import { Component, ElementRef, computed, input, output, viewChild } from '@angular/core';
import { PlaceholderOption } from '@shared/ui/rich-text-editor/rich-text-editor.component';
import { ButtonComponent } from '@shared/ui/button/button.component';
import { HeadingComponent } from '@shared/ui/heading/heading.component';
import { StepperComponent } from '@shared/ui/stepper/stepper.component';
import { Besluit, Brief, CaseContext, LibraryPassage } from '@brief/domain/brief';
import { inferSelection } from '@brief/domain/besluit';
import { Diagnostic } from '@brief/domain/placeholders';
import { OrgTemplate } from '@brief/domain/org-template';
import { BriefMsg } from '@brief/domain/brief.machine';
import { LetterCanvasComponent } from '@brief/ui/letter-canvas/letter-canvas.component';
import { DiagnosticsPanelComponent } from '@brief/ui/diagnostics-panel/diagnostics-panel.component';
import { RejectionCommentsComponent } from '@brief/ui/rejection-comments/rejection-comments.component';
import { LetterEditorComponent } from '@brief/ui/letter-editor/letter-editor.component';
import { BesluitPanelComponent } from '@brief/ui/besluit-panel/besluit-panel.component';

/** Organism: the behandelaar's drafting step. Frames "Brief opstellen" as one step in
    the case workflow — a case-context header + stepper (Beoordelen → Brief opstellen →
    Indienen, neighbours stubbed) — with the besluit-driven guidance, the lean letter
    editor, and an on-demand full-letter preview in a modal. Only ever renders for an
    editable brief (draft/rejected); the approver's read-only flow stays in
    letter-composer. Presentational: emits edit/submit/preview intents. */
@Component({
  selector: 'app-behandel-scherm',
  imports: [
    ButtonComponent,
    HeadingComponent,
    StepperComponent,
    LetterCanvasComponent,
    DiagnosticsPanelComponent,
    RejectionCommentsComponent,
    LetterEditorComponent,
    BesluitPanelComponent,
  ],
  styles: [
    `
      :host {
        display: block;
      }
      .case-head {
        margin-block-end: var(--rhc-space-max-lg);
        padding: var(--rhc-space-max-md) var(--rhc-space-max-lg);
        border-inline-start: 4px solid var(--rhc-color-primary, var(--rhc-color-border-strong));
        background: var(--rhc-color-background-subtle, transparent);
      }
      .case-meta {
        display: flex;
        flex-wrap: wrap;
        gap: var(--rhc-space-max-md);
        color: var(--rhc-color-foreground-subtle);
      }
      .step-body {
        display: grid;
        gap: var(--rhc-space-max-xl);
        margin-block-start: var(--rhc-space-max-lg);
      }
      .bar {
        display: flex;
        flex-wrap: wrap;
        gap: var(--rhc-space-max-md);
        align-items: center;
        margin-block-start: var(--rhc-space-max-xl);
      }
      dialog {
        border: none;
        border-radius: var(--rhc-radius-md, 4px);
        padding: 0;
        max-width: min(900px, 95vw);
        width: 100%;
      }
      dialog::backdrop {
        background: rgb(0 0 0 / 45%); /* token-ok: modal scrim, not a palette colour */
      }
      .modal-body {
        padding: var(--rhc-space-max-lg);
        max-height: 80vh;
        overflow: auto;
      }
      .modal-bar {
        display: flex;
        justify-content: space-between;
        gap: var(--rhc-space-max-md);
        padding: var(--rhc-space-max-md) var(--rhc-space-max-lg);
        border-block-start: 1px solid var(--rhc-color-border);
      }
    `,
  ],
  template: `
    <div class="case-head">
      <app-heading [level]="2">{{ caseHeading() }}</app-heading>
      <div class="case-meta">
        <span>{{ caseContext().aanvraagReferentie }}</span>
        <span>{{ caseContext().zorgverlenerNaam }}</span>
        <span>
          {{ bigLabel() }} {{ caseContext().bigNummer }}
          @if (canRevealBigNummer() && isMasked()) {
            <app-button variant="subtle" (click)="onReveal()">{{ revealLabel() }}</app-button>
          }
        </span>
        <span>{{ caseContext().beroep }}</span>
      </div>
    </div>

    <app-stepper
      [steps]="steps()"
      [current]="1"
      [processName]="processName()"
      [stepTitle]="stepTitle()"
    />

    <div class="step-body">
      @if (status() === 'rejected') {
        <app-rejection-comments mode="show" [comments]="rejectComments()" />
      }

      <app-besluit-panel
        [passages]="availablePassages()"
        [besluit]="selection().besluit"
        [initialRedenen]="selection().reasons"
        (selectionChange)="onSelection($event)"
      />

      <app-letter-editor [brief]="brief()" [placeholders]="menu()" (edit)="edit.emit($event)" />

      <app-diagnostics-panel [diagnostics]="diagnostics()" (locate)="locate.emit($event)" />

