use core::f32;
use std::collections::HashMap;

use egui::{
    pos2, vec2, Align, Button, Color32, FontId, Id, ImageSource, Margin, Pos2, Rect, RichText,
    Separator, Ui, Vec2, Widget,
};
use enostr::Pubkey;
use nostrdb::{Ndb, Transaction};

use crate::{
    login_manager::AcquireKeyState,
    timeline::{PubkeySource, Timeline, TimelineKind},
    ui::anim::ICON_EXPANSION_MULTIPLE,
    Damus,
};

use notedeck::{AppContext, ImageCache, NotedeckTextStyle, UserAccount};

use super::{anim::AnimationHelper, padding, ProfilePreview};

pub enum AddColumnResponse {
    Timeline(Timeline),
    UndecidedNotification,
    ExternalNotification,
    Hashtag,
    UndecidedIndividual,
    ExternalIndividual,
}

pub enum NotificationColumnType {
    Home,
    External,
}

#[derive(Clone, Debug)]
enum AddColumnOption {
    Universe,
    UndecidedNotification,
    ExternalNotification,
    Notification(PubkeySource),
    Home(PubkeySource),
    UndecidedHashtag,
    Hashtag(String),
    UndecidedIndividual,
    ExternalIndividual,
    Individual(PubkeySource),
}

#[derive(Clone, Copy, Eq, PartialEq, Debug)]
pub enum AddColumnRoute {
    Base,
    UndecidedNotification,
    ExternalNotification,
    Hashtag,
    UndecidedIndividual,
    ExternalIndividual,
}

impl AddColumnOption {
    pub fn take_as_response(
        self,
        ndb: &Ndb,
        cur_account: Option<&UserAccount>,
    ) -> Option<AddColumnResponse> {
        match self {
            AddColumnOption::Universe => TimelineKind::Universe
                .into_timeline(ndb, None)
                .map(AddColumnResponse::Timeline),
            AddColumnOption::Notification(pubkey) => TimelineKind::Notifications(pubkey)
                .into_timeline(ndb, cur_account.map(|a| a.pubkey.bytes()))
                .map(AddColumnResponse::Timeline),
            AddColumnOption::UndecidedNotification => {
                Some(AddColumnResponse::UndecidedNotification)
            }
            AddColumnOption::Home(pubkey) => {
                let tlk = TimelineKind::contact_list(pubkey);
                tlk.into_timeline(ndb, cur_account.map(|a| a.pubkey.bytes()))
                    .map(AddColumnResponse::Timeline)
            }
            AddColumnOption::ExternalNotification => Some(AddColumnResponse::ExternalNotification),
            AddColumnOption::UndecidedHashtag => Some(AddColumnResponse::Hashtag),
            AddColumnOption::Hashtag(hashtag) => TimelineKind::Hashtag(hashtag)
                .into_timeline(ndb, None)
                .map(AddColumnResponse::Timeline),
            AddColumnOption::UndecidedIndividual => Some(AddColumnResponse::UndecidedIndividual),
            AddColumnOption::ExternalIndividual => Some(AddColumnResponse::ExternalIndividual),
            AddColumnOption::Individual(pubkey_source) => {
                let tlk = TimelineKind::profile(pubkey_source);
                tlk.into_timeline(ndb, cur_account.map(|a| a.pubkey.bytes()))
                    .map(AddColumnResponse::Timeline)
            }
        }
    }
}

pub struct AddColumnView<'a> {
    key_state_map: &'a mut HashMap<Id, AcquireKeyState>,
    ndb: &'a Ndb,
    img_cache: &'a mut ImageCache,
    cur_account: Option<&'a UserAccount>,
}

impl<'a> AddColumnView<'a> {
    pub fn new(
        key_state_map: &'a mut HashMap<Id, AcquireKeyState>,
        ndb: &'a Ndb,
        img_cache: &'a mut ImageCache,
        cur_account: Option<&'a UserAccount>,
    ) -> Self {
        Self {
            key_state_map,
            ndb,
            img_cache,
            cur_account,
        }
    }

