package config

import (
	"fmt"

	"gopkg.in/yaml.v3"
)

// UnmarshalYAML tracks explicit normalize.output_path presence so validation can
// distinguish omitted vs explicitly empty values.
func (cfg *NormalizeConfig) UnmarshalYAML(node *yaml.Node) error {
	if node.Kind != yaml.MappingNode {
		return fmt.Errorf("normalize must be a mapping")
	}
	allowedKeys := map[string]struct{}{
		"output_path":   {},
		"output_schema": {},
		"report":        {},
	}
	for i := 0; i+1 < len(node.Content); i += 2 {
		key := node.Content[i].Value
		if _, ok := allowedKeys[key]; !ok {
			return fmt.Errorf("field %q not found in type config.NormalizeConfig", key)
		}
	}

	type rawNormalize NormalizeConfig
	var raw rawNormalize
	if err := node.Decode(&raw); err != nil {
		return err
	}
	*cfg = NormalizeConfig(raw)
	for i := 0; i+1 < len(node.Content); i += 2 {
		if node.Content[i].Value == "output_path" {
			cfg.outputPathSet = true
			break
		}
	}
	return nil
}

// outputPathSet records whether normalize.output_path appeared in YAML.
// This is intentionally unexported and not serialized.
func (cfg *NormalizeConfig) outputPathWasSet() bool {
	if cfg == nil {
		return false
	}
	return cfg.outputPathSet
}