#include "codegen.h"

#include <groundvm.h>
#include "../parser/SolsNode.h"
#include "../include/estr.h"

// FIXME add proper erroring function
char* createCodegenError(char* what) {
    Estr estr = CREATE_ESTR(what);
    APPEND_ESTR(estr, "\nthats an error");
    return estr.str;
}

static inline ResultType(GroundProgram, charptr) generateLiteralNode(SolsNode* node) {
    // We don't even need to do anything lmao
    return Success(GroundProgram, charptr, groundCreateProgram());
}

static inline ResultType(GroundProgram, charptr) generatePutsNode(SolsNode* node) {
    if (node->children.count < 1) {
        return Error(GroundProgram, charptr, "puts requires arguments");
    }
    GroundInstruction inst = groundCreateInstruction(PRINTLN);
    for (size_t i = 0; i < node->children.count; i++) {
        groundAddReferenceToInstruction(&inst, node->children.at[i].accessArg);
    }
    GroundProgram program = groundCreateProgram();
    groundAddInstructionToProgram(&program, inst);
    return Success(GroundProgram, charptr, program);
}

ResultType(GroundProgram, charptr) generateCode(SolsNode* node) {

    GroundProgram program = groundCreateProgram();

    // Generate code for all children before generating this node's code
    for (size_t i = 0; i < node->children.count; i++) {
        ResultType(GroundProgram, charptr) generated = generateCode(&node->children.at[i]);
        if (generated.error) {
            return Error(GroundProgram, charptr, createCodegenError(generated.as.error));
        }
        for (size_t j = 0; j < generated.as.success.size; j++) {
            groundAddInstructionToProgram(&program, generated.as.success.instructions[j]);
        }
    }

    // Now generate code for this node
    switch (node->type) {
        case SNT_PUTS: generate(Puts);
        case SNT_LITERAL: generate(Literal);
    }
    return Success(GroundProgram, charptr, program);
}