use chrono::{NaiveDate, Utc};
use chrono::Datelike;

#[derive(Debug)]
pub struct DateRange {
	start_year : i32,
	start_month : u32,
	end_year : i32,
	end_month : u32,
}

impl DateRange {
	pub fn new(start : chrono::NaiveDate, end : chrono::NaiveDate) -> DateRange {
		DateRange {
			start_year : start.year(),
			start_month : start.month(),
			end_year : end.year(),
			end_month : end.month(),
		}
	}
}

impl Iterator for DateRange {
	type Item = chrono::NaiveDate;

	fn next(&mut self) -> Option<Self::Item> {
		println!("next called");
		if (self.start_year <= self.end_year) {
			if(self.start_month <= self.end_month) {
				let mut tmp = self.start_year.to_string();
				if self.start_month < 10 {
					tmp.push_str("-0");
				} else {
					tmp.push_str("-");
				}
				tmp.push_str(&self.start_month.to_string());
				tmp.push_str("-01");
				if self.start_month < 13 {
					self.start_month = self.start_month + 1;
				} else {
					self.start_month = 1;
					self.start_year = self.start_year + 1;
				}
				println!("{}", tmp);
				return Some(chrono::NaiveDate::parse_from_str(&tmp, "%Y-%m-%d").unwrap())
			}
		}
		None
	}
}