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use super::*;
use polars_arrow::export::arrow::array::{MutableArray, MutableUtf8Array, Utf8Array};
use polars_arrow::export::arrow::temporal_conversions::{
    date32_to_date, MILLISECONDS, SECONDS_IN_DAY,
};
use std::fmt::Write;

pub(crate) fn naive_date_to_date(nd: NaiveDate) -> i32 {
    let nt = NaiveTime::from_hms(0, 0, 0);
    let ndt = NaiveDateTime::new(nd, nt);
    naive_datetime_to_date(ndt)
}

pub(crate) fn naive_datetime_to_date(v: NaiveDateTime) -> i32 {
    (datetime_to_timestamp_ms(v) / (MILLISECONDS * SECONDS_IN_DAY)) as i32
}

pub trait DateMethods {
    /// Extract month from underlying NaiveDate representation.
    /// Returns the year number in the calendar date.
    fn year(&self) -> Int32Chunked;

    /// Extract month from underlying NaiveDateTime representation.
    /// Returns the month number starting from 1.
    ///
    /// The return value ranges from 1 to 12.
    fn month(&self) -> UInt32Chunked;

    /// Extract weekday from underlying NaiveDate representation.
    /// Returns the weekday number where monday = 0 and sunday = 6
    fn weekday(&self) -> UInt32Chunked;

    /// Returns the ISO week number starting from 1.
    /// The return value ranges from 1 to 53. (The last week of year differs by years.)
    fn week(&self) -> UInt32Chunked;

    /// Extract day from underlying NaiveDate representation.
    /// Returns the day of month starting from 1.
    ///
    /// The return value ranges from 1 to 31. (The last day of month differs by months.)
    fn day(&self) -> UInt32Chunked;

    /// Returns the day of year starting from 1.
    ///
    /// The return value ranges from 1 to 366. (The last day of year differs by years.)
    fn ordinal(&self) -> UInt32Chunked;

    /// Format Date with a `fmt` rule. See [chrono strftime/strptime](https://docs.rs/chrono/0.4.19/chrono/format/strftime/index.html).
    fn strftime(&self, fmt: &str) -> Utf8Chunked;

    fn parse_from_str_slice(name: &str, v: &[&str], fmt: &str) -> DateChunked;
}

impl DateMethods for DateChunked {
    /// Extract month from underlying NaiveDate representation.
    /// Returns the year number in the calendar date.
    fn year(&self) -> Int32Chunked {
        self.apply_kernel_cast::<Int32Type>(&date_to_year)
    }

    /// Extract month from underlying NaiveDateTime representation.
    /// Returns the month number starting from 1.
    ///
    /// The return value ranges from 1 to 12.
    fn month(&self) -> UInt32Chunked {
        self.apply_kernel_cast::<UInt32Type>(&date_to_month)
    }

    /// Extract weekday from underlying NaiveDate representation.
    /// Returns the weekday number where monday = 0 and sunday = 6
    fn weekday(&self) -> UInt32Chunked {
        self.apply_kernel_cast::<UInt32Type>(&date_to_weekday)
    }

    /// Returns the ISO week number starting from 1.
    /// The return value ranges from 1 to 53. (The last week of year differs by years.)
    fn week(&self) -> UInt32Chunked {
        self.apply_kernel_cast::<UInt32Type>(&date_to_week)
    }

    /// Extract day from underlying NaiveDate representation.
    /// Returns the day of month starting from 1.
    ///
    /// The return value ranges from 1 to 31. (The last day of month differs by months.)
    fn day(&self) -> UInt32Chunked {
        self.apply_kernel_cast::<UInt32Type>(&date_to_day)
    }

    /// Returns the day of year starting from 1.
    ///
    /// The return value ranges from 1 to 366. (The last day of year differs by years.)
    fn ordinal(&self) -> UInt32Chunked {
        self.apply_kernel_cast::<UInt32Type>(&date_to_ordinal)
    }

    /// Format Date with a `fmt` rule. See [chrono strftime/strptime](https://docs.rs/chrono/0.4.19/chrono/format/strftime/index.html).
    fn strftime(&self, fmt: &str) -> Utf8Chunked {
        let date = NaiveDate::from_ymd(2001, 1, 1);
        let fmted = format!("{}", date.format(fmt));

        let mut ca: Utf8Chunked = self.apply_kernel_cast(&|arr| {
            let mut buf = String::new();
            let mut mutarr =
                MutableUtf8Array::with_capacities(arr.len(), arr.len() * fmted.len() + 1);

            for opt in arr.into_iter() {
                match opt {
                    None => mutarr.push_null(),
                    Some(v) => {
                        buf.clear();
                        let datefmt = date32_to_date(*v).format(fmt);
                        write!(buf, "{}", datefmt).unwrap();
                        mutarr.push(Some(&buf))
                    }
                }
            }

            let arr: Utf8Array<i64> = mutarr.into();
            Arc::new(arr)
        });
        ca.rename(self.name());
        ca
    }

    fn parse_from_str_slice(name: &str, v: &[&str], fmt: &str) -> DateChunked {
        Int32Chunked::from_iter_options(
            name,
            v.iter().map(|s| {
                NaiveDate::parse_from_str(s, fmt)
                    .ok()
                    .as_ref()
                    .map(|v| naive_date_to_date(*v))
            }),
        )
        .into()
    }
}