import * as React from 'react';
import {useEffect, useRef, useState} from 'react';
import {NotificationItem} from "./Notifications";
import theme from "./theme";
import {Checkbox, Chip, FormControl, FormControlLabel, InputLabel, Link, Select, useMediaQuery} from "@mui/material";
import TextField from "@mui/material/TextField";
import priority1 from "../img/priority-1.svg";
import priority2 from "../img/priority-2.svg";
import priority3 from "../img/priority-3.svg";
import priority4 from "../img/priority-4.svg";
import priority5 from "../img/priority-5.svg";
import Dialog from "@mui/material/Dialog";
import DialogTitle from "@mui/material/DialogTitle";
import DialogContent from "@mui/material/DialogContent";
import Button from "@mui/material/Button";
import Typography from "@mui/material/Typography";
import IconButton from "@mui/material/IconButton";
import InsertEmoticonIcon from '@mui/icons-material/InsertEmoticon';
import {Close} from "@mui/icons-material";
import MenuItem from "@mui/material/MenuItem";
import {basicAuth, formatBytes, topicShortUrl, validTopic, validUrl} from "../app/utils";
import Box from "@mui/material/Box";
import AttachmentIcon from "./AttachmentIcon";
import DialogFooter from "./DialogFooter";
import api from "../app/Api";
import userManager from "../app/UserManager";
import EmojiPicker from "./EmojiPicker";

const SendDialog = (props) => {
    const [baseUrl, setBaseUrl] = useState("");
    const [topic, setTopic] = useState("");
    const [message, setMessage] = useState("");
    const [messageFocused, setMessageFocused] = useState(true);
    const [title, setTitle] = useState("");
    const [tags, setTags] = useState("");
    const [priority, setPriority] = useState(3);
    const [clickUrl, setClickUrl] = useState("");
    const [attachUrl, setAttachUrl] = useState("");
    const [attachFile, setAttachFile] = useState(null);
    const [filename, setFilename] = useState("");
    const [filenameEdited, setFilenameEdited] = useState(false);
    const [email, setEmail] = useState("");
    const [delay, setDelay] = useState("");
    const [publishAnother, setPublishAnother] = useState(false);

    const [showTopicUrl, setShowTopicUrl] = useState("");
    const [showClickUrl, setShowClickUrl] = useState(false);
    const [showAttachUrl, setShowAttachUrl] = useState(false);
    const [showEmail, setShowEmail] = useState(false);
    const [showDelay, setShowDelay] = useState(false);

    const showAttachFile = !!attachFile && !showAttachUrl;
    const attachFileInput = useRef();
    const [attachFileError, setAttachFileError] = useState("");

    const [activeRequest, setActiveRequest] = useState(null);
    const [status, setStatus] = useState("");
    const disabled = !!activeRequest;

    const [emojiPickerAnchorEl, setEmojiPickerAnchorEl] = useState(null);

    const [dropZone, setDropZone] = useState(false);
    const [sendButtonEnabled, setSendButtonEnabled] = useState(true);

    const open = !!props.openMode;
    const fullScreen = useMediaQuery(theme.breakpoints.down('sm'));

    useEffect(() => {
        window.addEventListener('dragenter', () => {
            props.onDragEnter();
            setDropZone(true);
        });
    }, []);

    useEffect(() => {
        setBaseUrl(props.baseUrl);
        setTopic(props.topic);
        setShowTopicUrl(!props.baseUrl || !props.topic);
        setMessageFocused(!!props.topic); // Focus message only if topic is set
    }, [props.baseUrl, props.topic]);

    useEffect(() => {
        const valid = validUrl(baseUrl) && validTopic(topic) && !attachFileError;
        setSendButtonEnabled(valid);
    }, [baseUrl, topic, attachFileError]);

    useEffect(() => {
        setMessage(props.message);
    }, [props.message]);

