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// Take a look at the license at the top of the repository in the LICENSE file.

use std::{fmt, mem, ptr};

use glib::translate::*;

use crate::CoverageLevel;

#[cfg(feature = "v1_44")]
glib::wrapper! {
    /// A [`Coverage`][crate::Coverage] structure is a map from Unicode characters
    /// to [`CoverageLevel`][crate::CoverageLevel] values.
    ///
    /// It is often necessary in Pango to determine if a particular
    /// font can represent a particular character, and also how well
    /// it can represent that character. The [`Coverage`][crate::Coverage] is a data
    /// structure that is used to represent that information. It is an
    /// opaque structure with no public fields.
    #[doc(alias = "PangoCoverage")]
    pub struct Coverage(Object<ffi::PangoCoverage>);

    match fn {
        type_ => || ffi::pango_coverage_get_type(),
    }
}

// There was no get_type() function before 1.44
#[cfg(not(feature = "v1_44"))]
glib::wrapper! {
    #[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
    #[doc(alias = "PangoCoverage")]
    pub struct Coverage(Shared<ffi::PangoCoverage>);

    match fn {
        ref => |ptr| ffi::pango_coverage_ref(ptr),
        unref => |ptr| ffi::pango_coverage_unref(ptr),
    }
}

impl Coverage {
    /// Create a new [`Coverage`][crate::Coverage]
    ///
    /// # Returns
    ///
    /// the newly allocated [`Coverage`][crate::Coverage], initialized
    ///   to [`CoverageLevel::None`][crate::CoverageLevel::None] with a reference count of one, which
    ///   should be freed with `Pango::Coverage::unref()`.
    #[doc(alias = "pango_coverage_new")]
    pub fn new() -> Self {
        unsafe { from_glib_full(ffi::pango_coverage_new()) }
    }

    #[doc(alias = "pango_coverage_copy")]
    pub fn copy(&self) -> Option<Coverage> {
        unsafe { from_glib_full(ffi::pango_coverage_copy(self.to_glib_none().0)) }
    }

    /// Determine whether a particular index is covered by @self.
    /// ## `index_`
    /// the index to check
    ///
    /// # Returns
    ///
    /// the coverage level of @self for character @index_.
    #[doc(alias = "pango_coverage_get")]
    pub fn get(&self, index_: i32) -> CoverageLevel {
        unsafe { from_glib(ffi::pango_coverage_get(self.to_glib_none().0, index_)) }
    }

    /// Set the coverage for each index in @self to be the max (better)
    /// value of the current coverage for the index and the coverage for
    /// the corresponding index in @other.
    ///
    /// # Deprecated since 1.44
    ///
    /// This function does nothing
    /// ## `other`
    /// another [`Coverage`][crate::Coverage]
    #[cfg_attr(feature = "v1_44", deprecated)]
    #[doc(alias = "pango_coverage_max")]
    pub fn max(&self, other: &Coverage) {
        unsafe {
            ffi::pango_coverage_max(self.to_glib_none().0, other.to_glib_none().0);
        }
    }

    /// Modify a particular index within @self
    /// ## `index_`
    /// the index to modify
    /// ## `level`
    /// the new level for @index_
    #[doc(alias = "pango_coverage_set")]
    pub fn set(&self, index_: i32, level: CoverageLevel) {
        unsafe {
            ffi::pango_coverage_set(self.to_glib_none().0, index_, level.into_glib());
        }
    }

    /// Convert a [`Coverage`][crate::Coverage] structure into a flat binary format.
    ///
    /// # Deprecated since 1.44
    ///
    /// This returns [`None`]
    ///
    /// # Returns
    ///
    ///
    /// ## `bytes`
    ///
    ///   location to store result (must be freed with g_free())
    #[cfg_attr(feature = "v1_44", deprecated)]
    #[doc(alias = "pango_coverage_to_bytes")]
    pub fn to_bytes(&self) -> Vec<u8> {
        unsafe {
            let mut bytes = ptr::null_mut();
            let mut n_bytes = mem::MaybeUninit::uninit();
            ffi::pango_coverage_to_bytes(self.to_glib_none().0, &mut bytes, n_bytes.as_mut_ptr());
            FromGlibContainer::from_glib_full_num(bytes, n_bytes.assume_init() as usize)
        }
    }

    /// Convert data generated from [`to_bytes()`][Self::to_bytes()]
    /// back to a [`Coverage`][crate::Coverage].
    ///
    /// # Deprecated since 1.44
    ///
    /// This returns [`None`]
    /// ## `bytes`
    /// binary data
    ///   representing a [`Coverage`][crate::Coverage]
    ///
    /// # Returns
    ///
    /// a newly allocated [`Coverage`][crate::Coverage]
    #[cfg_attr(feature = "v1_44", deprecated)]
    #[doc(alias = "pango_coverage_from_bytes")]
    pub fn from_bytes(bytes: &[u8]) -> Option<Coverage> {
        let n_bytes = bytes.len() as i32;
        unsafe {
            from_glib_full(ffi::pango_coverage_from_bytes(
                bytes.to_glib_none().0,
                n_bytes,
            ))
        }
    }
}

impl Default for Coverage {
    fn default() -> Self {
        Self::new()
    }
}

impl fmt::Display for Coverage {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "Coverage")
    }
}