import Combine
import Foundation
import Martin
import SwiftUI

struct ConversationScreen: View {
    @EnvironmentObject var store: AppStore

    var body: some View {
        ZStack {
            // Background color
            Color.Main.backgroundLight
                .ignoresSafeArea()

            // Content
            VStack(spacing: 0) {
                // Header
                ConversationScreenHeader()

                // Msg list
                let messages = store.state.conversationsState.currentMessages
                if !messages.isEmpty {
                    List {
                        ForEach(messages) { message in
                            ConversationMessageRow(message: message)
                        }
                    }
                    .listStyle(.plain)
                    .background(Color.Main.backgroundLight)
                    .scrollDismissesKeyboard(.immediately)
                } else {
                    Spacer()
                }
            }
            .onTapGesture {
                UIApplication.shared.sendAction(#selector(UIResponder.resignFirstResponder), to: nil, from: nil, for: nil)
            }
        }
        .safeAreaInset(edge: .bottom, spacing: 0) {
            ConversationScreenTextInput()
        }
    }
}

struct ConversationScreenTextInput: View {
    @EnvironmentObject var store: AppStore

    @State private var messageStr = ""

    var body: some View {
        HStack {
            Image(systemName: "paperclip")
                .font(.title2)
                .foregroundColor(.Tango.blueLight)
                .padding(.leading, 8)
                .tappablePadding(.symmetric(8)) {
                    print("Attach file")
                }
            TextField(L10n.Chat.textfieldPrompt, text: $messageStr)
                .font(.body1)
                .padding(.horizontal, 8)
                .padding(.vertical, 4)
                .background(Color.Main.white)
                .clipShape(RoundedRectangle(cornerRadius: 8))
                .padding(.vertical, 4)
            let img = messageStr.isEmpty ? "paperplane" : "paperplane.fill"
            Image(systemName: img)
                .font(.title2)
                .foregroundColor(messageStr.isEmpty ? .Main.separator : .Tango.blueLight)
                .padding(.trailing, 8)
                .tappablePadding(.symmetric(8)) {
                    if !messageStr.isEmpty {
                        guard let acc = store.state.conversationsState.currentChat?.account else { return }
                        guard let contact = store.state.conversationsState.currentChat?.participant else { return }
                        store.dispatch(.conversationAction(.sendMessage(
                            from: acc,
                            to: contact,
                            body: messageStr
                        )))
                        messageStr = ""
                        UIApplication.shared.sendAction(#selector(UIResponder.resignFirstResponder), to: nil, from: nil, for: nil)
                    }
                }
        }
        .padding(.vertical, 8)
        .background(Color.Main.backgroundDark)
    }
}

private struct ConversationScreenHeader: View {
    @EnvironmentObject var store: AppStore

    var body: some View {
        ZStack {
            // bg
            Color.Main.backgroundDark
                .ignoresSafeArea()

            // title
            let name = (
                store.state.conversationsState.currentRoster?.name ??
                    store.state.conversationsState.currentRoster?.contactBareJid
            ) ?? L10n.Chat.title
            Text(name)
                .font(.head2)
                .foregroundColor(Color.Main.black)

            HStack {
                Image(systemName: "chevron.left")
                    .foregroundColor(Color.Tango.orangeMedium)
                    .tappablePadding(.symmetric(12)) {
                        store.dispatch(.changeFlow(store.state.previousFlow))
                    }
                Spacer()
            }
            .padding(.horizontal, 16)
        }
        .frame(height: 44)
    }
}

private struct ConversationMessageRow: View {
    @EnvironmentObject var store: AppStore

    let message: Message

    var body: some View {
        VStack(spacing: 0) {
            HStack(spacing: 0) {
                if isOutgoing() {
                    Spacer()
                    VStack(spacing: 0) {
                        MessageTime(message: message)
                        Spacer()
                    }
                    .padding(.trailing, 4)
                }
                MessageContainer(message: message, isOutgoing: isOutgoing())
                    .background(isOutgoing() ? Color.Material.greenDark100 : Color.Main.white)
                    .clipShape(MessageBubble(isOutgoing: isOutgoing()))
                if !isOutgoing() {
                    VStack(spacing: 0) {
                        MessageTime(message: message)
                        Spacer()
                    }
                    .padding(.leading, 4)
                    Spacer()
                }
            }
            .padding(.vertical, 10)
            .padding(.horizontal, 16)
        }
        .sharedListRow()
    }

    private func isOutgoing() -> Bool {
        message.from == store.state.conversationsState.currentChat?.account
    }
}

struct MessageContainer: View {
    let message: Message
    let isOutgoing: Bool

