package kvm

import (
	"encoding/xml"
	"strings"
	"testing"
	"time"
)

func testDomainParams() domainParams {
	return domainParams{
		Name:      "proxy-abc123def456ghij",
		UID:       "11111111-2222-3333-4444-555555555555",
		CreatedAt: time.Date(2026, 9, 4, 12, 0, 0, 0, time.UTC),
		VCPUs:     2,
		MemoryMiB: 2048,
		Pool:      "default",
		Bridge:    "br0",
		DiskVol:   "proxy-abc123def456ghij.qcow2",
		SeedVol:   "proxy-abc123def456ghij-seed.iso",
	}
}

func TestBuildDomainXML_fieldByField(t *testing.T) {
	t.Parallel()
	raw, err := buildDomainXML(testDomainParams())
	if err != nil {
		t.Fatalf("buildDomainXML() error = %v", err)
	}
	var d domainXML
	if err := xml.Unmarshal([]byte(raw), &d); err != nil {
		t.Fatalf("output is not well-formed XML: %v\n%s", err, raw)
	}

	if d.Type != "kvm" || d.Name != "proxy-abc123def456ghij" {
		t.Errorf("type/name = %s/%s", d.Type, d.Name)
	}
	if d.VCPU != 2 || d.Memory.Value != 2048 || d.Memory.Unit != "MiB" {
		t.Errorf("vcpu/memory = %d/%d %s, want 2/2048 MiB", d.VCPU, d.Memory.Value, d.Memory.Unit)
	}
	if d.OS.Type.Value != "hvm" || d.OS.Type.Arch != "x86_64" || d.OS.Type.Machine != "q35" || d.OS.Boot.Dev != "hd" {
		t.Errorf("os = %+v", d.OS)
	}
	if d.Features.ACPI == nil || d.Features.APIC == nil {
		t.Errorf("features = %+v, want acpi and apic", d.Features)
	}
	if d.CPU.Mode != "host-passthrough" {
		t.Errorf("cpu mode = %q", d.CPU.Mode)
	}
	if d.OnPoweroff != "destroy" || d.OnReboot != "restart" || d.OnCrash != "destroy" {
		t.Errorf("lifecycle = %s/%s/%s", d.OnPoweroff, d.OnReboot, d.OnCrash)
	}

	m := d.Metadata.Instance
	if !m.managed() || m.UID != "11111111-2222-3333-4444-555555555555" || m.CreatedAt != "2026-09-04T12:00:00Z" {
		t.Errorf("metadata = %+v", m)
	}
	if !strings.Contains(raw, `xmlns="`+metadataURI+`"`) {
		t.Errorf("metadata element is not namespaced; libvirt rejects that:\n%s", raw)
	}

	if len(d.Devices.Disks) != 2 {
		t.Fatalf("disks = %d, want 2", len(d.Devices.Disks))
	}
	disk, seed := d.Devices.Disks[0], d.Devices.Disks[1]
	if disk.Type != "volume" || disk.Device != "disk" || disk.Driver.Type != "qcow2" ||
		disk.Source.Pool != "default" || disk.Source.Volume != "proxy-abc123def456ghij.qcow2" ||
		disk.Target.Dev != "vda" || disk.Target.Bus != "virtio" || disk.ReadOnly != nil {
		t.Errorf("overlay disk = %+v", disk)
	}
	if seed.Type != "volume" || seed.Device != "cdrom" || seed.Driver.Type != "raw" ||
		seed.Source.Pool != "default" || seed.Source.Volume != "proxy-abc123def456ghij-seed.iso" ||
		seed.Target.Bus != "sata" || seed.ReadOnly == nil {
		t.Errorf("seed cdrom = %+v", seed)
	}

	if len(d.Devices.Interfaces) != 1 {
		t.Fatalf("interfaces = %d, want 1", len(d.Devices.Interfaces))
	}
	if nic := d.Devices.Interfaces[0]; nic.Type != "bridge" || nic.Source.Bridge != "br0" || nic.Model.Type != "virtio" {
		t.Errorf("interface = %+v", nic)
	}

	if len(d.Devices.Channels) != 1 || d.Devices.Channels[0].Target.Name != guestAgentChannel || d.Devices.Channels[0].Target.Type != "virtio" {
		t.Errorf("channels = %+v, want one virtio %s channel", d.Devices.Channels, guestAgentChannel)
	}
	if len(d.Devices.Serials) != 1 || len(d.Devices.Consoles) != 1 || d.Devices.Consoles[0].Target.Type != "serial" {
		t.Errorf("serial/console = %+v/%+v", d.Devices.Serials, d.Devices.Consoles)
	}
	if d.Devices.RNG.Model != "virtio" || d.Devices.RNG.Backend.Value != "/dev/urandom" {
		t.Errorf("rng = %+v", d.Devices.RNG)
	}
	if strings.Contains(raw, "<graphics") {
		t.Errorf("domain has a graphics device; headless VMs must not:\n%s", raw)
	}
}

func TestBuildDomainXML_escapesUserValues(t *testing.T) {
	t.Parallel()
	p := testDomainParams()
	p.Bridge = `br0" onload="x`
	raw, err := buildDomainXML(p)
	if err != nil {
		t.Fatalf("buildDomainXML() error = %v", err)
	}
	var d domainXML
	if err := xml.Unmarshal([]byte(raw), &d); err != nil {
		t.Fatalf("output is not well-formed XML: %v", err)
	}
	if d.Devices.Interfaces[0].Source.Bridge != p.Bridge {
		t.Errorf("bridge = %q, want the raw value back", d.Devices.Interfaces[0].Source.Bridge)
	}
}