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use nom::{IResult as NomResult, le_u16 as parse_le_u16, le_u32 as parse_le_u32, le_u8 as parse_u8};
use swf_tree as ast;

pub fn sound_rate_from_id(sound_rate_id: u8) -> ast::SoundRate {
  match sound_rate_id {
    0 => ast::SoundRate::SoundRate5500,
    1 => ast::SoundRate::SoundRate11000,
    2 => ast::SoundRate::SoundRate22000,
    3 => ast::SoundRate::SoundRate44000,
    _ => panic!("Unexpected sound rate id"),
  }
}

pub fn audio_coding_format_from_id(audio_coding_format_id: u8) -> ast::AudioCodingFormat {
  match audio_coding_format_id {
    0 => ast::AudioCodingFormat::UncompressedNativeEndian,
    1 => ast::AudioCodingFormat::Adpcm,
    2 => ast::AudioCodingFormat::Mp3,
    3 => ast::AudioCodingFormat::UncompressedLittleEndian,
    4 => ast::AudioCodingFormat::Nellymoser16,
    5 => ast::AudioCodingFormat::Nellymoser8,
    6 => ast::AudioCodingFormat::Nellymoser,
    11 => ast::AudioCodingFormat::Speex,
    _ => panic!("Unexpected audio coding format id"),
  }
}

// TODO: Implement `Copy` on `AudioCodingFormat` and pass it by value
pub fn is_uncompressed_audio_coding_format(format: &ast::AudioCodingFormat) -> bool {
  match format {
    ast::AudioCodingFormat::UncompressedNativeEndian => true,
    ast::AudioCodingFormat::UncompressedLittleEndian => true,
    _ => false,
  }
}

pub fn parse_sound_info(input: &[u8]) -> NomResult<&[u8], ast::SoundInfo> {
  do_parse!(
    input,
    flags: parse_u8 >>
    has_in_point: value!((flags & (1 << 0)) != 0) >>
    has_out_point: value!((flags & (1 << 1)) != 0) >>
    has_loops: value!((flags & (1 << 2)) != 0) >>
    has_envelope: value!((flags & (1 << 3)) != 0) >>
    sync_no_multiple: value!((flags & (1 << 4)) != 0) >>
    sync_stop: value!((flags & (1 << 5)) != 0) >>
    // Bits [6, 7] are reserved
    in_point: cond!(has_in_point, parse_le_u32) >>
    out_point: cond!(has_out_point, parse_le_u32) >>
    loop_count: cond!(has_loops, parse_le_u16) >>
    envelope_records: cond!(has_envelope, length_count!(parse_u8, parse_sound_envelope)) >>
    (ast::SoundInfo {
      sync_stop,
      sync_no_multiple,
      in_point,
      out_point,
      loop_count,
      envelope_records,
    })
  )
}

pub fn parse_sound_envelope(input: &[u8]) -> NomResult<&[u8], ast::SoundEnvelope> {
  do_parse!(
    input,
    pos44: parse_le_u32 >>
    left_level: parse_le_u16 >>
    right_level: parse_le_u16 >>
    (ast::SoundEnvelope {
      pos44,
      left_level,
      right_level,
    })
  )
}