//
//  ContentView.swift
//  meterios-watch
//
//  (c) 2025 Martin "maride" Dessauer
//

import SwiftUI

struct ContentView: View {
    private var wcMgr: WCManager
    
    @State private var favouriteDrinks: Array<Drink> = []
    @State private var availableDrinks: Array<Drink> = []
    
    @State private var showUpdateError: Bool = false
    @State private var updateError: String = ""
    @State private var updateErrorCount: Int = 0
    
    init(_ wcMgr: WCManager) {
        self.wcMgr = wcMgr
    }
    
    // update performs a full update from the paired device, covering connection info (user ID and backend address) and list of drinks
    func update() {
        if updateErrorCount >= 3 {
            showUpdateError = true
            updateErrorCount = 0
            return
        }
        
        // Update drinks list from paired device
        wcMgr.requestDrinksList(
            replyHandler: { favDrinks, availDrinks in
                // Drinks received from backend
                self.favouriteDrinks = favDrinks
                self.availableDrinks = availDrinks
                showUpdateError = false
            }, errorHandler: { error in
                // Error receiving drinks
                print("Error receiving drinks: \(error)")
                updateError = error?.localizedDescription ?? "Unknown error"
                updateErrorCount += 1
                update()
            }
        )
    }
    
    var body: some View {
        ZStack {
            if favouriteDrinks.count + availableDrinks.count > 0 {
                NavigationView {
                    List() {
                        // Drinks
                        Section(String(localized: "FAVOURITES")) {
                            ForEach(favouriteDrinks) { drink in
                                NavigationLink(drink.name) {
                                    DrinkDetailView(wcMgr: wcMgr, drink: drink)
                                }
                            }
                        }
                        Section(String(localized: "DRINKS")) {
                            ForEach(availableDrinks) { drink in
                                NavigationLink(drink.name) {
                                    DrinkDetailView(wcMgr: wcMgr, drink: drink)
                                }
                            }
                        }
                        
                        // Controls
                        Section {
                            Button(String(localized: "REFRESH")) {
                                favouriteDrinks = []
                                availableDrinks = []
                                update()
                            }
                        }
                    }
                }
            } else {
                ProgressView()
            }
        }
        .onAppear(perform: update)
        // Alert to communicate an error in communication with the paired device
        .alert(String(localized: "CONNECTION_ERROR"), isPresented: $showUpdateError) {
            Text(updateError).tint(.red).font(.footnote)
            Button(String(localized: "RETRY"), systemImage: "arrow.clockwise", action: update)
        }
    }
}