package config

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

func TestLoadPrefersEnvLLMAPIKey(t *testing.T) {
	t.Setenv("LLM_API_KEY", "env-priority-key")

	configPath := writeTestConfig(t, `
llm:
  provider: ark
  api_key: "config-file-key"
`)

	cfg, err := Load(configPath)
	if err != nil {
		t.Fatalf("Load() error = %v", err)
	}

	if cfg.LLM.APIKey != "env-priority-key" {
		t.Fatalf("expected env api key, got %q", cfg.LLM.APIKey)
	}
}

func TestDatabaseConfigDSNEscapesCredentials(t *testing.T) {
	cfg := DatabaseConfig{
		Host:     "db.internal",
		Port:     5432,
		User:     "geo",
		Password: "p@ss:word/with?symbols",
		DBName:   "geo",
		SSLMode:  "disable",
	}

	got := cfg.DSN()
	want := "postgres://geo:p%40ss%3Aword%2Fwith%3Fsymbols@db.internal:5432/geo?sslmode=disable"
	if got != want {
		t.Fatalf("DSN() = %q, want %q", got, want)
	}
}

func TestLoadFallsBackToConfigLLMAPIKey(t *testing.T) {
	t.Setenv("LLM_API_KEY", "")

	configPath := writeTestConfig(t, `
llm:
  provider: ark
  api_key: "config-file-key"
`)

	cfg, err := Load(configPath)
	if err != nil {
		t.Fatalf("Load() error = %v", err)
	}

	if cfg.LLM.APIKey != "config-file-key" {
		t.Fatalf("expected config api key, got %q", cfg.LLM.APIKey)
	}
}

func TestLoadPrefersEnvRetrievalAndQdrantSettings(t *testing.T) {
	t.Setenv("SILICONFLOW_API_KEY", "siliconflow-env-key")
	t.Setenv("SILICONFLOW_EMBEDDING_MODEL", "env-embedding")
	t.Setenv("SILICONFLOW_RERANKER_MODEL", "env-reranker")
	t.Setenv("QDRANT_API_KEY", "qdrant-env-key")
	t.Setenv("QDRANT_URL", "qdrant-env:6334")
	t.Setenv("QDRANT_COLLECTION", "env_collection")

	configPath := writeTestConfig(t, `
qdrant:
  url: qdrant-config:6334
  api_key: "qdrant-config-key"
  collection: "config_collection"
retrieval:
  provider: siliconflow
  api_key: "retrieval-config-key"
  embedding_model: "config-embedding"
  reranker_model: "config-reranker"
`)

	cfg, err := Load(configPath)
	if err != nil {
		t.Fatalf("Load() error = %v", err)
	}

	if cfg.Retrieval.APIKey != "siliconflow-env-key" {
		t.Fatalf("expected env retrieval api key, got %q", cfg.Retrieval.APIKey)
	}
	if cfg.Retrieval.EmbeddingModel != "env-embedding" {
		t.Fatalf("expected env embedding model, got %q", cfg.Retrieval.EmbeddingModel)
	}
	if cfg.Retrieval.RerankerModel != "env-reranker" {
		t.Fatalf("expected env reranker model, got %q", cfg.Retrieval.RerankerModel)
	}
	if cfg.Qdrant.APIKey != "qdrant-env-key" {
		t.Fatalf("expected env qdrant api key, got %q", cfg.Qdrant.APIKey)
	}
	if cfg.Qdrant.URL != "qdrant-env:6334" {
		t.Fatalf("expected env qdrant url, got %q", cfg.Qdrant.URL)
	}
	if cfg.Qdrant.Collection != "env_collection" {
		t.Fatalf("expected env qdrant collection, got %q", cfg.Qdrant.Collection)
	}
}

func TestLoadAppliesBrandLibraryDefaults(t *testing.T) {
	configPath := writeTestConfig(t, `
brand_library: {}
`)

	cfg, err := Load(configPath)
	if err != nil {
		t.Fatalf("Load() error = %v", err)
	}

