package deploymentconfig

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

// validNativeConfig 一份满足原生后端部署契约的示例 TOML 配置，供各测试用例共享。
const validNativeConfig = `[daemon]
environment = "dev"

[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"

[nodeSsr]
type = "container"

[nodeSsr.slot.18910]
container_name = "node-ssr-18910"
health_endpoint = "http://127.0.0.1:18910/health"

[nodeSsr.slot.28910]
container_name = "node-ssr-28910"
health_endpoint = "http://127.0.0.1:28910/health"
`

// validContainerConfig 一份满足容器后端部署契约的示例 TOML 配置，供各测试用例共享。
const validContainerConfig = `[daemon]
environment = "dev"

[backend]
type = "container"
systemctl_path = "/bin/systemctl"

[backend.slot.8080]
container_name = "backend-8080"
health_endpoint = "http://127.0.0.1:8080/yms/actuator/health"

[backend.slot.8081]
container_name = "backend-8081"
health_endpoint = "http://127.0.0.1:8081/yms/actuator/health"

[nodeSsr]
type = "container"

[nodeSsr.slot.18910]
container_name = "node-ssr-18910"
health_endpoint = "http://127.0.0.1:18910/health"

[nodeSsr.slot.28910]
container_name = "node-ssr-28910"
health_endpoint = "http://127.0.0.1:28910/health"
`

// TestLoadValidNativeConfiguration 验证合法原生配置能被完整加载，
// 且解析出的 daemon、backend 与 8080/8081 槽位取值都与契约常量精确一致。
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.Daemon.Environment != EnvironmentDev {
		t.Fatalf("unexpected daemon configuration: %+v", config.Daemon)
	}
	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)
	}
}

// TestLoadValidContainerConfiguration 验证合法容器配置能被加载，
// 且两个槽位的 container_name 取值与契约精确一致。
func TestLoadValidContainerConfiguration(t *testing.T) {
	config, err := Load(writeConfig(t, validContainerConfig))
	if err != nil {
		t.Fatalf("load container deployment configuration: %v", err)
	}
	if config.Backend.Type != BackendTypeContainer {
		t.Fatalf("unexpected backend type: %q", config.Backend.Type)
	}
	if config.Backend.Slot.Port8080.ContainerName != "backend-8080" || config.Backend.Slot.Port8081.ContainerName != "backend-8081" {
		t.Fatalf("unexpected container slots: %+v", config.Backend.Slot)
	}
}

// TestLoadAcceptsStopGraceSeconds 验证 backend.stop_grace_seconds 配置为合法正整数时
// 能被接受，并解析到 Backend.StopGraceSeconds。
func TestLoadAcceptsStopGraceSeconds(t *testing.T) {
	content := strings.Replace(validContainerConfig, "systemctl_path = \"/bin/systemctl\"", "systemctl_path = \"/bin/systemctl\"\nstop_grace_seconds = 45", 1)
	config, err := Load(writeConfig(t, content))
	if err != nil {
		t.Fatalf("load configuration with stop_grace_seconds: %v", err)
	}
	if config.Backend.StopGraceSeconds == nil || *config.Backend.StopGraceSeconds != 45 {
		t.Fatalf("unexpected stop_grace_seconds: %+v", config.Backend.StopGraceSeconds)
	}
}

// TestLoadRejectsNonPositiveStopGraceSeconds 验证 backend.stop_grace_seconds 配置为非正整数时被拒绝。
func TestLoadRejectsNonPositiveStopGraceSeconds(t *testing.T) {
	content := strings.Replace(validContainerConfig, "systemctl_path = \"/bin/systemctl\"", "systemctl_path = \"/bin/systemctl\"\nstop_grace_seconds = 0", 1)
	_, err := Load(writeConfig(t, content))
	if err == nil || !strings.Contains(err.Error(), "backend.stop_grace_seconds") {
		t.Fatalf("expected stop_grace_seconds rejection, got %v", err)
	}
}

// TestLoadRejectsChangedContainerName 验证容器槽位的 container_name 被篡改时会被拒绝，
// 且错误信息精确指向 backend.slot.8081.container_name 字段。
func TestLoadRejectsChangedContainerName(t *testing.T) {
	content := strings.Replace(validContainerConfig, `container_name = "backend-8081"`, `container_name = "backend"`, 1)
	_, err := Load(writeConfig(t, content))
	if err == nil || !strings.Contains(err.Error(), "backend.slot.8081.container_name") {
		t.Fatalf("expected exact container name rejection, got %v", err)
	}
}

