import SwiftUI

struct IntegrationsView: View {

    @Environment(\.dismiss) private var dismiss

    @State private var selectedInstruction: ConfigurationFileInstructions?

    private let socketPath = (NSHomeDirectory().replacingOccurrences(of: Bundle.hostBundleID, with: Bundle.agentBundleID) as NSString).appendingPathComponent("socket.ssh") as String

    var body: some View {
        NavigationSplitView {
            List(selection: $selectedInstruction) {
                ForEach(instructions) { group in
                    Section(group.name) {
                        ForEach(group.instructions) { instruction in
                            Text(instruction.tool)
                                .padding(.vertical, 8)
                                .tag(instruction)
                        }
                    }
                }
            }
        } detail: {
            if let selectedInstruction {
                Form {
                    switch selectedInstruction.id {
                    case .gettingStarted:
                        Text("TBD")
                    case .tool:
                        ForEach(selectedInstruction.steps) { stepGroup in
                            Section {
                                ConfigurationItemView(title: "Configuration File", value: stepGroup.path, action: .revealInFinder(stepGroup.path))
                                ForEach(stepGroup.steps, id: \.self) { step in
                                    ConfigurationItemView(title: "Add This:", action: .copy(step)) {
                                        HStack {
                                            Text(step)
                                                .padding(8)
                                                .font(.system(.subheadline, design: .monospaced))
                                            Spacer()
                                        }
                                        .frame(maxWidth: .infinity)
                                        .background {
                                            RoundedRectangle(cornerRadius: 6)
                                                .fill(.black.opacity(0.05))
                                                .stroke(.separator, lineWidth: 1)
                                        }
                                    }
                                }
                            } footer: {
                                if let note = stepGroup.note {
                                    Text(note)
                                        .font(.caption)
                                }
                            }
                        }
                        if let url = selectedInstruction.website {
                            Section {
                                Link(destination: url) {
                                    VStack(alignment: .leading, spacing: 5) {
                                        Text("View Documentation on Web")
                                            .font(.headline)
                                        Text(url.absoluteString)
                                            .font(.caption2)
                                    }
                                }
                            }
                        }
                    case .otherShell:
                        Section {
                            Link("View on GitHub", destination: URL(string: "https://github.com/maxgoedjen/secretive-config-instructions/tree/main/shells")!)
                        } header: {
                            Text("There's a community-maintained list of shell instructions on GitHub. If the shell you're looking for isn't supported, create an issue and the community may be able to help.")
                                .font(.body)
                        }
                    case .otherApp:
                        Section {
                            Link("View on GitHub", destination: URL(string: "https://github.com/maxgoedjen/secretive-config-instructions/tree/main/apps")!)
                        } header: {
                            Text("There's a community-maintained list of instructions for apps on GitHub. If the app you're looking for isn't supported, create an issue and the community may be able to help.")
                                .font(.body)
                        }
                    }
                }
                .formStyle(.grouped)
            }
        }
        .onAppear {
            selectedInstruction = instructions.first?.instructions.first
        }
        .toolbar {
            ToolbarItem(placement: .primaryAction) {
                Button("Done") {
                    dismiss()
                }
                .styled
            }
        }
    }

}

extension IntegrationsView {

    fileprivate var instructions: [ConfigurationGroup] {
        [
            ConfigurationGroup(name:"Integrations", instructions: [
                ConfigurationFileInstructions("Getting Started", id: .gettingStarted),
            ]),
            ConfigurationGroup(
                name: "System",
                instructions: [
                    ConfigurationFileInstructions(
                        tool: "SSH",
                        configPath: "~/.ssh/config",
                        configText: "Host *\n\tIdentityAgent \(socketPath)",
                        website: URL(string: "https://man.openbsd.org/ssh_config.5")!,
                    ),
                    ConfigurationFileInstructions(
                        tool: "Git Signing",
                        steps: [
                            .init(path: "~/.gitconfig", steps: [
                                """
                                [user]
                                    signingkey = YOUR_PUBLIC_KEY_PATH
                                [commit]
                                    gpgsign = true
                                [gpg]
                                    format = ssh
                                [gpg "ssh"]
                                    allowedSignersFile = ~/.gitallowedsigners
                                """
                            ],
                                  note: "If any section (like [user]) already exists, just add the entries in the existing section."

                                 ),
                            .init(
                                path: "~/.gitallowedsigners",
                                steps: [
                                    "YOUR_PUBLIC_KEY"
                                ],
                                note: "~/.gitallowedsigners probably does not exist. You'll need to create it."
                            ),
                        ],
                        website:  URL(string: "https://git-scm.com/docs/git-config")!,
                    )
                ]
            ),
            ConfigurationGroup(name: "Shell", instructions: [
                ConfigurationFileInstructions(
                    tool: "zsh",
                    configPath: "~/.zshrc",
                    configText: "export SSH_AUTH_SOCK=\(socketPath)"
                ),
                ConfigurationFileInstructions(
                    tool: "bash",
                    configPath: "~/.bashrc",
                    configText: "export SSH_AUTH_SOCK=\(socketPath)"
                ),
                ConfigurationFileInstructions(
                    tool: "fish",
                    configPath: "~/.config/fish/config.fish",
                    configText: "set -x SSH_AUTH_SOCK \(socketPath)"
                ),
                ConfigurationFileInstructions("other", id: .otherShell),
            ]),
            ConfigurationGroup(name:"Apps", instructions: [
                ConfigurationFileInstructions("Other", id: .otherApp),
            ]),
        ]
    }

}

struct ConfigurationGroup: Identifiable {
    let id = UUID()
    var name: LocalizedStringResource
    var instructions: [ConfigurationFileInstructions] = []
}

struct ConfigurationFileInstructions: Hashable, Identifiable {

    struct StepGroup: Hashable, Identifiable {
        let path: String
        let steps: [String]
        let note: String?
        var id: String { path }

        init(path: String, steps: [String], note: String? = nil) {
            self.path = path
            self.steps = steps
            self.note = note
        }
    }

    var id: ID
    var tool: String
    var steps: [StepGroup]
    var website: URL?

    init(tool: String, configPath: String, configText: String, website: URL? = nil) {
        self.id = .tool(tool)
        self.tool = tool
        self.steps = [StepGroup(path: configPath, steps: [configText])]
        self.website = website
    }

    init(tool: String, steps: [StepGroup], website: URL? = nil) {
        self.id = .tool(tool)
        self.tool = tool
        self.steps = steps
        self.website = website
    }

    init(_ name: LocalizedStringResource, id: ID) {
        self.id = id
        tool = String(localized: name)
        self.steps = []
    }

    enum ID: Identifiable, Hashable {
        case gettingStarted
        case tool(String)
        case otherShell
        case otherApp

        var id: String {
            switch self {
            case .gettingStarted:
                "getting_started"
            case .tool(let name):
                name
            case .otherShell:
                "other_shell"
            case .otherApp:
                "other_app"
            }
        }
    }

}


#Preview {
    IntegrationsView()
        .frame(height: 500)
}