import { Component, computed, effect, inject } from '@angular/core';
import { PageShellComponent } from '@shared/layout/page-shell/page-shell.component';
import { AlertComponent } from '@shared/ui/alert/alert.component';
import { ButtonComponent } from '@shared/ui/button/button.component';
import { ASYNC } from '@shared/ui/async/async.component';
import { AccessStore } from '@shared/application/access.store';
import { OrgTemplateStore } from '@brief/application/org-template.store';
import { OrgTemplateEditorComponent } from '@brief/ui/org-template-editor/org-template-editor.component';

/** Page: thin container for the admin org-template editor. Deny-by-default
    capability gate (`orgtemplate:edit`) — a denial alert for non-admins, the editor
    for admins. Loads once the capability resolves; wires store commands to the organism. */
@Component({
  selector: 'app-org-template-page',
  imports: [
    PageShellComponent,
    AlertComponent,
    ButtonComponent,
    ...ASYNC,
    OrgTemplateEditorComponent,
  ],
  styles: [
    `
      .save {
        color: var(--rhc-color-foreground-subtle);
        font-size: 0.9em;
      }
    `,
  ],
  template: `
    <app-page-shell [heading]="heading" [intro]="intro" backLink="/brief">
      @if (store.lastError(); as err) {
        <app-alert type="error">{{ err }}</app-alert>
      }

      @if (!access.ready()) {
        <!-- wait for /me before deciding — avoids flashing the denial to an admin -->
      } @else if (!canEdit()) {
        <app-alert type="error">{{ deniedText }}</app-alert>
      } @else {
        <app-async [data]="store.remoteData()">
          <ng-template appAsyncError>
            <app-alert type="error">{{ failedText }}</app-alert>
            <app-button variant="secondary" (click)="reload()">{{ retryText }}</app-button>
          </ng-template>
          <ng-template appAsyncLoaded>
            @if (store.draft(); as draft) {
              <app-org-template-editor
                [draft]="draft"
                [logoUrl]="store.logoUrl()"
                [uploadState]="store.uploadState()"
                [subOrgs]="store.subOrgs()"
                [selectedSubOrgId]="store.selectedSubOrgId()"
                [history]="store.history()"
                [publishedVersion]="store.publishedVersion()"
                [unsentBriefs]="store.unsentBriefs()"
                [draftValid]="store.draftValid()"
                [busy]="store.busy()"
                [pendingPublish]="store.pendingPublish()"
                [saveText]="saveText()"
                [previewUrlFor]="previewUrlFor"
                (selectSubOrg)="store.selectSubOrg($event)"
                (templateEdit)="
                  store.edit({ tag: 'FieldEdited', field: $event.field, value: $event.value })
                "
                (marginEdit)="
                  store.edit({ tag: 'MarginEdited', edge: $event.edge, value: $event.value })
                "
                (logoSelected)="store.onLogoSelected($event)"
                (logoRemoved)="store.onLogoRemoved($event)"
                (logoRetry)="store.onLogoRetry($event)"
                (requestPublish)="store.requestPublish()"
                (confirmPublish)="store.confirmPublish()"
                (cancelPublish)="store.cancelPublish()"
                (rollback)="store.rollback($event)"
                (proefbrief)="store.proefbrief()"
              />
            }
          </ng-template>
        </app-async>
      }
    </app-page-shell>
  `,
})
export class OrgTemplatePage {
  protected store = inject(OrgTemplateStore);
  protected access = inject(AccessStore);

  protected canEdit = computed(() => this.access.can('orgtemplate:edit'));
  protected previewUrlFor = this.store.previewUrlFor;

  protected heading = $localize`:@@orgTemplate.page.heading:Huisstijl beheren`;
  protected intro = $localize`:@@orgTemplate.page.intro:Beheer per organisatieonderdeel het uiterlijk van de brief: logo, afzender, ondertekening, voettekst en marges.`;
  protected deniedText = $localize`:@@orgTemplate.page.denied:U hebt geen rechten om organisatiesjablonen te beheren.`;
  protected failedText = $localize`:@@orgTemplate.page.failed:Het sjabloon kon niet worden geladen.`;
  protected retryText = $localize`:@@orgTemplate.page.retry:Opnieuw proberen`;

  private savingText = $localize`:@@orgTemplate.page.saving:Concept opslaan…`;
  private savedText = $localize`:@@orgTemplate.page.saved:Concept opgeslagen`;
  private saveErrorText = $localize`:@@orgTemplate.page.saveError:Opslaan mislukt`;
  protected saveText = computed(() => {
    switch (this.store.saveState().tag) {
      case 'Saving':
        return this.savingText;
      case 'Saved':
        return this.savedText;
      case 'Error':
        return this.saveErrorText;
      default:
        return '';
    }
  });

  private loadRequested = false;
  constructor() {
    // Load once the capability resolves to `allowed` (a 403 GET would be wasted
    // otherwise). Depends only on `canEdit()` + a plain flag — never on the store
    // model, so dispatching `Loading` inside `load()` can't retrigger this effect.
    effect(() => {
      if (this.canEdit() && !this.loadRequested) {
        this.loadRequested = true;
        void this.store.load();
      }
    });
  }

  protected reload() {
    void this.store.load();
  }
}