import {
  CanvasChromeButton,
  Minimap,
  ZoomControls,
} from '@genarrative/image-canvas-react';
import {
  ImagePlus,
  Layers,
  Map as MapIcon,
  MessageCircle,
  Redo2,
  RotateCcw,
  Undo2,
  X,
} from 'lucide-react';
import type {
  CSSProperties,
  KeyboardEvent as ReactKeyboardEvent,
  PointerEvent as ReactPointerEvent,
} from 'react';
import { useEffect, useRef } from 'react';

import {
  PlatformFloatingMenu,
  PlatformFloatingMenuItem,
} from '../common/PlatformFloatingMenu';
import { PlatformInlineOptionButton } from '../common/PlatformInlineOptionButton';
import {
  CANVAS_BACKGROUND_OPTIONS,
  clamp,
  DEFAULT_CANVAS_BACKGROUND_COLOR,
  normalizeCanvasBackgroundHex,
} from './ImageCanvasEditorModel';
import { EditorIconButton } from './ImageCanvasEditorPrimitives';
import type { CanvasViewport, SidebarPanel } from './ImageCanvasEditorTypes';
import type { StageMinimapModel } from './ImageCanvasInteractionModel';

type ImageCanvasPanelDockViewProps = {
  viewport: CanvasViewport;
  canvasBackgroundColor: string;
  canvasBackgroundHexValue: string;
  canUndo: boolean;
  canRedo: boolean;
  isZoomMenuOpen: boolean;
  isBackgroundSettingsOpen: boolean;
  activeSidebarPanel: SidebarPanel | null;
  isAgentConversationEnabled: boolean;
  isAgentConversationOpen: boolean;
  isMinimapOpen: boolean;
  minimapModel: StageMinimapModel | null;
  onFitLayers: () => void;
  onUndoCanvasChange: () => void;
  onRedoCanvasChange: () => void;
  onUpdateScaleFromCenter: (nextScale: number) => void;
  onToggleZoomMenu: () => void;
  onCloseZoomMenu: () => void;
  onToggleBackgroundSettings: () => void;
  onApplyCanvasBackgroundColor: (color: string) => void;
  onCanvasBackgroundHexChange: (value: string) => void;
  onToggleSidebarPanel: (panel: SidebarPanel) => void;
  onToggleAgentConversation: () => void;
  onToggleMinimap: () => void;
  onMinimapPointerDown: (event: ReactPointerEvent<HTMLButtonElement>) => void;
};

type CanvasBackgroundHsv = {
  hue: number;
  saturation: number;
  value: number;
};

const DEFAULT_CANVAS_BACKGROUND_PICKER_HUE = 210;
const ACHROMATIC_BACKGROUND_SATURATION_EPSILON = 0.001;

function hexToRgb(value: string) {
  const normalizedValue = normalizeCanvasBackgroundHex(value);
  if (!normalizedValue) {
    return null;
  }
  return {
    red: Number.parseInt(normalizedValue.slice(1, 3), 16),
    green: Number.parseInt(normalizedValue.slice(3, 5), 16),
    blue: Number.parseInt(normalizedValue.slice(5, 7), 16),
  };
}

function rgbToHsv(red: number, green: number, blue: number) {
  const normalizedRed = red / 255;
  const normalizedGreen = green / 255;
  const normalizedBlue = blue / 255;
  const maxValue = Math.max(normalizedRed, normalizedGreen, normalizedBlue);
  const minValue = Math.min(normalizedRed, normalizedGreen, normalizedBlue);
  const delta = maxValue - minValue;
  const saturation = maxValue === 0 ? 0 : delta / maxValue;
  let hue = 0;
  if (delta > 0) {
    if (maxValue === normalizedRed) {
      hue = 60 * (((normalizedGreen - normalizedBlue) / delta) % 6);
    } else if (maxValue === normalizedGreen) {
      hue = 60 * ((normalizedBlue - normalizedRed) / delta + 2);
    } else {
      hue = 60 * ((normalizedRed - normalizedGreen) / delta + 4);
    }
  }
  return {
    hue: (hue + 360) % 360,
    saturation,
    value: maxValue,
  };
}

