use std::{rc::Rc, time::Duration};

use base64::{engine::general_purpose, Engine as _};
use dioxus::prelude::*;
use tracing::{debug, warn};

use super::{button::Button, icons::SearchIcon, text_input::TextInput};
use crate::{
    domain::model::{common::PresenceState as DomainPresenceState, room::RoomId, space::SpaceId},
    ui::{
        components::{
            button::{JoinButton, RejectButton},
            icons::{ChatsIcon, LogoIcon, RoomsIcon, SpacesIcon},
        },
        hooks::use_long_press,
        ACCOUNT, STORE,
    },
};

turf::style_sheet!("src/ui/components/conversations.scss");

#[component]
fn AccountAvatar(content: Option<Vec<u8>>, class_name: Option<String>) -> Element {
    rsx! {
        if let Some(content) = content {
            div {
                class: class_name,
                background_image: format!("url(data:image/jpeg;base64,{})", general_purpose::STANDARD.encode(content))
            }
        }
    }
}

#[component]
fn PresenceState(state: Option<DomainPresenceState>, class_name: Option<String>) -> Element {
    let class_name = class_name.unwrap_or("".to_string());

    match state {
        Some(state) => {
            let state_class = match state {
                DomainPresenceState::Online => ClassName::ONLINE,
                DomainPresenceState::Offline => ClassName::OFFLINE,
                DomainPresenceState::Unavailable => ClassName::UNAVAILABLE,
                _ => ClassName::UNAVAILABLE,
            };

            let classes = [class_name.as_str(), state_class].join(" ");

            rsx! {
                div {
                    class: classes,
                    LogoIcon {}
                }
            }
        }
        None => VNode::empty(),
    }
}

#[component]
fn DisplayName(display_name: Option<String>, class_name: Option<String>) -> Element {
    match display_name {
        Some(display_name) => {
            rsx! {
                div {
                    class: class_name,
                    p {
                        {display_name}
                    }
                }
            }
        }
        None => VNode::empty(),
    }
}

#[component]
fn Status(status: Option<String>, class_name: Option<String>) -> Element {
    let status = status.unwrap_or("Type your status".to_string());

    rsx! {
        div {
            class: class_name,
            TextInput {
                placeholder: status,
            }
        }
    }
}

pub fn Account() -> Element {
    let avatar = use_resource(move || async move {
        let account = ACCOUNT.read();
        let avatar = account.get_avatar().await;
        rsx! {
            AccountAvatar {
                class_name: ClassName::ACCOUNT_AVATAR,
                content: avatar.borrow().clone(),
            }
        }
    });

    let presence_state = use_resource(move || async move {
        // TODO: Fetch the state from the domain
        rsx! {
            PresenceState {
                state: DomainPresenceState::Online,
                class_name: ClassName::ACCOUNT_PRESENCE_STATE,
            }
        }
    });

    let display_name = use_resource(move || async move {
        let account = ACCOUNT.read();
        let display_name = account.get_display_name().await;
        rsx! {
            DisplayName {
                class_name: ClassName::ACCOUNT_DISPLAY_NAME,
                display_name: display_name.borrow().clone(),
            }
        }
    });

    let status = use_resource(move || async move {
        // TODO: Fetch the status from the domain
        rsx! {
            Status {
                class_name: ClassName::ACCOUNT_STATUS,
                status: "Coucou, Je suis BG92".to_string(),
            }
        }
    });

    rsx! {
        div {
            class: ClassName::ACCOUNT,

            {avatar}
            {presence_state}
            {display_name}

            {status}

            div {
                class: ClassName::ACCOUNT_SPACES,
                Button {
                    SpacesIcon {}
                }
            }

            div {
                class: ClassName::ACCOUNT_CHAT,
                Button {
                    ChatsIcon {}
                }
            }

            div {
                class: ClassName::ACCOUNT_ROOM,
                Button {
                    RoomsIcon {}
                }
            }
        }
    }
}

