package distribution

import (
	"errors"
	"strings"
	"testing"

	"hfb_sys/backend/internal/model"
	"hfb_sys/backend/pkg/crypto"

	"go.uber.org/zap"
)

func TestMaskSecret(t *testing.T) {
	cases := []struct {
		input string
		want  string
	}{
		{"", ""},
		{"123", "******"},
		{"123456", "******"},
		{"1234567", "123******567"},
		{"LTAI5tSecret123", "LTA******123"},
	}
	for _, c := range cases {
		got := MaskSecret(c.input)
		if got != c.want {
			t.Errorf("MaskSecret(%q) = %q, want %q", c.input, got, c.want)
		}
	}
}

func TestBuildProvider(t *testing.T) {
	logger := zap.NewNop()

	// 1. mock provider
	mockCfg := SiteSMSConfig{
		Enabled:  true,
		Provider: "mock",
	}
	provider, err := BuildProvider(mockCfg, logger)
	if err != nil || provider == nil {
		t.Fatalf("expected mock provider, got err: %v, provider: %v", err, provider)
	}

	// 2. aliyun missing fields
	invalidAliyunCfg := SiteSMSConfig{
		Enabled:     true,
		Provider:    "aliyun",
		AccessKeyID: "id",
	}
	_, err = BuildProvider(invalidAliyunCfg, logger)
	if err != ErrSMSConfigInvalid {
		t.Fatalf("expected ErrSMSConfigInvalid, got: %v", err)
	}

	// 3. disabled returns nil
	disabledCfg := SiteSMSConfig{
		Enabled:  false,
		Provider: "mock",
	}
	p, err := BuildProvider(disabledCfg, logger)
	if err != nil || p != nil {
		t.Fatalf("expected nil provider for disabled, got %v, %v", p, err)
	}
}

func TestSMSResolver_ResolveAndInvalidate(t *testing.T) {
	db := distributionTestDB(t)
	repo := NewRepository(db, nil)
	resolver := NewSMSResolver(repo, zap.NewNop())

	ctx := t.Context()

	// 1. 站点未配置短信 -> 返回 nil (回退主站)
	siteNoSMS := model.DistributionSite{
		SiteCode: "site_no_sms",
		SiteName: "无短信站",
		Domain:   "nosms.com",
		Status:   "active",
	}
	if err := db.Create(&siteNoSMS).Error; err != nil {
		t.Fatal(err)
	}

	p, err := resolver.ResolveSMSProvider(ctx, "site_no_sms", "")
	if err != nil || p != nil {
		t.Fatalf("expected nil provider for unconfigured site, got %v, %v", p, err)
	}

	// 2. 站点配置了 mock 自定义短信并启用
	mockJSON := `{"enabled":true,"provider":"mock","sign_name":"【分站签名】","login_template_code":"SMS_001"}`
	siteWithSMS := model.DistributionSite{
		SiteCode:      "site_with_sms",
		SiteName:      "独立短信站",
		Domain:        "customsms.com",
		Status:        "active",
		SMSConfigJSON: mockJSON,
	}
	if err := db.Create(&siteWithSMS).Error; err != nil {
		t.Fatal(err)
	}

	// 通过 siteCode 解析
	p1, err := resolver.ResolveSMSProvider(ctx, "site_with_sms", "")
	if err != nil || p1 == nil {
		t.Fatalf("expected resolved mock provider, got %v, err=%v", p1, err)
	}

	// 通过 domain 解析
	p2, err := resolver.ResolveSMSProvider(ctx, "", "customsms.com")
	if err != nil || p2 == nil {
		t.Fatalf("expected resolved mock provider by domain, got %v, err=%v", p2, err)
	}

	// 验证缓存命中
	if p1 != p2 {
		t.Fatalf("expected same cached provider instance")
	}

	// 3. 清理缓存后重新解析
	resolver.InvalidateCache(siteWithSMS.ID)
	if len(resolver.providers) != 0 {
		t.Fatalf("expected empty cache after InvalidateCache")
	}
}

func TestRepository_GetAndUpdateSiteSMSConfig(t *testing.T) {
	db := distributionTestDB(t)
	repo := NewRepository(db, nil)
	ctx := t.Context()

	site := model.DistributionSite{
		SiteCode: "site_cfg_test",
		SiteName: "配置测试站",
		Domain:   "cfg.com",
		Status:   "active",
	}
	if err := db.Create(&site).Error; err != nil {
		t.Fatal(err)
	}

	// 1. 获取初始配置（空）
	dto, err := repo.GetSiteSMSConfig(ctx, 0, site.ID)
	if err != nil {
		t.Fatalf("GetSiteSMSConfig failed: %v", err)
	}
	if dto.Enabled || dto.HasSecret {
		t.Fatalf("expected default empty config, got %+v", dto)
	}

