import React, { useContext, useEffect, useMemo, useState } from 'react';
import Typography from '@mui/material/Typography';
import Checkbox from '@mui/material/Checkbox';
import { useTranslation } from 'react-i18next';
import CustomButton from '@/components/customButton/CustomButton';
import CustomInput from '@/components/customInput/CustomInput';
import { useFormValidation } from '@/hooks';
import { formatForm } from '@/utils';
import { useNavigate } from 'react-router-dom';
import { rootContext, authContext, dataContext } from '@/context';
import {
  ATTU_AUTH_HISTORY,
  MILVUS_DATABASE,
  MILVUS_SERVERS,
  MILVUS_URL,
} from '@/consts';
import { CustomRadio } from '@/components/customRadio/CustomRadio';
import Icons from '@/components/icons/Icons';
import CustomToolTip from '@/components/customToolTip/CustomToolTip';
import CustomIconButton from '@/components/customButton/CustomIconButton';
import type { AuthReq } from '@server/types';
import FormControlLabel from '@mui/material/FormControlLabel';
import Box from '@mui/material/Box';
import type { Theme } from '@mui/material';
import Autocomplete from '@mui/material/Autocomplete';
import TextField from '@mui/material/TextField';

// Add Connection type definition back
type Connection = AuthReq & {
  time: number;
};

// Parse server list from environment variables
const parseFixedConnections = (): Connection[] => {
  const serverList = MILVUS_SERVERS || '';
  const defaultUrl = MILVUS_URL || '127.0.0.1:19530';
  const defaultDatabase = MILVUS_DATABASE;

  // If MILVUS_SERVERS exists and is not empty, parse it
  if (serverList && serverList.trim() !== '') {
    return serverList.split(',').map((server: string) => {
      const [address, database] = server.trim().split('/');
      return {
        address: address.trim(),
        database: database?.trim() || defaultDatabase,
        token: '',
        username: '',
        password: '',
        ssl: false,
        checkHealth: true,
        time: -1,
        clientId: '',
      };
    });
  }

  // If MILVUS_SERVERS is empty or doesn't exist, use MILVUS_URL
  return [
    {
      address: defaultUrl,
      database: defaultDatabase,
      token: '',
      username: '',
      password: '',
      ssl: false,
      checkHealth: true,
      time: -1,
      clientId: '',
    },
  ];
};

// Get fixed connections from environment variables
const FIXED_CONNECTIONS: Connection[] = parseFixedConnections();

export const AuthForm = () => {
  // context
  const { openSnackBar } = useContext(rootContext);
  const { authReq, setAuthReq, login } = useContext(authContext);
  const { setDatabase } = useContext(dataContext);

  // i18n
  const { t: commonTrans } = useTranslation();
  const { t: btnTrans } = useTranslation('btn');
  const { t: successTrans } = useTranslation('success');
  const { t: dbTrans } = useTranslation('database');

  // hooks
  const navigate = useNavigate();

  // UI states
  const [withPass, setWithPass] = useState(false);
  const [connections, setConnections] = useState<Connection[]>([]);
  const [isConnecting, setIsConnecting] = useState(false);

  // form validation
  const checkedForm = useMemo(() => {
    return formatForm(authReq);
  }, [authReq]);
  const { validation, checkIsValid, resetValidation } =
    useFormValidation(checkedForm);

  // UI handlers
  // handle input change
  const handleInputChange = (
    key:
      | 'address'
      | 'username'
      | 'password'
      | 'ssl'
      | 'database'
      | 'token'
      | 'checkHealth',
    value: string | boolean
  ) => {
    if (key === 'address' && typeof value === 'string') {
      // Check if address contains database name (format: address/database)
      const parts = value.split('/');
      if (parts.length === 2) {
        setAuthReq(v => ({
          ...v,
          address: parts[0],
          database: parts[1],
        }));
        return;
      }
    }
    setAuthReq(v => ({ ...v, [key]: value }));
  };

