package edgecmd

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

	"gopkg.in/yaml.v3"

	"iop/packages/go/config"
)

const minimalEdgeYAML = "server:\n  listen: \"0.0.0.0:9090\"\n"

func writeMinimalEdgeYAML(t *testing.T, path string) {
	t.Helper()
	if err := os.WriteFile(path, []byte(minimalEdgeYAML), 0o600); err != nil {
		t.Fatalf("write %s: %v", path, err)
	}
}

func TestEnvCmdMarksAutoAdvertiseHostAndOfflineStateForEmptyConfig(t *testing.T) {
	dir := t.TempDir()
	cfgPath := filepath.Join(dir, "edge.yaml")
	writeMinimalEdgeYAML(t, cfgPath)

	root := NewRoot(Options{})
	var out bytes.Buffer
	root.SetOut(&out)
	root.SetErr(&out)
	root.SetArgs([]string{"env", "--config", cfgPath})
	if err := root.Execute(); err != nil {
		t.Fatalf("execute: %v\n%s", err, out.String())
	}

	got := out.String()
	if !strings.Contains(got, "advertise_host: ") || !strings.Contains(got, " (auto)") {
		t.Errorf("expected advertise_host with (auto) source, got:\n%s", got)
	}
	expectedArtifact := "artifact_base_url: " + defaultArtifactBaseURL(resolveAdvertiseHost("").Host) + " (derived)"
	if !strings.Contains(got, expectedArtifact) {
		t.Errorf("expected derived artifact_base_url %q, got:\n%s", expectedArtifact, got)
	}
	expectedBootstrap := "node_bootstrap: " + universalBootstrapScriptURL(defaultArtifactBaseURL(resolveAdvertiseHost("").Host))
	if !strings.Contains(got, expectedBootstrap) {
		t.Errorf("expected node_bootstrap %q, got:\n%s", expectedBootstrap, got)
	}
	if !strings.Contains(got, "openai_url: (disabled)") {
		t.Errorf("expected openai_url (disabled), got:\n%s", got)
	}
	if !strings.Contains(got, "configured_nodes: 0 (none)") {
		t.Errorf("expected configured_nodes 0 (none), got:\n%s", got)
	}
	if !strings.Contains(got, "connected_nodes: offline") {
		t.Errorf("expected connected_nodes offline placeholder, got:\n%s", got)
	}
}

func TestResolveEdgeLogPathFallsBackToBinaryDirLogsEdgeLog(t *testing.T) {
	got, err := ResolveEdgeLogPath("")
	if err != nil {
		t.Fatalf("ResolveEdgeLogPath: %v", err)
	}
	want := filepath.Join(binaryDir(), "logs", "edge.log")
	if got != want {
		t.Fatalf("ResolveEdgeLogPath empty: got %q, want %q", got, want)
	}
}

func TestResolveEdgeLogPathRespectsExplicitPath(t *testing.T) {
	explicit := filepath.Join(t.TempDir(), "custom.log")
	got, err := ResolveEdgeLogPath(explicit)
	if err != nil {
		t.Fatalf("ResolveEdgeLogPath: %v", err)
	}
	if got != explicit {
		t.Fatalf("ResolveEdgeLogPath explicit: got %q, want %q", got, explicit)
	}
}

func TestResolveAdvertiseHostPrefersExplicit(t *testing.T) {
	got := resolveAdvertiseHost("explicit.example.test")
	if got.Host != "explicit.example.test" || got.Source != "explicit" {
		t.Fatalf("explicit advertise: got %+v", got)
	}
}

func TestResolveAdvertiseHostFallsBackToAuto(t *testing.T) {
	got := resolveAdvertiseHost("")
	if got.Host == "" {
		t.Fatal("auto advertise host empty")
	}
	if got.Source != "auto" {
		t.Fatalf("expected auto source, got %q", got.Source)
	}
}