	// 2. 更新配置（包含密钥）
	enabled := true
	provider := "aliyun"
	ak := "LTAI_TEST_KEY"
	secret := "SECRET_TEST_998877"
	sign := "【我的分站】"
	template := "SMS_12345"
	updated, err := repo.UpdateSiteSMSConfig(ctx, 0, site.ID, UpdateSiteSMSConfigRequest{
		Enabled:           &enabled,
		Provider:          &provider,
		AccessKeyID:       &ak,
		AccessKeySecret:   &secret,
		SignName:          &sign,
		LoginTemplateCode: &template,
	})
	if err != nil {
		t.Fatalf("UpdateSiteSMSConfig failed: %v", err)
	}
	if !updated.Enabled || !updated.HasSecret || updated.SignName != sign {
		t.Fatalf("expected updated config, got %+v", updated)
	}
	if updated.MaskedSecret == secret {
		t.Fatalf("secret should be masked in DTO")
	}

	// 3. 再次更新，不传 AccessKeySecret（留空），应保留原密钥
	newSign := "【更新后的签名】"
	emptySecret := ""
	updated2, err := repo.UpdateSiteSMSConfig(ctx, 0, site.ID, UpdateSiteSMSConfigRequest{
		SignName:        &newSign,
		AccessKeySecret: &emptySecret,
	})
	if err != nil {
		t.Fatalf("UpdateSiteSMSConfig failed: %v", err)
	}
	if updated2.SignName != newSign {
		t.Fatalf("SignName not updated: %s", updated2.SignName)
	}
	if !updated2.HasSecret {
		t.Fatalf("existing secret should be preserved when updating with empty secret")
	}

	// 4. 验证从 SiteDTO 获取时不泄露 SMSConfig（已隔离）
	foundSite, err := repo.FindSite(ctx, 0, site.ID)
	if err != nil {
		t.Fatal(err)
	}
	_ = foundSite

	// 5. 验证内部解密读取方法能够解密原密钥
	decryptedCfg, err := repo.GetDecryptedSiteSMSConfig(ctx, 0, site.ID)
	if err != nil {
		t.Fatalf("GetDecryptedSiteSMSConfig failed: %v", err)
	}
	if decryptedCfg.AccessKeySecret != secret {
		t.Fatalf("expected decrypted secret %q, got %q", secret, decryptedCfg.AccessKeySecret)
	}

	// 6. 验证开启状态下缺少必填项时拦截报错
	emptySign := ""
	_, err = repo.UpdateSiteSMSConfig(ctx, 0, site.ID, UpdateSiteSMSConfigRequest{
		SignName: &emptySign,
	})
	if !errors.Is(err, ErrSMSConfigInvalid) {
		t.Fatalf("expected ErrSMSConfigInvalid when required field is empty, got %v", err)
	}
}

func TestSMSResolver_TestSendSMS(t *testing.T) {
	resolver := NewSMSResolver(nil, zap.NewNop())
	ctx := t.Context()

	// 1. 空手机号报错
	err := resolver.TestSendSMS(ctx, 1, SiteSMSConfig{}, "")
	if err == nil {
		t.Fatal("expected error for empty phone")
	}

	// 2. mock provider 测试发送成功
	err = resolver.TestSendSMS(ctx, 1, SiteSMSConfig{
		Provider: "mock",
	}, "13800138000")
	if err != nil {
		t.Fatalf("expected success for mock provider test send, got %v", err)
	}

	// 3. 60秒内同站点同手机号触发频控限制
	err = resolver.TestSendSMS(ctx, 1, SiteSMSConfig{
		Provider: "mock",
	}, "13800138000")
	if !errors.Is(err, ErrSMSTestRateLimited) {
		t.Fatalf("expected ErrSMSTestRateLimited on immediate repeat test, got %v", err)
	}
}

func TestRepository_SMSConfigEncryptionAtRest(t *testing.T) {
	db := distributionTestDB(t)
	repo := NewRepository(db, nil)

	// 使用 32 字节 AES 密钥构建 FieldEncryptor
	encryptor, err := crypto.NewFieldEncryptor("0123456789abcdef0123456789abcdef")
	if err != nil {
		t.Fatalf("failed to create field encryptor: %v", err)
	}
	repo.SetEncryptor(encryptor)
	ctx := t.Context()

	site := model.DistributionSite{
		SiteCode: "site_enc_test",
		SiteName: "加密测试站",
		Domain:   "enctest.com",
		Status:   "active",
	}
	if err := db.Create(&site).Error; err != nil {
		t.Fatal(err)
	}

	// 1. 验证写入非法 provider 被拒绝
	badProvider := "tencent"
	_, err = repo.UpdateSiteSMSConfig(ctx, 0, site.ID, UpdateSiteSMSConfigRequest{
		Provider: &badProvider,
	})
	if !errors.Is(err, ErrSMSConfigInvalid) {
		t.Fatalf("expected ErrSMSConfigInvalid for unapproved provider, got %v", err)
	}

