import io:*
import grammer:*
import parser:*
import lexer:*
import ast_transformation:*
import string:*
import util:*
import symbol:*
import tree:*
import serialize:*

fun main():int {
    
    var gram.construct(): grammer

    var file_name = string("../krakenGrammer.kgm")

    var compiled_name = file_name + string(".comp_new")
    var file_contents = read_file(file_name)
    var loaded_and_valid = false

    if (file_exists(compiled_name)) {
        println("cached file exists")
        var pos = 0
        var binary = read_file_binary(compiled_name)
        println("read file!")
        var cached_contents = string()
        unpack(cached_contents, pos) = unserialize<string>(binary, pos)
        if (cached_contents == file_contents) {
            println("loaded_and_valid, using cached version!")
            loaded_and_valid = true
            unpack(gram, pos) = unserialize<grammer>(binary, pos)
            println("finished unserializeing!!")
        } else {
            println("file contents do not match:")
            println("CACHED:")
            println(cached_contents)
            println("REAL:")
            println(file_contents)
            println("END")
        }
    } else {
        println("cached file does not exist")
    }
    if (!loaded_and_valid) {
        println("Not loaded_and_valid, re-generating and writing out")
        gram = load_grammer(file_contents)
        println("grammer loaded, calculate_first_set")
        gram.calculate_first_set()
        println("grammer loaded, calculate_state_automaton")
        gram.calculate_state_automaton()
        println("calculated, writing out")
        write_file_binary(compiled_name, serialize(file_contents) + serialize(gram))
        println("done writing")
    }
    println(gram.to_string())

    var parse.construct(gram): parser
    var parse_tree = parse.parse_input(read_file(string("to_parse.krak")), string("fun name"))
    println("the tree")
    println(syntax_tree_to_dot(parse_tree))
    write_file(string("syntax_tree.dot"), syntax_tree_to_dot(parse_tree))

    var ast_pass.construct(): ast_transformation
    var ast = ast_pass.transform(parse_tree)
    println("the AST")
    println(ast_to_dot(ast))
    write_file(string("ast.dot"), ast_to_dot(ast))

    return 0
}