import { Component, Injector, computed, inject, isDevMode, signal } from '@angular/core';
import { JsonPipe } from '@angular/common';
import { SessionStore } from '@auth/application/session.store';
import { Session } from '@auth/domain/session';
import { BigProfileStore } from '@registratie/application/big-profile.store';
import { map } from '@shared/application/remote-data';
import { Role } from '@shared/domain/role';
import { ROLES, currentRole, setRole } from '@shared/infrastructure/role';
import { Scenario, SCENARIOS, currentScenario, setScenario } from '@shared/infrastructure/scenario';
import { maskBsn, redactProfile } from './mask';

// CIBG-GAP EXTENSION: n/a — devtool, no corresponding CIBG concept; deliberately
// off-theme by design (see the ponytail note below), see cibg-gaps.mdx.
/**
 * Dev-only "show the current Model" panel (Elm-debugger style, read-only).
 * Observes the root singletons and renders them via the json pipe. Never a
 * product feature: the whole template is gated by isDevMode(), so it does not
 * render and is unreachable in a production build.
 *
 * ponytail: dev tool — intentionally off-theme (a dark code-editor look, not
 * CIBG). Its palette lives as --app-devpanel-* tokens in styles.scss so this file
 * stays hex-free (check:tokens has no holes), while still reading as a tool.
 */
@Component({
  selector: 'app-debug-state',
  imports: [JsonPipe],
  styles: [
    `
      .fab {
        position: fixed;
        bottom: 1rem;
        right: 1rem;
        z-index: 9999;
        font: 600 12px/1 monospace;
        background: var(--app-devpanel-bg);
        color: var(--app-devpanel-accent);
        border: var(--rhc-border-width-sm) solid var(--app-devpanel-border);
        border-radius: 4px;
        padding: 0.5rem 0.75rem;
        cursor: pointer;
      }
      .panel {
        position: fixed;
        bottom: 3.25rem;
        right: 1rem;
        z-index: 9999;
        width: min(90vw, 28rem);
        max-height: 70vh;
        overflow: auto;
        background: var(--app-devpanel-bg);
        color: var(--app-devpanel-fg);
        border: var(--rhc-border-width-sm) solid var(--app-devpanel-border);
        border-radius: 6px;
        box-shadow: 0 6px 24px var(--app-devpanel-shadow);
      }
      .panel pre {
        margin: 0;
        padding: 0.75rem;
        font: 12px/1.5 monospace;
        white-space: pre-wrap;
        word-break: break-word;
      }
      .switchers {
        display: flex;
        gap: 0.75rem;
        padding: 0.75rem;
        border-bottom: var(--rhc-border-width-sm) solid var(--app-devpanel-border);
      }
      .switchers label {
        display: flex;
        flex-direction: column;
        gap: 0.25rem;
        font: 11px/1.3 monospace;
        color: var(--app-devpanel-accent);
      }
      .switchers select {
        font: 12px/1 monospace;
        background: var(--app-devpanel-bg);
        color: var(--app-devpanel-fg);
        border: var(--rhc-border-width-sm) solid var(--app-devpanel-border);
        border-radius: 3px;
        padding: 0.25rem;
      }
    `,
  ],
  template: `
    @if (isDev) {
      <button type="button" class="fab" (click)="toggle()">
        {{ visible() ? '× state' : '⚙ state' }}
      </button>
      @if (visible()) {
        <div class="panel">
          <div class="switchers">
            <label
              >role
              <select [value]="role" (change)="switchRole($any($event.target).value)">
                @for (r of roles; track r) {
                  <option [value]="r">{{ r }}</option>
                }
              </select>
            </label>
            <label
              >scenario
              <select [value]="scenario" (change)="switchScenario($any($event.target).value)">
                @for (s of scenarios; track s) {
                  <option [value]="s">{{ s }}</option>
                }
              </select>
            </label>
          </div>
          <pre>{{ snapshot() | json }}</pre>
        </div>
      }
    }
  `,
})
export class DebugStateComponent {
  protected readonly isDev = isDevMode();
  protected readonly visible = signal(false);

  private session = inject(SessionStore);
  private injector = inject(Injector);
  // Resolved on first open only — BigProfileStore's httpResources fetch eagerly
  // on construction, so we must not instantiate it until the dev asks to look.
  private profileStore?: BigProfileStore;

  // PII is redacted/masked here (see mask.ts): the panel inspects state SHAPE,
  // never personal data — a deliberate habit for a PII-handling app.
  protected readonly snapshot = computed(() => ({
    session: maskSession(this.session.session()),
    profile: this.profileStore ? map(this.profileStore.profile(), redactProfile) : undefined,
    decisions: this.profileStore?.decisions(),
    aantekeningen: this.profileStore?.aantekeningen(),
    pendingHerregistratie: this.profileStore?.pendingHerregistratie(),
  }));

  // Dev switchers (WP-33): flip role/scenario without hand-editing the URL. Both are
  // read per-request in interceptors, so a reload re-runs them and re-fetches decisions.
  protected readonly roles = ROLES;
  protected readonly scenarios = SCENARIOS;
  protected readonly role = currentRole();
  protected readonly scenario = currentScenario();

  switchRole(r: Role): void {
    setRole(r);
    location.reload();
  }
  switchScenario(s: Scenario): void {
    setScenario(s);
    location.reload();
  }

  toggle(): void {
    if (!this.visible()) this.profileStore ??= this.injector.get(BigProfileStore);
    this.visible.update((v) => !v);
  }
}

function maskSession(s: Session | null): Session | null {
  return s ? { ...s, bsn: maskBsn(s.bsn) } : null;
}