#!/usr/bin/env python3

import sys
import os
import math
import argparse

sGBDK = """//AUTOGENERATED FILE FROM {:s}
#include <stdint.h>
#include <gbdk/platform.h>
#include "{:s}.h"
BANKREF({:s})
const {:s} {:s}[{:s}_SIZE] = {{
{:s}}};
"""

hGBDK = """//AUTOGENERATED FILE FROM {:s}
#ifndef GEN_CONST_ANGLES_{:s}_H
#define GEN_CONST_ANGLES_{:s}_H
#include <stdint.h>
#include <gbdk/platform.h>

#define {:s}_WIDTH {:d}
#define {:s}_SIZE {:d}
extern const {:s} {:s}[{:s}_SIZE];

BANKREF_EXTERN({:s})
#endif
"""

def calc(args):
    s = ""

    for i in range(0, args.steps):
        angle = 360 / args.steps * i
        sin_a = math.sin(math.radians(angle)) * args.max
        cos_a = math.cos(math.radians(angle)) * args.max

        for n in range(0, args.shift):
            sin_a *= 2
            cos_a *= 2

        if args.width > 0:
            s += f"    {round(sin_a)},"

        if args.width > 1:
            s += f" {round(cos_a)},"

        s += f" // {angle}\n"

    return (s, args.steps * args.width)

def main(args):
    outheader = os.path.join(args.dir, f"{args.name}.h")
    outsource = os.path.join(args.dir, f"{args.name}.c")

    data, length = calc(args)

    source = sGBDK.format(sys.argv[0],
                          args.name, args.name,
                          args.type,
                          args.name, args.name,
                          data)

    if args.verbose:
        print(f"Source: {outsource}")
        print(source)

    if not args.dry_run:
        with open(outsource, "w") as o:
            o.write(source)

    header = hGBDK.format(sys.argv[0],
                          args.name, args.name, args.name,
                          args.width,
                          args.name,
                          length, args.type,
                          args.name, args.name, args.name)

    if args.verbose:
        print(f"Header: {outheader}")
        print(header)

    if not args.dry_run:
        with open(outheader, "w") as o:
            o.write(header)

if __name__=='__main__':
    parser = argparse.ArgumentParser()
    parser.add_argument("-d", "--dir", default=os.path.realpath("."))
    parser.add_argument("-n", "--name", required=True) #default="angles")
    parser.add_argument("-s", "--steps", default=16, type=int)
    parser.add_argument("-w", "--width", default=2, type=int)
    parser.add_argument("-f", "--shift", default=0, type=int)
    parser.add_argument("-m", "--max", default=42, type=int)
    parser.add_argument("-t", "--type", default="int8_t")
    parser.add_argument("-v", "--verbose", action="store_true")
    parser.add_argument("-y", "--dry-run", action="store_true")
    args = parser.parse_args()
    #print(args)
    main(args)