// Package config contains ServiceConfig, which is intended
// to extend go-app/pkg/config.AppConfig. Add any custom fields
// here, and it will automatically be handled by go-app, including
// overrides by environment, and json schema generation
package config

import (
	"time"

	"github.com/caarlos0/env/v11"

	"gitea.libretechconsulting.com/rmcguire/go-app/pkg/config"
)

// DefaultUsageInterval is used when UsageInterval is unset. Rheem's
// energy/water history only updates hourly, so polling faster is wasteful.
const DefaultUsageInterval = 5 * time.Minute

type ServiceConfig struct {
	// Rheem EcoNet cloud credentials. Prefer supplying the password via
	// the ECONET_PASSWORD environment variable rather than config.yaml.
	EconetEmail    string `yaml:"econetEmail"    json:"econetEmail,omitempty"    env:"ECONET_EMAIL"`
	EconetPassword string `yaml:"econetPassword" json:"econetPassword,omitempty" env:"ECONET_PASSWORD"`

	// CostPerKWH is the electricity price in US dollars per kWh (e.g. 0.18
	// means 18 cents/kWh, NOT 18). It derives the econet_energy_cost_dollars
	// metric from kWh energy usage.
	CostPerKWH float64 `yaml:"costPerKWH" json:"costPerKWH,omitempty" env:"ECONET_COST_PER_KWH"`

	// UsageInterval controls how often energy/water usage history is polled.
	UsageInterval time.Duration `yaml:"usageInterval" json:"usageInterval,omitempty" env:"ECONET_USAGE_INTERVAL"`

	// Embeds go-app config, used by go-app to
	// merge custom config into go-app config, and to produce
	// a complete configuration json schema
	*config.AppConfig
}

// LoadEnv applies environment-variable overrides to the custom ServiceConfig
// fields. go-app's MustLoadConfigInto only handles env for the embedded
// AppConfig, so the caller must apply env for custom fields. The embedded
// AppConfig is skipped here to preserve go-app's own env/yaml precedence.
func (c *ServiceConfig) LoadEnv() error {
	appConfig := c.AppConfig
	c.AppConfig = nil
	defer func() { c.AppConfig = appConfig }()
	return env.Parse(c)
}

// GetUsageInterval returns the configured usage poll interval or the default.
func (c *ServiceConfig) GetUsageInterval() time.Duration {
	if c.UsageInterval <= 0 {
		return DefaultUsageInterval
	}
	return c.UsageInterval
}