use cursive::view::Resizable as _;
use cursive::views::{
    Button, Dialog, LinearLayout, NamedView, Panel, ScrollView, SelectView, TextView,
};
use cursive::{event, Cursive};
use utils::hash::Hashable as _;

use crate::actions::NetworkError;
use crate::message::MessageSanitized;
use crate::{get_appdata, message, Appdata, MAX_MESSAGE_LENGTH, MAX_USERNAME_LENGTH};

pub const USERS_PANEL_ID: &str = "users_view_id";
pub const MESSAGE_PANEL_ID: &str = "message_view_id";
pub const CHANNEL_VIEW_ID: &str = "channel_view_id";
pub const CHANNEL_NEW_FIELD_ID: &str = "channel_new_field_id";
pub const CHANNEL_NEW_BUTTON_ID: &str = "CHANNEL_NEW_BUTTON_ID";
pub const CHANNEL_CURRENT_PANEL_ID: &str = "CHANNEL_CURRENT_PANEL_ID";
pub const INPUT_FIELD_ID: &str = "input_field_id";
pub const INPUT_PANEL_ID: &str = "input_panel_id";
pub const INPUT_BUTTON_ID: &str = "input_button_id";
pub const INPUT_CLEAR_BUTTON_ID: &str = "input_clear_button_id";
pub const LANGUAGE_BUTTON_ID: &str = "language_button_id";
pub const CURRENT_USERNAME_PANEL_ID: &str = "current_username_view_id";
pub const USERNAME_FIELD_ID: &str = "username_field_id";
pub const USERNAME_BUTTON_ID: &str = "username_button_id";
pub const REFRESH_BUTTON_ID: &str = "refresh_button_id";
pub const BLOCKED_WORDS_BUTTON_ID: &str = "blocked_words_view_id";
pub const SERVER_SETTINGS_ADDRESS_FIELD_ID: &str = "server_settings_address_field_id";
pub const SERVER_SETTINGS_REFRESH_FIELD_ID: &str = "server_settings_refresh_field_id";
pub const SERVER_SETTINGS_PASSWORD_FIELD_ID: &str = "SERVER_SETTINGS_PASSWORD_FIELD_ID";
pub const SERVER_SETTINGS_BUTTON_ID: &str = "server_settings_button_id";

pub const DIALOGUE_MIN_SIZE: (u16, u16) = (20, 5);
pub const SERVER_SETTINGS_FIELD_SIZE: (usize, usize) = (60, 1);
pub const USER_PANEL_SIZE: usize = crate::MAX_USERNAME_LENGTH + 2;

#[allow(unused)]
pub enum Labels {
    Ok,
    Cancel,
    Close,
    Submit,
    Send,
    New,
    Clear,
    Error,
    User,
    Users,
    Message,
    Messages,
    Channel,
    Channels,
    NewChannel,
    InvalidChannelNameExplination,
    TypeAMessage,
    SetLanguage,
    SetUsername,
    InvalidUsernameExplination,
    Username,
    InvalidMessage,
    FailedToSendMessage(NetworkError),
    FailedToLoadMessages(NetworkError),
    RefreshButton,
    BlockedWords,
    ServerSettings,
    ServerAddress,
    ServerRefreshRate,
    Password,
}

#[derive(Debug, Clone, Copy)]
pub enum Language {
    English,
    Dutch,
    Japanese,
}

impl Labels {
    // TODO: Double check the translations
    pub fn localize<'a>(&self, language: Language) -> String {
        let buf: [String; 3];