	if cfg.BrandLibrary.FreeBrandLimit != 1 {
		t.Fatalf("expected default free brand limit 1, got %d", cfg.BrandLibrary.FreeBrandLimit)
	}
	if cfg.BrandLibrary.PaidBrandLimit != 2 {
		t.Fatalf("expected default paid brand limit 2, got %d", cfg.BrandLibrary.PaidBrandLimit)
	}
	if cfg.BrandLibrary.MaxKeywords != 5 {
		t.Fatalf("expected default max keywords 5, got %d", cfg.BrandLibrary.MaxKeywords)
	}
	if cfg.BrandLibrary.MaxQuestionsPerKeyword != 5 {
		t.Fatalf("expected default max questions per keyword 5, got %d", cfg.BrandLibrary.MaxQuestionsPerKeyword)
	}
}

func TestLoadAppliesServerTrustedProxyDefaultsAndOverrides(t *testing.T) {
	defaultConfigPath := writeTestConfig(t, `
server: {}
`)

	cfg, err := Load(defaultConfigPath)
	if err != nil {
		t.Fatalf("Load() default error = %v", err)
	}
	if got := cfg.Server.TrustedProxies; len(got) != len(DefaultTrustedProxies()) {
		t.Fatalf("expected default trusted proxies, got %#v", got)
	}

	overrideConfigPath := writeTestConfig(t, `
server:
  trusted_proxies:
    - " 10.42.0.0/16 "
    - ""
    - "192.168.1.10"
`)

	cfg, err = Load(overrideConfigPath)
	if err != nil {
		t.Fatalf("Load() override error = %v", err)
	}
	want := []string{"10.42.0.0/16", "192.168.1.10"}
	if len(cfg.Server.TrustedProxies) != len(want) {
		t.Fatalf("trusted proxies = %#v, want %#v", cfg.Server.TrustedProxies, want)
	}
	for i := range want {
		if cfg.Server.TrustedProxies[i] != want[i] {
			t.Fatalf("trusted proxies = %#v, want %#v", cfg.Server.TrustedProxies, want)
		}
	}
}

func TestLoadAppliesSchedulerHTTPDefaultsAndDisableSentinel(t *testing.T) {
	defaultConfigPath := writeTestConfig(t, `
scheduler: {}
`)

	cfg, err := Load(defaultConfigPath)
	if err != nil {
		t.Fatalf("Load() default error = %v", err)
	}
	if cfg.Scheduler.HTTPHost != "127.0.0.1" {
		t.Fatalf("expected default scheduler http host 127.0.0.1, got %q", cfg.Scheduler.HTTPHost)
	}
	if cfg.Scheduler.HTTPPort != 8081 {
		t.Fatalf("expected default scheduler http port 8081, got %d", cfg.Scheduler.HTTPPort)
	}

	disabledConfigPath := writeTestConfig(t, `
scheduler:
  http_port: -1
`)

	cfg, err = Load(disabledConfigPath)
	if err != nil {
		t.Fatalf("Load() disabled error = %v", err)
	}
	if cfg.Scheduler.HTTPPort != -1 {
		t.Fatalf("expected scheduler http port -1 to disable server, got %d", cfg.Scheduler.HTTPPort)
	}
}

func TestLoadAppliesRedisAndCacheDefaults(t *testing.T) {
	configPath := writeTestConfig(t, `
redis: {}
cache: {}
`)

	cfg, err := Load(configPath)
	if err != nil {
		t.Fatalf("Load() error = %v", err)
	}

