import differenceInCalendarDays from "date-fns/differenceInCalendarDays";
import { v4 as uuidv4 } from "uuid";
// types
import {
  TGroupedIssues,
  TIssue,
  TIssueGroupByOptions,
  TIssueOrderByOptions,
  TIssueParams,
  TStateGroups,
  TSubGroupedIssues,
  TUnGroupedIssues,
} from "@plane/types";
import { IGanttBlock } from "@/components/gantt-chart";
// constants
import { EIssueLayoutTypes, ISSUE_DISPLAY_FILTERS_BY_LAYOUT } from "@/constants/issue";
import { STATE_GROUPS } from "@/constants/state";
// helpers
import { orderArrayBy } from "@/helpers/array.helper";
import { getDate } from "@/helpers/date-time.helper";

type THandleIssuesMutation = (
  formData: Partial<TIssue>,
  oldGroupTitle: string,
  selectedGroupBy: TIssueGroupByOptions,
  issueIndex: number,
  orderBy: TIssueOrderByOptions,
  prevData?:
    | {
        [key: string]: TIssue[];
      }
    | TIssue[]
) =>
  | {
      [key: string]: TIssue[];
    }
  | TIssue[]
  | undefined;

export const handleIssuesMutation: THandleIssuesMutation = (
  formData,
  oldGroupTitle,
  selectedGroupBy,
  issueIndex,
  orderBy,
  prevData
) => {
  if (!prevData) return prevData;

  if (Array.isArray(prevData)) {
    const updatedIssue = {
      ...prevData[issueIndex],
      ...formData,
    };

    prevData.splice(issueIndex, 1, updatedIssue);

    return [...prevData];
  } else {
    const oldGroup = prevData[oldGroupTitle ?? ""] ?? [];

    let newGroup: TIssue[] = [];

    if (selectedGroupBy === "priority") newGroup = prevData[formData.priority ?? ""] ?? [];
    else if (selectedGroupBy === "state") newGroup = prevData[formData.state_id ?? ""] ?? [];

    const updatedIssue = {
      ...oldGroup[issueIndex],
      ...formData,
    };

    if (selectedGroupBy !== Object.keys(formData)[0])
      return {
        ...prevData,
        [oldGroupTitle ?? ""]: orderArrayBy(
          oldGroup.map((i) => (i.id === updatedIssue.id ? updatedIssue : i)),
          orderBy
        ),
      };

    const groupThatIsUpdated = selectedGroupBy === "priority" ? formData.priority : formData.state_id;

    return {
      ...prevData,
      [oldGroupTitle ?? ""]: orderArrayBy(
        oldGroup.filter((i) => i.id !== updatedIssue.id),
        orderBy
      ),
      [groupThatIsUpdated ?? ""]: orderArrayBy([...newGroup, updatedIssue], orderBy),
    };
  }
};

export const handleIssueQueryParamsByLayout = (
  layout: EIssueLayoutTypes | undefined,
  viewType: "my_issues" | "issues" | "profile_issues" | "archived_issues" | "draft_issues"
): TIssueParams[] | null => {
  const queryParams: TIssueParams[] = [];

  if (!layout) return null;

  const layoutOptions = ISSUE_DISPLAY_FILTERS_BY_LAYOUT[viewType][layout];

  // add filters query params
  layoutOptions.filters.forEach((option) => {
    queryParams.push(option);
  });

  // add display filters query params
  Object.keys(layoutOptions.display_filters).forEach((option) => {
    queryParams.push(option as TIssueParams);
  });

  // add extra options query params
  if (layoutOptions.extra_options.access) {
    layoutOptions.extra_options.values.forEach((option) => {
      queryParams.push(option);
    });
  }

  return queryParams;
};

/**
 *
 * @description create a full issue payload with some default values. This function also parse the form field
 * like assignees, labels, etc. and add them to the payload
 * @param projectId project id to be added in the issue payload
 * @param formData partial issue data from the form. This will override the default values
 * @returns full issue payload with some default values
 */
export const createIssuePayload: (projectId: string, formData: Partial<TIssue>) => TIssue = (
  projectId: string,
  formData: Partial<TIssue>
) => {
  const payload: TIssue = {
    id: uuidv4(),
    project_id: projectId,
    priority: "none",
    // tempId is used for optimistic updates. It is not a part of the API response.
    tempId: uuidv4(),
    // to be overridden by the form data
    ...formData,
  } as TIssue;

  return payload;
};