      <div class="bar">
        <app-button variant="subtle" (click)="openPreview()">{{ previewLabel() }}</app-button>
        <app-button variant="primary" [disabled]="!canSubmit() || busy()" (click)="submit.emit()">{{
          submitLabel()
        }}</app-button>
        @if (!canSubmit()) {
          <span class="app-text-subtle">{{ submitHint() }}</span>
        }
      </div>
    </div>

    <dialog #previewDialog>
      <div class="modal-body">
        <app-letter-canvas
          [brief]="brief()"
          [orgTemplate]="orgTemplate()"
          [logoUrl]="logoUrl()"
          [editableRegions]="'none'"
          [diagnostics]="diagnostics()"
        />
      </div>
      <div class="modal-bar">
        <app-button variant="secondary" (click)="preview.emit()">{{
          openDocumentLabel()
        }}</app-button>
        <app-button variant="primary" (click)="closePreview()">{{ closeLabel() }}</app-button>
      </div>
    </dialog>
  `,
})
export class BehandelSchermComponent {
  brief = input.required<Brief>();
  orgTemplate = input.required<OrgTemplate>();
  logoUrl = input<string | null>(null);
  availablePassages = input<readonly LibraryPassage[]>([]);
  diagnostics = input<readonly Diagnostic[]>([]);
  caseContext = input.required<CaseContext>();
  canSubmit = input(false);
  busy = input(false);
  /** Server decision (PRD-0002 §5c): may this actor unmask the case BIG-nummer? */
  canRevealBigNummer = input(false);

  edit = output<BriefMsg>();
  submit = output<void>();
  preview = output<void>();
  locate = output<Diagnostic>();
  revealBigNummer = output<void>();

  /** The BIG-nummer arrives masked (contains `*`); once revealed the swapped value has
      no `*`, so the reveal action hides itself — no separate "revealed" flag needed. */
  protected isMasked = computed(() => this.caseContext().bigNummer.includes('*'));

  /** Step-up (PRD-0002 §5d) stubbed as a native confirm — the extra verification gesture
      before an audited PII reveal. ponytail: real systems prompt MFA / recent re-auth. */
  protected onReveal() {
    if (confirm(this.stepUpPrompt())) this.revealBigNummer.emit();
  }

  private previewDialog = viewChild<ElementRef<HTMLDialogElement>>('previewDialog');

  protected status = computed(() => this.brief().status.tag);
  protected rejectComments = computed(() => {
    const s = this.brief().status;
    return s.tag === 'rejected' ? s.comments : '';
  });

  /** The besluit + redenen the letter currently reflects, read back off the kern's
      passages — this seeds the panel so it survives reload/undo (no separate storage). */
  protected selection = computed(() => {
    const kern = this.brief().sections.find((s) => s.sectionKey === 'kern');
    return inferSelection(kern?.blocks ?? [], this.availablePassages());
  });

  // Same insert menu as the composer: only valid, fillable, non-deprecated fields.
  protected menu = computed<PlaceholderOption[]>(() =>
    this.brief()
      .placeholders.filter((p) => p.fillable !== false && !p.deprecated)
      .map((p) => ({ key: p.key, label: p.label, autoResolvable: p.autoResolvable })),
  );

  /** Besluit/redenen changed → recompose the kern as one edit (= one undo step). */
  protected onSelection(sel: { besluit: Besluit | null; reasons: string[] }) {
    this.edit.emit({ tag: 'BesluitSelected', besluit: sel.besluit, reasons: sel.reasons });
  }

  protected openPreview() {
    this.previewDialog()?.nativeElement.showModal();
  }
  protected closePreview() {
    this.previewDialog()?.nativeElement.close();
  }

  protected submitLabel = computed(() =>
    this.status() === 'rejected'
      ? $localize`:@@brief.resubmit:Opnieuw indienen`
      : $localize`:@@brief.submit:Indienen ter beoordeling`,
  );

  protected steps = input<string[]>([
    $localize`:@@brief.step.beoordelen:Beoordelen`,
    $localize`:@@brief.step.opstellen:Brief opstellen`,
    $localize`:@@brief.step.indienen:Indienen`,
  ]);
  protected processName = input($localize`:@@brief.process:Herregistratie behandelen`);
  protected stepTitle = input($localize`:@@brief.step.opstellen:Brief opstellen`);
  protected caseHeading = input($localize`:@@brief.case.heading:Aanvraag herregistratie`);
  protected bigLabel = input($localize`:@@brief.case.big:BIG-nummer`);
  protected revealLabel = input($localize`:@@brief.case.reveal:Toon BIG-nummer`);
  protected stepUpPrompt = input(
    $localize`:@@brief.case.revealConfirm:Extra verificatie vereist. Het tonen van het BIG-nummer wordt vastgelegd. Doorgaan?`,
  );
  protected previewLabel = input($localize`:@@brief.preview.open:Voorbeeld`);
  protected openDocumentLabel = input(
    $localize`:@@brief.preview.openDocument:Openen als document (PDF)`,
  );
  protected closeLabel = input($localize`:@@common.close:Sluiten`);
  protected submitHint = input(
    $localize`:@@brief.submitHint:Vul eerst alle verplichte secties en los fouten op.`,
  );
}