package servicedef

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

func boolPtr(b bool) *bool { return &b }

func sampleDef() *ServiceDef {
	return &ServiceDef{
		Name:   "metacrypt",
		Node:   "rift",
		Active: boolPtr(true),
		Components: []ComponentDef{
			{
				Name:    "api",
				Image:   "mcr.svc.mcp.metacircular.net:8443/metacrypt:latest",
				Network: "docker_default",
				User:    "0:0",
				Restart: "unless-stopped",
				Ports:   []string{"127.0.0.1:18443:8443", "127.0.0.1:19443:9443"},
				Volumes: []string{"/srv/metacrypt:/srv/metacrypt"},
			},
			{
				Name:    "web",
				Image:   "mcr.svc.mcp.metacircular.net:8443/metacrypt-web:latest",
				Network: "docker_default",
				User:    "0:0",
				Restart: "unless-stopped",
				Ports:   []string{"127.0.0.1:18080:8080"},
				Volumes: []string{"/srv/metacrypt:/srv/metacrypt"},
				Cmd:     []string{"server", "--config", "/srv/metacrypt/metacrypt.toml"},
			},
		},
	}
}

// compareComponents asserts that two component slices are equal field by field.
func compareComponents(t *testing.T, prefix string, got, want []ComponentDef) {
	t.Helper()
	if len(got) != len(want) {
		t.Fatalf("%s components: got %d, want %d", prefix, len(got), len(want))
	}
	for i, wantC := range want {
		gotC := got[i]
		if gotC.Name != wantC.Name {
			t.Fatalf("%s component[%d] name: got %q, want %q", prefix, i, gotC.Name, wantC.Name)
		}
		if gotC.Image != wantC.Image {
			t.Fatalf("%s component[%d] image: got %q, want %q", prefix, i, gotC.Image, wantC.Image)
		}
		if gotC.Network != wantC.Network {
			t.Fatalf("%s component[%d] network: got %q, want %q", prefix, i, gotC.Network, wantC.Network)
		}
		if gotC.User != wantC.User {
			t.Fatalf("%s component[%d] user: got %q, want %q", prefix, i, gotC.User, wantC.User)
		}
		if gotC.Restart != wantC.Restart {
			t.Fatalf("%s component[%d] restart: got %q, want %q", prefix, i, gotC.Restart, wantC.Restart)
		}
		compareStrSlice(t, prefix, i, "ports", gotC.Ports, wantC.Ports)
		compareStrSlice(t, prefix, i, "volumes", gotC.Volumes, wantC.Volumes)
		compareStrSlice(t, prefix, i, "cmd", gotC.Cmd, wantC.Cmd)
	}
}

func compareStrSlice(t *testing.T, prefix string, idx int, field string, got, want []string) {
	t.Helper()
	if len(got) != len(want) {
		t.Fatalf("%s component[%d] %s: got %d, want %d", prefix, idx, field, len(got), len(want))
	}
	for j := range want {
		if got[j] != want[j] {
			t.Fatalf("%s component[%d] %s[%d]: got %q, want %q", prefix, idx, field, j, got[j], want[j])
		}
	}
}

func TestLoadWrite(t *testing.T) {
	def := sampleDef()
	dir := t.TempDir()
	path := filepath.Join(dir, "metacrypt.toml")

	if err := Write(path, def); err != nil {
		t.Fatalf("write: %v", err)
	}

	got, err := Load(path)
	if err != nil {
		t.Fatalf("load: %v", err)
	}

	if got.Name != def.Name {
		t.Fatalf("name: got %q, want %q", got.Name, def.Name)
	}
	if got.Node != def.Node {
		t.Fatalf("node: got %q, want %q", got.Node, def.Node)
	}
	if *got.Active != *def.Active {
		t.Fatalf("active: got %v, want %v", *got.Active, *def.Active)
	}
	compareComponents(t, "load-write", got.Components, def.Components)
}

