import type {
  AlignmentColumnData,
  FlexLayer,
  LayerChild,
} from "./autoLayoutTypes";
import {
  FLEXBOX_PADDING,
  layoutConfigurations,
  GridDefaults,
  MAIN_CONTAINER_WIDGET_ID,
  WIDGET_PADDING,
  DefaultDimensionMap,
  AUTO_LAYOUT_CONTAINER_PADDING,
  MAX_MODAL_WIDTH_FROM_MAIN_WIDTH,
} from "constants/WidgetConstants";
import type {
  CanvasWidgetsReduxState,
  FlattenedWidgetProps,
} from "reducers/entityReducers/canvasWidgetsReducer";
import { AppPositioningTypes } from "reducers/entityReducers/pageListReducer";
import {
  defaultAutoLayoutWidgets,
  FlexLayerAlignment,
  Positioning,
  ResponsiveBehavior,
  SNAPSHOT_EXPIRY_IN_DAYS,
} from "utils/autoLayout/constants";
import {
  updatePositionsOfParentAndSiblings,
  updateWidgetPositions,
} from "utils/autoLayout/positionUtils";
import type { AlignmentColumnInfo } from "./autoLayoutTypes";
import { getWidgetWidth } from "./flexWidgetUtils";
import type { DSLWidget } from "widgets/constants";
import { getHumanizedTime, getReadableDateInFormat } from "utils/dayJsUtils";
import WidgetFactory from "utils/WidgetFactory";
import { isFunction } from "lodash";

export type ReadableSnapShotDetails = {
  timeSince: string;
  timeTillExpiration: string;
  readableDate: string;
};

/**
 * Update flex layers of parent canvas upon deleting a child widget.
 * Logic:
 * 1. Find the layer in which the deleted widget exists.
 *   - Parse all flex layers, checking for deleted widgetId.
 *   - If found, use the index of the flex layer to update it.
 * 2. Update the flex layer.
 *  - Remove the deleted widget from the children array.
 * 3. Recalculate the dimensions of the canvas and it's widgets.
 * @param allWidgets | CanvasWidgetsReduxState : All widgets.
 * @param widgetId | string : id of widget to be deleted.
 * @param parentId | string : Parent widget id.
 * @param isMobile | boolean : Is the canvas mobile.
 * @param mainCanvasWidth | number : Width of the main canvas.
 * @param metaProps | Record<string, any> : Meta properties of the widget.
 * @returns CanvasWidgetsReduxState
 */
export function updateFlexLayersOnDelete(
  allWidgets: CanvasWidgetsReduxState,
  widgetId: string,
  parentId: string,
  isMobile: boolean,
  mainCanvasWidth: number,
  metaProps?: Record<string, any>,
): CanvasWidgetsReduxState {
  const widgets = { ...allWidgets };
  if (
    widgets[MAIN_CONTAINER_WIDGET_ID].appPositioningType ===
      AppPositioningTypes.FIXED ||
    widgets[MAIN_CONTAINER_WIDGET_ID].positioning === Positioning.Fixed
  )
    return widgets;
  let parent = widgets[parentId];
  if (!parent) return widgets;

  let flexLayers = [...(parent.flexLayers || [])];
  if (!flexLayers.length) return widgets;
  let layerIndex = -1; // Find the layer in which the deleted widget exists.
  let index = 0;
  let updatedChildren: LayerChild[] = [];
  for (const layer of flexLayers) {
    const children = layer.children || [];
    if (!children.length) continue;
    const childIndex = children.findIndex(
      (each: LayerChild) => each.id === widgetId,
    );
    if (childIndex === -1) {
      index += 1;
      continue;
    }

    updatedChildren = children.filter(
      (each: LayerChild) => each.id !== widgetId,
    );
    layerIndex = index;
    break;
  }
  if (layerIndex === -1) return widgets;

  flexLayers = [
    ...flexLayers.slice(0, layerIndex),
    {
      children: updatedChildren,
    },
    ...flexLayers.slice(layerIndex + 1),
  ].filter((layer: FlexLayer) => layer?.children?.length);

  parent = {
    ...parent,
    flexLayers: flexLayers.filter(
      (layer: FlexLayer) => layer?.children?.length,
    ),
  };
  widgets[parentId] = parent;

  return updatePositionsOfParentAndSiblings(
    widgets,
    parentId,
    layerIndex,
    isMobile,
    mainCanvasWidth,
    false,
    metaProps,
  );
}