func TestAddressForCombinesAdvertiseHostWithListenPort(t *testing.T) {
	if got := addressFor("10.0.0.1", "0.0.0.0:9090"); got != "10.0.0.1:9090" {
		t.Errorf("addressFor: got %q", got)
	}
	if got := addressFor("host", ""); got != "" {
		t.Errorf("addressFor empty listen: got %q", got)
	}
}

func TestNodeRegisterUpsertsYAMLAndOutputsBootstrap(t *testing.T) {
	origGen := tokenGenerator
	defer func() { tokenGenerator = origGen }()
	tokenGenerator = func() string {
		return "mocked-token-1234"
	}

	dir := t.TempDir()
	cfgPath := filepath.Join(dir, "edge.yaml")
	writeMinimalEdgeYAML(t, cfgPath)

	root := NewRoot(Options{})
	var out bytes.Buffer
	root.SetOut(&out)
	root.SetErr(&out)
	root.SetArgs([]string{"--config", cfgPath, "node", "register", "node-a", "--alias", "alias-a"})
	if err := root.Execute(); err != nil {
		t.Fatalf("execute register node-a: %v\n%s", err, out.String())
	}

	output := out.String()
	expectedCmd := "curl -fsSL " + universalBootstrapScriptURL(defaultArtifactBaseURL(resolveAdvertiseHost("").Host)) + " | bash -s mocked-token-1234"
	if strings.TrimSpace(output) != expectedCmd {
		t.Errorf("expected only bootstrap command %q, got %q", expectedCmd, output)
	}

	data, err := os.ReadFile(cfgPath)
	if err != nil {
		t.Fatalf("read persisted config: %v", err)
	}
	var cfg config.EdgeConfig
	if err := yaml.Unmarshal(data, &cfg); err != nil {
		t.Fatalf("unmarshal config: %v", err)
	}

	if len(cfg.Nodes) != 1 {
		t.Fatalf("expected exactly 1 node, got %d", len(cfg.Nodes))
	}
	if cfg.Nodes[0].ID != "node-a" || cfg.Nodes[0].Alias != "alias-a" || cfg.Nodes[0].Token != "mocked-token-1234" {
		t.Fatalf("unexpected node state in YAML: %+v", cfg.Nodes[0])
	}

	root = NewRoot(Options{})
	out.Reset()
	root.SetOut(&out)
	root.SetErr(&out)
	root.SetArgs([]string{"--config", cfgPath, "node", "register", "node-a", "--token", "explicit-token-abc", "--adapter", "ollama", "--ollama-base-url", "http://ollama-host:11434"})
	if err := root.Execute(); err != nil {
		t.Fatalf("execute update node-a: %v\n%s", err, out.String())
	}

	output = out.String()
	expectedCmd2 := "curl -fsSL " + universalBootstrapScriptURL(defaultArtifactBaseURL(resolveAdvertiseHost("").Host)) + " | bash -s explicit-token-abc"
	if strings.TrimSpace(output) != expectedCmd2 {
		t.Errorf("expected only bootstrap command %q, got %q", expectedCmd2, output)
	}

	data, err = os.ReadFile(cfgPath)
	if err != nil {
		t.Fatalf("read persisted config: %v", err)
	}
	if err := yaml.Unmarshal(data, &cfg); err != nil {
		t.Fatalf("unmarshal config: %v", err)
	}

	if len(cfg.Nodes) != 1 {
		t.Fatalf("expected exactly 1 node, got %d", len(cfg.Nodes))
	}
	if cfg.Nodes[0].Token != "explicit-token-abc" || !cfg.Nodes[0].Adapters.Ollama.Enabled || cfg.Nodes[0].Adapters.Ollama.BaseURL != "http://ollama-host:11434" {
		t.Fatalf("unexpected node state after explicit token update: %+v", cfg.Nodes[0])
	}
}

