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pragma Singleton
// pragma ComponentBehavior: Bound

import QtQuick
import Quickshell
import Quickshell.Io
import qs.config

Singleton {
	id: root

	property double memoryTotal: 1
	property double memoryFree: 1
	property double memoryUsed: memoryTotal - memoryFree
	property double memoryUsedPercentage: memoryUsed / memoryTotal
	property double swapTotal: 1
	property double swapFree: 1
	property double swapUsed: swapTotal - swapFree
	property double swapUsedPercentage: swapTotal > 0 ? (swapUsed / swapTotal) : 0

	property double cpuUsage: 0
	property double cpuTemp: 0
	property double cpuFreq: 0
	property var previousCpuStats

	property int gpuUsage: 0
	property int gpuTemp: 0

	Timer {
		interval: General.resourceUpdateInterval
		running: true
		repeat: true
		onTriggered: {
			fileMeminfo.reload();
			fileStat.reload();
			fileCpuThermal.reload();
			fileCpuInfo.reload();

			const textMeminfo = fileMeminfo.text();
			memoryTotal = Number(textMeminfo.match(/MemTotal:\s*(\d+)/)[1] ?? 1);
			memoryFree = Number(textMeminfo.match(/MemAvailable:\s*(\d+)/)[1] ?? 0);
			memoryUsed = memoryTotal - memoryFree;
			memoryUsedPercentage = memoryUsed / memoryTotal;
			swapTotal = Number(textMeminfo.match(/SwapTotal:\s*(\d+)/)[1] ?? 1);
			swapFree = Number(textMeminfo.match(/SwapFree:\s*(\d+)/)[1] ?? 0);

			const textStat = fileStat.text();
			const cpuLine = textStat.match(/^cpu\s+(\d+)\s+(\d+)\s+(\d+)\s+(\d+)\s+(\d+)\s+(\d+)\s+(\d+)/);
			if (cpuLine) {
				const stats = cpuLine.slice(1).map(Number);
				const total = stats.reduce((a, b) => a + b, 0);
				const idle = stats[3];
				if (root.previousCpuStats) {
					const td = total - root.previousCpuStats.total;
					const id = idle - root.previousCpuStats.idle;
					cpuUsage = td > 0 ? (1 - id / td) : 0;
				}
				root.previousCpuStats = {
					total,
					idle
				};
			}

			const cpuTempText = fileCpuThermal.text();
			cpuTemp = cpuTempText ? parseInt(cpuTempText.trim()) / 100000 : 0;

			const textCpuInfo = fileCpuInfo.text();
			let sum = 0, cnt = 0;
			const re = /^cpu MHz\s*:\s*([\d.]+)/mg;
			let m;
			while ((m = re.exec(textCpuInfo)) !== null) {
				sum += Number(m[1]);
				cnt++;
			}
			cpuFreq = cnt ? sum / cnt : 0;

			gpuUsageProc.running = true;
			gpuTempProc.running = true;
			interval = General.resourceUpdateInterval * cpuUsage > 0.7 || memoryUsedPercentage > 0.7 || cpuTemp > 0.7 ? 100 : 1000;
		}
	}

	FileView {
		id: fileMeminfo
		path: "/proc/meminfo"
	}
	FileView {
		id: fileStat
		path: "/proc/stat"
	}
	FileView {
		id: fileCpuThermal
		path: General.cpuThermalPath
	}
	FileView {
		id: fileCpuInfo
		path: "/proc/cpuinfo"
	}

	Process {
		id: gpuUsageProc
		running: true
		command: ["nvidia-smi", "--query-gpu=utilization.gpu", "--format=csv,noheader,nounits"]
		stdout: StdioCollector {
			onStreamFinished: {
				root.gpuUsage = parseInt(this.text.trim());
			}
		}
	}
	Process {
		id: gpuTempProc
		running: true
		command: ["nvidia-smi", "--query-gpu=temperature.gpu", "--format=csv,noheader,nounits"]
		stdout: StdioCollector {
			onStreamFinished: {
				root.gpuTemp = parseInt(this.text.trim());
			}
		}
	}
}