package config

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

func writeTempConfig(t *testing.T, content string) string {
	t.Helper()
	dir := t.TempDir()
	path := filepath.Join(dir, "telegram.yaml")
	if err := os.WriteFile(path, []byte(content), 0644); err != nil {
		t.Fatalf("failed to write temp config: %v", err)
	}
	return path
}

func TestLoad_ValidConfig(t *testing.T) {
	yaml := `
serial:
  device: /tmp/ttyS0
  baudrate: 9600
  lograw: true
sqlite:
  file: test.db
  init: false
socket:
  address: 127.0.0.1:6000
pulsar:
  url: pulsar://localhost:6650
  topic: telegrams
  name: reader
telegram:
  tcp: true
  pulsar: true
`
	path := writeTempConfig(t, yaml)
	cfg, err := Load(path)
	if err != nil {
		t.Fatalf("Load() failed: %v", err)
	}

	if cfg.Serial.Device != "/tmp/ttyS0" {
		t.Errorf("expected device /tmp/ttyS0, got %s", cfg.Serial.Device)
	}
	if cfg.Serial.Baudrate != 9600 {
		t.Errorf("expected baudrate 9600, got %d", cfg.Serial.Baudrate)
	}
	if !cfg.Serial.LogRaw {
		t.Error("expected lograw=true")
	}
	if cfg.SQLite.File != "test.db" {
		t.Errorf("expected sqlite file test.db, got %s", cfg.SQLite.File)
	}
	if cfg.SQLite.Init {
		t.Error("expected sqlite init=false")
	}
	if cfg.Socket.Address != "127.0.0.1:6000" {
		t.Errorf("expected socket address 127.0.0.1:6000, got %s", cfg.Socket.Address)
	}
	if cfg.Pulsar.URL != "pulsar://localhost:6650" {
		t.Errorf("expected pulsar url, got %s", cfg.Pulsar.URL)
	}
	if cfg.Pulsar.Topic != "telegrams" {
		t.Errorf("expected pulsar topic telegrams, got %s", cfg.Pulsar.Topic)
	}
	if cfg.Pulsar.Name != "reader" {
		t.Errorf("expected pulsar name reader, got %s", cfg.Pulsar.Name)
	}
	if !cfg.Telegram.TCP {
		t.Error("expected telegram tcp=true")
	}
	if !cfg.Telegram.Pulsar {
		t.Error("expected telegram pulsar=true")
	}
}

func TestLoad_MinimalConfig(t *testing.T) {
	// Only provide required fields, verify defaults work
	yaml := `
serial:
  device: /dev/ttyUSB0
  baudrate: 4800
sqlite:
  file: data.db
socket:
  address: :7000
pulsar:
  url: pulsar://host:6650
  topic: raw
  name: test
`
	path := writeTempConfig(t, yaml)
	cfg, err := Load(path)
	if err != nil {
		t.Fatalf("Load() failed: %v", err)
	}

	if cfg.Serial.Device != "/dev/ttyUSB0" {
		t.Errorf("expected device, got %s", cfg.Serial.Device)
	}
	if cfg.Serial.Baudrate != 4800 {
		t.Errorf("expected baudrate 4800, got %d", cfg.Serial.Baudrate)
	}
	if cfg.Serial.LogRaw {
		t.Error("expected lograw default false")
	}
	if cfg.Telegram.TCP {
		t.Error("expected tcp default false")
	}
	if cfg.Telegram.Pulsar {
		t.Error("expected pulsar default false")
	}
	// Log defaults
	if cfg.Log.Dir != "./logs" {
		t.Errorf("expected log dir ./logs, got %s", cfg.Log.Dir)
	}
	if cfg.Log.MaxAge != 60 {
		t.Errorf("expected max age 60, got %d", cfg.Log.MaxAge)
	}
}

func TestLoad_MissingFile(t *testing.T) {
	cfg, err := Load("/nonexistent/path/config.yaml")
	if err == nil {
		t.Fatal("expected error for missing file, got nil")
	}
	if cfg != nil {
		t.Fatal("expected nil config on error")
	}
}

func TestLoad_PulsarOnlyConfig(t *testing.T) {
	// Verify the exact config from telegram.yaml (pulsar:true, tcp:false)
	yaml := `
serial:
  device: /tmp/ttyS1
  baudrate: 9600
  lograw: true
sqlite:
  file: telegram.db
  init: true
socket:
  address: 127.0.0.1:6000
pulsar:
  url: pulsar://yzjc.gzzn.dev:6650
  topic: telegram-raw
  name: serial-reader
telegram:
  tcp: false
  pulsar: true
`
	path := writeTempConfig(t, yaml)
	cfg, err := Load(path)
	if err != nil {
		t.Fatalf("Load() failed: %v", err)
	}

	if cfg.Telegram.TCP {
		t.Error("expected tcp=false")
	}
	if !cfg.Telegram.Pulsar {
		t.Error("expected pulsar=true")
	}
	if cfg.SQLite.File != "telegram.db" {
		t.Errorf("expected db file telegram.db, got %s", cfg.SQLite.File)
	}
}

func TestLoad_DefaultLogValues(t *testing.T) {
	yaml := `
serial:
  device: /tmp/ttyS0
  baudrate: 9600
sqlite:
  file: test.db
socket:
  address: :6000
pulsar:
  url: pulsar://localhost:6650
  topic: t
  name: n
`
	path := writeTempConfig(t, yaml)
	cfg, err := Load(path)
	if err != nil {
		t.Fatalf("Load() failed: %v", err)
	}

	if cfg.Log.Dir != "./logs" {
		t.Errorf("expected log dir ./logs, got %q", cfg.Log.Dir)
	}
	if cfg.Log.MaxAge != 60 {
		t.Errorf("expected log max age 60, got %d", cfg.Log.MaxAge)
	}
	if cfg.Log.RotateHour != 1 {
		t.Errorf("expected log rotate hour 1, got %d", cfg.Log.RotateHour)
	}
}