    pub fn ui(&mut self, ui: &mut Ui) -> Option<AddColumnResponse> {
        let mut selected_option: Option<AddColumnResponse> = None;
        for column_option_data in self.get_base_options() {
            let option = column_option_data.option.clone();
            if self.column_option_ui(ui, column_option_data).clicked() {
                selected_option = option.take_as_response(self.ndb, self.cur_account);
            }

            ui.add(Separator::default().spacing(0.0));
        }

        selected_option
    }

    fn notifications_ui(&mut self, ui: &mut Ui) -> Option<AddColumnResponse> {
        let mut selected_option: Option<AddColumnResponse> = None;
        for column_option_data in self.get_notifications_options() {
            let option = column_option_data.option.clone();
            if self.column_option_ui(ui, column_option_data).clicked() {
                selected_option = option.take_as_response(self.ndb, self.cur_account);
            }

            ui.add(Separator::default().spacing(0.0));
        }

        selected_option
    }

    fn external_notification_ui(&mut self, ui: &mut Ui) -> Option<AddColumnResponse> {
        let id = ui.id().with("external_notif");
        self.external_ui(ui, id, |pubkey| {
            AddColumnOption::Notification(PubkeySource::Explicit(pubkey))
        })
    }

    fn individual_ui(&mut self, ui: &mut Ui) -> Option<AddColumnResponse> {
        let mut selected_option: Option<AddColumnResponse> = None;
        for column_option_data in self.get_individual_options() {
            let option = column_option_data.option.clone();
            if self.column_option_ui(ui, column_option_data).clicked() {
                selected_option = option.take_as_response(self.ndb, self.cur_account);
            }

            ui.add(Separator::default().spacing(0.0));
        }

        selected_option
    }

    fn external_individual_ui(&mut self, ui: &mut Ui) -> Option<AddColumnResponse> {
        let id = ui.id().with("external_individual");

        self.external_ui(ui, id, |pubkey| {
            AddColumnOption::Individual(PubkeySource::Explicit(pubkey))
        })
    }

    fn external_ui(
        &mut self,
        ui: &mut Ui,
        id: egui::Id,
        to_option: fn(Pubkey) -> AddColumnOption,
    ) -> Option<AddColumnResponse> {
        padding(16.0, ui, |ui| {
            let key_state = self.key_state_map.entry(id).or_default();

            let text_edit = key_state.get_acquire_textedit(|text| {
                egui::TextEdit::singleline(text)
                    .hint_text(
                        RichText::new("Enter the user's key (npub, hex, nip05) here...")
                            .text_style(NotedeckTextStyle::Body.text_style()),
                    )
                    .vertical_align(Align::Center)
                    .desired_width(f32::INFINITY)
                    .min_size(Vec2::new(0.0, 40.0))
                    .margin(Margin::same(12.0))
            });

            ui.add(text_edit);

            key_state.handle_input_change_after_acquire();
            key_state.loading_and_error_ui(ui);

            if key_state.get_login_keypair().is_none() && ui.add(find_user_button()).clicked() {
                key_state.apply_acquire();
            }

            let resp = if let Some(keypair) = key_state.get_login_keypair() {
                let txn = Transaction::new(self.ndb).expect("txn");
                if let Ok(profile) = self.ndb.get_profile_by_pubkey(&txn, keypair.pubkey.bytes()) {
                    egui::Frame::window(ui.style())
                        .outer_margin(Margin {
                            left: 4.0,
                            right: 4.0,
                            top: 12.0,
                            bottom: 32.0,
                        })
                        .show(ui, |ui| {
                            ProfilePreview::new(&profile, self.img_cache).ui(ui);
                        });
                }

                if ui.add(add_column_button()).clicked() {
                    to_option(keypair.pubkey).take_as_response(self.ndb, self.cur_account)
                } else {
                    None
                }
            } else {
                None
            };
            if resp.is_some() {
                self.key_state_map.remove(&id);
            };
            resp
        })
        .inner
    }