/**
 * @description check if the issue due date should be highlighted
 * @param date
 * @param stateGroup
 * @returns boolean
 */
export const shouldHighlightIssueDueDate = (
  date: string | Date | null,
  stateGroup: TStateGroups | undefined
): boolean => {
  if (!date || !stateGroup) return false;
  // if the issue is completed or cancelled, don't highlight the due date
  if ([STATE_GROUPS.completed.key, STATE_GROUPS.cancelled.key].includes(stateGroup)) return false;

  const parsedDate = getDate(date);
  if (!parsedDate) return false;

  const targetDateDistance = differenceInCalendarDays(parsedDate, new Date());

  // if the issue is overdue, highlight the due date
  return targetDateDistance <= 0;
};
export const getIssueBlocksStructure = (block: TIssue): IGanttBlock => {
  return {
    data: block,
    id: block?.id,
    sort_order: block?.sort_order,
    start_date: getDate(block?.start_date),
    target_date: getDate(block?.target_date),
  };};

export function getChangedIssuefields(formData: Partial<TIssue>, dirtyFields: { [key: string]: boolean | undefined }) {
  const changedFields: Partial<TIssue> = {};

  const dirtyFieldKeys = Object.keys(dirtyFields) as (keyof TIssue)[];
  for (const dirtyField of dirtyFieldKeys) {
    if (!!dirtyFields[dirtyField]) {
      changedFields[dirtyField] = formData[dirtyField];
    }
  }

  return changedFields;
}

export const formatTextList = (TextArray: string[]): string => {
  const count = TextArray.length;
  switch (count) {
    case 0:
      return "";
    case 1:
      return TextArray[0];
    case 2:
      return `${TextArray[0]} and ${TextArray[1]}`;
    case 3:
      return `${TextArray.slice(0, 2).join(", ")}, and ${TextArray[2]}`;
    case 4:
      return `${TextArray.slice(0, 3).join(", ")}, and ${TextArray[3]}`;
    default:
      return `${TextArray.slice(0, 3).join(", ")}, and +${count - 3} more`;
  }
};

export const getDescriptionPlaceholder = (isFocused: boolean, description: string | undefined): string => {
  const isDescriptionEmpty = !description || description === "<p></p>" || description.trim() === "";
  if (!isDescriptionEmpty || isFocused) return "Press '/' for commands...";
  else return "Click to add description";
};

export const issueCountBasedOnFilters = (
  issueIds: TGroupedIssues | TUnGroupedIssues | TSubGroupedIssues,
  layout: EIssueLayoutTypes,
  groupBy: string | undefined,
  subGroupBy: string | undefined
): number => {
  let issuesCount = 0;
  if (!layout) return issuesCount;

  if (["spreadsheet", "gantt_chart"].includes(layout)) {
    issuesCount = (issueIds as TUnGroupedIssues)?.length;
  } else if (layout === "calendar") {
    Object.keys(issueIds || {}).map((groupId) => {
      issuesCount += (issueIds as TGroupedIssues)?.[groupId]?.length;
    });
  } else if (layout === "list") {
    if (groupBy) {
      Object.keys(issueIds || {}).map((groupId) => {
        issuesCount += (issueIds as TGroupedIssues)?.[groupId]?.length;
      });
    } else {
      issuesCount = (issueIds as TUnGroupedIssues)?.length;
    }
  } else if (layout === "kanban") {
    if (groupBy && subGroupBy) {
      Object.keys(issueIds || {}).map((groupId) => {
        Object.keys((issueIds as TSubGroupedIssues)?.[groupId] || {}).map((subGroupId) => {
          issuesCount += (issueIds as TSubGroupedIssues)?.[groupId]?.[subGroupId]?.length || 0;
        });
      });
    } else if (groupBy) {
      Object.keys(issueIds || {}).map((groupId) => {
        issuesCount += (issueIds as TGroupedIssues)?.[groupId]?.length;
      });
    }
  }

  return issuesCount;
};