function hsvToHex({ hue, saturation, value }: CanvasBackgroundHsv) {
  const chroma = value * saturation;
  const normalizedHue = ((hue % 360) + 360) % 360;
  const secondComponent =
    chroma * (1 - Math.abs(((normalizedHue / 60) % 2) - 1));
  const matchValue = value - chroma;
  const [redPrime, greenPrime, bluePrime] =
    normalizedHue < 60
      ? [chroma, secondComponent, 0]
      : normalizedHue < 120
        ? [secondComponent, chroma, 0]
        : normalizedHue < 180
          ? [0, chroma, secondComponent]
          : normalizedHue < 240
            ? [0, secondComponent, chroma]
            : normalizedHue < 300
              ? [secondComponent, 0, chroma]
              : [chroma, 0, secondComponent];
  return `#${[redPrime, greenPrime, bluePrime]
    .map((channel) =>
      Math.round((channel + matchValue) * 255)
        .toString(16)
        .padStart(2, '0'),
    )
    .join('')}`;
}

function resolveCanvasBackgroundHsv(
  color: string,
  fallbackHue = DEFAULT_CANVAS_BACKGROUND_PICKER_HUE,
): CanvasBackgroundHsv {
  const rgb = hexToRgb(color) ?? hexToRgb(DEFAULT_CANVAS_BACKGROUND_COLOR);
  if (!rgb) {
    return { hue: fallbackHue, saturation: 0.02, value: 0.99 };
  }
  const hsv = rgbToHsv(rgb.red, rgb.green, rgb.blue);
  return {
    ...hsv,
    hue:
      hsv.saturation <= ACHROMATIC_BACKGROUND_SATURATION_EPSILON
        ? fallbackHue
        : hsv.hue,
  };
}

function getPointerRatio(
  event: ReactPointerEvent<HTMLElement>,
  axis: 'x' | 'y',
) {
  const rect = event.currentTarget.getBoundingClientRect();
  const size = axis === 'x' ? rect.width : rect.height;
  if (!Number.isFinite(size) || size <= 0) {
    return 0.5;
  }
  const clientPosition = axis === 'x' ? event.clientX : event.clientY;
  if (!Number.isFinite(clientPosition)) {
    return 0.5;
  }
  const offset =
    axis === 'x' ? clientPosition - rect.left : clientPosition - rect.top;
  return clamp(offset / size, 0, 1);
}

function resolveSpectrumPointerColor(
  event: ReactPointerEvent<HTMLElement>,
  currentColor: string,
  fallbackHue: number,
) {
  const currentHsv = resolveCanvasBackgroundHsv(currentColor, fallbackHue);
  return hsvToHex({
    hue: currentHsv.hue,
    saturation: getPointerRatio(event, 'x'),
    value: 1 - getPointerRatio(event, 'y'),
  });
}

function resolveHuePointerColor(
  event: ReactPointerEvent<HTMLElement>,
  currentColor: string,
  fallbackHue: number,
) {
  const currentHsv = resolveCanvasBackgroundHsv(currentColor, fallbackHue);
  return hsvToHex({
    hue: getPointerRatio(event, 'x') * 360,
    saturation: currentHsv.saturation,
    value: currentHsv.value,
  });
}

function isPrimaryPointerDrag(event: ReactPointerEvent<HTMLElement>) {
  return event.buttons === 1 || event.pointerType === 'touch';
}

