package sms

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

func TestLoadDefaultConfig_FileThenEnvOverride(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "config.yaml")
	content := "serviceType: \"1\"\nregionId: cn-qingdao\naccessKeyId: file-ak\naccessKeySecret: file-sk\nsignName: 示例签名\n"
	if err := os.WriteFile(path, []byte(content), 0o600); err != nil {
		t.Fatal(err)
	}

	t.Setenv("SMS_CONFIG_FILE", path)
	t.Setenv("SMS_ACCESS_KEY_SECRET", "env-sk")
	t.Setenv("SMS_ACCESS_KEY_ID", "")
	t.Setenv("SMS_TEMPLATE_ID", "")

	cfg, source, err := LoadDefaultConfig()
	if err != nil {
		t.Fatalf("LoadDefaultConfig: %v", err)
	}
	if source.File != path {
		t.Errorf("source.File = %q, want %q", source.File, path)
	}
	if len(source.Env) != 1 || source.Env[0] != "SMS_ACCESS_KEY_SECRET" {
		t.Errorf("source.Env = %v, want [SMS_ACCESS_KEY_SECRET]", source.Env)
	}
	if cfg.AccessKeyID != "file-ak" {
		t.Errorf("AccessKeyID = %q, want file-ak (文件值应保留)", cfg.AccessKeyID)
	}
	if cfg.AccessKeySecret != "env-sk" {
		t.Errorf("AccessKeySecret = %q, want env-sk (环境变量应覆盖文件值)", cfg.AccessKeySecret)
	}
	if cfg.RegionID != "cn-qingdao" {
		t.Errorf("RegionID = %q, want cn-qingdao", cfg.RegionID)
	}
	if cfg.SignName != "示例签名" {
		t.Errorf("SignName = %q, want 示例签名", cfg.SignName)
	}
}

func TestLoadDefaultConfig_NoFile(t *testing.T) {
	dir := t.TempDir()
	t.Setenv("SMS_CONFIG_FILE", filepath.Join(dir, "missing.yaml"))
	if _, _, err := LoadDefaultConfig(); err == nil {
		t.Fatal("显式指定配置文件但缺失时应返回错误")
	}
}

func TestLoadDefaultConfig_RegionDefault(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "config.yaml")
	if err := os.WriteFile(path, []byte("signName: 示例签名\n"), 0o600); err != nil {
		t.Fatal(err)
	}
	t.Setenv("SMS_CONFIG_FILE", path)
	t.Setenv("SMS_REGION_ID", "")

	cfg, _, err := LoadDefaultConfig()
	if err != nil {
		t.Fatal(err)
	}
	if cfg.RegionID != "cn-hangzhou" {
		t.Errorf("RegionID = %q, want cn-hangzhou", cfg.RegionID)
	}
}

func TestMergeConfig_CallerWinsThenDefault(t *testing.T) {
	def := Config{ServiceType: "1", RegionID: "cn-hangzhou", AccessKeyID: "ak", SignName: "示例签名"}
	got := mergeConfig(def, Config{TemplateID: "SMS_298990049"})
	if got.TemplateID != "SMS_298990049" {
		t.Errorf("TemplateID = %q, want SMS_298990049", got.TemplateID)
	}
	if got.AccessKeyID != "ak" || got.SignName != "示例签名" {
		t.Errorf("凭证/签名未从默认配置回退: %+v", got)
	}
}

func TestLoadDefaultConfig_RejectsDirectory(t *testing.T) {
	dir := t.TempDir()
	// 模拟 Docker 在挂载源缺失时自动创建的目录
	bad := filepath.Join(dir, "config.yaml")
	if err := os.Mkdir(bad, 0o755); err != nil {
		t.Fatal(err)
	}
	t.Setenv("SMS_CONFIG_FILE", bad)
	if _, _, err := LoadDefaultConfig(); err == nil {
		t.Fatal("配置文件是目录时应返回错误，避免静默使用空凭证")
	}
}