    fn column_option_ui(&mut self, ui: &mut Ui, data: ColumnOptionData) -> egui::Response {
        let icon_padding = 8.0;
        let min_icon_width = 32.0;
        let height_padding = 12.0;
        let max_width = ui.available_width();
        let title_style = NotedeckTextStyle::Body;
        let desc_style = NotedeckTextStyle::Button;
        let title_min_font_size = notedeck::fonts::get_font_size(ui.ctx(), &title_style);
        let desc_min_font_size = notedeck::fonts::get_font_size(ui.ctx(), &desc_style);

        let max_height = {
            let max_wrap_width =
                max_width - ((icon_padding * 2.0) + (min_icon_width * ICON_EXPANSION_MULTIPLE));
            let title_max_font = FontId::new(
                title_min_font_size * ICON_EXPANSION_MULTIPLE,
                title_style.font_family(),
            );
            let desc_max_font = FontId::new(
                desc_min_font_size * ICON_EXPANSION_MULTIPLE,
                desc_style.font_family(),
            );
            let max_desc_galley = ui.fonts(|f| {
                f.layout(
                    data.description.to_string(),
                    desc_max_font,
                    Color32::WHITE,
                    max_wrap_width,
                )
            });

            let max_title_galley = ui.fonts(|f| {
                f.layout(
                    data.title.to_string(),
                    title_max_font,
                    Color32::WHITE,
                    max_wrap_width,
                )
            });

            let desc_font_max_size = max_desc_galley.rect.height();
            let title_font_max_size = max_title_galley.rect.height();
            title_font_max_size + desc_font_max_size + (2.0 * height_padding)
        };

        let helper = AnimationHelper::new(ui, data.title, vec2(max_width, max_height));
        let animation_rect = helper.get_animation_rect();

        let cur_icon_width = helper.scale_1d_pos(min_icon_width);
        let painter = ui.painter_at(animation_rect);

        let cur_icon_size = vec2(cur_icon_width, cur_icon_width);
        let cur_icon_x_pos = animation_rect.left() + (icon_padding) + (cur_icon_width / 2.0);

        let title_cur_font = FontId::new(
            helper.scale_1d_pos(title_min_font_size),
            title_style.font_family(),
        );

        let desc_cur_font = FontId::new(
            helper.scale_1d_pos(desc_min_font_size),
            desc_style.font_family(),
        );

        let wrap_width = max_width - (cur_icon_width + (icon_padding * 2.0));
        let text_color = ui.ctx().style().visuals.text_color();
        let fallback_color = ui.ctx().style().visuals.weak_text_color();

        let title_galley = painter.layout(
            data.title.to_string(),
            title_cur_font,
            text_color,
            wrap_width,
        );
        let desc_galley = painter.layout(
            data.description.to_string(),
            desc_cur_font,
            text_color,
            wrap_width,
        );

        let galley_heights = title_galley.rect.height() + desc_galley.rect.height();

        let cur_height_padding = (animation_rect.height() - galley_heights) / 2.0;
        let corner_x_pos = cur_icon_x_pos + (cur_icon_width / 2.0) + icon_padding;
        let title_corner_pos = Pos2::new(corner_x_pos, animation_rect.top() + cur_height_padding);
        let desc_corner_pos = Pos2::new(
            corner_x_pos,
            title_corner_pos.y + title_galley.rect.height(),
        );

        let icon_cur_y = animation_rect.top() + cur_height_padding + (galley_heights / 2.0);
        let icon_img = egui::Image::new(data.icon).fit_to_exact_size(cur_icon_size);
        let icon_rect = Rect::from_center_size(pos2(cur_icon_x_pos, icon_cur_y), cur_icon_size);

        icon_img.paint_at(ui, icon_rect);
        painter.galley(title_corner_pos, title_galley, fallback_color);
        painter.galley(desc_corner_pos, desc_galley, fallback_color);

        helper.take_animation_response()
    }

    fn get_base_options(&self) -> Vec<ColumnOptionData> {
        let mut vec = Vec::new();
        vec.push(ColumnOptionData {
            title: "Universe",
            description: "See the whole nostr universe",
            icon: egui::include_image!("../../../../assets/icons/universe_icon_dark_4x.png"),
            option: AddColumnOption::Universe,
        });

