package config_test

import (
	"context"
	"os"
	"path/filepath"
	"strings"
	"testing"
	"time"

	"statuspanel/internal/config"
)

func TestLoad(t *testing.T) {
	t.Run("loads valid yaml with defaults", func(t *testing.T) {
		path := writeConfig(t, `
interface: eth0
dns:
  server: 1.1.1.1
  domain: example.com
targets:
  - name: router
    address: 192.0.2.1
`)

		cfg, err := config.Load(context.Background(), path)
		if err != nil {
			t.Fatalf("Load() error = %v", err)
		}
		if cfg.Interface != "eth0" {
			t.Fatalf("Interface = %q, want eth0", cfg.Interface)
		}
		if cfg.Refresh.Duration != 2*time.Second {
			t.Fatalf("Refresh = %v, want 2s", cfg.Refresh.Duration)
		}
		if cfg.Ping.Timeout.Duration != time.Second {
			t.Fatalf("Ping timeout = %v, want 1s", cfg.Ping.Timeout.Duration)
		}
	})

	t.Run("rejects missing required values", func(t *testing.T) {
		path := writeConfig(t, `refresh: 1s`)

		_, err := config.Load(context.Background(), path)
		if err == nil {
			t.Fatal("Load() error = nil, want validation error")
		}
		for _, want := range []string{"interface is required", "dns.server is required", "dns.domain is required"} {
			if !strings.Contains(err.Error(), want) {
				t.Fatalf("Load() error = %q, want containing %q", err, want)
			}
		}
	})
}

func TestDurationUnmarshalYAML(t *testing.T) {
	path := writeConfig(t, `
interface: eth0
refresh: 500ms
dns:
  server: 1.1.1.1
  domain: example.com
  timeout: 250ms
ping:
  timeout: 750ms
`)

	cfg, err := config.Load(context.Background(), path)
	if err != nil {
		t.Fatalf("Load() error = %v", err)
	}
	if cfg.Refresh.Duration != 500*time.Millisecond {
		t.Fatalf("Refresh = %v, want 500ms", cfg.Refresh.Duration)
	}
	if cfg.DNS.Timeout.Duration != 250*time.Millisecond {
		t.Fatalf("DNS timeout = %v, want 250ms", cfg.DNS.Timeout.Duration)
	}
	if cfg.Ping.Timeout.Duration != 750*time.Millisecond {
		t.Fatalf("Ping timeout = %v, want 750ms", cfg.Ping.Timeout.Duration)
	}
}

func writeConfig(t *testing.T, contents string) string {
	t.Helper()
	path := filepath.Join(t.TempDir(), "statuspanel.yaml")
	if err := os.WriteFile(path, []byte(contents), 0o600); err != nil {
		t.Fatalf("writing config: %v", err)
	}
	return path
}