package files

import (
	"errors"
	"fmt"
	"os"
	"path/filepath"

	"gopkg.in/ini.v1"
)

func (s *Source) lazyLoadAmneziawgConf() AmneziawgConfig {
	if s.cached.amneziawgLoaded {
		return s.cached.amneziawgConf
	}

	s.cached.amneziawgLoaded = true
	var err error
	s.cached.amneziawgConf, err = ParseAmneziawgConf(filepath.Join(s.rootDirectory, "amneziawg", "awg0.conf"))
	if err != nil {
		s.warner.Warnf("skipping Amneziawg config: %s", err)
	}
	return s.cached.amneziawgConf
}

type AmneziawgConfig struct {
	Wireguard WireguardConfig
	Jc        *string
	Jmin      *string
	Jmax      *string
	S1        *string
	S2        *string
	S3        *string
	S4        *string
	H1        *string
	H2        *string
	H3        *string
	H4        *string
	I1        *string
	I2        *string
	I3        *string
	I4        *string
	I5        *string
}

func ParseAmneziawgConf(path string) (config AmneziawgConfig, err error) {
	iniFile, err := ini.InsensitiveLoad(path)
	if err != nil {
		if errors.Is(err, os.ErrNotExist) {
			return AmneziawgConfig{}, nil
		}
		return AmneziawgConfig{}, fmt.Errorf("loading ini from reader: %w", err)
	}

	config.Wireguard, err = ParseWireguardConf(path)
	if err != nil {
		return AmneziawgConfig{}, err
	}

	interfaceSection, err := iniFile.GetSection("Interface")
	if err != nil {
		// can never happen
		return AmneziawgConfig{}, fmt.Errorf("getting interface section: %w", err)
	}

	config.Jc = getINIKeyFromSection(interfaceSection, "Jc")
	config.Jmin = getINIKeyFromSection(interfaceSection, "Jmin")
	config.Jmax = getINIKeyFromSection(interfaceSection, "Jmax")
	config.S1 = getINIKeyFromSection(interfaceSection, "S1")
	config.S2 = getINIKeyFromSection(interfaceSection, "S2")
	config.S3 = getINIKeyFromSection(interfaceSection, "S3")
	config.S4 = getINIKeyFromSection(interfaceSection, "S4")
	config.H1 = getINIKeyFromSection(interfaceSection, "H1")
	config.H2 = getINIKeyFromSection(interfaceSection, "H2")
	config.H3 = getINIKeyFromSection(interfaceSection, "H3")
	config.H4 = getINIKeyFromSection(interfaceSection, "H4")
	config.I1 = getINIKeyFromSection(interfaceSection, "I1")
	config.I2 = getINIKeyFromSection(interfaceSection, "I2")
	config.I3 = getINIKeyFromSection(interfaceSection, "I3")
	config.I4 = getINIKeyFromSection(interfaceSection, "I4")
	config.I5 = getINIKeyFromSection(interfaceSection, "I5")

	return config, nil
}