#!/usr/bin/env python3
import json
import sys
tokens = dict()
program = './ast.json'
if len(sys.argv) > 1:
    program = sys.argv[1]
with open(program, 'r') as json_tokens:
  tokens = json.loads(json_tokens.read())

def throw(token: dict, message):
    print("{} on line {} ".format(message, token['line_number']))
    if token['variant'] == 'syntax_error':
        print("\033[4m" + token['value'] + "\033[0m")
    sys.exit(1)

def resolve_variabel(tokens, signifier):
    for token in tokens:
        if token['variant'] == "variable_declaration" and token['signifier'] == signifier:
            return token

def parse_expression(variable_list, expression, all_tokens):
    split_on_space = expression.split(" ")
    if len(split_on_space) == 1:
        for param in variable_list:
            if param['signifier'] == expression:
                if type(param['expression']) == type(dict()):
                    return param['expression']['expression']
                match param['type']:
                    case 'string':
                        return str(param['expression'])
                    case 'number':
                        resolved = list()
                        for part in param['expression'].split(' '):
                            if part.isalpha(): 
                                variable = resolve_variabel(all_tokens, part)
                                resolved.append(variable)
                            elif part == '+':
                                resolved.append({"variant": "operator", "type": "addition"})
                            elif part == '-':
                                resolved.append({"variant": "operator", "type": "subtraction"})
                            elif part == '*':
                                resolved.append({"variant": "operator", "type": "multiplication"})
                            elif part == '/':
                                resolved.append({"variant": "operator", "type": "division"})
                            elif part == '%':
                                resolved.append({"variant": "operator", "type": "modulo"})
                            elif float(part):
                                resolved.append({"expression": part})
                        if len(resolved) == 3:
                            lhs = resolved[0]['expression']
                            operator = resolved[1]
                            rhs = resolved[2]['expression']
                            match operator['type']:
                                case "addition":
                                    return str(float(lhs) + float(rhs))
                                case "subtraction":
                                    return str(float(lhs) - float(rhs))
                                case "multiplication":
                                    return str(float(lhs) * float(rhs))
                                case "division":
                                    return str(float(lhs) / float(rhs))
                                case "modulo":
                                    return str(float(lhs) % float(rhs))

    else:
        return "Unknown"


for token in tokens:
    match token['variant']:
        case "syntax_error":
            throw(token, "Syntax error")
        case "function_call":
            args = token['params']
            function = token['function']
            params = function['params']
            if len(args) != len(params):
                print(params)
                throw(token, "Wrong number of arguments")
            for index in range(0, len(args)):
                if args[index]['type'] != params[index]['type']:
                    throw(token, "Type missmatch on arguments")
                signifier = params[index]['name'] 
                params[index] = args[index]
                params[index]['signifier'] = signifier 
            for part in function['body']:
                if part['type'] == "stdout":
                    print(parse_expression(params, part['expression'], tokens),  end = '')
        case _:
            pass # print(token)