import React, { useState, useRef, useEffect, useCallback } from 'react';
import { createPortal } from 'react-dom';
import { useDraggablePanel } from '../hooks/useDraggablePanel';
import type { HLineStyle } from '../utils/indicatorRegistry';
import {
  parsePlotColor,
  formatPlotColor,
  plotColorCss,
  LINE_WIDTH_OPTIONS,
  LINE_STYLE_OPTIONS,
  LINE_STYLE_LABELS,
} from '../utils/plotColorUtils';
import ColorPickerPanel from './ColorPickerPanel';

export interface PlotLineStyleValue {
  color: string;
  lineWidth?: number;
  lineStyle?: HLineStyle;
}

interface PlotLineStylePickerProps {
  value: PlotLineStyleValue;
  disabled?: boolean;
  /** 팝업 제목 (예: MA3) */
  title?: string;
  /** false면 색상만 (히스토그램 등) */
  showLineControls?: boolean;
  onChange: (patch: Partial<PlotLineStyleValue>) => void;
}

interface PlotLineStylePopupProps {
  title?: string;
  showLineControls: boolean;
  hex6: string;
  alpha: number;
  lineWidth: number;
  lineStyle: HLineStyle;
  onChange: (patch: Partial<PlotLineStyleValue>) => void;
  onClose: () => void;
  patchColor: (hex: string, alphaPct: number) => void;
}

const PlotLineStylePopup: React.FC<PlotLineStylePopupProps> = ({
  title,
  showLineControls,
  hex6,
  alpha,
  lineWidth,
  lineStyle,
  onChange,
  onClose,
  patchColor,
}) => {
  const {
    panelRef,
    dragging,
    onHeaderPointerDown, headerTouchStyle,
    panelStyle,
    headerCursor,
  } = useDraggablePanel({ centerOnMount: true });

  return (
    <div className="plsp-portal-root">
      <div
        className="plsp-overlay"
        role="presentation"
        onMouseDown={onClose}
      />
      <div
        ref={panelRef}
        className="plsp-popup"
        role="dialog"
        aria-modal="true"
        aria-label={title ? `${title} 선 스타일` : '선 스타일'}
        style={{
          ...panelStyle,
          cursor: dragging ? 'grabbing' : undefined,
        }}
        onMouseDown={e => e.stopPropagation()}
      >
        <div
          className="gc-popup-header plsp-popup-header"
          onPointerDown={onHeaderPointerDown}
          style={{ cursor: headerCursor, ...headerTouchStyle }}
        >
          <span className="gc-popup-title plsp-popup-title">
            {title ? `${title} · ` : ''}색상 · 선 스타일
          </span>
          <button type="button" className="gc-popup-close plsp-popup-close" onClick={onClose} aria-label="닫기">
            ✕
          </button>
        </div>

        <ColorPickerPanel
          hex6={hex6}
          onHexChange={h => patchColor(h, alpha)}
        />

        <div className="plsp-section">
          <span className="plsp-section-label">불투명성</span>
          <div className="plsp-opacity-row">
            <input
              type="range"
              className="plsp-opacity-slider"
              min={0}
              max={100}
              value={alpha}
              onChange={e => patchColor(hex6, Number(e.target.value))}
            />
            <span className="plsp-opacity-pct">{alpha}%</span>
          </div>
        </div>

        {showLineControls && (
          <>
            <div className="plsp-section">
              <span className="plsp-section-label">두께</span>
              <div className="plsp-btn-group">
                {LINE_WIDTH_OPTIONS.map(w => (
                  <button
                    key={w}
                    type="button"
                    className={`plsp-icon-btn${lineWidth === w ? ' active' : ''}`}
                    title={`${w}px`}
                    onClick={() => onChange({ lineWidth: w })}
                  >
                    <svg width="24" height="14" viewBox="0 0 24 14" aria-hidden>
                      <line x1="2" y1="7" x2="22" y2="7" stroke="currentColor" strokeWidth={w} strokeLinecap="round" />
                    </svg>
                  </button>
                ))}
              </div>
            </div>

