import { Flex, Select, Skeleton, Text, Tooltip } from '@chakra-ui/react';
import React from 'react';

import type { AddressImplementation } from 'types/api/addressParams';
import type { SmartContract } from 'types/api/contract';

import { route } from 'nextjs-routes';

import useApiQuery from 'lib/api/useApiQuery';
import * as stubs from 'stubs/contract';
import CopyToClipboard from 'ui/shared/CopyToClipboard';
import LinkInternal from 'ui/shared/links/LinkInternal';
import CodeEditor from 'ui/shared/monaco/CodeEditor';
import formatFilePath from 'ui/shared/monaco/utils/formatFilePath';

import ContractCodeIdes from './ContractCodeIdes';
import ContractExternalLibraries from './ContractExternalLibraries';

function getEditorData(contractInfo: SmartContract | undefined) {
  if (!contractInfo || !contractInfo.source_code) {
    return undefined;
  }

  const extension = (() => {
    switch (contractInfo.language) {
      case 'vyper':
        return 'vy';
      case 'yul':
        return 'yul';
      default:
        return 'sol';
    }
  })();

  return [
    { file_path: formatFilePath(contractInfo.file_path || `index.${ extension }`), source_code: contractInfo.source_code },
    ...(contractInfo.additional_sources || []).map((source) => ({ ...source, file_path: formatFilePath(source.file_path) })),
  ];
}

interface SourceContractOption {
  address: string;
  label: string;
}

interface Props {
  address: string;
  implementations?: Array<AddressImplementation>;
}

export const ContractSourceCode = ({ address, implementations }: Props) => {

  const options: Array<SourceContractOption> = React.useMemo(() => {
    return [
      { label: 'Proxy', address },
      ...(implementations || [])
        .filter((item) => item.name && item.address !== address)
        .map(({ name, address }, item, array) => ({ address, label: array.length === 1 ? 'Implementation' : `Impl: ${ name }` })),
    ];
  }, [ address, implementations ]);

  const [ sourceContract, setSourceContract ] = React.useState<SourceContractOption>(options[0]);

  const contractQuery = useApiQuery('contract', {
    pathParams: { hash: sourceContract.address },
    queryOptions: {
      refetchOnMount: false,
      placeholderData: stubs.CONTRACT_CODE_VERIFIED,
    },
  });

  const editorData = React.useMemo(() => {
    return getEditorData(contractQuery.data);
  }, [ contractQuery.data ]);

  const isLoading = contractQuery.isPlaceholderData;

  const handleSelectChange = React.useCallback((event: React.ChangeEvent<HTMLSelectElement>) => {
    const nextOption = options.find(({ address }) => address === event.target.value);
    if (nextOption) {
      setSourceContract(nextOption);
    }
  }, [ options ]);

  const heading = (
    <Skeleton isLoaded={ !isLoading } fontWeight={ 500 }>
      <span>Contract source code</span>
      { contractQuery.data?.language &&
        <Text whiteSpace="pre" as="span" variant="secondary" textTransform="capitalize"> ({ contractQuery.data.language })</Text> }
    </Skeleton>
  );

  const select = options.length > 1 ? (
    <Select
      size="xs"
      value={ sourceContract.address }
      onChange={ handleSelectChange }
      w="auto"
      maxW={{ lg: '200px', xl: '400px' }}
      whiteSpace="nowrap"
      textOverflow="ellipsis"
      fontWeight={ 600 }
      borderRadius="base"
    >
      { options.map((option) => <option key={ option.address } value={ option.address }>{ option.label }</option>) }
    </Select>
  ) : null;

  const externalLibraries = contractQuery.data?.external_libraries ?
    <ContractExternalLibraries data={ contractQuery.data.external_libraries } isLoading={ isLoading }/> :
    null;

  const diagramLink = contractQuery?.data?.can_be_visualized_via_sol2uml ? (
    <Tooltip label="Visualize contract code using Sol2Uml JS library">
      <LinkInternal
        href={ route({ pathname: '/visualize/sol2uml', query: { address: sourceContract.address } }) }
        ml={{ base: '0', lg: 'auto' }}
        isLoading={ isLoading }
      >
        <Skeleton isLoaded={ !isLoading }>
            View UML diagram
        </Skeleton>
      </LinkInternal>
    </Tooltip>
  ) : null;

  const ides = <ContractCodeIdes hash={ sourceContract.address } isLoading={ isLoading }/>;

  const copyToClipboard = contractQuery.data && editorData?.length === 1 ? (
    <CopyToClipboard
      text={ contractQuery.data.source_code }
      isLoading={ isLoading }
      ml={{ base: 'auto', lg: diagramLink ? '0' : 'auto' }}
    />
  ) :
    null;

  const content = (() => {
    if (isLoading) {
      return <Skeleton h="557px" w="100%"/>;
    }

    if (!editorData) {
      return null;
    }

    return (
      <CodeEditor
        key={ sourceContract.address }
        data={ editorData }
        remappings={ contractQuery.data?.compiler_settings?.remappings }
        libraries={ contractQuery.data?.external_libraries ?? undefined }
        language={ contractQuery.data?.language ?? undefined }
        mainFile={ editorData[0]?.file_path }
        contractName={ contractQuery.data?.name ?? undefined }
      />
    );
  })();

  return (
    <section>
      <Flex alignItems="center" mb={ 3 } columnGap={ 3 } rowGap={ 2 } flexWrap="wrap">
        { heading }
        { select }
        { externalLibraries }
        { diagramLink }
        { ides }
        { copyToClipboard }
      </Flex>
      { content }
    </section>
  );
};

export default React.memo(ContractSourceCode);