import { observable, action, makeObservable, runInAction, computed, autorun } from "mobx";
// services
import { IssueService } from "services/issue";
// helpers
import { handleIssueQueryParamsByLayout } from "helpers/issue.helper";
import { sortArrayByDate, sortArrayByPriority } from "constants/kanban-helpers";
// types
import { RootStore } from "../root";
import { IIssue, IIssueFilterOptions } from "types";
import { IBlockUpdateData } from "components/gantt-chart";

export type IIssueType = "grouped" | "groupWithSubGroups" | "ungrouped";
export type IIssueGroupedStructure = { [group_id: string]: IIssue[] };
export type IIssueGroupWithSubGroupsStructure = {
  [group_id: string]: {
    [sub_group_id: string]: IIssue[];
  };
};
export type IIssueUnGroupedStructure = IIssue[];

export interface IProjectViewIssuesStore {
  // states
  loader: boolean;
  error: any | null;

  // observables
  viewIssues: {
    [viewId: string]: {
      grouped: IIssueGroupedStructure;
      groupWithSubGroups: IIssueGroupWithSubGroupsStructure;
      ungrouped: IIssueUnGroupedStructure;
    };
  };

  // actions
  updateIssueStructure: (group_id: string | null, sub_group_id: string | null, issue: IIssue) => void;
  updateGanttIssueStructure: (workspaceSlug: string, viewId: string, issue: IIssue, payload: IBlockUpdateData) => void;
  deleteIssue: (group_id: string | null, sub_group_id: string | null, issue: IIssue) => void;
  fetchViewIssues: (
    workspaceSlug: string,
    projectId: string,
    viewId: string,
    filters: IIssueFilterOptions
  ) => Promise<any>;

  // computed
  getIssues: IIssueGroupedStructure | IIssueGroupWithSubGroupsStructure | IIssueUnGroupedStructure | null;
  getIssuesCount: number;
  getIssueType: IIssueType | null;
}

export class ProjectViewIssuesStore implements IProjectViewIssuesStore {
  // states
  loader: boolean = false;
  error: any | null = null;

  // observables
  viewIssues: {
    [viewId: string]: {
      grouped: IIssueGroupedStructure;
      groupWithSubGroups: IIssueGroupWithSubGroupsStructure;
      ungrouped: IIssueUnGroupedStructure;
    };
  } = {};

  // root store
  rootStore;

  // services
  issueService;

  constructor(_rootStore: RootStore) {
    makeObservable(this, {
      // states
      loader: observable.ref,
      error: observable.ref,

      // observables
      viewIssues: observable.ref,

      // actions
      updateIssueStructure: action,
      updateGanttIssueStructure: action,
      deleteIssue: action,
      fetchViewIssues: action,

      // computed
      getIssueType: computed,
      getIssues: computed,
      getIssuesCount: computed,
    });

    this.rootStore = _rootStore;
    this.issueService = new IssueService();

    autorun(() => {
      const workspaceSlug = this.rootStore.workspace.workspaceSlug;
      const projectId = this.rootStore.project.projectId;
      const viewId = this.rootStore.projectViews.viewId;

      if (
        workspaceSlug &&
        projectId &&
        viewId &&
        this.rootStore.projectViewFilters.storedFilters[viewId] &&
        this.rootStore.issueFilter.userDisplayFilters
      )
        this.fetchViewIssues(workspaceSlug, projectId, viewId, this.rootStore.projectViewFilters.storedFilters[viewId]);
    });
  }

  computedFilter = (filters: any, filteredParams: any) => {
    const computedFilters: any = {};
    Object.keys(filters).map((key) => {
      if (filters[key] != undefined && filteredParams.includes(key))
        computedFilters[key] =
          typeof filters[key] === "string" || typeof filters[key] === "boolean" ? filters[key] : filters[key].join(",");
    });

    return computedFilters;
  };

  get getIssueType() {
    const groupedLayouts = ["kanban", "list", "calendar"];
    const ungroupedLayouts = ["spreadsheet", "gantt_chart"];

    const issueLayout = this.rootStore?.issueFilter?.userDisplayFilters?.layout || null;
    const issueSubGroup = this.rootStore?.issueFilter?.userDisplayFilters?.sub_group_by || null;

