package core

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

func TestLoadConfigDefaults(t *testing.T) {
	// No environment set: every field should have a usable default.
	cfg, err := LoadConfig()
	if err != nil {
		t.Fatalf("LoadConfig: %v", err)
	}
	if cfg.Listen != ":7788" {
		t.Errorf("Listen = %q, want :7788", cfg.Listen)
	}
	if !filepath.IsAbs(cfg.DataDir) {
		t.Errorf("DataDir = %q, want absolute", cfg.DataDir)
	}
	if cfg.DBPath != filepath.Join(cfg.DataDir, "vellum.db") {
		t.Errorf("DBPath = %q, want <DataDir>/vellum.db", cfg.DBPath)
	}
	if cfg.LogLevel != "info" {
		t.Errorf("LogLevel = %q, want info", cfg.LogLevel)
	}
}

func TestLoadConfigFromEnv(t *testing.T) {
	t.Setenv("VELLUM_LISTEN", "127.0.0.1:9999")
	t.Setenv("VELLUM_DATA_DIR", "/tmp/vellum-data")
	t.Setenv("VELLUM_MEDIA_DIRS", "/media/a:/media/b")
	t.Setenv("VELLUM_SESSION_TTL", "48h")

	cfg, err := LoadConfig()
	if err != nil {
		t.Fatalf("LoadConfig: %v", err)
	}
	if cfg.Listen != "127.0.0.1:9999" {
		t.Errorf("Listen = %q", cfg.Listen)
	}
	if cfg.DataDir != "/tmp/vellum-data" {
		t.Errorf("DataDir = %q", cfg.DataDir)
	}
	if len(cfg.MediaDirs) != 2 || cfg.MediaDirs[0] != "/media/a" {
		t.Errorf("MediaDirs = %v", cfg.MediaDirs)
	}
	if cfg.SessionTTL.Hours() != 48 {
		t.Errorf("SessionTTL = %v, want 48h", cfg.SessionTTL)
	}
}

func TestValidateRejectsMissingMediaDir(t *testing.T) {
	cfg := Config{
		DataDir:   t.TempDir(),
		ConfigDir: t.TempDir(),
		MediaDirs: []string{"/definitely/not/a/real/path"},
	}
	err := cfg.Validate()
	if err == nil {
		t.Fatal("expected error for missing media dir")
	}
	if !strings.Contains(err.Error(), "/definitely/not/a/real/path") {
		t.Errorf("error %q should name the offending path", err)
	}
}

func TestValidateCreatesDirs(t *testing.T) {
	base := t.TempDir()
	cfg := Config{
		DataDir:   filepath.Join(base, "data"),
		ConfigDir: filepath.Join(base, "config"),
	}
	if err := cfg.Validate(); err != nil {
		t.Fatalf("Validate: %v", err)
	}
}