import {
  Leaderboard,
  LeaderboardApi,
  LeaderboardCode,
  LeaderboardFrequency,
  LeaderboardRow,
} from "@/api_fsb";
import { useAppSelector } from "@/hooks";
import { bpid, formatCentsToUSD, truncate } from "@/lib/utils";
import { activeSurveys, activeUsers, maxPayout } from "@/models/grlStatsSlice";
import { clsx } from "clsx";
import moment from "moment";
import { FormEvent, useEffect, useState } from "react";

const showSmartRank = (
  item: LeaderboardRow,
  index: number,
  items: LeaderboardRow[] | undefined,
): boolean => {
  /**
   * Smart rank calculation - this determines if we should show the rank
   *  value. It's confusing to show people that multiple individuals ranked
   *  in the same place, so this will only display the next ranked value, eg:
   *
   *  - 1st
   *  - ___
   *  - 3rd
   *  - ___
   *  - ___
   *  - 6th
   *
   * @returns number
   */
  if (!items) return false;

  const thisRank = item.rank;
  if (index >= 1) {
    const prevRank = items[index - 1].rank;
    if (thisRank === prevRank) {
      return false;
    }
  }
  return true;
};

interface FrequencyButtonsProps {
  selected: LeaderboardFrequency;
  onChange: (frequency: LeaderboardFrequency) => void;
}

const frequency_map = [
  { label: "Day", value: LeaderboardFrequency.Daily },
  { label: "Week", value: LeaderboardFrequency.Weekly },
  { label: "Month", value: LeaderboardFrequency.Monthly },
];

const ThreeButtonToggle = ({ selected, onChange }: FrequencyButtonsProps) => {
  return (
    <div className="inline-flex rounded shadow-sm" role="group">
      {frequency_map.map((button, idx) => (
        <button
          type="button"
          key={button.value}
          onClick={() => onChange(button.value)}
          className={clsx(
            "px-2 py-1 text-[10px] font-medium",
            "border-t border-b border-gray-200",
            "hover:cursor-pointer hover:bg-zinc-200 hover:text-zinc-950",
            idx === 0 && "rounded-l",
            idx === frequency_map.length - 1 && "rounded-r",
            selected === button.value
              ? "text-zinc-50 bg-zinc-400"
              : "text-zinc-950 bg-zinc-50",
          )}
        >
          {button.label}
        </button>
      ))}
    </div>
  );
};

// Leaderboards Component
export const Leaderboards = () => {
  /**
   * Leaderboards do not do any caching, or better state management. This is okay because
   * the API is handled to take it. However, it can easily handled better client
   * side rather than making the
   * **/

  const [frequency, setFrequency] = useState<LeaderboardFrequency>(
    LeaderboardFrequency.Daily,
  );

  const [payouts, setPayouts] = useState<Leaderboard | null>(null);
  const [completes, setCompletes] = useState<Leaderboard | null>(null);

  const bpuid = undefined;

  useEffect(() => {
    new LeaderboardApi()
      .timespanLeaderboardProductIdLeaderboardTimespanBoardCodeGet(
        bpid,
        LeaderboardCode.CompleteCount,
        frequency,
        "us",
        bpuid,
        undefined, // within_time
        10,
      )
      .then((res) => {
        setCompletes(res.data.leaderboard as Leaderboard);
      });

    new LeaderboardApi()
      .timespanLeaderboardProductIdLeaderboardTimespanBoardCodeGet(
        bpid,
        LeaderboardCode.SumUserPayout,
        frequency,
        "us",
        bpuid,
        undefined,
        10,
      )
      .then((res) => {
        setPayouts(res.data.leaderboard as Leaderboard);
      });
  }, [frequency]);

  let dateRange = " - ";
  if (completes) {
    const start = moment(completes?.start_timestamp * 1000).format(
      "MMM Do, ha",
    );
    const end = moment(completes?.end_timestamp * 1000).format(
      "MMM Do, h:mm:ssa",
    );
    //dateRange = `${start} – ${end} (${completes?.timezone_name})`;
    dateRange = `${start} – ${end}`;
  }

  const freq_label = frequency_map
    .find((f) => f.value === frequency)
    ?.label.toLocaleLowerCase();

  return (
    <div className="my-2 mx-4 py-0">
      <div className="w-full flex items-center justify-between my-1">
        {/* Left spacer (hidden on small screens) */}
        <div className="hidden md:block md:w-1/3"></div>

        {/* Centered text */}
        <h3 className="text-center flex-1 md:1/3">Leaderboards</h3>

        {/* Right-aligned button group */}
        <div className="flex md:w-1/3 justify-end">
          <ThreeButtonToggle selected={frequency} onChange={setFrequency} />
        </div>
      </div>

      <div className="grid grid-cols-1 mb-2 text-zinc-700">
        <p className="text-center text-[10px] font-thin">{dateRange}</p>
      </div>

      <div
        className="grid grid-cols-1 gap-4 px-12 md:px-0
            md:grid-cols-2"
      >
        <table className="border-collapse text-emerald-950 text-[8px] md:text-sm">
          <caption className="caption-top text-xs font-semibold">
            Most earned in the past {freq_label}.
          </caption>
          <thead>
            <tr
              className="
                            font-mono font-semibold text-center
                            border border-zinc-150"
            >
              <th>Rank</th>
              <th>Bonus</th>
              <th>User</th>
            </tr>
          </thead>
          <tbody className="font-mono">
            {payouts?.rows?.map((dataItem: LeaderboardRow) => (
              <tr
                key={dataItem.bpuid}
                className="
                            text-center 
                            border border-zinc-100"
              >
                <td className="font-medium">{dataItem.rank}</td>
                <td className="font-semibold">
                  {formatCentsToUSD(dataItem.value)}
                </td>
                <td className="font-light">
                  {truncate(dataItem.bpuid, 6, "*****").toUpperCase()}
                </td>
              </tr>
            ))}
          </tbody>
        </table>