  // handle auth toggle
  const handleEnableAuth = (val: boolean) => {
    setWithPass(val);
  };

  // handle connect
  const handleConnect = async (event: React.FormEvent) => {
    event.preventDefault();

    // set connecting
    setIsConnecting(true);

    try {
      // login
      const loginParams = { ...authReq };

      if (!withPass) {
        loginParams.username = '';
        loginParams.password = '';
        loginParams.token = '';
      }
      await login(loginParams);

      // set database
      setDatabase(authReq.database);
      // success message
      openSnackBar(successTrans('connect'));

      // get connection history
      const history = JSON.parse(
        window.localStorage.getItem(ATTU_AUTH_HISTORY) || '[]'
      );

      // add new connection to history, filter out the same connection
      const newHistory = [
        ...history.filter(
          (item: any) =>
            item.address !== authReq.address ||
            item.database !== authReq.database
        ),
        {
          address: authReq.address,
          database: authReq.database,
          username: authReq.username,
          password: authReq.password,
          token: authReq.token,
          time: Date.now(),
          checkHealth: authReq.checkHealth,
        },
      ];

      // if the count of history connections are more than 16, remove the first one, but it should keep the default one
      if (newHistory.length > 16) {
        newHistory.shift();
      }

      // save to local storage
      window.localStorage.setItem(
        ATTU_AUTH_HISTORY,
        JSON.stringify(newHistory)
      );

      // set title
      document.title = authReq.address ? `${authReq.address} - Attu` : 'Attu';

      // redirect to homepage
      navigate('/');
    } catch (error: any) {
      // if not authorized, show auth inputs
      if (error.response.data.message.includes('UNAUTHENTICATED')) {
        handleEnableAuth(true);
      }
    } finally {
      setIsConnecting(false);
    }
  };

  // connect history clicked
  const handleClickOnHisotry = (connection: Connection) => {
    // set auth request
    setAuthReq(connection);
  };

  const handleDeleteConnection = (connection: Connection) => {
    // Don't allow deletion of fixed connections
    if (
      FIXED_CONNECTIONS.some(
        fixed =>
          fixed.address === connection.address &&
          fixed.database === connection.database
      )
    ) {
      return;
    }

    const history = JSON.parse(
      window.localStorage.getItem(ATTU_AUTH_HISTORY) || '[]'
    ) as Connection[];

    const newHistory = history.filter(
      item =>
        item.address !== connection.address ||
        item.database !== connection.database
    );

    if (newHistory.length === 0) {
      newHistory.push(FIXED_CONNECTIONS[0]);
    }

    // save to local storage
    window.localStorage.setItem(ATTU_AUTH_HISTORY, JSON.stringify(newHistory));
    // sort by time
    newHistory.sort((a, b) => {
      return new Date(b.time).getTime() - new Date(a.time).getTime();
    });
    // Combine fixed and history connections
    setConnections([...FIXED_CONNECTIONS, ...newHistory]);
  };

  // Add clear all history handler
  const handleClearAllHistory = () => {
    // Save only the default connection
    const newHistory = [FIXED_CONNECTIONS[0]];
    window.localStorage.setItem(ATTU_AUTH_HISTORY, JSON.stringify(newHistory));
    // Combine fixed and history connections
    setConnections([...FIXED_CONNECTIONS, ...newHistory]);
    // Reset the form to default values
    setAuthReq(FIXED_CONNECTIONS[0]);
  };

  // is button should be disabled
  const btnDisabled = authReq.address.trim().length === 0 || isConnecting;

  // load connection from local storage
  useEffect(() => {
    const historyConnections: Connection[] = JSON.parse(
      window.localStorage.getItem(ATTU_AUTH_HISTORY) || '[]'
    );

    // Start with fixed connections
    const allConnections = [...FIXED_CONNECTIONS];

