// Server Observations display - shows fastfetch output
import { safeJson } from './utils/fetch.mjs';
import STATUS from './status.mjs';
import WeatherDisplay from './weatherdisplay.mjs';
import { registerDisplay } from './navigation.mjs';
import { debugFlag } from './utils/debug.mjs';
import { withBasePath } from './utils/base-path.mjs';

const LINES_PER_PAGE = 4;
const PAGE_DURATION_MS = 7000;
const ALLOWED_KEYS = new Set(['OS', 'Kernel', 'Uptime', 'CPU', 'GPU', 'Memory', 'Disk']);
const MAX_LINE_LENGTH = 34;

const isAllowedObservationKey = (key) => ALLOWED_KEYS.has(key) || key.startsWith('Disk');

const truncateLine = (text, maxLength = MAX_LINE_LENGTH) => {
	if (text.length <= maxLength) return text;
	return `${text.slice(0, maxLength - 3)}...`;
};

const roundOneDecimal = (value) => {
	const rounded = Number(value).toFixed(1);
	return rounded.endsWith('.0') ? rounded.slice(0, -2) : rounded;
};

const formatMemoryOrDisk = (value) => {
	const cleaned = value.replace(/\s*\(\d+%\)/, '').replace(/\s*- .*/, '').trim();
	const unitMatch = cleaned.match(/([\d.]+)\s*(TiB|GiB|MiB|KiB|TB|GB|MB|KB|B)\s*\/\s*([\d.]+)\s*(TiB|GiB|MiB|KiB|TB|GB|MB|KB|B)/);
	if (!unitMatch) return cleaned;
	return `${roundOneDecimal(unitMatch[1])} / ${roundOneDecimal(unitMatch[3])} ${unitMatch[2]}`;
};

const formatValue = (key, value) => {
	switch (key) {
		case 'OS':
			return value
				.replace(/\s*\([^)]*\)\s*(x86_64|aarch64|arm64|i386|i686|amd64)/gi, '')
				.replace(/\s*(x86_64|aarch64|arm64|i386|i686|amd64)/gi, '')
				.trim();
		case 'Kernel':
			return value.replace(/(-[a-zA-Z0-9._-]+)+$/, '').trim();
		case 'Uptime':
			return value
				.replace(/ days?/g, 'd')
				.replace(/ hours?/g, 'h')
				.replace(/ mins?/g, 'm')
				.replace(/ secs?/g, 's');
		case 'CPU': {
			const match = value.match(/(Intel Core i\d+(?:-\d+\w*)?|Intel Xeon|Intel Pentium|Intel Celeron|AMD Ryzen \d+(?: \d+\w*)?|AMD FX|AMD Athlon|Apple M\d+|ARM Cortex|Qualcomm Snapdragon)/i);
			if (match) return match[1];
			return value
				.replace(/\(R\)/g, '')
				.replace(/\(TM\)/g, '')
				.replace(/\s*\(\d+\)\s*@\s*[\d.]+ GHz.*/, '')
				.trim();
		}
		case 'GPU':
			return value
				.replace(/\(R\)/g, '')
				.replace(/\(TM\)/g, '')
				.replace(/ Integrated Graphics Controller.*/i, '')
				.replace(/ @ [\d.]+ GHz.*/, '')
				.replace(/ \[.*\]$/, '')
				.trim();
		case 'Memory':
			return formatMemoryOrDisk(value);
		default:
			if (key.startsWith('Disk')) return formatMemoryOrDisk(value);
			return value;
	}
};

const parseServerObservationLine = (line) => {
	const trimmed = line.trim();
	if (!trimmed) return null;

	const separators = [' == ', ': '];
	const parsedLine = separators.map((separator) => {
		const separatorIndex = trimmed.indexOf(separator);
		if (separatorIndex > 0) {
			const key = trimmed.slice(0, separatorIndex).trim();
			const value = trimmed.slice(separatorIndex + separator.length).trim();
			if (key && value && isAllowedObservationKey(key)) {
				return { key, value: formatValue(key, value) };
			}
		}
		return null;
	}).find((entry) => entry);

	return parsedLine ?? null;
};

class ServerObservations extends WeatherDisplay {
	constructor(navId, elemId) {
		super(navId, elemId, 'Server Observations', true);
		this.timing.baseDelay = PAGE_DURATION_MS;
	}

	async getData(weatherParameters, refresh) {
		if (!super.getData(weatherParameters, refresh)) return;

		try {
			// Fetch server info from the API
			const response = await safeJson(withBasePath('api/server-info'), {
				retryCount: 0,
			});

			// Check if fastfetch is available
			if (!response || !response.success) {
				if (debugFlag('serverobservations')) {
					console.log('Server Observations: fastfetch not available');
				}
				this.setStatus(STATUS.noData);
				return;
			}

			this.data = response.data;
			this.setStatus(STATUS.loaded);
		} catch (error) {
			if (debugFlag('serverobservations')) {
				console.log('Server Observations: error fetching data:', error.message);
			}
			this.setStatus(STATUS.noData);
		}
	}

	async drawCanvas() {
		super.drawCanvas();

		// Get the output container
		const outputElem = this.elem.querySelector('.server-output');
		const container = this.elem.querySelector('.container');

		// Split the fastfetch output into lines
		const infoLines = this.data.split('\n')
			.map((line) => parseServerObservationLine(line))
			.filter((line) => line);

		const pages = [];
		for (let i = 0; i < infoLines.length; i += LINES_PER_PAGE) {
			pages.push(infoLines.slice(i, i + LINES_PER_PAGE));
		}

		outputElem.innerHTML = '';
		pages.forEach((pageLines) => {
			const pageElem = document.createElement('div');
			pageElem.className = 'server-page';

			pageLines.forEach((line) => {
				const lineDiv = document.createElement('div');
				lineDiv.className = 'server-line';
				lineDiv.textContent = truncateLine(`${line.key}: ${line.value}`);
				pageElem.appendChild(lineDiv);
			});

			outputElem.appendChild(pageElem);
		});

		this.pageHeight = container.offsetHeight;
		this.timing.totalScreens = Math.max(1, pages.length);
		this.timing.delay = new Array(this.timing.totalScreens).fill(1);
		this.calcNavTiming();

		const top = -this.screenIndex * this.pageHeight;
		outputElem.style.top = `${top}px`;

		this.finishDraw();
	}
}

// Register display with navId 13 (after other displays)
registerDisplay(new ServerObservations(13, 'server-observations'));