"use client";

import { useEffect, useState } from "react";
import { useRouter } from "next/navigation";

interface SubmissionItem {
  id: string;
  createdAt: string;
  projectSlug: string;
  projectTitle: string | null;
  payload: Record<string, unknown>;
}

type PageStatus = "idle" | "loading" | "error";

export default function AllProjectSubmissionsPage() {
  const router = useRouter();
  const [submissions, setSubmissions] = useState<SubmissionItem[]>([]);
  const [status, setStatus] = useState<PageStatus>("idle");
  const [errorMessage, setErrorMessage] = useState<string | null>(null);

  useEffect(() => {
    let cancelled = false;

    const load = async () => {
      try {
        setStatus("loading");
        setErrorMessage(null);

        const res = await fetch("/api/projects/submissions");

        if (!res.ok) {
          if (cancelled) return;

          if (res.status === 401) {
            setStatus("error");
            setErrorMessage("폼 제출 내역을 조회하려면 로그인이 필요합니다. 다시 로그인해 주세요.");
            router.push("/login");
            return;
          }

          setStatus("error");
          setErrorMessage("폼 제출 내역을 불러오는 중 오류가 발생했습니다. 잠시 후 다시 시도해 주세요.");
          return;
        }

        const data = (await res.json()) as SubmissionItem[];

        if (!cancelled) {
          setSubmissions(Array.isArray(data) ? data : []);
          setStatus("idle");
          setErrorMessage(null);
        }
      } catch {
        if (!cancelled) {
          setStatus("error");
          setErrorMessage("폼 제출 내역을 불러오는 중 오류가 발생했습니다. 잠시 후 다시 시도해 주세요.");
        }
      }
    };

    void load();

    return () => {
      cancelled = true;
    };
  }, []);

  const renderOtherFields = (payload: Record<string, unknown>): string => {
    const knownKeys = new Set(["name", "email", "phone", "birthdate"]);
    const entries = Object.entries(payload).filter(([key]) => !knownKeys.has(key));

    if (entries.length === 0) {
      return "-";
    }

    return entries
      .map(([key, value]) => {
        const stringValue = typeof value === "string" ? value : JSON.stringify(value);
        return `${key}: ${stringValue}`;
      })
      .join("\n");
  };

  return (
    <main className="min-h-screen flex flex-col bg-slate-950 text-slate-50">
      <header className="border-b border-slate-800 px-6 py-4 flex items-center justify-between bg-slate-950/80 backdrop-blur">
        <div>
          <h1 className="text-xl font-semibold">전체 폼 제출 내역</h1>
          <p className="text-xs text-slate-400">로그인한 계정의 모든 프로젝트에 대한 폼 제출 데이터를 확인할 수 있습니다.</p>
        </div>
        <div className="text-xs text-slate-300 flex flex-col items-end gap-1">
          <a
            href="/projects"
            role="link"
            className="text-[11px] text-sky-400 hover:text-sky-300 underline-offset-2 hover:underline"
            onClick={(event) => {
              event.preventDefault();
              router.push("/projects");
            }}
          >
            프로젝트 목록
          </a>
        </div>
      </header>

      <section className="flex-1 px-6 py-4 overflow-auto">
        {status === "error" && errorMessage && (
          <p className="text-xs text-red-300 mb-3">{errorMessage}</p>
        )}

        {status === "loading" && (
          <p className="text-xs text-slate-400 mb-3">폼 제출 내역을 불러오는 중입니다...</p>
        )}

        {submissions.length === 0 && status === "idle" && !errorMessage && (
          <p className="text-xs text-slate-400">아직 수집된 폼 제출 내역이 없습니다.</p>
        )}

        {submissions.length > 0 && (
          <table className="w-full text-xs text-left border-collapse mt-2">
            <thead>
              <tr className="border-b border-slate-800 text-slate-400">
                <th className="py-2 pr-4">제출 시각</th>
                <th className="py-2 pr-4">프로젝트</th>
                <th className="py-2 pr-4">Slug</th>
                <th className="py-2 pr-4">이름</th>
                <th className="py-2 pr-4">이메일</th>
                <th className="py-2 pr-4">전화번호</th>
                <th className="py-2 pr-4">생년월일</th>
                <th className="py-2 pr-4">기타 필드</th>
              </tr>
            </thead>
            <tbody>
              {submissions.map((item) => {
                const payload = (item.payload ?? {}) as Record<string, unknown>;

                const nameValue = payload["name"];
                const emailValue = payload["email"];
                const phoneValue = payload["phone"];
                const birthdateValue = payload["birthdate"];

                const name = typeof nameValue === "string" ? nameValue : "";
                const email = typeof emailValue === "string" ? emailValue : "";
                const phone = typeof phoneValue === "string" ? phoneValue : "";
                const birthdate = typeof birthdateValue === "string" ? birthdateValue : "";

                return (
                  <tr key={item.id} className="border-b border-slate-900 hover:bg-slate-900/60">
                    <td className="py-2 pr-4 text-slate-300 text-[11px]">
                      {new Date(item.createdAt).toLocaleString()}
                    </td>
                    <td className="py-2 pr-4 text-slate-100">{item.projectTitle ?? "-"}</td>
                    <td className="py-2 pr-4 text-slate-300">{item.projectSlug}</td>
                    <td className="py-2 pr-4 text-slate-100">{name}</td>
                    <td className="py-2 pr-4 text-slate-300">{email}</td>
                    <td className="py-2 pr-4 text-slate-300">{phone}</td>
                    <td className="py-2 pr-4 text-slate-300">{birthdate}</td>
                    <td className="py-2 pr-4 text-slate-300 whitespace-pre-wrap">
                      {renderOtherFields(payload)}
                    </td>
                  </tr>
                );
              })}
            </tbody>
          </table>
        )}
      </section>
    </main>
  );
}