	if cfg.Redis.Addr != "localhost:6379" {
		t.Fatalf("expected default redis addr, got %q", cfg.Redis.Addr)
	}
	if cfg.Redis.DialTimeout != 5*time.Second {
		t.Fatalf("expected default redis dial timeout 5s, got %s", cfg.Redis.DialTimeout)
	}
	if cfg.Redis.ReadTimeout != 3*time.Second {
		t.Fatalf("expected default redis read timeout 3s, got %s", cfg.Redis.ReadTimeout)
	}
	if cfg.Redis.WriteTimeout != 3*time.Second {
		t.Fatalf("expected default redis write timeout 3s, got %s", cfg.Redis.WriteTimeout)
	}
	if cfg.Redis.PoolSize != 16 {
		t.Fatalf("expected default redis pool size 16, got %d", cfg.Redis.PoolSize)
	}
	if cfg.Redis.PoolTimeout != 4*time.Second {
		t.Fatalf("expected default redis pool timeout 4s, got %s", cfg.Redis.PoolTimeout)
	}
	if cfg.Cache.Driver != "redis" {
		t.Fatalf("expected default cache driver redis, got %q", cfg.Cache.Driver)
	}
	if cfg.Cache.Namespace != "geo" {
		t.Fatalf("expected default cache namespace geo, got %q", cfg.Cache.Namespace)
	}
	if cfg.Cache.JitterRatio != 0.1 {
		t.Fatalf("expected default jitter ratio 0.1, got %f", cfg.Cache.JitterRatio)
	}
	if !cfg.Cache.MetricsEnabled {
		t.Fatalf("expected cache metrics enabled by default")
	}
	if cfg.Cache.AsyncFillWorkers != 2 || cfg.Cache.AsyncFillBuffer != 1024 || cfg.Cache.AsyncFillTimeout != 2*time.Second {
		t.Fatalf("unexpected async fill defaults: workers=%d buffer=%d timeout=%s", cfg.Cache.AsyncFillWorkers, cfg.Cache.AsyncFillBuffer, cfg.Cache.AsyncFillTimeout)
	}
	if cfg.Cache.L1TTL != 30*time.Second {
		t.Fatalf("expected default l1 ttl 30s, got %s", cfg.Cache.L1TTL)
	}
	if cfg.Cache.DeleteScanCount != 500 {
		t.Fatalf("expected default delete scan count 500, got %d", cfg.Cache.DeleteScanCount)
	}
}

func TestLoadAppliesRedisAndCacheOverrides(t *testing.T) {
	configPath := writeTestConfig(t, `
redis:
  addr: redis.internal:6380
  password: secret
  db: 2
  dial_timeout: 7s
  read_timeout: 8s
  write_timeout: 9s
  pool_size: 32
  min_idle_conns: 4
  max_retries: 5
  pool_timeout: 6s
  tls_enabled: true
cache:
  driver: memory
  namespace: tenant-cache
  jitter_ratio: 0.25
  metrics_enabled: false
  async_fill_enabled: true
  async_fill_workers: 3
  async_fill_buffer: 64
  async_fill_timeout: 1500ms
  l1_enabled: true
  l1_ttl: 5s
  delete_scan_count: 1200
`)

	cfg, err := Load(configPath)
	if err != nil {
		t.Fatalf("Load() error = %v", err)
	}

	if cfg.Redis.Addr != "redis.internal:6380" || cfg.Redis.Password != "secret" || cfg.Redis.DB != 2 {
		t.Fatalf("unexpected redis endpoint config: %#v", cfg.Redis)
	}
	if cfg.Redis.DialTimeout != 7*time.Second || cfg.Redis.ReadTimeout != 8*time.Second || cfg.Redis.WriteTimeout != 9*time.Second {
		t.Fatalf("unexpected redis timeout config: %#v", cfg.Redis)
	}
	if cfg.Redis.PoolSize != 32 || cfg.Redis.MinIdleConns != 4 || cfg.Redis.MaxRetries != 5 || cfg.Redis.PoolTimeout != 6*time.Second {
		t.Fatalf("unexpected redis pool config: %#v", cfg.Redis)
	}
	if cfg.Redis.TLSConfig() == nil {
		t.Fatalf("expected redis TLS config")
	}
	if cfg.Cache.Driver != "memory" || cfg.Cache.Namespace != "tenant-cache" || cfg.Cache.JitterRatio != 0.25 {
		t.Fatalf("unexpected cache base config: %#v", cfg.Cache)
	}
	if cfg.Cache.MetricsEnabled {
		t.Fatalf("expected cache metrics override false")
	}
	if !cfg.Cache.AsyncFillEnabled || cfg.Cache.AsyncFillWorkers != 3 || cfg.Cache.AsyncFillBuffer != 64 || cfg.Cache.AsyncFillTimeout != 1500*time.Millisecond {
		t.Fatalf("unexpected cache async config: %#v", cfg.Cache)
	}
	if !cfg.Cache.L1Enabled || cfg.Cache.L1TTL != 5*time.Second || cfg.Cache.DeleteScanCount != 1200 {
		t.Fatalf("unexpected cache l1/delete config: %#v", cfg.Cache)
	}
}