export function ImageCanvasPanelDockView({
  viewport,
  canvasBackgroundColor,
  canvasBackgroundHexValue,
  canUndo,
  canRedo,
  isZoomMenuOpen,
  isBackgroundSettingsOpen,
  activeSidebarPanel,
  isAgentConversationEnabled,
  isAgentConversationOpen,
  isMinimapOpen,
  minimapModel,
  onFitLayers,
  onUndoCanvasChange,
  onRedoCanvasChange,
  onUpdateScaleFromCenter,
  onToggleZoomMenu,
  onCloseZoomMenu,
  onToggleBackgroundSettings,
  onApplyCanvasBackgroundColor,
  onCanvasBackgroundHexChange,
  onToggleSidebarPanel,
  onToggleAgentConversation,
  onToggleMinimap,
  onMinimapPointerDown,
}: ImageCanvasPanelDockViewProps) {
  const lastBackgroundHueRef = useRef(DEFAULT_CANVAS_BACKGROUND_PICKER_HUE);
  const backgroundHsv = resolveCanvasBackgroundHsv(
    canvasBackgroundColor,
    lastBackgroundHueRef.current,
  );
  useEffect(() => {
    if (backgroundHsv.saturation > ACHROMATIC_BACKGROUND_SATURATION_EPSILON) {
      lastBackgroundHueRef.current = backgroundHsv.hue;
    }
  }, [backgroundHsv.hue, backgroundHsv.saturation]);
  const backgroundHueColor = hsvToHex({
    hue: backgroundHsv.hue,
    saturation: 1,
    value: 1,
  });
  const backgroundSpectrumStyle = {
    '--image-canvas-background-hue-color': backgroundHueColor,
  } as CSSProperties;
  const backgroundSpectrumHandleStyle = {
    '--image-canvas-background-spectrum-handle-left': `clamp(0.42rem, ${backgroundHsv.saturation * 100}%, calc(100% - 0.42rem))`,
    '--image-canvas-background-spectrum-handle-top': `clamp(0.42rem, ${(1 - backgroundHsv.value) * 100}%, calc(100% - 0.42rem))`,
  } as CSSProperties;
  const backgroundHueHandleStyle = {
    '--image-canvas-background-hue-handle-left': `clamp(0.39rem, ${(backgroundHsv.hue / 360) * 100}%, calc(100% - 0.39rem))`,
  } as CSSProperties;
  const applySpectrumPointerColor = (event: ReactPointerEvent<HTMLElement>) => {
    event.preventDefault();
    event.currentTarget.setPointerCapture?.(event.pointerId);
    onApplyCanvasBackgroundColor(
      resolveSpectrumPointerColor(
        event,
        canvasBackgroundColor,
        backgroundHsv.hue,
      ),
    );
  };
  const applyHuePointerColor = (event: ReactPointerEvent<HTMLElement>) => {
    event.preventDefault();
    event.currentTarget.setPointerCapture?.(event.pointerId);
    onApplyCanvasBackgroundColor(
      resolveHuePointerColor(event, canvasBackgroundColor, backgroundHsv.hue),
    );
  };
  const handleSpectrumKeyDown = (
    event: ReactKeyboardEvent<HTMLButtonElement>,
  ) => {
    const step = event.shiftKey ? 0.1 : 0.03;
    const nextHsv = { ...backgroundHsv };
    if (event.key === 'ArrowLeft') {
      nextHsv.saturation = clamp(nextHsv.saturation - step, 0, 1);
    } else if (event.key === 'ArrowRight') {
      nextHsv.saturation = clamp(nextHsv.saturation + step, 0, 1);
    } else if (event.key === 'ArrowDown') {
      nextHsv.value = clamp(nextHsv.value - step, 0, 1);
    } else if (event.key === 'ArrowUp') {
      nextHsv.value = clamp(nextHsv.value + step, 0, 1);
    } else {
      return;
    }
    event.preventDefault();
    onApplyCanvasBackgroundColor(hsvToHex(nextHsv));
  };
  const handleHueKeyDown = (event: ReactKeyboardEvent<HTMLButtonElement>) => {
    const step = event.shiftKey ? 30 : 6;
    const nextHsv = { ...backgroundHsv };
    if (event.key === 'ArrowLeft') {
      nextHsv.hue = (nextHsv.hue - step + 360) % 360;
    } else if (event.key === 'ArrowRight') {
      nextHsv.hue = (nextHsv.hue + step) % 360;
    } else {
      return;
    }
    event.preventDefault();
    onApplyCanvasBackgroundColor(hsvToHex(nextHsv));
  };

  return (
    <>
      <EditorIconButton
        className="image-canvas-editor__reset-button"
        label="重置画布视图"
        title="重置画布视图"
        icon={RotateCcw}
        onClick={() => onFitLayers()}
      />