    if (!issueLayout) return null;

    const _issueState = groupedLayouts.includes(issueLayout)
      ? issueSubGroup
        ? "groupWithSubGroups"
        : "grouped"
      : ungroupedLayouts.includes(issueLayout)
      ? "ungrouped"
      : null;

    return _issueState || null;
  }

  get getIssues() {
    const viewId: string | null = this.rootStore.projectViews.viewId;
    const issueType = this.rootStore.issue.getIssueType;

    if (!viewId || !issueType) return null;

    return this.viewIssues?.[viewId]?.[issueType] || null;
  }

  get getIssuesCount() {
    const issueType = this.rootStore.issue.getIssueType;

    let issuesCount = 0;

    if (issueType === "grouped") {
      const issues = this.getIssues as IIssueGroupedStructure;

      if (!issues) return 0;

      Object.keys(issues).map((group_id) => {
        issuesCount += issues[group_id].length;
      });
    }

    if (issueType === "groupWithSubGroups") {
      const issues = this.getIssues as IIssueGroupWithSubGroupsStructure;

      if (!issues) return 0;

      Object.keys(issues).map((sub_group_id) => {
        Object.keys(issues[sub_group_id]).map((group_id) => {
          issuesCount += issues[sub_group_id][group_id].length;
        });
      });
    }

    if (issueType === "ungrouped") {
      const issues = this.getIssues as IIssueUnGroupedStructure;

      if (!issues) return 0;

      issuesCount = issues.length;
    }

    return issuesCount;
  }

  updateIssueStructure = async (group_id: string | null, sub_group_id: string | null, issue: IIssue) => {
    const viewId: string | null = this.rootStore.projectViews.viewId;
    const issueType = this.rootStore.issue.getIssueType;
    if (!viewId || !issueType) return null;

    let issues: IIssueGroupedStructure | IIssueGroupWithSubGroupsStructure | IIssueUnGroupedStructure | null =
      this.getIssues;
    if (!issues) return null;

    if (issueType === "grouped" && group_id) {
      issues = issues as IIssueGroupedStructure;
      issues = {
        ...issues,
        [group_id]: issues[group_id].map((i: IIssue) => (i?.id === issue?.id ? { ...i, ...issue } : i)),
      };
    }
    if (issueType === "groupWithSubGroups" && group_id && sub_group_id) {
      issues = issues as IIssueGroupWithSubGroupsStructure;
      issues = {
        ...issues,
        [sub_group_id]: {
          ...issues[sub_group_id],
          [group_id]: issues[sub_group_id][group_id].map((i) => (i?.id === issue?.id ? { ...i, ...issue } : i)),
        },
      };
    }
    if (issueType === "ungrouped") {
      issues = issues as IIssueUnGroupedStructure;
      issues = issues.map((i) => (i?.id === issue?.id ? { ...i, ...issue } : i));
    }

    const orderBy = this.rootStore?.issueFilter?.userDisplayFilters?.order_by || "";
    if (orderBy === "-created_at") {
      issues = sortArrayByDate(issues as any, "created_at");
    }
    if (orderBy === "-updated_at") {
      issues = sortArrayByDate(issues as any, "updated_at");
    }
    if (orderBy === "start_date") {
      issues = sortArrayByDate(issues as any, "updated_at");
    }
    if (orderBy === "priority") {
      issues = sortArrayByPriority(issues as any, "priority");
    }

    runInAction(() => {
      this.viewIssues = { ...this.viewIssues, [viewId]: { ...this.viewIssues[viewId], [issueType]: issues } };
    });
  };

  updateGanttIssueStructure = async (
    workspaceSlug: string,
    viewId: string,
    issue: IIssue,
    payload: IBlockUpdateData
  ) => {
    if (!issue || !workspaceSlug) return;

    const issues = this.getIssues as IIssueUnGroupedStructure;

    const newIssues = issues.map((i) => ({
      ...i,
      ...(i.id === issue.id
        ? {
            sort_order: payload.sort_order?.newSortOrder ?? i.sort_order,
            start_date: payload.start_date,
            target_date: payload.target_date,
          }
        : {}),
    }));

