import io:*
import mem:*
import map:*
import string:*
import util:*
import tree:*
import symbol:*
import ast_nodes:*


obj c_generator (Object) {
    fun construct(): *c_generator {
        return this
    }
    fun copy_construct(old: *c_generator) {
    }
    fun operator=(other: ref c_generator) {
        destruct()
        copy_construct(&other)
    }
    fun destruct() {
    }
    fun generate_c(name_ast_map: map<string, pair<*tree<symbol>,*ast_node>>): pair<string,string> {
        var linker_string:string = ""
        var prequal: string = "#include <stdbool.h>\n#include <stdlib.h>\n#include <stdio.h>\n"
        var plain_typedefs: string = ""
        var top_level_c_passthrough: string = ""
        var variable_extern_declarations: string = ""
        var structs: string = ""
        var function_typedef_string_pre: string = ""
        var function_typedef_string: string = ""
        var function_prototypes: string = ""
        var variable_declarations: string = ""


        // poset generation into structs string
        // iterate through asts
        name_ast_map.for_each(fun(name: string, tree_pair: pair<*tree<symbol>,*ast_node>) {
            // iterate through children for each ast
            // assert translation_unit?
            tree_pair.second->translation_unit.children.for_each(fun(child: *ast_node) {
                match (*child) {
                    // should really check the genrator
                    ast_node::if_comp(backing) {
                        if (is_simple_passthrough(backing.statement->statement.child))
                            top_level_c_passthrough += generate_simple_passthrough(backing.statement->statement.child)
                    }
                    ast_node::simple_passthrough(backing) top_level_c_passthrough += generate_simple_passthrough(child)
                }
            })
        })

        var function_definitions: string = ""
        return make_pair(prequal+plain_typedefs+top_level_c_passthrough+variable_extern_declarations+structs+function_typedef_string_pre+function_typedef_string+function_prototypes+variable_declarations+function_definitions, linker_string)
    }
    fun generate_simple_passthrough(node: *ast_node): string {
        // deal with all the passthrough params
        return node->simple_passthrough.passthrough_str
    }
    // for now, anyway
    fun generate(node: *ast_node): string {
        match (*node) {
            ast_node::simple_passthrough(backing) return generate_simple_passthrough(node)
        }
    }
}