import os
import random
random.seed(int(os.getenv("SEED"), 16))
from utils import util
from utils.db import Database


def gen_sites():
    db = Database(util.get_db_root())
    grid = db.grid()
    for tile_name in sorted(grid.tiles()):
        loc = grid.loc_of_tilename(tile_name)
        gridinfo = grid.gridinfo_at_loc(loc)
        if gridinfo.tile_type in ['CLEL_L', 'CLEL_R', 'CLEM_L', 'CLEM_R']:
            site_name = sorted(gridinfo.sites.keys())[0]
            yield tile_name, site_name


def write_params(params):
    pinstr = 'tile,val,site\n'
    for tile, (site, val) in sorted(params.items()):
        pinstr += '%s,%s,%s\n' % (tile, val, site)
    open('params.csv', 'w').write(pinstr)


def run():
    print(
        '''
module top(input clk, stb, di, output do);
    localparam integer DIN_N = 8;
    localparam integer DOUT_N = 8;

    reg [DIN_N-1:0] din;
    wire [DOUT_N-1:0] dout;

    reg [DIN_N-1:0] din_shr;
    reg [DOUT_N-1:0] dout_shr;

    always @(posedge clk) begin
        din_shr <= {din_shr, di};
        dout_shr <= {dout_shr, din_shr[DIN_N-1]};
        if (stb) begin
            din <= din_shr;
            dout_shr <= dout;
        end
    end

    assign do = dout_shr[DOUT_N-1];
    ''')

    params = {}

    sites = list(gen_sites())
    for (tile_name, site_name), isone in zip(sites,
                                             util.gen_fuzz_states(len(sites))):
        params[tile_name] = (site_name, isone)

        print(
            '''
            (* KEEP, DONT_TOUCH, LOC = "%s" *)
            CARRY8 carry8_%s (
                    .CI(%u));
''' % (site_name, site_name, isone))

    print("endmodule")
    write_params(params)


if __name__ == '__main__':
    run()