import { inject, Injectable } from '@angular/core';
import {
  BoardColumn,
  BoardFilter,
  BulkChange,
  BulkResult,
  ChangeStatusInput,
  CommandResult,
  CreateIssueInput,
  Epic,
  Issue,
  IssuePage,
  IssuesGateway,
  IssueSummary,
  LinkIssuesInput,
  MyIssuesFilter,
  UpdateIssueInput,
} from '@task-stream/web/tracker/domain';
import { map, Observable } from 'rxjs';
import {
  AddChecklistItemDocument,
  AssignIssueDocument,
  BacklogDocument,
  BulkUpdateIssuesDocument,
  BoardDocument,
  ChangeIssueStatusDocument,
  CreateIssueDocument,
  EpicsDocument,
  IssueChildrenDocument,
  IssueDocument,
  LinkIssuesDocument,
  MyIssuesDocument,
  RankIssueDocument,
  RemoveChecklistItemDocument,
  SearchIssuesDocument,
  SetIssueParentDocument,
  SetIssueReleaseDocument,
  UnlinkIssuesDocument,
  UnwatchIssueDocument,
  WatchIssueDocument,
  UpdateChecklistItemDocument,
  UpdateIssueDocument,
} from '../graphql/generated';
import { GraphqlOperations } from './graphql-operations';
import { toCommandResult, toIssue, toIssueSummary } from './mappers';

@Injectable()
export class GraphqlIssuesGateway extends IssuesGateway {
  private readonly gql = inject(GraphqlOperations);

  board(filter: BoardFilter): Observable<BoardColumn[]> {
    return this.gql
      .query(BoardDocument, {
        idOrKey: filter.projectId,
        releaseId: filter.releaseId ?? null,
        assigneeId: filter.assigneeId ?? null,
        area: filter.area ?? null,
        types: filter.types?.length ? filter.types : null,
        priorities: filter.priorities?.length
          ? (filter.priorities as never)
          : null,
        labels: filter.labels?.length ? filter.labels : null,
        search: filter.search?.trim() || null,
        unassigned: filter.unassigned ?? null,
        sprintId: filter.sprintId ?? null,
      })
      .pipe(
        map((d) =>
          d.project.board.map((column) => ({
            status: column.status,
            total: column.total,
            issues: column.issues.map(toIssueSummary),
          })),
        ),
      );
  }

  issue(idOrKey: string): Observable<Issue> {
    return this.gql
      .query(IssueDocument, { idOrKey })
      .pipe(map((d) => toIssue(d.issue)));
  }

  mine(filter: MyIssuesFilter): Observable<IssuePage> {
    return this.gql
      .query(MyIssuesDocument, {
        assignedToMe: filter.assignedToMe,
        categories: filter.categories as never,
        limit: filter.limit,
        search: filter.search?.trim() || null,
      })
      .pipe(
        map((d) => ({
          items: d.myIssues.items.map(toIssueSummary),
          total: d.myIssues.total,
        })),
      );
  }

  search(projectId: string, text: string): Observable<IssueSummary[]> {
    return this.gql
      .query(SearchIssuesDocument, { filter: { projectId, search: text } })
      .pipe(map((d) => d.issues.items.map(toIssueSummary)));
  }

  create(input: CreateIssueInput): Observable<CommandResult> {
    return this.gql
      .mutate(CreateIssueDocument, { input: input as never })
      .pipe(map((d) => toCommandResult(d.createIssue)));
  }

  update(input: UpdateIssueInput): Observable<CommandResult> {
    return this.gql
      .mutate(UpdateIssueDocument, { input: input as never })
      .pipe(map((d) => toCommandResult(d.updateIssue)));
  }

  changeStatus(input: ChangeStatusInput): Observable<CommandResult> {
    return this.gql
      .mutate(ChangeIssueStatusDocument, { input: input as never })
      .pipe(map((d) => toCommandResult(d.changeIssueStatus)));
  }

  assign(
    issueId: string,
    assigneeId: string | null,
  ): Observable<CommandResult> {
    return this.gql
      .mutate(AssignIssueDocument, { issueId, assigneeId })
      .pipe(map((d) => toCommandResult(d.assignIssue)));
  }

