#include <wums.h>
#include <coreinit/debug.h>
#include <coreinit/cache.h>
#include <coreinit/dynload.h>
#include <coreinit/memdefaultheap.h>
#include <memory>
#include "plugin/PluginContainer.h"
#include "globals.h"
#include "plugin/PluginDataFactory.h"
#include "plugin/PluginDataPersistence.h"
#include "plugin/PluginContainerPersistence.h"
#include "PluginManagement.h"
#include "hooks.h"
#include "patcher/hooks_patcher_static.h"

WUMS_MODULE_EXPORT_NAME("homebrew_wupsbackend");

WUMS_USE_WUT_DEVOPTAB();

WUMS_INITIALIZE(args) {
    initLogging();

    gModuleData = args.module_information;
    if (gModuleData == nullptr) {
        OSFatal("WUPS-Backend: Failed to get gModuleData pointer.");
    }
    if (gModuleData->version != MODULE_INFORMATION_VERSION) {
        OSFatal("WUPS-Backend: The module information struct version does not match.");
    }
    DEBUG_FUNCTION_LINE("Init successful");
    deinitLogging();
}

WUMS_APPLICATION_REQUESTS_EXIT() {
    CallHook(gPluginInformation, WUPS_LOADER_HOOK_APPLICATION_REQUESTS_EXIT);
    deinitLogging();
}

WUMS_APPLICATION_ENDS() {
    CallHook(gPluginInformation, WUPS_LOADER_HOOK_APPLICATION_ENDS);
    CallHook(gPluginInformation, WUPS_LOADER_HOOK_FINI_WRAPPER);
    CallHook(gPluginInformation, WUPS_LOADER_HOOK_FINI_WUT_SOCKETS);
    CallHook(gPluginInformation, WUPS_LOADER_HOOK_FINI_WUT_DEVOPTAB);
    CallHook(gPluginInformation, WUPS_LOADER_HOOK_FINI_WUT_STDCPP);
    CallHook(gPluginInformation, WUPS_LOADER_HOOK_FINI_WUT_NEWLIB);
    CallHook(gPluginInformation, WUPS_LOADER_HOOK_FINI_WUT_MALLOC);
    auto pluginInformation = gPluginInformation;
    for (int32_t plugin_index = pluginInformation->number_used_plugins - 1; plugin_index >= 0; plugin_index--) {
        FunctionPatcherRestoreDynamicFunctions(pluginInformation->plugin_data[plugin_index].info.functions, pluginInformation->plugin_data[plugin_index].info.number_used_functions);
    }
    FunctionPatcherRestoreDynamicFunctions(method_hooks_hooks_static, method_hooks_size_hooks_static);
}

void *allocOnCustomHeap(int alignment, int size);


WUMS_APPLICATION_STARTS() {
    uint32_t upid = OSGetUPID();
    if (upid != 2 && upid != 15) {
        return;
    }
    initLogging();
    bool initNeeded = false;
    if (gPluginDataHeap == nullptr) {
        DCFlushRange((void *) gModuleData, sizeof(module_information_t));
        uint32_t endAddress = 0;
        for (int i = 0; i < gModuleData->number_used_modules; i++) {
            uint32_t curEndAddr = gModuleData->module_data[i].endAddress;
            if (curEndAddr > endAddress) {
                endAddress = curEndAddr;
            }
        }

        memset((void *) &gLinkOnReload, 0, sizeof(gLinkOnReload));
        // If this address is 0, make sure the header common match the one
        // in the SetupPayload repo. (I know that's a bad idea)
        endAddress = (endAddress + 0x100) & 0xFFFFFF00;

        gPluginInformationHeapSize = 0x00FFF000 - endAddress;

