"use client";

import { useEffect, useState } from "react";
import {
  adjudicateLine,
  correctLineAttribution,
  getCanonScene,
  listCanonScenes,
  listCanonWorks,
  listCharacters,
  listContradictions,
  reattemptQuarantined,
  type CanonWork,
  type CharacterSummary,
  type SceneContradiction,
  type SceneLine,
} from "../../lib/api";

interface LineRow extends SceneLine {
  sceneId: string;
}

function characterLabel(characters: CharacterSummary[], characterId: string | null): string {
  if (!characterId) return "（無）";
  const found = characters.find((c) => c.id === characterId);
  return found?.aliases[0]?.formalName ?? characterId;
}

// M-11 待裁決畫面：列出隔離區台詞與待人工確認的矛盾，提供逐句裁決／歸屬更正／指紋精煉後重試。
export function CanonReviewView() {
  const [works, setWorks] = useState<CanonWork[]>([]);
  const [workId, setWorkId] = useState<string>("");
  const [characters, setCharacters] = useState<CharacterSummary[]>([]);
  const [quarantined, setQuarantined] = useState<LineRow[]>([]);
  const [confirmed, setConfirmed] = useState<LineRow[]>([]);
  const [contradictions, setContradictions] = useState<SceneContradiction[]>([]);
  const [selection, setSelection] = useState<Record<string, string>>({});
  const [pending, setPending] = useState(false);
  const [error, setError] = useState<string | null>(null);

  useEffect(() => {
    void listCanonWorks()
      .then(setWorks)
      .catch(() => setError("無法連線到 api 服務，作品清單暫時無法顯示"));
  }, []);

  async function refreshWork(targetWorkId: string) {
    if (!targetWorkId) return;
    setError(null);
    try {
      const [allCharacters, scenes, contradictionList] = await Promise.all([
        listCharacters(),
        listCanonScenes(targetWorkId),
        listContradictions(targetWorkId),
      ]);
      setCharacters(allCharacters.filter((c) => c.workId === targetWorkId));
      setContradictions(contradictionList);

      const details = await Promise.all(scenes.map((scene) => getCanonScene(scene.id)));
      const nextQuarantined: LineRow[] = [];
      const nextConfirmed: LineRow[] = [];
      for (const scene of details) {
        for (const line of scene.lines) {
          const row = { ...line, sceneId: scene.id };
          if (line.status === "QUARANTINED") {
            nextQuarantined.push(row);
          } else if (line.status === "CONFIRMED") {
            nextConfirmed.push(row);
          }
        }
      }
      setQuarantined(nextQuarantined);
      setConfirmed(nextConfirmed);
    } catch {
      setError("待裁決資料查詢失敗，請確認 api 服務是否已啟動");
    }
  }

  useEffect(() => {
    void refreshWork(workId);
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [workId]);

  async function handleAdjudicate(lineId: string) {
    const speakerCharacterId = selection[lineId];
    if (!speakerCharacterId || pending) return;
    setPending(true);
    setError(null);
    try {
      await adjudicateLine(lineId, speakerCharacterId);
      await refreshWork(workId);
    } catch {
      setError("裁決失敗，請確認 api 服務是否已啟動");
    } finally {
      setPending(false);
    }
  }

  async function handleCorrect(lineId: string) {
    const newSpeakerCharacterId = selection[lineId];
    if (!newSpeakerCharacterId || pending) return;
    setPending(true);
    setError(null);
    try {
      await correctLineAttribution(lineId, newSpeakerCharacterId);
      await refreshWork(workId);
    } catch {
      setError("歸屬更正失敗，請確認 api 服務是否已啟動");
    } finally {
      setPending(false);
    }
  }

  async function handleReattempt(sceneId: string) {
    if (pending) return;
    setPending(true);
    setError(null);
    try {
      const result = await reattemptQuarantined(sceneId);
      setError(null);
      await refreshWork(workId);
      // eslint-disable-next-line no-console
      console.info(`指紋精煉後重試釋放了 ${result.released} 句`);
    } catch {
      setError("重試失敗，請確認 api 服務是否已啟動");
    } finally {
      setPending(false);
    }
  }

  const sceneIdsWithQuarantine = Array.from(new Set(quarantined.map((line) => line.sceneId)));

  return (
    <div className="flex flex-col gap-4">
      <select
        value={workId}
        onChange={(event) => setWorkId(event.target.value)}
        className="rounded-full border bg-transparent px-3 py-2 text-sm"
        style={{ borderColor: "var(--line)", color: "var(--ink)" }}
      >
        <option value="">選擇作品……</option>
        {works.map((work) => (
          <option key={work.id} value={work.id}>
            {work.title}
          </option>
        ))}
      </select>

      {error && (
        <p className="text-xs" style={{ color: "var(--accent)" }}>
          {error}
        </p>
      )}

