package app

import (
	"encoding/json"
	"os"
	"path/filepath"
	"time"
)

func loadTransportOwnershipState() TransportOwnershipState {
	st := TransportOwnershipState{Version: transportStateVersion}
	data, err := os.ReadFile(transportOwnershipStatePath)
	if err != nil {
		return st
	}
	if err := json.Unmarshal(data, &st); err != nil {
		return TransportOwnershipState{Version: transportStateVersion}
	}
	if st.Version == 0 {
		st.Version = transportStateVersion
	}
	if st.Items == nil {
		st.Items = nil
	}
	st.Count = len(st.Items)
	return st
}

func saveTransportOwnershipState(st TransportOwnershipState) error {
	st.Version = transportStateVersion
	st.UpdatedAt = time.Now().UTC().Format(time.RFC3339)
	st.Count = len(st.Items)

	data, err := json.MarshalIndent(st, "", "  ")
	if err != nil {
		return err
	}
	if err := os.MkdirAll(filepath.Dir(transportOwnershipStatePath), 0o755); err != nil {
		return err
	}
	tmp := transportOwnershipStatePath + ".tmp"
	if err := os.WriteFile(tmp, data, 0o644); err != nil {
		return err
	}
	return os.Rename(tmp, transportOwnershipStatePath)
}