    // Add history connections, filtering out any that match fixed connections
    const uniqueHistoryConnections = historyConnections.filter(
      historyConn =>
        !FIXED_CONNECTIONS.some(
          fixedConn =>
            fixedConn.address === historyConn.address &&
            fixedConn.database === historyConn.database
        )
    );
    allConnections.push(...uniqueHistoryConnections);

    // Sort by time
    allConnections.sort((a, b) => {
      return new Date(b.time).getTime() - new Date(a.time).getTime();
    });

    setConnections(allConnections);
  }, []);

  // UI effect
  useEffect(() => {
    // if address contains zilliz, or username or password is not empty
    //  set withpass to true
    const withPass =
      (authReq.address.length > 0 && authReq.address.includes('zilliz')) ||
      authReq.username.length > 0 ||
      authReq.password.length > 0;

    // set with pass
    setWithPass(withPass);
    // reset form
    resetValidation(formatForm(authReq));
  }, [authReq.address, authReq.username, authReq.password]);

  return (
    <form onSubmit={handleConnect}>
      <Box
        sx={{
          display: 'flex',
          flexDirection: 'column',
          padding: (theme: Theme) => theme.spacing(0, 3),
          position: 'relative',
          height: '100%',
        }}
      >
        <Box
          sx={{
            textAlign: 'left',
            alignSelf: 'flex-start',
            padding: (theme: Theme) => theme.spacing(2, 0, 1.5),
            '& svg': {
              fontSize: 16,
              marginLeft: (theme: Theme) => theme.spacing(0.5),
              color: 'primary.main',
            },
          }}
        >
          <Typography
            variant="h4"
            component="h4"
            sx={{
              fontSize: 20,
              fontWeight: 600,
              color: 'text.primary',
            }}
          >
            {commonTrans('attu.connectTitle')}
            <CustomToolTip title={commonTrans('attu.connectionTip')}>
              <Icons.info />
            </CustomToolTip>
          </Typography>
        </Box>

        {/* Replace address input with Autocomplete */}
        <Autocomplete
          freeSolo={true}
          options={connections}
          getOptionLabel={option =>
            typeof option === 'string'
              ? option
              : `${option.address}/${option.database}`
          }
          value={connections.find(c => c.address === authReq.address) || null}
          onChange={(event, newValue) => {
            if (newValue) {
              if (typeof newValue === 'string') {
                // Handle free text input
                const [address, database] = newValue.split('/');
                setAuthReq(v => ({
                  ...v,
                  address: address.trim(),
                  database: database?.trim() || MILVUS_DATABASE,
                }));
              } else {
                handleClickOnHisotry(newValue);
              }
            }
          }}
          onInputChange={(event, newInputValue) => {
            // Only update if the input matches a valid connection
            const matchingConnection = connections.find(
              c =>
                `${c.address}/${c.database}`.toLowerCase() ===
                newInputValue.toLowerCase()
            );
            if (matchingConnection) {
              handleClickOnHisotry(matchingConnection);
            } else if (newInputValue) {
              // Handle free text input
              const [address, database] = newInputValue.split('/');
              setAuthReq(v => ({
                ...v,
                address: address.trim(),
                database: database?.trim() || MILVUS_DATABASE,
              }));
            }
          }}
          filterOptions={(options, state) => {
            // Only filter when there's input text
            if (!state.inputValue) {
              return options;
            }
            return options.filter(option =>
              `${option.address}/${option.database}`
                .toLowerCase()
                .includes(state.inputValue.toLowerCase())
            );
          }}
          renderInput={params => (
            <TextField
              {...params}
              label={commonTrans('attu.address')}
              variant="filled"
              required
              error={validation.address?.result}
              helperText={validation.address?.errText}
              sx={{
                margin: (theme: Theme) => theme.spacing(0.5, 0),
                '& .MuiFilledInput-root': {
                  backgroundColor: 'background.default',
                  '&:hover': {
                    backgroundColor: 'action.hover',
                  },
                  '&.Mui-focused': {
                    backgroundColor: 'background.default',
                  },
                },
              }}
            />
          )}
          ListboxProps={{
            sx: {
              '& .MuiAutocomplete-listbox': {
                padding: 0,
                '& li': {
                  padding: (theme: Theme) => theme.spacing(1.5, 2),
                  '&:not(:last-child)': {
                    borderBottom: (theme: Theme) =>
                      `1px solid ${theme.palette.divider}`,
                  },
                },
              },
            },
          }}
          renderOption={(props, option) => {
            // Extract key from props
            const { key, ...otherProps } = props;

