82 lines
2.4 KiB
Swift
82 lines
2.4 KiB
Swift
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//
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// HeuristicRanker.swift
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// iris
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//
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// Created by Codex.
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//
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import Foundation
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struct UserContext: Equatable {
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var isMoving: Bool
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var city: String
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init(isMoving: Bool, city: String = "London") {
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self.isMoving = isMoving
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self.city = city
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}
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}
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final class HeuristicRanker {
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private let nowProvider: () -> Int
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private let lastShownAtProvider: (String) -> Int?
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init(now: @escaping () -> Int = { Int(Date().timeIntervalSince1970) },
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lastShownAt: @escaping (String) -> Int? = { _ in nil }) {
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self.nowProvider = now
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self.lastShownAtProvider = lastShownAt
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}
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func pickWinner(from candidates: [Candidate], now: Int? = nil, context: UserContext) -> Winner {
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let currentTime = now ?? nowProvider()
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let valid = candidates
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.filter { !$0.isExpired(at: currentTime) }
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.filter { $0.confidence >= 0.0 }
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guard !valid.isEmpty else {
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return WinnerEnvelope.allQuiet(now: currentTime).winner
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}
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var best: (candidate: Candidate, score: Double)?
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for candidate in valid {
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let baseWeight = baseWeight(for: candidate.type)
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var score = baseWeight * min(max(candidate.confidence, 0.0), 1.0)
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if let shownAt = lastShownAtProvider(candidate.id),
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currentTime - shownAt <= 2 * 60 * 60 {
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score -= 0.4
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}
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if best == nil || score > best!.score {
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best = (candidate, score)
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}
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}
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guard let best else {
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return WinnerEnvelope.allQuiet(now: currentTime).winner
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}
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let priority = min(max(best.score, 0.0), 1.0)
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return Winner(
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id: best.candidate.id,
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type: best.candidate.type,
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title: best.candidate.title.truncated(maxLength: TextConstraints.titleMax),
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subtitle: best.candidate.subtitle.truncated(maxLength: TextConstraints.subtitleMax),
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priority: priority,
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ttlSec: max(1, best.candidate.ttlSec)
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)
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}
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private func baseWeight(for type: WinnerType) -> Double {
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switch type {
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case .weatherWarning: return 1.0
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case .weatherAlert: return 0.9
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case .transit: return 0.75
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case .poiNearby: return 0.6
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case .info: return 0.4
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case .nowPlaying: return 0.25
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case .currentWeather: return 0.0
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case .allQuiet: return 0.0
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}
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}
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}
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