func TestLoadPrefersEnvSchedulerMetricsSettings(t *testing.T) {
	t.Setenv("SCHEDULER_HTTP_HOST", "0.0.0.0")
	t.Setenv("SCHEDULER_INTERNAL_METRICS_TOKEN", "env-metrics-token")

	configPath := writeTestConfig(t, `
scheduler:
  http_host: 127.0.0.1
  internal_metrics_token: config-token
`)

	cfg, err := Load(configPath)
	if err != nil {
		t.Fatalf("Load() error = %v", err)
	}
	if cfg.Scheduler.HTTPHost != "0.0.0.0" {
		t.Fatalf("expected env scheduler http host, got %q", cfg.Scheduler.HTTPHost)
	}
	if cfg.Scheduler.InternalMetricsToken != "env-metrics-token" {
		t.Fatalf("expected env scheduler metrics token, got %q", cfg.Scheduler.InternalMetricsToken)
	}
}

func TestLoadPrefersEnvJWTSettings(t *testing.T) {
	t.Setenv("JWT_SECRET", "env-jwt-secret")
	t.Setenv("JWT_ACCESS_TTL", "20m")
	t.Setenv("JWT_REFRESH_TTL", "720h")

	configPath := writeTestConfig(t, `
jwt:
  secret: config-jwt-secret
  access_ttl: 15m
  refresh_ttl: 168h
`)

	cfg, err := Load(configPath)
	if err != nil {
		t.Fatalf("Load() error = %v", err)
	}
	if cfg.JWT.Secret != "env-jwt-secret" {
		t.Fatalf("expected env jwt secret, got %q", cfg.JWT.Secret)
	}
	if cfg.JWT.AccessTTL != 20*time.Minute {
		t.Fatalf("expected env jwt access ttl 20m, got %s", cfg.JWT.AccessTTL)
	}
	if cfg.JWT.RefreshTTL != 720*time.Hour {
		t.Fatalf("expected env jwt refresh ttl 720h, got %s", cfg.JWT.RefreshTTL)
	}
}

func TestLoadAppliesMembershipDefaults(t *testing.T) {
	configPath := writeTestConfig(t, `
membership: {}
`)

	cfg, err := Load(configPath)
	if err != nil {
		t.Fatalf("Load() error = %v", err)
	}

	if cfg.Membership.DefaultPlanCode != "free" {
		t.Fatalf("expected default plan code free, got %q", cfg.Membership.DefaultPlanCode)
	}
	if len(cfg.Membership.Plans) != 3 {
		t.Fatalf("expected 3 default plans, got %d", len(cfg.Membership.Plans))
	}

	free, ok := cfg.Membership.FindPlan("free")
	if !ok {
		t.Fatalf("expected free plan to exist")
	}
	if free.ArticleGeneration != 3 {
		t.Fatalf("expected free article generation 3, got %d", free.ArticleGeneration)
	}
	if free.ImageStorageBytes != 10*1024*1024 {
		t.Fatalf("expected free image storage 10MB, got %d", free.ImageStorageBytes)
	}
	if free.CompanyLimit != 1 {
		t.Fatalf("expected free company limit 1, got %d", free.CompanyLimit)
	}
	if free.SubscriptionDuration != 72*time.Hour {
		t.Fatalf("expected free subscription duration 72h, got %s", free.SubscriptionDuration)
	}
	if !free.ContactAdminOnExpiry {
		t.Fatalf("expected free plan to require admin contact on expiry")
	}

