// Package glossary derives consumer views from resolved configuration.
package glossary

import "gitea.maximumdirect.net/eric/audita/v3/internal/core/config"

// Entry is the known glossary content and its collection-scoped identity.
type Entry struct {
	Collection  string   `json:"-"`
	ID          string   `json:"id"`
	Name        string   `json:"name"`
	Category    string   `json:"category"`
	Description string   `json:"description,omitempty"`
	Aliases     []string `json:"aliases,omitempty"`
	Plural      *string  `json:"plural,omitempty"`
}

type identity struct{ collection, id string }

// Select retains the first occurrence of each selected collection entry.
func Select(collections map[string]config.GlossaryCollection, names []string) []Entry {
	seen := make(map[identity]struct{})
	var selected []Entry
	for _, name := range names {
		for _, item := range collections[name].Entries {
			key := identity{collection: name, id: item.ID}
			if _, exists := seen[key]; exists {
				continue
			}
			seen[key] = struct{}{}
			entry := Entry{Collection: name, ID: item.ID, Name: item.Name, Category: item.Category, Description: item.Description, Aliases: append([]string(nil), item.Aliases...)}
			if item.Plural != nil {
				plural := *item.Plural
				entry.Plural = &plural
			}
			selected = append(selected, entry)
		}
	}
	return selected
}