        if let Some(acc) = self.cur_account {
            let source = if acc.secret_key.is_some() {
                PubkeySource::DeckAuthor
            } else {
                PubkeySource::Explicit(acc.pubkey)
            };

            vec.push(ColumnOptionData {
                title: "Home timeline",
                description: "See recommended notes first",
                icon: egui::include_image!("../../../../assets/icons/home_icon_dark_4x.png"),
                option: AddColumnOption::Home(source.clone()),
            });
        }
        vec.push(ColumnOptionData {
            title: "Notifications",
            description: "Stay up to date with notifications and mentions",
            icon: egui::include_image!("../../../../assets/icons/notifications_icon_dark_4x.png"),
            option: AddColumnOption::UndecidedNotification,
        });
        vec.push(ColumnOptionData {
            title: "Hashtag",
            description: "Stay up to date with a certain hashtag",
            icon: egui::include_image!("../../../../assets/icons/hashtag_icon_4x.png"),
            option: AddColumnOption::UndecidedHashtag,
        });
        vec.push(ColumnOptionData {
            title: "Individual",
            description: "Stay up to date with someone's notes & replies",
            icon: egui::include_image!("../../../../assets/icons/profile_icon_4x.png"),
            option: AddColumnOption::UndecidedIndividual,
        });

        vec
    }

    fn get_notifications_options(&self) -> Vec<ColumnOptionData> {
        let mut vec = Vec::new();

        if let Some(acc) = self.cur_account {
            let source = if acc.secret_key.is_some() {
                PubkeySource::DeckAuthor
            } else {
                PubkeySource::Explicit(acc.pubkey)
            };

            vec.push(ColumnOptionData {
                title: "Your Notifications",
                description: "Stay up to date with your notifications and mentions",
                icon: egui::include_image!(
                    "../../../../assets/icons/notifications_icon_dark_4x.png"
                ),
                option: AddColumnOption::Notification(source),
            });
        }

        vec.push(ColumnOptionData {
            title: "Someone else's Notifications",
            description: "Stay up to date with someone else's notifications and mentions",
            icon: egui::include_image!("../../../../assets/icons/notifications_icon_dark_4x.png"),
            option: AddColumnOption::ExternalNotification,
        });

        vec
    }

    fn get_individual_options(&self) -> Vec<ColumnOptionData> {
        let mut vec = Vec::new();

        if let Some(acc) = self.cur_account {
            let source = if acc.secret_key.is_some() {
                PubkeySource::DeckAuthor
            } else {
                PubkeySource::Explicit(acc.pubkey)
            };

            vec.push(ColumnOptionData {
                title: "Your Notes",
                description: "Keep track of your notes & replies",
                icon: egui::include_image!("../../../../assets/icons/profile_icon_4x.png"),
                option: AddColumnOption::Individual(source),
            });
        }

        vec.push(ColumnOptionData {
            title: "Someone else's Notes",
            description: "Stay up to date with someone else's notes & replies",
            icon: egui::include_image!("../../../../assets/icons/profile_icon_4x.png"),
            option: AddColumnOption::ExternalIndividual,
        });

        vec
    }
}

fn find_user_button() -> impl Widget {
    sized_button("Find User")
}

fn add_column_button() -> impl Widget {
    sized_button("Add")
}

fn sized_button(text: &str) -> impl Widget + '_ {
    move |ui: &mut egui::Ui| -> egui::Response {
        let painter = ui.painter();
        let galley = painter.layout(
            text.to_owned(),
            NotedeckTextStyle::Body.get_font_id(ui.ctx()),
            Color32::WHITE,
            ui.available_width(),
        );

        ui.add_sized(
            galley.rect.expand2(vec2(16.0, 8.0)).size(),
            Button::new(galley).rounding(8.0).fill(crate::colors::PINK),
        )
    }
}

struct ColumnOptionData {
    title: &'static str,
    description: &'static str,
    icon: ImageSource<'static>,
    option: AddColumnOption,
}

