//go:build windows

package collector

import (
	"syscall"
	"testing"
)

// TestWindowsMemoryInfoFromStatus verifies Windows memory counters are exposed in bytes.
func TestWindowsMemoryInfoFromStatus(t *testing.T) {
	got := windowsMemoryInfoFromStatus(windowsMemoryStatus{
		TotalPhys: 10,
		AvailPhys: 4,
	})

	if got.Unit != "byte" {
		t.Fatalf("unit = %q, want byte", got.Unit)
	}
	if got.Total != 10 || got.Available != 4 || got.Free != 4 || got.Used != 6 {
		t.Fatalf("memory = %+v", got)
	}
	if got.UsedPercent != 60 {
		t.Fatalf("used percent = %f, want 60", got.UsedPercent)
	}
}

// TestWindowsTCPPortFromNetworkOrder verifies Windows TCP port values are decoded.
func TestWindowsTCPPortFromNetworkOrder(t *testing.T) {
	if got := windowsTCPPortFromNetworkOrder(0x0000901f); got != 8080 {
		t.Fatalf("port = %d, want 8080", got)
	}
}

// TestWindowsDiskInfoFromSpace verifies Windows disk counters are mapped to API disk fields.
func TestWindowsDiskInfoFromSpace(t *testing.T) {
	got := windowsDiskInfoFromSpace(`C:\`, windowsDriveFixed, 100, 40)

	if got.Device != `C:\` || got.MountPoint != `C:\` {
		t.Fatalf("disk paths = %q/%q", got.Device, got.MountPoint)
	}
	if got.FSType != "fixed" || got.Unit != "byte" {
		t.Fatalf("disk type/unit = %q/%q", got.FSType, got.Unit)
	}
	if got.Total != 100 || got.Free != 40 || got.Used != 60 {
		t.Fatalf("disk capacity = %+v", got)
	}
	if got.UsedPercent != 60 {
		t.Fatalf("used percent = %f, want 60", got.UsedPercent)
	}
}

// TestWindowsCPUUsagePercent verifies idle and kernel counters are converted to busy percentage.
func TestWindowsCPUUsagePercent(t *testing.T) {
	prev := windowsSystemTimes{Idle: 100, Kernel: 500, User: 500}
	next := windowsSystemTimes{Idle: 150, Kernel: 650, User: 700}

	got := windowsCPUUsagePercent(prev, next)

	if got != 75 {
		t.Fatalf("cpu usage = %f, want 75", got)
	}
}

// TestWindowsProcessInfoFromEntry verifies Toolhelp process data is enriched with memory and command line data.
func TestWindowsProcessInfoFromEntry(t *testing.T) {
	entry := syscall.ProcessEntry32{ProcessID: 123, ParentProcessID: 12}
	copy(entry.ExeFile[:], syscall.StringToUTF16("agent.exe"))

	got := windowsProcessInfoFromEntry(entry, windowsProcessDetails{
		Exe:       `C:\agent\agent.exe`,
		Cmdline:   `"C:\agent\agent.exe" run`,
		Username:  `NT AUTHORITY\SYSTEM`,
		MemoryRSS: 2048,
		MemoryVMS: 4096,
	})

	if got.PID != 123 || got.PPID != 12 || got.Name != "agent.exe" {
		t.Fatalf("process identity = %+v", got)
	}
	if got.Exe != `C:\agent\agent.exe` || got.Cmdline != `"C:\agent\agent.exe" run` {
		t.Fatalf("process command fields = %+v", got)
	}
	if got.Username != `NT AUTHORITY\SYSTEM` || got.MemoryRSS != 2048 || got.MemoryVMS != 4096 {
		t.Fatalf("process details = %+v", got)
	}
}