package main

import (
	"os"
	"time"

	"gopkg.in/yaml.v3"
)

type Config struct {
	ListenAddr string         `yaml:"listen_addr"`
	Defaults   TargetSettings `yaml:"defaults"`
	Targets    []TargetConfig `yaml:"targets"`
}

type TargetSettings struct {
	Interval    time.Duration `yaml:"interval"`
	Timeout     time.Duration `yaml:"timeout"`
	Size        int           `yaml:"size"`
	HistorySize int           `yaml:"history_size"`
	DNSServer   string        `yaml:"dns_server"`
	DisableIPv6 bool          `yaml:"disable_ipv6"`
}

type TargetConfig struct {
	Name string `yaml:"name"`
	Host string `yaml:"host"`

	// optional overrides
	Interval    *time.Duration `yaml:"interval"`
	Timeout     *time.Duration `yaml:"timeout"`
	Size        *int           `yaml:"size"`
	HistorySize *int           `yaml:"history_size"`
	DNSServer   *string        `yaml:"dns_server"`
	DisableIPv6 *bool          `yaml:"disable_ipv6"`
}

func LoadConfig(path string) (*Config, error) {
	b, err := os.ReadFile(path)
	if err != nil {
		return nil, err
	}
	var cfg Config
	if err := yaml.Unmarshal(b, &cfg); err != nil {
		return nil, err
	}

	// defaults setzen, falls nicht da
	if cfg.ListenAddr == "" {
		cfg.ListenAddr = ":9101"
	}
	if cfg.Defaults.Interval == 0 {
		cfg.Defaults.Interval = 5 * time.Second
	}
	if cfg.Defaults.Timeout == 0 {
		cfg.Defaults.Timeout = 1 * time.Second
	}
	if cfg.Defaults.Size == 0 {
		cfg.Defaults.Size = 56
	}
	if cfg.Defaults.HistorySize == 0 {
		cfg.Defaults.HistorySize = 10
	}

	return &cfg, nil
}