use std::{fs::File, io::{BufReader, Read, Seek, SeekFrom}};

use bincode::{de::read, Result};
use log::debug;
use serde::Deserialize;

use super::{deserialize, table_directory::{FontTable, TableDirectoryRecord}};

#[derive(Debug, Deserialize)]
pub struct MaximumProfileV05 {
	pub num_glyphs: u16
}

#[derive(Debug, Deserialize)]
pub struct MaximumProfileV10 {
	pub num_glyphs: u16,
	pub max_points: u16,
	pub max_countours: u16,
	pub max_composite_points: u16,
	pub max_composite_countours: u16,
	pub max_zones: u16,
	pub max_twilight_points: u16,
	pub max_storage: u16,
	pub max_function_defs: u16,
	pub max_instruction_defs: u16,
	pub max_stack_elements: u16,
	pub max_size_of_instructions: u16,
	pub max_component_elements: u16,
	pub max_component_depth: u16
}

#[derive(Debug)]
pub enum MaximumProfile {
	V0_5(MaximumProfileV05),
	V1_0(MaximumProfileV10)
}

impl MaximumProfile {
	pub fn num_glyphs(&self) -> u16 {
		match self {
			Self::V0_5(profile) => profile.num_glyphs,
			Self::V1_0(profile) => profile.num_glyphs
		}
	}
}

impl FontTable for MaximumProfile {
	const TAG: &'static str = "maxp";
	type InitData = ();

	fn decode(mut reader: BufReader<File>, _: &TableDirectoryRecord, _: Option<Self::InitData>) -> Result<Self>
		where Self: Sized
	{
		let version: u32 = deserialize(reader.by_ref())?;
		debug!("maxp table version: {:#08x}", version);

		match version {
			0x00005000 => todo!(),
			0x00010000 => Ok(MaximumProfile::V1_0(deserialize(reader.by_ref())?)),
			_ => { return Err(bincode::ErrorKind::Custom("Invalid maxp table version".into()).into()); }
		}
	}
	
}