import SwiftUI

struct HostEditor: View {
    let store: ProxyStore
    let isNew: Bool
    @State private var host: ProxyHost
    @Environment(\.dismiss) private var dismiss
    @State private var domains: String
    @State private var port: String
    @State private var saving = false
    @State private var error: String?

    init(store: ProxyStore, host: ProxyHost, isNew: Bool) {
        self.store = store
        self.isNew = isNew
        _host = State(initialValue: host)
        _domains = State(initialValue: host.domainNames.joined(separator: ", "))
        _port = State(initialValue: String(host.forwardPort))
    }

    private var valid: Bool {
        let names = domains.split(separator: ",").map { $0.trimmingCharacters(in: .whitespacesAndNewlines) }
        return !names.isEmpty && names.allSatisfy { !$0.isEmpty && !$0.contains(" ") && !$0.contains("/") }
            && !host.forwardHost.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty
            && (1...65535).contains(Int(port) ?? 0)
    }

    var body: some View {
        VStack(spacing: 0) {
            HStack {
                Text(isNew ? "New Proxy Host" : "Edit Proxy Host").font(.headline)
                Spacer()
            }
            .padding(20)
            Form {
                Section {
                    TextField("Domain Names", text: $domains, prompt: Text("app.example.com"))
                    Picker("Forward Scheme", selection: $host.forwardScheme) {
                        Text("HTTP").tag("http")
                        Text("HTTPS").tag("https")
                    }
                    TextField("Forward Host", text: $host.forwardHost, prompt: Text("192.168.1.20"))
                    TextField("Forward Port", text: $port, prompt: Text("8080"))
                } header: {
                    Text("Forwarding")
                } footer: {
                    Text("Separate multiple domain names with commas.")
                }
                Section("Security") {
                    Picker("SSL Certificate", selection: $host.certificateId) {
                        Text("None").tag(0)
                        ForEach(store.certificates) { certificate in
                            Text(certificate.niceName).tag(certificate.id)
                        }
                    }
                    Toggle("Force HTTPS", isOn: $host.sslForced).disabled(host.certificateId == 0)
                    Toggle("Block Common Exploits", isOn: $host.blockExploits)
                }
                Section("Options") {
                    Toggle("HTTP/2 Support", isOn: $host.http2Support)
                    Toggle("WebSocket Support", isOn: $host.allowWebsocketUpgrade)
                }
            }
            .formStyle(.grouped)
            .disabled(saving)
            if let error {
                Label(error, systemImage: "exclamationmark.triangle")
                    .foregroundStyle(.red).padding(.horizontal, 20).padding(.bottom, 12)
            }
            Divider()
            HStack {
                if saving { ProgressView().controlSize(.small) }
                if store.isDemo { Text("Demo workspace").font(.callout).foregroundStyle(.secondary) }
                Spacer()
                Button("Cancel") { dismiss() }.keyboardShortcut(.cancelAction).disabled(saving)
                Button(isNew ? "Add" : "Save") { Task { await save() } }
                    .keyboardShortcut(.defaultAction)
                    .disabled(!valid || saving)
            }
            .padding(20)
        }
        .frame(width: 510, height: 610)
        .interactiveDismissDisabled(saving)
    }

    private func save() async {
        saving = true
        error = nil
        host.domainNames = domains.split(separator: ",").map { $0.trimmingCharacters(in: .whitespacesAndNewlines) }
        host.forwardHost = host.forwardHost.trimmingCharacters(in: .whitespacesAndNewlines)
        host.forwardPort = Int(port) ?? 80
        if host.certificateId == 0 { host.sslForced = false }
        do {
            try await store.save(host, isNew: isNew)
            dismiss()
        } catch { self.error = error.localizedDescription }
        saving = false
    }
}

struct ConnectionSheet: View {
    let store: ProxyStore
    @Environment(\.dismiss) private var dismiss
    @State private var url = ""
    @State private var email = ""
    @State private var password = ""
    @State private var connecting = false
    @State private var error: String?

    var body: some View {
        VStack(alignment: .leading, spacing: 20) {
            Text("Connect to Server").font(.headline)
            Text("Enter the address and credentials for your Nginx Proxy Manager server.")
                .foregroundStyle(.secondary)
            Form {
                TextField("Server URL:", text: $url, prompt: Text("https://proxy.example.com"))
                TextField("Email:", text: $email, prompt: Text("admin@example.com"))
                SecureField("Password:", text: $password)
            }
            .textFieldStyle(.roundedBorder)
            .disabled(connecting || store.isBusy)
            Text("Your login is saved in Keychain after connecting and used to reconnect when you open the app.")
                .font(.callout).foregroundStyle(.secondary)
            Button("Forget Saved Login") {
                do {
                    try store.forgetCredentials()
                    password = ""
                    error = nil
                } catch { self.error = error.localizedDescription }
            }
            .disabled(connecting || store.isBusy)
            Text("Forgetting the saved login leaves the current session connected.")
                .font(.caption).foregroundStyle(.secondary)
            if let error {
                Label(error, systemImage: "exclamationmark.triangle").foregroundStyle(.red)
            }
            HStack {
                if connecting { ProgressView().controlSize(.small) }
                Spacer()
                Button("Cancel") { dismiss() }.keyboardShortcut(.cancelAction).disabled(connecting)
                Button("Connect") { Task { await connect() } }
                    .keyboardShortcut(.defaultAction)
                    .disabled(connecting || store.isBusy || url.isEmpty || email.isEmpty || password.isEmpty)
            }
        }
        .padding(24)
        .frame(width: 460)
        .onAppear { url = store.baseURL }
        .interactiveDismissDisabled(connecting)
    }

    private func connect() async {
        connecting = true
        error = nil
        do {
            try await store.connect(url: url, email: email, password: password)
            password = ""
            dismiss()
        } catch { self.error = error.localizedDescription }
        connecting = false
    }
}