      {workId && (
        <>
          <section className="flex flex-col gap-2">
            <div className="flex items-center justify-between">
              <h2 className="text-sm font-bold" style={{ color: "var(--ink)" }}>
                隔離區台詞（QUARANTINED）
              </h2>
              {sceneIdsWithQuarantine.map((sceneId) => (
                <button
                  key={sceneId}
                  type="button"
                  onClick={() => void handleReattempt(sceneId)}
                  disabled={pending}
                  className="rounded-full border px-3 py-1 text-xs disabled:opacity-50"
                  style={{ borderColor: "var(--line)", color: "var(--ink-soft)" }}
                >
                  指紋精煉後重試此場景
                </button>
              ))}
            </div>
            {quarantined.length === 0 && (
              <p className="text-xs" style={{ color: "var(--ink-soft)" }}>
                目前沒有隔離中的台詞。
              </p>
            )}
            {quarantined.map((line) => (
              <div key={line.id} className="flex flex-col gap-1.5 rounded-2xl border p-3 text-xs" style={{ borderColor: "var(--line)" }}>
                <p style={{ color: "var(--ink)" }}>{line.rawText}</p>
                <p style={{ color: "var(--ink-soft)" }}>
                  信心分數：{(line.confidence * 100).toFixed(0)}%．證據來源：
                  {line.hasExplicitMarker ? `明示標記→${characterLabel(characters, line.markerCharacterId)}` : "推論（無明示標記）"}
                </p>
                <div className="flex items-center gap-2">
                  <select
                    value={selection[line.id] ?? ""}
                    onChange={(event) => setSelection({ ...selection, [line.id]: event.target.value })}
                    className="rounded-full border bg-transparent px-2 py-1"
                    style={{ borderColor: "var(--line)", color: "var(--ink)" }}
                  >
                    <option value="">選擇說話者……</option>
                    {characters.map((character) => (
                      <option key={character.id} value={character.id}>
                        {character.aliases[0]?.formalName ?? character.id}
                      </option>
                    ))}
                  </select>
                  <button
                    type="button"
                    onClick={() => void handleAdjudicate(line.id)}
                    disabled={pending || !selection[line.id]}
                    className="rounded-full px-3 py-1 font-bold text-white disabled:opacity-50"
                    style={{ background: "var(--accent-bright)" }}
                  >
                    裁決
                  </button>
                </div>
              </div>
            ))}
          </section>

          <section className="flex flex-col gap-2">
            <h2 className="text-sm font-bold" style={{ color: "var(--ink)" }}>
              已歸屬台詞（可更正）
            </h2>
            {confirmed.length === 0 && (
              <p className="text-xs" style={{ color: "var(--ink-soft)" }}>
                目前沒有已歸屬的台詞。
              </p>
            )}
            {confirmed.map((line) => (
              <div key={line.id} className="flex flex-col gap-1.5 rounded-2xl border p-3 text-xs" style={{ borderColor: "var(--line)" }}>
                <p style={{ color: "var(--ink)" }}>{line.rawText}</p>
                <p style={{ color: "var(--ink-soft)" }}>目前歸屬：{characterLabel(characters, line.speakerCharacterId)}</p>
                <div className="flex items-center gap-2">
                  <select
                    value={selection[line.id] ?? ""}
                    onChange={(event) => setSelection({ ...selection, [line.id]: event.target.value })}
                    className="rounded-full border bg-transparent px-2 py-1"
                    style={{ borderColor: "var(--line)", color: "var(--ink)" }}
                  >
                    <option value="">改為……</option>
                    {characters.map((character) => (
                      <option key={character.id} value={character.id}>
                        {character.aliases[0]?.formalName ?? character.id}
                      </option>
                    ))}
                  </select>
                  <button
                    type="button"
                    onClick={() => void handleCorrect(line.id)}
                    disabled={pending || !selection[line.id]}
                    className="rounded-full border px-3 py-1 disabled:opacity-50"
                    style={{ borderColor: "var(--line)", color: "var(--ink-soft)" }}
                  >
                    更正
                  </button>
                </div>
              </div>
            ))}
          </section>

          <section className="flex flex-col gap-2">
            <h2 className="text-sm font-bold" style={{ color: "var(--ink)" }}>
              待人工確認的矛盾（PENDING_HUMAN_REVIEW）
            </h2>
            {contradictions.filter((c) => c.status === "PENDING_HUMAN_REVIEW").length === 0 && (
              <p className="text-xs" style={{ color: "var(--ink-soft)" }}>
                目前沒有待確認的矛盾。
              </p>
            )}
            {contradictions
              .filter((c) => c.status === "PENDING_HUMAN_REVIEW")
              .map((contradiction) => (
                <div key={contradiction.id} className="rounded-2xl border p-3 text-xs" style={{ borderColor: "var(--line)" }}>
                  <p style={{ color: "var(--ink)" }}>
                    {contradiction.eventLabel}．{contradiction.factKey}
                  </p>
                  <p style={{ color: "var(--ink-soft)" }}>{contradiction.description}</p>
                </div>
              ))}
          </section>
        </>
      )}
    </div>
  );
}