package config

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

func TestLoadValid(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "test.toml")

	data := `
[database]
path = "/tmp/test.db"

[[listeners]]
addr = ":443"

  [[listeners.routes]]
  hostname = "example.com"
  backend = "127.0.0.1:8443"

[proxy]
connect_timeout = "5s"
idle_timeout = "300s"
shutdown_timeout = "30s"

[log]
level = "info"
`
	if err := os.WriteFile(path, []byte(data), 0600); err != nil {
		t.Fatalf("write config: %v", err)
	}

	cfg, err := Load(path)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}

	if len(cfg.Listeners) != 1 {
		t.Fatalf("got %d listeners, want 1", len(cfg.Listeners))
	}
	if cfg.Listeners[0].Addr != ":443" {
		t.Fatalf("got listener addr %q, want %q", cfg.Listeners[0].Addr, ":443")
	}
	if len(cfg.Listeners[0].Routes) != 1 {
		t.Fatalf("got %d routes, want 1", len(cfg.Listeners[0].Routes))
	}
	if cfg.Listeners[0].Routes[0].Hostname != "example.com" {
		t.Fatalf("got hostname %q, want %q", cfg.Listeners[0].Routes[0].Hostname, "example.com")
	}
}

func TestLoadNoDatabasePath(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "test.toml")

	data := `
[[listeners]]
addr = ":443"

  [[listeners.routes]]
  hostname = "example.com"
  backend = "127.0.0.1:8443"
`
	if err := os.WriteFile(path, []byte(data), 0600); err != nil {
		t.Fatalf("write config: %v", err)
	}

	_, err := Load(path)
	if err == nil {
		t.Fatal("expected error for missing database path")
	}
}

func TestLoadNoListenersValid(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "test.toml")

	// No listeners is valid — DB may already have them.
	data := `
[database]
path = "/tmp/test.db"

[log]
level = "info"
`
	if err := os.WriteFile(path, []byte(data), 0600); err != nil {
		t.Fatalf("write config: %v", err)
	}

	_, err := Load(path)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
}

func TestLoadDuplicateHostnames(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "test.toml")

	data := `
[database]
path = "/tmp/test.db"

[[listeners]]
addr = ":443"

  [[listeners.routes]]
  hostname = "example.com"
  backend = "127.0.0.1:8443"

  [[listeners.routes]]
  hostname = "example.com"
  backend = "127.0.0.1:9443"
`
	if err := os.WriteFile(path, []byte(data), 0600); err != nil {
		t.Fatalf("write config: %v", err)
	}

	_, err := Load(path)
	if err == nil {
		t.Fatal("expected error for duplicate hostnames")
	}
}

func TestLoadGeoIPRequiredWithCountries(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "test.toml")

	data := `
[database]
path = "/tmp/test.db"

[[listeners]]
addr = ":443"

  [[listeners.routes]]
  hostname = "example.com"
  backend = "127.0.0.1:8443"

[firewall]
blocked_countries = ["CN"]
`
	if err := os.WriteFile(path, []byte(data), 0600); err != nil {
		t.Fatalf("write config: %v", err)
	}

	_, err := Load(path)
	if err == nil {
		t.Fatal("expected error for blocked_countries without geoip_db")
	}
}

func TestLoadMultipleListeners(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "test.toml")

	data := `
[database]
path = "/tmp/test.db"

[[listeners]]
addr = ":443"

  [[listeners.routes]]
  hostname = "public.example.com"
  backend = "127.0.0.1:8443"

[[listeners]]
addr = ":8443"

  [[listeners.routes]]
  hostname = "internal.example.com"
  backend = "127.0.0.1:9443"
`
	if err := os.WriteFile(path, []byte(data), 0600); err != nil {
		t.Fatalf("write config: %v", err)
	}

	cfg, err := Load(path)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}

	if len(cfg.Listeners) != 2 {
		t.Fatalf("got %d listeners, want 2", len(cfg.Listeners))
	}
	if cfg.Listeners[0].Routes[0].Hostname != "public.example.com" {
		t.Fatalf("listener 0 hostname = %q, want %q", cfg.Listeners[0].Routes[0].Hostname, "public.example.com")
	}
	if cfg.Listeners[1].Routes[0].Hostname != "internal.example.com" {
		t.Fatalf("listener 1 hostname = %q, want %q", cfg.Listeners[1].Routes[0].Hostname, "internal.example.com")
	}
}

func TestDuration(t *testing.T) {
	var d Duration
	if err := d.UnmarshalText([]byte("5s")); err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if d.Duration.Seconds() != 5 {
		t.Fatalf("got %v, want 5s", d.Duration)
	}
}