import * as fs from 'fs'

import {Buf} from './buf'

class Font {
    header: UcsFontHeader
    // blocks:
}

class UcsFontHeader {
    magic: string    // char[16]
    size: number     // uint        Total font size
    blocks: number   // uint

    constructor() {
        this.magic = ''
        this.size = 0
        this.blocks = 0
    }

    read_from(buf: Buf) {
        this.magic = buf.read_counted_str(16)
        this.size = buf.read_u32_le()
        this.blocks = buf.read_u32_le()
    }
}

class UcsFontBlock {
    start: number       // ushort       Code start value
    end: number         // ushort       End code value
    width: number       // ushort       Lattice (grid) width
    height: number      // ushort       Lattice (grid) height
    roffs: number       // uint         Font dot matrix data offset
    xoffs: number       // uint         Font extension data offset

    constructor() {
        this.start = 0
        this.end = 0
        this.width = 0
        this.height = 0
        this.roffs = 0
        this.xoffs = 0
    }
    read_from(buf: Buf) {
        this.start = buf.read_u16_le()
        this.end = buf.read_u16_le()
        this.width = buf.read_u16_le()
        this.height = buf.read_u16_le()
        this.roffs = buf.read_u32_le()
        this.xoffs = buf.read_u32_le()
    }
}

function read_font(path: string) {
    let buf = new Buf()
    buf.data = fs.readFileSync(path)

    console.log('file: ', path)
    console.log('file size: ', buf.data.length)

    let header = new UcsFontHeader()
    header.read_from(buf)
    console.log('header: ', header)

    let blocks = []

    for(let block_index = 0; block_index < header.blocks; block_index++) {
        let block = new UcsFontBlock()
        block.read_from(buf)
        console.log('block: ', block)
        blocks.push(block)

        const bytes_per_symbol = block.width*block.height
        console.log('bytes_per_symbol: ', bytes_per_symbol)
        const symbols_per_block = (block.xoffs - block.roffs) / bytes_per_symbol
        console.log('symbols_per_block: ', symbols_per_block)

        let pos = block.roffs;
        for(let symbol_index = 0; symbol_index < symbols_per_block; symbol_index++) {
            let symbol_data = buf.read_from_offset(pos, bytes_per_symbol)
            let start_pos = pos;
            pos += bytes_per_symbol
            console.log('symbol ', symbol_index, '    start_pos: ', start_pos, '    end_pos: ', pos)
            for(let h = 0; h < block.height; h++) {
                let str = ''
                for(let w = 0; w < block.width; w++) {
                    str += symbol_data[h*block.width + w] + ' '
                }
                // console.log(str);
            }
        }
    }


    // console.log('buf.offset: ', buf.offset)
    // console.log('buf len - offset: ', buf.data.length - buf.offset);
    // let font_bytes = (block.width + 7)  / 8 * block.height;
    // console.log('font_bytes: ', font_bytes);


    // console.log('bytes_per_symbol: ', block.width*block.height);
    // console.log('bytes_128_symbol: ', 128*block.width*block.height);

    // let m_pASCIIFont = new Uint8Array(font_bytes * 128 + 128);
    for(let block_index = 0; block_index < header.blocks; block_index++) {
    }

}

read_font('./Font.bin')