export function alterLayoutForMobile(
  allWidgets: CanvasWidgetsReduxState,
  parentId: string,
  canvasWidth: number,
  mainCanvasWidth: number,
  firstTimeDSLUpdate = false,
  metaProps?: Record<string, any>,
): CanvasWidgetsReduxState {
  let widgets = { ...allWidgets };
  const parent = widgets[parentId];
  const children = parent.children;

  if (!isStack(allWidgets, parent)) {
    return widgets;
  }
  if (!children || !children.length) return widgets;

  for (const child of children) {
    const widget = { ...widgets[child] };
    const widgetWidth: number =
      widget.type === "MODAL_WIDGET"
        ? canvasWidth * MAX_MODAL_WIDTH_FROM_MAIN_WIDTH
        : (canvasWidth * (widget.mobileRightColumn || 1)) /
          GridDefaults.DEFAULT_GRID_COLUMNS;
    widgets = alterLayoutForMobile(
      widgets,
      child,
      widgetWidth,
      mainCanvasWidth,
      firstTimeDSLUpdate,
      metaProps,
    );
    widgets[child] = widget;
    widgets = updateWidgetPositions(
      widgets,
      child,
      true,
      mainCanvasWidth,
      firstTimeDSLUpdate,
      metaProps,
    );
  }
  widgets = updateWidgetPositions(
    widgets,
    parentId,
    true,
    mainCanvasWidth,
    firstTimeDSLUpdate,
    metaProps,
  );
  return widgets;
}

export function alterLayoutForDesktop(
  allWidgets: CanvasWidgetsReduxState,
  parentId: string,
  mainCanvasWidth: number,
  firstTimeDSLUpdate = false,
  metaProps?: Record<string, any>,
): CanvasWidgetsReduxState {
  let widgets = { ...allWidgets };
  const parent = widgets[parentId];
  const children = parent.children;

  if (!isStack(allWidgets, parent)) {
    return widgets;
  }
  if (!children || (!children.length && parent.type !== "CANVAS_WIDGET")) {
    return widgets;
  }

  widgets = updateWidgetPositions(
    widgets,
    parentId,
    false,
    mainCanvasWidth,
    firstTimeDSLUpdate,
    metaProps,
  );
  for (const child of children) {
    widgets = alterLayoutForDesktop(
      widgets,
      child,
      mainCanvasWidth,
      firstTimeDSLUpdate,
      metaProps,
    );
  }
  return widgets;
}

/**
 * START: COPY PASTE UTILS
 */

export function pasteWidgetInFlexLayers(
  allWidgets: CanvasWidgetsReduxState,
  parentId: string,
  widget: any,
  originalWidgetId: string,
  isMobile: boolean,
  mainCanvasWidth: number,
  metaProps?: Record<string, any>,
): CanvasWidgetsReduxState {
  let widgets = { ...allWidgets };
  const parent = widgets[parentId];
  let flexLayers: FlexLayer[] = parent.flexLayers || [];
  let flexLayerIndex = -1;
  /**
   * If the new parent is not the same as the original parent,
   * then add a new flex layer.
   */
  if (
    !widgets[originalWidgetId] ||
    widgets[originalWidgetId].parentId !== parentId
  ) {
    flexLayers = [
      ...flexLayers,
      {
        children: [
          {
            id: widget.widgetId,
            align: FlexLayerAlignment.Start,
          },
        ],
      },
    ];
  } else {
    /**
     * If the new parent is the same as the original parent,
     * then update the flex layer.
     */
    let rowIndex = -1,
      alignment = FlexLayerAlignment.Start;
    flexLayerIndex = flexLayers.findIndex((layer: FlexLayer) => {
      const temp = layer.children.findIndex(
        (child: LayerChild) => child.id === originalWidgetId,
      );
      if (temp > -1) {
        rowIndex = temp;
        alignment = layer.children[temp].align;
      }
      return temp > -1;
    });
    if (flexLayerIndex > -1 && rowIndex > -1) {
      let selectedLayer = flexLayers[flexLayerIndex];
      selectedLayer = {
        children: [
          ...selectedLayer.children.slice(0, rowIndex + 1),
          { id: widget.widgetId, align: alignment },
          ...selectedLayer.children.slice(rowIndex + 1),
        ],
      };
      flexLayers = [
        ...flexLayers.slice(0, flexLayerIndex),
        selectedLayer,
        ...flexLayers.slice(flexLayerIndex + 1),
      ];
    }
  }
  widgets = {
    ...widgets,
    [parentId]: {
      ...parent,
      flexLayers,
    },
  };
  return updatePositionsOfParentAndSiblings(
    widgets,
    parentId,
    flexLayerIndex,
    isMobile,
    mainCanvasWidth,
    false,
    metaProps,
  );
}

