import type { GrpcEvent, GrpcRequest } from '@yaakapp-internal/models';
import classNames from 'classnames';
import { format } from 'date-fns';
import { useAtomValue, useSetAtom } from 'jotai';
import type { CSSProperties } from 'react';
import { useEffect, useMemo, useRef, useState } from 'react';
import {
  activeGrpcConnectionAtom,
  activeGrpcConnections,
  pinnedGrpcConnectionIdAtom,
  useGrpcEvents,
} from '../hooks/usePinnedGrpcConnection';
import { useStateWithDeps } from '../hooks/useStateWithDeps';
import { copyToClipboard } from '../lib/copy';
import { AutoScroller } from './core/AutoScroller';
import { Banner } from './core/Banner';
import { Button } from './core/Button';
import { Editor } from './core/Editor/LazyEditor';
import { HotKeyList } from './core/HotKeyList';
import { Icon } from './core/Icon';
import { IconButton } from './core/IconButton';
import { KeyValueRow, KeyValueRows } from './core/KeyValueRow';
import { LoadingIcon } from './core/LoadingIcon';
import { Separator } from './core/Separator';
import { SplitLayout } from './core/SplitLayout';
import { HStack, VStack } from './core/Stacks';
import { EmptyStateText } from './EmptyStateText';
import { ErrorBoundary } from './ErrorBoundary';
import { RecentGrpcConnectionsDropdown } from './RecentGrpcConnectionsDropdown';

interface Props {
  style?: CSSProperties;
  className?: string;
  activeRequest: GrpcRequest;
  methodType:
    | 'unary'
    | 'client_streaming'
    | 'server_streaming'
    | 'streaming'
    | 'no-schema'
    | 'no-method';
}

export function GrpcResponsePane({ style, methodType, activeRequest }: Props) {
  const [activeEventId, setActiveEventId] = useState<string | null>(null);
  const [showLarge, setShowLarge] = useStateWithDeps<boolean>(false, [activeRequest.id]);
  const [showingLarge, setShowingLarge] = useState<boolean>(false);
  const connections = useAtomValue(activeGrpcConnections);
  const activeConnection = useAtomValue(activeGrpcConnectionAtom);
  const events = useGrpcEvents(activeConnection?.id ?? null);
  const setPinnedGrpcConnectionId = useSetAtom(pinnedGrpcConnectionIdAtom);

  const activeEvent = useMemo(
    () => events.find((m) => m.id === activeEventId) ?? null,
    [activeEventId, events],
  );

  // Set active message to the first message received if unary
  useEffect(() => {
    if (events.length === 0 || activeEvent != null || methodType !== 'unary') {
      return;
    }
    setActiveEventId(events.find((m) => m.eventType === 'server_message')?.id ?? null);
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [events.length]);

