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use swf_tree as ast;
use nom::IResult;
use nom::{le_u8 as parse_u8};
use crate::parsers::basic_data_types::{parse_s_rgb8, parse_straight_s_rgba8};

#[allow(unused_variables)]
pub fn parse_color_stop(input: &[u8], with_alpha: bool) -> IResult<&[u8], ast::ColorStop> {
  do_parse!(
    input,
    ratio: parse_u8 >>
    color: switch!(value!(with_alpha),
      true => call!(parse_straight_s_rgba8) |
      false => map!(parse_s_rgb8, |c| ast::StraightSRgba8 {r: c.r, g: c.g, b: c.b, a: 255})
    ) >>
    (ast::ColorStop {
      ratio: ratio,
      color: color,
    })
  )
}

#[allow(unused_variables)]
pub fn parse_gradient(input: &[u8], with_alpha: bool) -> IResult<&[u8], ast::Gradient> {
  do_parse!(
    input,
    flags: parse_u8 >>
    spread_id: value!(flags >> 6) >>
    color_space_id: value!((flags & ((1 << 6) - 1)) >> 4) >>
    color_count: value!(flags & ((1 << 4) - 1)) >>
    spread: switch!(value!(spread_id),
      0 => value!(ast::GradientSpread::Pad) |
      1 => value!(ast::GradientSpread::Reflect) |
      2 => value!(ast::GradientSpread::Repeat)
      // TODO: Default to error
    ) >>
    color_space: switch!(value!(color_space_id),
      0 => value!(ast::ColorSpace::SRgb) |
      1 => value!(ast::ColorSpace::LinearRgb)
      // TODO: Default to error
    ) >>
    colors: length_count!(value!(color_count), apply!(parse_color_stop, with_alpha)) >>
    (ast::Gradient {
      spread: spread,
      color_space: color_space,
      colors: colors,
    })
  )
}

#[allow(unused_variables)]
pub fn parse_morph_color_stop(input: &[u8], with_alpha: bool) -> IResult<&[u8], ast::MorphColorStop> {
  do_parse!(
    input,
    start: apply!(parse_color_stop, with_alpha) >>
    end: apply!(parse_color_stop, with_alpha) >>
    (ast::MorphColorStop {
      ratio: start.ratio,
      color: start.color,
      morph_ratio: end.ratio,
      morph_color: end.color,
    })
  )
}

#[allow(unused_variables)]
pub fn parse_morph_gradient(input: &[u8], with_alpha: bool) -> IResult<&[u8], ast::MorphGradient> {
  do_parse!(
    input,
    flags: parse_u8 >>
    spread_id: value!(flags >> 6) >>
    color_space_id: value!((flags & ((1 << 6) - 1)) >> 4) >>
    color_count: value!(flags & ((1 << 4) - 1)) >>
    spread: switch!(value!(spread_id),
      0 => value!(ast::GradientSpread::Pad) |
      1 => value!(ast::GradientSpread::Reflect) |
      2 => value!(ast::GradientSpread::Repeat)
      // TODO: Default to error
    ) >>
    color_space: switch!(value!(color_space_id),
      0 => value!(ast::ColorSpace::SRgb) |
      1 => value!(ast::ColorSpace::LinearRgb)
      // TODO: Default to error
    ) >>
    colors: length_count!(value!(color_count), apply!(parse_morph_color_stop, with_alpha)) >>
    (ast::MorphGradient {
      spread: spread,
      color_space: color_space,
      colors: colors,
    })
  )
}