/**
 * Add nested children to flex layers of the new pasted canvas.
 * The flexLayers get copied from the original canvas.
 * This method matches the copied widgetId with the original widgetId
 * and replaces them in position.
 */
export function addChildToPastedFlexLayers(
  allWidgets: CanvasWidgetsReduxState,
  widget: any,
  widgetIdMap: Record<string, string>,
  isMobile: boolean,
  mainCanvasWidth: number,
  metaProps?: Record<string, any>,
): CanvasWidgetsReduxState {
  let widgets = { ...allWidgets };
  const parent = widgets[widget.parentId];
  const flexLayers = parent.flexLayers || [];
  if (flexLayers.length > 0) {
    let index = 0;
    for (const layer of flexLayers) {
      let children = layer.children;
      let childIndex = 0;
      for (const child of children) {
        if (widgetIdMap[child.id] === widget.widgetId) {
          children = [
            ...children.slice(0, childIndex),
            { id: widget.widgetId, align: child.align },
            ...children.slice(childIndex + 1),
          ];
        }
        childIndex += 1;
      }
      flexLayers[index] = {
        children,
      };
      index += 1;
    }
  }
  widgets = {
    ...widgets,
    [parent.widgetId]: {
      ...parent,
      flexLayers,
    },
  };
  return updateWidgetPositions(
    widgets,
    parent.widgetId,
    isMobile,
    mainCanvasWidth,
    false,
    metaProps,
  );
}

export function isStack(
  allWidgets: CanvasWidgetsReduxState,
  widget: any,
): boolean {
  let parent = widget.parentId ? allWidgets[widget.parentId] : undefined;
  if (parent && parent.type === "CANVAS_WIDGET" && parent.parentId)
    parent = allWidgets[parent.parentId];
  return (
    widget.positioning === Positioning.Vertical ||
    ((parent && defaultAutoLayoutWidgets.includes(parent.type)) ||
    parent?.widgetId === MAIN_CONTAINER_WIDGET_ID
      ? allWidgets[MAIN_CONTAINER_WIDGET_ID].positioning ===
        Positioning.Vertical
      : false)
  );
}

/**
 * END: copy paste utils
 */

export function getLayerIndexOfWidget(
  flexLayers: FlexLayer[],
  widgetId: string,
): number {
  if (!flexLayers) return -1;
  return flexLayers.findIndex((layer: FlexLayer) => {
    return (
      layer.children.findIndex((child: LayerChild) => child.id === widgetId) !==
      -1
    );
  });
}

export function getViewportClassName(viewportWidth: number) {
  if (viewportWidth > layoutConfigurations.MOBILE.maxWidth) {
    return "desktop-view";
  } else {
    return "mobile-view";
  }
}

export function getFillWidgetLengthForLayer(
  layer: any,
  allWidgets: any,
  dimensionMap = DefaultDimensionMap,
): number | undefined {
  let fillLength = GridDefaults.DEFAULT_GRID_COLUMNS;
  let hugLength = 0,
    fillCount = 0;
  const { leftColumn: leftColumnMap, rightColumn: rightColumnMap } =
    dimensionMap;
  for (const child of layer.children) {
    const childWidget = allWidgets[child.id];
    if (!childWidget) {
      continue;
    }
    if (childWidget.responsiveBehavior !== ResponsiveBehavior.Fill) {
      hugLength += childWidget[rightColumnMap] - childWidget[leftColumnMap];
    } else {
      fillCount += 1;
    }
  }
  fillLength = (fillLength - hugLength) / (fillCount || 1);
  return fillLength;
}

export function getAlignmentColumnInfo(
  widgets: CanvasWidgetsReduxState,
  layer: FlexLayer,
  isMobile: boolean,
): AlignmentColumnInfo {
  if (!layer)
    return {
      [FlexLayerAlignment.Start]: 0,
      [FlexLayerAlignment.Center]: 0,
      [FlexLayerAlignment.End]: 0,
      [FlexLayerAlignment.None]: 0,
    };
  let start = 0,
    end = 0,
    center = 0;
  for (const child of layer.children) {
    const widget = widgets[child.id];
    if (!widget) continue;
    if (child.align === FlexLayerAlignment.End)
      end += getWidgetWidth(widget, isMobile);
    else if (child.align === FlexLayerAlignment.Center)
      center += getWidgetWidth(widget, isMobile);
    else start += getWidgetWidth(widget, isMobile);
  }
  return {
    [FlexLayerAlignment.Start]: start,
    [FlexLayerAlignment.Center]: center,
    [FlexLayerAlignment.End]: end,
    [FlexLayerAlignment.None]: 0,
  };
}