      <div
        className={[
          'image-canvas-editor__panel-dock',
          activeSidebarPanel
            ? 'image-canvas-editor__panel-dock--sidebar-open'
            : '',
        ]
          .filter(Boolean)
          .join(' ')}
        role="toolbar"
        aria-label="画布面板入口"
        onPointerDown={(event) => event.stopPropagation()}
      >
        <EditorIconButton
          label="撤销"
          title="撤销"
          icon={Undo2}
          disabled={!canUndo}
          onClick={onUndoCanvasChange}
        />
        <EditorIconButton
          label="恢复"
          title="恢复上一次撤销"
          icon={Redo2}
          disabled={!canRedo}
          onClick={onRedoCanvasChange}
        />
        <ZoomControls
          viewport={viewport}
          onFit={onFitLayers}
          onScaleFromCenter={onUpdateScaleFromCenter}
        >
          {(zoomActions) => (
            <div className="image-canvas-editor__zoom-menu-wrap">
              <PlatformInlineOptionButton
                className="image-canvas-editor__zoom-trigger"
                aria-label={`当前缩放比例 ${zoomActions.displayPercent}`}
                aria-haspopup="menu"
                aria-expanded={isZoomMenuOpen}
                onClick={onToggleZoomMenu}
              >
                {zoomActions.displayPercent}
              </PlatformInlineOptionButton>
              {isZoomMenuOpen ? (
                <PlatformFloatingMenu label="缩放菜单" placement="top-start">
                  {[
                    { label: '放大', action: zoomActions.zoomIn },
                    { label: '缩小', action: zoomActions.zoomOut },
                    {
                      label: '显示画布所有元素',
                      action: zoomActions.fit,
                    },
                  ].map(({ label, action }) => (
                    <PlatformFloatingMenuItem
                      key={label}
                      className="image-canvas-editor__zoom-menu-item"
                      onClick={() => {
                        action();
                        onCloseZoomMenu();
                      }}
                    >
                      {label}
                    </PlatformFloatingMenuItem>
                  ))}
                  {[0.5, 1, 2].map((displayScale) => (
                    <PlatformFloatingMenuItem
                      key={displayScale}
                      className="image-canvas-editor__zoom-menu-item"
                      onClick={() => {
                        zoomActions.zoomToDisplayScale(displayScale);
                        onCloseZoomMenu();
                      }}
                    >
                      缩放至{Math.round(displayScale * 100)}%
                    </PlatformFloatingMenuItem>
                  ))}
                </PlatformFloatingMenu>
              ) : null}
            </div>
          )}
        </ZoomControls>
        <div className="image-canvas-editor__background-control">
          <CanvasChromeButton
            label="画布背景色"
            title="画布背景色"
            expanded={isBackgroundSettingsOpen}
            onClick={onToggleBackgroundSettings}
            icon={
              <span
                className="image-canvas-editor__background-swatch-current"
                style={{ backgroundColor: canvasBackgroundColor }}
              />
            }
          />
          {isBackgroundSettingsOpen ? (
            <div
              className="image-canvas-editor__background-panel"
              role="dialog"
              aria-label="画布背景设置"
            >
              <div className="image-canvas-editor__background-panel-head">
                <span>画布背景</span>
                <button
                  type="button"
                  className="image-canvas-editor__background-close"
                  aria-label="关闭画布背景设置"
                  onClick={onToggleBackgroundSettings}
                >
                  <X className="h-4 w-4" aria-hidden="true" />
                </button>
              </div>
              <div className="image-canvas-editor__background-current-row">
                <span
                  className="image-canvas-editor__background-current-preview"
                  style={{ backgroundColor: canvasBackgroundColor }}
                  aria-hidden="true"
                />
                <span>{canvasBackgroundColor}</span>
              </div>
              <button
                type="button"
                className="image-canvas-editor__background-spectrum"
                aria-label="画布背景色盘"
                aria-valuetext={canvasBackgroundColor}
                style={backgroundSpectrumStyle}