            // If it's the last option and there are multiple connections, add clear history option
            if (
              option === connections[connections.length - 1] &&
              connections.length > 1
            ) {
              return (
                <React.Fragment key={`${option.address}-${option.database}`}>
                  <Box
                    component="li"
                    {...otherProps}
                    sx={{
                      display: 'flex',
                      justifyContent: 'space-between',
                      fontSize: '14px',
                      '&:hover': {
                        backgroundColor: (theme: Theme) =>
                          theme.palette.action.hover,
                      },
                    }}
                  >
                    <Box sx={{ display: 'flex', alignItems: 'center', gap: 1 }}>
                      <Icons.link sx={{ fontSize: 16 }} />
                      <Typography>
                        {option.address}/{option.database}
                      </Typography>
                      {(option.username || option.password || option.token) && (
                        <Icons.key
                          sx={{
                            fontSize: 14,
                            color: 'text.secondary',
                            ml: 0.5,
                          }}
                        />
                      )}
                    </Box>
                    {option.time !== -1 &&
                      !FIXED_CONNECTIONS.some(
                        fixed =>
                          fixed.address === option.address &&
                          fixed.database === option.database
                      ) && (
                        <Box
                          sx={{ display: 'flex', alignItems: 'center', gap: 1 }}
                        >
                          <Typography
                            sx={{
                              fontSize: 11,
                              color: 'text.secondary',
                              fontStyle: 'italic',
                            }}
                          >
                            {new Date(option.time).toLocaleString()}
                          </Typography>
                          <CustomIconButton
                            onClick={e => {
                              e.stopPropagation();
                              handleDeleteConnection(option);
                            }}
                            sx={{ padding: '4px' }}
                          >
                            <Icons.cross sx={{ fontSize: 14 }} />
                          </CustomIconButton>
                        </Box>
                      )}
                  </Box>
                  <Box
                    component="li"
                    onClick={handleClearAllHistory}
                    sx={{
                      display: 'flex',
                      alignItems: 'center',
                      gap: 1,
                      fontSize: '12px',
                      borderTop: (theme: Theme) =>
                        `1px solid ${theme.palette.divider}`,
                      color: 'error.main',
                      cursor: 'pointer',
                      padding: (theme: Theme) => theme.spacing(1),
                      marginTop: (theme: Theme) => theme.spacing(1),
                      backgroundColor: (theme: Theme) =>
                        theme.palette.background.default,
                      '&:hover': {
                        backgroundColor: (theme: Theme) =>
                          theme.palette.action.hover,
                      },
                    }}
                  >
                    <Icons.delete sx={{ fontSize: 14 }} />
                    <Typography sx={{ fontWeight: 500 }}>
                      {commonTrans('attu.clearHistory')}
                    </Typography>
                  </Box>
                </React.Fragment>
              );
            }
            // Regular connection option
            return (
              <Box
                component="li"
                key={`${option.address}-${option.database}`}
                {...otherProps}
                sx={{
                  display: 'flex',
                  justifyContent: 'space-between',
                  fontSize: '14px',
                  padding: (theme: Theme) => theme.spacing(1.5, 2),
                  '&:hover': {
                    backgroundColor: (theme: Theme) =>
                      theme.palette.action.hover,
                  },
                }}
              >
                <Box
                  sx={{
                    display: 'flex',
                    alignItems: 'center',
                    gap: 1,
                    minWidth: 0,
                    flex: 1,
                  }}
                >
                  <Icons.link sx={{ fontSize: 16, flexShrink: 0, mt: 0.5 }} />
                  <Typography
                    sx={{
                      wordBreak: 'break-all',
                      lineHeight: 1.5,
                      display: 'flex',
                      alignItems: 'center',
                      gap: 0.5,
                    }}
                  >
                    {option.address}/{option.database}
                    {(option.username || option.password || option.token) && (
                      <Icons.key
                        sx={{
                          fontSize: 14,
                          color: 'text.secondary',
                          flexShrink: 0,
                        }}
                      />
                    )}
                  </Typography>
                </Box>
                {option.time !== -1 && (
                  <Box
                    sx={{
                      display: 'flex',
                      alignItems: 'center',
                      gap: 2,
                      minWidth: 200,
                      justifyContent: 'flex-end',
                    }}
                  >
                    <Typography
                      sx={{
                        fontSize: 11,
                        color: 'text.secondary',
                        fontStyle: 'italic',
                        whiteSpace: 'nowrap',
                      }}
                    >
                      {new Date(option.time).toLocaleString()}
                    </Typography>
                    <CustomIconButton
                      onClick={e => {
                        e.stopPropagation();
                        handleDeleteConnection(option);
                      }}
                      sx={{
                        padding: '4px',
                        marginLeft: 1,
                      }}
                    >
                      <Icons.cross sx={{ fontSize: 14 }} />
                    </CustomIconButton>
                  </Box>
                )}
              </Box>
            );
          }}
        />