export function getCanvasDimensions(
  canvas: FlattenedWidgetProps,
  widgets: CanvasWidgetsReduxState,
  mainCanvasWidth: number,
  isMobile: boolean,
): { canvasWidth: number; columnSpace: number } {
  const canvasWidth: number = getCanvasWidth(
    canvas,
    widgets,
    mainCanvasWidth,
    isMobile,
  );

  const columnSpace: number = canvasWidth / GridDefaults.DEFAULT_GRID_COLUMNS;

  return { canvasWidth: canvasWidth, columnSpace };
}

function getCanvasWidth(
  canvas: FlattenedWidgetProps,
  widgets: CanvasWidgetsReduxState,
  mainCanvasWidth: number,
  isMobile: boolean,
): number {
  if (!mainCanvasWidth) return 0;
  if (canvas.widgetId === MAIN_CONTAINER_WIDGET_ID)
    return mainCanvasWidth - getPadding(canvas);

  const stack = [];
  let widget = canvas;
  while (widget.parentId) {
    stack.push(widget);
    widget = widgets[widget.parentId];

    //stop at modal
    if (widget.type === "MODAL_WIDGET") {
      break;
    }
  }
  stack.push(widget);

  let width = mainCanvasWidth;

  //modal will be the total width instead of the mainCanvasWidth
  if (widget.type === "MODAL_WIDGET") {
    width = Math.min(
      widget.width,
      mainCanvasWidth * MAX_MODAL_WIDTH_FROM_MAIN_WIDTH,
    );
  }

  while (stack.length) {
    const widget = stack.pop();
    if (!widget) continue;
    const columns = getWidgetWidth(widget, isMobile);
    const padding = getPadding(widget);
    const factor = widget.detachFromLayout
      ? 1
      : columns / GridDefaults.DEFAULT_GRID_COLUMNS;
    width = width * factor - padding;
  }

  return width;
}

function getPadding(canvas: FlattenedWidgetProps): number {
  let padding = 0;
  if (canvas.widgetId === MAIN_CONTAINER_WIDGET_ID) {
    padding = FLEXBOX_PADDING * 2;
  } else if (canvas.type === "CONTAINER_WIDGET") {
    padding = (AUTO_LAYOUT_CONTAINER_PADDING + FLEXBOX_PADDING) * 2;
  } else if (canvas.isCanvas) {
    padding = AUTO_LAYOUT_CONTAINER_PADDING * 2;
  }

  if (canvas.noPad) {
    padding -= WIDGET_PADDING;
  }

  return padding;
}

/**
 * This method preserves the flexLayers of the parent canvas,
 * but only for the selected widgets
 * @param selectedWidgets
 * @param parentCanvas
 * @returns
 */
export function getFlexLayersForSelectedWidgets(
  selectedWidgets: string[],
  parentCanvas: FlattenedWidgetProps | undefined,
): FlexLayer[] {
  if (
    !parentCanvas ||
    !parentCanvas.flexLayers ||
    parentCanvas.flexLayers.length <= 0
  )
    return [];

  const currFlexLayers: FlexLayer[] = parentCanvas.flexLayers;

  const selectedFlexLayers: FlexLayer[] = [];

  for (const flexLayer of currFlexLayers) {
    const layerChildren = [];

    for (const layerChild of flexLayer.children) {
      if (selectedWidgets.indexOf(layerChild.id) > -1) {
        layerChildren.push(layerChild);
      }
    }

    if (layerChildren.length > 0) {
      selectedFlexLayers.push({ children: layerChildren });
    }
  }

  return selectedFlexLayers;
}

/**
 * This method helps in Converting the widgetId inside flexLayers
 * to the new corresponding widgetIds in widgetIdMap
 * @param flexLayers
 * @param widgetIdMap
 * @returns
 */
export function getNewFlexLayers(
  flexLayers: FlexLayer[],
  widgetIdMap: Record<string, string>,
) {
  const newFlexLayers: FlexLayer[] = [];

  for (const flexLayer of flexLayers) {
    const newChildren = [];

    for (const layerChild of flexLayer.children) {
      if (widgetIdMap[layerChild.id]) {
        newChildren.push({
          id: widgetIdMap[layerChild.id],
          align: layerChild.align,
        });
      }
    }
    newFlexLayers.push({ children: newChildren });
  }

  return newFlexLayers;
}

export function checkIsDSLAutoLayout(dsl: DSLWidget): boolean {
  return dsl.useAutoLayout && dsl.positioning === Positioning.Vertical;
}

