import { Component, computed, input, output } from '@angular/core';
import { ButtonComponent } from '@shared/ui/atoms/button/button.component';
import { ChangeCounts, StamColumn, StamRow, StamTable, activeOn } from '@beheer/domain/stamdata';

interface DisplayRow {
  row: StamRow;
  index: number;
}

/**
 * Organism: the GENERIC stamdata grid. It renders entirely from the reflected column
 * schema — one input per column type (native `date`/`number`, `enum` select, text) — so a
 * new stamdata table needs zero UI code here. The "geldig op" control filters to the rows
 * valid on a date (read-only preview); edits and download work on the full set. Emits
 * intent; the store owns state (CLAUDE.md §1).
 */
@Component({
  selector: 'app-stamdata-table-editor',
  imports: [ButtonComponent],
  styles: [
    `
      :host {
        display: block;
      }
      .toolbar {
        display: flex;
        flex-wrap: wrap;
        gap: 1rem;
        align-items: end;
        margin-block-end: 1rem;
      }
      .field label {
        display: block;
        font-size: 0.85em;
        color: var(--rhc-color-foreground-subtle);
      }
      table {
        inline-size: 100%;
      }
      .err {
        color: var(--rhc-color-rood-500);
        font-size: 0.85em;
      }
      .footer {
        display: flex;
        flex-wrap: wrap;
        gap: 1rem;
        align-items: center;
        margin-block-start: 1rem;
      }
      .counts {
        color: var(--rhc-color-foreground-subtle);
      }
      .hint {
        margin-block-start: 0.5rem;
        color: var(--rhc-color-foreground-subtle);
        font-size: 0.9em;
      }
    `,
  ],
  template: `
    <div class="toolbar">
      @if (tables().length > 1) {
        <div class="field">
          <label for="stamdata-table">{{ tableLabel }}</label>
          <select
            id="stamdata-table"
            class="form-select"
            [value]="selectedTableId()"
            (change)="selectTable.emit(asValue($event))"
          >
            @for (t of tables(); track t.id) {
              <option [value]="t.id">{{ t.label }}</option>
            }
          </select>
        </div>
      }

      @if (table().temporal) {
        <div class="field">
          <label for="stamdata-peildatum">{{ peildatumLabel }}</label>
          <input
            id="stamdata-peildatum"
            type="date"
            class="form-control"
            [value]="previewDate()"
            (input)="previewDateChanged.emit(asValue($event))"
          />
        </div>
        @if (previewing()) {
          <app-button variant="subtle" (click)="previewDateChanged.emit('')">{{
            showAll
          }}</app-button>
        }
      }
    </div>

    @if (previewing()) {
      <p class="hint">{{ previewNote }}</p>
    }

    <table class="table">
      <thead>
        <tr>
          @for (col of table().columns; track col.name) {
            <th scope="col">{{ col.name }}</th>
          }
          <th scope="col">{{ previewing() ? '' : actionsLabel }}</th>
        </tr>
      </thead>
      <tbody>
        @for (item of display(); track item.index) {
          <tr>
            @for (col of table().columns; track col.name) {
              <td>
                @if (col.type === 'enum') {
                  <select
                    class="form-select"
                    [value]="item.row[col.name]"
                    [disabled]="previewing()"
                    [attr.aria-label]="cellLabel(col, item.index)"
                    (change)="
                      cellEdited.emit({ row: item.index, column: col.name, value: asValue($event) })
                    "
                  >
                    <option value=""></option>
                    @for (opt of col.options; track opt) {
                      <option [value]="opt">{{ opt }}</option>
                    }
                  </select>
                } @else {
                  <input
                    class="form-control"
                    [type]="inputType(col)"
                    [value]="item.row[col.name]"
                    [class.is-invalid]="!!errors()[item.index]"
                    [disabled]="previewing()"
                    [attr.aria-label]="cellLabel(col, item.index)"
                    (input)="
                      cellEdited.emit({ row: item.index, column: col.name, value: asValue($event) })
                    "
                  />
                }
              </td>
            }
            <td>
              @if (!previewing()) {
                @if (table().temporal) {
                  <app-button variant="subtle" (click)="onExpire(item.index)">{{
                    expireLabel
                  }}</app-button>
                }
                <app-button
                  variant="subtle"
                  [attr.aria-label]="removeLabel"
                  (click)="onRemove(item.index)"
                  >{{ removeLabel }}</app-button
                >
              }
              @if (errors()[item.index]) {
                <span class="err">{{ errors()[item.index] }}</span>
              }
            </td>
          </tr>
        }
      </tbody>
    </table>

