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use std::{fmt, str};

use crate::format::FourCC;
use crate::v4l_sys::*;

bitflags::bitflags! {
    #[derive(PartialEq, Eq, Hash, Debug, Clone, Copy)]
    pub struct Flags : u32 {
        const COMPRESSED            = 0x0001;
        const EMULATED              = 0x0002;
        const CONTINUOUS_BITSTREAM  = 0x0004;
        const DYN_RESOLUTION        = 0x0008;
    }
}

impl From<u32> for Flags {
    fn from(flags: u32) -> Self {
        Self::from_bits_retain(flags)
    }
}

impl From<Flags> for u32 {
    fn from(flags: Flags) -> Self {
        flags.bits()
    }
}

impl fmt::Display for Flags {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        fmt::Debug::fmt(self, f)
    }
}

#[derive(Debug)]
/// Format description as returned by [`crate::v4l2::vidioc::VIDIOC_ENUM_FMT`]
pub struct Description {
    pub index: u32,
    pub typ: u32,
    pub flags: Flags,
    pub description: String,
    pub fourcc: FourCC,
}

impl fmt::Display for Description {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        writeln!(f, "index       : {}", self.index)?;
        writeln!(f, "type:       : {}", self.typ)?;
        writeln!(f, "flags:      : {}", self.flags)?;
        writeln!(f, "description : {}", self.description)?;
        writeln!(f, "fourcc      : {}", self.fourcc)?;
        Ok(())
    }
}

impl From<v4l2_fmtdesc> for Description {
    fn from(desc: v4l2_fmtdesc) -> Self {
        Self {
            index: desc.index,
            typ: desc.type_,
            flags: Flags::from(desc.flags),
            description: str::from_utf8(&desc.description)
                .unwrap()
                .trim_matches(char::from(0))
                .to_string(),
            fourcc: FourCC::from(desc.pixelformat),
        }
    }
}