                onPointerDown={applySpectrumPointerColor}
                onPointerMove={(event) => {
                  if (isPrimaryPointerDrag(event)) {
                    applySpectrumPointerColor(event);
                  }
                }}
                onKeyDown={handleSpectrumKeyDown}
              >
                <span
                  className="image-canvas-editor__background-spectrum-surface"
                  aria-hidden="true"
                />
                <span
                  className="image-canvas-editor__background-spectrum-handle"
                  aria-hidden="true"
                  style={backgroundSpectrumHandleStyle}
                />
              </button>
              <button
                type="button"
                className="image-canvas-editor__background-hue"
                aria-label="画布背景色相"
                aria-valuetext={canvasBackgroundColor}
                onPointerDown={applyHuePointerColor}
                onPointerMove={(event) => {
                  if (isPrimaryPointerDrag(event)) {
                    applyHuePointerColor(event);
                  }
                }}
                onKeyDown={handleHueKeyDown}
              >
                <span
                  className="image-canvas-editor__background-hue-handle"
                  aria-hidden="true"
                  style={backgroundHueHandleStyle}
                />
              </button>
              <div
                className="image-canvas-editor__background-presets"
                aria-label="画布背景预设色"
              >
                {CANVAS_BACKGROUND_OPTIONS.map((option) => (
                  <button
                    key={option.value}
                    type="button"
                    className="image-canvas-editor__background-preset"
                    aria-label={option.label}
                    aria-pressed={canvasBackgroundColor === option.value}
                    onClick={() => onApplyCanvasBackgroundColor(option.value)}
                  >
                    <span
                      className="image-canvas-editor__background-swatch"
                      style={{ backgroundColor: option.value }}
                    />
                  </button>
                ))}
              </div>
              <div className="image-canvas-editor__background-footer">
                <label className="image-canvas-editor__background-hex-field">
                  <span>HEX</span>
                  <input
                    aria-label="画布背景十六进制颜色"
                    value={canvasBackgroundHexValue}
                    spellCheck={false}
                    onChange={(event) =>
                      onCanvasBackgroundHexChange(event.currentTarget.value)
                    }
                  />
                </label>
                <button
                  type="button"
                  className="image-canvas-editor__background-reset"
                  onClick={() =>
                    onApplyCanvasBackgroundColor(
                      DEFAULT_CANVAS_BACKGROUND_COLOR,
                    )
                  }
                >
                  <RotateCcw className="h-3.5 w-3.5" aria-hidden="true" />
                  恢复默认
                </button>
              </div>
            </div>
          ) : null}
        </div>
        <EditorIconButton
          label="打开素材"
          title="素材"
          icon={ImagePlus}
          pressed={activeSidebarPanel === 'assets'}
          onClick={() => onToggleSidebarPanel('assets')}
        />
        <EditorIconButton
          label="打开图层"
          title="图层"
          icon={Layers}
          pressed={activeSidebarPanel === 'layers'}
          onClick={() => onToggleSidebarPanel('layers')}
        />
        {isAgentConversationEnabled ? (
          <EditorIconButton
            label="画布 Agent"
            title="画布 Agent"
            icon={MessageCircle}
            pressed={isAgentConversationOpen}
            onClick={onToggleAgentConversation}
          />
        ) : null}
        <EditorIconButton
          label="切换小地图"
          title="小地图"
          icon={MapIcon}
          pressed={isMinimapOpen}
          onClick={onToggleMinimap}
        />
      </div>

      {isMinimapOpen && minimapModel ? (
        <Minimap
          model={minimapModel}
          className="image-canvas-editor__minimap"
          stageClassName="image-canvas-editor__minimap-stage"
          layerClassName="image-canvas-editor__minimap-layer"
          viewportClassName="image-canvas-editor__minimap-viewport"
          onPointerDown={onMinimapPointerDown}
        />
      ) : null}
    </>
  );
}