	pro, ok := cfg.Membership.FindPlan("pro")
	if !ok {
		t.Fatalf("expected pro plan to exist")
	}
	if pro.ArticleGeneration != 400 {
		t.Fatalf("expected pro article generation 400, got %d", pro.ArticleGeneration)
	}
	if pro.AIPointsMonthly != 1500 {
		t.Fatalf("expected pro ai points 1500, got %d", pro.AIPointsMonthly)
	}
	if pro.AIPointBaseChars != 1000 {
		t.Fatalf("expected pro ai point base chars 1000, got %d", pro.AIPointBaseChars)
	}
	if pro.CompanyLimit != 2 {
		t.Fatalf("expected pro company limit 2, got %d", pro.CompanyLimit)
	}
}

func TestLoadMergesLocalOverrideAndResolvesEnvPlaceholders(t *testing.T) {
	t.Setenv("CONFIG_TEST_LLM_KEY", "placeholder-key")
	t.Setenv("LLM_API_KEY", "")

	dir := t.TempDir()
	configPath := filepath.Join(dir, "config.yaml")
	localPath := filepath.Join(dir, "config.local.yaml")
	writeFile(t, configPath, `
llm:
  provider: ark
  api_key: "${CONFIG_TEST_LLM_KEY:missing}"
  max_output_tokens: 1000
generation:
  stream_enabled: false
`)
	writeFile(t, localPath, `
generation:
  stream_enabled: true
`)

	cfg, err := Load(configPath)
	if err != nil {
		t.Fatalf("Load() error = %v", err)
	}
	if cfg.LLM.APIKey != "placeholder-key" {
		t.Fatalf("expected placeholder env api key, got %q", cfg.LLM.APIKey)
	}
	if !cfg.Generation.StreamEnabled {
		t.Fatalf("expected local override to enable generation stream")
	}
}

func TestLoadAppliesGenerationRecoveryDefaults(t *testing.T) {
	configPath := writeTestConfig(t, `
generation:
  article_timeout: 90s
`)

	cfg, err := Load(configPath)
	if err != nil {
		t.Fatalf("Load() error = %v", err)
	}

	if cfg.Generation.QueueSize != 128 {
		t.Fatalf("expected default queue size 128, got %d", cfg.Generation.QueueSize)
	}
	if cfg.Generation.WorkerConcurrency != 1 {
		t.Fatalf("expected default worker concurrency 1, got %d", cfg.Generation.WorkerConcurrency)
	}
	if cfg.Generation.TaskLeaseTTL != 3*time.Minute+30*time.Second {
		t.Fatalf("expected default task lease ttl article_timeout+2m, got %s", cfg.Generation.TaskLeaseTTL)
	}
	if cfg.Generation.TaskRecoveryInterval != time.Minute {
		t.Fatalf("expected default task recovery interval 1m, got %s", cfg.Generation.TaskRecoveryInterval)
	}
	if cfg.Generation.TaskRecoveryTimeout != 30*time.Second {
		t.Fatalf("expected default task recovery timeout 30s, got %s", cfg.Generation.TaskRecoveryTimeout)
	}
	if cfg.Generation.TaskRecoveryBatchSize != 100 {
		t.Fatalf("expected default task recovery batch size 100, got %d", cfg.Generation.TaskRecoveryBatchSize)
	}
	if cfg.Generation.TaskQueuedStaleAfter != 2*time.Minute {
		t.Fatalf("expected default queued stale after 2m, got %s", cfg.Generation.TaskQueuedStaleAfter)
	}
	if cfg.Generation.TaskMaxAttempts != 3 {
		t.Fatalf("expected default task max attempts 3, got %d", cfg.Generation.TaskMaxAttempts)
	}
	if cfg.Generation.TaskStateCheckInterval != 5*time.Minute {
		t.Fatalf("expected default task state check interval 5m, got %s", cfg.Generation.TaskStateCheckInterval)
	}
	if cfg.Generation.TaskStateCheckTimeout != 10*time.Second {
		t.Fatalf("expected default task state check timeout 10s, got %s", cfg.Generation.TaskStateCheckTimeout)
	}
	if cfg.Generation.TaskStateCheckBatchSize != 100 {
		t.Fatalf("expected default task state check batch size 100, got %d", cfg.Generation.TaskStateCheckBatchSize)
	}
	if cfg.Generation.TaskStateCheckLookback != 24*time.Hour {
		t.Fatalf("expected default task state check lookback 24h, got %s", cfg.Generation.TaskStateCheckLookback)
	}
}

