package netcfg

import (
	"strings"
	"testing"

	"gitea.apointless.space/bsncubed/ipswap/internal/preset"
)

func staticPreset() preset.Preset {
	return preset.Preset{
		ID:      "test",
		Name:    "Artist frame — control",
		Adapter: "Ethernet",
		Mode:    preset.ModeStatic,
		Primary: &preset.Address{
			Address: "192.168.42.100",
			Prefix:  24,
			Gateway: "192.168.42.1",
		},
		Secondary: []preset.Address{{Address: "10.0.10.50", Prefix: 24}},
		DNS:       preset.DNS{Mode: preset.ModeStatic, Servers: []string{"192.168.42.1", "1.1.1.1"}},
	}
}

func staticLive() LiveConfig {
	return LiveConfig{
		Adapter:   "Ethernet",
		Addresses: []preset.Address{{Address: "192.168.1.87", Prefix: 24}, {Address: "172.16.0.5", Prefix: 16}},
		Gateways:  []string{"192.168.1.1"},
		DNS:       []string{"192.168.1.1"},
	}
}

// The leak this guards against is the reason Plan exists: without a delete for
// every live address, secondaries from the previous preset stay attached.
func TestPlanDeletesEveryExistingAddress(t *testing.T) {
	cmds := Plan(staticPreset(), staticLive())

	var deletes []string
	for _, c := range cmds {
		if len(c.Args) > 3 && c.Args[2] == "delete" && c.Args[3] == "address" {
			deletes = append(deletes, strings.Join(c.Args, " "))
		}
	}
	if len(deletes) != 2 {
		t.Fatalf("expected 2 delete commands, got %d: %v", len(deletes), deletes)
	}
	for _, want := range []string{"addr=192.168.1.87", "addr=172.16.0.5"} {
		found := false
		for _, d := range deletes {
			if strings.Contains(d, want) {
				found = true
			}
		}
		if !found {
			t.Errorf("no delete command for %s: %v", want, deletes)
		}
	}
}

func TestPlanOrdering(t *testing.T) {
	cmds := Plan(staticPreset(), staticLive())

	// deletes, then set primary, then add secondary, then DNS.
	var kinds []string
	for _, c := range cmds {
		switch {
		case c.Args[2] == "delete":
			kinds = append(kinds, "delete")
		case c.Args[2] == "set" && c.Args[3] == "address":
			kinds = append(kinds, "set-addr")
		case c.Args[2] == "add" && c.Args[3] == "address":
			kinds = append(kinds, "add-addr")
		case c.Args[3] == "dnsservers":
			kinds = append(kinds, "dns")
		}
	}
	want := []string{"delete", "delete", "set-addr", "add-addr", "dns", "dns"}
	if strings.Join(kinds, ",") != strings.Join(want, ",") {
		t.Errorf("plan order = %v, want %v", kinds, want)
	}
}

func TestPlanUsesDottedMaskNotPrefix(t *testing.T) {
	// netsh rejects "/24" outright.
	cmds := Plan(staticPreset(), staticLive())
	for _, c := range cmds {
		for _, a := range c.Args {
			if strings.HasPrefix(a, "/") {
				t.Errorf("command passes a prefix-notation mask: %v", c.Args)
			}
		}
	}
	joined := strings.Join(cmds[2].Args, " ")
	if !strings.Contains(joined, "255.255.255.0") {
		t.Errorf("set address command lacks a dotted mask: %s", joined)
	}
}

func TestPlanDHCPSkipsDeletes(t *testing.T) {
	p := preset.Preset{
		ID: "d", Name: "DHCP", Adapter: "Ethernet",
		Mode: preset.ModeDHCP,
		DNS:  preset.DNS{Mode: preset.ModeDHCP},
	}
	cmds := Plan(p, staticLive())
	if len(cmds) != 2 {
		t.Fatalf("expected 2 commands for a DHCP preset, got %d: %v", len(cmds), cmds)
	}
	for _, c := range cmds {
		if c.Args[2] == "delete" {
			t.Errorf("DHCP plan should not delete addresses: %v", c.Args)
		}
	}
}

// A DHCP lease is not deletable with `netsh delete address`, and the static set
// replaces it anyway, so a live-DHCP adapter gets no delete commands.
func TestPlanSkipsDeletesWhenLiveIsDHCP(t *testing.T) {
	live := staticLive()
	live.DHCP = true
	for _, c := range Plan(staticPreset(), live) {
		if c.Args[2] == "delete" {
			t.Errorf("should not delete DHCP-assigned addresses: %v", c.Args)
		}
	}
}

func TestPlanAdapterNameIsNotShellQuoted(t *testing.T) {
	p := staticPreset()
	p.Adapter = "Ethernet 3"
	for _, c := range Plan(p, LiveConfig{Adapter: "Ethernet 3"}) {
		for _, a := range c.Args {
			if strings.HasPrefix(a, "name=") && strings.Contains(a, `"`) {
				t.Errorf("adapter name should not carry quotes through os/exec: %q", a)
			}
		}
	}
}

func TestMatches(t *testing.T) {
	p := staticPreset()
	live := LiveConfig{
		Adapter:   "Ethernet",
		Addresses: []preset.Address{{Address: "10.0.10.50", Prefix: 24}, {Address: "192.168.42.100", Prefix: 24}},
		Gateways:  []string{"192.168.42.1"},
		DNS:       []string{"192.168.42.1", "1.1.1.1"},
	}
	if !Matches(p, live) {
		t.Error("preset should match an adapter carrying exactly its addresses")
	}

	extra := live
	extra.Addresses = append(append([]preset.Address{}, live.Addresses...), preset.Address{Address: "10.9.9.9", Prefix: 24})
	if Matches(p, extra) {
		t.Error("a preset that is a subset of the live config is not the active preset")
	}

	reordered := live
	reordered.DNS = []string{"1.1.1.1", "192.168.42.1"}
	if Matches(p, reordered) {
		t.Error("DNS order is significant and should not match")
	}

	dhcp := live
	dhcp.DNSFromDHCP = true
	if Matches(p, dhcp) {
		t.Error("static-DNS preset should not match a DHCP-DNS adapter")
	}
}

func TestConfirmTextShapes(t *testing.T) {
	got := ConfirmText(staticPreset(), staticLive())
	for _, want := range []string{
		`Apply preset "Artist frame — control" to adapter "Ethernet"?`,
		"CURRENT", "NEW",
		"192.168.1.87/24",
		"192.168.42.100/24",
		"+ 10.0.10.50/24",
		"Gateway: 192.168.42.1",
		"DNS: 192.168.42.1, 1.1.1.1",
	} {
		if !strings.Contains(got, want) {
			t.Errorf("confirm text missing %q:\n%s", want, got)
		}
	}
}