package config

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

func TestResolvePathPrecedence(t *testing.T) {
	t.Setenv("AMCS_CONFIG", "/tmp/from-env.yaml")

	if got := ResolvePath("/tmp/explicit.yaml"); got != "/tmp/explicit.yaml" {
		t.Fatalf("ResolvePath explicit = %q, want %q", got, "/tmp/explicit.yaml")
	}

	if got := ResolvePath(""); got != "/tmp/from-env.yaml" {
		t.Fatalf("ResolvePath env = %q, want %q", got, "/tmp/from-env.yaml")
	}
}

func TestLoadAppliesEnvOverrides(t *testing.T) {
	configPath := filepath.Join(t.TempDir(), "test.yaml")
	if err := os.WriteFile(configPath, []byte(`
server:
  port: 8080
mcp:
  path: "/mcp"
auth:
  keys:
    - id: "test"
      value: "secret"
database:
  url: "postgres://from-file"
ai:
  provider: "litellm"
  embeddings:
    dimensions: 1536
  litellm:
    base_url: "http://localhost:4000/v1"
    api_key: "file-key"
search:
  default_limit: 10
  max_limit: 50
logging:
  level: "info"
`), 0o600); err != nil {
		t.Fatalf("write config: %v", err)
	}

	t.Setenv("AMCS_DATABASE_URL", "postgres://from-env")
	t.Setenv("AMCS_LITELLM_API_KEY", "env-key")
	t.Setenv("AMCS_SERVER_PORT", "9090")

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

	if loadedFrom != configPath {
		t.Fatalf("loadedFrom = %q, want %q", loadedFrom, configPath)
	}
	if cfg.Database.URL != "postgres://from-env" {
		t.Fatalf("database url = %q, want env override", cfg.Database.URL)
	}
	if cfg.AI.LiteLLM.APIKey != "env-key" {
		t.Fatalf("litellm api key = %q, want env override", cfg.AI.LiteLLM.APIKey)
	}
	if cfg.Server.Port != 9090 {
		t.Fatalf("server port = %d, want 9090", cfg.Server.Port)
	}
}

func TestLoadAppliesOllamaEnvOverrides(t *testing.T) {
	configPath := filepath.Join(t.TempDir(), "test.yaml")
	if err := os.WriteFile(configPath, []byte(`
server:
  port: 8080
mcp:
  path: "/mcp"
auth:
  keys:
    - id: "test"
      value: "secret"
database:
  url: "postgres://from-file"
ai:
  provider: "ollama"
  embeddings:
    model: "nomic-embed-text"
    dimensions: 768
  metadata:
    model: "llama3.2"
  ollama:
    base_url: "http://localhost:11434/v1"
    api_key: "ollama"
search:
  default_limit: 10
  max_limit: 50
logging:
  level: "info"
`), 0o600); err != nil {
		t.Fatalf("write config: %v", err)
	}

	t.Setenv("AMCS_OLLAMA_BASE_URL", "https://ollama.example.com/v1")
	t.Setenv("AMCS_OLLAMA_API_KEY", "remote-key")

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

	if cfg.AI.Ollama.BaseURL != "https://ollama.example.com/v1" {
		t.Fatalf("ollama base url = %q, want env override", cfg.AI.Ollama.BaseURL)
	}
	if cfg.AI.Ollama.APIKey != "remote-key" {
		t.Fatalf("ollama api key = %q, want env override", cfg.AI.Ollama.APIKey)
	}
}