import Foundation
import SwiftUI

struct Help: View {
    static let wikiURL = URL(string: "https://github.com/yattee/yattee/wiki")!
    static let matrixURL = URL(string: "https://tinyurl.com/yattee-matrix")!
    static let issuesURL = URL(string: "https://github.com/yattee/yattee/issues")!
    static let milestonesURL = URL(string: "https://github.com/yattee/yattee/milestones")!
    static let donationsURL = URL(string: "https://github.com/yattee/yattee/wiki/Donations")!
    static let contributingURL = URL(string: "https://github.com/yattee/yattee/wiki/Contributing")!

    @Environment(\.openURL) private var openURL

    var body: some View {
        Group {
            ScrollView(.vertical, showsIndicators: false) {
                VStack(alignment: .leading, spacing: 0) {
                    Section {
                        header("I am lost")

                        Text("You can find information about using Yattee in the Wiki pages.")
                            .padding(.bottom, 8)

                        helpItemLink("Wiki", url: Self.wikiURL, systemImage: "questionmark.circle")
                            .padding(.bottom, 8)
                    }

                    Spacer()

                    Section {
                        header("I want to ask a question")

                        Text("Discussions take place in Matrix chat channel. It's a good spot for general questions.")
                            .padding(.bottom, 8)

                        helpItemLink("Matrix Channel", url: Self.matrixURL, systemImage: "message")
                            .padding(.bottom, 8)
                    }

                    Spacer()

                    Section {
                        header("I found a bug /")
                        header("I have a feature request")

                        Text("Bugs and great feature ideas can be sent to the GitHub issues tracker. ")
                        Text("If you are reporting a bug, include all relevant details (especially: app\u{00a0}version, used device and system version, steps to reproduce).")
                        Text("If you are interested what's coming in future updates, you can track project Milestones.")
                            .padding(.bottom, 8)

                        VStack(alignment: .leading, spacing: 8) {
                            helpItemLink("Issues Tracker", url: Self.issuesURL, systemImage: "ladybug")
                            helpItemLink("Milestones", url: Self.milestonesURL, systemImage: "list.star")
                        }
                        .padding(.bottom, 8)
                    }

                    Spacer()

                    Section {
                        header("I like this app!")

                        Text("That's nice to hear. It is fun to deliver apps other people want to use. " +
                            "You can consider donating to the project or help by contributing to new features development.")
                            .padding(.bottom, 8)

                        VStack(alignment: .leading, spacing: 8) {
                            helpItemLink("Donations", url: Self.donationsURL, systemImage: "dollarsign.circle")
                            helpItemLink("Contributing", url: Self.contributingURL, systemImage: "hammer")
                        }
                        .padding(.bottom, 8)
                    }
                }
                #if os(iOS)
                .padding(.horizontal)
                #endif
            }
        }
        #if os(tvOS)
        .frame(maxWidth: 1000)
        #else
        .frame(maxWidth: .infinity, alignment: .leading)
        #endif
        .navigationTitle("Help")
    }

    func header(_ text: String) -> some View {
        Text(text)
            .fontWeight(.bold)
            .font(.title3)
            .padding(.bottom, 6)
    }

    func helpItemLink(_ label: String, url: URL, systemImage: String) -> some View {
        Group {
            #if os(tvOS)
                VStack {
                    Button {} label: {
                        HStack(spacing: 8) {
                            Image(systemName: systemImage)
                            Text(label)
                        }
                        .font(.system(size: 25).bold())
                    }

                    Text(url.absoluteString)
                }
                .frame(maxWidth: .infinity)
            #else
                Button {
                    openURL(url)
                } label: {
                    Label(label, systemImage: systemImage)
                }
            #endif
        }
    }
}

struct Help_Previews: PreviewProvider {
    static var previews: some View {
        Help()
    }
}