package app

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

func loadTransportPolicyCompilePlan() TransportPolicyCompilePlan {
	var plan TransportPolicyCompilePlan
	data, err := os.ReadFile(transportPolicyPlanStatePath)
	if err != nil {
		return plan
	}
	if err := json.Unmarshal(data, &plan); err != nil {
		return TransportPolicyCompilePlan{}
	}
	if plan.Interfaces == nil {
		plan.Interfaces = nil
	}
	return plan
}

func saveTransportPolicyCompilePlan(plan TransportPolicyCompilePlan) error {
	if strings.TrimSpace(plan.GeneratedAt) == "" {
		plan.GeneratedAt = time.Now().UTC().Format(time.RFC3339)
	}
	data, err := json.MarshalIndent(plan, "", "  ")
	if err != nil {
		return err
	}
	if err := os.MkdirAll(filepath.Dir(transportPolicyPlanStatePath), 0o755); err != nil {
		return err
	}
	tmp := transportPolicyPlanStatePath + ".tmp"
	if err := os.WriteFile(tmp, data, 0o644); err != nil {
		return err
	}
	return os.Rename(tmp, transportPolicyPlanStatePath)
}