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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2023 Olaf Wintermann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "pch.h"

#include "text.h"

#include "../common/context.h"
#include "../common/object.h"

#include <cx/string.h>
#include <cx/allocator.h>

#include "util.h"
#include "container.h"



using namespace winrt;
using namespace Microsoft::UI::Xaml;
using namespace Microsoft::UI::Xaml::Controls;
using namespace Windows::UI::Xaml::Interop;
using namespace winrt::Windows::Foundation;
using namespace Microsoft::UI::Xaml::Markup;
using namespace Microsoft::UI::Xaml::Media;
using namespace winrt::Microsoft::UI::Xaml::Controls::Primitives;
using namespace winrt::Windows::UI::Xaml::Input;


UIEXPORT UIWIDGET ui_textarea_create(UiObject *obj, UiTextAreaArgs args) {
    UiObject* current = uic_current_obj(obj);

    // create textarea and toolkit wrapper
    TextBox textarea = TextBox();
    textarea.AcceptsReturn(true);
    ScrollViewer::SetVerticalScrollBarVisibility(textarea, ScrollBarVisibility::Auto);
    UIElement elm = textarea;
    UiWidget* widget = new UiWidget(elm);
    ui_context_add_widget_destructor(current->ctx, widget);
    ui_set_widget_groups(current->ctx, widget, args.groups);

    UiVar* var = uic_widget_var(obj->ctx, current->ctx, args.value, args.varname, UI_VAR_TEXT);
    if (var) {
        UiText* value = (UiText*)var->value;
        value->obj = widget;
        value->undomgr = NULL;
        value->set = ui_textarea_set;
        value->get = ui_textarea_get;
        value->getsubstr = ui_textarea_getsubstr;
        value->insert = ui_textarea_insert;
        value->setposition = ui_textarea_setposition;
        value->position = ui_textarea_position;
        value->selection = ui_textarea_selection;
        value->length = ui_textarea_length;
        value->remove = ui_textarea_remove;
    }

    // add textarea to current container
    UI_APPLY_LAYOUT1(current, args);

    current->container->Add(textarea, true);

    return widget;
}

UIEXPORT UIWIDGET ui_textarea_gettextwidget(UIWIDGET textarea) {
    return textarea;
}

UIEXPORT void ui_text_undo(UiText *value) {

}

UIEXPORT void ui_text_redo(UiText *value) {

}

// -------------------------- getter/setter for textarea UiText --------------------------

char* ui_wtext_get(UiText *text, std::wstring &value) {
    if (text->value.ptr) {
        text->value.free(text->value.ptr);
    }

    text->value.ptr = wchar2utf8(value.c_str(), value.length());
    text->value.free = free;

    return text->value.ptr;
}

std::wstring ui_wtext_set(UiText *text, const char* value) {
    if (text->value.ptr) {
        text->value.free(text->value.ptr);
    }

    text->value.ptr = _strdup(value);
    text->value.free = free;

    int len;
    wchar_t* wstr = str2wstr(value, &len);
    std::wstring s(wstr);
    free(wstr);

    return s;
}

extern "C" char* ui_textarea_get(UiText *text) {
    UiWidget* widget = (UiWidget*)text->obj;
    TextBox box = widget->uielement.as<TextBox>();
    std::wstring wstr(box.Text());
    return ui_wtext_get(text, wstr);
}

extern "C" void  ui_textarea_set(UiText *text, const char *newvalue) {
    UiWidget* widget = (UiWidget*)text->obj;
    TextBox box = widget->uielement.as<TextBox>();
    box.Text(ui_wtext_set(text, newvalue));
}

extern "C" char* ui_textarea_getsubstr(UiText *text, int begin, int end) {
    return NULL;
}

extern "C" void  ui_textarea_insert(UiText *text, int pos, char *str) {

}

extern "C" void  ui_textarea_setposition(UiText *text, int pos) {

}

extern "C" int   ui_textarea_position(UiText *text) {
    return 0;
}

extern "C" void  ui_textarea_selection(UiText *text, int *begin, int *end) {

}

extern "C" int   ui_textarea_length(UiText *text) {
    return 0;
}

extern "C" void  ui_textarea_remove(UiText *text, int begin, int end) {

}




UIWIDGET ui_textfield_create(UiObject* obj, UiTextFieldArgs args) {
    UiObject* current = uic_current_obj(obj);

    // create textbox and toolkit wrapper
    TextBox textfield = TextBox();
    UIElement elm = textfield;
    UiWidget* widget = new UiWidget(elm);
    ui_context_add_widget_destructor(current->ctx, widget);
    ui_set_widget_groups(current->ctx, widget, args.groups);

    UiVar* var = uic_widget_var(obj->ctx, current->ctx, args.value, args.varname, UI_VAR_STRING);
    if (var) {
        UiString* value = (UiString*)var->value;
        value->obj = widget;
        value->get = ui_textfield_get;
        value->set = ui_textfield_set;

        // listener for notifying observers
        // TODO:
    }
    
    // add textfield to current container
    UI_APPLY_LAYOUT1(current, args);

    current->container->Add(textfield, false);

    return widget;
}

UIWIDGET ui_frameless_textfield_create(UiObject* obj, UiTextFieldArgs args) {
    return ui_textfield_create(obj, args);
}

UIWIDGET ui_passwordfield_create(UiObject* obj, UiTextFieldArgs args) {
    UiObject* current = uic_current_obj(obj);

    // create textbox and toolkit wrapper
    PasswordBox textfield = PasswordBox();
    UIElement elm = textfield;
    UiWidget* widget = new UiWidget(elm);
    ui_context_add_widget_destructor(current->ctx, widget);
    ui_set_widget_groups(current->ctx, widget, args.groups);