        DEBUG_FUNCTION_LINE("Create heap for plugins information");
        gPluginInformationHeap = MEMCreateExpHeapEx((void *) (endAddress), gPluginInformationHeapSize, 0);

        if (gPluginInformationHeap == nullptr) {
            OSFatal("PluginBackend: Failed to allocate memory for plugin information");
        }

        void *pluginHeapMemory = allocOnCustomHeap(0x1000, PLUGIN_DATA_HEAP_SIZE);
        if (pluginHeapMemory == nullptr) {
            DEBUG_FUNCTION_LINE("Use plugins information heap as fallback");
            gPluginDataHeap = gPluginInformationHeap;
            gPluginDataHeapSize = gPluginInformationHeapSize;
        } else {
            gPluginDataHeap = MEMCreateExpHeapEx(pluginHeapMemory, PLUGIN_DATA_HEAP_SIZE, 0);
            gPluginDataHeapSize = PLUGIN_DATA_HEAP_SIZE;
        }

        if (gPluginDataHeap != nullptr) {
            if (gPluginInformation == nullptr) {
                DEBUG_FUNCTION_LINE_VERBOSE("Allocate gPluginInformation on heap %08X (size: %d bytes)", gPluginInformationHeap, sizeof(plugin_information_t));
                gPluginInformation = (plugin_information_t *) MEMAllocFromExpHeapEx(gPluginInformationHeap, sizeof(plugin_information_t), 4);
                if (gPluginInformation == nullptr) {
                    OSFatal("PluginBackend: Failed to allocate global plugin information");
                    return;
                }
                memset((void *) gPluginInformation, 0, sizeof(plugin_information_t));
            }
            if (gTrampolineData == nullptr) {
                DEBUG_FUNCTION_LINE_VERBOSE("Allocate gTrampolineData on heap %08X (size: %d bytes)", gPluginDataHeap, sizeof(relocation_trampoline_entry_t) * NUMBER_OF_TRAMPS);
                gTrampolineData = (relocation_trampoline_entry_t *) MEMAllocFromExpHeapEx(gPluginDataHeap, sizeof(relocation_trampoline_entry_t) * NUMBER_OF_TRAMPS, 4);
                if (gTrampolineData == nullptr) {
                    OSFatal("PluginBackend: Failed to allocate gTrampolineData");
                    return;
                }
                gTrampolineDataSize = NUMBER_OF_TRAMPS;
                memset((void *) gTrampolineData, 0, sizeof(relocation_trampoline_entry_t) * NUMBER_OF_TRAMPS);
            }
            DEBUG_FUNCTION_LINE("Available memory for storing plugins: %d kb", MEMGetAllocatableSizeForExpHeapEx(gPluginDataHeap, 4) / 1024);
            std::vector<std::shared_ptr<PluginData>> pluginList = PluginDataFactory::loadDir("fs:/vol/external01/wiiu/plugins/", gPluginDataHeap);
            DEBUG_FUNCTION_LINE("Loaded data for %d plugins.", pluginList.size());


            auto plugins = PluginManagement::loadPlugins(pluginList, gPluginDataHeap, gTrampolineData, gTrampolineDataSize);
            for (auto &pluginContainer: plugins) {
#ifdef DEBUG
                for (const auto &kv: pluginContainer->getPluginInformation()->getSectionInfoList()) {
                    DEBUG_FUNCTION_LINE_VERBOSE("%s = %s %08X %d", kv.first.c_str(), kv.second->getName().c_str(), kv.second->getAddress(), kv.second->getSize());
                }
#endif
                if (!PluginContainerPersistence::savePlugin(gPluginInformation, pluginContainer, gPluginDataHeap)) {
                    DEBUG_FUNCTION_LINE("Failed to save plugin");
                }
            }

            initNeeded = true;
        }
    }
    if (gLinkOnReload.loadOnReload) {
        DEBUG_FUNCTION_LINE("Reload with new plugin list.");
        std::vector<std::shared_ptr<PluginData>> pluginDataList;
        for (int32_t i = 0; i < gLinkOnReload.number_used_plugins; i++) {
            auto pluginData = PluginDataPersistence::load(&gLinkOnReload.plugin_data[i]);
            pluginDataList.push_back(pluginData);
        }