/**
 * Find out which alignment is placed in which row upon flex wrap.
 *
 * In case of flex wrap,
 * - alignments within a FlexLayer are placed in multiple rows.
 * Logic:
 *  - for each alignment in arr
 *    - if alignment.columns < 64
 *      -  add it to the current row (res[resIndex])
 *      - and track the total occupied columns in this row (total)
 *    - else
 *     - add the current row to the output rows
 *    - and start a new row to repeat the process recursively.
 * @param arr | AlignmentColumnData[]: array of alignment and its columns.
 * @param res | FlexLayerAlignment[][]: array of rows of alignments.
 * @param resIndex | number: index of the current row.
 * @returns FlexLayerAlignment[][]
 */
export function getLayerWrappingInfo(
  arr: AlignmentColumnData[],
  res: FlexLayerAlignment[][] = [[], [], []],
  resIndex = 0,
): FlexLayerAlignment[][] {
  if (arr.length === 0) return res;
  if (arr.length === 1) {
    res[resIndex].push(arr[0].alignment);
    return res;
  }
  let index = 0;
  let total = 0;
  for (const each of arr) {
    if (total + each.columns > GridDefaults.DEFAULT_GRID_COLUMNS) {
      let x = index;
      if (!res[resIndex].length) {
        res[resIndex].push(arr[0].alignment);
        x += 1;
      }
      return getLayerWrappingInfo(arr.slice(x), res, resIndex + 1);
    }
    total += each.columns;
    index += 1;
    res[resIndex].push(each.alignment);
  }
  return res;
}

/**
 * If a layer is flex wrapped, then individual sub-wrappers will have bottom margins, except the last sub-wrapper.
 * @param arr | AlignmentColumnData[]: array of alignment and its columns.
 * @param res | FlexLayerAlignment[][]: array of rows of alignments.
 * @param resIndex | number: index of the current row.
 * @returns boolean[]
 */
export function getAlignmentMarginInfo(
  arr: AlignmentColumnData[],
  res: FlexLayerAlignment[][] = [[], [], []],
  resIndex = 0,
): boolean[] {
  if (!arr.length) return [];
  const wrapInfo: FlexLayerAlignment[][] = getLayerWrappingInfo(
    arr,
    res,
    resIndex,
  );
  const marginInfo: {
    [key: string]: (arr: AlignmentColumnData[]) => boolean[];
  } = {
    // eslint-disable-next-line @typescript-eslint/no-unused-vars
    "300": (arr): boolean[] => [false, false, false],
    "120": (arr): boolean[] => [
      arr[0].columns > 0 && arr[1].columns + arr[2].columns > 0,
      false,
      false,
    ],
    "210": (arr): boolean[] => [
      arr[0].columns > 0 && arr[2].columns > 0,
      arr[1].columns > 0 && arr[2].columns > 0,
      false,
    ],
    "111": (arr): boolean[] => [
      arr[0].columns > 0,
      arr[1].columns > 0 && arr[2].columns > 0,
      false,
    ],
  };

  return marginInfo[wrapInfo.map((x) => x.length).join("")](arr);
}

/**
 * Gets readable values from the date String arguments
 * @param dateString
 * @returns
 */
export function getReadableSnapShotDetails(
  dateString: string | undefined,
): ReadableSnapShotDetails | undefined {
  if (!dateString) return;

  const lastUpdatedDate = new Date(dateString);

  if (Date.now() - lastUpdatedDate.getTime() <= 0) return;

  const millisecondsPerHour = 60 * 60 * 1000;
  const ExpirationInMilliseconds =
    SNAPSHOT_EXPIRY_IN_DAYS * 24 * millisecondsPerHour;
  const timePassedSince = Date.now() - lastUpdatedDate.getTime();

  const timeSince: string = getHumanizedTime(timePassedSince);
  const timeTillExpiration: string = getHumanizedTime(
    ExpirationInMilliseconds - timePassedSince,
  );

  const readableDate = getReadableDateInFormat(
    lastUpdatedDate,
    "Do MMMM, YYYY h:mm a",
  );

  return {
    timeSince,
    timeTillExpiration,
    readableDate,
  };
}

export function isWidgetSizeObserved(widget: FlattenedWidgetProps): boolean {
  const autoDimensionConfig = WidgetFactory.getWidgetAutoLayoutConfig(
    widget.type,
  ).autoDimension;

  const shouldObserveWidth = isFunction(autoDimensionConfig)
    ? autoDimensionConfig(widget).width
    : autoDimensionConfig?.width;
  const shouldObserveHeight = isFunction(autoDimensionConfig)
    ? autoDimensionConfig(widget).height
    : autoDimensionConfig?.height;
  return !!shouldObserveWidth || !!shouldObserveHeight;
}