package main

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

func TestLoadConfigExplicitPath(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "mcrctl.toml")
	data := []byte(`server = "https://reg.example.com"
grpc   = "reg.example.com:9443"
token  = "file-token"
ca_cert = "/path/to/ca.pem"
`)
	if err := os.WriteFile(path, data, 0o600); err != nil {
		t.Fatal(err)
	}

	cfg, err := loadConfig(path)
	if err != nil {
		t.Fatal(err)
	}

	if cfg.Server != "https://reg.example.com" {
		t.Errorf("Server = %q, want %q", cfg.Server, "https://reg.example.com")
	}
	if cfg.GRPC != "reg.example.com:9443" {
		t.Errorf("GRPC = %q, want %q", cfg.GRPC, "reg.example.com:9443")
	}
	if cfg.Token != "file-token" {
		t.Errorf("Token = %q, want %q", cfg.Token, "file-token")
	}
	if cfg.CACert != "/path/to/ca.pem" {
		t.Errorf("CACert = %q, want %q", cfg.CACert, "/path/to/ca.pem")
	}
}

func TestLoadConfigMissingDefaultIsOK(t *testing.T) {
	// Empty path triggers default search; missing file is not an error.
	cfg, err := loadConfig("")
	if err != nil {
		t.Fatal(err)
	}
	if cfg.Server != "" || cfg.GRPC != "" || cfg.Token != "" {
		t.Errorf("expected zero config from missing default, got %+v", cfg)
	}
}

func TestLoadConfigMissingExplicitIsError(t *testing.T) {
	_, err := loadConfig("/nonexistent/mcrctl.toml")
	if err == nil {
		t.Fatal("expected error for missing explicit config path")
	}
}

func TestLoadConfigInvalidTOML(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "bad.toml")
	if err := os.WriteFile(path, []byte("not valid [[[ toml"), 0o600); err != nil {
		t.Fatal(err)
	}

	_, err := loadConfig(path)
	if err == nil {
		t.Fatal("expected error for invalid TOML")
	}
}

func TestLoadConfigPartial(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "mcrctl.toml")
	data := []byte(`server = "https://reg.example.com"
`)
	if err := os.WriteFile(path, data, 0o600); err != nil {
		t.Fatal(err)
	}

	cfg, err := loadConfig(path)
	if err != nil {
		t.Fatal(err)
	}

	if cfg.Server != "https://reg.example.com" {
		t.Errorf("Server = %q, want %q", cfg.Server, "https://reg.example.com")
	}
	if cfg.GRPC != "" {
		t.Errorf("GRPC should be empty, got %q", cfg.GRPC)
	}
}