    const handleSubmit = async () => {
        const headers = {};
        if (title.trim()) {
            headers["X-Title"] = title.trim();
        }
        if (tags.trim()) {
            headers["X-Tags"] = tags.trim();
        }
        if (priority && priority !== 3) {
            headers["X-Priority"] = priority.toString();
        }
        if (clickUrl.trim()) {
            headers["X-Click"] = clickUrl.trim();
        }
        if (attachUrl.trim()) {
            headers["X-Attach"] = attachUrl.trim();
        }
        if (filename.trim()) {
            headers["X-Filename"] = filename.trim();
        }
        if (email.trim()) {
            headers["X-Email"] = email.trim();
        }
        if (delay.trim()) {
            headers["X-Delay"] = delay.trim();
        }
        if (attachFile && message.trim()) {
            headers["X-Message"] = message.replaceAll("\n", "\\n").trim();
        }
        const body = (attachFile) ? attachFile : message;
        try {
            const user = await userManager.get(baseUrl);
            if (user) {
                headers["Authorization"] = basicAuth(user.username, user.password);
            }
            const progressFn = (ev) => {
                if (ev.loaded > 0 && ev.total > 0) {
                    const percent = Math.round(ev.loaded * 100.0 / ev.total);
                    setStatus(`Uploading ${formatBytes(ev.loaded)}/${formatBytes(ev.total)} (${percent}%) ...`);
                } else {
                    setStatus(`Uploading ...`);
                }
            };
            const request = api.publishXHR(baseUrl, topic, body, headers, progressFn);
            setActiveRequest(request);
            await request;
            if (!publishAnother) {
                props.onClose();
            } else {
                setStatus("Message published");
                setActiveRequest(null);
            }
        } catch (e) {
            setStatus(<Typography sx={{color: 'error.main', maxWidth: "400px"}}>{e}</Typography>);
            setActiveRequest(null);
        }
    };

    const checkAttachmentLimits = async (file) => {
        try {
            const stats = await api.userStats(baseUrl);
            const fileSizeLimit = stats.attachmentFileSizeLimit ?? 0;
            const remainingBytes = stats.visitorAttachmentBytesRemaining ?? 0;
            const fileSizeLimitReached = fileSizeLimit > 0 && file.size > fileSizeLimit;
            const quotaReached = remainingBytes > 0 && file.size > remainingBytes;
            if (fileSizeLimitReached && quotaReached) {
                return setAttachFileError(`exceeds ${formatBytes(fileSizeLimit)} file limit and quota, ${formatBytes(remainingBytes)} remaining`);
            } else if (fileSizeLimitReached) {
                return setAttachFileError(`exceeds ${formatBytes(fileSizeLimit)} file limit`);
            } else if (quotaReached) {
                return setAttachFileError(`exceeds quota, ${formatBytes(remainingBytes)} remaining`);
            }
            setAttachFileError("");
        } catch (e) {
            console.log(`[SendDialog] Retrieving attachment limits failed`, e);
            setAttachFileError(""); // Reset error (rely on server-side checking)
        }
    };

    const handleAttachFileClick = () => {
        attachFileInput.current.click();
    };

    const handleAttachFileChanged = async (ev) => {
        await updateAttachFile(ev.target.files[0]);
    };

    const handleAttachFileDrop = async (ev) => {
        ev.preventDefault();
        setDropZone(false);
        await updateAttachFile(ev.dataTransfer.files[0]);
    };

    const updateAttachFile = async (file) => {
        setAttachFile(file);
        setFilename(file.name);
        props.onResetOpenMode();
        await checkAttachmentLimits(file);
    };

    const handleAttachFileDragLeave = () => {
        setDropZone(false);
        if (props.openMode === SendDialog.OPEN_MODE_DRAG) {
            props.onClose(); // Only close dialog if it was not open before dragging file in
        }
    };

    const handleEmojiClick = (ev) => {
        setEmojiPickerAnchorEl(ev.currentTarget);
    };

    const handleEmojiPick = (emoji) => {
        setTags(tags => (tags.trim()) ? `${tags.trim()}, ${emoji}` : emoji);
    };

    const handleEmojiClose = () => {
        setEmojiPickerAnchorEl(null);
    };