#[component]
pub fn ConversationAvatar(
    room_id: RoomId,
    on_selected: Option<EventHandler<RoomId>>,
    on_pressed: Option<EventHandler<RoomId>>,
) -> Element {
    let long_press_duration = Duration::from_millis(500);

    let rooms = STORE.read().rooms();
    let room = rooms.get(&room_id).unwrap().signal();
    let room_id = Rc::new(room_id);
    let room_name = room.name();

    let selected_room_id = use_signal(|| None::<RoomId>);

    let invited_badge = if room.is_invited() {
        rsx! {
            div {
                class: ClassName::CONVERSATION_AVATAR_INVITED_BADGE,

                p {
                    "Invited"
                }
            }
        }
    } else {
        VNode::empty()
    };

    let is_selected = match selected_room_id.read().as_ref() {
        Some(selected_room_id) => *selected_room_id == *room_id,
        None => false,
    };

    let avatar = if let Some(content) = room.avatar() {
        let encoded = general_purpose::STANDARD.encode(content);
        rsx! {
            div {
                class: ClassName::CONVERSATION_AVATAR_IMAGE,
                background_image: format!("url(data:image/jpeg;base64,{encoded})"),
            }
        }
    } else {
        let placeholder = room_name
            .unwrap_or("?".to_string())
            .to_uppercase()
            .chars()
            .next()
            .unwrap_or('?')
            .to_string();

        debug!("Use of {} placeholder for {}", placeholder, room_id);

        rsx! {
            div {
                class: ClassName::CONVERSATION_AVATAR_IMAGE,

                {placeholder}
            }
        }
    };

    let classes = [
        ClassName::CONVERSATION_AVATAR,
        if is_selected { ClassName::SELECTED } else { "" },
    ];
    let classes_str = classes.join(" ");

    let on_press = {
        let room_id = room_id.clone();
        move || {
            on_selected.map(|c| c.call(room_id.as_ref().clone()));
        }
    };

    let on_long_press = move || {
        on_pressed.map(|c| c.call(room_id.as_ref().clone()));
    };

    let long_press_hook = use_long_press(long_press_duration, on_press, on_long_press);

    rsx! {
        div {
            class: "{classes_str}",

            ..long_press_hook.handlers,

            {avatar}
            {invited_badge}
        }
    }
}

#[component]
pub fn ConversationsCarousel(
    on_selected_conversation: EventHandler<RoomId>,
    on_pressed_conversation: EventHandler<RoomId>,
) -> Element {
    let mut ordered_rooms = use_signal(Vec::<RoomId>::new);

    use_effect(move || {
        let rooms = use_context::<Signal<Vec<RoomId>>>();
        let rooms = rooms.read();
        for room in rooms.iter() {
            if !ordered_rooms.peek().contains(room) {
                ordered_rooms.push(room.clone());
            }
        }
        ordered_rooms.retain(|room| rooms.contains(room));
    });

    let ordered_rooms = ordered_rooms.read();
    let rendered_avatars = ordered_rooms.iter().map(|room| {
        rsx! {
            ConversationAvatar {
                room_id: room.clone(),
                on_selected: on_selected_conversation,
                on_pressed: on_pressed_conversation,
            }
        }
    });

    rsx! {
        div {
            class: ClassName::SPACE_CONVERSATIONS_CAROUSEL,
            // TODO: Needed?
            onscroll: move |_| {
                // Catch scrolling events.
            },
            {rendered_avatars}
        }
    }
}

// If id is None, the Space will handle all the Conversation which have no parent (Space).
#[component]
pub fn Space(id: Option<SpaceId>, on_pressed_conversation: EventHandler<RoomId>) -> Element {
    let mut selected_room_id = use_context_provider(|| Signal::new(None::<RoomId>));
    let mut displayed_rooms = use_context_provider(|| Signal::new(Vec::<RoomId>::new()));

    let name = if let Some(id) = id {
        let space = STORE.read().spaces().get(&id).unwrap().signal();
        use_effect(move || {
            let rooms = STORE.peek().rooms();
            let room_ids = space.room_ids();
            for room_id in room_ids {
                if rooms.contains_key(&room_id) {
                    displayed_rooms.write().push(room_id);
                }
            }
        });
        space.name()
    } else {
        use_effect(move || {
            let rooms = STORE.read().rooms();
            for room in rooms.values() {
                if room.signal().spaces().is_empty() {
                    let room_id = room.signal().id();
                    displayed_rooms.write().push(room_id);
                }
            }
        });
        Some("Home".to_string())
    };

    let on_selected_conversation = move |room_id: RoomId| {
        STORE.write().on_selected_room(room_id.clone());
        selected_room_id.set(Some(room_id));
    };

    let mut space_classes: [&str; 2] = [ClassName::SPACE, ""];

    let mut selected_room_name = "".to_string();

    if let Some(room_id) = selected_room_id.read().as_ref() {
        space_classes[1] = ClassName::DISPLAY_CONVERSATION_NAME;

        if let Some(room) = STORE.read().rooms().get(room_id) {
            let room = room.signal();