func TestLoadAppliesGenerationRecoveryOverrides(t *testing.T) {
	configPath := writeTestConfig(t, `
generation:
  queue_size: 64
  worker_concurrency: 4
  article_timeout: 5m
  task_lease_ttl: 7m
  task_recovery_interval: 15s
  task_recovery_timeout: 10s
  task_recovery_batch_size: 12
  task_queued_stale_after: 45s
  task_max_attempts: 5
  task_state_check_interval: 9m
  task_state_check_timeout: 11s
  task_state_check_batch_size: 13
  task_state_check_lookback: 2h
`)

	cfg, err := Load(configPath)
	if err != nil {
		t.Fatalf("Load() error = %v", err)
	}

	if cfg.Generation.QueueSize != 64 || cfg.Generation.WorkerConcurrency != 4 || cfg.Generation.ArticleTimeout != 5*time.Minute {
		t.Fatalf("unexpected generation base config: %#v", cfg.Generation)
	}
	if cfg.Generation.TaskLeaseTTL != 7*time.Minute ||
		cfg.Generation.TaskRecoveryInterval != 15*time.Second ||
		cfg.Generation.TaskRecoveryTimeout != 10*time.Second ||
		cfg.Generation.TaskRecoveryBatchSize != 12 ||
		cfg.Generation.TaskQueuedStaleAfter != 45*time.Second ||
		cfg.Generation.TaskMaxAttempts != 5 ||
		cfg.Generation.TaskStateCheckInterval != 9*time.Minute ||
		cfg.Generation.TaskStateCheckTimeout != 11*time.Second ||
		cfg.Generation.TaskStateCheckBatchSize != 13 ||
		cfg.Generation.TaskStateCheckLookback != 2*time.Hour {
		t.Fatalf("unexpected generation recovery config: %#v", cfg.Generation)
	}
}

func TestLoadAppliesGenerationStateCheckEnvOverrides(t *testing.T) {
	t.Setenv("GENERATION_TASK_STATE_CHECK_INTERVAL", "3m")
	t.Setenv("GENERATION_TASK_STATE_CHECK_TIMEOUT", "4s")
	t.Setenv("GENERATION_TASK_STATE_CHECK_BATCH_SIZE", "17")
	t.Setenv("GENERATION_TASK_STATE_CHECK_LOOKBACK", "6h")

	configPath := writeTestConfig(t, `
generation: {}
`)

	cfg, err := Load(configPath)
	if err != nil {
		t.Fatalf("Load() error = %v", err)
	}

	if cfg.Generation.TaskStateCheckInterval != 3*time.Minute ||
		cfg.Generation.TaskStateCheckTimeout != 4*time.Second ||
		cfg.Generation.TaskStateCheckBatchSize != 17 ||
		cfg.Generation.TaskStateCheckLookback != 6*time.Hour {
		t.Fatalf("unexpected generation state check env config: %#v", cfg.Generation)
	}
}

