module site

import json

// Top-level config
pub struct SideBar {
pub mut:
	my_sidebar []NavItem
}

// -------- Variant Type --------
pub type NavItem = NavDoc | NavCat | NavLink

// --------- DOC ITEM ----------
pub struct NavDoc {
pub:
	id    string // is the page id
	label string
}

// --------- CATEGORY ----------
pub struct NavCat {
pub mut:
	label       string
	collapsible bool
	collapsed   bool
	items       []NavItem
}

// --------- LINK ----------
pub struct NavLink {
pub:
	label       string
	href        string
	description string
}

// -------- JSON SERIALIZATION --------

// NavItemJson is used for JSON export with type discrimination
pub struct NavItemJson {
pub mut:
	type_field string @[json: 'type']
	// For doc
	id    string @[omitempty]
	label string @[omitempty]
	// For link
	href        string @[omitempty]
	description string @[omitempty]
	// For category
	collapsible bool
	collapsed   bool
	items       []NavItemJson @[omitempty]
}

// Convert a single NavItem to JSON-serializable format
fn nav_item_to_json(item NavItem) !NavItemJson {
	return match item {
		NavDoc {
			NavItemJson{
				type_field:  'doc'
				id:          item.id
				label:       item.label
				collapsible: false
				collapsed:   false
			}
		}
		NavLink {
			NavItemJson{
				type_field:  'link'
				label:       item.label
				href:        item.href
				description: item.description
				collapsible: false
				collapsed:   false
			}
		}
		NavCat {
			mut json_items := []NavItemJson{}
			for sub_item in item.items {
				json_items << nav_item_to_json(sub_item)!
			}
			NavItemJson{
				type_field:  'category'
				label:       item.label
				collapsible: item.collapsible
				collapsed:   item.collapsed
				items:       json_items
			}
		}
	}
}

// Convert entire NavConfig sidebar to JSON string
pub fn (nc SideBar) sidebar_to_json() !string {
	mut result := []NavItemJson{}
	for item in nc.my_sidebar {
		result << nav_item_to_json(item)!
	}
	return json.encode_pretty(result)
}