    @if (!previewing()) {
      <div class="footer">
        <app-button variant="subtle" [disabled]="!canUndo()" (click)="undo.emit()">{{
          undoLabel
        }}</app-button>
        <app-button variant="subtle" [disabled]="!canRedo()" (click)="redo.emit()">{{
          redoLabel
        }}</app-button>
        <app-button variant="secondary" (click)="rowAdded.emit()">{{ addRowLabel }}</app-button>
        <span class="counts">{{ countsLabel() }}</span>
        <app-button variant="primary" [disabled]="!canDownload()" (click)="download.emit()">{{
          downloadLabel
        }}</app-button>
      </div>
      <p class="hint">{{ applyHint }}</p>
    }
  `,
})
export class StamdataTableEditorComponent {
  table = input.required<StamTable>();
  rows = input.required<readonly StamRow[]>();
  errors = input.required<readonly string[]>();
  counts = input.required<ChangeCounts>();
  previewDate = input('');
  canDownload = input(false);
  canUndo = input(false);
  canRedo = input(false);
  tables = input<readonly StamTable[]>([]);
  selectedTableId = input<string | null>(null);

  selectTable = output<string>();
  cellEdited = output<{ row: number; column: string; value: string }>();
  rowAdded = output<void>();
  rowRemoved = output<number>();
  previewDateChanged = output<string>();
  download = output<void>();
  undo = output<void>();
  redo = output<void>();

  protected previewing = computed(() => this.previewDate() !== '');

  protected display = computed<DisplayRow[]>(() =>
    this.rows()
      .map((row, index) => ({ row, index }))
      .filter(({ row }) => !this.previewing() || activeOn(this.table(), row, this.previewDate())),
  );

  protected inputType(col: StamColumn): string {
    return col.type === 'date' ? 'date' : col.type === 'number' ? 'number' : 'text';
  }

  protected cellLabel(col: StamColumn, index: number): string {
    return `${col.name} — rij ${index + 1}`;
  }

  protected asValue(e: Event): string {
    return (e.target as HTMLInputElement | HTMLSelectElement).value;
  }

  private addedWord = $localize`:@@beheer.added:toegevoegd`;
  private editedWord = $localize`:@@beheer.edited:gewijzigd`;
  private removedWord = $localize`:@@beheer.removed:verwijderd`;
  protected countsLabel = computed(() => {
    const c = this.counts();
    return `${c.added} ${this.addedWord} · ${c.edited} ${this.editedWord} · ${c.removed} ${this.removedWord}`;
  });

  protected tableLabel = $localize`:@@beheer.table:Tabel`;
  protected peildatumLabel = $localize`:@@beheer.peildatum:Toon geldig op`;
  protected showAll = $localize`:@@beheer.showAll:Toon alles`;
  protected previewNote = $localize`:@@beheer.previewNote:Voorbeeld: alleen de rijen die op deze datum geldig zijn. Bewerken staat uit.`;
  protected actionsLabel = $localize`:@@beheer.actions:Acties`;
  protected removeLabel = $localize`:@@beheer.remove:Verwijderen`;
  protected expireLabel = $localize`:@@beheer.expire:Sluiten per vandaag`;
  private removeConfirm = $localize`:@@beheer.removeConfirm:Rij verwijderen? Als andere gegevens ernaar verwijzen, faalt de build-controle (CI). Bij een tabel met een geldigheidsperiode kunt u de rij beter sluiten (geldig tot) in plaats van verwijderen.`;

  /** Deletions can orphan a reference (the CI gate catches it); confirm first. */
  protected onRemove(index: number) {
    if (confirm(this.removeConfirm)) this.rowRemoved.emit(index);
  }

  /** Steer temporal tables toward expiring (close the validity per today) over hard delete —
      preserves history and can't orphan a reference that was valid earlier. */
  protected onExpire(index: number) {
    const col = this.table().columns.find((c) => /geldigtot/i.test(c.name));
    if (col) this.cellEdited.emit({ row: index, column: col.name, value: this.today });
  }
  private today = new Date().toISOString().slice(0, 10);
  protected undoLabel = $localize`:@@beheer.undo:Ongedaan maken`;
  protected redoLabel = $localize`:@@beheer.redo:Opnieuw uitvoeren`;
  protected addRowLabel = $localize`:@@beheer.addRow:Rij toevoegen`;
  protected downloadLabel = $localize`:@@beheer.download:Download JSON`;
  protected applyHint = $localize`:@@beheer.applyHint:Wijzigingen worden als JSON-bestand gedownload en via een pull request toegepast — de build (CI) controleert ze.`;
}