//
//  Extensions.swift
//  Werkout_ios
//
//  Created by Trey Tartt on 6/20/23.
//

import Foundation
import UIKit
import SwiftUI

private enum DateFormatterCache {
    static let lock = NSLock()

    static let serverDateFormatter: DateFormatter = {
        let formatter = DateFormatter()
        formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ssX"
        formatter.locale = Locale(identifier: "en_US_POSIX")
        return formatter
    }()

    static let plannedDateFormatter: DateFormatter = {
        let formatter = DateFormatter()
        formatter.dateFormat = "yyyy-MM-dd"
        formatter.locale = Locale(identifier: "en_US_POSIX")
        return formatter
    }()

    static let weekDayFormatter: DateFormatter = {
        let formatter = DateFormatter()
        formatter.dateFormat = "EEE"
        formatter.locale = Locale(identifier: "en_US_POSIX")
        return formatter
    }()

    static let monthFormatter: DateFormatter = {
        let formatter = DateFormatter()
        formatter.dateFormat = "MMM"
        formatter.locale = Locale(identifier: "en_US_POSIX")
        return formatter
    }()

    static let dayFormatter: DateFormatter = {
        let formatter = DateFormatter()
        formatter.dateFormat = "d"
        formatter.locale = Locale(identifier: "en_US_POSIX")
        return formatter
    }()

    static func withLock<T>(_ block: () -> T) -> T {
        lock.lock()
        defer { lock.unlock() }
        return block()
    }
}

private enum DurationFormatterCache {
    static let lock = NSLock()
    static let formatter: DateComponentsFormatter = {
        let formatter = DateComponentsFormatter()
        formatter.allowedUnits = [.hour, .minute, .second, .nanosecond]
        return formatter
    }()

    static func string(from seconds: Double, style: DateComponentsFormatter.UnitsStyle) -> String {
        lock.lock()
        defer { lock.unlock() }
        formatter.unitsStyle = style
        return formatter.string(from: seconds) ?? ""
    }
}

extension Dictionary {
    func percentEncoded() -> Data? {
        map { key, value in
            let escapedKey = "\(key)".addingPercentEncoding(withAllowedCharacters: .urlQueryValueAllowed) ?? ""
            let escapedValue = "\(value)".addingPercentEncoding(withAllowedCharacters: .urlQueryValueAllowed) ?? ""
            return escapedKey + "=" + escapedValue
        }
        .joined(separator: "&")
        .data(using: .utf8)
    }
}

extension CharacterSet {
    static let urlQueryValueAllowed: CharacterSet = {
        let generalDelimitersToEncode = ":#[]@" // does not include "?" or "/" due to RFC 3986 - Section 3.4
        let subDelimitersToEncode = "!$&'()*+,;="
        
        var allowed: CharacterSet = .urlQueryAllowed
        allowed.remove(charactersIn: "\(generalDelimitersToEncode)\(subDelimitersToEncode)")
        return allowed
    }()
}

extension Date {
    var timeFormatForUpload: String {
        DateFormatterCache.withLock {
            DateFormatterCache.serverDateFormatter.string(from: self)
        }
    }
}

extension String {
    var dateFromServerDate: Date? {
        DateFormatterCache.withLock {
            DateFormatterCache.serverDateFormatter.date(from: self)
        }
    }
    
    var plannedDate: Date? {
        DateFormatterCache.withLock {
            DateFormatterCache.plannedDateFormatter.date(from: self)
        }
    }
}

extension Date {
    func get(_ components: Calendar.Component..., calendar: Calendar = Calendar.current) -> DateComponents {
        return calendar.dateComponents(Set(components), from: self)
    }
    
    func get(_ component: Calendar.Component, calendar: Calendar = Calendar.current) -> Int {
        return calendar.component(component, from: self)
    }
    
    var formatForPlannedWorkout: String {
        DateFormatterCache.withLock {
            DateFormatterCache.plannedDateFormatter.string(from: self)
        }
    }
    
    var weekDay: String {
        DateFormatterCache.withLock {
            DateFormatterCache.weekDayFormatter.string(from: self)
        }
    }
    
    var monthString: String {
        DateFormatterCache.withLock {
            DateFormatterCache.monthFormatter.string(from: self)
        }
    }
    
    var dateString: String {
        DateFormatterCache.withLock {
            DateFormatterCache.dayFormatter.string(from: self)
        }
    }
}

extension Bundle {
    public var icon: UIImage? {
        if let icons = infoDictionary?["CFBundleIcons"] as? [String: Any],
           let primaryIcon = icons["CFBundlePrimaryIcon"] as? [String: Any],
           let iconFiles = primaryIcon["CFBundleIconFiles"] as? [String],
           let lastIcon = iconFiles.last {
            return UIImage(named: lastIcon)
        }
        return nil
    }
}

extension Double {
    /*
     10000.asString(style: .positional)  // 2:46:40
     10000.asString(style: .abbreviated) // 2h 46m 40s
     10000.asString(style: .short)       // 2 hr, 46 min, 40 sec
     10000.asString(style: .full)        // 2 hours, 46 minutes, 40 seconds
     10000.asString(style: .spellOut)    // two hours, forty-six minutes, forty seconds
     10000.asString(style: .brief)       // 2hr 46min 40sec
     */
    func asString(style: DateComponentsFormatter.UnitsStyle) -> String {
        DurationFormatterCache.string(from: self, style: style)
    }
}

extension View {
    func cornerRadius(_ radius: CGFloat, corners: UIRectCorner) -> some View {
        clipShape( RoundedCorner(radius: radius, corners: corners) )
    }
}

struct RoundedCorner: Shape {
    
    var radius: CGFloat = .infinity
    var corners: UIRectCorner = .allCorners
    
    func path(in rect: CGRect) -> Path {
        let path = UIBezierPath(roundedRect: rect, byRoundingCorners: corners, cornerRadii: CGSize(width: radius, height: radius))
        return Path(path.cgPath)
    }
}