app.py

import numpy as np
from copy import deepcopy
from math import *
from collections import *
import sys
import streamlit as st
import time


def main():
    st.set_page_config(page_title="Wood Cutting Algorithm")
    start_time = time.time()
    lst = []
    n = st.number_input(
        "Enter number of different types of wood sizes: ", min_value=1, step=1
    )
    for i in range(0, n):
        ele = [
            st.number_input(
                "Enter number " + str(i) + " wood size: ", min_value=1, step=1
            ),
            st.number_input(
                "Enter number " + str(i) + " quantity: ", min_value=1, step=1
            ),
        ]
        lst.append(ele)
    cuts_dict = dict(lst)
    cuts = list(cuts_dict.keys())

    def getDesired(des_dict, Bo="No"):
        if Bo == "No":
            return des_dict
        exis = st.selectbox("Is there existing inventory?", ["Yes", "No"])
        if exis == "Yes":
            for i in des_dict.keys():
                val = st.number_input(
                    "How many boards of %d size are in existing inventory: " % i,
                    min_value=0,
                    step=1,
                )
                des_dict[i] = (des_dict[i] - val) if des_dict[i] >= val else 0
        st.write(des_dict)
        return des_dict

    def getMin(des, prov):
        minQua = sum([(k * v) for k, v in des.items()]) / prov
        return dict(minQua)

    def expansion(des):
        cutlist = []
        for k, v in des.items():
            cutlist += [k] * v
        return cutlist

    def simplify(des, prov):
        for i in des.keys():
            val = prov // i
            des[i] = val if val <= des[i] else des[i]
        return des

    def optimization(sols, des, prov):
        des_keys = list(des.keys())
        min_c = []
        for i in range(len(prov)):
            min_c += [prov[i]] * len(sols[i])
        c = np.array(min_c)
        A = [[] for i in range(len(des))]
        for i in range(len(sols)):
            for j in range(len(sols[0])):
                for k in range(len(des)):
                    A[k].append(sols[i][j][des_keys[k]])
        B = [((-1) * des[k]) for k in des.keys()]
        print(B)
        pass

    def modulize(des, prov1, prov2, res, res_complete):
        if len(des.keys()) == 0:
            return res_complete
        if min(des.keys()) > prov2:
            return res_complete
        des2 = deepcopy(des)
        for i in des.keys():
            des2.pop(i)
            if prov2 % i == 0:
                cnt = prov2 // i
                if cnt > des[i]:
                    continue
                res += [i] * cnt
                if sum(res) == prov1:
                    res_complete.append(res)
                res = []
            if prov2 >= i:
                cnt = prov2 // i
                if cnt > des[i]:
                    cnt = des[i]
                for coun in range(1, cnt + 1):
                    remain = prov2 - (coun * i)
                    res_min = [i] * coun
                    res_complete = modulize(
                        des2, prov1, remain, res + res_min, res_complete
                    )
        return res_complete

    def generate_cut_list(cut_dict):
        cut_list = []
        for key, value in cut_dict.items():
            for i in range(value):
                cut_list.append(int(key))
        return cut_list

    def wood_cutting(cut_list, sheet_size, max_sheets):
        sheets = 0
        rem_sheets = [0] * max_sheets
        cuts_per_sheet = []

        # loops through all cuts
        for i in range(len(cut_list)):
            j = 0

            # Algorithm to find the best sheet to assign the cut
            min_waste = sheet_size + 1
            best_index = 0
            for j in range(sheets):
                if (
                    rem_sheets[j] >= cut_list[i]
                    and rem_sheets[j] - cut_list[i] < min_waste
                ):
                    best_index = j
                    min_waste = rem_sheets[j] - cut_list[i]

            # If no sheet can accommodate the cut, then we create new sheet
            if min_waste == sheet_size + 1:
                rem_sheets[sheets] = sheet_size - cut_list[i]
                cuts_per_sheet.append([cut_list[i]])
                sheets += 1
            # Assign the cut to best sheet
            else:
                rem_sheets[best_index] -= cut_list[i]
                cuts_per_sheet[best_index].append(cut_list[i])

        return (sheets, cuts_per_sheet, rem_sheets[:sheets])

    def print_patterns(final, fid):
        fin = []
        for i in final:
            fin.append(dict(Counter(i)))
            print(dict(Counter(i)), file=fid)
        return fin

    def usable(waste):
        if 0 in list(waste.keys()):
            waste.pop(0)
        usable_w = dict()
        unusable_w = dict()
        for k in waste.keys():
            if k >= min(cuts):
                usable_w[k] = waste[k]
            else:
                unusable_w[k] = waste[k]
        return [usable_w, unusable_w]

    def outPrint(final):
        for i in final:
            print(Counter(i))
        return

    def outComp(final1, final2):
        for i in final1:
            if i not in final2:
                print(i)
        for x in final2:
            if x not in final1:
                print(x)
        return

    def dictComp(dict1, dict2):
        for key in list(dict1.keys()):
            try:
                if dict1[key] < dict2.get(key, 0):
                    return -1
            except:
                return -1
        return 1

    def dictSub(dict1, dict2):
        dict3 = {key: dict1[key] - dict2.get(key, 0) for key in dict1.keys()}
        return dict3

    def mod_key(key, res):
        key_c = []
        for dict_res in res:
            if key in dict_res.keys():
                key_c.append(dict_res)
        return key_c

    def list_to_dict(final, target):
        fin = []
        for i in final:
            if sum(i) == target:
                if dict(Counter(i)) not in fin:
                    fin.append(dict(Counter(i)))
        return fin

    des = getDesired(cuts_dict, "Yes")
    prov = st.number_input("Enter sheet size (in cm): ", min_value=1, step=1)
    sols = []
    des = simplify(des, prov)
    sols.append(modulize(des, prov, prov, [], []))
    sols = [x for x in sols if x]
    sols = [expansion(des) + x for x in sols]
    waste = []
    for i in sols:
        waste.append(prov - sum(i))
    min_waste = min(waste)
    sols_waste = [sols[x] for x in range(len(waste)) if waste[x] == min_waste]
    final = []
    for sol in sols_waste:
        sheets, cuts_per_sheet, waste_per_sheet = wood_cutting(
            generate_cut_list(cuts_dict), prov, len(sol)
        )
        if not waste_per_sheet:
            final.append(sol)
        else:
            for i in range(len(sol)):
                if waste_per_sheet[i] == 0:
                    continue
                else:
                    temp_sol = deepcopy(sol)
                    temp_sol.remove(sol[i])
                    temp_sol += [waste_per_sheet[i]]
                    temp_sol = sorted(temp_sol)
                    if temp_sol not in final:
                        final.append(temp_sol)
    st.write("Output:")
    out = print_patterns(final, sys.stdout)
    st.write(out)


if __name__ == "__main__":
    main()