/*  Copyright 2022 Pretendo Network contributors <pretendo.network>
	Copyright 2022 Ash Logan <ash@heyquark.com>

	Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby
	granted, provided that the above copyright notice and this permission notice appear in all copies.

	THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
	IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
	INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
	IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
	PERFORMANCE OF THIS SOFTWARE.
*/

#include "rplinfo.h"

#include "utils/logger.h"

#include <kernel/kernel.h>

#include <coreinit/cache.h>
#include <coreinit/memorymap.h>

std::optional<std::vector<OSDynLoad_NotifyData>> TryGetRPLInfo() {
    int num_rpls = OSDynLoad_GetNumberOfRPLs();
    if (num_rpls == 0) {
        return std::nullopt;
    }

    DEBUG_FUNCTION_LINE("num_rpls: %d", num_rpls);

    std::vector<OSDynLoad_NotifyData> rpls;
    rpls.resize(num_rpls);

    bool ret = OSDynLoad_GetRPLInfo(0, num_rpls, rpls.data());
    if (!ret) {
        return std::nullopt;
    }

    return rpls;
}

bool PatchInstruction(void *instr, uint32_t original, uint32_t replacement) {
    uint32_t current = *(uint32_t *) instr;
    DEBUG_FUNCTION_LINE("current instr %08x", current);
    if (current != original)
        return current == replacement;

    KernelCopyData(OSEffectiveToPhysical((uint32_t) instr), OSEffectiveToPhysical((uint32_t) &replacement), sizeof(replacement));
    // Only works on AROMA! WUPS 0.1's KernelCopyData is uncached, needs DCInvalidate here instead
    DCFlushRange(instr, 4);
    ICInvalidateRange(instr, 4);

    current = *(uint32_t *) instr;
    DEBUG_FUNCTION_LINE("patched instr %08x", current);

    return true;
}

bool PatchDynLoadFunctions() {
    uint32_t *patch1 = ((uint32_t *) &OSDynLoad_GetNumberOfRPLs) + 6;
    uint32_t *patch2 = ((uint32_t *) &OSDynLoad_GetRPLInfo) + 22;

    if (!PatchInstruction(patch1, 0x41820038 /* beq +38 */, 0x60000000 /*nop*/)) {
        return false;
    }
    if (!PatchInstruction(patch2, 0x41820100 /* beq +100 */, 0x60000000 /*nop*/)) {
        return false;
    }

    return true;
}