"use client"

import styles from './chatMessage.module.css';

import markdownIt from 'markdown-it';
import mditHljs from "markdown-it-highlightjs";
import React, { useEffect, useRef, useState } from 'react';

import 'katex/dist/katex.min.css';

import { TeaserReferencesSection, constructAllReferences } from '../referencePanel/referencePanel';

import { ThumbsUp, ThumbsDown, Copy, Brain, Cloud, Folder, Book, Aperture, SpeakerHigh, MagnifyingGlass } from '@phosphor-icons/react';

import * as DomPurify from 'dompurify';

const md = new markdownIt({
    html: true,
    linkify: true,
    typographer: true
});

md.use(mditHljs, {
    inline: true,
    code: true
});

export interface Context {
    compiled: string;
    file: string;
}

export interface WebPage {
    link: string;
    query: string;
    snippet: string;
}

interface OrganicContext {
    snippet: string;
    title: string;
    link: string;
}

interface PeopleAlsoAsk {
    link: string;
    question: string;
    snippet: string;
    title: string;
}

export interface OnlineContextData {
    webpages: WebPage[];
    answerBox: {
        answer: string;
        source: string;
        title: string;
    }
    knowledgeGraph: {
        attributes: {
            [key: string]: string;
        }
        description: string;
        descriptionLink: string;
        descriptionSource: string;
        imageUrl: string;
        title: string;
        type: string;
    }
    organic: OrganicContext[];
    peopleAlsoAsk: PeopleAlsoAsk[];
}

interface AgentData {
    name: string;
    avatar: string;
    slug: string;
    persona: string;
}

interface Intent {
    type: string;
    query: string;
    "memory-type": string;
    "inferred-queries": string[];
}

export interface SingleChatMessage {
    automationId: string;
    by: string;
    message: string;
    context: Context[];
    created: string;
    onlineContext: {
        [key: string]: OnlineContextData
    }
    rawQuery?: string;
    intent?: Intent;
}

export interface StreamMessage {
    rawResponse: string;
    trainOfThought: string[];
    context: Context[];
    onlineContext: {
        [key: string]: OnlineContextData
    }
    completed: boolean;
    rawQuery: string;
    timestamp: string;
}

export interface ChatHistoryData {
    chat: SingleChatMessage[];
    agent: AgentData;
    conversation_id: string;
    slug: string;
}

function sendFeedback(uquery: string, kquery: string, sentiment: string) {
    fetch('/api/chat/feedback', {
        method: 'POST',
        headers: {
            'Content-Type': 'application/json'
        },
        body: JSON.stringify({ uquery: uquery, kquery: kquery, sentiment: sentiment })
    })
}

function FeedbackButtons({ uquery, kquery }: { uquery: string, kquery: string }) {
    return (
        <div className={`${styles.feedbackButtons} flex align-middle justify-center items-center`}>
            <button title="Like" className={styles.thumbsUpButton} onClick={() => sendFeedback(uquery, kquery, 'positive')}>
                <ThumbsUp alt="Like Message" color='hsl(var(--muted-foreground))' />
            </button>
            <button title="Dislike" className={styles.thumbsDownButton} onClick={() => sendFeedback(uquery, kquery, 'negative')}>
                <ThumbsDown alt="Dislike Message" color='hsl(var(--muted-foreground))' />
            </button>
        </div>
    )
}

interface ChatMessageProps {
    chatMessage: SingleChatMessage;
    isMobileWidth: boolean;
    customClassName?: string;
    borderLeftColor?: string;
    isLastMessage?: boolean;
}

interface TrainOfThoughtProps {
    message: string;
    primary: boolean;
}

function chooseIconFromHeader(header: string, iconColor: string) {
    const compareHeader = header.toLowerCase();
    const classNames = `inline mt-1 mr-2 ${iconColor}`;
    if (compareHeader.includes("understanding")) {
        return <Brain className={`${classNames}`} />
    }

    if (compareHeader.includes("generating")) {
        return <Cloud className={`${classNames}`} />;
    }

    if (compareHeader.includes("data sources")) {
        return <Folder className={`${classNames}`} />;
    }

    if (compareHeader.includes("notes")) {
        return <Folder className={`${classNames}`} />;
    }

    if (compareHeader.includes("read")) {
        return <Book className={`${classNames}`} />;
    }

    if (compareHeader.includes("search")) {
        return <MagnifyingGlass className={`${classNames}`} />;
    }

