStoredQuestionVote,
  writeStoredQuestionVote,
} from "../lib/audienceVoteKey";

export type AudienceQuestionItem = {
  _id?: string;
  author: string;
  text: string;
  up: number;
  down: number;
};

export type AudienceQuestionVoteContext = {
  eventId: string;
  sessionId: string;
};

export function AudienceQuestionCard({
  item,
  variant = "default",
  voteContext,
}: {
  item: AudienceQuestionItem;
  variant?: "default" | "embedded";
  /** When set and `item._id` is present, up/down votes call the visitor API and sync to RTDB */
  voteContext?: AudienceQuestionVoteContext;
}) {
  const rawId = item._id;
  const qid =
    rawId == null || rawId === ""
      ? ""
      : typeof rawId === "string"
        ? rawId.trim()
        : String(rawId).trim();
  const canVote = Boolean(voteContext && qid);

  const [userVote, setUserVote] = useState<"up" | "down" | null>(() =>
    qid ? readStoredQuestionVote(qid) : null,
  );
  const [voting, setVoting] = useState(false);
  const [voteError, setVoteError] = useState<string | null>(null);

  useEffect(() => {
    setUserVote(qid ? readStoredQuestionVote(qid) : null);
  }, [qid]);

  const shell =
    variant === "embedded"
      ? "flex flex-col gap-4 p-4"
      : "flex flex-col gap-4 rounded-md border border-[#f2f2f7] bg-white p-4 shadow-[0_1px_4px_rgba(12,12,13,0.05)]";

  const doVote = useCallback(
    async (direction: "up" | "down") => {
      if (!canVote || !voteContext || voting) return;
      if (userVote === direction) return;
      setVoting(true);
      setVoteError(null);
      try {
        const voterKey = getOrCreateAudienceVoteKey();
        const res = await postVisitorSessionQuestionVote(
          voteContext.sessionId,
          voteContext.eventId,
          qid,
          { voterKey, direction },
        );
        setUserVote(res.yourVote);
        writeStoredQuestionVote(qid, res.yourVote);
        notifyRewardFromApiData(res);
      } catch (e) {
        setVoteError(e instanceof Error ? e.message : "Vote failed");
      } finally {
        setVoting(false);
      }
    },
    [canVote, voteContext, qid, userVote, voting],
  );

  const upBtn = (
    <button
      type="button"
      disabled={!canVote || voting}
      onClick={() => void doVote("up")}
      className={`flex items-center gap-2 rounded-full border-2 px-2 py-2 transition ${
        userVote === "up"
          ? "border-[#34c759] bg-[#34c759]/10 text-[#34c759]"
          : "border-[#34c759] bg-white text-[#34c759] hover:bg-[#34c759]/5"
      } disabled:cursor-not-allowed disabled:opacity-45`}
      aria-label={canVote ? "Upvote" : undefined}
    >
      <ThumbsUp className="size-4 shrink-0" strokeWidth={2} />
      <span className="text-[10px] font-medium tracking-wide">{item.up}</span>
    </button>
  );

  const downBtn = (
    <button
      type="button"
      disabled={!canVote || voting}
      onClick={() => void doVote("down")}
      className={`flex items-center gap-2 rounded-full border-2 px-2 py-2 transition ${
        userVote === "down"
          ? "border-[#ff3b30] bg-[#ff3b30]/10 text-[#ff3b30]"
          : "border-[#ff3b30] bg-white text-[#ff3b30] hover:bg-[#ff3b30]/5"
      } disabled:cursor-not-allowed disabled:opacity-45`}
      aria-label={canVote ? "Downvote" : undefined}
    >
      <span className="text-[10px] font-medium tracking-wide">{item.down}</span>
      <ThumbsDown className="size-4 shrink-0" strokeWidth={2} />
    </button>
  );

  return (
    <div className={shell}>
      <div className="flex items-center gap-2">
        <div className="flex size-8 items-center justify-center rounded-full bg-[#f2f2f7]">
          <User className="size-4 text-[#24282f]/70" strokeWidth={2} />
        </div>
        <span className="text-base font-semibold tracking-wide text-[#24282f]">{item.author}</span>
      </div>
      <p className="text-base leading-[22px] tracking-wide text-[#24282f]">{item.text}</p>
      <div className="flex flex-col items-end gap-1">
        <div className="flex justify-end gap-2">
          {canVote ? (
            upBtn
          ) : (
            <div className="flex items-center gap-2 rounded-full border-2 border-[#34c759] bg-white px-2 py-2 text-[#34c759]">
              <ThumbsUp className="size-4" strokeWidth={2} />
              <span className="text-[10px] font-medium tracking-wide">{item.up}</span>
            </div>
          )}
          {canVote ? (
            downBtn
          ) : (
            <div className="flex items-center gap-2 rounded-full border-2 border-[#ff3b30] bg-white px-2 py-2 text-[#ff3b30]">
              <span className="text-[10px] font-medium tracking-wide">{item.down}</span>
              <ThumbsDown className="size-4" strokeWidth={2} />
            </div>
          )}
        </div>
        {voteError ? <p className="max-w-full text-right text-xs text-red-600">{voteError}</p> : null}
      </div>
    </div>
  );
}