    return (
        <>
            {dropZone && <DropArea
                onDrop={handleAttachFileDrop}
                onDragLeave={handleAttachFileDragLeave}/>
            }
            <Dialog maxWidth="md" open={open} onClose={props.onCancel} fullScreen={fullScreen}>
                <DialogTitle>{(baseUrl && topic) ? `Publish to ${topicShortUrl(baseUrl, topic)}` : "Publish message"}</DialogTitle>
                <DialogContent>
                    {dropZone && <DropBox/>}
                    {showTopicUrl &&
                        <ClosableRow closable={!!props.baseUrl && !!props.topic} disabled={disabled} onClose={() => {
                            setBaseUrl(props.baseUrl);
                            setTopic(props.topic);
                            setShowTopicUrl(false);
                        }}>
                            <TextField
                                margin="dense"
                                label="Server URL"
                                placeholder="Server URL, e.g. https://example.com"
                                value={baseUrl}
                                onChange={ev => setBaseUrl(ev.target.value)}
                                disabled={disabled}
                                type="url"
                                variant="standard"
                                sx={{flexGrow: 1, marginRight: 1}}
                            />
                            <TextField
                                margin="dense"
                                label="Topic"
                                placeholder="Topic name, e.g. phil_alerts"
                                value={topic}
                                onChange={ev => setTopic(ev.target.value)}
                                disabled={disabled}
                                type="text"
                                variant="standard"
                                autoFocus={!messageFocused}
                                sx={{flexGrow: 1}}
                            />
                        </ClosableRow>
                    }
                    <TextField
                        margin="dense"
                        label="Title"
                        value={title}
                        onChange={ev => setTitle(ev.target.value)}
                        disabled={disabled}
                        type="text"
                        fullWidth
                        variant="standard"
                        placeholder="Notification title, e.g. Disk space alert"
                    />
                    <TextField
                        margin="dense"
                        label="Message"
                        placeholder="Type the main message body here."
                        value={message}
                        onChange={ev => setMessage(ev.target.value)}
                        disabled={disabled}
                        type="text"
                        variant="standard"
                        rows={5}
                        autoFocus={messageFocused}
                        fullWidth
                        multiline
                    />
                    <div style={{display: 'flex'}}>
                        <EmojiPicker
                            anchorEl={emojiPickerAnchorEl}
                            onEmojiPick={handleEmojiPick}
                            onClose={handleEmojiClose}
                        />
                        <DialogIconButton disabled={disabled} onClick={handleEmojiClick}>
                            <InsertEmoticonIcon/>
                        </DialogIconButton>
                        <TextField
                            margin="dense"
                            label="Tags"
                            placeholder="Comma-separated list of tags, e.g. warning, srv1-backup"
                            value={tags}
                            onChange={ev => setTags(ev.target.value)}
                            disabled={disabled}
                            type="text"
                            variant="standard"
                            sx={{flexGrow: 1, marginRight: 1}}
                        />
                        <FormControl
                            variant="standard"
                            margin="dense"
                            sx={{minWidth: 120, maxWidth: 200, flexGrow: 1}}
                        >
                            <InputLabel/>
                            <Select
                                label="Priority"
                                margin="dense"
                                value={priority}
                                onChange={(ev) => setPriority(ev.target.value)}
                                disabled={disabled}
                            >
                                {[5,4,3,2,1].map(priority =>
                                    <MenuItem key={`priorityMenuItem${priority}`} value={priority}>
                                        <div style={{ display: 'flex', alignItems: 'center' }}>
                                            <img src={priorities[priority].file} style={{marginRight: "8px"}}/>
                                            <div>{priorities[priority].label}</div>
                                        </div>
                                    </MenuItem>
                                )}
                            </Select>
                        </FormControl>
                    </div>
                    {showClickUrl &&
                        <ClosableRow disabled={disabled} onClose={() => {
                            setClickUrl("");
                            setShowClickUrl(false);
                        }}>
                            <TextField
                                margin="dense"
                                label="Click URL"
                                placeholder="URL that is opened when notification is clicked"
                                value={clickUrl}
                                onChange={ev => setClickUrl(ev.target.value)}
                                disabled={disabled}
                                type="url"
                                fullWidth
                                variant="standard"
                            />
                        </ClosableRow>
                    }
                    {showEmail &&
                        <ClosableRow disabled={disabled} onClose={() => {
                            setEmail("");
                            setShowEmail(false);
                        }}>
                            <TextField
                                margin="dense"
                                label="Email"
                                placeholder="Address to forward the message to, e.g. phil@example.com"
                                value={email}
                                onChange={ev => setEmail(ev.target.value)}
