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use arrayvec::ArrayString;

use crate::constants::{MAX_INF_LEN, MAX_MIN_LEN, MAX_NAN_LEN};
use crate::format::utils::{InfinityStr, MinusSignStr, NanStr};
use crate::format::{CustomFormatBuilder, Format, Grouping};

/// Type for representing your own custom formats.
///
/// # Example
/// ```
/// use num_format::errors::Error;
/// use num_format::format::{CustomFormat, Grouping};
/// use num_format::Buffer;
///
/// fn main() -> Result<(), Error> {
///     let format = CustomFormat::builder()
///         .grouping(Grouping::Indian)
///         .minus_sign("--")
///         .separator(Some('.'))
///         .build()?;
///
///     let mut buf = Buffer::new();
///     buf.write_formatted(&(-1000000), &format);
///     assert_eq!("--10.00.000", buf.as_str());
///
///     Ok(())
/// }
#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
#[cfg_attr(feature = "with-serde", derive(Serialize, Deserialize))]
pub struct CustomFormat {
    pub(crate) dec: char,
    pub(crate) grp: Grouping,
    pub(crate) inf: ArrayString<[u8; MAX_INF_LEN]>,
    pub(crate) min: ArrayString<[u8; MAX_MIN_LEN]>,
    pub(crate) nan: ArrayString<[u8; MAX_NAN_LEN]>,
    pub(crate) sep: Option<char>,
}

impl CustomFormat {
    /// Constructs a [`CustomFormatBuilder`].
    ///
    /// [`CustomFormatBuilder`]: struct.CustomFormatBuilder.html
    pub fn builder() -> CustomFormatBuilder {
        CustomFormatBuilder::new()
    }

    /// Turns `self` into a [`CustomFormatBuilder`].
    ///
    /// [`CustomFormatBuilder`]: struct.CustomFormatBuilder.html
    pub fn into_builder(self) -> CustomFormatBuilder {
        self.into()
    }

    /// Returns this format's representation of decimal points.
    pub fn decimal(&self) -> char {
        self.dec
    }

    /// Returns this format's [`Grouping`], which governs how digits are separated (see [`Grouping`]).
    ///
    /// [`Grouping`]: enum.Grouping.html
    pub fn grouping(&self) -> Grouping {
        self.grp
    }

    /// Returns this format's representation of infinity.
    pub fn infinity(&self) -> &str {
        &self.inf
    }

    /// Returns this format's representation of minus signs.
    pub fn minus_sign(&self) -> &str {
        &self.min
    }

    /// Returns this format's representation of NaN.
    pub fn nan(&self) -> &str {
        &self.nan
    }

    /// Returns this format's representation of separators.
    pub fn separator(&self) -> Option<char> {
        self.sep
    }
}

impl Format for CustomFormat {
    fn decimal(&self) -> char {
        self.decimal()
    }

    fn grouping(&self) -> Grouping {
        self.grouping()
    }

    fn infinity(&self) -> InfinityStr<'_> {
        InfinityStr::new(self.infinity()).unwrap()
    }

    fn minus_sign(&self) -> MinusSignStr<'_> {
        MinusSignStr::new(self.minus_sign()).unwrap()
    }

    fn nan(&self) -> NanStr<'_> {
        NanStr::new(self.nan()).unwrap()
    }

    fn separator(&self) -> Option<char> {
        self.separator()
    }
}