use crate::parsers::csv::CsvFile;
use crate::banking::account::Account;
use crate::banking::asset::Asset;
use crate::parsers::ini::IniFile;
use std::collections::HashMap;
use rocket_contrib::templates::Template;
use rocket::response::NamedFile;
use std::path::{PathBuf, Path};
use rocket::request::Form;
use rocket::http::RawStr;
use regex::Regex;
use chrono::{NaiveDate, Utc};
use chrono::Datelike;

#[derive(Serialize)]
struct ChartContext {
	account_name : String,
	groups : HashMap<String, f32>,
	total_sum : f32,
	total_chart : f32,
	date_start : String,
	date_end : String
}


#[get("/chart?<start>&<end>")]
pub fn chart_handler(start : Option<&RawStr>, end : Option<&RawStr>) -> rocket_contrib::templates::Template {
	let date_start = match start {
		Some(s) => { let mut tmp = s.to_string();
			tmp.push_str("-01");
			chrono::NaiveDate::parse_from_str(&tmp, "%Y-%m-%d").unwrap() },
		None => Utc::today().naive_utc()
	};
	let date_end = match end {
		Some(s) => { let mut tmp = s.to_string();
			tmp.push_str("-01");
			chrono::NaiveDate::parse_from_str(&tmp, "%Y-%m-%d").unwrap() },
		None => Utc::today().naive_utc() 
	};
	let date_range = crate::web_frontend::util::DateRange::new(date_start, date_end);	
	// read group config
	let chart_file = "data/giro";
	let chart_config = IniFile::from_file(chart_file);
	let ini_file;
	match chart_config {
		Ok(file) => ini_file = file,
		Err(e) => panic!("could not read group file {:?}", e)
	}
	let mut groups = HashMap::new();

	let asset_ini = "data/asset.ini";
	let asset = crate::banking::asset::Asset::from_ini_file(asset_ini);
	    let transactions = asset.get_account_by_name("Girokonto");
	    let acc;
	    match transactions {
		    Some(trans) => acc = trans,
		    None => panic!("could not read file")
	    }
	    let t = acc.transactions;
	// filter transaction to match only the specified timeframe
	println!("unfiltered number: {}", t.len());
	let mut t_filtered = Vec::new();
	for date in date_range {
		let mut tmp : Vec<_> = t.iter().filter(|x| x.date.month() == date.month()).collect();
		t_filtered.append(& mut tmp);

	}
	println!("filtered number: {}", t_filtered.len());
	let total_sum = t_filtered.iter().filter(|t| t.amount < 0.0 )
		.fold(0.0, |acc, x| acc + x.amount).abs();
	println!("total sum: {}", total_sum);
	let mut total_chart = 0.0;
	for (section_name, entries) in ini_file.sections {
		let mut complete = 0.0;
		for (key, values) in entries {
		    for val in values {
			let mut t_filtered_cloned = t_filtered.clone();
			if val.is_empty() || val.is_empty() {
				continue
			}
		    	let re = Regex::new(&val).unwrap();
		    	let tmp = t_filtered_cloned.into_iter().filter(|transaction|
				re.is_match(&transaction.sender_name) )
			    .fold(0.0, |acc, x| acc + x.amount);
		    	complete = complete + tmp.abs();
		    }
		}
		groups.insert(section_name, complete);
		total_chart = total_chart + complete;
		// ALSO INSERT OTHER, AKA THE REST
	}
	let context = ChartContext { account_name : String::from("Girokonto"),
		groups : groups, total_sum : total_sum, total_chart : total_chart,
		date_start : date_start.to_string()[0..7].to_string(),
		date_end : date_end.to_string()[0..7].to_string() };
	Template::render("chart", context)
}