pub fn render_add_column_routes(
    ui: &mut egui::Ui,
    app: &mut Damus,
    ctx: &mut AppContext<'_>,
    col: usize,
    route: &AddColumnRoute,
) {
    let mut add_column_view = AddColumnView::new(
        &mut app.view_state.id_state_map,
        ctx.ndb,
        ctx.img_cache,
        ctx.accounts.get_selected_account(),
    );
    let resp = match route {
        AddColumnRoute::Base => add_column_view.ui(ui),
        AddColumnRoute::UndecidedNotification => add_column_view.notifications_ui(ui),
        AddColumnRoute::ExternalNotification => add_column_view.external_notification_ui(ui),
        AddColumnRoute::Hashtag => hashtag_ui(ui, ctx.ndb, &mut app.view_state.id_string_map),
        AddColumnRoute::UndecidedIndividual => add_column_view.individual_ui(ui),
        AddColumnRoute::ExternalIndividual => add_column_view.external_individual_ui(ui),
    };

    if let Some(resp) = resp {
        match resp {
            AddColumnResponse::Timeline(mut timeline) => {
                crate::timeline::setup_new_timeline(
                    &mut timeline,
                    ctx.ndb,
                    &mut app.subscriptions,
                    ctx.pool,
                    ctx.note_cache,
                    app.since_optimize,
                    &ctx.accounts.mutefun(),
                    ctx.accounts
                        .get_selected_account()
                        .as_ref()
                        .map(|sa| &sa.pubkey),
                );
                app.columns_mut(ctx.accounts)
                    .add_timeline_to_column(col, timeline);
            }
            AddColumnResponse::UndecidedNotification => {
                app.columns_mut(ctx.accounts)
                    .column_mut(col)
                    .router_mut()
                    .route_to(crate::route::Route::AddColumn(
                        AddColumnRoute::UndecidedNotification,
                    ));
            }
            AddColumnResponse::ExternalNotification => {
                app.columns_mut(ctx.accounts)
                    .column_mut(col)
                    .router_mut()
                    .route_to(crate::route::Route::AddColumn(
                        AddColumnRoute::ExternalNotification,
                    ));
            }
            AddColumnResponse::Hashtag => {
                app.columns_mut(ctx.accounts)
                    .column_mut(col)
                    .router_mut()
                    .route_to(crate::route::Route::AddColumn(AddColumnRoute::Hashtag));
            }
            AddColumnResponse::UndecidedIndividual => {
                app.columns_mut(ctx.accounts)
                    .column_mut(col)
                    .router_mut()
                    .route_to(crate::route::Route::AddColumn(
                        AddColumnRoute::UndecidedIndividual,
                    ));
            }
            AddColumnResponse::ExternalIndividual => {
                app.columns_mut(ctx.accounts)
                    .column_mut(col)
                    .router_mut()
                    .route_to(crate::route::Route::AddColumn(
                        AddColumnRoute::ExternalIndividual,
                    ));
            }
        };
    }
}

pub fn hashtag_ui(
    ui: &mut Ui,
    ndb: &Ndb,
    id_string_map: &mut HashMap<Id, String>,
) -> Option<AddColumnResponse> {
    padding(16.0, ui, |ui| {
        let id = ui.id().with("hashtag)");
        let text_buffer = id_string_map.entry(id).or_default();

        let text_edit = egui::TextEdit::singleline(text_buffer)
            .hint_text(
                RichText::new("Enter the desired hashtag here")
                    .text_style(NotedeckTextStyle::Body.text_style()),
            )
            .vertical_align(Align::Center)
            .desired_width(f32::INFINITY)
            .min_size(Vec2::new(0.0, 40.0))
            .margin(Margin::same(12.0));
        ui.add(text_edit);

        ui.add_space(8.0);
        if ui
            .add_sized(egui::vec2(50.0, 40.0), add_column_button())
            .clicked()
        {
            let resp = AddColumnOption::Hashtag(text_buffer.to_owned()).take_as_response(ndb, None);
            id_string_map.remove(&id);
            resp
        } else {
            None
        }
    })
    .inner
}