        <table
          className="border-collapse border border-gray-400
                text-emerald-950 text-[8px] md:text-sm"
        >
          <caption className="caption-top text-xs font-semibold">
            Top completes in the past {freq_label}.
          </caption>
          <thead>
            <tr
              className="
                            font-mono font-semibold text-center
                            border border-zinc-150 rounded"
            >
              <th>Rank</th>
              <th>Completes</th>
              <th>User</th>
            </tr>
          </thead>
          <tbody className="font-mono">
            {completes?.rows?.map((dataItem: LeaderboardRow, index: number) => (
              <tr
                key={dataItem.bpuid}
                className="
                            text-center
                            border border-zinc-100"
              >
                <td className="font-medium">
                  {dataItem.rank ??
                    showSmartRank(dataItem, index, completes?.rows)}
                </td>
                <td className="font-semibold">{dataItem.value}</td>
                <td className="font-light">
                  {truncate(dataItem.bpuid, 6, "*****").toUpperCase()}
                </td>
              </tr>
            ))}
          </tbody>
        </table>
      </div>
    </div>
  );
};

type RequestState = "idle" | "working" | "failed";

interface LoginFormProps {
  onSubmitSuccess: () => void;
}

const LoginForm = function ({ onSubmitSuccess }: LoginFormProps) {
  const [email, setEmail] = useState("");
  const [state, setState] = useState<RequestState>("idle");

  // const dispatch = useAppDispatch();
  const submit = async (event: FormEvent<HTMLFormElement>) => {
    event.preventDefault();
    setState("working");

    try {
      const response = await fetch("/auth/magic-link/request", {
        method: "POST",
        credentials: "include",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({
          email: email,
        }),
      });

      if (!response.ok) throw new Error("Account-link request failed");
      const body = (await response.json()) as { magic_link?: string };
      console.log(body.magic_link ?? null);
      onSubmitSuccess();
    } catch {
      setState("failed");
    }
  };

  return (
    <>
      <form className="w-full" onSubmit={submit}>
        <div className="flex items-center border-b-4  border-blue-700 py-2">
          <input
            className="appearance-none bg-transparent border-none w-full text-gray-700 mr-3 py-1 px-2 leading-tight focus:outline-none font-semibold"
            type="email"
            autoComplete="email"
            required
            value={email}
            onChange={(event) => setEmail(event.target.value)}
            placeholder="hello@jamesbillings67.com"
            aria-label="Email address"
          />

          <button
            className="flex-shrink-0 bg-blue-700 hover:bg-blue-800 text-white py-1 px-2 rounded cursor-pointer font-semibold"
            type="submit"
            disabled={state === "working"}
          >
            {state === "working" ? "Sending…" : "Login / Signup"}
          </button>
        </div>
      </form>

      {state === "failed" && <p>Unable to send the link. Please try again.</p>}
    </>
  );
};

const LoginSent = function () {
  return (
    <div className="my-1">
      <h2
        className="
                    bg-emerald-400 rounded py-2
                    text-white text-l font-semibold text-center"
      >
        Please check your email.
      </h2>
      <p className="text-slate-800 text-xs font-semibold text-center my-1 py-2">
        If you don't recieve anything, please check your spam folder, or try
        again shortly.
      </p>
    </div>
  );
};

const Login = () => {
  const [submitted, setSubmitted] = useState(false);

  return (
    <>
      {submitted ? (
        <LoginSent />
      ) : (
        <LoginForm onSubmitSuccess={() => setSubmitted(true)} />
      )}
    </>
  );
};

// Preview Component
const Preview = () => {
  /**
   *
   * @returns {JSX.Element}
   */

  const users = useAppSelector((state) => activeUsers(state));
  const users_f: string = users?.toLocaleString() ?? " – ";

  const surveys = useAppSelector((state) => activeSurveys(state));
  const surveys_f: string = surveys?.toLocaleString() ?? " – ";

  const survey_max_cpi = useAppSelector((state) => maxPayout(state));
  const formatter = new Intl.NumberFormat("en-US", {
    style: "currency",
    currency: "USD",
  });
  const survey_max_cpi_f: string = formatter.format(
    (survey_max_cpi ?? 0) / 100,
  );

  return (
    <>
      <Login />

      <div className="max-h-[calc(100vh-10rem)] overflow-y-auto">
        <div className="bg-zinc-100 rounded py-2 m-0">
          <p className="text-center text-sm italic text-zinc-600">
            {users_f} people are actively attempting {surveys_f} available
            surveys right now.
          </p>
        </div>

        <Leaderboards />

        <div className="bg-zinc-100 rounded py-2 px-6 m-0 text-xs text-center">
          <p className="py-1">
            Get paid to take surveys. Our algorithm attempts to pair you with
            the highest paying survey available at the moment (right now, the
            highest paying survey is {survey_max_cpi_f}) that you are eligible
            for. Try as many as you can, our system will self regulate you: we
            want to ensure you have a high chance of being paired with a survey
            based on what surveys are available, as their availability
            constantly changes.
          </p>
        </div>
      </div>
    </>
  );
};
export default Preview;