import { SchoolTransfer } from '../shared/school-transfer';
import { Component, computed, DestroyRef, effect, inject, OnInit, signal } from '@angular/core';
import { DatePipe } from '@angular/common';
import { takeUntilDestroyed } from '@angular/core/rxjs-interop';
import { ActivatedRoute, Router, RouterLink, RouterLinkActive } from '@angular/router';
import { catchError, EMPTY, firstValueFrom, switchMap } from 'rxjs';
import {
  DanceGroup,
  EditorTarget,
  GROUP_STYLES,
  GROUP_TYPES,
  ResourceKind,
  SchoolData,
  Show,
} from '../core/api-models';
import { apiError } from '../core/api-error';
import { SchedulingStatus } from '../core/scheduling-status';
import { SchoolApi } from '../core/school-api';
import { EntityEditor } from '../shared/entity-editor';
import { ConfirmDialog } from '../shared/confirm-dialog';
import { ScheduleEditor } from '../shared/schedule-editor';
import { CoachEditor } from '../shared/coach-editor';
import { GroupMembers } from '../shared/group-members';

interface DeleteTarget {
  kind: ResourceKind;
  id: number;
  name: string;
  explanation: string;
}

@Component({
  selector: 'app-school-page',
  imports: [
    ScheduleEditor,
    CoachEditor,
    SchoolTransfer,
    DatePipe,
    RouterLink,
    RouterLinkActive,
    EntityEditor,
    ConfirmDialog,
    GroupMembers,
  ],
  templateUrl: './school-page.html',
})
export class SchoolPage implements OnInit {
  private readonly api = inject(SchoolApi);
  private readonly route = inject(ActivatedRoute);
  private readonly router = inject(Router);
  private readonly destroyRef = inject(DestroyRef);
  readonly data = signal<SchoolData | null>(null);
  readonly section = signal('overview');
  readonly loading = signal(true);
  readonly error = signal('');
  readonly notice = signal('');
  readonly editor = signal<EditorTarget | null>(null);
  readonly scheduleEditing = signal<Show | null>(null);
  readonly members = signal<DanceGroup | null>(null);
  readonly deleting = signal<DeleteTarget | null>(null);
  readonly schedulingStatus = inject(SchedulingStatus);
  private readonly starting = signal<number[]>([]);
  readonly scheduling = computed(() => [
    ...this.starting(),
    ...this.schedulingStatus
      .runs()
      .filter((run) => run.schoolId === this.data()?.school.id && run.state === 'RUNNING')
      .map((run) => run.showId),
  ]);
  private readonly completed = new Set<string>();

  constructor() {
    effect(() => {
      const schoolId = this.data()?.school.id;
      let changed = false;
      for (const run of this.schedulingStatus.runs()) {
        if (run.schoolId !== schoolId || run.state === 'RUNNING' || this.completed.has(run.runId))
          continue;
        this.completed.add(run.runId);
        changed = true;
      }
      if (changed) void this.reload();
    });
  }
  readonly deleteBusy = signal(false);
  readonly deleteError = signal('');
  readonly search = signal('');
  readonly dancers = computed(() =>
    [...(this.data()?.dancers ?? [])]
      .filter((d) => d.name.toLocaleLowerCase('nl').includes(this.search().toLocaleLowerCase('nl')))
      .sort((a, b) => a.name.localeCompare(b.name, 'nl')),
  );
  readonly shows = computed(() =>
    [...(this.data()?.shows ?? [])].sort((a, b) =>
      this.firstDate(a).localeCompare(this.firstDate(b)),
    ),
  );
  readonly today = new Date().toLocaleDateString('en-CA');
  readonly upcoming = computed(() =>
    this.shows().find((show) => this.lastDate(show) >= this.today),
  );
  readonly tabs = [
    { value: 'overview', label: 'Overzicht' },
    { value: 'dancers', label: 'Dansers' },
    { value: 'groups', label: 'Dansgroepen' },
    { value: 'shows', label: 'Shows' },
  ];