    if (payload.sort_order) {
      const removedElement = newIssues.splice(payload.sort_order.sourceIndex, 1)[0];
      removedElement.sort_order = payload.sort_order.newSortOrder;
      newIssues.splice(payload.sort_order.destinationIndex, 0, removedElement);
    }

    runInAction(() => {
      this.viewIssues = {
        ...this.viewIssues,
        [viewId]: {
          ...this.viewIssues[viewId],
          ungrouped: newIssues,
        },
      };
    });

    const newPayload: any = { ...payload };

    if (newPayload.sort_order && payload.sort_order) newPayload.sort_order = payload.sort_order.newSortOrder;

    this.rootStore.issueDetail.updateIssue(workspaceSlug, issue.project, issue.id, newPayload);
  };

  deleteIssue = async (group_id: string | null, sub_group_id: string | null, issue: IIssue) => {
    const viewId: string | null = this.rootStore.projectViews.viewId;
    const issueType = this.rootStore.issue.getIssueType;
    if (!viewId || !issueType) return null;

    let issues: IIssueGroupedStructure | IIssueGroupWithSubGroupsStructure | IIssueUnGroupedStructure | null =
      this.getIssues;
    if (!issues) return null;

    if (issueType === "grouped" && group_id) {
      issues = issues as IIssueGroupedStructure;
      issues = {
        ...issues,
        [group_id]: issues[group_id].filter((i) => i?.id !== issue?.id),
      };
    }
    if (issueType === "groupWithSubGroups" && group_id && sub_group_id) {
      issues = issues as IIssueGroupWithSubGroupsStructure;
      issues = {
        ...issues,
        [sub_group_id]: {
          ...issues[sub_group_id],
          [group_id]: issues[sub_group_id][group_id].filter((i) => i?.id !== issue?.id),
        },
      };
    }
    if (issueType === "ungrouped") {
      issues = issues as IIssueUnGroupedStructure;
      issues = issues.filter((i) => i?.id !== issue?.id);
    }

    runInAction(() => {
      this.viewIssues = { ...this.viewIssues, [viewId]: { ...this.viewIssues[viewId], [issueType]: issues } };
    });
  };

  fetchViewIssues = async (workspaceSlug: string, projectId: string, viewId: string, filters: IIssueFilterOptions) => {
    try {
      runInAction(() => {
        this.loader = true;
      });

      const displayFilters = this.rootStore.issueFilter.userDisplayFilters;

      let filteredRouteParams: any = {
        priority: filters?.priority || undefined,
        state_group: filters?.state_group || undefined,
        state: filters?.state || undefined,
        assignees: filters?.assignees || undefined,
        created_by: filters?.created_by || undefined,
        labels: filters?.labels || undefined,
        start_date: filters?.start_date || undefined,
        target_date: filters?.target_date || undefined,
        group_by: displayFilters?.group_by || undefined,
        order_by: displayFilters?.order_by || "-created_at",
        type: displayFilters?.type || undefined,
        sub_issue: displayFilters.sub_issue || undefined,
        sub_group_by: displayFilters.sub_group_by || undefined,
      };

      const filteredParams = handleIssueQueryParamsByLayout(displayFilters.layout ?? "list", "issues");
      if (filteredParams) filteredRouteParams = this.computedFilter(filteredRouteParams, filteredParams);

      if (displayFilters.layout === "calendar") filteredRouteParams.group_by = "target_date";
      if (displayFilters.layout === "gantt_chart") filteredRouteParams.start_target_date = true;

      const response = await this.issueService.getIssuesWithParams(workspaceSlug, projectId, filteredRouteParams);

      const issueType = this.rootStore.issue.getIssueType;

      if (issueType != null) {
        const newIssues = {
          ...this.viewIssues,
          [viewId]: {
            ...this.viewIssues[viewId],
            [issueType]: response,
          },
        };

        runInAction(() => {
          this.loader = false;
          this.viewIssues = newIssues;
        });
      }

      return response;
    } catch (error) {
      runInAction(() => {
        this.loader = false;
        this.error = error;
      });

      throw error;
    }
  };
}