import SwiftUI

struct LoginView: View {
    @EnvironmentObject var viewModel: PDSViewModel
    
    @State private var serverURL = ""
    @State private var password = ""
    @State private var isLoggingIn = false
    @State private var showingDebugInfo = false
    @State private var debugLogs: [String] = []
    
    var body: some View {
        VStack(spacing: 20) {
            Image(systemName: "server.rack")
                .resizable()
                .aspectRatio(contentMode: .fit)
                .frame(width: 100, height: 100)
                .foregroundColor(.blue)
            
            Text("PDS Manager")
                .font(.largeTitle)
                .fontWeight(.bold)
            
            VStack(alignment: .leading, spacing: 20) {
                TextField("Server URL", text: $serverURL)
                    .textFieldStyle(RoundedBorderTextFieldStyle())
                    .autocapitalization(.none)
                    .disableAutocorrection(true)
                    .keyboardType(.URL)
                    .placeholder(when: serverURL.isEmpty) {
                        Text("example.com").foregroundColor(.gray.opacity(0.5))
                    }
                
                SecureField("Admin Password", text: $password)
                    .textFieldStyle(RoundedBorderTextFieldStyle())
            }
            .padding(.horizontal, 40)
            
            Button {
                login()
            } label: {
                if isLoggingIn {
                    ProgressView()
                        .progressViewStyle(CircularProgressViewStyle(tint: .white))
                        .frame(maxWidth: .infinity)
                        .padding()
                } else {
                    Text("Login")
                        .frame(maxWidth: .infinity)
                        .padding()
                }
            }
            .background(Color.blue)
            .foregroundColor(.white)
            .cornerRadius(10)
            .padding(.horizontal, 40)
            .disabled(serverURL.isEmpty || password.isEmpty || isLoggingIn)
            
            if let errorMessage = viewModel.errorMessage {
                Text(errorMessage)
                    .foregroundColor(.red)
                    .font(.callout)
                    .multilineTextAlignment(.center)
                    .padding(.horizontal, 40)
                    .padding(.vertical, 10)
                    .background(Color.red.opacity(0.1))
                    .cornerRadius(8)
            }
            
            Divider()
                .padding(.vertical, 10)
                .padding(.horizontal, 40)
            
            Button {
                enterDemoMode()
            } label: {
                HStack {
                    Image(systemName: "rectangle.fill.on.rectangle.fill.circle")
                        .imageScale(.medium)
                    Text("Enter Demo Mode")
                }
                .frame(maxWidth: .infinity)
                .padding()
            }
            .background(Color.green)
            .foregroundColor(.white)
            .cornerRadius(10)
            .padding(.horizontal, 40)
            
            Button("Show Debug Info") {
                showingDebugInfo.toggle()
            }
            .font(.caption)
            .foregroundColor(.secondary)
            .padding(.top, 10)
            
            if showingDebugInfo {
                ScrollView {
                    VStack(alignment: .leading, spacing: 8) {
                        ForEach(debugLogs, id: \.self) { log in
                            Text(log)
                                .font(.system(.caption, design: .monospaced))
                        }
                    }
                    .frame(maxWidth: .infinity, alignment: .leading)
                    .padding()
                }
                .frame(height: 200)
                .background(Color.black.opacity(0.05))
                .cornerRadius(8)
                .padding(.horizontal, 40)
            }
            
            Spacer()
        }
        .padding(.top, 50)
        .onAppear {
            // Add some example connection info
            debugLogs.append("Example URLs:")
            debugLogs.append("bsky.social - Main Bluesky server")
            debugLogs.append("bsky.atri.dad - Your local server")
            debugLogs.append("localhost:3000 - Local development PDS")
        }
    }
    
    private func enterDemoMode() {
        debugLogs.append("Entering demo mode...")
        viewModel.enableDemoMode()
    }
    
    private func login() {
        isLoggingIn = true
        
        // Add debug info
        debugLogs.append("Attempting login to: \(serverURL)")
        
        // Normalize the URL to ensure it has the correct format
        var cleanURL = normalizeServerURL(serverURL)
        debugLogs.append("Using final URL: \(cleanURL)")
        
        Task {
            await viewModel.login(serverURL: cleanURL, username: "admin", password: password)
            isLoggingIn = false
            
            if let error = viewModel.errorMessage {
                debugLogs.append("Login failed: \(error)")
            } else {
                debugLogs.append("Login successful!")
            }
        }
    }
    
    private func normalizeServerURL(_ url: String) -> String {
        // Remove any leading/trailing whitespace
        var cleanURL = url.trimmingCharacters(in: .whitespacesAndNewlines)
        
        // Strip any existing protocol prefix
        if cleanURL.hasPrefix("http://") {
            cleanURL = String(cleanURL.dropFirst(7))
            debugLogs.append("Removed http:// prefix")
        } else if cleanURL.hasPrefix("https://") {
            cleanURL = String(cleanURL.dropFirst(8))
            debugLogs.append("Removed https:// prefix")
        }
        
        // Remove trailing slash if present
        if cleanURL.hasSuffix("/") {
            cleanURL.removeLast()
            debugLogs.append("Removed trailing slash")
        }
        
        // Add https:// prefix (always use HTTPS by default)
        cleanURL = "https://\(cleanURL)"
        debugLogs.append("Added https:// prefix")
        
        return cleanURL
    }
}

// Placeholder extension for TextField
extension View {
    func placeholder<Content: View>(
        when shouldShow: Bool,
        alignment: Alignment = .leading,
        @ViewBuilder placeholder: () -> Content
    ) -> some View {
        ZStack(alignment: alignment) {
            placeholder().opacity(shouldShow ? 1 : 0)
            self
        }
    }
}