  ngOnInit(): void {
    this.route.paramMap
      .pipe(
        switchMap((params) => {
          this.loading.set(true);
          this.error.set('');
          this.search.set('');
          this.editor.set(null);
          this.members.set(null);
          this.scheduleEditing.set(null);
          this.deleting.set(null);
          this.section.set(params.get('section') ?? 'overview');
          return this.api.schoolData(Number(params.get('schoolId'))).pipe(
            catchError((error) => {
              this.data.set(null);
              this.error.set(apiError(error));
              this.loading.set(false);
              return EMPTY;
            }),
          );
        }),
        takeUntilDestroyed(this.destroyRef),
      )
      .subscribe((data) => {
        this.data.set(data);
        this.loading.set(false);
      });
  }
  firstDate(show: Show): string {
    return show.dayParts.map((p) => p.date).sort()[0] ?? '';
  }
  lastDate(show: Show): string {
    return (
      show.dayParts
        .map((p) => p.date)
        .sort()
        .at(-1) ?? ''
    );
  }
  dateRange(show: Show): string {
    const first = this.firstDate(show),
      last = this.lastDate(show);
    return !first ? 'No dates configured' : first === last ? first : `${first} – ${last}`;
  }
  scheduleValid(show: Show): boolean {
    return show.violations?.length === 0;
  }

  groupNamesFor(ids: number[]): string {
    return (
      ids.map((id) => this.data()?.groups.find((g) => g.id === id)?.category ?? '?').join(', ') ||
      'Geen groepen'
    );
  }
  async schedule(show: Show): Promise<void> {
    const schoolId = this.data()?.school.id;
    if (
      schoolId === undefined ||
      this.scheduling().includes(show.id) ||
      !show.dayParts.length ||
      !this.data()?.groups.length
    )
      return;
    if (
      !window.confirm(
        `Groepen inplannen voor ${show.name}? Dit vervangt alle huidige toewijzingen.`,
      )
    )
      return;
    this.starting.update((ids) => [...ids, show.id]);
    this.error.set('');
    try {
      const result = await firstValueFrom(this.api.schedule(schoolId, show.id));
      this.schedulingStatus.started(result);
    } catch (error: unknown) {
      this.error.set(apiError(error));
    } finally {
      this.starting.update((ids) => ids.filter((id) => id !== show.id));
    }
  }
  async reload(): Promise<void> {
    const id = this.data()?.school.id;
    if (id === undefined) return;
    this.error.set('');
    try {
      const data = await firstValueFrom(this.api.schoolData(id));
      if (this.data()?.school.id === id) this.data.set(data);
    } catch (error: unknown) {
      this.error.set(apiError(error));
    }
  }
  retry(): void {
    window.location.reload();
  }
  async saved(): Promise<void> {
    this.editor.set(null);
    this.notice.set('Wijzigingen opgeslagen.');
    await this.reload();
  }
  groupType(value: string): string {
    return GROUP_TYPES.find((option) => option.value === value)?.label ?? value;
  }
  groupStyle(value: string): string {
    return GROUP_STYLES.find((option) => option.value === value)?.label ?? value;
  }
  groupNames(dancerId: number): string {
    return (
      this.data()
        ?.groups.filter((group) => group.dancerIds.includes(dancerId))
        .map((group) => group.category)
        .join(', ') || 'Nog geen groep'
    );
  }
  private deletionRevision?: number;

  askDelete(target: DeleteTarget): void {
    this.deletionRevision = this.data()?.school.revision;
    this.deleteError.set('');
    if (target.kind === 'group') {
      const names =
        this.data()
          ?.shows.filter((s) => s.dayParts.some((p) => p.danceGroupIds.length))
          .map((s) => s.name) ?? [];
      if (names.length)
        target = {
          ...target,
          explanation: `${target.explanation} De planning kan ongeldig worden van: ${names.join(', ')}.`,
        };
    }
    this.deleting.set(target);
  }
  membershipChanged(ids: number[]): void {
    void this.reload();
    const groupId = this.members()?.id;
    this.data.update((data) =>
      data
        ? {
            ...data,
            groups: data.groups.map((group) =>
              group.id === groupId ? { ...group, dancerIds: [...ids] } : group,
            ),
          }
        : data,
    );
  }
  async confirmDelete(): Promise<void> {
    const target = this.deleting();
    const schoolId = this.data()?.school.id;
    if (!target || schoolId === undefined || this.deleteBusy()) return;
    this.deleteBusy.set(true);
    this.deleteError.set('');
    try {
      await firstValueFrom(
        this.api.delete(target.kind, schoolId, target.id, this.deletionRevision),
      );
      this.deleting.set(null);
      if (target.kind === 'school') await this.router.navigate(['/schools']);
      else {
        this.notice.set(`${target.name} is verwijderd.`);
        await this.reload();
      }
    } catch (error: unknown) {
      this.deleteError.set(apiError(error));
    } finally {
      this.deleteBusy.set(false);
    }
  }
}