//
//  WeatherKitConditionCoding.swift
//  iris
//
//  Created by Codex.
//

import Foundation
import WeatherKit

extension WeatherKit.WeatherCondition {
    func irisScreamingCase() -> String {
        Self.upperSnake(from: rawValue)
    }

    static func irisDecode(_ value: String) -> WeatherKit.WeatherCondition? {
        let trimmed = value.trimmingCharacters(in: .whitespacesAndNewlines)
        guard !trimmed.isEmpty else { return nil }
        if trimmed.uppercased() == "UNKNOWN" { return nil }

        if let direct = WeatherKit.WeatherCondition(rawValue: trimmed) { return direct }

        let lowerCamel = lowerCamel(fromScreamingOrSnake: trimmed)
        if let mapped = WeatherKit.WeatherCondition(rawValue: lowerCamel) { return mapped }

        return nil
    }

    private static func upperSnake(from value: String) -> String {
        var out = ""
        out.reserveCapacity(value.count + 8)
        for scalar in value.unicodeScalars {
            if CharacterSet.uppercaseLetters.contains(scalar), !out.isEmpty {
                out.append("_")
            }
            out.append(String(scalar).uppercased())
        }
        return out
    }

    private static func lowerCamel(fromScreamingOrSnake value: String) -> String {
        let parts = value
            .split(separator: "_")
            .map { $0.lowercased() }
        guard let first = parts.first else { return value }
        let rest = parts.dropFirst().map { $0.prefix(1).uppercased() + $0.dropFirst() }
        return ([String(first)] + rest).joined()
    }
}