//
//  StringExtension.swift
//  PHP Monitor
//
//  Copyright © 2025 Nico Verbruggen. All rights reserved.
//
import Foundation
import SwiftUI

struct Localization {
    static var preferredLanguage: String? {
        if App.shared.preferences == nil {
            return nil
        }

        guard let language = Preferences.preferences[.languageOverride] as? String else {
            return nil
        }

        if language.isEmpty {
            return nil
        }

        return language
    }

    static var bundle: Bundle = {
        if !isRunningTests {
            return Bundle.main
        }

        let foundBundle = Bundle(identifier: "com.nicoverbruggen.phpmon")
            ?? Bundle(identifier: "com.nicoverbruggen.phpmon.ui-tests")

        if foundBundle == nil {
            let bundles = Bundle.allBundles
                .map { $0.bundleIdentifier }
                .filter { $0 != nil }
                .map { $0! }

            fatalError("The following bundles were found: \(bundles)")
        }

        return foundBundle!
    }()
}

extension String {
    var localized: String {
        var preferredBundle: Bundle = Localization.bundle

        if let preferred = Localization.preferredLanguage,
           let path = Localization.bundle.path(forResource: preferred, ofType: "lproj"),
           let bundle = Bundle(path: path) {
            preferredBundle = bundle
        }

        let string = NSLocalizedString(self, tableName: nil, bundle: preferredBundle, value: "", comment: "")

        // Fallback to English translation if the localized value is equal to the key (should not happen)
        if string == self {
            guard let path = Localization.bundle.path(forResource: "en", ofType: "lproj"),
                let bundle = Bundle(path: path)
            else { return self }
            return NSLocalizedString(self, bundle: bundle, comment: "")
        }

        return string.replacing("Preferences", with: "Settings")
    }

    var localizedForSwiftUI: LocalizedStringKey {
        return LocalizedStringKey(self.localized)
    }

    func localized(_ args: CVarArg...) -> String {
        String(format: self.localized, arguments: args)
    }

    func countInstances(of stringToFind: String) -> Int {
        if stringToFind.isEmpty {
            return 0
        }

        var count = 0
        var searchRange: Range<String.Index>?

        while let foundRange = range(of: stringToFind, options: [], range: searchRange) {
            count += 1
            searchRange = Range(uncheckedBounds: (lower: foundRange.upperBound, upper: endIndex))
        }

        return count
    }

    func matches(pattern: String) -> Bool {
        let pred = NSPredicate(format: "self LIKE %@", pattern)
        return !NSArray(object: self).filtered(using: pred).isEmpty
    }

    static func random(_ length: Int) -> String {
        let characters = "0123456789abcdefghijklmnopqrstuvwxyz"
        return String((0..<length).map { _ in characters.randomElement()! })
    }

    subscript(r: Range<String.Index>) -> String {
        let start = r.lowerBound
        let end = r.upperBound
        return String(self[start ..< end])
    }

    // Code taken from: https://sarunw.com/posts/how-to-compare-two-app-version-strings-in-swift/
    /*
     <1> We split the version by period (.).
     <2> Then, we find the difference of digit that we will zero pad.
     <3> If there are no differences, we don't need to do anything and use simple .compare.
     <4> We populate an array of missing zero.
     <5> We add zero pad array to a version with a fewer period and zero.
     <6> We user array components to build back our versions from components and compare them.
         This time it will have the same period and number of digit.
     */
    func versionCompare(_ otherVersion: String) -> ComparisonResult {
        let versionDelimiter = "."

        var versionComponents = self.components(separatedBy: versionDelimiter) // <1>
        var otherVersionComponents = otherVersion.components(separatedBy: versionDelimiter)

        let zeroDiff = versionComponents.count - otherVersionComponents.count // <2>

        if zeroDiff == 0 { // <3>
            // Same format, compare normally
            return self.compare(otherVersion, options: .numeric)
        } else {
            let zeros = Array(repeating: "0", count: abs(zeroDiff)) // <4>
            if zeroDiff > 0 {
                otherVersionComponents.append(contentsOf: zeros) // <5>
            } else {
                versionComponents.append(contentsOf: zeros)
            }
            return versionComponents.joined(separator: versionDelimiter)
                .compare(otherVersionComponents.joined(separator: versionDelimiter), options: .numeric) // <6>
        }
    }

    var stripped: String {
        do {
            guard let data = self.data(using: .unicode) else {
                return ""
            }
            let attributed = try NSAttributedString(
                data: data,
                options: [
                    .documentType: NSAttributedString.DocumentType.html,
                    .characterEncoding: String.Encoding.utf8.rawValue],
                documentAttributes: nil
            )
            return attributed.string
        } catch {
            return ""
        }
    }

    var isNumber: Bool {
        return self.range(
            of: "^[0-9]*$", // 1
            options: .regularExpression) != nil
    }

    // MARK: - Helpers

    var withDisplayName: String {
        return self.replacing("PHP Monitor", with: App.displayName)
    }
}
