package config_test

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

	"github.com/uopi/uopi/internal/config"
)

func TestDefault(t *testing.T) {
	cfg := config.Default()
	if cfg.Server.Listen == "" {
		t.Error("Default Listen must not be empty")
	}
	if cfg.Server.StorageDir == "" {
		t.Error("Default StorageDir must not be empty")
	}
	if !cfg.Datasource.Stub.Enabled {
		t.Error("Stub should be enabled by default")
	}
	if !cfg.Datasource.EPICS.Enabled {
		t.Error("EPICS should be enabled by default")
	}
	if !cfg.Datasource.Synthetic.Enabled {
		t.Error("Synthetic should be enabled by default")
	}
}

func TestLoadEmptyPath(t *testing.T) {
	// Empty path should return defaults without error.
	cfg, err := config.Load("")
	if err != nil {
		t.Fatalf("Load with empty path: %v", err)
	}
	if cfg.Server.Listen != config.Default().Server.Listen {
		t.Errorf("Listen = %q, want default %q", cfg.Server.Listen, config.Default().Server.Listen)
	}
}

func TestLoadTOML(t *testing.T) {
	toml := `
[server]
listen = ":9090"
storage_dir = "/tmp/uopi-test"

[datasource.stub]
enabled = false

[datasource.epics]
enabled = false
ca_addr_list = "192.168.1.1"
`
	f := filepath.Join(t.TempDir(), "uopi.toml")
	if err := os.WriteFile(f, []byte(toml), 0o644); err != nil {
		t.Fatal(err)
	}

	cfg, err := config.Load(f)
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if cfg.Server.Listen != ":9090" {
		t.Errorf("Listen = %q, want :9090", cfg.Server.Listen)
	}
	if cfg.Server.StorageDir != "/tmp/uopi-test" {
		t.Errorf("StorageDir = %q", cfg.Server.StorageDir)
	}
	if cfg.Datasource.Stub.Enabled {
		t.Error("Stub.Enabled should be false")
	}
	if cfg.Datasource.EPICS.Enabled {
		t.Error("EPICS.Enabled should be false")
	}
	if cfg.Datasource.EPICS.CAAddrList != "192.168.1.1" {
		t.Errorf("CAAddrList = %q", cfg.Datasource.EPICS.CAAddrList)
	}
}

func TestLoadBadPath(t *testing.T) {
	_, err := config.Load("/no/such/file.toml")
	if err == nil {
		t.Error("expected error for missing file")
	}
}

func TestEnvOverrides(t *testing.T) {
	t.Setenv("UOPI_SERVER_LISTEN", ":7777")
	t.Setenv("UOPI_SERVER_STORAGE_DIR", "/env/storage")
	t.Setenv("UOPI_EPICS_CA_ADDR_LIST", "10.0.0.1 10.0.0.2")
	t.Setenv("UOPI_EPICS_ARCHIVE_URL", "http://archive/")
	t.Setenv("UOPI_EPICS_CHANNEL_FINDER_URL", "http://cf/")

	cfg, err := config.Load("")
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if cfg.Server.Listen != ":7777" {
		t.Errorf("Listen = %q, want :7777", cfg.Server.Listen)
	}
	if cfg.Server.StorageDir != "/env/storage" {
		t.Errorf("StorageDir = %q", cfg.Server.StorageDir)
	}
	if cfg.Datasource.EPICS.CAAddrList != "10.0.0.1 10.0.0.2" {
		t.Errorf("CAAddrList = %q", cfg.Datasource.EPICS.CAAddrList)
	}
	if cfg.Datasource.EPICS.ArchiveURL != "http://archive/" {
		t.Errorf("ArchiveURL = %q", cfg.Datasource.EPICS.ArchiveURL)
	}
	if cfg.Datasource.EPICS.ChannelFinderURL != "http://cf/" {
		t.Errorf("ChannelFinderURL = %q", cfg.Datasource.EPICS.ChannelFinderURL)
	}
}

func TestEnvTrimsWhitespace(t *testing.T) {
	t.Setenv("UOPI_SERVER_LISTEN", "  :8888  ")
	cfg, err := config.Load("")
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if cfg.Server.Listen != ":8888" {
		t.Errorf("Listen = %q, expected whitespace trimmed", cfg.Server.Listen)
	}
}