        let set: [&str; 3] = match self {
            Labels::Ok => ["OK", "OK", "OK"],
            Labels::Cancel => ["Cancel", "Annuleren", "キャンセル"],
            Labels::Close => ["Close", "Sluiten", "閉じる"],
            Labels::Error => ["Error", "Fout", "エラー"],
            Labels::User => ["User", "Gebruiker", "ユーザー"],
            Labels::Messages => ["Messages", "Berichten", "メッセージ"],
            Labels::Message => ["Message", "Bericht", "メッセージ"],
            Labels::Users => ["Users", "Gebruikers", "ユーザー"],
            Labels::TypeAMessage => [
                "Type a message",
                "Typ een bericht",
                "メッセージを入力してください",
            ],
            Labels::SetUsername => [
                "Set username",
                "Stel gebruikersnaam in",
                "ユーザー名を設定する",
            ],
            Labels::Send => ["Send", "Verzenden", "送信する"],
            Labels::Clear => ["Clear", "Wissen", "クリア"],
            Labels::Username => ["Username", "Gebruikersnaam", "ユーザー名"],
            Labels::SetLanguage => ["Set language", "Stel taal in", "言語を設定する"],
            Labels::FailedToSendMessage(e) => {
                let reason_buf: [String; 3];

                match e {
                    NetworkError::ReqwestError(_) => {
                        reason_buf = [
                            "Connection error.".to_string(),
                            "Verbindingsfout.".to_string(),
                            "接続エラー。".to_string(),
                        ];
                    }
                    NetworkError::StatusCodeError(code) => {
                        // NOTE: Needs to match the server
                        if *code == 400 {
                            reason_buf = [
                                "Message too long.".to_string(),
                                "Bericht te lang.".to_string(),
                                "メッセージが長すぎます。".to_string(),
                            ];
                        } else {
                            reason_buf = [
                                format!("Status code: {code}"),
                                format!("Statuscode: {code}"),
                                format!("ステータスコード: {code}"),
                            ]
                        }
                    }
                    NetworkError::InvalidUrl => {
                        reason_buf = [
                            "Invalid URL.".to_string(),
                            "Ongeldig URL.".to_string(),
                            "無効なURL。".to_string(),
                        ];
                    }
                    NetworkError::EncryptionError(_) => {
                        reason_buf = [
                            "Encryption error.".to_string(),
                            "Encryptiefout.".to_string(),
                            "暗号化エラー。".to_string(),
                        ];
                    }
                };

                buf = [
                    format!("Failed to send message. {}", reason_buf[0]),
                    format!("Bericht verzenden mislukt. {}", reason_buf[1]),
                    format!("メッセージの送信に失敗しました。 {}", reason_buf[2]),
                ];

                [buf[0].as_str(), buf[1].as_str(), buf[2].as_str()]
            }
            Labels::FailedToLoadMessages(error) => {
                let reason_buf: [String; 3];

                match error {
                    NetworkError::ReqwestError(_) => {
                        reason_buf = [
                            "Connection error.".to_string(),
                            "Verbindingsfout.".to_string(),
                            "接続エラー。".to_string(),
                        ];
                    }
                    NetworkError::StatusCodeError(code) => {
                        reason_buf = [
                            format!("Status code: {code}"),
                            format!("Statuscode: {code}"),
                            format!("ステータスコード: {code}"),
                        ];
                    }
                    NetworkError::InvalidUrl => {
                        reason_buf = [
                            "Invalid URL.".to_string(),
                            "Ongeldig URL.".to_string(),
                            "無効なURL。".to_string(),
                        ];
                    }
                    NetworkError::EncryptionError(_) => {
                        reason_buf = [
                            "Decryption error.".to_string(),
                            "Fout bij het ontcijferen.".to_string(),
                            "復号エラー".to_string(),
                        ];
                    }
                };

                buf = [
                    format!("Failed to load messages. {}", reason_buf[0]),
                    format!("Berichten laden mislukt. {}", reason_buf[1]),
                    format!("メッセージの読み込みに失敗しました。 {}", reason_buf[2]),
                ];

