import {
  TOOLBAR_HALF_WIDTH,
  clamp,
} from './ImageCanvasEditorModel';
import {
  ICON_COMPOSER_HORIZONTAL_CHROME_REM,
  ICON_COMPOSER_MIN_WIDTH_REM,
  ICON_DESCRIPTION_CARD_WIDTH_REM,
} from './ImageCanvasGenerationModel';
import type {
  CanvasGenerationDialogMode,
  CanvasGenerationDialogState,
  CanvasLayer,
  CanvasViewport,
  CharacterAnimationPanelState,
  GenerateDialogState,
  QuickEditPanelState,
} from './ImageCanvasEditorTypes';

type CanvasSize = {
  width: number;
  height: number;
};

type OverlayAnchor = Pick<CanvasLayer, 'x' | 'y' | 'width' | 'height'>;

export type CanvasOverlayStyle = {
  left: number;
  top: number;
};

export type CanvasComposerOverlayStyle = CanvasOverlayStyle & {
  width?: string;
};

export function resolveGenerationAnchor({
  dialog,
  generatedLayer,
}: {
  dialog: CanvasGenerationDialogState | null;
  generatedLayer: CanvasLayer | null;
}) {
  if (!dialog) {
    return null;
  }
  return generatedLayer ?? dialog.placeholder ?? null;
}

export function resolveGenerationComposerStyle({
  dialog,
  anchor,
  viewport,
}: {
  dialog: CanvasGenerationDialogState | null;
  anchor: OverlayAnchor | null;
  viewport: CanvasViewport;
}): CanvasOverlayStyle | null {
  if (
    !dialog ||
    dialog.status === 'generating' ||
    dialog.composerOpen === false ||
    !anchor
  ) {
    return null;
  }
  return {
    left: viewport.x + (anchor.x + anchor.width / 2) * viewport.scale,
    top: viewport.y + (anchor.y + anchor.height) * viewport.scale + 10,
  };
}

export function resolveIconComposerStyle({
  dialog,
  composerStyle,
  iconDescriptionCount,
}: {
  dialog: CanvasGenerationDialogState | null;
  composerStyle: CanvasOverlayStyle | null;
  iconDescriptionCount: number;
}): CanvasComposerOverlayStyle | null {
  if (dialog?.mode !== 'icon' || !composerStyle) {
    return null;
  }
  return {
    ...composerStyle,
    width: `${Math.max(
      ICON_COMPOSER_MIN_WIDTH_REM,
      ICON_COMPOSER_HORIZONTAL_CHROME_REM +
        iconDescriptionCount * ICON_DESCRIPTION_CARD_WIDTH_REM,
    ).toFixed(1)}rem`,
  };
}

export function resolveSelectedToolbarStyle({
  selectedLayer,
  viewport,
  canvasSize,
}: {
  selectedLayer: CanvasLayer | null;
  viewport: CanvasViewport;
  canvasSize: CanvasSize;
}): CanvasOverlayStyle | null {
  if (!selectedLayer) {
    return null;
  }
  return {
    left: clamp(
      viewport.x +
        selectedLayer.x * viewport.scale +
        (selectedLayer.width * viewport.scale) / 2,
      TOOLBAR_HALF_WIDTH,
      Math.max(TOOLBAR_HALF_WIDTH, canvasSize.width - TOOLBAR_HALF_WIDTH),
    ),
    top: Math.max(10, viewport.y + selectedLayer.y * viewport.scale - 12),
  };
}

export function resolveQuickEditPanelStyle({
  panel,
  sourceLayer,
  viewport,
  canvasSize,
}: {
  panel: QuickEditPanelState | null;
  sourceLayer: CanvasLayer | null;
  viewport: CanvasViewport;
  canvasSize: CanvasSize;
}): CanvasOverlayStyle | null {
  if (!panel || !sourceLayer) {
    return null;
  }
  return {
    left: clamp(
      viewport.x +
        (sourceLayer.x + sourceLayer.width / 2) * viewport.scale,
      12,
      Math.max(12, canvasSize.width - 12),
    ),
    top: clamp(
      viewport.y +
        (sourceLayer.y + sourceLayer.height) * viewport.scale +
        12,
      12,
      Math.max(12, canvasSize.height - 360),
    ),
  };
}

export function resolveCharacterAnimationPanelStyle({
  panel,
  sourceLayer,
  viewport,
  canvasSize,
}: {
  panel: CharacterAnimationPanelState | null;
  sourceLayer: CanvasLayer | null;
  viewport: CanvasViewport;
  canvasSize: CanvasSize;
}): CanvasOverlayStyle | null {
  if (!panel || !sourceLayer) {
    return null;
  }
  return {
    left: clamp(
      viewport.x +
        (sourceLayer.x + sourceLayer.width) * viewport.scale +
        12,
      12,
      Math.max(12, canvasSize.width - 364),
    ),
    top: clamp(
      viewport.y + sourceLayer.y * viewport.scale,
      12,
      Math.max(12, canvasSize.height - 520),
    ),
  };
}

export function isCanvasGenerationComposerVisible(
  dialog: GenerateDialogState | null,
): dialog is GenerateDialogState & { mode: CanvasGenerationDialogMode } {
  return (
    dialog?.mode === 'generate' ||
    dialog?.mode === 'spec' ||
    dialog?.mode === 'character' ||
    dialog?.mode === 'icon'
  );
}