import { Link, useSearchParams } from 'react-router-dom';
import { useEffect, useRef, useState } from 'react';
import { BrandMark } from '../../../shared/components/BrandMark';
import { useViewport } from '../../../shared/hooks/useViewport';
import { ChatConversationList } from '../components/ChatConversationList';
import { ChatTransferPanel } from '../components/ChatTransferPanel';
import { ContactProfilePanel } from '../components/ContactProfilePanel';
import { ChatWindow } from '../components/ChatWindow';
import { useChat } from '../hooks/useChat';
import { quickReplies } from '../services/chatMocks';

export function ChatPage() {
  const [searchParams, setSearchParams] = useSearchParams();
  const { isWideDesktop, isDesktop, isTablet, isMobile } = useViewport();
  const {
    currentUserId,
    contacts,
    activeContact,
    activeContactId,
    setActiveContactId,
    messages,
    draft,
    setDraft,
    attachedFile,
    attachFile,
    removeAttachedFile,
    sendMessage,
    hydrateMessageMedia,
    assumeChat,
    releaseChat,
    closeChat,
    canAssumeChat,
    canReply,
    assignmentLabel,
    transferNoteLabel,
    updateContactProfile,
    isReplying,
    selectedArea,
    setSelectedArea,
    isTransferOpen,
    setIsTransferOpen,
    transferArea,
    setTransferArea,
    transferAreas,
    attendants,
    isSameUserArea,
    transferAttendant,
    setTransferAttendant,
    transferNote,
    setTransferNote,
    submitTransfer,
    isPaused,
    pauseDurationLabel,
  } = useChat();
  const requestedChatId = searchParams.get('chatId');
  const handledRequestedChatIdRef = useRef('');
  const [isContactPanelOpen, setIsContactPanelOpen] = useState(false);

  useEffect(() => {
    if (!requestedChatId) return;
    if (handledRequestedChatIdRef.current === requestedChatId) return;
    if (!contacts.some((contact) => contact.id === requestedChatId)) return;
    handledRequestedChatIdRef.current = requestedChatId;
    setActiveContactId(requestedChatId);
    setSearchParams({}, { replace: true });
  }, [requestedChatId, contacts, setActiveContactId, setSearchParams]);

  function selectContact(contactId) {
    setActiveContactId(contactId);
    if (requestedChatId) {
      setSearchParams({}, { replace: true });
    }
  }

  const gridTemplateColumns = isMobile
    ? '1fr'
    : isWideDesktop
      ? 'minmax(260px, 320px) minmax(0, 1.6fr) minmax(280px, 320px)'
      : isDesktop || isTablet
        ? 'minmax(260px, 320px) minmax(0, 1fr)'
        : '1fr';

  return (
    <main style={{ minHeight: '100vh', padding: '1.5rem' }}>
      <section
        style={{
          width: 'min(1680px, calc(100vw - 3rem))',
          margin: '0 auto',
          background: 'var(--color-surface-strong)',
          borderRadius: '32px',
          boxShadow: 'var(--shadow-lg)',
          padding: '1.5rem',
          display: 'grid',
          gap: '1.25rem',
        }}
      >
        <header
          style={{
            display: 'grid',
            gridTemplateColumns: isMobile ? '1fr' : 'auto 1fr auto',
            gap: '1rem',
            alignItems: 'center',
          }}
        >
          <BrandMark />
          <div
            style={{
              justifySelf: isMobile ? 'stretch' : 'center',
              padding: '0.85rem 1rem',
              borderRadius: '18px',
              background: 'rgba(0, 49, 80, 0.06)',
              color: 'var(--color-primary)',
              fontWeight: 700,
              textAlign: 'center',
            }}
          >
            {isPaused ? `Pausado ha ${pauseDurationLabel}` : 'Atendimento em tempo real'}
          </div>
          <Link
            to="/home"
            style={{
              justifySelf: isMobile ? 'stretch' : 'end',
              borderRadius: '16px',
              padding: '0.85rem 1rem',
              background: 'var(--color-primary)',
              color: '#fff',
              fontWeight: 700,
              textAlign: 'center',
            }}
          >
            Voltar para home
          </Link>
        </header>

