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use colored::*;
use df_st_core::bufreader::{BufReader, Progress, ProgressUpdater};
use failure::Error;
use indicatif::ProgressBar;
#[allow(unused_imports)]
use log::{debug, error, info, trace, warn};
use serde::de::DeserializeOwned;
use std::fs::File;
use std::path::PathBuf;
// use std::io::BufReader;

mod deserializers;
mod df_world;
pub use deserializers::*;
pub use df_world::*;

struct ProgressBarUpdater {
    read_size: u64,
    total_size: u64,
    progress_bar: ProgressBar,
}

impl ProgressUpdater for ProgressBarUpdater {
    fn update(&mut self, value: u64) {
        self.read_size += value;
        self.progress_bar.set_position(self.read_size);
        if self.read_size + 20000 >= self.total_size {
            self.progress_bar.finish_with_message("✔️");
        }
    }
}

fn read_xml_file<C: DeserializeOwned>(
    filename: &PathBuf,
    progress_bar: ProgressBar,
) -> Result<C, Error> {
    let file = File::open(filename)?;
    let metadata = file.metadata()?;
    let total_size = metadata.len();
    progress_bar.set_length(total_size);

    let bar_updater = ProgressBarUpdater {
        read_size: 0,
        total_size,
        progress_bar,
    };

    let progress: Progress<ProgressBarUpdater> = Progress {
        updater: bar_updater,
    };

    let reader = BufReader::new(file, progress);
    let parsed_result = &mut quick_xml::de::Deserializer::from_reader(reader);
    let result: Result<C, _> = serde_path_to_error::deserialize(parsed_result);
    let parsed_object: C = match result {
        Ok(data) => data,
        Err(err) => {
            let path = err.path().to_string();
            error!("Error: {} \nIn: {}", err, path.red());
            if err.to_string().contains("UTF8 error") {
                // Info: https://github.com/DFHack/dfhack/issues/1580
                info!(
                    "This is an known error with DFHack 0.47.04-r1. \
                    It should be fixed in 0.47.04-r2 and later."
                );
            }
            if err.to_string().contains("Unexpected EOF during reading") {
                error!("Error: {} \nIn: {}", err, path);
                panic!("Unexpected EOF during importing.");
            }
            if err.to_string().contains("Expecting Start event") {
                panic!("File is empty.");
            }
            panic!("Error: {} \nIn: {}", err, path);
        }
    };
    Ok(parsed_object)
}

pub fn parse_legends_plus(filename: &PathBuf, progress_bar: ProgressBar) -> DFWorldLegendsPlus {
    match read_xml_file(filename, progress_bar) {
        Result::Ok(data) => data,
        Result::Err(err) => {
            error!("The {} file could not be parsed.", "legends_plus".red());
            panic!("Error in legends_plus: {:?}", err);
        }
    }
}