package main

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

// ================== Stato locale (anti-doppio ordine) ==================

type Lock struct {
	TS         time.Time `json:"ts"`
	From       string    `json:"from"`
	To         string    `json:"to"`
	AmountFrom float64   `json:"amount_from"`
	Status     string    `json:"status"` // pending/confirmed/cancelled
}
type PortfolioState struct {
	Version   int                `json:"version"`
	UpdatedAt time.Time          `json:"updated_at"`
	Balances  map[string]float64 `json:"balances"`
	Locks     []Lock             `json:"locks"`
}

func loadState(path string) (PortfolioState, error) {
	b, err := os.ReadFile(path)
	if errors.Is(err, os.ErrNotExist) {
		return PortfolioState{Version: 1, UpdatedAt: time.Now().UTC(), Balances: map[string]float64{}, Locks: []Lock{}}, nil
	}
	if err != nil {
		return PortfolioState{}, err
	}
	var s PortfolioState
	if err := json.Unmarshal(b, &s); err != nil {
		return PortfolioState{}, err
	}
	return s, nil
}

func saveState(path string, s PortfolioState) error {
	s.UpdatedAt = time.Now().UTC()
	if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
		return err
	}
	b, _ := json.Marshal(s)
	return os.WriteFile(path, b, 0o644)
}

func assetShort(label string) string {
	parts := strings.Split(label, ".")
	if len(parts) != 2 {
		return label
	}
	right := parts[1]
	if i := strings.Index(right, "-"); i > 0 {
		right = right[:i]
	}
	return parts[0] + "." + right
}