PackageDependency.swift

//
// PackageDependency.swift
// Copyright (c) 2024 BrightDigit.
// Licensed under MIT License
//

import Foundation
import PackageDescription

/// A protocol that represents a package dependency.
public protocol PackageDependency: _Named {
    /// The name of the package.
    var packageName: String { get }
    /// The package dependency description.
    var dependency: _PackageDescription_PackageDependency { get }
}

extension PackageDependency where Self: TargetDependency {
    /// The package dependency.
    var package: any PackageDependency {
        self
    }
    
    /// The target dependency.
    var targetDependency: _PackageDescription_TargetDependency {
        switch dependency.kind {
        case .sourceControl(let name, let location, requirement: _):
            let packageName = name ?? location.packageName ?? self.packageName
            return .product(name: productName, package: packageName, condition: self.condition)
        case .fileSystem(let name, let path):
            if let packageName = name ?? path.components(separatedBy: "/").last {
                return .product(name: productName, package: packageName, condition: self.condition)
            } else {
                return .byName(name: productName)
            }
        case .registry:
            return .byName(name: productName)
        @unknown default:
            return .byName(name: productName)
        }
    }
}

extension PackageDependency {
    /// The name of the package.
    var packageName: String {
        switch dependency.kind {
        case .sourceControl(let name, let location, requirement: _):
            return name ?? location.packageName ?? self.name
        case .fileSystem(let name, let path):
            return name ?? path.packageName ?? self.name
        case .registry(let id, requirement: _):
            return id
        @unknown default:
            return name
        }
    }
}