package ownwire_sdk

import (
	"fmt"
	"strconv"
	"strings"
)

type SessionInit struct {
	SessionId       string
	ServerPubKeyB64 string
	SaltB64         string
	SeqOut          uint64
	SeqInMax        uint64
}

// ParseSessionInit parses:
// "/session:<id>:<server_pubkey_b64>:<salt_b64>:<seq_out>:<seq_in_max>"
func ParseSessionInit(line string) (SessionInit, error) {
	if !strings.HasPrefix(line, "/session:") {
		return SessionInit{}, fmt.Errorf("invalid session line prefix: %q", line)
	}

	parts := strings.Split(line, ":")
	if len(parts) < 6 || parts[0] != "/session" {
		return SessionInit{}, fmt.Errorf("invalid session line: %q", line)
	}

	seq_out, err := strconv.ParseUint(parts[4], 10, 64)
	if err != nil {
		return SessionInit{}, fmt.Errorf("invalid seq_out: %w", err)
	}

	seq_in_max, err := strconv.ParseUint(parts[5], 10, 64)
	if err != nil {
		return SessionInit{}, fmt.Errorf("invalid seq_in_max: %w", err)
	}

	out := SessionInit{
		SessionId:       parts[1],
		ServerPubKeyB64: parts[2],
		SaltB64:         parts[3],
		SeqOut:          seq_out,
		SeqInMax:        seq_in_max,
	}
	return out, nil
}