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//
// AllLocationDataSource.swift
// MullvadVPN
//
// Created by Jon Petersson on 2024-02-22.
// Copyright © 2025 Mullvad VPN AB. All rights reserved.
//
import Foundation
import MullvadREST
import MullvadTypes
class AllLocationDataSource: LocationDataSourceProtocol {
private(set) var nodes = [LocationNode]()
var searchableNodes: [LocationNode] {
nodes
}
/// Constructs a collection of node trees from relays fetched from the API.
/// ``RelayLocation.city`` is of special import since we use it to get country
/// and city names.
func reload(_ relays: LocationRelays) {
let rootNode = RootLocationNode()
let expandedRelays = nodes.flatMap { [$0] + $0.flattened }.filter { $0.showsChildren }.map { $0.code }
for relay in relays.relays {
guard
let serverLocation = relays.locations[relay.location.rawValue]
else { continue }
let relayLocation = RelayLocation.hostname(
String(relay.location.country),
String(relay.location.city),
relay.hostname
)
for ancestorOrSelf in relayLocation.ancestors + [relayLocation] {
addLocation(
ancestorOrSelf,
rootNode: rootNode,
serverLocation: serverLocation,
relay: relay,
showsChildren: expandedRelays.contains(ancestorOrSelf.stringRepresentation)
)
}
}
nodes = rootNode.children
}
func node(by location: RelayLocation) -> LocationNode? {
let rootNode = RootLocationNode(children: nodes)
return switch location {
case let .country(countryCode):
rootNode.descendantNodeFor(codes: [countryCode])
case let .city(countryCode, cityCode):
rootNode.descendantNodeFor(codes: [countryCode, cityCode])
case let .hostname(_, _, hostCode):
rootNode.descendantNodeFor(codes: [hostCode])
}
}
private func addLocation(
_ location: RelayLocation,
rootNode: LocationNode,
serverLocation: REST.ServerLocation,
relay: REST.ServerRelay,
showsChildren: Bool
) {
switch location {
case let .country(countryCode):
let countryNode = LocationNode(
name: serverLocation.country,
code: LocationNode.combineNodeCodes([countryCode]),
locations: [location],
isActive: true, // Defaults to true, updated when children are populated.
showsChildren: showsChildren
)
if !rootNode.children.contains(countryNode) {
rootNode.children.append(countryNode)
rootNode.children.sort()
}
case let .city(countryCode, cityCode):
let cityNode = LocationNode(
name: serverLocation.city,
code: LocationNode.combineNodeCodes([countryCode, cityCode]),
locations: [location],
isActive: true, // Defaults to true, updated when children are populated.
showsChildren: showsChildren
)
if let countryNode = rootNode.countryFor(code: countryCode),
!countryNode.children.contains(cityNode)
{
cityNode.parent = countryNode
countryNode.children.append(cityNode)
countryNode.children.sort()
}
case let .hostname(countryCode, cityCode, hostCode):
let hostNode = LocationNode(
name: relay.hostname,
code: LocationNode.combineNodeCodes([hostCode]),
locations: [location],
isActive: relay.active,
showsChildren: showsChildren
)
if let countryNode = rootNode.countryFor(code: countryCode),
let cityNode = countryNode.cityFor(codes: [countryCode, cityCode]),
!cityNode.children.contains(hostNode)
{
hostNode.parent = cityNode
cityNode.children.append(hostNode)
cityNode.children.sort()
cityNode.isActive = cityNode.children.contains(where: { hostNode in
hostNode.isActive
})
countryNode.isActive = countryNode.children.contains(where: { cityNode in
cityNode.isActive
})
}
}
}
}
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