import { useEffect, useMemo, useRef, useState, type RefObject } from 'react';
import { useOutsideClick } from '../../hooks/use-outside-click';
import { useKeydown } from '../../hooks/use-keydown';
import { httpGet } from '../../lib/http';
import type { ResourceType } from '../../lib/resource-progress';
import { topicSelectorAll } from '../../lib/resource-progress';
import CloseIcon from '../../icons/close.svg';
import { deleteUrlParam, getUrlParams } from '../../lib/browser';
import { useAuth } from '../../hooks/use-auth';
import type { GetRoadmapResponse } from '../CustomRoadmap/CustomRoadmap';
import { ReadonlyEditor } from '../../../editor/readonly-editor';
import { ProgressLoadingError } from './ProgressLoadingError';
import { UserProgressModalHeader } from './UserProgressModalHeader';

export type ProgressMapProps = {
  userId?: string;
  resourceId: string;
  resourceType: ResourceType;
  onClose?: () => void;
  isCustomResource?: boolean;
};

type UserProgressResponse = {
  user: {
    _id: string;
    name: string;
  };
  progress: {
    total: number;
    done: string[];
    learning: string[];
    skipped: string[];
  };
};

export function UserCustomProgressModal(props: ProgressMapProps) {
  const {
    resourceId,
    resourceType,
    userId: propUserId,
    onClose: onModalClose,
    isCustomResource,
  } = props;

  const { s: userId = propUserId } = getUrlParams();
  if (!userId) {
    return null;
  }

  const resourceSvgEl = useRef<HTMLDivElement>(null);
  const popupBodyEl = useRef<HTMLDivElement>(null);
  const currentUser = useAuth();

  const [roadmap, setRoadmap] = useState<GetRoadmapResponse | null>(null);
  const [showModal, setShowModal] = useState(!!userId);
  const [progressResponse, setProgressResponse] =
    useState<UserProgressResponse>();

  const [isLoading, setIsLoading] = useState(true);
  const [error, setError] = useState('');

  async function getUserProgress(
    userId: string,
    resourceType: string,
    resourceId: string,
  ): Promise<UserProgressResponse | undefined> {
    const { error, response } = await httpGet<UserProgressResponse>(
      `${
        import.meta.env.PUBLIC_API_URL
      }/v1-get-user-progress/${userId}?resourceType=${resourceType}&resourceId=${resourceId}`,
    );

    if (error || !response) {
      throw error || new Error('Something went wrong. Please try again!');
    }

    return response;
  }

  async function getRoadmapSVG(): Promise<GetRoadmapResponse> {
    const { error, response: roadmapData } = await httpGet<GetRoadmapResponse>(
      `${import.meta.env.PUBLIC_API_URL}/v1-get-roadmap/${resourceId}`,
    );
    if (error || !roadmapData) {
      throw error || new Error('Something went wrong. Please try again!');
    }

    setRoadmap(roadmapData);
    return roadmapData;
  }

  function onClose() {
    deleteUrlParam('s');
    setError('');
    setShowModal(false);

    if (onModalClose) {
      onModalClose();
    } else {
      window.location.reload();
    }
  }

  useKeydown('Escape', () => {
    onClose();
  });

  useOutsideClick(popupBodyEl, () => {
    onClose();
  });

  useEffect(() => {
    if (!resourceId || !resourceType || !userId) {
      return;
    }

    setIsLoading(true);
    Promise.all([
      getRoadmapSVG(),
      getUserProgress(userId, resourceType, resourceId),
    ])
      .then(([_, user]) => {
        if (!user) {
          return;
        }

        setProgressResponse(user);
      })
      .catch((err) => {
        setError(err?.message || 'Something went wrong. Please try again!');
      })
      .finally(() => {
        setIsLoading(false);
      });
  }, [userId]);

  if (currentUser?.id === userId) {
    deleteUrlParam('s');
    return null;
  }

  if (!showModal) {
    return null;
  }

  if (isLoading || error) {
    return <ProgressLoadingError isLoading={isLoading} error={error || ''} />;
  }

  return (
    <div
      id={'user-progress-modal'}
      className="fixed left-0 right-0 top-0 z-50 h-full items-center justify-center overflow-y-auto overflow-x-hidden overscroll-contain bg-black/50"
    >
      <div className="relative mx-auto h-full w-full max-w-4xl p-4 md:h-auto">
        <div
          ref={popupBodyEl}
          className={`popup-body relative rounded-lg bg-white pt-[1px] shadow`}
        >
          <UserProgressModalHeader
            isLoading={isLoading}
            progressResponse={progressResponse}
          />

          <div ref={resourceSvgEl} className="px-4 pb-2">
            <ReadonlyEditor
              variant="modal"
              roadmap={roadmap!}
              className="min-h-[400px]"
              onRendered={(wrapperRef: RefObject<HTMLDivElement>) => {
                const {
                  done = [],
                  learning = [],
                  skipped = [],
                } = progressResponse?.progress || {};

                done?.forEach((topicId: string) => {
                  topicSelectorAll(topicId, wrapperRef?.current!).forEach(
                    (el) => {
                      el.classList.add('done');
                    },
                  );
                });

                learning?.forEach((topicId: string) => {
                  topicSelectorAll(topicId, wrapperRef?.current!).forEach(
                    (el) => {
                      el.classList.add('learning');
                    },
                  );
                });

                skipped?.forEach((topicId: string) => {
                  topicSelectorAll(topicId, wrapperRef?.current!).forEach(
                    (el) => {
                      el.classList.add('skipped');
                    },
                  );
                });
              }}
              fontFamily="Balsamiq Sans"
              fontURL="/fonts/balsamiq.woff2"
            />
          </div>

          <button
            type="button"
            className={`absolute right-2.5 top-3 ml-auto inline-flex items-center rounded-lg bg-gray-100 bg-transparent p-1.5 text-sm text-gray-400 hover:text-gray-900 lg:hidden`}
            onClick={onClose}
          >
            <img alt={'close'} src={CloseIcon.src} className="h-4 w-4" />
            <span className="sr-only">Close modal</span>
          </button>
        </div>
      </div>
    </div>
  );
}