import { Component, OnInit, signal } from "@angular/core";
import { RouterLink } from "@angular/router";
import { FormsModule } from "@angular/forms";
import { MATERIAL } from "../shared/material";
import { ApiService } from "../core/api.service";
import { Entry, Settings } from "../core/models";
@Component({
  standalone: true,
  imports: [RouterLink, FormsModule, ...MATERIAL],
  template: `<section class="page">
    <div class="page-head">
      <div>
        <h1>Kalender</h1>
        <p class="muted">{{ periodLabel() }}</p>
      </div>
      <div class="actions">
        <button mat-stroked-button [class.selected]="mode()==='month'" (click)="setMode('month')">Monat</button>
        <button mat-stroked-button [class.selected]="mode()==='week'" (click)="setMode('week')">Woche</button>
        <button mat-icon-button (click)="move(-1)">
          <mat-icon>chevron_left</mat-icon></button
        ><button mat-stroked-button (click)="today()">Heute</button
        ><button mat-icon-button (click)="move(1)">
          <mat-icon>chevron_right</mat-icon>
        </button>
      </div>
    </div>
    <mat-card class="calendar-filters"><mat-card-content>
      <mat-form-field appearance="outline"><mat-label>Ausbildung</mat-label><mat-select [(ngModel)]="typeFilter">
        <mat-option value="">Alle</mat-option>
        @for (type of types(); track type) { <mat-option [value]="type">{{ typeLabel(type) }}</mat-option> }
      </mat-select></mat-form-field>
      <mat-form-field appearance="outline"><mat-label>Art</mat-label><mat-select [(ngModel)]="artFilter">
        <mat-option value="">Alle</mat-option>
        @for (art of arts(); track art) { <mat-option [value]="art">{{ art }}</mat-option> }
      </mat-select></mat-form-field>
      <button mat-button (click)="clearFilters()">Zurücksetzen</button>
    </mat-card-content></mat-card>
    @if (loading()) {
      <mat-progress-bar mode="indeterminate" />
    }
    <mat-card class="calendar"
      ><div class="weekdays" aria-hidden="true">
        @for (d of weekdays; track d) {
          <strong>{{ d }}</strong>
        }
      </div>
      <div class="days">
        @for (day of days(); track day.key) {
          <div
            class="day"
            [class.outside]="!day.current"
            [class.today]="day.key === todayKey"
          >
            <div class="day-head">
              <span>{{ day.date.getDate() }}</span
              ><a
                mat-icon-button
                [routerLink]="['/entries/new']"
                [queryParams]="{ date: day.key }"
                ><mat-icon>add</mat-icon></a
              >
            </div>
            @for (e of forDay(day.key); track e.id) {
              <a class="event" [class]="'event ' + typeClass(e.praktikums_typ)" [routerLink]="['/entries', e.id, 'edit']" [attr.aria-label]="e.entry_art + ', ' + e.hours + ' Stunden ' + e.minutes + ' Minuten'"
                ><strong>{{ e.entry_art }}</strong
                ><span>{{ e.hours }}h {{ e.minutes }}min</span></a
              >
            }
          </div>
        }
      </div></mat-card
    >
  </section>`,
  styles: [
    `
      .calendar {
        overflow: hidden;
        min-width: 0;
      }
      .calendar-filters { margin-bottom:18px; }
      .calendar-filters mat-card-content { display:flex;align-items:center;gap:12px;flex-wrap:wrap;padding-bottom:0; }
      .calendar-filters mat-form-field { min-width:220px; }
      .selected { background:#dce9ff!important; }
      .weekdays,
      .days {
        display: grid;
        grid-template-columns: repeat(7, minmax(0, 1fr));
        min-width: 0;
      }
      .weekdays {
        padding: 14px;
        background: #edf2fb;
        text-align: center;
        color: #59657a;
      }
      .day {
        min-height: 145px;
        min-width: 0;
        padding: 8px;
