package config

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

func TestLoadEnvFile(t *testing.T) {
	path := filepath.Join(t.TempDir(), ".env")
	os.WriteFile(path, []byte(`
# comment
LLM_MODEL=from-file
export LOCALCHAT_TITLE="My Chat"
SYSTEM_PROMPT='Talk like a pirate = arr'
LLM_BASE_URL=http://file/v1/
`), 0o600)

	t.Setenv("LLM_BASE_URL", "http://env/v1") // real env wins over the file
	for _, k := range []string{"LLM_MODEL", "LOCALCHAT_TITLE", "SYSTEM_PROMPT"} {
		t.Setenv(k, "")
		os.Unsetenv(k)
	}

	if err := LoadEnvFile(path); err != nil {
		t.Fatal(err)
	}
	c, err := Load()
	if err != nil {
		t.Fatal(err)
	}
	if c.Model != "from-file" || c.Title != "My Chat" || c.SystemPrompt != "Talk like a pirate = arr" {
		t.Fatalf("unexpected config: %+v", c)
	}
	if c.BaseURL != "http://env/v1" {
		t.Fatalf("env should override file, got %q", c.BaseURL)
	}
}

func TestLoadValidates(t *testing.T) {
	t.Setenv("MAX_HISTORY", "zero")
	if _, err := Load(); err == nil {
		t.Fatal("want error for bad MAX_HISTORY")
	}
}