"use client";

import { useEffect, useState } from "react";
import {
  attemptRomanceMilestone,
  confessRomance,
  fetchRomanceState,
  type ConfessionOutcome,
  type MilestoneResult,
  type MilestoneType,
  type RomanceStage,
  type RomanceState,
} from "../lib/api";

const ROMANCE_STAGE_LABELS: Record<RomanceStage, string> = {
  NONE: "朋友（戀愛軸未啟動）",
  INTERESTED: "在意",
  AMBIGUOUS: "曖昧",
  PARTNER: "戀人",
  DEEP_PARTNER: "深度伴侶",
  CRISIS: "關係危機",
};

const CONFESSION_OUTCOME_LABELS: Record<ConfessionOutcome, string> = {
  INELIGIBLE: "目前角色不具戀愛軸資格，無法告白。",
  REJECTED_TOO_SOON: "現在提還太尷尬了，她需要一點時間緩一緩。",
  REJECTED: "她婉拒了……心動值受到影響。",
  ACCEPTED: "她答應了！你們正式成為戀人。",
};

const MILESTONE_LABELS: Record<MilestoneType, string> = {
  DISTANCE_SHORTENED: "拉近距離",
  OCCASIONAL_CONTACT: "偶爾的肢體接觸",
  LATE_NIGHT_TALK: "深夜談心",
  HAND_HOLDING: "牽手",
  HUG: "擁抱",
  FOREHEAD_KISS: "額頭吻",
  CASUAL_INTIMACY: "日常親密互動",
};

interface RomanceSectionProps {
  characterId: string;
  userId: string;
  refreshKey: number; // 每完成一輪對話就遞增，讓戀愛狀態隨事件即時更新
}

// L-9：對話介面顯示心動值與戀愛階段，並提供告白／里程碑操作。
// 「不得把失敗畫成成功」：confess／milestone 的結果一律照 outcome/allowed 如實呈現，不做樂觀 UI。
export function RomanceSection({ characterId, userId, refreshKey }: RomanceSectionProps) {
  const [state, setState] = useState<RomanceState | null>(null);
  const [confessionMessage, setConfessionMessage] = useState<{ outcome: ConfessionOutcome } | null>(null);
  const [milestoneType, setMilestoneType] = useState<MilestoneType>("DISTANCE_SHORTENED");
  const [milestoneResult, setMilestoneResult] = useState<MilestoneResult | null>(null);
  const [pending, setPending] = useState(false);

  async function refresh() {
    try {
      setState(await fetchRomanceState(characterId, userId));
    } catch {
      // 戀愛狀態查詢失敗不影響對話本身，維持上一次已知狀態。
    }
  }

  useEffect(() => {
    void refresh();
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [characterId, userId, refreshKey]);

  async function handleConfess() {
    setPending(true);
    setConfessionMessage(null);
    try {
      const result = await confessRomance(characterId, userId);
      setConfessionMessage({ outcome: result.outcome });
      await refresh();
    } catch {
      setConfessionMessage(null);
    } finally {
      setPending(false);
    }
  }

  async function handleMilestone() {
    setPending(true);
    setMilestoneResult(null);
    try {
      const result = await attemptRomanceMilestone(characterId, userId, milestoneType);
      setMilestoneResult(result);
      await refresh();
    } catch {
      setMilestoneResult(null);
    } finally {
      setPending(false);
    }
  }

  if (!state) {
    return null;
  }

  return (
    <div className="flex flex-col gap-2 rounded-2xl border p-3 text-xs" style={{ borderColor: "var(--line)" }}>
      <div className="flex items-center justify-between">
        <span style={{ color: "var(--ink-soft)" }}>
          心動值 <b style={{ color: "var(--accent)" }}>{state.romanceMeter}</b>
        </span>
        <span className="rounded-full px-2 py-0.5 font-bold" style={{ background: "var(--chip-bg)", color: "var(--accent)" }}>
          {ROMANCE_STAGE_LABELS[state.romanceStage]}
        </span>
      </div>

      <div className="flex items-center gap-2">
        <button
          type="button"
          onClick={() => void handleConfess()}
          disabled={pending}
          className="rounded-full px-3 py-1 font-bold text-white disabled:opacity-50"
          style={{ background: "var(--accent-bright)" }}
        >
          告白
        </button>
        <select
          value={milestoneType}
          onChange={(event) => setMilestoneType(event.target.value as MilestoneType)}
          disabled={pending}
          className="rounded-full border bg-transparent px-2 py-1"
          style={{ borderColor: "var(--line)", color: "var(--ink)" }}
        >
          {Object.entries(MILESTONE_LABELS).map(([value, label]) => (
            <option key={value} value={value}>
              {label}
            </option>
          ))}
        </select>
        <button
          type="button"
          onClick={() => void handleMilestone()}
          disabled={pending}
          className="rounded-full border px-3 py-1 disabled:opacity-50"
          style={{ borderColor: "var(--line)", color: "var(--ink)" }}
        >
          嘗試
        </button>
      </div>

      {confessionMessage && (
        <p style={{ color: confessionMessage.outcome === "ACCEPTED" ? "var(--accent)" : "var(--ink-soft)" }}>
          {CONFESSION_OUTCOME_LABELS[confessionMessage.outcome]}
        </p>
      )}

      {milestoneResult && (
        <p style={{ color: milestoneResult.allowed ? "var(--accent)" : "var(--ink-soft)" }}>
          {milestoneResult.allowed
            ? `${milestoneResult.isFirstTime ? "（第一次）" : ""}她接受了這個舉動。`
            : milestoneResult.reactionLine ?? "現在還不是時候。"}
        </p>
      )}
    </div>
  );
}