    if (compareHeader.includes("summary") || compareHeader.includes("summarize")) {
        return <Aperture className={`${classNames}`} />;
    }

    return <Brain className={`${classNames}`} />;
}

export function TrainOfThought(props: TrainOfThoughtProps) {
    // The train of thought comes in as a markdown-formatted string. It starts with a heading delimited by two asterisks at the start and end and a colon, followed by the message. Example: **header**: status. This function will parse the message and render it as a div.
    let extractedHeader = props.message.match(/\*\*(.*)\*\*/);
    let header = extractedHeader ? extractedHeader[1] : "";
    const iconColor = props.primary ? 'text-orange-400' : 'text-gray-500';
    const icon = chooseIconFromHeader(header, iconColor);
    let markdownRendered = DomPurify.sanitize(md.render(props.message));
    return (
        <div className={`flex items-center ${props.primary ? 'text-gray-400' : 'text-gray-300'} ${styles.trainOfThought} ${props.primary ? styles.primary : ''}`} >
            {icon}
            <div dangerouslySetInnerHTML={{ __html: markdownRendered }} />
        </div>
    )
}

export default function ChatMessage(props: ChatMessageProps) {
    const [copySuccess, setCopySuccess] = useState<boolean>(false);
    const [isHovering, setIsHovering] = useState<boolean>(false);
    const [markdownRendered, setMarkdownRendered] = useState<string>('');
    const messageRef = useRef<HTMLDivElement>(null);

    useEffect(() => {
        let message = props.chatMessage.message;

        // Replace LaTeX delimiters with placeholders
        message = message.replace(/\\\(/g, 'LEFTPAREN').replace(/\\\)/g, 'RIGHTPAREN')
            .replace(/\\\[/g, 'LEFTBRACKET').replace(/\\\]/g, 'RIGHTBRACKET');

        if (props.chatMessage.intent && props.chatMessage.intent.type == "text-to-image") {
            message = `![generated image](data:image/png;base64,${message})`;
        } else if (props.chatMessage.intent && props.chatMessage.intent.type == "text-to-image2") {
            message = `![generated image](${message})`;
        } else if (props.chatMessage.intent && props.chatMessage.intent.type == "text-to-image-v3") {
            message = `![generated image](data:image/webp;base64,${message})`;
        }
        if (props.chatMessage.intent && props.chatMessage.intent.type.includes("text-to-image") && props.chatMessage.intent["inferred-queries"]?.length > 0) {
            message += `\n\n**Inferred Query**\n\n${props.chatMessage.intent["inferred-queries"][0]}`;
        }

        let markdownRendered = md.render(message);

        // Replace placeholders with LaTeX delimiters
        markdownRendered = markdownRendered.replace(/LEFTPAREN/g, '\\(').replace(/RIGHTPAREN/g, '\\)')
            .replace(/LEFTBRACKET/g, '\\[').replace(/RIGHTBRACKET/g, '\\]');

        // Sanitize and set the rendered markdown
        setMarkdownRendered(DomPurify.sanitize(markdownRendered));
    }, [props.chatMessage.message]);

    useEffect(() => {
        if (copySuccess) {
            setTimeout(() => {
                setCopySuccess(false);
            }, 2000);
        }
    }, [copySuccess]);

    useEffect(() => {
        if (messageRef.current) {
            const preElements = messageRef.current.querySelectorAll('pre > .hljs');
            preElements.forEach((preElement) => {
                const copyButton = document.createElement('button');
                const copyImage = document.createElement('img');
                copyImage.src = '/static/copy-button.svg';
                copyImage.alt = 'Copy';
                copyImage.width = 24;
                copyImage.height = 24;
                copyButton.appendChild(copyImage);
                copyButton.className = `hljs ${styles.codeCopyButton}`
                copyButton.addEventListener('click', () => {
                    let textContent = preElement.textContent || '';
                    // Strip any leading $ characters
                    textContent = textContent.replace(/^\$+/, '');
                    // Remove 'Copy' if it's at the start of the string
                    textContent = textContent.replace(/^Copy/, '');
                    textContent = textContent.trim();
                    navigator.clipboard.writeText(textContent);
                    copyImage.src = '/static/copy-button-success.svg';
                });
                preElement.prepend(copyButton);
            });
        }
    }, [markdownRendered, isHovering, messageRef]);

