#include "../../include/ground.h"
#include <stdio.h>
#include <inttypes.h>

/*
 * Return values guide:
 * -2: Exit program
 * -1: Nothing
 * 0-infinity: Jump to instruction number
 */

int64_t _GroundInstructionExecute(GroundInstruction* instruction, GroundValue* heap) {

    static const void* jumpTable[] = {
        &&IF, &&JUMP, &&END, 
        &&INPUT, &&PRINT, &&PRINTLN, 
        &&SET, &&GETTYPE, &&EXISTS, 
        &&SETLIST, &&SETLISTAT, &&GETLISTAT, &&GETLISTSIZE, &&LISTAPPEND,
        &&GETSTRSIZE, &&GETSTRCHARAT, 
        &&ADD, &&SUBTRACT, &&MULTIPLY, &&DIVIDE, 
        &&EQUAL, &&INEQUAL, &&NOT, &&GREATER, &&LESSER, 
        &&AND, &&OR, &&XOR, &&NEG, &&SHIFT, 
        &&STOI, &&STOD, &&ITOC, &&CTOI, &&TOSTRING, 
        &&FUN, &&RETURN, &&ENDFUN, &&CALL, &&CALLMETHOD, 
        &&STRUCT, &&ENDSTRUCT, &&INIT, &&GETFIELD, &&SETFIELD, 
        &&USE, &&EXTERN, &&CREATELABEL, 
        &&PAUSE, &&DROP, &&LICENSE, &&ERRORCMD, &&THROW, &&CATCH
    };

    // Preprocess any ValueRefs
    for (size_t i = 0; i < instruction->args.len; i++) {
        if (instruction->args.at[i].type == GroundArg_ValueRef) {
            size_t offset = instruction->args.at[i]._offset;
            instruction->args.at[i] = Ground.New.Arg.Value(heap[offset]);
        }
    }

    // Jump to the spot
    goto *jumpTable[instruction->type];

    IF: {
        if (instruction->args.at[0].as.value.as.Bool) {
            return instruction->args.at[1]._offset;
        }
        return -1;
    }
    JUMP: {
        return instruction->args.at[0]._offset;
    }
    END: {
        return -2;
    }
    INPUT: {
        char input[2048];
        fgets(input, sizeof(input) - 1, stdin);
        input[2047] = '\0';

        GroundString string = Ground.New.String(input);
        GroundValue value = Ground.New.Value.String(string);
        heap[instruction->args.at[0]._offset] = value;
        return -1;
    }
    PRINT: {
        for (size_t i = 0; i < instruction->args.len; i++) {
            GroundValue* val = &instruction->args.at[i].as.value;
            switch (val->type.type) {
                case GroundType_Int:
                    printf("%" PRId64, val->as.Int);
                    break;

                case GroundType_Double:
                    printf("%f", val->as.Double);
                    break;

                case GroundType_Bool:
                    printf(val->as.Bool ? "true" : "false");
                    break;

                case GroundType_Char:
                    printf("%c", val->as.Char);
                    break;

                case GroundType_String:
                    printf("%s", val->as.String.cstr);
                    break;

                default:
                    printf("<fixme>");
                    break;
            }
        }
        return -1;
    }
    PRINTLN: {
        for (size_t i = 0; i < instruction->args.len; i++) {
            GroundValue* val = &instruction->args.at[i].as.value;
            switch (val->type.type) {
                case GroundType_Int:
                    printf("%" PRId64, val->as.Int);
                    break;

                case GroundType_Double:
                    printf("%f", val->as.Double);
                    break;

                case GroundType_Bool:
                    printf(val->as.Bool ? "true" : "false");
                    break;

                case GroundType_Char:
                    printf("%c", val->as.Char);
                    break;

                case GroundType_String:
                    printf("%s", val->as.String.cstr);
                    break;

                default:
                    printf("<fixme>");
                    break;
            }
        }
        printf("\n");
        return -1;
    }
    SET: {}
    GETTYPE: {}
    EXISTS: {}
    SETLIST: {}
    SETLISTAT: {}
    GETLISTAT: {}
    GETLISTSIZE: {}
    LISTAPPEND: {}
    GETSTRSIZE: {}
    GETSTRCHARAT: {}
    ADD: {}
    SUBTRACT: {}
    MULTIPLY: {}
    DIVIDE: {}
    EQUAL: {}
    INEQUAL: {}
    NOT: {}
    GREATER: {}
    LESSER: {}
    AND: {}
    OR: {}
    XOR: {}
    NEG: {}
    SHIFT: {}
    STOI: {}
    STOD: {}
    ITOC: {}
    CTOI: {}
    TOSTRING: {}
    FUN: {}
    RETURN: {}
    ENDFUN: {}
    CALL: {}
    CALLMETHOD: {}
    STRUCT: {}
    ENDSTRUCT: {}
    INIT: {}
    GETFIELD: {}
    SETFIELD: {}
    USE: {}
    EXTERN: {}
    CREATELABEL: {}
    PAUSE: {}
    DROP: {}
    LICENSE: {}
    ERRORCMD: {}
    THROW: {}
    CATCH: {}

}