                [buf[0].as_str(), buf[1].as_str(), buf[2].as_str()]
            }
            Labels::RefreshButton => ["Refresh", "Vernieuwen", "更新する"],
            Labels::InvalidUsernameExplination => {
                buf = [
                    r"Invalid username. Must match ^[a-zA-Z0-9#_\-\.]{2,${MAX_USERNAME_LENGTH}}$"
                        .replace("${MAX_USERNAME_LENGTH}", &MAX_USERNAME_LENGTH.to_string()),
                    r"Ongeldige gebruikersnaam. Moet overeenkomen met ^[a-zA-Z0-9#_\-\.]{2,${MAX_USERNAME_LENGTH}}$"
                        .replace("${MAX_USERNAME_LENGTH}", &MAX_USERNAME_LENGTH.to_string()),
                    r"無効なユーザー名。 ^[a-zA-Z0-9#_\-\.]{2,${MAX_USERNAME_LENGTH}}$ に一致する必要があります"
                        .replace("${MAX_USERNAME_LENGTH}", &MAX_USERNAME_LENGTH.to_string()),
                ];

                [buf[0].as_str(), buf[1].as_str(), buf[2].as_str()]
            }
            Labels::InvalidMessage => {
                buf = [
                    "Invalid message. Must contain fewer than ${MAX_MESSAGE_LENGTH} characters"
                        .replace("${MAX_MESSAGE_LENGTH}", &MAX_MESSAGE_LENGTH.to_string()),
                    "Ongeldig bericht. Moet minder dan ${MAX_MESSAGE_LENGTH} tekens bevatten"
                        .replace("${MAX_MESSAGE_LENGTH}", &MAX_MESSAGE_LENGTH.to_string()),
                    "無効なメッセージ。 ${MAX_MESSAGE_LENGTH}文字未満である必要があります"
                        .replace("${MAX_MESSAGE_LENGTH}", &MAX_MESSAGE_LENGTH.to_string()),
                ];

                [buf[0].as_str(), buf[1].as_str(), buf[2].as_str()]
            }
            Labels::BlockedWords => [
                "Blocked words",
                "Geblokkeerde woorden",
                "ブロックされた単語",
            ],
            Labels::Submit => ["Submit", "Indienen", "提出する"],
            Labels::ServerSettings => ["Server settings", "Serverinstellingen", "サーバー設定"],
            Labels::ServerAddress => [
                "Server address (IP:Port)",
                "Serveradres (IP:poort)",
                "サーバーアドレス（IP:ポート）",
            ],
            Labels::ServerRefreshRate => [
                "Update rate (seconds)",
                "Updatefrequentie (seconden)",
                "更新率 (秒)",
            ],
            Labels::Channels => ["Channels", "Kanalen", "チャンネル"],
            Labels::NewChannel => ["New Channel", "Nieuw kanaal", "新しいチャンネル"],
            Labels::InvalidChannelNameExplination => {
                buf = [
                    r"Invalid channel name. Must match ^[a-zA-Z0-9#_\-\.]{2,${MAX_USERNAME_LENGTH}}$"
                        .replace("${MAX_USERNAME_LENGTH}", &MAX_USERNAME_LENGTH.to_string()),
                    r"Ongeldige kanaalnaam. Moet overeenkomen met ^[a-zA-Z0-9#_\-\.]{2,${MAX_USERNAME_LENGTH}}$"
                        .replace("${MAX_USERNAME_LENGTH}", &MAX_USERNAME_LENGTH.to_string()),
                    r"無効なチャンネル名。 ^[a-zA-Z0-9#_\-\.]{2,${MAX_USERNAME_LENGTH}}$ に一致する必要があります"
                        .replace("${MAX_USERNAME_LENGTH}", &MAX_USERNAME_LENGTH.to_string()),
                ];

