'use client';

import { useEffect, useRef } from 'react';
import { MousePointerClick } from 'lucide-react';
import { useControlMode } from './hooks/useControlMode';
import { FlowViewer } from './FlowViewer';
import { getMetaFields } from '@/lib/api/meta';
import type { FieldConfig } from '@/types/invyone-component';
import { ContextBar } from './ide/ContextBar';
import { LeftRail } from './ide/LeftRail';
import { RightRail } from './ide/RightRail';
import { Canvas } from './ide/Canvas';
import { StatusBar } from './ide/StatusBar';
import { CtrlFab } from './ide/CtrlFab';
import '@/styles/control-mode.css';

interface ControlModeProps {
  dashboardId: string;
  cards: Record<string, any>[];
  canvasRef: React.RefObject<HTMLDivElement | null>;
}

/**
 * 제어 모드 — Control IDE (v3 V3Takeover 베이스)
 *
 * 흐름:
 *   1) ⚡ 토글 ON → 대시보드 카드들이 흐려지고 FlowViewer 가 호버 토폴로지 표시 + ctrl-mode-hint + FAB
 *   2) 카드 클릭 → IDE 5-분할 takeover (ContextBar / LeftRail / Canvas / RightRail / StatusBar)
 *   3) ContextBar 의 4-segmented tabs 로 READ / EDIT / RUN / HISTORY 전환
 *   4) ContextBar 의 ✕ 닫기 → 카드 선택 해제 (제어 유지)
 *   5) ContextBar 의 제어 종료 → 제어 모드 OFF
 */
export function ControlMode({ dashboardId, cards, canvasRef }: ControlModeProps) {
  const active             = useControlMode((s) => s.active);
  const mode               = useControlMode((s) => s.mode);
  const selectedCardId     = useControlMode((s) => s.selectedCardId);
  const tablePositions     = useControlMode((s) => s.tablePositions);
  const flowEdges          = useControlMode((s) => s.flowEdges);
  const setSelectedCardId  = useControlMode((s) => s.setSelectedCardId);
  const toggleControlMode  = useControlMode((s) => s.toggleControlMode);
  const setRuleNodes       = useControlMode((s) => s.setRuleNodes);
  const setRuleConnections = useControlMode((s) => s.setRuleConnections);
  const editInitDone = useRef<string | null>(null);

  const selectedCard = selectedCardId
    ? cards.find((c) => (c.card_id ?? c.CARD_ID ?? c.id) === selectedCardId) ?? null
    : null;

  // edit 진입 시 자동 노드 등록:
  //  - view 에서 펼쳐진 테이블이 있으면 그것들 + 관계선
  //  - 없으면 primary_table 1개만 좌측에 카드로 등장 (사용자가 거기서 컬럼별 마우스 연결로 룰 작성)
  useEffect(() => {
    if (!active || mode !== 'edit' || !selectedCardId) return;
    const key = `${selectedCardId}:${mode}:${Object.keys(tablePositions).join(',')}`;
    if (editInitDone.current === key) return;
    const { ruleNodes } = useControlMode.getState();
    if (ruleNodes.length > 0) {
      editInitDone.current = key;
      return;
    }
    editInitDone.current = key;

    const hasView = Object.keys(tablePositions).length > 0;

    if (!hasView) return;  // primary_table 자동 등장 X — 사용자가 LeftRail 에서 드래그할 때만 추가

    // view 에서 펼쳐진 테이블 우선
    if (hasView) {
      const tableIdMap: Record<string, string> = {};
      Object.keys(tablePositions).forEach((name) => { tableIdMap[name] = `tbl-${name}`; });
      const xs = Object.values(tablePositions).map((p) => p.x);
      const ys = Object.values(tablePositions).map((p) => p.y);
      const minX = xs.length ? Math.min(...xs) : 0;
      const minY = ys.length ? Math.min(...ys) : 0;

