import { LogLevel, type LogLine } from "sync-client";

const colors = {
    reset: "\x1b[0m",
    bold: "\x1b[1m",

    red: "\x1b[31m",
    green: "\x1b[32m",
    yellow: "\x1b[33m",
    magenta: "\x1b[35m",
    cyan: "\x1b[36m",
    gray: "\x1b[90m"
} as const;

function colorize(text: string, color: keyof typeof colors): string {
    return `${colors[color]}${text}${colors.reset}`;
}

function formatTimestamp(date: Date): string {
    const [time] = date.toTimeString().split(" ");
    const ms = date.getMilliseconds().toString().padStart(3, "0");
    return colorize(`${time}.${ms}`, "gray");
}

function formatLevel(level: LogLevel): string {
    const levelStr = level.padEnd(7);
    switch (level) {
        case LogLevel.DEBUG:
            return colorize(levelStr, "cyan");
        case LogLevel.INFO:
            return colorize(levelStr, "green");
        case LogLevel.WARNING:
            return colorize(levelStr, "yellow");
        case LogLevel.ERROR:
            return colorize(levelStr, "red");
    }
}

function formatMessage(message: string, level: LogLevel): string {
    // Highlight important parts of the message
    let formatted = message;

    // Highlight file paths
    formatted = formatted.replace(
        /(['"])([^'"]*?\.(json|txt|md|js|ts))(['"])/g,
        (_, q1, path, _ext, q2) => q1 + colorize(path, "magenta") + q2
    );

    // Highlight numbers
    formatted = formatted.replace(/\b(\d+)\b/g, (num) => colorize(num, "cyan"));

    // Highlight patterns like /regex/
    formatted = formatted.replace(/(\/\^[^$]*\$\/)/g, (pattern) =>
        colorize(pattern, "yellow")
    );

    // Make error messages bold
    if (level === LogLevel.ERROR) {
        formatted = colorize(formatted, "bold");
    }

    return formatted;
}

export function formatLogLine(logLine: LogLine): string {
    const timestamp = formatTimestamp(logLine.timestamp);
    const level = formatLevel(logLine.level);
    const message = formatMessage(logLine.message, logLine.level);

    return `${timestamp} ${level} ${message}`;
}