func TestPatchYAMLPreservesArtifactBootstrapField(t *testing.T) {
	origYAML := `server:
  listen: "0.0.0.0:9090"
bootstrap:
  artifact_base_url: "http://old.example.com/artifacts"
`
	cfg := &config.EdgeConfig{
		Bootstrap: config.EdgeBootstrapConf{
			ArtifactBaseURL: "http://example.com/artifacts",
		},
	}

	patched, err := patchYAML([]byte(origYAML), cfg)
	if err != nil {
		t.Fatalf("patchYAML: %v", err)
	}

	var doc struct {
		Server struct {
			Listen string `yaml:"listen"`
		} `yaml:"server"`
		Bootstrap struct {
			ArtifactBaseURL string `yaml:"artifact_base_url"`
		} `yaml:"bootstrap"`
	}

	if err := yaml.Unmarshal(patched, &doc); err != nil {
		t.Fatalf("unmarshal patched: %v", err)
	}

	if doc.Server.Listen != "0.0.0.0:9090" {
		t.Errorf("server.listen was modified: %q", doc.Server.Listen)
	}
	if doc.Bootstrap.ArtifactBaseURL != "http://example.com/artifacts" {
		t.Errorf("artifact_base_url = %q", doc.Bootstrap.ArtifactBaseURL)
	}
}

func TestValidateEdgeConfig_VllmLegacyEmptyEndpointRejected(t *testing.T) {
	cfg := &config.EdgeConfig{
		Nodes: []config.NodeDefinition{
			{
				ID:    "node-1",
				Alias: "test",
				Token: "tok",
				Adapters: config.AdaptersConf{
					Vllm: config.VllmConf{Enabled: true, Endpoint: ""},
				},
			},
		},
	}
	err := validateEdgeConfig(cfg)
	if err == nil {
		t.Fatal("expected error for enabled vllm with empty endpoint")
	}
}

func TestValidateEdgeConfig_VllmInstanceEmptyEndpointRejected(t *testing.T) {
	cfg := &config.EdgeConfig{
		Nodes: []config.NodeDefinition{
			{
				ID:    "node-1",
				Alias: "test",
				Token: "tok",
				Adapters: config.AdaptersConf{
					VllmInstances: []config.VllmInstanceConf{
						{Name: "a100", Enabled: true, Endpoint: ""},
					},
				},
			},
		},
	}
	err := validateEdgeConfig(cfg)
	if err == nil {
		t.Fatal("expected error for enabled vllm instance with empty endpoint")
	}
}

func TestValidateEdgeConfig_AllAdaptersDisabledRejected(t *testing.T) {
	cfg := &config.EdgeConfig{
		Nodes: []config.NodeDefinition{
			{
				ID:    "node-1",
				Alias: "test",
				Token: "tok",
				Adapters: config.AdaptersConf{
					Ollama: config.OllamaConf{Enabled: false},
					Vllm:   config.VllmConf{Enabled: false},
					CLI:    config.CLIConf{Enabled: false},
					OllamaInstances: []config.OllamaInstanceConf{
						{Name: "off", Enabled: false, BaseURL: "http://127.0.0.1:11434"},
					},
					VllmInstances: []config.VllmInstanceConf{
						{Name: "off", Enabled: false, Endpoint: "http://10.0.0.5:8000"},
					},
				},
			},
		},
	}
	err := validateEdgeConfig(cfg)
	if err == nil {
		t.Fatal("expected error when all adapters are disabled")
	}
}

func TestValidateEdgeConfig_OllamaInstanceEnabledAccepted(t *testing.T) {
	cfg := &config.EdgeConfig{
		Nodes: []config.NodeDefinition{
			{
				ID:    "node-1",
				Alias: "test",
				Token: "tok",
				Adapters: config.AdaptersConf{
					OllamaInstances: []config.OllamaInstanceConf{
						{Name: "local", Enabled: true, BaseURL: "http://127.0.0.1:11434"},
					},
				},
			},
		},
	}
	if err := validateEdgeConfig(cfg); err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
}