#define WLR_USE_UNSTABLE

#include <unistd.h>

#include <hyprland/src/Compositor.hpp>
#include <hyprland/src/desktop/Window.hpp>
#include <hyprland/src/config/ConfigManager.hpp>
#include <hyprland/src/desktop/DesktopTypes.hpp>

#include "globals.hpp"
#include "overview.hpp"

// Methods
inline CFunctionHook* g_pRenderWorkspaceHook = nullptr;
inline CFunctionHook* g_pAddDamageHookA      = nullptr;
inline CFunctionHook* g_pAddDamageHookB      = nullptr;
typedef void          (*origRenderWorkspace)(void*, CMonitor*, PHLWORKSPACE, timespec*, const CBox&);
typedef void          (*origAddDamageA)(void*, const CBox*);
typedef void          (*origAddDamageB)(void*, const pixman_region32_t*);

// Do NOT change this function.
APICALL EXPORT std::string PLUGIN_API_VERSION() {
    return HYPRLAND_API_VERSION;
}

static bool renderingOverview = false;

//
static void hkRenderWorkspace(void* thisptr, CMonitor* pMonitor, PHLWORKSPACE pWorkspace, timespec* now, const CBox& geometry) {
    if (!g_pOverview || renderingOverview || g_pOverview->blockOverviewRendering || g_pOverview->pMonitor != pMonitor)
        ((origRenderWorkspace)(g_pRenderWorkspaceHook->m_pOriginal))(thisptr, pMonitor, pWorkspace, now, geometry);
    else
        g_pOverview->render();
}

static void hkAddDamageA(void* thisptr, const CBox* box) {
    const auto PMONITOR = (CMonitor*)thisptr;

    if (!g_pOverview || g_pOverview->pMonitor != PMONITOR || g_pOverview->blockDamageReporting) {
        ((origAddDamageA)g_pAddDamageHookA->m_pOriginal)(thisptr, box);
        return;
    }

    g_pOverview->onDamageReported();
}

static void hkAddDamageB(void* thisptr, const pixman_region32_t* rg) {
    const auto PMONITOR = (CMonitor*)thisptr;

    if (!g_pOverview || g_pOverview->pMonitor != PMONITOR || g_pOverview->blockDamageReporting) {
        ((origAddDamageB)g_pAddDamageHookB->m_pOriginal)(thisptr, rg);
        return;
    }

    g_pOverview->onDamageReported();
}

static float gestured       = 0;
bool         swipeActive    = false;
char         swipeDirection = 0; // 0 = no direction, 'v' = vertical, 'h' = horizontal

static void  swipeBegin(void* self, SCallbackInfo& info, std::any param) {
    swipeActive    = false;
    swipeDirection = 0;
}

static void swipeUpdate(void* self, SCallbackInfo& info, std::any param) {
    static auto* const* PENABLE   = (Hyprlang::INT* const*)HyprlandAPI::getConfigValue(PHANDLE, "plugin:hyprexpo:enable_gesture")->getDataStaticPtr();
    static auto* const* FINGERS   = (Hyprlang::INT* const*)HyprlandAPI::getConfigValue(PHANDLE, "plugin:hyprexpo:gesture_fingers")->getDataStaticPtr();
    static auto* const* PPOSITIVE = (Hyprlang::INT* const*)HyprlandAPI::getConfigValue(PHANDLE, "plugin:hyprexpo:gesture_positive")->getDataStaticPtr();
    static auto* const* PDISTANCE = (Hyprlang::INT* const*)HyprlandAPI::getConfigValue(PHANDLE, "plugin:hyprexpo:gesture_distance")->getDataStaticPtr();
    auto                e         = std::any_cast<IPointer::SSwipeUpdateEvent>(param);

    if (!swipeDirection) {
        if (std::abs(e.delta.x) > std::abs(e.delta.y))
            swipeDirection = 'h';
        else if (std::abs(e.delta.y) > std::abs(e.delta.x))
            swipeDirection = 'v';
        else
            swipeDirection = 0;
    }

    if (swipeActive || g_pOverview)
        info.cancelled = true;

    if (!**PENABLE || e.fingers != **FINGERS || swipeDirection != 'v')
        return;

    info.cancelled = true;
    if (!swipeActive) {
        if (g_pOverview && (**PPOSITIVE ? 1.0 : -1.0) * e.delta.y <= 0) {
            renderingOverview = true;
            g_pOverview       = std::make_unique<COverview>(g_pCompositor->m_pLastMonitor->activeWorkspace, true);
            renderingOverview = false;
            gestured          = **PDISTANCE;
            swipeActive       = true;
        }

        else if (!g_pOverview && (**PPOSITIVE ? 1.0 : -1.0) * e.delta.y > 0) {
            renderingOverview = true;
            g_pOverview       = std::make_unique<COverview>(g_pCompositor->m_pLastMonitor->activeWorkspace, true);
            renderingOverview = false;
            gestured          = 0;
            swipeActive       = true;
        }

        else {
            return;
        }
    }

    gestured += (**PPOSITIVE ? 1.0 : -1.0) * e.delta.y;
    if (gestured <= 0.01) // plugin will crash if swipe ends at <= 0
        gestured = 0.01;
    g_pOverview->onSwipeUpdate(gestured);
}

static void swipeEnd(void* self, SCallbackInfo& info, std::any param) {
    if (!g_pOverview)
        return;

    swipeActive    = false;
    info.cancelled = true;

