package config

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

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"gopkg.in/yaml.v3"
)

func TestLoadDesktopConfigAtPath_WithMetadata(t *testing.T) {
	dir := t.TempDir()
	configPath := filepath.Join(dir, "config.yaml")

	cfg := DefaultConfig()
	cfg.Server.Port = 8888
	data, err := yaml.Marshal(cfg)
	require.NoError(t, err)
	require.NoError(t, os.WriteFile(configPath, data, 0o600))

	loaded, meta, err := loadConfigWithMetadata(loadOptions{
		configPathOverride: configPath,
		useCLI:             false,
		useEnv:             false,
		useConfigFlag:      false,
	})
	require.NoError(t, err)
	assert.Equal(t, 8888, loaded.Server.Port)
	assert.Equal(t, configPath, meta.ConfigPath)
}

func TestSaveConfigToPath(t *testing.T) {
	dir := t.TempDir()
	configPath := filepath.Join(dir, "sub", "config.yaml")

	cfg := DefaultConfig()
	cfg.Server.Port = 7777

	err := SaveConfigToPath(cfg, configPath)
	require.NoError(t, err)

	data, err := os.ReadFile(configPath)
	require.NoError(t, err)
	assert.Contains(t, string(data), "7777")
}

func TestSaveConfigToPath_InvalidDir(t *testing.T) {
	cfg := DefaultConfig()
	err := SaveConfigToPath(cfg, "/dev/null/impossible/config.yaml")
	assert.Error(t, err)
}

func TestDurationConversion(t *testing.T) {
	cfg := DefaultConfig()
	dto := configToDTO(cfg)

	parsed, err := time.ParseDuration(dto.Server.ReadTimeout)
	require.NoError(t, err)
	assert.Equal(t, cfg.Server.ReadTimeout, parsed)

	parsed, err = time.ParseDuration(dto.Database.ConnMaxLifetime)
	require.NoError(t, err)
	assert.Equal(t, cfg.Database.ConnMaxLifetime, parsed)
}

func TestSaveConfigToPath_DurationFormat(t *testing.T) {
	dir := t.TempDir()
	configPath := filepath.Join(dir, "config.yaml")

	cfg := DefaultConfig()
	cfg.Server.ReadTimeout = 30 * time.Second
	cfg.Server.WriteTimeout = 1 * time.Minute
	cfg.Database.ConnMaxLifetime = 1 * time.Hour

	err := SaveConfigToPath(cfg, configPath)
	require.NoError(t, err)

	data, err := os.ReadFile(configPath)
	require.NoError(t, err)
	content := string(data)
	assert.Contains(t, content, "conn_max_lifetime: 1h0m0s")
	assert.Contains(t, content, "read_timeout: 30s")
	assert.Contains(t, content, "write_timeout: 1m0s")
}

func TestSaveAndReload_DurationRoundTrip(t *testing.T) {
	dir := t.TempDir()
	configPath := filepath.Join(dir, "config.yaml")

	yamlContent := `
server:
  port: 9826
  read_timeout: 30s
  write_timeout: 1m
database:
  driver: sqlite
  path: ` + filepath.Join(dir, "test.db") + `
  max_idle_conns: 10
  max_open_conns: 100
  conn_max_lifetime: 30m
log:
  level: info
  path: ` + filepath.Join(dir, "log") + `
  max_size: 100
  max_backups: 10
  max_age: 30
  compress: true
`
	require.NoError(t, os.WriteFile(configPath, []byte(yamlContent), 0o600))

	cfg, err := LoadDesktopConfigAtPath(configPath)
	require.NoError(t, err)
	assert.Equal(t, 30*time.Minute, cfg.Database.ConnMaxLifetime)

	err = SaveConfigToPath(cfg, configPath)
	require.NoError(t, err)

	data, err := os.ReadFile(configPath)
	require.NoError(t, err)
	assert.Contains(t, string(data), "conn_max_lifetime: 30m0s")
}

func configToDTO(c *Config) struct {
	Server struct {
		Port         int    `json:"port"`
		ReadTimeout  string `json:"read_timeout"`
		WriteTimeout string `json:"write_timeout"`
	}
	Database struct {
		ConnMaxLifetime string `json:"conn_max_lifetime"`
	}
} {
	var result struct {
		Server struct {
			Port         int    `json:"port"`
			ReadTimeout  string `json:"read_timeout"`
			WriteTimeout string `json:"write_timeout"`
		}
		Database struct {
			ConnMaxLifetime string `json:"conn_max_lifetime"`
		}
	}
	result.Server.Port = c.Server.Port
	result.Server.ReadTimeout = c.Server.ReadTimeout.String()
	result.Server.WriteTimeout = c.Server.WriteTimeout.String()
	result.Database.ConnMaxLifetime = c.Database.ConnMaxLifetime.String()
	return result
}