        border-top: 1px solid #e1e6ef;
        border-right: 1px solid #e1e6ef;
        overflow: hidden;
      }
      .day-head {
        display: flex;
        justify-content: space-between;
        align-items: center;
      }
      .day-head a {
        transform: scale(0.8);
      }
      .outside {
        opacity: 0.42;
      }
      .today {
        background: #eef5ff;
      }
      .today .day-head > span {
        background: #155bd7;
        color: white;
        border-radius: 50%;
        width: 28px;
        height: 28px;
        display: grid;
        place-items: center;
      }
      :host-context(body.dark) .today {
        background: #202b3a;
        box-shadow: inset 0 0 0 2px #4f8ff7;
      }
      :host-context(body.dark) .today .day-head > span {
        background: #4f8ff7;
        color: #07111f;
        font-weight: 800;
      }
      :host-context(body.dark) .today .day-head a {
        color: #a9c9ff;
      }
      :host-context(body.dark) .today .event {
        color: #f7f9fc;
      }
      :host-context(body.dark) .today .event span {
        opacity: 0.82;
      }
      .event {
        display: flex;
        flex-direction: column;
        width: 100%;
        min-width: 0;
        max-width: 100%;
        overflow: hidden;
        text-decoration: none;
        color: inherit;
        background: #dce9ff;
        border-left: 3px solid #2868d8;
        border-radius: 6px;
        padding: 5px 7px;
        margin: 4px 0;
        font-size: 12px;
      }
      .event span {
        opacity: 0.75;
        margin-top: 2px;
      }
      .event strong,
      .event span {
        display: block;
        min-width: 0;
        overflow: hidden;
        white-space: nowrap;
        text-overflow: ellipsis;
      }
      .event.type-propaedeutikum { background:rgba(13,110,253,.14);border-left-color:#0d6efd; }
      .event.type-fachspezifikum { background:rgba(25,135,84,.14);border-left-color:#198754; }
      .event.type-mediation { background:rgba(253,126,20,.16);border-left-color:#fd7e14; }
      .event.type-psychotherapie { background:rgba(124,58,237,.14);border-left-color:#7c3aed; }
      .event.type-lsb { background:rgba(219,39,119,.14);border-left-color:#db2777; }
      .event.type-coaching { background:rgba(8,145,178,.14);border-left-color:#0891b2; }
      .event.type-supervision { background:rgba(202,138,4,.14);border-left-color:#ca8a04; }
      .event.type-sonstige { background:rgba(100,116,139,.14);border-left-color:#64748b; }
      @media (max-width: 700px) {
        .calendar-filters mat-card-content {
          gap: 8px;
          padding: 12px 12px 0;
        }
        .calendar-filters mat-form-field {
          width: 100%;
          min-width: 0;
        }
        .weekdays {
          padding: 9px 0;
        }
        .weekdays strong {
          font-size: 0;
        }
        .weekdays strong:first-letter {
          font-size: 13px;
        }
        .day {
          min-height: 92px;
          padding: 4px 3px;
        }
        .day-head a {
          width: 30px;
          height: 30px;
          padding: 3px;
          transform: none;
        }
        .day-head mat-icon {
          width: 20px;
          height: 20px;
          font-size: 20px;
          line-height: 20px;
        }
        .event {
          padding: 4px;
          border-left-width: 2px;
          font-size: 11px;
        }
        .event span {
          display: none;
        }
      }
      @media (max-width: 480px) {
        .weekdays strong:first-letter {
          font-size: 11px;
        }
        .day {
          min-height: 78px;
          padding: 3px 2px;
        }
        .day-head {
          font-size: 12px;
        }
        .day-head a {
          width: 24px;
          height: 24px;
          padding: 2px;
        }
        .day-head mat-icon {
          width: 18px;
