use crate::data_provider::import::{load_groups, ImportData};
use crate::dictionary::app_data_dir;
use crate::import::ImportMessage::*;
use crate::navigation::{NavigatedPage, Page, RootMessage};
use crate::styling::*;
use crate::AppState;
use iced::widget::scrollable;
use iced::widget::{button, column, row, text};
use iced::{Element, Task};
use iced_core::Alignment::Center;
use rfd::AsyncFileDialog;
use rusqlite::Connection;
use std::fs::{File, OpenOptions};
use std::io::BufReader;
use std::path::PathBuf;
use std::sync::{Arc, Mutex};
use tokio::task::spawn_blocking;
use zip::ZipArchive;

#[derive(Clone)]
pub struct ImportState {
    state: Arc<Mutex<AppState>>,
    path: Option<PathBuf>,
    import_data: Option<ImportData>,
    selected_index: usize,
}

#[derive(Clone)]
pub enum ImportMessage {
    Back,
    SelectFile,
    UpdateFile(PathBuf),
    UpdateImport(ImportData),
}

impl NavigatedPage<ImportMessage> for ImportState {
    fn navigate(&self, message: &ImportMessage) -> Option<Page> {
        if let Back = message {
            return Some(Page::PreviousPage);
        }
        None
    }

    fn navigated(&mut self) {}

    fn update(&mut self, message: ImportMessage) -> Task<RootMessage> {
        match message {
            Back => {}
            UpdateFile(path) => {
                self.path = Some(path);
                return self.load_package();
            }
            SelectFile => return Self::select_import_file(),
            UpdateImport(import) => {
                self.import_data = Some(import);
            }
        }
        Task::none()
    }

    fn view(&self) -> Element<'_, ImportMessage> {
        back_overlay(
            scrollable(
                column![
                    row![
                        button("Выбрать файл").style(jl_button).on_press(SelectFile),
                        text!("{}", {
                            if let Some(path) = &self.path {
                                path.to_string_lossy().to_string()
                            } else {
                                "Файл не выбран".to_string()
                            }
                        })
                    ]
                    .align_y(Center)
                    .spacing(DEFAULT_SPACING)
                ]
                .spacing(DEFAULT_SPACING),
            )
            .into(),
            Back,
        )
    }
}
impl ImportState {
    pub fn new(state: Arc<Mutex<AppState>>) -> ImportState {
        ImportState {
            state,
            path: None,
            import_data: None,
            selected_index: 0
        }
    }

    fn select_import_file() -> Task<RootMessage> {
        Task::perform(
            async {
                let file = AsyncFileDialog::new()
                    .add_filter("Anki", &["apkg"])
                    .pick_file()
                    .await;
                if let Some(file) = file {
                    return Some(file.path().into());
                }
                None
            },
            |result| {
                if let Some(path) = result {
                    RootMessage::Import(UpdateFile(path))
                } else {
                    RootMessage::None
                }
            },
        )
    }

    pub fn load_package(&self) -> Task<RootMessage> {
        let path = self.path.clone().unwrap();
        Task::perform(
            async {
                spawn_blocking(move || {
                    Self::extract_import_file(path)?;
                    let data = Self::read_import_file()?;
                    return Ok(data);
                })
                .await
                .unwrap()
            },
            |result: Result<ImportData, ()>| {
                if let Ok(import) = result {
                    RootMessage::Import(UpdateImport(import))
                } else {
                    RootMessage::None
                }
            },
        )
    }

    fn extract_import_file(path: PathBuf) -> Result<(), ()> {
        let file = File::open(path).map_err(|_| ())?;
        let reader = BufReader::new(file);
        let mut archive = ZipArchive::new(reader).map_err(|_| ())?;
        let db_file = archive.by_name("collection.anki2");
        if let Ok(mut file) = db_file {
            let temp_file_path = app_data_dir().join("import");
            let mut temp_file = OpenOptions::new()
                .write(true)
                .create(true)
                .truncate(true)
                .open(&temp_file_path)
                .map_err(|_| ())?;
            std::io::copy(&mut file, &mut temp_file).map_err(|_| ())?;
            Ok(())
        } else {
            Err(())
        }
    }
    fn read_import_file() -> Result<ImportData, ()> {
        let temp_file_path = app_data_dir().join("import");
        let connection = Connection::open(&temp_file_path).map_err(|_| ())?;
        let data = load_groups(&connection);
        Ok(data)
    }
}