package config

import (
	"fmt"
	"os"
	"strconv"

	c "github.com/juanatsap/cv-site/internal/constants"
)

// Config holds all application configuration
type Config struct {
	Server   ServerConfig
	Template TemplateConfig
	Data     DataConfig
	Email    EmailConfig
}

// ServerConfig contains server-specific settings
type ServerConfig struct {
	Port         string
	Host         string
	ReadTimeout  int
	WriteTimeout int
}

// TemplateConfig contains template-specific settings
type TemplateConfig struct {
	Dir         string
	PartialsDir string
	HotReload   bool
}

// DataConfig contains data directory settings
type DataConfig struct {
	Dir string
}

// EmailConfig contains email/SMTP settings
type EmailConfig struct {
	SMTPHost     string
	SMTPPort     string
	SMTPUser     string
	SMTPPassword string
	FromEmail    string
	ContactEmail string
}

// Load creates a new Config with values from environment or defaults
func Load() *Config {
	return &Config{
		Server: ServerConfig{
			Port:         getEnv(c.EnvVarPort, c.DefaultPort),
			Host:         getEnv("HOST", "localhost"),
			ReadTimeout:  getEnvAsInt("READ_TIMEOUT", 15),
			WriteTimeout: getEnvAsInt("WRITE_TIMEOUT", 15),
		},
		Template: TemplateConfig{
			Dir:         getEnv("TEMPLATE_DIR", c.DirTemplates),
			PartialsDir: getEnv("PARTIALS_DIR", c.DirPartials),
			HotReload:   getEnvAsBool("TEMPLATE_HOT_RELOAD", isDevelopment()),
		},
		Data: DataConfig{
			Dir: getEnv("DATA_DIR", c.DirData),
		},
		Email: EmailConfig{
			SMTPHost:     getEnv("SMTP_HOST", "smtp.gmail.com"),
			SMTPPort:     getEnv("SMTP_PORT", "587"),
			SMTPUser:     getEnv("SMTP_USER", ""),
			SMTPPassword: getEnv("SMTP_PASSWORD", ""),
			FromEmail:    getEnv("SMTP_FROM_EMAIL", ""),
			ContactEmail: getEnv("CONTACT_EMAIL", "txeo.msx@gmail.com"),
		},
	}
}

// Address returns the server address in host:port format
func (c *Config) Address() string {
	return fmt.Sprintf("%s:%s", c.Server.Host, c.Server.Port)
}

// Helper functions

func getEnv(key, defaultValue string) string {
	if value := os.Getenv(key); value != "" {
		return value
	}
	return defaultValue
}

func getEnvAsInt(key string, defaultValue int) int {
	valueStr := os.Getenv(key)
	if value, err := strconv.Atoi(valueStr); err == nil {
		return value
	}
	return defaultValue
}

func getEnvAsBool(key string, defaultValue bool) bool {
	valueStr := os.Getenv(key)
	if value, err := strconv.ParseBool(valueStr); err == nil {
		return value
	}
	return defaultValue
}

func isDevelopment() bool {
	env := getEnv(c.EnvVarGOEnv, c.EnvDevelopment)
	return env == c.EnvDevelopment || env == "dev"
}