      (async () => {
        const newNodes: Record<string, any>[] = await Promise.all(
          Object.entries(tablePositions).map(async ([name, pos]) => {
            let columns: FieldConfig[] = [];
            let label = name;
            try {
              const meta = await getMetaFields(name);
              columns = (meta.fields ?? []).filter((f: FieldConfig) => !f.system);  // 모든 컬럼 로드 (Phase 2 dropdown 용)
              label = meta.table_label ?? name;
            } catch { /* 빈 컬럼 */ }
            return {
              id: tableIdMap[name], type: 'table', table_name: name, label,
              x: pos.x - minX + 50, y: pos.y - minY + 50, columns,
            };
          }),
        );
        const newConns: Record<string, any>[] = [];
        flowEdges.forEach((edge: Record<string, any>, i: number) => {
          if (typeof edge.from === 'string' && edge.from.startsWith('CARD:')) return;
          const fromId = tableIdMap[edge.from];
          const toId   = tableIdMap[edge.to];
          if (!fromId || !toId) return;
          newConns.push({
            id: `conn-edit-${i}`,
            from_node_id: fromId, from_port: 'out',
            to_node_id: toId, to_port: 'in',
          });
        });
        setRuleNodes(newNodes);
        setRuleConnections(newConns);
      })();
    }
  }, [active, mode, selectedCardId, tablePositions, flowEdges, setRuleNodes, setRuleConnections]);

  // mode 가 view 로 돌아가거나 카드 변경 시 init guard 리셋
  useEffect(() => {
    if (mode === 'view' || !selectedCardId) {
      editInitDone.current = null;
    }
  }, [mode, selectedCardId]);

  // 캔버스에 mode 클래스 + 선택 카드 강조 클래스
  useEffect(() => {
    const cv = canvasRef.current;
    if (!cv) return;
    cv.classList.toggle('control-mode-edit', active && mode === 'edit');
    return () => {
      cv.classList.remove('control-mode-edit');
    };
  }, [active, mode, canvasRef]);

  // 선택된 카드 element 에 data-flow-active 토글
  useEffect(() => {
    const cv = canvasRef.current;
    if (!cv) return;
    cv.querySelectorAll<HTMLElement>('[data-card-id]').forEach((el) => {
      const id = el.dataset.cardId;
      if (active && id === selectedCardId) {
        el.setAttribute('data-flow-active', '1');
      } else {
        el.removeAttribute('data-flow-active');
      }
    });
    return () => {
      cv.querySelectorAll<HTMLElement>('[data-card-id]').forEach((el) => {
        el.removeAttribute('data-flow-active');
      });
    };
  }, [active, selectedCardId, canvasRef]);

  if (!active) return null;

  return (
    <>
      {/* 카드 미선택 — FlowViewer (호버 토폴로지) + 안내 칩 + FAB */}
      {!selectedCard && (
        <>
          <FlowViewer cards={cards} canvasRef={canvasRef} dashboardId={dashboardId} />
          <div className="ctrl-mode-hint">
            <MousePointerClick size={13} style={{ color: 'rgb(0, 154, 150)' }} />
            <span>카드를 클릭하면 <b>Control IDE</b> 가 펼쳐집니다</span>
          </div>
          <CtrlFab onExit={toggleControlMode} />
        </>
      )}

      {/* 카드 선택 — IDE 5-분할 takeover */}
      {selectedCard && (
        <div className="ctrl-ide-shell">
          <ContextBar
            selectedCard={selectedCard}
            onExit={() => setSelectedCardId(null)}
            onCtrlExit={toggleControlMode}
          />
          <LeftRail cards={cards} selectedCardId={selectedCardId!} />
          <div className="ctrl-ide-canvas">
            <Canvas card={selectedCard} canvasRef={canvasRef} dashboardId={dashboardId} />
          </div>
          <RightRail selectedCard={selectedCard} />
          <StatusBar selectedCard={selectedCard} />
        </div>
      )}
    </>
  );
}

/** 호환성 stub — 외부에서 이름으로만 import 하는 경우 */
export function ControlPaletteWrapper() {
  return null;
}