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use std::fmt;

use chrono_tz::Tz;

use crate::error::CliResult;
use crate::util::{csv_util, timestamp_util};

pub static DELIMITER_DEFAULT: &str = ",";
pub static TIMESTAMP_COL_DATE_DEFAULT: usize = 0;

pub type DateCol = usize;
pub type TimeCol = usize;

#[derive(Clone)]
pub enum TimestampCol {
    Timestamp(usize),
    DateAndTime(DateCol, TimeCol),
}

#[derive(Clone)]
pub struct TimestampConfig {
    timestamp_col: TimestampCol,
    timestamp_fmt: Option<String>,
    timezone: Tz,
}

impl TimestampConfig {
    pub fn new(timestamp_col: TimestampCol, timestamp_fmt: Option<String>, timezone: Tz) -> Self {
        TimestampConfig { timestamp_col, timestamp_fmt, timezone }
    }

    pub fn default() -> Self {
        let timestamp_col = TimestampCol::Timestamp(0);
        let timezone = timestamp_util::DEFAULT_ZONE;
        TimestampConfig { timestamp_col, timestamp_fmt: None, timezone }
    }

    pub fn timestamp_col(&mut self) -> &mut TimestampCol {
        &mut self.timestamp_col
    }

    pub fn timestamp_fmt(&mut self) -> &mut Option<String> {
        &mut self.timestamp_fmt
    }

    pub fn set_timestamp_fmt(&mut self, fmt: String) {
        self.timestamp_fmt = Some(fmt)
    }

    pub fn timezone(&self) -> Tz {
        self.timezone
    }
}

#[derive(Clone)]
pub struct CSVInputConfig {
    delimiter: u8,
    has_header: bool,
    timestamp_config: TimestampConfig,
}

#[derive(Clone)]
pub struct CSVOutputConfig {
    delimiter: String,
    print_timestamp: bool
}

impl CSVInputConfig {
    pub fn new(delimiter: &str,
               has_header: bool,
               timestamp_config: TimestampConfig) -> CliResult<Self>
    {
        let delimiter = csv_util::parse_into_delimiter(delimiter)?;
        Ok(CSVInputConfig { delimiter, has_header, timestamp_config })
    }

    pub fn new_default() -> CliResult<Self> {
        let delimiter = csv_util::parse_into_delimiter(DELIMITER_DEFAULT)?;
        let timestamp_config = TimestampConfig::default();
        Ok(CSVInputConfig { delimiter, has_header: false, timestamp_config })
    }

    pub fn has_header(&self) -> bool {
        self.has_header
    }

    pub fn delimiter(&self) -> u8 {
        self.delimiter
    }

    pub fn timestamp_config(&mut self) -> &mut TimestampConfig {
        &mut self.timestamp_config
    }
}

impl CSVOutputConfig {
    pub fn new(delimiter: &str, print_timestamp: bool) -> Self {
        CSVOutputConfig { delimiter: delimiter.to_string(), print_timestamp }
    }

    pub fn new_default() -> Self {
        CSVOutputConfig { delimiter: DELIMITER_DEFAULT.to_string(), print_timestamp: true }
    }

    pub fn delimiter(&self) -> &String {
        &self.delimiter
    }

    pub fn print_timestamp(&self) -> bool {
        self.print_timestamp
    }
}

impl fmt::Debug for CSVInputConfig {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "delimiter: {:?}, has headers: {:?}", self.delimiter, self.has_header)
    }
}