package deploymentconfig

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

const validNativeConfig = `[backend]
type = "native"
release_dir = "/home/yms/lib/releases"
active_jar = "/home/yms/lib/glory-soft-yms.jar"
systemctl_path = "/bin/systemctl"

[backend.slot.8080]
unit = "yms-backend@8080.service"
jar = "/home/yms/lib/glory-soft-yms-8080.jar"
health_endpoint = "http://127.0.0.1:8080/yms/actuator/health"

[backend.slot.8081]
unit = "yms-backend@8081.service"
jar = "/home/yms/lib/glory-soft-yms-8081.jar"
health_endpoint = "http://127.0.0.1:8081/yms/actuator/health"
`

func TestLoadValidNativeConfiguration(t *testing.T) {
	path := writeConfig(t, validNativeConfig)

	config, err := Load(path)
	if err != nil {
		t.Fatalf("load native deployment configuration: %v", err)
	}
	if config.Backend.Type != BackendTypeNative || config.Backend.SystemctlPath != "/bin/systemctl" {
		t.Fatalf("unexpected backend configuration: %+v", config.Backend)
	}
	slot8080, err := config.Backend.SlotForPort(BackendPort8080)
	if err != nil {
		t.Fatalf("read 8080 slot: %v", err)
	}
	if slot8080.Unit != nativeUnit8080 || slot8080.JAR != nativeSlotJAR8080 || slot8080.HealthEndpoint != nativeHealthURL8080 {
		t.Fatalf("unexpected 8080 slot: %+v", slot8080)
	}
	slot8081, err := config.Backend.SlotForPort(BackendPort8081)
	if err != nil {
		t.Fatalf("read 8081 slot: %v", err)
	}
	if slot8081.Unit != nativeUnit8081 || slot8081.JAR != nativeSlotJAR8081 || slot8081.HealthEndpoint != nativeHealthURL8081 {
		t.Fatalf("unexpected 8081 slot: %+v", slot8081)
	}
}

func TestPackagedNativeConfigurationMatchesContract(t *testing.T) {
	path, err := filepath.Abs(filepath.Join("..", "..", "packaging", "etc", "yms-daemon", "yms-daemon.toml"))
	if err != nil {
		t.Fatalf("resolve packaged native deployment configuration: %v", err)
	}
	if _, err := Load(path); err != nil {
		t.Fatalf("load packaged native deployment configuration: %v", err)
	}
}

func TestLoadRejectsUnknownField(t *testing.T) {
	content := strings.Replace(validNativeConfig, "systemctl_path = \"/bin/systemctl\"", "systemctl_path = \"/bin/systemctl\"\nSystemctlPath = \"/usr/bin/systemctl\"", 1)
	_, err := Load(writeConfig(t, content))
	if err == nil || !strings.Contains(err.Error(), "SystemctlPath") {
		t.Fatalf("expected exact unknown field rejection, got %v", err)
	}
}

func TestLoadRejectsWrongTableCase(t *testing.T) {
	content := strings.Replace(validNativeConfig, "[backend]", "[Backend]", 1)
	_, err := Load(writeConfig(t, content))
	if err == nil || !strings.Contains(err.Error(), "Backend") {
		t.Fatalf("expected exact table case rejection, got %v", err)
	}
}

func TestLoadRejectsMissingNativeField(t *testing.T) {
	content := strings.Replace(validNativeConfig, "active_jar = \"/home/yms/lib/glory-soft-yms.jar\"\n", "", 1)
	_, err := Load(writeConfig(t, content))
	if err == nil || !strings.Contains(err.Error(), "backend.active_jar") {
		t.Fatalf("expected missing active JAR rejection, got %v", err)
	}
}

func TestLoadRejectsUnknownSlot(t *testing.T) {
	content := validNativeConfig + `
[backend.slot.9090]
unit = "yms-backend@9090.service"
jar = "/home/yms/lib/glory-soft-yms-9090.jar"
health_endpoint = "http://127.0.0.1:9090/yms/actuator/health"
`
	_, err := Load(writeConfig(t, content))
	if err == nil || !strings.Contains(err.Error(), "9090") {
		t.Fatalf("expected unknown slot rejection, got %v", err)
	}
}

func TestLoadRejectsChangedSlotEndpoint(t *testing.T) {
	content := strings.Replace(validNativeConfig, nativeHealthURL8080, nativeHealthURL8081, 1)
	_, err := Load(writeConfig(t, content))
	if err == nil || !strings.Contains(err.Error(), "backend.slot.8080.health_endpoint") {
		t.Fatalf("expected changed health endpoint rejection, got %v", err)
	}
}

func TestLoadAcceptsExplicitUsrBinSystemctlPath(t *testing.T) {
	content := strings.Replace(validNativeConfig, "/bin/systemctl", "/usr/bin/systemctl", 1)
	config, err := Load(writeConfig(t, content))
	if err != nil {
		t.Fatalf("load explicit /usr/bin/systemctl path: %v", err)
	}
	if config.Backend.SystemctlPath != "/usr/bin/systemctl" {
		t.Fatalf("unexpected systemctl path: %q", config.Backend.SystemctlPath)
	}
}

func TestLoadRejectsChangedBackendTypeCase(t *testing.T) {
	content := strings.Replace(validNativeConfig, `type = "native"`, `type = "Native"`, 1)
	_, err := Load(writeConfig(t, content))
	if err == nil || !strings.Contains(err.Error(), "backend.type") {
		t.Fatalf("expected exact backend type rejection, got %v", err)
	}
}

func TestLoadRejectsDuplicateField(t *testing.T) {
	content := strings.Replace(validNativeConfig, "type = \"native\"", "type = \"native\"\ntype = \"native\"", 1)
	_, err := Load(writeConfig(t, content))
	if err == nil {
		t.Fatal("expected duplicate field rejection")
	}
}

func TestLoadRequiresAbsoluteConfigurationPath(t *testing.T) {
	_, err := Load("yms-daemon.toml")
	if err == nil || !strings.Contains(err.Error(), "absolute path") {
		t.Fatalf("expected absolute configuration path rejection, got %v", err)
	}
}

func TestSlotForPortRejectsUnsupportedPort(t *testing.T) {
	config, err := Load(writeConfig(t, validNativeConfig))
	if err != nil {
		t.Fatalf("load native deployment configuration: %v", err)
	}
	if _, err := config.Backend.SlotForPort(9090); err == nil {
		t.Fatal("expected unsupported port rejection")
	}
}

func writeConfig(t *testing.T, content string) string {
	t.Helper()
	path := filepath.Join(t.TempDir(), "yms-daemon.toml")
	if err := os.WriteFile(path, []byte(content), 0o600); err != nil {
		t.Fatalf("write deployment configuration: %v", err)
	}
	return path
}