  link(input: LinkIssuesInput): Observable<CommandResult> {
    return this.gql
      .mutate(LinkIssuesDocument, { input: input as never })
      .pipe(map((d) => toCommandResult(d.linkIssues)));
  }

  unlink(input: LinkIssuesInput): Observable<CommandResult> {
    return this.gql
      .mutate(UnlinkIssuesDocument, { input: input as never })
      .pipe(map((d) => toCommandResult(d.unlinkIssues)));
  }

  watch(issueId: string, watching: boolean): Observable<CommandResult> {
    return watching
      ? this.gql
          .mutate(WatchIssueDocument, { issueId })
          .pipe(map((d) => toCommandResult(d.watchIssue)))
      : this.gql
          .mutate(UnwatchIssueDocument, { issueId })
          .pipe(map((d) => toCommandResult(d.unwatchIssue)));
  }

  children(projectId: string, issueId: string): Observable<IssueSummary[]> {
    return this.gql
      .query(IssueChildrenDocument, {
        filter: { projectId, parentId: issueId },
      })
      .pipe(map((d) => d.issues.items.map(toIssueSummary)));
  }

  setParent(
    issueId: string,
    parentId: string | null,
  ): Observable<CommandResult> {
    return this.gql
      .mutate(SetIssueParentDocument, { issueId, parentId })
      .pipe(map((d) => toCommandResult(d.setIssueParent)));
  }

  epics(projectId: string): Observable<Epic[]> {
    return this.gql.query(EpicsDocument, { projectId }).pipe(
      map((d) =>
        d.epics.map((epic) => ({
          issue: toIssueSummary(epic.issue),
          progress: { ...epic.progress },
        })),
      ),
    );
  }

  bulkUpdate(issueIds: string[], change: BulkChange): Observable<BulkResult> {
    return this.gql
      .mutate(BulkUpdateIssuesDocument, {
        input: {
          issueIds,
          status: change.status ?? null,
          unassign: change.assigneeId === null ? true : null,
          assigneeId: change.assigneeId ?? null,
          noSprint: change.sprintId === null ? true : null,
          sprintId: change.sprintId ?? null,
          priority: (change.priority ?? null) as never,
          addLabels: change.addLabels ?? null,
        },
      })
      .pipe(map((d) => d.bulkUpdateIssues));
  }

  backlog(projectId: string): Observable<IssuePage> {
    return this.gql
      .query(BacklogDocument, {
        filter: { projectId, categories: ['TODO'], sort: 'RANK' },
      })
      .pipe(
        map((d) => ({
          items: d.issues.items.map(toIssueSummary),
          total: d.issues.total,
        })),
      );
  }

  rank(
    issueId: string,
    aboveIssueId: string | null,
    belowIssueId: string | null,
  ): Observable<CommandResult> {
    return this.gql
      .mutate(RankIssueDocument, {
        input: { issueId, aboveIssueId, belowIssueId },
      })
      .pipe(map((d) => toCommandResult(d.rankIssue)));
  }

  addChecklistItem(issueId: string, text: string): Observable<CommandResult> {
    return this.gql
      .mutate(AddChecklistItemDocument, { input: { issueId, text } })
      .pipe(map((d) => toCommandResult(d.addChecklistItem)));
  }

  updateChecklistItem(
    issueId: string,
    itemId: string,
    changes: { text?: string; done?: boolean },
  ): Observable<CommandResult> {
    return this.gql
      .mutate(UpdateChecklistItemDocument, {
        input: { issueId, itemId, ...changes },
      })
      .pipe(map((d) => toCommandResult(d.updateChecklistItem)));
  }

  removeChecklistItem(
    issueId: string,
    itemId: string,
  ): Observable<CommandResult> {
    return this.gql
      .mutate(RemoveChecklistItemDocument, { issueId, itemId })
      .pipe(map((d) => toCommandResult(d.removeChecklistItem)));
  }

  setRelease(
    issueId: string,
    releaseId: string | null,
  ): Observable<CommandResult> {
    return this.gql
      .mutate(SetIssueReleaseDocument, { issueId, releaseId })
      .pipe(map((d) => toCommandResult(d.setIssueRelease)));
  }
}