"use client";

import { useCallback, useState, type Dispatch, type SetStateAction } from "react";

import { showChatNotice as setComposerNotice } from "@/lib/chat-notice";
import { saveCloudSynastryReport } from "@/lib/home-cloud-sync";
import { buildSynastryQuestion } from "@/lib/home-profile";
import {
  timestamp,
  type ChartLibraryRecord,
  type Profile,
  type SynastryRelationshipType,
  type SynastryReportCard,
  type Theme,
} from "@/lib/home-types";

export type SynastryParams = {
  accountId: string | undefined;
  profile: Profile;
  chooseSuggestedQuestion: (question: string, theme: Theme) => void;
  closeAccountDialog: () => void;
};

export type SynastryPanel = {
  synastryRelationshipType: SynastryRelationshipType;
  setSynastryRelationshipType: Dispatch<SetStateAction<SynastryRelationshipType>>;
  synastryPendingId: string | null;
  synastryReportCard: SynastryReportCard | null;
  setSynastryReportCard: Dispatch<SetStateAction<SynastryReportCard | null>>;
  synastryHistory: SynastryReportCard[];
  draftSynastryQuestionFromChart: (record: ChartLibraryRecord, relationshipType: SynastryRelationshipType) => Promise<void>;
};

/**
 * Owns the four synastry states that used to sit in Home(). Home keeps only the
 * two stable history hooks the chart-library effect calls; everything else the
 * chart-library dialog needs travels as one `synastryPanel` object.
 */
export function useSynastry(params: SynastryParams) {
  const { accountId, profile, chooseSuggestedQuestion, closeAccountDialog } = params;
  const [synastryRelationshipType, setSynastryRelationshipType] = useState<SynastryRelationshipType>("romance");
  const [synastryPendingId, setSynastryPendingId] = useState<string | null>(null);
  const [synastryReportCard, setSynastryReportCard] = useState<SynastryReportCard | null>(null);
  const [synastryHistory, setSynastryHistory] = useState<SynastryReportCard[]>([]);

  // Stable across renders so Home's chart-library effect can list them in its
  // dependency array without gaining a re-run.
  const clearSynastryHistory = useCallback(() => {
    setSynastryHistory([]);
  }, []);
  const applyCloudSynastryHistory = useCallback((cloudHistory: SynastryReportCard[]) => {
    setSynastryHistory([...cloudHistory].sort((a, b) => b.createdAt - a.createdAt).slice(0, 10));
  }, []);

  async function draftSynastryQuestionFromChart(record: ChartLibraryRecord, relationshipType: SynastryRelationshipType) {
    if (record.role !== "other") return;
    if (synastryPendingId) return;
    const baseQuestion = buildSynastryQuestion(profile, record.profile, relationshipType);
    setSynastryPendingId(record.id);
    setComposerNotice("正在计算基础合盘证据，请稍候。");
    try {
      const response = await fetch("/api/synastry", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ partnerChartProfileId: record.id, relationshipType }),
      });
      const payload = await response.json().catch(() => null) as { status?: string; claimStatus?: string; blockedLayers?: string[]; evidenceLayers?: string[]; synastry?: { total_score?: number; max_score?: number; assessment?: string }; relationshipReport?: { headline?: string; scoreBand?: string; strengths?: string[]; risks?: string[]; nextEvidence?: string[] } } | null;
      if (response.ok && payload?.status === "ok") {
        const score = payload.synastry?.total_score;
        const max = payload.synastry?.max_score;
        const assessment = payload.synastry?.assessment;
        const layers = (payload.evidenceLayers || []).join(" / ") || "Ashtakoot / Moon / D9";
        const evidenceSummary = relationshipType === "business"
          ? `已完成基础商业合作证据筛查：${layers}；声明状态：${payload.claimStatus || "partial"}；未用层：${(payload.blockedLayers || []).join(" / ") || "A10 / 双方 Dasha-Narayana / 功能吉凶"}。请勿将其表述为合作保证或精确时点。`
          : `已计算基础合盘证据：${layers}；Ashtakoot ${score ?? "?"}/${max ?? "?"}，初步评级：${assessment || "待解释"}。请基于这个证据包继续分析。`;
        const reportCard: SynastryReportCard = {
          id: `${record.id}-${timestamp()}`,
          partnerName: record.profile.name || "对方",
          partnerChartId: record.id,
          score,
          maxScore: max,
          assessment,
          headline: payload.relationshipReport?.headline,
          scoreBand: payload.relationshipReport?.scoreBand,
          strengths: payload.relationshipReport?.strengths,
          risks: payload.relationshipReport?.risks,
          nextEvidence: payload.relationshipReport?.nextEvidence,
          createdAt: timestamp(),
        };
        let savedReportCard = reportCard;
        let historyPersisted = !accountId;
        if (accountId) {
          try {
            savedReportCard = await saveCloudSynastryReport(reportCard);
            historyPersisted = true;
          } catch {
            historyPersisted = false;
          }
        }
        setSynastryReportCard(savedReportCard);
        if (accountId && historyPersisted) {
          setSynastryHistory((current) => (
            [savedReportCard, ...current.filter((item) => item.id !== savedReportCard.id)].slice(0, 10)
          ));
        }
        chooseSuggestedQuestion([
          baseQuestion,
          "",
          evidenceSummary,
          payload.relationshipReport?.headline ? `结构化摘要：${payload.relationshipReport.headline}` : "",
        ].join("\n"), relationshipType === "business" ? "career" : "marriage");
        if (accountId && !historyPersisted) {
          setComposerNotice("未能存入历史");
        }
      } else {
        chooseSuggestedQuestion(baseQuestion, relationshipType === "business" ? "career" : "marriage");
        setComposerNotice(response.status === 404
          ? "请先把对方星盘保存到云端，再用于合盘。"
          : response.status === 429
            ? "合盘请求过于频繁，请稍后再试。"
            : payload?.status === "blocked" ? "合盘计算暂时不可用，已先生成问题草稿。" : "已生成合盘问题草稿。");
      }
    } catch {
      chooseSuggestedQuestion(baseQuestion, relationshipType === "business" ? "career" : "marriage");
      setComposerNotice("合盘计算暂时不可用，已先生成问题草稿。");
    } finally {
      setSynastryPendingId(null);
    }
    closeAccountDialog();
  }

  const synastryPanel: SynastryPanel = {
    synastryRelationshipType,
    setSynastryRelationshipType,
    synastryPendingId,
    synastryReportCard,
    setSynastryReportCard,
    synastryHistory,
    draftSynastryQuestionFromChart,
  };

  return { synastryPanel, clearSynastryHistory, applyCloudSynastryHistory };
}