        {/* db  */}
        <CustomInput
          type="text"
          textConfig={{
            label: `Milvus ${dbTrans('database')} ${commonTrans('attu.optional')}`,
            key: 'database',
            onChange: (value: string) => handleInputChange('database', value),
            variant: 'filled',
            sx: {
              margin: (theme: Theme) => theme.spacing(0.5, 0),
              '& .MuiFilledInput-root': {
                backgroundColor: 'background.default',
                '&:hover': {
                  backgroundColor: 'action.hover',
                },
                '&.Mui-focused': {
                  backgroundColor: 'background.default',
                },
              },
            },
            placeholder: dbTrans('database'),
            fullWidth: true,
            value: authReq.database,
          }}
          checkValid={checkIsValid}
          validInfo={validation}
          key={commonTrans('attu.database')}
        />

        {/* toggle auth */}
        <Box
          sx={{
            display: 'flex',
            width: '100%',
            justifyContent: 'flex-start',
            marginTop: (theme: Theme) => theme.spacing(1),
          }}
        >
          <CustomRadio
            checked={withPass}
            label={commonTrans('attu.authentication')}
            handleChange={handleEnableAuth}
          />
        </Box>

        {/* token  */}
        {withPass && (
          <>
            <CustomInput
              type="text"
              textConfig={{
                label: `${commonTrans('attu.token')} ${commonTrans('attu.optional')} `,
                key: 'token',
                onChange: (val: string) => handleInputChange('token', val),
                variant: 'filled',
                sx: {
                  margin: (theme: Theme) => theme.spacing(0.5, 0),
                  '& .MuiFilledInput-root': {
                    backgroundColor: 'background.default',
                    '&:hover': {
                      backgroundColor: 'action.hover',
                    },
                    '&.Mui-focused': {
                      backgroundColor: 'background.default',
                    },
                  },
                },
                placeholder: commonTrans('attu.token'),
                fullWidth: true,
                value: authReq.token,
              }}
              checkValid={checkIsValid}
              validInfo={validation}
              key={commonTrans('attu.token')}
            />
            {/* user  */}
            <CustomInput
              type="text"
              textConfig={{
                label: `${commonTrans('attu.username')} ${commonTrans('attu.optional')}`,
                key: 'username',
                onChange: (value: string) =>
                  handleInputChange('username', value),
                variant: 'filled',
                sx: {
                  margin: (theme: Theme) => theme.spacing(0.5, 0),
                  '& .MuiFilledInput-root': {
                    backgroundColor: 'background.default',
                    '&:hover': {
                      backgroundColor: 'action.hover',
                    },
                    '&.Mui-focused': {
                      backgroundColor: 'background.default',
                    },
                  },
                },
                placeholder: commonTrans('attu.username'),
                fullWidth: true,
                value: authReq.username,
              }}
              checkValid={checkIsValid}
              validInfo={validation}
              key={commonTrans('attu.username')}
            />
            {/* pass  */}
            <CustomInput
              type="text"
              textConfig={{
                label: `${commonTrans('attu.password')} ${commonTrans('attu.optional')}`,