    var body: some View {
        Text(message.body ?? "...")
            .font(.body2)
            .foregroundColor(Color.Main.black)
            .multilineTextAlignment(.leading)
            .padding(10)
    }
}

struct MessageBubble: Shape {
    let isOutgoing: Bool

    func path(in rect: CGRect) -> Path {
        let path = UIBezierPath(
            roundedRect: rect,
            byRoundingCorners: isOutgoing ? [.topLeft, .bottomLeft, .bottomRight] : [.topRight, .bottomLeft, .bottomRight],
            cornerRadii: CGSize(width: 8, height: 10)
        )
        return Path(path.cgPath)
    }
}

struct MessageTime: View {
    let message: Message

    var body: some View {
        Text(message.date, style: .time)
            .font(.sub2)
            .foregroundColor(Color.Main.gray)
    }
}

// Preview
#if DEBUG
    struct ConversationScreen_Previews: PreviewProvider {
        static var previews: some View {
            ConversationScreen()
                .environmentObject(pStore)
        }

        static var pStore: AppStore {
            let state = pState
            return AppStore(initialState: state, reducer: AppState.reducer, middlewares: [])
        }

        static var pState: AppState {
            var state = AppState()

            let acc = "user@test.com"
            let contact = "some@test.com"

            state.conversationsState.currentChat = Chat(id: "1", account: acc, participant: contact, type: .chat)
            state.conversationsState.currentMessages = [
                Message(
                    id: "1",
                    type: .chat,
                    contentType: .text,
                    from: contact,
                    to: acc,
                    body: "this is for test sdgdsfg dsfg dsfgdg dsfgdfgsdgsdfgdfg sdfgdsfgdfsg dsfgdsfgsdfg dsfgdfgsdg fgf fgfg sdfsdf sdfsdf sdf  sdfsdf sdf sdfsdf sdfsdfsdf sdfsdf ",
                    subject: nil,
                    thread: nil,
                    oobUrl: nil,
                    date: Date(),
                    pending: false
                ),
                Message(id: "2", type: .chat, contentType: .text, from: contact, to: acc, body: "this is for testsdfsdf sdfsdf sdfs sdf sdffsdf  sdf sdf  sdf sdf sdf sdff sdfffwwe ", subject: nil, thread: nil, oobUrl: nil, date: Date(), pending: false),
                Message(id: "3", type: .chat, contentType: .text, from: contact, to: acc, body: "this is for test", subject: nil, thread: nil, oobUrl: nil, date: Date(), pending: false),
                Message(id: "4", type: .chat, contentType: .text, from: acc, to: contact, body: "this is for test  sdfkjwek jwkjfh jwerf   jdfhskjdhf  jsdhfjhwefh sjdhfh  fsdjhfh sd ", subject: nil, thread: nil, oobUrl: nil, date: Date(), pending: false),
                Message(id: "5", type: .chat, contentType: .text, from: contact, to: acc, body: "this is for test sdfjkkeke kekkddjw;;  w;edkdjfj l kjwekrjfk wef", subject: nil, thread: nil, oobUrl: nil, date: Date(), pending: false),
                Message(id: "6", type: .chat, contentType: .text, from: acc, to: contact, body: "this is for testsdf dsdkkekkddn  wejkjfj  ", subject: nil, thread: nil, oobUrl: nil, date: Date(), pending: false),
                Message(
                    id: "7",
                    type: .chat,
                    contentType: .text,
                    from: acc,
                    to: contact,

                    body: "this is for test sdgdsfg dsfg dsfgdg dsfgdfgsdgsdfgdfg sdfgdsfgdfsg dsfgdsfgsdfg dsfgdfgsdg fgf fgfg sdfsdf sdfsdf sdf  sdfsdf sdf sdfsdf sdfsdfsdf sdfsdf ",
                    subject: nil,
                    thread: nil,
                    oobUrl: nil,
                    date: Date(), pending: false
                ),
                Message(id: "8", type: .chat, contentType: .text, from: acc, to: contact, body: "so test", subject: nil, thread: nil, oobUrl: nil, date: Date(), pending: false),
                Message(id: "9", type: .chat, contentType: .text, from: contact, to: acc, body: "so test", subject: nil, thread: nil, oobUrl: nil, date: Date(), pending: false),
                Message(id: "10", type: .chat, contentType: .text, from: acc, to: contact, body: "so test so test so test", subject: nil, thread: nil, oobUrl: nil, date: Date(), pending: false),
                Message(id: "11", type: .chat, contentType: .text, from: contact, to: acc, body: "xD", subject: nil, thread: nil, oobUrl: nil, date: Date(), pending: false)
            ]
            return state
        }
    }
#endif