/******************************************************************************
 * Copyright (c) 2026 Contributors to the Eclipse Foundation.
 *
 * See the NOTICE file(s) distributed with this work for additional
 * information regarding copyright ownership.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License 2.0 which is available at
 * https://www.eclipse.org/legal/epl-2.0.
 *
 * SPDX-License-Identifier: EPL-2.0
 *****************************************************************************/

import { ChangeEvent, FunctionComponent, useState } from 'react';
import {
    Button,
    Dialog,
    DialogTitle,
    DialogContent,
    DialogContentText,
    Box,
    TextField,
    DialogActions,
    IconButton,
    Tooltip,
    LinearProgress
} from '@mui/material';
import ContentCopyIcon from '@mui/icons-material/ContentCopy';
import VisibilityIcon from '@mui/icons-material/Visibility';
import VisibilityOffIcon from '@mui/icons-material/VisibilityOff';
import InputAdornment from '@mui/material/InputAdornment';
import OutlinedInput from '@mui/material/OutlinedInput';
import copy from 'clipboard-copy';

const TOKEN_DESCRIPTION_SIZE = 255;

export const GenerateTokenDialog: FunctionComponent<GenerateTokenDialogProps> = props => {
    const [loading, setLoading] = useState(false);
    const [description, setDescription] = useState('');
    const [descriptionError, setDescriptionError] = useState<string>();
    const [tokenValue, setTokenValue] = useState<string>();
    const [copied, setCopied] = useState(false);
    const [showToken, setShowToken] = useState(false);

    const { open, onClose, title = 'Generate new token' } = props;

    const resetState = () => {
        setLoading(false);
        setDescription('');
        setDescriptionError(undefined);
        setTokenValue(undefined);
        setCopied(false);
        setShowToken(false);
    };

    const handleClose = () => {
        if (!loading) {
            onClose();
            resetState();
        }
    };

    const handleDescriptionChange = (event: ChangeEvent<HTMLInputElement>) => {
        const value = event.target.value;
        setDescription(value);
        setDescriptionError(
            value.length > TOKEN_DESCRIPTION_SIZE
                ? `Description must not exceed ${TOKEN_DESCRIPTION_SIZE} characters.`
                : undefined
        );
    };

    const handleGenerate = async () => {
        setLoading(true);
        try {
            const value = await props.onGenerate(description);
            setTokenValue(value);
        } catch (err) {
            props.onError?.(err);
        } finally {
            setLoading(false);
        }
    };

    const handleCopy = () => {
        if (tokenValue) {
            copy(tokenValue).then(() => setCopied(true));
            setTimeout(() => setCopied(false), 2000);
        }
    };

    const canGenerate = !descriptionError && !loading;

    return (
        <>
            {open && (
                <Dialog open={open} onClose={handleClose}>
                    <DialogTitle>{title}</DialogTitle>
                    {loading && <LinearProgress color='secondary' />}
                    <DialogContent>
                        {tokenValue ? (
                            <>
                                <DialogContentText sx={{ mb: 2 }}>
                                    Copy this token now. It will not be shown again.
                                </DialogContentText>
                                <OutlinedInput
                                    fullWidth
                                    readOnly
                                    type={showToken ? 'text' : 'password'}
                                    value={tokenValue}
                                    sx={{ fontFamily: 'monospace', fontSize: '0.85rem' }}
                                    endAdornment={
                                        <InputAdornment position='end'>
                                            <Tooltip title={showToken ? 'Hide' : 'Show'} placement='top'>
                                                <IconButton size='small' onClick={() => setShowToken(v => !v)}>
                                                    {showToken ? (
                                                        <VisibilityOffIcon fontSize='small' />
                                                    ) : (
                                                        <VisibilityIcon fontSize='small' />
                                                    )}
                                                </IconButton>
                                            </Tooltip>
                                            <Tooltip title={copied ? 'Copied!' : 'Copy'} placement='top'>
                                                <IconButton size='small' onClick={handleCopy}>
                                                    <ContentCopyIcon fontSize='small' />
                                                </IconButton>
                                            </Tooltip>
                                        </InputAdornment>
                                    }
                                />
                            </>
                        ) : (
                            <>
                                <DialogContentText>
                                    You can add an optional description to help identify where this token is used.
                                </DialogContentText>
                                <Box mt={2}>
                                    <TextField
                                        autoFocus
                                        fullWidth
                                        label='Description (optional)'
                                        error={Boolean(descriptionError)}
                                        helperText={descriptionError}
                                        value={description}
                                        onChange={handleDescriptionChange}
                                        onKeyDown={e => {
                                            if (e.key === 'Enter' && canGenerate) {
                                                handleGenerate();
                                            }
                                        }}
                                    />
                                </Box>
                            </>
                        )}
                    </DialogContent>
                    <DialogActions>
                        <Button onClick={handleClose} color='secondary'>
                            {tokenValue ? 'Close' : 'Cancel'}
                        </Button>
                        {!tokenValue && (
                            <Button
                                variant='contained'
                                color='secondary'
                                disabled={!canGenerate}
                                onClick={handleGenerate}>
                                Generate Token
                            </Button>
                        )}
                    </DialogActions>
                </Dialog>
            )}
        </>
    );
};

export interface GenerateTokenDialogProps {
    open: boolean;
    onClose: () => void;
    onGenerate: (description: string) => Promise<string>;
    onError?: (err: unknown) => void;
    title?: string;
}