package cli

import (
	"bytes"
	"os"
	"path/filepath"
	"reflect"
	"strings"
	"testing"

	"banger/internal/api"
	"banger/internal/model"
)

func TestNewBangerCommandHasExpectedSubcommands(t *testing.T) {
	cmd := NewBangerCommand()
	names := []string{}
	for _, sub := range cmd.Commands() {
		names = append(names, sub.Name())
	}
	want := []string{"daemon", "image", "tui", "vm"}
	if !reflect.DeepEqual(names, want) {
		t.Fatalf("subcommands = %v, want %v", names, want)
	}
}

func TestVMCreateFlagsExist(t *testing.T) {
	root := NewBangerCommand()
	vm, _, err := root.Find([]string{"vm"})
	if err != nil {
		t.Fatalf("find vm: %v", err)
	}
	create, _, err := vm.Find([]string{"create"})
	if err != nil {
		t.Fatalf("find create: %v", err)
	}
	for _, flagName := range []string{"name", "image", "vcpu", "memory", "system-overlay-size", "disk-size", "nat", "no-start"} {
		if create.Flags().Lookup(flagName) == nil {
			t.Fatalf("missing flag %q", flagName)
		}
	}
}

func TestVMKillFlagsExist(t *testing.T) {
	root := NewBangerCommand()
	vm, _, err := root.Find([]string{"vm"})
	if err != nil {
		t.Fatalf("find vm: %v", err)
	}
	kill, _, err := vm.Find([]string{"kill"})
	if err != nil {
		t.Fatalf("find kill: %v", err)
	}
	if kill.Flags().Lookup("signal") == nil {
		t.Fatal("missing signal flag")
	}
}

func TestVMSetParamsFromFlags(t *testing.T) {
	params, err := vmSetParamsFromFlags("devbox", 4, 2048, "16G", true, false)
	if err != nil {
		t.Fatalf("vmSetParamsFromFlags: %v", err)
	}
	if params.IDOrName != "devbox" || params.VCPUCount == nil || *params.VCPUCount != 4 {
		t.Fatalf("unexpected params: %+v", params)
	}
	if params.MemoryMiB == nil || *params.MemoryMiB != 2048 {
		t.Fatalf("unexpected memory: %+v", params)
	}
	if params.WorkDiskSize != "16G" {
		t.Fatalf("unexpected disk size: %+v", params)
	}
	if params.NATEnabled == nil || !*params.NATEnabled {
		t.Fatalf("unexpected nat value: %+v", params)
	}
}

func TestVMCreateParamsFromFlagsUsesNilForOmittedCPUAndMemory(t *testing.T) {
	cmd := NewBangerCommand()
	vm, _, err := cmd.Find([]string{"vm"})
	if err != nil {
		t.Fatalf("find vm: %v", err)
	}
	create, _, err := vm.Find([]string{"create"})
	if err != nil {
		t.Fatalf("find create: %v", err)
	}

	params, err := vmCreateParamsFromFlags(create, "devbox", "default", 0, 0, "8G", "16G", false, false)
	if err != nil {
		t.Fatalf("vmCreateParamsFromFlags: %v", err)
	}
	if params.VCPUCount != nil || params.MemoryMiB != nil {
		t.Fatalf("expected omitted cpu/memory to stay nil: %+v", params)
	}
}

func TestVMCreateParamsFromFlagsRejectsNonPositiveCPUAndMemory(t *testing.T) {
	cmd := NewBangerCommand()
	vm, _, err := cmd.Find([]string{"vm"})
	if err != nil {
		t.Fatalf("find vm: %v", err)
	}
	create, _, err := vm.Find([]string{"create"})
	if err != nil {
		t.Fatalf("find create: %v", err)
	}
	if err := create.Flags().Set("vcpu", "0"); err != nil {
		t.Fatalf("set vcpu flag: %v", err)
	}
	if _, err := vmCreateParamsFromFlags(create, "devbox", "default", 0, 0, "", "", false, false); err == nil || !strings.Contains(err.Error(), "vcpu must be a positive integer") {
		t.Fatalf("vmCreateParamsFromFlags(vcpu=0) error = %v", err)
	}
	if err := create.Flags().Set("memory", "-1"); err != nil {
		t.Fatalf("set memory flag: %v", err)
	}
	if _, err := vmCreateParamsFromFlags(create, "devbox", "default", 1, -1, "", "", false, false); err == nil || !strings.Contains(err.Error(), "memory must be a positive integer") {
		t.Fatalf("vmCreateParamsFromFlags(memory=-1) error = %v", err)
	}
}

func TestVMSetParamsFromFlagsConflict(t *testing.T) {
	if _, err := vmSetParamsFromFlags("devbox", -1, -1, "", true, true); err == nil {
		t.Fatal("expected nat conflict error")
	}
}

func TestVMSetParamsFromFlagsRejectsNonPositiveCPUAndMemory(t *testing.T) {
	if _, err := vmSetParamsFromFlags("devbox", 0, -1, "", false, false); err == nil || !strings.Contains(err.Error(), "vcpu must be a positive integer") {
		t.Fatalf("vmSetParamsFromFlags(vcpu=0) error = %v", err)
	}
	if _, err := vmSetParamsFromFlags("devbox", -1, 0, "", false, false); err == nil || !strings.Contains(err.Error(), "memory must be a positive integer") {
		t.Fatalf("vmSetParamsFromFlags(memory=0) error = %v", err)
	}
}