                [buf[0].as_str(), buf[1].as_str(), buf[2].as_str()]
            }
            Labels::New => ["New", "Nieuw", "新"],
            Labels::Channel => ["Channel", "Kanaal", "チャネル"],
            Labels::Password => ["Password", "Wachtwoord", "パスワード"],
        };

        let idx = match language {
            Language::English => 0,
            Language::Dutch => 1,
            Language::Japanese => 2,
        };

        set[idx].to_string()
    }
}

pub fn alert<S>(siv: &mut Cursive, title: S, text: S)
where
    S: Into<String>,
{
    let language = get_appdata(siv).language;

    keybind_setup_close_once(siv);

    siv.add_layer(
        Dialog::text(text)
            .title(title)
            .button(Labels::Close.localize(language), |siv| {
                keybind_close_manual_end(siv, false);
            })
            .min_size((20, 5)),
    );
}

pub fn error<S>(siv: &mut Cursive, text: S)
where
    S: Into<String>,
{
    let language = get_appdata(siv).language;
    alert(siv, Labels::Error.localize(language), text.into());
}

/// Sets up hotkey to close the most recent view
pub fn keybind_setup_close_once(siv: &mut Cursive) {
    siv.with_user_data(|appdata: &mut Appdata| {
        appdata.quick_close_window_count += 1;
    });

    siv.add_global_callback(event::Key::Esc, |siv| {
        keybind_close_manual_end(siv, false);
    });
}

// `close_all` can be removed, it isn't used.
/// Manually close the most recent view and removes the hotkey
pub fn keybind_close_manual_end(siv: &mut Cursive, close_all: bool) {
    siv.with_user_data(|appdata: &mut Appdata| {
        if close_all {
            appdata.quick_close_window_count = 0;
        } else {
            appdata.quick_close_window_count = appdata.quick_close_window_count.saturating_sub(1);
        }
    });

    if get_appdata(siv).quick_close_window_count == 0 {
        siv.clear_global_callbacks(event::Key::Esc);
    }

    siv.pop_layer();
}

pub fn visual_update(siv: &mut Cursive) {
    let appdata = get_appdata(siv);
    let current_channel = appdata.current_channel;
    let language = get_appdata(siv).language;

    // --- Messages ---

    let mut messages: Vec<message::MessageSanitized> = appdata
        .messages
        .clone()
        .values()
        .cloned()
        .map(MessageSanitized::from)
        .collect::<Vec<_>>();
    messages.sort_by(|a, b| a.time.cmp(&b.time));

    // Remove blocked phrases
    for message in messages.iter_mut() {
        message.remove_blocked_phrases(siv);
    }

    siv.call_on_name(
        MESSAGE_PANEL_ID,
        |panel: &mut Panel<ScrollView<SelectView>>| {
            let view = panel.get_inner_mut().get_inner_mut();

            let selected = view.selected_id();

            view.clear();
            for message in messages
                .iter()
                .filter(|x| channel_matches(&x.channel, &current_channel))
            {
                view.add_item(
                    // TODO: Localized timestamps
                    format!(
                        "{:>6} | {}: {}\n",
                        utils::time::timestamp_relative(message.time),
                        message.sender,
                        message.content,
                    ),
                    message.hash().to_string(),
                );
            }

            if let Some(selected) = selected {
                view.set_selection(selected);
            }
        },
    );

    // --- Members list ---

    siv.call_on_name(
        USERS_PANEL_ID,
        |panel: &mut Panel<ScrollView<SelectView>>| {
            let view = panel.get_inner_mut().get_inner_mut();

            let mut senders: Vec<String> = vec![];
            for message in messages
                .iter()
                .filter(|x| channel_matches(&x.channel, &current_channel))
            {
                if senders.contains(&message.sender) {
                    continue;
                }
                senders.push(message.sender.clone());
            }
            senders.sort();

            let selected = view.selected_id();
            view.clear();
            for sender in senders {
                view.add_item(sender.clone(), sender.clone());
            }

            if let Some(selected) = selected {
                view.set_selection(selected);
            }
        },
    );

