import { easings } from '@react-spring/web';
import { useMemo, useCallback } from 'react';
import { EModelEndpoint } from 'librechat-data-provider';
import { useChatContext, useAgentsMapContext, useAssistantsMapContext } from '~/Providers';
import { useGetEndpointsQuery, useGetStartupConfig } from '~/data-provider';
import { BirthdayIcon, TooltipAnchor, SplitText } from '~/components';
import ConvoIcon from '~/components/Endpoints/ConvoIcon';
import { useLocalize, useAuthContext } from '~/hooks';
import { getIconEndpoint, getEntity } from '~/utils';

const containerClassName =
  'shadow-stroke relative flex h-full items-center justify-center rounded-full bg-white text-black';

export default function Landing({ centerFormOnLanding }: { centerFormOnLanding: boolean }) {
  const { conversation } = useChatContext();
  const agentsMap = useAgentsMapContext();
  const assistantMap = useAssistantsMapContext();
  const { data: startupConfig } = useGetStartupConfig();
  const { data: endpointsConfig } = useGetEndpointsQuery();
  const { user } = useAuthContext();
  const localize = useLocalize();

  const endpointType = useMemo(() => {
    let ep = conversation?.endpoint ?? '';
    if (
      [
        EModelEndpoint.chatGPTBrowser,
        EModelEndpoint.azureOpenAI,
        EModelEndpoint.gptPlugins,
      ].includes(ep as EModelEndpoint)
    ) {
      ep = EModelEndpoint.openAI;
    }
    return getIconEndpoint({
      endpointsConfig,
      iconURL: conversation?.iconURL,
      endpoint: ep,
    });
  }, [conversation?.endpoint, conversation?.iconURL, endpointsConfig]);

  const { entity, isAgent, isAssistant } = getEntity({
    endpoint: endpointType,
    agentsMap,
    assistantMap,
    agent_id: conversation?.agent_id,
    assistant_id: conversation?.assistant_id,
  });

  const name = entity?.name ?? '';
  const description = entity?.description ?? '';

  const getGreeting = useCallback(() => {
    if (typeof startupConfig?.interface?.customWelcome === 'string') {
      return startupConfig.interface.customWelcome;
    }

    const now = new Date();
    const hours = now.getHours();

    const dayOfWeek = now.getDay();
    const isWeekend = dayOfWeek === 0 || dayOfWeek === 6;

    // Early morning (midnight to 4:59 AM)
    if (hours >= 0 && hours < 5) {
      return localize('com_ui_late_night');
    }
    // Morning (6 AM to 11:59 AM)
    else if (hours < 12) {
      if (isWeekend) {
        return localize('com_ui_weekend_morning');
      }
      return localize('com_ui_good_morning');
    }
    // Afternoon (12 PM to 4:59 PM)
    else if (hours < 17) {
      return localize('com_ui_good_afternoon');
    }
    // Evening (5 PM to 8:59 PM)
    else {
      return localize('com_ui_good_evening');
    }
  }, [localize, startupConfig?.interface?.customWelcome]);

  return (
    <div
      className={`flex h-full transform-gpu flex-col items-center justify-center pb-16 transition-all duration-200 ${centerFormOnLanding ? 'max-h-full sm:max-h-0' : 'max-h-full'}`}
    >
      <div className="flex flex-col items-center gap-0 p-2">
        <div className="flex flex-col items-center justify-center gap-4 md:flex-row">
          <div className="relative size-10 justify-center">
            <ConvoIcon
              agentsMap={agentsMap}
              assistantMap={assistantMap}
              conversation={conversation}
              endpointsConfig={endpointsConfig}
              containerClassName={containerClassName}
              context="landing"
              className="h-2/3 w-2/3"
              size={41}
            />
            {startupConfig?.showBirthdayIcon && (
              <TooltipAnchor
                className="absolute bottom-[27px] right-2"
                description={localize('com_ui_happy_birthday')}
              >
                <BirthdayIcon />
              </TooltipAnchor>
            )}
          </div>
          {((isAgent || isAssistant) && name) || name ? (
            <div className="flex flex-col items-center gap-0 p-2">
              <SplitText
                key={`split-text-${name}`}
                text={name}
                className="text-4xl font-medium text-text-primary"
                delay={50}
                textAlign="center"
                animationFrom={{ opacity: 0, transform: 'translate3d(0,50px,0)' }}
                animationTo={{ opacity: 1, transform: 'translate3d(0,0,0)' }}
                easing={easings.easeOutCubic}
                threshold={0}
                rootMargin="0px"
              />
            </div>
          ) : (
            <SplitText
              key={`split-text-${getGreeting()}${user?.name || ''}`}
              text={getGreeting() + (user?.name ? ', ' + user.name : '')}
              className="text-4xl font-medium text-text-primary"
              delay={50}
              textAlign="center"
              animationFrom={{ opacity: 0, transform: 'translate3d(0,50px,0)' }}
              animationTo={{ opacity: 1, transform: 'translate3d(0,0,0)' }}
              easing={easings.easeOutCubic}
              threshold={0}
              rootMargin="0px"
            />
          )}
        </div>
        {(isAgent || isAssistant) && description ? (
          <div className="animate-fadeIn mt-2 max-w-md text-center text-sm font-normal text-text-primary">
            {description}
          </div>
        ) : (
          typeof startupConfig?.interface?.customWelcome === 'string' && (
            <div className="animate-fadeIn mt-2 max-w-md text-center text-sm font-normal text-text-primary">
              {startupConfig?.interface?.customWelcome}
            </div>
          )
        )}
      </div>
    </div>
  );
}