          height: 18px;
          font-size: 18px;
          line-height: 18px;
        }
        .today .day-head > span {
          width: 24px;
          height: 24px;
        }
        .event {
          margin: 3px 0;
          padding: 3px 2px;
          border-radius: 4px;
          font-size: 10px;
        }
      }
    `,
  ],
})
export class CalendarComponent implements OnInit {
  readonly month = signal(
    new Date(new Date().getFullYear(), new Date().getMonth(), 1),
  );
  readonly weekAnchor = signal(new Date());
  readonly mode = signal<"month"|"week">("month");
  readonly entries = signal<Entry[]>([]);
  readonly loading = signal(false);
  readonly weekdays = ["Mo", "Di", "Mi", "Do", "Fr", "Sa", "So"];
  readonly types = signal<string[]>([]);
  readonly arts = signal<string[]>([]);
  readonly typeLabels = signal<Record<string,string>>({});
  typeFilter = "";
  artFilter = "";
  readonly todayKey = this.key(new Date());
  constructor(private api: ApiService) {}
  ngOnInit() {
    this.api.settings().subscribe((settings: Settings) => {
      this.types.set(settings.praktikums_typen);
      this.arts.set(settings.entry_arten);
      this.typeLabels.set(settings.praktikums_typ_labels);
    });
    this.load();
  }
  days() {
    if(this.mode()==="week"){
      const start=new Date(this.weekAnchor());
      start.setDate(start.getDate()-((start.getDay()+6)%7));
      return Array.from({length:7},(_,i)=>{const date=new Date(start);date.setDate(start.getDate()+i);return{date,key:this.key(date),current:true};});
    }
    const first = this.month(),
      start = new Date(first);
    const offset = (start.getDay() + 6) % 7;
    start.setDate(start.getDate() - offset);
    return Array.from({ length: 42 }, (_, i) => {
      const date = new Date(start);
      date.setDate(start.getDate() + i);
      return {
        date,
        key: this.key(date),
        current: date.getMonth() === first.getMonth(),
      };
    });
  }
  forDay(key: string) {
    return this.entries().filter((e) => e.date === key && (!this.typeFilter || e.praktikums_typ === this.typeFilter) && (!this.artFilter || e.entry_art === this.artFilter));
  }
  clearFilters(){this.typeFilter="";this.artFilter="";}
  typeLabel(type:string){return this.typeLabels()[type]||type.charAt(0).toUpperCase()+type.slice(1);}
  typeClass(value:string){
    const normalized=value?.toLocaleLowerCase("de-AT").normalize("NFD").replace(/[\u0300-\u036f]/g,"").replace(/[^a-z0-9]+/g,"-").replace(/^-|-$/g,"");
    return `type-${normalized === "propadeutikum" ? "propaedeutikum" : normalized || "unknown"}`;
  }
  move(n: number) {
    if(this.mode()==="week"){const d=new Date(this.weekAnchor());d.setDate(d.getDate()+n*7);this.weekAnchor.set(d);this.load();return;}
    const d = this.month();
    this.month.set(new Date(d.getFullYear(), d.getMonth() + n, 1));
    this.load();
  }
  today() {
    const d = new Date();
    this.month.set(new Date(d.getFullYear(), d.getMonth(), 1));
    this.weekAnchor.set(d);
    this.load();
  }
  setMode(mode:"month"|"week"){this.mode.set(mode);this.load();}
  periodLabel(){if(this.mode()==="month")return new Intl.DateTimeFormat("de-AT",{month:"long",year:"numeric"}).format(this.month());const ds=this.days();return `${new Intl.DateTimeFormat("de-AT",{day:"2-digit",month:"2-digit"}).format(ds[0].date)} – ${new Intl.DateTimeFormat("de-AT",{day:"2-digit",month:"2-digit",year:"numeric"}).format(ds[6].date)}`;}
  load() {
    const ds = this.days();
    this.loading.set(true);
    this.api.calendar(ds[0].key, ds[ds.length-1].key).subscribe({
      next: (e) => {
        this.entries.set(e);
        this.loading.set(false);
      },
      error: () => this.loading.set(false),
    });
  }
  private key(d: Date) {
    return `${d.getFullYear()}-${String(d.getMonth() + 1).padStart(2, "0")}-${String(d.getDate()).padStart(2, "0")}`;
  }
}