                                disabled={disabled}
                                type="email"
                                variant="standard"
                                fullWidth
                            />
                        </ClosableRow>
                    }
                    {showAttachUrl &&
                        <ClosableRow disabled={disabled} onClose={() => {
                            setAttachUrl("");
                            setFilename("");
                            setFilenameEdited(false);
                            setShowAttachUrl(false);
                        }}>
                            <TextField
                                margin="dense"
                                label="Attachment URL"
                                placeholder="Attach file by URL, e.g. https://f-droid.org/F-Droid.apk"
                                value={attachUrl}
                                onChange={ev => {
                                    const url = ev.target.value;
                                    setAttachUrl(url);
                                    if (!filenameEdited) {
                                        try {
                                            const u = new URL(url);
                                            const parts = u.pathname.split("/");
                                            if (parts.length > 0) {
                                                setFilename(parts[parts.length-1]);
                                            }
                                        } catch (e) {
                                            // Do nothing
                                        }
                                    }
                                }}
                                disabled={disabled}
                                type="url"
                                variant="standard"
                                sx={{flexGrow: 5, marginRight: 1}}
                            />
                            <TextField
                                margin="dense"
                                label="Filename"
                                placeholder="Attachment filename"
                                value={filename}
                                onChange={ev => {
                                    setFilename(ev.target.value);
                                    setFilenameEdited(true);
                                }}
                                disabled={disabled}
                                type="text"
                                variant="standard"
                                sx={{flexGrow: 1}}
                            />
                        </ClosableRow>
                    }
                    <input
                        type="file"
                        ref={attachFileInput}
                        onChange={handleAttachFileChanged}
                        style={{ display: 'none' }}
                    />
                    {showAttachFile && <AttachmentBox
                        file={attachFile}
                        filename={filename}
                        disabled={disabled}
                        error={attachFileError}
                        onChangeFilename={(f) => setFilename(f)}
                        onClose={() => {
                            setAttachFile(null);
                            setAttachFileError("");
                            setFilename("");
                        }}
                    />}
                    {showDelay &&
                        <ClosableRow disabled={disabled} onClose={() => {
                            setDelay("");
                            setShowDelay(false);
                        }}>
                            <TextField
                                margin="dense"
                                label="Delay"
                                placeholder="Delay delivery, e.g. 1649029748, 30m, or tomorrow, 9am"
                                value={delay}
                                onChange={ev => setDelay(ev.target.value)}
                                disabled={disabled}
                                type="text"
                                variant="standard"
                                fullWidth
                            />
                        </ClosableRow>
                    }
                    <Typography variant="body1" sx={{marginTop: 2, marginBottom: 1}}>
                        Other features:
                    </Typography>
                    <div>
                        {!showClickUrl && <Chip clickable disabled={disabled} label="Click URL" onClick={() => setShowClickUrl(true)} sx={{marginRight: 1, marginBottom: 1}}/>}
                        {!showEmail && <Chip clickable disabled={disabled} label="Forward to email" onClick={() => setShowEmail(true)} sx={{marginRight: 1, marginBottom: 1}}/>}
                        {!showAttachUrl && !showAttachFile && <Chip clickable disabled={disabled} label="Attach file by URL" onClick={() => setShowAttachUrl(true)} sx={{marginRight: 1, marginBottom: 1}}/>}
                        {!showAttachFile && !showAttachUrl && <Chip clickable disabled={disabled} label="Attach local file" onClick={() => handleAttachFileClick()} sx={{marginRight: 1, marginBottom: 1}}/>}
                        {!showDelay && <Chip clickable disabled={disabled} label="Delay delivery" onClick={() => setShowDelay(true)} sx={{marginRight: 1, marginBottom: 1}}/>}
                        {!showTopicUrl && <Chip clickable disabled={disabled} label="Change topic" onClick={() => setShowTopicUrl(true)} sx={{marginRight: 1, marginBottom: 1}}/>}
                    </div>
                    <Typography variant="body1" sx={{marginTop: 1, marginBottom: 1}}>
                        For examples and a detailed description of all send features, please
                        refer to the <Link href="/docs" target="_blank">documentation</Link>.
                    </Typography>
                </DialogContent>
                <DialogFooter status={status}>
                    {activeRequest && <Button onClick={() => activeRequest.abort()}>Cancel sending</Button>}
                    {!activeRequest &&
                        <>
                            <FormControlLabel
                                label="Publish another"
                                sx={{marginRight: 2}}
                                control={
                                    <Checkbox size="small" checked={publishAnother} onChange={(ev) => setPublishAnother(ev.target.checked)} />
                                } />
                            <Button onClick={props.onClose}>Cancel</Button>
                            <Button onClick={handleSubmit} disabled={!sendButtonEnabled}>Send</Button>
                        </>
                    }
                </DialogFooter>
            </Dialog>
        </>
    );
};