            <div className="plsp-section">
              <span className="plsp-section-label">라인 스타일</span>
              <div className="plsp-btn-group">
                {LINE_STYLE_OPTIONS.map(s => (
                  <button
                    key={s}
                    type="button"
                    className={`plsp-icon-btn${lineStyle === s ? ' active' : ''}`}
                    title={LINE_STYLE_LABELS[s]}
                    onClick={() => onChange({ lineStyle: s })}
                  >
                    <LineStyleIcon style={s} />
                  </button>
                ))}
              </div>
            </div>
          </>
        )}

        <div className="plsp-popup-footer">
          <button type="button" className="plsp-popup-ok" onClick={onClose}>
            확인
          </button>
        </div>
      </div>
    </div>
  );
};

const LineStyleIcon: React.FC<{ style: HLineStyle }> = ({ style }) => (
  <svg width="28" height="14" viewBox="0 0 28 14" aria-hidden>
    <line
      x1="2" y1="7" x2="26" y2="7"
      stroke="currentColor"
      strokeWidth="2"
      strokeLinecap="round"
      strokeDasharray={
        style === 'dashed' ? '6 4' : style === 'dotted' ? '2 3' : undefined
      }
    />
  </svg>
);

const PlotLineStylePicker: React.FC<PlotLineStylePickerProps> = ({
  value,
  disabled = false,
  title,
  showLineControls = true,
  onChange,
}) => {
  const [open, setOpen] = useState(false);
  const swatchRef = useRef<HTMLButtonElement>(null);
  const { hex6, alpha } = parsePlotColor(value.color);
  const lineWidth = value.lineWidth ?? 1;
  const lineStyle = value.lineStyle ?? 'solid';

  const close = useCallback(() => setOpen(false), []);

  useEffect(() => {
    if (!open) return;
    const onKey = (e: KeyboardEvent) => {
      if (e.key === 'Escape') close();
    };
    window.addEventListener('keydown', onKey);
    return () => window.removeEventListener('keydown', onKey);
  }, [open, close]);

  const patchColor = useCallback((hex: string, alphaPct: number) => {
    onChange({ color: formatPlotColor(hex, alphaPct) });
  }, [onChange]);

  const popup = open ? (
    <PlotLineStylePopup
      title={title}
      showLineControls={showLineControls}
      hex6={hex6}
      alpha={alpha}
      lineWidth={lineWidth}
      lineStyle={lineStyle}
      onChange={onChange}
      onClose={close}
      patchColor={patchColor}
    />
  ) : null;

  return (
    <div className={`plsp-inline${disabled ? ' plsp-inline--disabled' : ''}`}>
      <button
        ref={swatchRef}
        type="button"
        className="plsp-swatch"
        disabled={disabled}
        title="색상·선 스타일"
        onClick={() => !disabled && setOpen(true)}
      >
        <span
          className="plsp-swatch-inner"
          style={{ background: plotColorCss(value.color) }}
        />
      </button>
      {showLineControls && (
        <>
          <select
            className="plsp-inline-select"
            value={lineWidth}
            disabled={disabled}
            title="선 굵기"
            aria-label="선 굵기"
            onChange={e => onChange({ lineWidth: Number(e.target.value) })}
          >
            {LINE_WIDTH_OPTIONS.map(w => (
              <option key={w} value={w}>{w}</option>
            ))}
          </select>
          <select
            className="plsp-inline-select plsp-inline-select--style"
            value={lineStyle}
            disabled={disabled}
            title="선 유형"
            aria-label="선 유형"
            onChange={e => onChange({ lineStyle: e.target.value as HLineStyle })}
          >
            {LINE_STYLE_OPTIONS.map(s => (
              <option key={s} value={s}>{LINE_STYLE_LABELS[s]}</option>
            ))}
          </select>
        </>
      )}
      {typeof document !== 'undefined' && popup
        ? createPortal(popup, document.body)
        : null}
    </div>
  );
};

export default PlotLineStylePicker;