//
//  CourseCatalogView.swift
//  CourseCatalogView
//
//  Created by Felix Förtsch on 01.08.21.
//

import SwiftUI

struct CourseCatalogView: View {
    
    var courses: [Course] {
        let url = Bundle.main.url(forResource: "courses", withExtension: "json")!
        let data = try! Data(contentsOf: url)
        let decoder = JSONDecoder()
        var courses = try? decoder.decode([Course].self, from: data)
        
        courses?.sort(by: { $0.name < $1.name })
        return courses!
    }
    
    @State var searchText = ""
    
    var searchResults: [Course] {
        if searchText.isEmpty {
            return courses
        } else {
            return courses.filter { $0.name.contains(searchText) }
        }
    }
    
    var body: some View {
        NavigationView {
            List {
                ForEach(searchResults, id: \.self) { item in
                    
                    NavigationLink(destination: CourseDetailsView(item)) {
                        VStack(alignment: .leading) {
                            Text(item.name)
                            Text(item.type)
                                .font(.subheadline)
                                .foregroundColor(Color.gray)
                        }
                    }
                }
            }
            .searchable(text: $searchText)
            .navigationBarTitle("Courses")
        }
    }
}

struct CourseCatalogView_Previews: PreviewProvider {
    static var previews: some View {
        Group {
            CourseCatalogView().preferredColorScheme(.dark)
        }
    }
}