package config

import (
	"errors"
	"io"
	"os"

	yaml "gopkg.in/yaml.v3"
)

type Contract struct {
	Network      string `yaml:"network"`
	Address      string `yaml:"address"`
	MaxTokenId   string `yaml:"max_token_id"`
	FromBlock    string `yaml:"from_block"` // kept for backward compatibility, maps to MaxTokenId
}

type File struct {
	Contracts map[string]Contract `yaml:"contracts"`
}

func Load(path string) (*File, error) {
	if path == "" { return &File{Contracts: map[string]Contract{}}, nil }
	f, err := os.Open(path)
	if err != nil { return nil, err }
	defer f.Close()
	b, err := io.ReadAll(f)
	if err != nil { return nil, err }
	var cfg File
	if err := yaml.Unmarshal(b, &cfg); err != nil { return nil, err }
	if cfg.Contracts == nil { cfg.Contracts = map[string]Contract{} }
	return &cfg, nil
}

func (f *File) Get(name string) (Contract, bool) {
	c, ok := f.Contracts[name]
	return c, ok
}

func (c Contract) Validate() error {
	if c.Network == "" || c.Address == "" { return errors.New("missing network or address") }
	return nil
}