func TestLoadAppliesBrowserFetchDefaultsAndOverrides(t *testing.T) {
	configPath := writeTestConfig(t, `
browser_fetch:
  enabled: true
  service_url: " http://browser-fetch:8082/ "
  token: " token "
  allowed_domains:
    - " zhuanlan.zhihu.com "
    - ""
  trigger_status:
    - 403
    - 403
    - 500
`)

	cfg, err := Load(configPath)
	if err != nil {
		t.Fatalf("Load() error = %v", err)
	}

	if !cfg.BrowserFetch.Enabled {
		t.Fatalf("expected browser fetch enabled")
	}
	if cfg.BrowserFetch.Provider != "lightpanda" {
		t.Fatalf("expected default provider lightpanda, got %q", cfg.BrowserFetch.Provider)
	}
	if cfg.BrowserFetch.ServiceURL != "http://browser-fetch:8082" {
		t.Fatalf("expected normalized service url, got %q", cfg.BrowserFetch.ServiceURL)
	}
	if cfg.BrowserFetch.Token != "token" {
		t.Fatalf("expected normalized token, got %q", cfg.BrowserFetch.Token)
	}
	if cfg.BrowserFetch.QueueSize != 64 ||
		cfg.BrowserFetch.WorkerConcurrency != 1 ||
		cfg.BrowserFetch.RequestTimeout != 45*time.Second ||
		cfg.BrowserFetch.CacheTTL != 6*time.Hour {
		t.Fatalf("unexpected browser fetch defaults: %#v", cfg.BrowserFetch)
	}
	if len(cfg.BrowserFetch.AllowedDomains) != 1 || cfg.BrowserFetch.AllowedDomains[0] != "zhuanlan.zhihu.com" {
		t.Fatalf("unexpected allowed domains: %#v", cfg.BrowserFetch.AllowedDomains)
	}
	if len(cfg.BrowserFetch.TriggerStatus) != 2 ||
		cfg.BrowserFetch.TriggerStatus[0] != 403 ||
		cfg.BrowserFetch.TriggerStatus[1] != 500 {
		t.Fatalf("unexpected trigger status: %#v", cfg.BrowserFetch.TriggerStatus)
	}
}

func TestLoadAppliesBrowserFetchEnvOverrides(t *testing.T) {
	t.Setenv("BROWSER_FETCH_ENABLED", "true")
	t.Setenv("BROWSER_FETCH_PROVIDER", "lightpanda_service")
	t.Setenv("BROWSER_FETCH_SERVICE_URL", "http://env-browser-fetch:8082/")
	t.Setenv("BROWSER_FETCH_TOKEN", "env-token")
	t.Setenv("BROWSER_FETCH_QUEUE_SIZE", "11")
	t.Setenv("BROWSER_FETCH_WORKER_CONCURRENCY", "3")
	t.Setenv("BROWSER_FETCH_REQUEST_TIMEOUT", "12s")
	t.Setenv("BROWSER_FETCH_CACHE_TTL", "30m")
	t.Setenv("BROWSER_FETCH_ALLOWED_DOMAINS", "zhihu.com,example.com")
	t.Setenv("BROWSER_FETCH_TRIGGER_STATUS", "403,429,broken,503")

	configPath := writeTestConfig(t, `
browser_fetch: {}
`)

	cfg, err := Load(configPath)
	if err != nil {
		t.Fatalf("Load() error = %v", err)
	}

	if !cfg.BrowserFetch.Enabled ||
		cfg.BrowserFetch.Provider != "lightpanda_service" ||
		cfg.BrowserFetch.ServiceURL != "http://env-browser-fetch:8082" ||
		cfg.BrowserFetch.Token != "env-token" ||
		cfg.BrowserFetch.QueueSize != 11 ||
		cfg.BrowserFetch.WorkerConcurrency != 3 ||
		cfg.BrowserFetch.RequestTimeout != 12*time.Second ||
		cfg.BrowserFetch.CacheTTL != 30*time.Minute {
		t.Fatalf("unexpected browser fetch env config: %#v", cfg.BrowserFetch)
	}
	if got := cfg.BrowserFetch.AllowedDomains; len(got) != 2 || got[0] != "zhihu.com" || got[1] != "example.com" {
		t.Fatalf("unexpected env allowed domains: %#v", got)
	}
	if got := cfg.BrowserFetch.TriggerStatus; len(got) != 3 || got[0] != 403 || got[1] != 429 || got[2] != 503 {
		t.Fatalf("unexpected env trigger status: %#v", got)
	}
}

