import { useState } from 'react';
import { Building2, Mail, Phone, User, Pencil, Trash2, Check, X } from 'lucide-react';
import { useDavContacts, useSelectedCollection } from './useDavData';
import { useDavEdit, setProperty } from './useDavEdit';
import { useTranslation } from 'officerdev';

// Right panel of /contacts: the selected address book as cards, sorted by name.
//
// `hasPhoto` is a flag, not the bytes — the sidecar keeps embedded photos out of the list response so a
// book with a hundred cards is not a hundred base64 blobs. Until there is an endpoint that serves one
// card's photo, an initial stands in.

const initials = (name: string) =>
  name
    .split(/\s+/)
    .filter(Boolean)
    .slice(0, 2)
    .map((part) => part[0]?.toUpperCase() ?? '')
    .join('') || '?';

export const ContactsView = () => {
  const { t } = useTranslation();
  const { selected, isLoading: loadingCollections } = useSelectedCollection('addressbook');
  const { contacts, isLoading, error } = useDavContacts(selected?.path ?? null);
  const edit = useDavEdit(['caldav', 'contacts', selected?.path ?? null]);
  const [editing, setEditing] = useState<string | null>(null);
  const [draft, setDraft] = useState({ fullName: '', email: '', phone: '' });
  const [confirming, setConfirming] = useState<string | null>(null);

  if (loadingCollections) return <Placeholder text="Loading address books…" />;
  if (!selected) return <Placeholder text="No address books yet. Create one from a CardDAV client." />;
  if (error) return <Placeholder text={t('dav.readFailed', { name: selected.displayName, reason: String(error) })} />;
  if (isLoading) return <Placeholder text="Loading contacts…" />;
  if (contacts.length === 0) return <Placeholder text={`${selected.displayName} has no contacts.`} />;

  const sorted = [...contacts].sort((a, b) => a.fullName.localeCompare(b.fullName));

  return (
    <div className="h-full overflow-y-auto">
      <div className="mx-auto grid max-w-4xl grid-cols-1 gap-3 p-6 sm:grid-cols-2">
        {sorted.map((contact) => (
          <article key={contact.uid} className="flex gap-3 rounded-xl border bg-card p-3">
            <div className="flex h-10 w-10 shrink-0 items-center justify-center rounded-full bg-sky-500/15 text-sm font-semibold text-sky-600">
              {initials(contact.fullName)}
            </div>
            <div className="min-w-0 flex-1">
              <div className="truncate text-sm font-medium">{contact.fullName || '(no name)'}</div>
              {(contact.title || contact.org) && (
                <div className="mt-0.5 flex items-center gap-1 text-xs text-muted-foreground">
                  <Building2 className="h-3 w-3 shrink-0" />
                  <span className="truncate">{[contact.title, contact.org].filter(Boolean).join(' · ')}</span>
                </div>
              )}
              {contact.emails.map((email) => (
                <a
                  key={email}
                  href={`mailto:${email}`}
                  className="mt-1 flex items-center gap-1 text-xs text-muted-foreground hover:text-foreground"
                >
                  <Mail className="h-3 w-3 shrink-0" />
                  <span className="truncate">{email}</span>
                </a>
              ))}
              {contact.phones.map((phone) => (
                <a
                  key={phone}
                  href={`tel:${phone}`}
                  className="mt-1 flex items-center gap-1 text-xs tabular-nums text-muted-foreground hover:text-foreground"
                >
                  <Phone className="h-3 w-3 shrink-0" />
                  <span className="truncate">{phone}</span>
                </a>
              ))}

              {/* Name, one email, one phone — the three fields worth correcting from a list. A card can
                  hold several of each; editing rewrites the FIRST and leaves the rest untouched, which
                  is why `setProperty` replaces a line rather than rebuilding the card. */}
              {editing === contact.href && (
                <form
                  className="mt-2 flex flex-col gap-2"
                  onSubmit={(e) => {
                    e.preventDefault();
                    if (!contact.href) return;
                    void edit
                      .save(contact.href, (raw) => {
                        let out = setProperty(raw, 'FN', draft.fullName);
                        out = setProperty(out, 'EMAIL', draft.email || null);
                        return setProperty(out, 'TEL', draft.phone || null);
                      })
                      .then(() => setEditing(null));
                  }}
                >
                  <input
                    autoFocus
                    value={draft.fullName}
                    onChange={(e) => setDraft((d) => ({ ...d, fullName: e.target.value }))}
                    placeholder="Name"
                    className="rounded-md border bg-background px-2 py-1 text-sm"
                  />
                  <input
                    value={draft.email}
                    onChange={(e) => setDraft((d) => ({ ...d, email: e.target.value }))}
                    placeholder="Email"
                    className="rounded-md border bg-background px-2 py-1 text-xs"
                  />
                  <input
                    value={draft.phone}
                    onChange={(e) => setDraft((d) => ({ ...d, phone: e.target.value }))}
                    placeholder="Phone"
                    className="rounded-md border bg-background px-2 py-1 text-xs tabular-nums"
                  />
                  <div className="flex items-center gap-2">
                    <button
                      type="submit"
                      disabled={edit.busy === contact.href}
                      className="flex items-center gap-1 rounded-md bg-primary/10 px-2 py-1 text-xs text-primary disabled:opacity-50"
                    >
                      <Check className="h-3 w-3" /> {edit.busy === contact.href ? 'Saving…' : 'Save'}
                    </button>
                    <button
                      type="button"
                      onClick={() => setEditing(null)}
                      className="rounded-md px-2 py-1 text-xs text-muted-foreground"
                    >
                      Cancel
                    </button>
                  </div>
                </form>
              )}
            </div>

            {contact.href && editing !== contact.href && (
              <div className="flex shrink-0 items-start gap-1">
                {confirming === contact.href ? (
                  <>
                    <button
                      onClick={() => void edit.remove(contact.href!).then(() => setConfirming(null))}
                      disabled={edit.busy === contact.href}
                      title="Delete this contact"
                      className="rounded p-1 text-destructive hover:bg-destructive/10 disabled:opacity-50"
                    >
                      <Check className="h-3.5 w-3.5" />
                    </button>
                    <button onClick={() => setConfirming(null)} className="rounded p-1 opacity-50 hover:opacity-100">
                      <X className="h-3.5 w-3.5" />
                    </button>
                  </>
                ) : (
                  <>
                    <button
                      onClick={() => {
                        setDraft({
                          fullName: contact.fullName ?? '',
                          email: contact.emails[0] ?? '',
                          phone: contact.phones[0] ?? '',
                        });
                        setEditing(contact.href!);
                      }}
                      title="Edit"
                      className="rounded p-1 text-muted-foreground hover:text-foreground"
                    >
                      <Pencil className="h-3.5 w-3.5" />
                    </button>
                    <button
                      onClick={() => setConfirming(contact.href!)}
                      title="Delete"
                      className="rounded p-1 text-muted-foreground hover:text-destructive"
                    >
                      <Trash2 className="h-3.5 w-3.5" />
                    </button>
                  </>
                )}
              </div>
            )}
          </article>
        ))}
      </div>
    </div>
  );
};

const Placeholder = ({ text }: { text: string }) => (
  <div className="flex h-full flex-col items-center justify-center gap-2 p-6 text-center text-sm text-muted-foreground">
    <User className="h-6 w-6 opacity-40" />
    <span>{text}</span>
  </div>
);