    g_pOverview->onSwipeEnd();
}

static void onExpoDispatcher(std::string arg) {

    if (swipeActive)
        return;
    if (arg == "toggle") {
        if (g_pOverview)
            g_pOverview->close();
        else {
            renderingOverview = true;
            g_pOverview       = std::make_unique<COverview>(g_pCompositor->m_pLastMonitor->activeWorkspace);
            renderingOverview = false;
        }
        return;
    }

    if (arg == "off" || arg == "close" || arg == "disable") {
        if (g_pOverview)
            g_pOverview->close();
        return;
    }

    if (g_pOverview)
        return;

    renderingOverview = true;
    g_pOverview       = std::make_unique<COverview>(g_pCompositor->m_pLastMonitor->activeWorkspace);
    renderingOverview = false;
}

static void failNotif(const std::string& reason) {
    HyprlandAPI::addNotification(PHANDLE, "[hyprexpo] Failure in initialization: " + reason, CColor{1.0, 0.2, 0.2, 1.0}, 5000);
}

APICALL EXPORT PLUGIN_DESCRIPTION_INFO PLUGIN_INIT(HANDLE handle) {
    PHANDLE = handle;

    const std::string HASH = __hyprland_api_get_hash();

    if (HASH != GIT_COMMIT_HASH) {
        failNotif("Version mismatch (headers ver is not equal to running hyprland ver)");
        throw std::runtime_error("[he] Version mismatch");
    }

    auto FNS = HyprlandAPI::findFunctionsByName(PHANDLE, "renderWorkspace");
    if (FNS.empty()) {
        failNotif("no fns for hook renderWorkspace");
        throw std::runtime_error("[he] No fns for hook renderWorkspace");
    }

    g_pRenderWorkspaceHook = HyprlandAPI::createFunctionHook(PHANDLE, FNS[0].address, (void*)hkRenderWorkspace);

    FNS = HyprlandAPI::findFunctionsByName(PHANDLE, "addDamageEPK15pixman_region32");
    if (FNS.empty()) {
        failNotif("no fns for hook addDamageEPK15pixman_region32");
        throw std::runtime_error("[he] No fns for hook addDamageEPK15pixman_region32");
    }

    g_pAddDamageHookB = HyprlandAPI::createFunctionHook(PHANDLE, FNS[0].address, (void*)hkAddDamageB);

    FNS = HyprlandAPI::findFunctionsByName(PHANDLE, "addDamageEPKN9Hyprutils4Math4CBoxE");
    if (FNS.empty()) {
        failNotif("no fns for hook addDamageEPKN9Hyprutils4Math4CBoxE");
        throw std::runtime_error("[he] No fns for hook addDamageEPKN9Hyprutils4Math4CBoxE");
    }

    g_pAddDamageHookA = HyprlandAPI::createFunctionHook(PHANDLE, FNS[0].address, (void*)hkAddDamageA);

    bool success = g_pRenderWorkspaceHook->hook();
    success      = success && g_pAddDamageHookA->hook();
    success      = success && g_pAddDamageHookB->hook();

    if (!success) {
        failNotif("Failed initializing hooks");
        throw std::runtime_error("[he] Failed initializing hooks");
    }

    static auto P = HyprlandAPI::registerCallbackDynamic(PHANDLE, "preRender", [](void* self, SCallbackInfo& info, std::any param) {
        if (!g_pOverview)
            return;
        g_pOverview->onPreRender();
    });

    static auto P2 = HyprlandAPI::registerCallbackDynamic(PHANDLE, "swipeBegin", [](void* self, SCallbackInfo& info, std::any data) { swipeBegin(self, info, data); });
    static auto P3 = HyprlandAPI::registerCallbackDynamic(PHANDLE, "swipeEnd", [](void* self, SCallbackInfo& info, std::any data) { swipeEnd(self, info, data); });
    static auto P4 = HyprlandAPI::registerCallbackDynamic(PHANDLE, "swipeUpdate", [](void* self, SCallbackInfo& info, std::any data) { swipeUpdate(self, info, data); });

    HyprlandAPI::addDispatcher(PHANDLE, "hyprexpo:expo", onExpoDispatcher);

    HyprlandAPI::addConfigValue(PHANDLE, "plugin:hyprexpo:columns", Hyprlang::INT{3});
    HyprlandAPI::addConfigValue(PHANDLE, "plugin:hyprexpo:gap_size", Hyprlang::INT{5});
    HyprlandAPI::addConfigValue(PHANDLE, "plugin:hyprexpo:bg_col", Hyprlang::INT{0xFF111111});
    HyprlandAPI::addConfigValue(PHANDLE, "plugin:hyprexpo:workspace_method", Hyprlang::STRING{"center current"});

    HyprlandAPI::addConfigValue(PHANDLE, "plugin:hyprexpo:enable_gesture", Hyprlang::INT{1});
    HyprlandAPI::addConfigValue(PHANDLE, "plugin:hyprexpo:gesture_distance", Hyprlang::INT{200});
    HyprlandAPI::addConfigValue(PHANDLE, "plugin:hyprexpo:gesture_positive", Hyprlang::INT{1});
    HyprlandAPI::addConfigValue(PHANDLE, "plugin:hyprexpo:gesture_fingers", Hyprlang::INT{4});

    HyprlandAPI::reloadConfig();

    return {"hyprexpo", "A plugin for an overview", "Vaxry", "1.0"};
}

APICALL EXPORT void PLUGIN_EXIT() {
    ;
}