const Row = (props) => {
    return (
        <div style={{display: 'flex'}}>
            {props.children}
        </div>
    );
};

const ClosableRow = (props) => {
    const closable = (props.hasOwnProperty("closable")) ? props.closable : true;
    return (
        <Row>
            {props.children}
            {closable && <DialogIconButton disabled={props.disabled} onClick={props.onClose} sx={{marginLeft: "6px"}}><Close/></DialogIconButton>}
        </Row>
    );
};

const DialogIconButton = (props) => {
    const sx = props.sx || {};
    return (
        <IconButton
            color="inherit"
            size="large"
            edge="start"
            sx={{height: "45px", marginTop: "17px", ...sx}}
            onClick={props.onClick}
            disabled={props.disabled}
        >
            {props.children}
        </IconButton>
    );
};

const AttachmentBox = (props) => {
    const file = props.file;
    return (
        <>
            <Typography variant="body1" sx={{marginTop: 2}}>
                Attached file:
            </Typography>
            <Box sx={{
                display: 'flex',
                alignItems: 'center',
                padding: 0.5,
                borderRadius: '4px',
            }}>
                <AttachmentIcon type={file.type}/>
                <Box sx={{ marginLeft: 1, textAlign: 'left' }}>
                    <ExpandingTextField
                        minWidth={140}
                        variant="body2"
                        value={props.filename}
                        onChange={(ev) => props.onChangeFilename(ev.target.value)}
                        disabled={props.disabled}
                    />
                    <br/>
                    <Typography variant="body2" sx={{ color: 'text.primary' }}>
                        {formatBytes(file.size)}
                        {props.error &&
                            <Typography component="span" sx={{ color: 'error.main' }}>
                                {" "}({props.error})
                            </Typography>
                        }
                    </Typography>
                </Box>
                <DialogIconButton disabled={props.disabled} onClick={props.onClose} sx={{marginLeft: "6px"}}><Close/></DialogIconButton>
            </Box>
        </>
    );
};

const ExpandingTextField = (props) => {
    const invisibleFieldRef = useRef();
    const [textWidth, setTextWidth] = useState(props.minWidth);
    const determineTextWidth = () => {
        const boundingRect = invisibleFieldRef?.current?.getBoundingClientRect();
        if (!boundingRect) {
            return props.minWidth;
        }
        return (boundingRect.width >= props.minWidth) ? Math.round(boundingRect.width) : props.minWidth;
    };
    useEffect(() => {
        setTextWidth(determineTextWidth() + 5);
    }, [props.value]);
    return (
        <>
            <Typography
                ref={invisibleFieldRef}
                component="span"
                variant={props.variant}
                sx={{position: "absolute", left: "-200%"}}
            >
                {props.value}
            </Typography>
            <TextField
                margin="dense"
                placeholder="Attachment filename"
                value={props.value}
                onChange={props.onChange}
                type="text"
                variant="standard"
                sx={{ width: `${textWidth}px`, borderBottom: "none" }}
                InputProps={{ style: { fontSize: theme.typography[props.variant].fontSize } }}
                inputProps={{ style: { paddingBottom: 0, paddingTop: 0 } }}
                disabled={props.disabled}
            />
        </>
    )
};

const DropArea = (props) => {
    const allowDrag = (ev) => {
        // This is where we could disallow certain files to be dragged in.
        // For now we allow all files.

        ev.dataTransfer.dropEffect = 'copy';
        ev.preventDefault();
    };

    return (
        <Box
            sx={{
                position: 'absolute',
                left: 0,
                top: 0,
                right: 0,
                bottom: 0,
                zIndex: 10002,
            }}
            onDrop={props.onDrop}
            onDragEnter={allowDrag}
            onDragOver={allowDrag}
            onDragLeave={props.onDragLeave}
        />
    );
};

const DropBox = () => {
    return (
        <Box sx={{
            position: 'absolute',
            left: 0,
            top: 0,
            right: 0,
            bottom: 0,
            zIndex: 10000,
            backgroundColor: "#ffffffbb"
        }}>
            <Box
                sx={{
                    position: 'absolute',
                    border: '3px dashed #ccc',
                    borderRadius: '5px',
                    left: "40px",
                    top: "40px",
                    right: "40px",
                    bottom: "40px",
                    zIndex: 10001,
                    display: 'flex',
                    justifyContent: "center",
                    alignItems: "center",
                }}
            >
                <Typography variant="h5">Drop file here</Typography>
            </Box>
        </Box>
    );
}

const priorities = {
    1: { label: "Min. priority", file: priority1 },
    2: { label: "Low priority", file: priority2 },
    3: { label: "Default priority", file: priority3 },
    4: { label: "High priority", file: priority4 },
    5: { label: "Max. priority", file: priority5 }
};

SendDialog.OPEN_MODE_DEFAULT = "default";
SendDialog.OPEN_MODE_DRAG = "drag";

export default SendDialog;