import React, { useEffect, useState } from 'react';
import projectApi from '../../store/project/api';
import PropTypes from 'prop-types';
import {
    Select,
    MenuItem,
    TextField,
    CircularProgress,
    InputLabel,
    FormControl,
    Grid,
    Button,
    Icon,
    InputAdornment,
} from '@material-ui/core';

import Autocomplete from '@material-ui/lab/Autocomplete';

function AddUserComponent({ roles, addUserToRole }) {
    const [user, setUser] = useState();
    const [role, setRole] = useState({});
    const [options, setOptions] = useState([]);
    const [loading, setLoading] = useState(false);

    useEffect(() => {
        if (roles.length > 0) {
            const regularRole = roles.find(r => r.name.toLowerCase() === 'regular');
            setRole(regularRole || roles[0]);
        }
    }, [roles]);

    const search = async q => {
        if (q.length > 1) {
            setLoading(true);
            // TODO: Do not hard-code fetch here.
            const users = await projectApi.searchProjectUser(q);
            setOptions([...users]);
        } else {
            setOptions([]);
        }

        setLoading(false);
    };

    const handleQueryUpdate = evt => {
        const q = evt.target.value;
        search(q);
    };

    const handleSelectUser = (evt, value) => {
        setOptions([]);
        setUser(value);
    };

    const handleRoleChange = evt => {
        const roleId = +evt.target.value;
        const role = roles.find(r => r.id === roleId);
        setRole(role);
    };

    const handleSubmit = async evt => {
        evt.preventDefault();
        await addUserToRole(user.id, role.id);
        setUser(undefined);
        setOptions([]);
    };

    return (
        <Grid container justify="center" spacing={3} alignItems="flex-end">
            <Grid item>
                <Autocomplete
                    id="add-user-component"
                    style={{ width: 300 }}
                    noOptionsText="No users found."
                    onChange={handleSelectUser}
                    autoSelect={false}
                    value={user || ''}
                    freeSolo
                    getOptionSelected={() => true}
                    filterOptions={o => o}
                    getOptionLabel={option => {
                        if (option) {
                            return `${option.name || '(Empty name)'} <${option.email || option.username}>`;
                        } else return '';
                    }}
                    options={options}
                    loading={loading}
                    renderInput={params => (
                        <TextField
                            {...params}
                            label="User"
                            name="search"
                            onChange={handleQueryUpdate}
                            InputProps={{
                                ...params.InputProps,
                                startAdornment: (
                                    <InputAdornment position="start">
                                        <Icon>search</Icon>
                                    </InputAdornment>
                                ),
                                endAdornment: (
                                    <React.Fragment>
                                        {loading ? <CircularProgress color="inherit" size={20} /> : null}
                                        {params.InputProps.endAdornment}
                                    </React.Fragment>
                                ),
                            }}
                        />
                    )}
                />
            </Grid>
            <Grid item>
                <FormControl>
                    <InputLabel id="add-user-select-role-label">Role</InputLabel>
                    <Select
                        labelId="add-user-select-role-label"
                        id="add-user-select-role"
                        placeholder="Project role"
                        value={role.id || ''}
                        onChange={handleRoleChange}
                    >
                        {roles.map(role => (
                            <MenuItem key={role.id} value={role.id}>
                                {role.name}
                            </MenuItem>
                        ))}
                    </Select>
                </FormControl>
            </Grid>
            <Grid item>
                <Button variant="contained" color="primary" disabled={!user} onClick={handleSubmit}>
                    Add user
                </Button>
            </Grid>
        </Grid>
    );
}
AddUserComponent.propTypes = {
    roles: PropTypes.array.isRequired,
    addUserToRole: PropTypes.func.isRequired,
};

export default AddUserComponent;