        for (int32_t plugin_index = 0; plugin_index < gPluginInformation->number_used_plugins; plugin_index++) {
            plugin_information_single_t *plugin = &(gPluginInformation->plugin_data[plugin_index]);
            BOOL doDelete = true;
            for (auto &pluginData: pluginDataList) {
                if (pluginData->buffer == plugin->data.buffer) {
                    doDelete = false;
                    break;
                }
            }
            if (doDelete) {
                DEBUG_FUNCTION_LINE("We need to delete the plugin data for plugin %s", plugin->meta.name);
                if (plugin->data.buffer != nullptr) {
                    if (plugin->data.memoryType == eMemTypeMEM2) {
                        DEBUG_FUNCTION_LINE_VERBOSE("Free plugin data buffer for %s [%08X]", plugin->meta.name, plugin->data.buffer);
                        free(plugin->data.buffer);
                    } else if (plugin->data.memoryType == eMemTypeExpHeap) {
                        DEBUG_FUNCTION_LINE_VERBOSE("Free plugin data buffer for %s [%08X on heap %08X]", plugin->meta.name, plugin->data.buffer, plugin->data.heapHandle);
                        MEMFreeToExpHeap((MEMHeapHandle) plugin->data.heapHandle, plugin->data.buffer);
                    } else {
                        DEBUG_FUNCTION_LINE("########################");
                        DEBUG_FUNCTION_LINE("Failed to free memory from plugin");
                        DEBUG_FUNCTION_LINE("########################");
                    }
                    plugin->data.buffer = nullptr;
                    plugin->data.bufferLength = 0;
                } else {
                    DEBUG_FUNCTION_LINE("Plugin %s has no copy of elf saved in memory, can't free it", plugin->meta.name);
                }
            }
        }

        PluginManagement::unloadPlugins(gPluginInformation, gPluginDataHeap, false);

        auto plugins = PluginManagement::loadPlugins(pluginDataList, gPluginDataHeap, gTrampolineData, gTrampolineDataSize);

        for (auto &pluginContainer: plugins) {
            DEBUG_FUNCTION_LINE("Stored information for plugin %s ; %s", pluginContainer->getMetaInformation()->getName().c_str(), pluginContainer->getMetaInformation()->getAuthor().c_str());
            if (!PluginContainerPersistence::savePlugin(gPluginInformation, pluginContainer, gPluginDataHeap)) {
                DEBUG_FUNCTION_LINE("Failed to save plugin");
            }
        }
        gLinkOnReload.loadOnReload = false;
        initNeeded = true;
    }

    if (gPluginDataHeap != nullptr) {
        auto plugins = PluginContainerPersistence::loadPlugins(gPluginInformation);
        PluginManagement::doRelocations(plugins, gTrampolineData, DYN_LINK_TRAMPOLINE_LIST_LENGTH);
        // PluginManagement::memsetBSS(plugins);

        DCFlushRange((void *) gPluginDataHeap, gPluginDataHeapSize);
        ICInvalidateRange((void *) gPluginDataHeap, gPluginDataHeapSize);
        DCFlushRange((void *) gPluginInformation, sizeof(plugin_information_t));
        ICInvalidateRange((void *) gPluginInformation, sizeof(plugin_information_t));

        CallHook(gPluginInformation, WUPS_LOADER_HOOK_INIT_WUT_MALLOC);
        CallHook(gPluginInformation, WUPS_LOADER_HOOK_INIT_WUT_NEWLIB);
        CallHook(gPluginInformation, WUPS_LOADER_HOOK_INIT_WUT_STDCPP);
        CallHook(gPluginInformation, WUPS_LOADER_HOOK_INIT_WUT_DEVOPTAB);
        CallHook(gPluginInformation, WUPS_LOADER_HOOK_INIT_WUT_SOCKETS);

        CallHook(gPluginInformation, WUPS_LOADER_HOOK_INIT_WRAPPER);

        if (initNeeded) {
            PluginManagement::callInitHooks(gPluginInformation);
        }

        PluginManagement::PatchFunctionsAndCallHooks(gPluginInformation);
    }
}

void *allocOnCustomHeap(int alignment, int size) {
    OSDynLoad_Module module;
    OSDynLoad_Error dyn_res = OSDynLoad_Acquire("homebrew_memorymapping", &module);
    if (dyn_res != OS_DYNLOAD_OK) {
        return nullptr;
    }
    uint32_t *custom_memalign;
    dyn_res = OSDynLoad_FindExport(module, true, "MEMAllocFromMappedMemoryEx", reinterpret_cast<void **>(&custom_memalign));
    auto *customMEMAllocFromDefaultHeapEx = (void *(*)(uint32_t, int)) *custom_memalign;

    if (dyn_res != OS_DYNLOAD_OK) {
        return nullptr;
    }
    return customMEMAllocFromDefaultHeapEx(size, alignment);
}