func TestStoreReloadsConfigAndKeepsPreviousOnInvalidYAML(t *testing.T) {
	configPath := writeTestConfig(t, `
jwt:
  secret: first
  access_ttl: 15m
  refresh_ttl: 720h
`)

	store, err := NewStore(configPath)
	if err != nil {
		t.Fatalf("NewStore() error = %v", err)
	}
	defer store.Close()

	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	events := make(chan ReloadEvent, 4)
	go func() {
		_ = store.Watch(ctx, nil, func(event ReloadEvent) {
			events <- event
		})
	}()

	waitForStoreWatch(t, store)
	time.Sleep(100 * time.Millisecond)

	writeFile(t, configPath, `
jwt:
  secret: second
  access_ttl: 20m
  refresh_ttl: 720h
`)
	event := waitForReloadEvent(t, events)
	if event.Current.JWT.Secret != "second" {
		t.Fatalf("expected reloaded jwt secret second, got %q", event.Current.JWT.Secret)
	}
	if store.Current().JWT.AccessTTL != 20*time.Minute {
		t.Fatalf("expected store access ttl 20m, got %s", store.Current().JWT.AccessTTL)
	}

	writeFile(t, configPath, "jwt:\n  secret: [broken\n")
	time.Sleep(300 * time.Millisecond)
	if store.Current().JWT.Secret != "second" {
		t.Fatalf("expected invalid yaml to keep previous config, got %q", store.Current().JWT.Secret)
	}
}

func TestStoreReloadsWhenLocalOverrideIsCreated(t *testing.T) {
	dir := t.TempDir()
	configPath := filepath.Join(dir, "config.yaml")
	localPath := filepath.Join(dir, "config.local.yaml")
	writeFile(t, configPath, `
generation:
  stream_enabled: false
`)

	store, err := NewStore(configPath)
	if err != nil {
		t.Fatalf("NewStore() error = %v", err)
	}
	defer store.Close()

	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	events := make(chan ReloadEvent, 4)
	go func() {
		_ = store.Watch(ctx, nil, func(event ReloadEvent) {
			events <- event
		})
	}()
	waitForStoreWatch(t, store)
	time.Sleep(100 * time.Millisecond)

	writeFile(t, localPath, `
generation:
  stream_enabled: true
`)

	event := waitForReloadEvent(t, events)
	if !event.Current.Generation.StreamEnabled {
		t.Fatalf("expected created local override to enable stream")
	}
}

func writeTestConfig(t *testing.T, body string) string {
	t.Helper()

	dir := t.TempDir()
	path := filepath.Join(dir, "config.yaml")
	writeFile(t, path, body)

	return path
}

func writeFile(t *testing.T, path, body string) {
	t.Helper()
	if err := os.WriteFile(path, []byte(body), 0o600); err != nil {
		t.Fatalf("write file %s: %v", path, err)
	}
}

func waitForStoreWatch(t *testing.T, store *Store) {
	t.Helper()
	deadline := time.Now().Add(2 * time.Second)
	for time.Now().Before(deadline) {
		if store.runtime != nil && store.runtime.Value("").Load() != nil {
			return
		}
		time.Sleep(10 * time.Millisecond)
	}
	t.Fatalf("config store watcher did not start")
}

func waitForReloadEvent(t *testing.T, events <-chan ReloadEvent) ReloadEvent {
	t.Helper()
	timeout := time.After(3 * time.Second)
	for {
		select {
		case event := <-events:
			if event.Current != nil {
				return event
			}
		case <-timeout:
			t.Fatalf("timed out waiting for reload event")
		}
	}
}