    // --- Channels ---

    siv.call_on_name(
        CHANNEL_VIEW_ID,
        |panel: &mut Panel<ScrollView<SelectView>>| {
            let view = panel.get_inner_mut().get_inner_mut();

            let mut channels = appdata.local_channels.clone();
            for message in messages.iter() {
                if !channels.contains(&message.channel) {
                    channels.push(message.channel.clone());
                }
            }
            channels.sort();

            let selected = view.selected_id();
            view.clear();

            for channel in channels {
                view.add_item(channel.clone(), channel.clone());
            }

            if let Some(selected) = selected {
                view.set_selection(selected);
            }
        },
    );

    // --- Current channel ---

    let appdata_c = get_appdata(siv);
    siv.call_on_name(
        CHANNEL_CURRENT_PANEL_ID,
        |view: &mut NamedView<Panel<TextView>>| {
            view.get_mut()
                .get_inner_mut()
                .set_content(appdata_c.current_channel);

            view.get_mut().set_title(Labels::Channel.localize(language));
        },
    );

    // --- Current username ---

    siv.call_on_name(
        CURRENT_USERNAME_PANEL_ID,
        |view: &mut NamedView<Panel<TextView>>| {
            view.get_mut().get_inner_mut().set_content(appdata.username);
        },
    );

    // --- Localize buttons ---

    for (name, label) in [
        (USERS_PANEL_ID, Labels::Users.localize(language)),
        (MESSAGE_PANEL_ID, Labels::Messages.localize(language)),
        (CHANNEL_VIEW_ID, Labels::Channels.localize(language)),
    ] {
        siv.call_on_name(name, |panel: &mut Panel<ScrollView<SelectView>>| {
            panel.set_title(label);
        });
    }

    siv.call_on_name(CHANNEL_NEW_BUTTON_ID, |view: &mut NamedView<Button>| {
        view.get_mut()
            .set_label(Labels::NewChannel.localize(language));
    });

    siv.call_on_name(INPUT_PANEL_ID, |panel: &mut Panel<LinearLayout>| {
        panel.set_title(Labels::TypeAMessage.localize(language));
    });

    siv.call_on_name(INPUT_BUTTON_ID, |view: &mut NamedView<Button>| {
        view.get_mut().set_label(Labels::Send.localize(language));
    });

    siv.call_on_name(INPUT_CLEAR_BUTTON_ID, |view: &mut NamedView<Button>| {
        view.get_mut().set_label(Labels::Clear.localize(language));
    });

    siv.call_on_name(LANGUAGE_BUTTON_ID, |view: &mut NamedView<Button>| {
        view.get_mut()
            .set_label(Labels::SetLanguage.localize(language));
    });

    siv.call_on_name(USERNAME_BUTTON_ID, |view: &mut NamedView<Button>| {
        view.get_mut()
            .set_label(Labels::SetUsername.localize(language));
    });

    siv.call_on_name(REFRESH_BUTTON_ID, |view: &mut NamedView<Button>| {
        view.get_mut()
            .set_label(Labels::RefreshButton.localize(language));
    });

    siv.call_on_name(BLOCKED_WORDS_BUTTON_ID, |view: &mut NamedView<Button>| {
        view.get_mut()
            .set_label(Labels::BlockedWords.localize(language));
    });

    siv.call_on_name(
        CURRENT_USERNAME_PANEL_ID,
        |view: &mut NamedView<Panel<TextView>>| {
            view.get_mut()
                .set_title(Labels::Username.localize(language));
        },
    );

    siv.call_on_name(SERVER_SETTINGS_BUTTON_ID, |view: &mut NamedView<Button>| {
        view.get_mut()
            .set_label(Labels::ServerSettings.localize(language));
    });
}

pub fn change_language(siv: &mut Cursive, language: Language) {
    siv.with_user_data(|appdata: &mut Appdata| {
        appdata.language = language;
    })
    .expect("Failed to set language.");

    visual_update(siv);
}

pub fn channel_matches(message_channel: &str, reference_channel: &str) -> bool {
    message_channel == reference_channel
}