	// 2. 写入合法 Aliyun 配置
	enabled := true
	provider := "aliyun"
	ak := "LTAI_PLAINTEXT_ID"
	secret := "SUPER_SECRET_KEY_999888"
	sign := "【测试加固】"
	template := "SMS_666777"
	updated, err := repo.UpdateSiteSMSConfig(ctx, 0, site.ID, UpdateSiteSMSConfigRequest{
		Enabled:           &enabled,
		Provider:          &provider,
		AccessKeyID:       &ak,
		AccessKeySecret:   &secret,
		SignName:          &sign,
		LoginTemplateCode: &template,
	})
	if err != nil {
		t.Fatalf("UpdateSiteSMSConfig failed: %v", err)
	}
	if !updated.HasSecret || updated.MaskedSecret == secret {
		t.Fatalf("expected secret masked in DTO: %+v", updated)
	}

	// 3. 直接查底层 DB 原始数据，断言落库 JSON 绝不含明文 secret
	var rawSite model.DistributionSite
	if err := db.First(&rawSite, site.ID).Error; err != nil {
		t.Fatal(err)
	}
	if strings.Contains(rawSite.SMSConfigJSON, secret) {
		t.Fatalf("CRITICAL: raw database JSON contains plaintext secret! JSON=%s", rawSite.SMSConfigJSON)
	}

	// 4. 读取解密配置，断言可精准还原明文
	decryptedCfg, err := repo.GetDecryptedSiteSMSConfig(ctx, 0, site.ID)
	if err != nil {
		t.Fatalf("GetDecryptedSiteSMSConfig failed: %v", err)
	}
	if decryptedCfg.AccessKeySecret != secret {
		t.Fatalf("decrypted secret mismatch: got %q, want %q", decryptedCfg.AccessKeySecret, secret)
	}

	// 5. SMSResolver 能正确使用该站点 provider
	resolver := NewSMSResolver(repo, zap.NewNop())
	p, err := resolver.ResolveSMSProvider(ctx, "site_enc_test", "")
	if err != nil || p == nil {
		t.Fatalf("expected resolved aliyun provider, got %v, err=%v", p, err)
	}
}

func TestRepository_SMSConfigDecryptFailure(t *testing.T) {
	db := distributionTestDB(t)
	repo := NewRepository(db, nil)

	encryptor, err := crypto.NewFieldEncryptor("0123456789abcdef0123456789abcdef")
	if err != nil {
		t.Fatalf("failed to create field encryptor: %v", err)
	}
	repo.SetEncryptor(encryptor)
	ctx := t.Context()

	// 直接写入一段无法解密的密文，模拟密钥轮换/密文损坏
	corrupted := `{"enabled":true,"provider":"mock","access_key_secret":"@@not-a-valid-cipher@@"}`
	site := model.DistributionSite{
		SiteCode:      "site_bad_cipher",
		SiteName:      "损坏密文站",
		Domain:        "badcipher.com",
		Status:        "active",
		SMSConfigJSON: corrupted,
	}
	if err := db.Create(&site).Error; err != nil {
		t.Fatal(err)
	}

	// 1. 管理侧读取应显式报错，而不是把密文当明文返回
	if _, err := repo.GetDecryptedSiteSMSConfig(ctx, 0, site.ID); err == nil {
		t.Fatal("expected decrypt error for corrupted ciphertext, got nil")
	}

	// 2. 登录链路应优雅降级：返回 nil provider（回退主站）而不是抛错
	resolver := NewSMSResolver(repo, zap.NewNop())
	p, err := resolver.ResolveSMSProvider(ctx, "site_bad_cipher", "")
	if err != nil || p != nil {
		t.Fatalf("expected graceful fallback to nil provider, got %v, err=%v", p, err)
	}
}

func TestRepository_SMSProviderWhitelist(t *testing.T) {
	db := distributionTestDB(t)
	repo := NewRepository(db, nil) // 默认不允许 mock（生产语义）
	ctx := t.Context()

	site := model.DistributionSite{
		SiteCode: "site_provider_wl",
		SiteName: "服务商白名单站",
		Domain:   "providerwl.com",
		Status:   "active",
	}
	if err := db.Create(&site).Error; err != nil {
		t.Fatal(err)
	}

	enabled := true
	mockProvider := "mock"
	// 1. 默认环境下 mock 被拒绝
	if _, err := repo.UpdateSiteSMSConfig(ctx, 0, site.ID, UpdateSiteSMSConfigRequest{
		Enabled:  &enabled,
		Provider: &mockProvider,
	}); !errors.Is(err, ErrSMSConfigInvalid) {
		t.Fatalf("expected ErrSMSConfigInvalid for mock in production semantics, got %v", err)
	}

	// 2. 非生产环境显式放行后 mock 可用
	repo.SetAllowMockSMS(true)
	if _, err := repo.UpdateSiteSMSConfig(ctx, 0, site.ID, UpdateSiteSMSConfigRequest{
		Enabled:  &enabled,
		Provider: &mockProvider,
	}); err != nil {
		t.Fatalf("expected mock provider to be accepted when allowed, got %v", err)
	}
}