            if let Some(name) = room.name() {
                selected_room_name = name;
            } else {
                debug!("No name set for {} room", &room_id);
                selected_room_name = room_id.to_string();
            }
        } else {
            warn!("No room found for the {} id", &room_id);
        }
    }

    let classes_str = space_classes.join(" ");

    rsx! {
        div {
            class: "{classes_str}",

            // Deselect the conversation on clicks outside of the ConversationAvatar
            onclick: move |_| {
                selected_room_id.set(None);
            },

            div {
                class: ClassName::SPACE_NAME,
                p {
                    {name}
                }
            }
            ConversationsCarousel {
                on_selected_conversation,
                on_pressed_conversation,
            }
            div {
                class: ClassName::SPACE_CONVERSATION_NAME,
                p {
                    {selected_room_name}
                }
            }
        }
    }
}

#[component]
pub fn Spaces(on_pressed_conversation: EventHandler<RoomId>) -> Element {
    let spaces = STORE.read().spaces();
    let space_ids = spaces.keys().clone().last();

    let rendered_spaces = space_ids.map(|id| {
        rsx! {
            Space { id: id.clone(), on_pressed_conversation }
        }
    });

    rsx! {
        div {
            class: ClassName::SPACES,

            {rendered_spaces}

            Space { on_pressed_conversation }
        }
    }
}

#[component]
pub fn Search() -> Element {
    rsx! {
        div {
            class: ClassName::SEARCH,

            div {
                class: ClassName::SEARCH_TEXT,

                TextInput {}
            }

            div {
                class: ClassName::SEARCH_BUTTON,
                Button {
                    SearchIcon {}
                }
            }
        }
    }
}

#[component]
fn ConversationOptionsMenu(
    room_id: RoomId,
    on_close: EventHandler,
    on_join: EventHandler,
) -> Element {
    let room = STORE.read().rooms().get(&room_id).unwrap().signal();

    let topic = room.topic().unwrap_or("<No topic set>".to_string());

    rsx! {
        div {
            class: ClassName::CONVERSATION_OPTIONS_MENU,

            div {
                class: ClassName::CONVERSATION_OPTIONS_MENU_INNER,

                div {
                    class: ClassName::CONVERSATION_OPTIONS_MENU_INNER_AVATAR,
                    ConversationAvatar { room_id }
                }

                div {
                    class: ClassName::CONVERSATION_OPTIONS_MENU_INNER_NAME,
                    p {
                        {room.name()}
                    }
                }

                div {
                    class: ClassName::CONVERSATION_OPTIONS_MENU_INNER_TOPIC,
                    p {
                        {topic}
                    }
                }

                div {
                    class: ClassName::CONVERSATION_OPTIONS_MENU_INNER_CONFIG,
                    p {
                        "Coming soon..."
                    }
                }

                div {
                    class: ClassName::CONVERSATION_OPTIONS_MENU_INNER_CLOSE_BUTTON,
                    RejectButton {
                        onclick: move |_| on_close(())
                    }
                }

                div {
                    class: ClassName::CONVERSATION_OPTIONS_MENU_INNER_JOIN_BUTTON,
                    JoinButton {
                        onclick: move |_| {
                            on_join(());
                            on_close(());
                        }
                    }
                }
            }
        }
    }
}

pub fn Conversations() -> Element {
    let mut room_id = use_signal(|| None::<RoomId>);

    let on_menu_close = move |_| {
        room_id.set(None);
    };

    let on_menu_join = move |_| async move {
        let rooms = STORE.read().rooms();
        if let Some(room_id) = room_id.read().to_owned() {
            if let Some(room) = rooms.get(&room_id) {}
        }
    };

    let on_pressed_conversation = move |id: RoomId| {
        room_id.set(Some(id));
    };

    let menu = match room_id.read().as_ref() {
        Some(room_id) => {
            let room_id = room_id.clone();
            rsx! {
                ConversationOptionsMenu { room_id, on_close: on_menu_close, on_join: on_menu_join }
            }
        }
        None => VNode::empty(),
    };

    rsx! {
        style { {STYLE_SHEET} }

        div {
            class: ClassName::CONVERSATIONS,

            div {
                class: ClassName::CONVERSATIONS_ACCOUNT,
                Account {}
            }

            div {
                class: ClassName::CONVERSATIONS_SPACES,
                Spaces { on_pressed_conversation }
            }

            div {
                class: ClassName::CONVERSATIONS_SEARCH,
                Search {}
            }
        }
        {menu}
    }
}