package config

import (
	"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 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 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.CompanyLimit != 2 {
		t.Fatalf("expected pro company limit 2, got %d", pro.CompanyLimit)
	}
}

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

	dir := t.TempDir()
	path := filepath.Join(dir, "config.yaml")
	if err := os.WriteFile(path, []byte(body), 0o600); err != nil {
		t.Fatalf("write config: %v", err)
	}

	return path
}