  return (
    <SplitLayout
      layout="vertical"
      style={style}
      name="grpc_events"
      defaultRatio={0.4}
      minHeightPx={20}
      firstSlot={() =>
        activeConnection == null ? (
          <HotKeyList
            hotkeys={['request.send', 'model.create', 'sidebar.focus', 'url_bar.focus']}
          />
        ) : (
          <div className="w-full grid grid-rows-[auto_minmax(0,1fr)] grid-cols-1 items-center">
            <HStack className="pl-3 mb-1 font-mono text-sm text-text-subtle overflow-x-auto hide-scrollbars">
              <HStack space={2}>
                <span className="whitespace-nowrap">{events.length} Messages</span>
                {activeConnection.state !== 'closed' && (
                  <LoadingIcon size="sm" className="text-text-subtlest" />
                )}
              </HStack>
              <div className="ml-auto">
                <RecentGrpcConnectionsDropdown
                  connections={connections}
                  activeConnection={activeConnection}
                  onPinnedConnectionId={setPinnedGrpcConnectionId}
                />
              </div>
            </HStack>
            <ErrorBoundary name="GRPC Events">
              <AutoScroller
                data={events}
                header={
                  activeConnection.error && (
                    <Banner color="danger" className="m-3">
                      {activeConnection.error}
                    </Banner>
                  )
                }
                render={(event) => (
                  <EventRow
                    key={event.id}
                    event={event}
                    isActive={event.id === activeEventId}
                    onClick={() => {
                      if (event.id === activeEventId) setActiveEventId(null);
                      else setActiveEventId(event.id);
                    }}
                  />
                )}
              />
            </ErrorBoundary>
          </div>
        )
      }
      secondSlot={
        activeEvent != null && activeConnection != null
          ? () => (
              <div className="grid grid-rows-[auto_minmax(0,1fr)]">
                <div className="pb-3 px-2">
                  <Separator />
                </div>
                <div className="h-full pl-2 overflow-y-auto grid grid-rows-[auto_minmax(0,1fr)] ">
                  {activeEvent.eventType === 'client_message' ||
                  activeEvent.eventType === 'server_message' ? (
                    <>
                      <div className="mb-2 select-text cursor-text grid grid-cols-[minmax(0,1fr)_auto] items-center">
                        <div className="font-semibold">
                          Message {activeEvent.eventType === 'client_message' ? 'Sent' : 'Received'}
                        </div>
                        <IconButton
                          title="Copy message"
                          icon="copy"
                          size="xs"
                          onClick={() => copyToClipboard(activeEvent.content)}
                        />
                      </div>
                      {!showLarge && activeEvent.content.length > 1000 * 1000 ? (
                        <VStack space={2} className="italic text-text-subtlest">
                          Message previews larger than 1MB are hidden
                          <div>
                            <Button
                              onClick={() => {
                                setShowingLarge(true);
                                setTimeout(() => {
                                  setShowLarge(true);
                                  setShowingLarge(false);
                                }, 500);
                              }}
                              isLoading={showingLarge}
                              color="secondary"
                              variant="border"
                              size="xs"
                            >
                              Try Showing
                            </Button>
                          </div>
                        </VStack>
                      ) : (
                        <Editor
                          language="json"
                          defaultValue={activeEvent.content ?? ''}
                          wrapLines={false}
                          readOnly={true}
                          stateKey={null}
                        />
                      )}
                    </>
                  ) : (
                    <div className="h-full grid grid-rows-[auto_minmax(0,1fr)]">
                      <div>
                        <div className="select-text cursor-text font-semibold">
                          {activeEvent.content}
                        </div>
                        {activeEvent.error && (
                          <div className="select-text cursor-text text-sm font-mono py-1 text-warning">
                            {activeEvent.error}
                          </div>
                        )}
                      </div>
                      <div className="py-2 h-full">
                        {Object.keys(activeEvent.metadata).length === 0 ? (
                          <EmptyStateText>
                            No{' '}
                            {activeEvent.eventType === 'connection_end' ? 'trailers' : 'metadata'}
                          </EmptyStateText>
                        ) : (
                          <KeyValueRows>
                            {Object.entries(activeEvent.metadata).map(([key, value]) => (
                              <KeyValueRow key={key} label={key}>
                                {value}
                              </KeyValueRow>
                            ))}
                          </KeyValueRows>
                        )}
                      </div>
                    </div>
                  )}
                </div>
              </div>
            )
          : null
      }
    />
  );
}

function EventRow({
  onClick,
  isActive,
  event,
}: {
  onClick?: () => void;
  isActive?: boolean;
  event: GrpcEvent;
}) {
  const { eventType, status, createdAt, content, error } = event;
  const ref = useRef<HTMLDivElement>(null);

  return (
    <div className="px-1" ref={ref}>
      <button
        onClick={onClick}
        className={classNames(
          'w-full grid grid-cols-[auto_minmax(0,3fr)_auto] gap-2 items-center text-left',
          'px-1.5 h-xs font-mono cursor-default group focus:outline-none focus:text-text rounded',
          isActive && '!bg-surface-active !text-text',
          'text-text-subtle hover:text',
        )}
      >
        <Icon
          color={
            eventType === 'server_message'
              ? 'info'
              : eventType === 'client_message'
                ? 'primary'
                : eventType === 'error' || (status != null && status > 0)
                  ? 'danger'
                  : eventType === 'connection_end'
                    ? 'success'
                    : undefined
          }
          title={
            eventType === 'server_message'
              ? 'Server message'
              : eventType === 'client_message'
                ? 'Client message'
                : eventType === 'error' || (status != null && status > 0)
                  ? 'Error'
                  : eventType === 'connection_end'
                    ? 'Connection response'
                    : undefined
          }
          icon={
            eventType === 'server_message'
              ? 'arrow_big_down_dash'
              : eventType === 'client_message'
                ? 'arrow_big_up_dash'
                : eventType === 'error' || (status != null && status > 0)
                  ? 'alert_triangle'
                  : eventType === 'connection_end'
                    ? 'check'
                    : 'info'
          }
        />
        <div className={classNames('w-full truncate text-xs')}>
          {content.slice(0, 1000)}
          {error && <span className="text-warning"> ({error})</span>}
        </div>
        <div className={classNames('opacity-50 text-xs')}>
          {format(createdAt + 'Z', 'HH:mm:ss.SSS')}
        </div>
      </button>
    </div>
  );
}