// TestPackagedNativeConfigurationMatchesContract 验证随发行包打包的原生部署配置
// 与代码内置契约一致，确保打包产物不会被意外改坏。
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)
	}
}

// TestLoadRejectsUnknownField 验证配置中出现的未知字段（大小写不一致）会被拒绝，
// 且错误信息精确包含该字段名 SystemctlPath。
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)
	}
}

// TestLoadAcceptsProductionEnvironment 验证 environment 取值为 prod 时能被接受，
// 并正确解析到 EnvironmentProd。
func TestLoadAcceptsProductionEnvironment(t *testing.T) {
	content := strings.Replace(validNativeConfig, `environment = "dev"`, `environment = "prod"`, 1)
	config, err := Load(writeConfig(t, content))
	if err != nil {
		t.Fatalf("load production environment: %v", err)
	}
	if config.Daemon.Environment != EnvironmentProd {
		t.Fatalf("unexpected daemon environment: %q", config.Daemon.Environment)
	}
}

// TestLoadRejectsMissingDaemonTable 验证缺失 daemon 顶层表时会被拒绝，
// 且错误信息提示 daemon 表是必需的。
func TestLoadRejectsMissingDaemonTable(t *testing.T) {
	content := strings.Replace(validNativeConfig, "[daemon]\nenvironment = \"dev\"\n\n", "", 1)
	_, err := Load(writeConfig(t, content))
	if err == nil || !strings.Contains(err.Error(), "daemon table is required") {
		t.Fatalf("expected missing daemon table rejection, got %v", err)
	}
}

// TestLoadRejectsChangedEnvironment 验证 environment 被篡改为非法取值时会被拒绝，
// 且错误信息精确指向 daemon.environment 字段。
func TestLoadRejectsChangedEnvironment(t *testing.T) {
	content := strings.Replace(validNativeConfig, `environment = "dev"`, `environment = "development"`, 1)
	_, err := Load(writeConfig(t, content))
	if err == nil || !strings.Contains(err.Error(), "daemon.environment") {
		t.Fatalf("expected exact daemon environment rejection, got %v", err)
	}
}

// TestLoadRejectsUnknownDaemonField 验证 daemon 表中出现的未知字段（大小写不一致）
// 会被拒绝，且错误信息精确包含该字段名 daemon.Environment。
func TestLoadRejectsUnknownDaemonField(t *testing.T) {
	content := strings.Replace(validNativeConfig, `environment = "dev"`, "environment = \"dev\"\nEnvironment = \"dev\"", 1)
	_, err := Load(writeConfig(t, content))
	if err == nil || !strings.Contains(err.Error(), "daemon.Environment") {
		t.Fatalf("expected exact daemon field rejection, got %v", err)
	}
}

// TestLoadRejectsWrongTableCase 验证表名大小写不一致（[Backend]）时会被拒绝，
// 且错误信息精确包含该表名 Backend。
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)
	}
}

// TestLoadRejectsMissingNativeField 验证原生配置缺失 active_jar 字段时会被拒绝，
// 且错误信息精确指向 backend.active_jar 字段。
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)
	}
}

// TestLoadRejectsUnknownSlot 验证配置中出现未受支持的槽位（9090）时会被拒绝，
// 且错误信息精确包含该端口号 9090。
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)
	}
}

// TestLoadRejectsChangedSlotEndpoint 验证槽位健康端点被篡改时会被拒绝，
// 且错误信息精确指向 backend.slot.8080.health_endpoint 字段。
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)
	}
}

// TestLoadAcceptsExplicitUsrBinSystemctlPath 验证显式指定的 /usr/bin/systemctl 路径
// 能被接受并原样解析，说明 systemctl_path 只要求绝对路径而不绑定单一取值。
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)
	}
}

// TestLoadRejectsChangedBackendTypeCase 验证 backend.type 大小写不一致（Native）时会被拒绝，
// 且错误信息精确指向 backend.type 字段。
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)
	}
}

// TestLoadRejectsDuplicateField 验证 TOML 中重复出现的字段会被拒绝，
// 确保配置没有歧义。
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")
	}
}

// TestLoadRequiresAbsoluteConfigurationPath 验证 Load 要求传入绝对路径，
// 相对路径会被拒绝且错误信息提示 absolute path。
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)
	}
}

// TestSlotForPortRejectsUnsupportedPort 验证 SlotForPort 对未受支持端口返回错误。
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")
	}
}

// writeConfig 将 content 写入临时目录下的 yms-daemon.toml 并返回其绝对路径，
// 供 Load 测试使用。写入失败会直接终止测试。
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
}