func TestValidation(t *testing.T) {
	tests := []struct {
		name    string
		def     *ServiceDef
		wantErr string
	}{
		{
			name: "missing name",
			def: &ServiceDef{
				Node:       "rift",
				Components: []ComponentDef{{Name: "api", Image: "img:v1"}},
			},
			wantErr: "service name is required",
		},
		{
			name: "missing node",
			def: &ServiceDef{
				Name:       "svc",
				Components: []ComponentDef{{Name: "api", Image: "img:v1"}},
			},
			wantErr: "service node is required",
		},
		{
			name: "empty components",
			def: &ServiceDef{
				Name: "svc",
				Node: "rift",
			},
			wantErr: "must have at least one component",
		},
		{
			name: "duplicate component names",
			def: &ServiceDef{
				Name: "svc",
				Node: "rift",
				Components: []ComponentDef{
					{Name: "api", Image: "img:v1"},
					{Name: "api", Image: "img:v2"},
				},
			},
			wantErr: "duplicate component name",
		},
		{
			name: "component missing name",
			def: &ServiceDef{
				Name:       "svc",
				Node:       "rift",
				Components: []ComponentDef{{Image: "img:v1"}},
			},
			wantErr: "component name is required",
		},
		{
			name: "component missing image",
			def: &ServiceDef{
				Name:       "svc",
				Node:       "rift",
				Components: []ComponentDef{{Name: "api"}},
			},
			wantErr: "image is required",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			err := validate(tt.def)
			if err == nil {
				t.Fatal("expected validation error")
			}
			if got := err.Error(); !strings.Contains(got, tt.wantErr) {
				t.Fatalf("error %q does not contain %q", got, tt.wantErr)
			}
		})
	}
}

func TestLoadAll(t *testing.T) {
	dir := t.TempDir()

	// Write services in non-alphabetical order.
	defs := []*ServiceDef{
		{
			Name:       "mcr",
			Node:       "rift",
			Active:     boolPtr(true),
			Components: []ComponentDef{{Name: "api", Image: "mcr:latest"}},
		},
		{
			Name:       "metacrypt",
			Node:       "rift",
			Active:     boolPtr(true),
			Components: []ComponentDef{{Name: "api", Image: "metacrypt:latest"}},
		},
		{
			Name:       "mcias",
			Node:       "rift",
			Active:     boolPtr(false),
			Components: []ComponentDef{{Name: "api", Image: "mcias:latest"}},
		},
	}

	for _, d := range defs {
		if err := Write(filepath.Join(dir, d.Name+".toml"), d); err != nil {
			t.Fatalf("write %s: %v", d.Name, err)
		}
	}

	// Write a non-TOML file that should be ignored.
	if err := os.WriteFile(filepath.Join(dir, "README.md"), []byte("# ignore"), 0o600); err != nil {
		t.Fatalf("write readme: %v", err)
	}

	got, err := LoadAll(dir)
	if err != nil {
		t.Fatalf("load all: %v", err)
	}

	if len(got) != 3 {
		t.Fatalf("count: got %d, want 3", len(got))
	}

	wantOrder := []string{"mcias", "mcr", "metacrypt"}
	for i, name := range wantOrder {
		if got[i].Name != name {
			t.Fatalf("order[%d]: got %q, want %q", i, got[i].Name, name)
		}
	}
}

func TestActiveDefault(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "svc.toml")

	content := `name = "svc"
node = "rift"

[[components]]
name = "api"
image = "img:latest"
`
	if err := os.WriteFile(path, []byte(content), 0o600); err != nil {
		t.Fatalf("write: %v", err)
	}

	def, err := Load(path)
	if err != nil {
		t.Fatalf("load: %v", err)
	}

	if def.Active == nil {
		t.Fatal("active should not be nil")
	}
	if !*def.Active {
		t.Fatal("active should default to true")
	}
}

func TestProtoConversion(t *testing.T) {
	def := sampleDef()

	spec := ToProto(def)
	if spec.Name != def.Name {
		t.Fatalf("proto name: got %q, want %q", spec.Name, def.Name)
	}
	if !spec.Active {
		t.Fatal("proto active should be true")
	}
	if len(spec.Components) != len(def.Components) {
		t.Fatalf("proto components: got %d, want %d", len(spec.Components), len(def.Components))
	}

	got := FromProto(spec, def.Node)
	if got.Name != def.Name {
		t.Fatalf("round-trip name: got %q, want %q", got.Name, def.Name)
	}
	if got.Node != def.Node {
		t.Fatalf("round-trip node: got %q, want %q", got.Node, def.Node)
	}
	if *got.Active != *def.Active {
		t.Fatalf("round-trip active: got %v, want %v", *got.Active, *def.Active)
	}
	compareComponents(t, "round-trip", got.Components, def.Components)
}