                key: 'password',
                onChange: (value: string) =>
                  handleInputChange('password', value),
                variant: 'filled',
                sx: {
                  margin: (theme: Theme) => theme.spacing(0.5, 0),
                  '& .MuiFilledInput-root': {
                    backgroundColor: 'background.default',
                    '&:hover': {
                      backgroundColor: 'action.hover',
                    },
                    '&.Mui-focused': {
                      backgroundColor: 'background.default',
                    },
                  },
                },
                placeholder: commonTrans('attu.password'),
                fullWidth: true,
                type: 'password',
                value: authReq.password,
              }}
              checkValid={checkIsValid}
              validInfo={validation}
              key={commonTrans('attu.password')}
            />
          </>
        )}

        <Box
          sx={{
            marginTop: 'auto',
            padding: (theme: Theme) => theme.spacing(2, 0),
          }}
        >
          <Box
            sx={{
              display: 'flex',
              alignItems: 'center',
              gap: (theme: Theme) => theme.spacing(2),
            }}
          >
            <CustomButton
              type="submit"
              variant="contained"
              disabled={btnDisabled}
              sx={{
                height: 36,
                fontSize: 14,
                fontWeight: 500,
                flex: 1,
              }}
            >
              {btnTrans(isConnecting ? 'connecting' : 'connect')}
            </CustomButton>

            <Box
              sx={{
                display: 'flex',
                alignItems: 'center',
                gap: (theme: Theme) => theme.spacing(1),
                borderLeft: (theme: Theme) =>
                  `1px solid ${theme.palette.divider}`,
                paddingLeft: (theme: Theme) => theme.spacing(2),
              }}
            >
              <FormControlLabel
                control={
                  <Checkbox
                    checked={authReq?.ssl ?? false}
                    onChange={e => handleInputChange('ssl', e.target.checked)}
                    sx={{
                      padding: '4px',
                      '&.Mui-checked': {
                        color: 'primary.main',
                      },
                    }}
                  />
                }
                label={
                  <Typography
                    sx={{
                      fontSize: 13,
                      color: 'text.secondary',
                    }}
                  >
                    {commonTrans('attu.ssl')}
                  </Typography>
                }
              />

              <FormControlLabel
                control={
                  <Checkbox
                    size="small"
                    checked={authReq?.checkHealth ?? true}
                    onChange={(e: React.ChangeEvent<HTMLInputElement>) => {
                      handleInputChange('checkHealth', e.target.checked);
                    }}
                    sx={{
                      padding: '4px',
                      '&.Mui-checked': {
                        color: 'primary.main',
                      },
                    }}
                  />
                }
                label={
                  <Typography
                    sx={{
                      fontSize: 13,
                      color: 'text.secondary',
                    }}
                  >
                    {commonTrans('attu.checkHealth')}
                  </Typography>
                }
              />
            </Box>
          </Box>
        </Box>
      </Box>
    </form>
  );
};