import { observable, action, computed, makeObservable, runInAction } from "mobx";
// store
import { RootStore } from "./root";
// types
import { IIssue } from "types";
// services
import { IssueService } from "services/issue.service";

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: boolean;
  error: any | null;
  // issues
  issues: {
    [project_id: string]: {
      grouped: IIssueGroupedStructure;
      groupWithSubGroups: IIssueGroupWithSubGroupsStructure;
      ungrouped: IIssueUnGroupedStructure;
    };
  };
  // computed
  getIssueType: IIssueType | null;
  getIssues: IIssueGroupedStructure | IIssueGroupWithSubGroupsStructure | IIssueUnGroupedStructure | null;
  // action
  fetchIssues: (workspaceSlug: string, projectId: string) => Promise<any>;
  updateIssueStructure: (group_id: string | null, sub_group_id: string | null, issue: IIssue) => void;
}

class IssueStore implements IIssueStore {
  loader: boolean = false;
  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,
      // actions
      fetchIssues: action,
      updateIssueStructure: action,
    });
    this.rootStore = _rootStore;
    this.issueService = new IssueService();
  }

  get getIssueType() {
    const groupedLayouts = ["kanban", "list"];
    const ungroupedLayouts = ["calendar", "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 projectId: string | null = this.rootStore?.project?.projectId;
    const issueType = this.getIssueType;
    if (!projectId || !issueType) return null;

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

  updateIssueStructure = async (group_id: string | null, sub_group_id: string | null, issue: IIssue) => {
    const projectId: string | null = issue?.project;
    const issueType: IIssueType | null = 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].map((i: IIssue) => (i?.id === issue?.id ? 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: IIssue) => (i?.id === issue?.id ? issue : i)),
        },
      };
    }
    if (issueType === "ungrouped") {
      issues = issues as IIssueUnGroupedStructure;
      issues = issues.map((i: IIssue) => (i?.id === issue?.id ? issue : i));
    }

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

  fetchIssues = async (workspaceSlug: string, projectId: string) => {
    try {
      this.loader = true;
      this.error = null;

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

      // TODO: replace this once the issue filter is completed
      const params = { group_by: "state", order_by: "-created_at" };
      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 = false;
          this.error = null;
        });
      }

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

export default IssueStore;