    if (!props.chatMessage.message) {
        return null;
    }

    function formatDate(timestamp: string) {
        // Format date in HH:MM, DD MMM YYYY format
        let date = new Date(timestamp + "Z");
        let time_string = date.toLocaleTimeString('en-IN', { hour: '2-digit', minute: '2-digit', hour12: true }).toUpperCase();
        let date_string = date.toLocaleString('en-IN', { year: 'numeric', month: 'short', day: '2-digit'}).replaceAll('-', ' ');
        return `${time_string} on ${date_string}`;
    }

    function renderTimeStamp(timestamp: string) {
        if (!timestamp.endsWith('Z')) {
            timestamp = timestamp + 'Z';
        }
        const messageDateTime = new Date(timestamp);
        const currentDateTime = new Date();
        const timeDiff = currentDateTime.getTime() - messageDateTime.getTime();

        if (timeDiff < 60e3) {
            return "Just now";
        }

        if (timeDiff < 3600e3) {
            // Using Math.round for closer to actual time representation
            return `${Math.round(timeDiff / 60e3)}m ago`;
        }

        if (timeDiff < 86400e3) {
            return `${Math.round(timeDiff / 3600e3)}h ago`;
        }

        return `${Math.round(timeDiff / 86400e3)}d ago`;
    }

    function constructClasses(chatMessage: SingleChatMessage) {
        let classes = [styles.chatMessageContainer];
        classes.push(styles[chatMessage.by]);

        if (props.customClassName) {
            classes.push(styles[`${chatMessage.by}${props.customClassName}`])
        }

        return classes.join(' ');
    }

    function chatMessageWrapperClasses(chatMessage: SingleChatMessage) {
        let classes = [styles.chatMessageWrapper];
        classes.push(styles[chatMessage.by]);

        if (chatMessage.by === "khoj") {
            const dynamicBorderColor = `border-l-${props.borderLeftColor}`;
            classes.push(`border-l-4 border-opacity-50 border-l-orange-400 ${dynamicBorderColor}`);
        }

        return classes.join(' ');
    }

    const allReferences = constructAllReferences(props.chatMessage.context, props.chatMessage.onlineContext);

    return (
        <div
            className={constructClasses(props.chatMessage)}
            onMouseLeave={(event) => setIsHovering(false)}
            onMouseEnter={(event) => setIsHovering(true)}
            onClick={props.chatMessage.by === "khoj" ? (event) => undefined : undefined}>
            <div className={chatMessageWrapperClasses(props.chatMessage)}>
                <div ref={messageRef} className={styles.chatMessage} dangerouslySetInnerHTML={{ __html: markdownRendered }} />
            </div>
            <div className={styles.teaserReferencesContainer}>
                <TeaserReferencesSection
                    isMobileWidth={props.isMobileWidth}
                    notesReferenceCardData={allReferences.notesReferenceCardData}
                    onlineReferenceCardData={allReferences.onlineReferenceCardData} />
            </div>
            <div className={styles.chatFooter}>
                {
                    (isHovering || props.isMobileWidth || props.isLastMessage) &&
                    (
                        <>
                            <div title={formatDate(props.chatMessage.created)} className={`text-gray-400 relative top-0 left-4`}>
                                {renderTimeStamp(props.chatMessage.created)}
                            </div>
                            <div className={styles.chatButtons}>
                                {
                                    (props.chatMessage.by === "khoj") &&
                                    (
                                        <button title="Speak" onClick={(event) => console.log("speaker")}>
                                            <SpeakerHigh alt="Speak Message" color='hsl(var(--muted-foreground))' />
                                        </button>
                                    )
                                }
                                <button title="Copy" className={`${styles.copyButton}`} onClick={() => {
                                    navigator.clipboard.writeText(props.chatMessage.message);
                                    setCopySuccess(true);
                                }}>
                                    {
                                        copySuccess ?
                                            <Copy alt="Copied Message" weight="fill" color='green' />
                                            : <Copy alt="Copy Message" color='hsl(var(--muted-foreground))' />
                                    }
                                </button>
                                {
                                    (props.chatMessage.by === "khoj") &&
                                    (
                                        props.chatMessage.intent ?
                                            <FeedbackButtons
                                                uquery={props.chatMessage.intent.query}
                                                kquery={props.chatMessage.message} />
                                            : <FeedbackButtons
                                                uquery={props.chatMessage.rawQuery || props.chatMessage.message}
                                                kquery={props.chatMessage.message} />
                                    )
                                }
                            </div>
                        </>
                    )
                }
            </div>
        </div>
    )
}