        <section
          style={{
            display: 'grid',
            gridTemplateColumns,
            gap: '1rem',
            alignItems: 'stretch',
          }}
        >
          <ChatConversationList
            contacts={contacts}
            activeContactId={activeContactId}
            onSelectContact={selectContact}
            onOpenContact={() => {
              setIsTransferOpen(false);
              setIsContactPanelOpen(true);
            }}
            currentUserId={currentUserId}
            isMobile={isMobile}
          />

          <div style={{ display: 'grid', gap: '1rem', minWidth: 0, alignContent: 'start' }}>
            <ChatWindow
              contact={activeContact}
              messages={messages}
              selectedArea={selectedArea}
              setSelectedArea={setSelectedArea}
              draft={draft}
              setDraft={setDraft}
              attachedFile={attachedFile}
              onAttachFile={attachFile}
              onRemoveAttachedFile={removeAttachedFile}
              onLoadMedia={hydrateMessageMedia}
              onSend={sendMessage}
              onToggleTransfer={() => {
                setIsContactPanelOpen(false);
                setIsTransferOpen((current) => !current);
              }}
              onAssumeChat={assumeChat}
              onReleaseChat={releaseChat}
              onCloseChat={closeChat}
              canAssumeChat={canAssumeChat}
              canReply={canReply}
              assignmentLabel={assignmentLabel}
              transferNote={transferNoteLabel}
              isReplying={isReplying}
              isPaused={isPaused}
              pauseDurationLabel={pauseDurationLabel}
              isMobile={isMobile}
            />

            <div
              style={{
                display: 'grid',
                gridTemplateColumns: 'repeat(auto-fit, minmax(220px, 1fr))',
                gap: '0.75rem',
              }}
            >
              {quickReplies.map((reply) => (
                <button
                  key={reply}
                  type="button"
                  onClick={() => setDraft(reply)}
                  disabled={isPaused}
                  style={{
                    border: '1px solid var(--color-border)',
                    borderRadius: '18px',
                    padding: '0.85rem 1rem',
                    background: '#fff',
                    color: 'var(--color-primary)',
                    fontWeight: 600,
                    textAlign: 'left',
                    opacity: isPaused ? 0.55 : 1,
                  }}
                >
                  {reply}
                </button>
              ))}
            </div>
          </div>

          {isWideDesktop ? (
            <>
              <ChatTransferPanel
                isOpen={isTransferOpen}
                transferArea={transferArea}
                setTransferArea={setTransferArea}
                transferAreas={transferAreas}
                attendants={attendants}
                isSameUserArea={isSameUserArea}
                transferAttendant={transferAttendant}
                setTransferAttendant={setTransferAttendant}
                transferNote={transferNote}
                setTransferNote={setTransferNote}
                onSubmit={submitTransfer}
                onClose={() => setIsTransferOpen(false)}
              />
              <ContactProfilePanel
                isOpen={isContactPanelOpen}
                contact={activeContact}
                onClose={() => setIsContactPanelOpen(false)}
                onSaved={updateContactProfile}
              />
            </>
          ) : null}
        </section>

        {!isWideDesktop ? (
          <>
            <ChatTransferPanel
              isOpen={isTransferOpen}
              transferArea={transferArea}
              setTransferArea={setTransferArea}
              transferAreas={transferAreas}
              attendants={attendants}
              isSameUserArea={isSameUserArea}
              transferAttendant={transferAttendant}
              setTransferAttendant={setTransferAttendant}
              transferNote={transferNote}
              setTransferNote={setTransferNote}
              onSubmit={submitTransfer}
              onClose={() => setIsTransferOpen(false)}
            />
            <ContactProfilePanel
              isOpen={isContactPanelOpen}
              contact={activeContact}
              onClose={() => setIsContactPanelOpen(false)}
              onSaved={updateContactProfile}
            />
          </>
        ) : null}
      </section>
    </main>
  );
}