import { observable, action, computed, makeObservable, runInAction, autorun } from "mobx";
// store
import { RootStore } from "../root";
// types
import { IIssue } from "types";
// services
import { IssueService } from "services/issue";
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 IIssueStore {
  loader: "initial-load" | "mutation" | null;
  error: any | null;

  // issues
  issues: {
    [project_id: string]: {
      grouped: IIssueGroupedStructure;
      groupWithSubGroups: IIssueGroupWithSubGroupsStructure;
      ungrouped: IIssueUnGroupedStructure;
    };
  };
  // computed
  getIssueType: IIssueType | null;
  getIssues: IIssueGroupedStructure | IIssueGroupWithSubGroupsStructure | IIssueUnGroupedStructure | null;
  getIssuesCount: number;
  // action
  fetchIssues: (workspaceSlug: string, projectId: string, loadType?: "initial-load" | "mutation") => Promise<any>;
  updateIssueStructure: (group_id: string | null, sub_group_id: string | null, issue: IIssue) => void;
  removeIssueFromStructure: (group_id: string | null, sub_group_id: string | null, issue: IIssue) => void;
  updateGanttIssueStructure: (workspaceSlug: string, issue: IIssue, payload: IBlockUpdateData) => void;
}

export class IssueStore implements IIssueStore {
  loader: "initial-load" | "mutation" | null = null;
  error: any | null = null;
  issues: {
    [project_id: string]: {
      grouped: {
        [group_id: string]: IIssue[];
      };
      groupWithSubGroups: {
        [group_id: string]: {
          [sub_group_id: string]: IIssue[];
        };
      };
      ungrouped: IIssue[];
    };
  } = {};
  // service
  issueService;
  rootStore;

  constructor(_rootStore: RootStore) {
    makeObservable(this, {
      // observable
      loader: observable.ref,
      error: observable.ref,
      issues: observable.ref,
      // computed
      getIssueType: computed,
      getIssues: computed,
      getIssuesCount: computed,
      // actions
      fetchIssues: action,
      updateIssueStructure: action,
      removeIssueFromStructure: action,
      updateGanttIssueStructure: action,
    });

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

    autorun(() => {
      const workspaceSlug = this.rootStore.workspace.workspaceSlug;
      const projectId = this.rootStore.project.projectId;
      const hasPermissionToCurrentProject = this.rootStore.user.hasPermissionToCurrentProject;
      if (
        workspaceSlug &&
        projectId &&
        hasPermissionToCurrentProject &&
        this.rootStore.issueFilter.userFilters &&
        this.rootStore.issueFilter.userDisplayFilters
      )
        this.fetchIssues(workspaceSlug, projectId, "mutation");
    });
  }

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

    const issueLayout = this.rootStore?.issueFilter?.userDisplayFilters?.layout || null;
    const issueGroup = this.rootStore?.issueFilter?.userDisplayFilters?.group_by || null;
    const issueSubGroup = this.rootStore?.issueFilter?.userDisplayFilters?.sub_group_by || null;
    if (!issueLayout) return null;

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

    return _issueState || null;
  }

  get getIssues() {
    const projectId: string | null = this.rootStore?.project?.projectId;
    const issueType = this.getIssueType;
    if (!projectId || !issueType) return null;

    return this.issues?.[projectId]?.[issueType] || null;
  }

  get getIssuesCount() {
    const issueType = this.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 projectId: string | null = issue?.project;
    const issueType = this.getIssueType;
    if (!projectId || !issueType) return null;

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

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

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

  removeIssueFromStructure = (group_id: string | null, sub_group_id: string | null, issue: IIssue) => {
    const projectId: string | null = issue?.project;
    const issueType = this.getIssueType;
    if (!projectId || !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.issues = { ...this.issues, [projectId]: { ...this.issues[projectId], [issueType]: issues } };
    });
  };

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

    const issues = this.getIssues as IIssueUnGroupedStructure;

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

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

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

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

  fetchIssues = async (
    workspaceSlug: string,
    projectId: string,
    loadType: "initial-load" | "mutation" = "initial-load"
  ) => {
    try {
      this.loader = loadType;
      this.error = null;

      this.rootStore.workspace.setWorkspaceSlug(workspaceSlug);
      this.rootStore.project.setProjectId(projectId);

      const params = this.rootStore?.issueFilter?.appliedFilters;
      const issueResponse = await this.issueService.getIssuesWithParams(workspaceSlug, projectId, params);

      const issueType = this.getIssueType;
      if (issueType != null) {
        const _issues = {
          ...this.issues,
          [projectId]: {
            ...this.issues[projectId],
            [issueType]: issueResponse,
          },
        };
        runInAction(() => {
          this.issues = _issues;
          this.loader = null;
          this.error = null;
        });
      }

      return issueResponse;
    } catch (error) {
      console.error("Error: Fetching error in issues", error);
      this.loader = null;
      this.error = error;
      return error;
    }
  };
}
