import SwiftUI
import VoiceCatCore

struct AccountsView: View {
    @Bindable var session: SessionState
    @State private var showCreateAccount = false
    @State private var newUsername = ""
    @State private var newPassword = ""
    @State private var accountToDelete: Account?
    @State private var showResetPassword = false
    @State private var resetForAccount: Account?
    @State private var resetPassword = ""

    var body: some View {
        List {
            ForEach(session.accounts, id: \.username) { account in
                AccountRowView(account: account)
                    .swipeActions(edge: .trailing) {
                        Button(role: .destructive) {
                            accountToDelete = account
                        } label: {
                            Label("Delete", systemImage: "trash")
                        }
                        Button {
                            resetForAccount = account
                            showResetPassword = true
                        } label: {
                            Label("Reset PW", systemImage: "key")
                        }
                        .tint(.orange)
                    }
            }
        }
        .navigationTitle("Accounts")
        .navigationBarTitleDisplayMode(.inline)
        .toolbar {
            ToolbarItem(placement: .primaryAction) {
                Button {
                    showCreateAccount = true
                } label: {
                    Image(systemName: "plus")
                }
                .accessibilityLabel("Create account")
            }
        }
        .refreshable {
            session.fetchAccountList()
        }
        .onAppear {
            session.fetchAccountList()
        }
        .confirmationDialog("Delete account?", isPresented: Binding(
            get: { accountToDelete != nil },
            set: { if !$0 { accountToDelete = nil } }
        )) {
            if let a = accountToDelete {
                Button("Delete \(a.username)", role: .destructive) {
                    session.deleteAccount(username: a.username)
                    accountToDelete = nil
                }
            }
            Button("Cancel", role: .cancel) { accountToDelete = nil }
        }
        .sheet(isPresented: $showCreateAccount) {
            CreateAccountSheet(session: session)
        }
        .alert("Reset Password", isPresented: $showResetPassword) {
            SecureField("New password", text: $resetPassword)
                .accessibilityLabel("New password for account")
            Button("Reset") {
                if let a = resetForAccount, !resetPassword.isEmpty {
                    session.resetPassword(username: a.username, newPassword: resetPassword)
                }
                resetPassword = ""
                resetForAccount = nil
            }
            Button("Cancel", role: .cancel) {
                resetPassword = ""
                resetForAccount = nil
            }
        } message: {
            Text("Enter a new password for \(resetForAccount?.username ?? "").")
        }
    }
}

private struct AccountRowView: View {
    let account: Account

    private var joinedDate: String {
        let date = Date(timeIntervalSince1970: Double(account.createdAtUnixMs) / 1000)
        return date.formatted(.dateTime.year().month().day())
    }

    var body: some View {
        VStack(alignment: .leading, spacing: 2) {
            HStack {
                Text(account.username)
                    .fontWeight(.medium)
                if account.isAdmin {
                    Text("admin")
                        .font(.caption2)
                        .padding(.horizontal, 6).padding(.vertical, 2)
                        .background(.orange.opacity(0.2), in: Capsule())
                        .foregroundStyle(.orange)
                }
            }
            Text("Created \(joinedDate)")
                .font(.caption)
                .foregroundStyle(.secondary)
        }
        .accessibilityElement(children: .combine)
        .accessibilityLabel("\(account.username)\(account.isAdmin ? ", administrator" : ""), created \(joinedDate)")
    }
}

private struct CreateAccountSheet: View {
    @Bindable var session: SessionState
    @Environment(\.dismiss) private var dismiss
    @State private var username = ""
    @State private var password = ""

    var body: some View {
        NavigationStack {
            Form {
                Section {
                    TextField("Username", text: $username)
                        .textContentType(.username)
                        .autocorrectionDisabled()
                        .textInputAutocapitalization(.never)
                        .accessibilityLabel("Username")
                    SecureField("Password", text: $password)
                        .textContentType(.newPassword)
                        .accessibilityLabel("Password")
                }
            }
            .navigationTitle("Create Account")
            .navigationBarTitleDisplayMode(.inline)
            .toolbar {
                ToolbarItem(placement: .cancellationAction) {
                    Button("Cancel") { dismiss() }
                }
                ToolbarItem(placement: .confirmationAction) {
                    Button("Create") {
                        session.createAccount(username: username, password: password)
                        dismiss()
                    }
                    .disabled(username.isEmpty || password.isEmpty)
                }
            }
        }
    }
}