//
//  StockSettingsView.swift
//  iris
//

import SwiftUI

struct StockSettingsView: View {
    @ObservedObject var store: StockSettingsStore
    @State private var newSymbol: String = ""
    @State private var showError: Bool = false
    @State private var errorMessage: String = ""

    var body: some View {
        Form {
            Section {
                ForEach(store.symbols, id: \.self) { symbol in
                    HStack {
                        Text(symbol)
                            .font(.body.monospaced())
                        Spacer()
                        Button(role: .destructive) {
                            store.removeSymbol(symbol)
                        } label: {
                            Image(systemName: "trash")
                                .foregroundStyle(.red)
                        }
                        .buttonStyle(.plain)
                    }
                }
                .onDelete { indexSet in
                    for index in indexSet {
                        store.removeSymbol(store.symbols[index])
                    }
                }

                if store.symbols.count < 5 {
                    HStack {
                        TextField("Symbol (e.g. AAPL)", text: $newSymbol)
                            .textInputAutocapitalization(.characters)
                            .autocorrectionDisabled()
                            .font(.body.monospaced())
                        Button("Add") {
                            addSymbol()
                        }
                        .disabled(newSymbol.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty)
                    }
                }
            } header: {
                Text("Stock Symbols")
            } footer: {
                Text("Enter up to 5 stock symbols. Cards appear in the FYI section.")
            }

            Section {
                VStack(alignment: .leading, spacing: 8) {
                    Text("Examples:")
                        .font(.subheadline.bold())
                    Text("AAPL - Apple Inc.")
                    Text("GOOGL - Alphabet Inc.")
                    Text("^GSPC - S&P 500 Index")
                    Text("^DJI - Dow Jones")
                    Text("^IXIC - NASDAQ Composite")
                }
                .font(.caption)
                .foregroundStyle(.secondary)
            }
        }
        .navigationTitle("Stocks")
        .alert("Error", isPresented: $showError) {
            Button("OK") {}
        } message: {
            Text(errorMessage)
        }
    }

    private func addSymbol() {
        let cleaned = newSymbol.trimmingCharacters(in: .whitespacesAndNewlines).uppercased()
        guard !cleaned.isEmpty else { return }

        if store.symbols.contains(cleaned) {
            errorMessage = "Symbol '\(cleaned)' already exists."
            showError = true
            return
        }

        if store.symbols.count >= 5 {
            errorMessage = "Maximum of 5 symbols allowed."
            showError = true
            return
        }

        store.addSymbol(cleaned)
        newSymbol = ""
    }
}

struct StockSettingsView_Previews: PreviewProvider {
    static var previews: some View {
        NavigationStack {
            StockSettingsView(store: StockSettingsStore())
        }
    }
}