func TestSSHCommandArgs(t *testing.T) {
	args, err := sshCommandArgs(model.DaemonConfig{SSHKeyPath: "/bundle/id_ed25519"}, "172.16.0.2", []string{"--", "uname", "-a"})
	if err != nil {
		t.Fatalf("sshCommandArgs: %v", err)
	}
	want := []string{
		"-i", "/bundle/id_ed25519",
		"-o", "StrictHostKeyChecking=no",
		"-o", "UserKnownHostsFile=/dev/null",
		"root@172.16.0.2",
		"--", "uname", "-a",
	}
	if !reflect.DeepEqual(args, want) {
		t.Fatalf("args = %v, want %v", args, want)
	}
}

func TestValidateSSHPrereqs(t *testing.T) {
	dir := t.TempDir()
	keyPath := filepath.Join(dir, "id_ed25519")
	if err := os.WriteFile(keyPath, []byte("key"), 0o600); err != nil {
		t.Fatalf("write key: %v", err)
	}

	if err := validateSSHPrereqs(model.DaemonConfig{SSHKeyPath: keyPath}); err != nil {
		t.Fatalf("validateSSHPrereqs: %v", err)
	}
}

func TestValidateSSHPrereqsFailsForMissingKey(t *testing.T) {
	err := validateSSHPrereqs(model.DaemonConfig{SSHKeyPath: "/does/not/exist"})
	if err == nil || !strings.Contains(err.Error(), "ssh private key") {
		t.Fatalf("validateSSHPrereqs() error = %v, want missing key", err)
	}
}

func TestNewBangerdCommandRejectsArgs(t *testing.T) {
	cmd := NewBangerdCommand()
	cmd.SetArgs([]string{"extra"})
	if err := cmd.Execute(); err == nil {
		t.Fatal("expected extra args to be rejected")
	}
}

func TestDaemonOutdated(t *testing.T) {
	dir := t.TempDir()
	current := filepath.Join(dir, "bangerd-current")
	same := filepath.Join(dir, "bangerd-same")
	stale := filepath.Join(dir, "bangerd-stale")
	if err := os.WriteFile(current, []byte("current"), 0o755); err != nil {
		t.Fatalf("write current: %v", err)
	}
	if err := os.Link(current, same); err != nil {
		t.Fatalf("hard link: %v", err)
	}
	if err := os.WriteFile(stale, []byte("stale"), 0o755); err != nil {
		t.Fatalf("write stale: %v", err)
	}

	origBangerdPath := bangerdPathFunc
	origDaemonExePath := daemonExePath
	t.Cleanup(func() {
		bangerdPathFunc = origBangerdPath
		daemonExePath = origDaemonExePath
	})

	bangerdPathFunc = func() (string, error) {
		return current, nil
	}
	daemonExePath = func(pid int) string {
		if pid == 1 {
			return same
		}
		return stale
	}

	if daemonOutdated(1) {
		t.Fatal("expected matching daemon executable to be current")
	}
	if !daemonOutdated(2) {
		t.Fatal("expected replaced daemon executable to be outdated")
	}
}

func TestDaemonStatusIncludesLogPathWhenStopped(t *testing.T) {
	configHome := filepath.Join(t.TempDir(), "config")
	stateHome := filepath.Join(t.TempDir(), "state")
	runtimeHome := filepath.Join(t.TempDir(), "runtime")
	t.Setenv("XDG_CONFIG_HOME", configHome)
	t.Setenv("XDG_STATE_HOME", stateHome)
	t.Setenv("XDG_RUNTIME_DIR", runtimeHome)

	cmd := NewBangerCommand()
	var stdout bytes.Buffer
	cmd.SetOut(&stdout)
	cmd.SetErr(&stdout)
	cmd.SetArgs([]string{"daemon", "status"})
	if err := cmd.Execute(); err != nil {
		t.Fatalf("Execute: %v", err)
	}

	output := stdout.String()
	if !strings.Contains(output, "stopped\n") {
		t.Fatalf("output = %q, want stopped status", output)
	}
	if !strings.Contains(output, "log: "+filepath.Join(stateHome, "banger", "bangerd.log")) {
		t.Fatalf("output = %q, want daemon log path", output)
	}
}

func TestAbsolutizeImageBuildPaths(t *testing.T) {
	dir := t.TempDir()
	prev, err := os.Getwd()
	if err != nil {
		t.Fatalf("getwd: %v", err)
	}
	if err := os.Chdir(dir); err != nil {
		t.Fatalf("chdir: %v", err)
	}
	t.Cleanup(func() {
		_ = os.Chdir(prev)
	})

	params := api.ImageBuildParams{
		BaseRootfs: "images/base.ext4",
		KernelPath: "/kernel",
		InitrdPath: "boot/initrd.img",
		ModulesDir: "modules",
	}
	if err := absolutizeImageBuildPaths(&params); err != nil {
		t.Fatalf("absolutizeImageBuildPaths: %v", err)
	}

	want := api.ImageBuildParams{
		BaseRootfs: filepath.Join(dir, "images/base.ext4"),
		KernelPath: "/kernel",
		InitrdPath: filepath.Join(dir, "boot/initrd.img"),
		ModulesDir: filepath.Join(dir, "modules"),
	}
	if !reflect.DeepEqual(params, want) {
		t.Fatalf("params = %+v, want %+v", params, want)
	}
}