package config

import (
	"fmt"
	"os"

	"gopkg.in/yaml.v3"
)

// Load runs one orchestration or CLI step.
// Signature: Load(path string) (Config, error).
// Why: keeps behavior explicit so startup/shutdown workflows remain maintainable as services evolve.
func Load(path string) (Config, error) {
	cfg := defaults()

	b, err := os.ReadFile(path)
	if err != nil {
		return Config{}, fmt.Errorf("read config %s: %w", path, err)
	}
	if err := yaml.Unmarshal(b, &cfg); err != nil {
		return Config{}, fmt.Errorf("decode config %s: %w", path, err)
	}

	cfg.applyDefaults()
	if err := cfg.Validate(); err != nil {
		return Config{}, err
	}
	return cfg, nil
}