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use std::fmt;

use crate::timestamp::Timestamp;

/// Buffer type
///
/// Specific types of devices require buffers of corresponding types.
#[allow(clippy::unreadable_literal)]
#[rustfmt::skip]
#[repr(u32)]
#[derive(Debug, Clone, Copy)]
pub enum Type {
    VideoCapture        = 1,
    VideoOutput         = 2,
    VideoOverlay        = 3,
    VbiCapture          = 4,
    VbiOutput           = 5,
    SlicedVbiCapture    = 6,
    SlicedVbiOutput     = 7,
    VideoOutputOverlay  = 8,
    VideoCaptureMplane  = 9,
    VideoOutputMplane   = 10,
    SdrCapture          = 11,
    SdrOutput           = 12,
    MetaCapture         = 13,
    MetaOutput          = 14,

    /// Deprecated, do not use
    Private             = 0x80,
}

bitflags::bitflags! {
    #[derive(PartialEq, Eq, Hash, Debug, Clone, Copy)]
    pub struct Flags: u32 {
        /// Buffer is mapped
        const MAPPED                = 0x00000001;
        /// Buffer is queued for processing
        const QUEUED                = 0x00000002;
        /// Buffer is ready
        const DONE                  = 0x00000004;
        /// Image is a keyframe (I-frame)
        const KEYFRAME              = 0x00000008;
        /// Image is a P-frame
        const PFRAME                = 0x00000010;
        /// Image is a B-frame
        const BFRAME                = 0x00000020;
        /// Buffer is ready, but the data contained within is corrupted
        const ERROR                 = 0x00000040;
        /// Buffer is added to an unqueued request
        const IN_REQUEST            = 0x00000080;
        /// Timecode field is valid
        const TIMECODE              = 0x00000100;
        /// Don't return the capture buffer until OUTPUT timestamp changes
        const M2M_HOLD_CAPTURE_BUF  = 0x00000200;
        /// Buffer is prepared for queuing
        const PREPARED              = 0x00000400;
        /// Cache handling flags
        const NO_CACHE_INVALIDATE   = 0x00000800;
        const NO_CACHE_CLEAN        = 0x00001000;
        /// Timestamp type
        const TIMESTAMP_MASK        = 0x0000e000;
        const TIMESTAMP_UNKNOWN     = 0x00000000;
        const TIMESTAMP_MONOTONIC   = 0x00002000;
        const TIMESTAMP_COPY        = 0x00004000;
        /// Timestamp sources
        const TSTAMP_SRC_MASK       = 0x00070000;
        const TSTAMP_SRC_EOF        = 0x00000000;
        const TSTAMP_SRC_SOE        = 0x00010000;
        /// mem2mem encoder/decoder
        const LAST                  = 0x00100000;
        /// request_fd is valid
        const REQUEST_FD            = 0x00800000;
    }
}

impl Default for Flags {
    fn default() -> Self {
        Flags::from(0)
    }
}

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)
    }
}

/// Buffer metadata, mostly used not to convolute the main buffer structs
#[derive(Copy, Clone, Default, Debug)]
pub struct Metadata {
    /// Number of bytes occupied by the data in the buffer
    pub bytesused: u32,
    /// Buffer flags
    pub flags: Flags,
    /// Indicates the field order of the image in the buffer.
    pub field: u32,
    /// Time of capture (usually set by the driver)
    pub timestamp: Timestamp,
    /// Sequence number, counting the frames
    pub sequence: u32,
}