    UiVar* var = uic_widget_var(obj->ctx, current->ctx, args.value, args.varname, UI_VAR_STRING);
    if (var) {
        UiString* value = (UiString*)var->value;
        value->obj = widget;
        value->get = ui_passwordfield_get;
        value->set = ui_passwordfield_set;

        // listener for notifying observers
        // TODO:
    }

    // add textfield to current container
    UI_APPLY_LAYOUT1(current, args);

    current->container->Add(textfield, false);

    return widget;
}


// -------------------------- getter/setter for textfield UiString --------------------------

char* ui_wstring_get(UiString* str, std::wstring &value) {
    if (str->value.ptr) {
        str->value.free(str->value.ptr);
    }

    str->value.ptr = wchar2utf8(value.c_str(), value.length());
    str->value.free = free;

    return str->value.ptr;
}

std::wstring ui_wstring_set(UiString* str, const char* value) {
    if (str->value.ptr) {
        str->value.free(str->value.ptr);
    }

    str->value.ptr = _strdup(value);
    str->value.free = free;

    int len;
    wchar_t* wstr = str2wstr(value, &len);
    std::wstring s(wstr);
    free(wstr);

    return s;
}

char* ui_textfield_get(UiString * str) {
    UiWidget* widget = (UiWidget*)str->obj;
    TextBox box = widget->uielement.as<TextBox>();
    std::wstring wstr(box.Text());
    return ui_wstring_get(str, wstr);
}

void  ui_textfield_set(UiString * str, const char* newvalue) {
    UiWidget* widget = (UiWidget*)str->obj;
    TextBox box = widget->uielement.as<TextBox>();
    box.Text(ui_wstring_set(str, newvalue));
}


char* ui_passwordfield_get(UiString * str) {
    UiWidget* widget = (UiWidget*)str->obj;
    PasswordBox box = widget->uielement.as<PasswordBox>();
    std::wstring wstr(box.Password());
    return ui_wstring_get(str, wstr);
}

void  ui_passwordfield_set(UiString * str, const char* newvalue) {
    UiWidget* widget = (UiWidget*)str->obj;
    PasswordBox box = widget->uielement.as<PasswordBox>();
    box.Password(ui_wstring_set(str, newvalue));
}


// ------------------------ path textfield --------------------------------------

extern "C" static void destroy_ui_pathtextfield(void* ptr) {
    UiPathTextField* pb = (UiPathTextField*)ptr;
    delete pb;
}

static void ui_context_add_pathtextfield_destructor(UiContext* ctx, UiPathTextField* pb) {
    cxMempoolRegister(ctx->mp, pb, destroy_ui_pathtextfield);
}

static void ui_pathtextfield_clear(StackPanel& buttons) {
    for (int i = buttons.Children().Size() - 1; i >= 0; i--) {
        buttons.Children().RemoveAt(i);
    }
}

static void ui_pathfield_free_pathelms(UiPathElm* elms, size_t nelm) {
    if (!elms) {
        return;
    }
    for (int i = 0; i < nelm; i++) {
        UiPathElm e = elms[i];
        free(e.name);
        free(e.path);
    }
    free(elms);
}

UiPathTextField::~UiPathTextField() {
    ui_pathfield_free_pathelms(this->current_path, this->current_path_nelms);
}

static UiPathElm* default_pathelm_func(const char* full_path, size_t len, size_t* ret_nelm, void* data) {
    cxstring *pathelms;
    size_t nelm = cx_strsplit_a(cxDefaultAllocator, cx_strn(full_path, len), CX_STR("/"), 4096, &pathelms);

    if (nelm == 0) {
        *ret_nelm = 0;
        return nullptr;
    }

    UiPathElm* elms = (UiPathElm*)calloc(nelm, sizeof(UiPathElm));
    size_t n = nelm;
    int j = 0;
    for (int i = 0; i < nelm; i++) {
        cxstring c = pathelms[i];
        if (c.length == 0) {
            if (i == 0) {
                c.length = 1;
            }
            else {
                n--;
                continue;
            }
        }

        cxmutstr m = cx_strdup(c);
        elms[j].name = m.ptr;
        elms[j].name_len = m.length;
        
        size_t elm_path_len = c.ptr + c.length - full_path;
        cxmutstr elm_path = cx_strdup(cx_strn(full_path, elm_path_len));
        elms[j].path = elm_path.ptr;
        elms[j].path_len = elm_path.length;

        j++;
    }
    *ret_nelm = n;

    return elms;
}

int ui_pathtextfield_update(UiPathTextField* pb, const char *full_path) {
    Grid grid = pb->grid;

    ui_pathelm_func getpathelm = pb->getpathelm;
    void* getpathelmdata = pb->getpathelmdata;

    size_t full_path_len = full_path ? strlen(full_path) : 0;

    size_t nelm = 0;
    UiPathElm* path_elm = getpathelm(full_path, full_path_len, &nelm, getpathelmdata);
    if (!path_elm) {
        return 1;
    }

    // hide textbox, show button panel
    pb->textbox.Visibility(Visibility::Collapsed);
    pb->buttons.Visibility(Visibility::Visible);

    // clear old buttons
    ui_pathtextfield_clear(pb->buttons); 

    ui_pathfield_free_pathelms(pb->current_path, pb->current_path_nelms);
    pb->current_path = path_elm;
    pb->current_path_nelms = nelm;

    // add new buttons
    int j = 0;
    for (int i = 0; i < nelm;i++) {
        UiPathElm elm = path_elm[i];
        wchar_t* wstr = str2wstr_len(elm.name, elm.name_len, nullptr);
        Button button = Button();
        button.Content(box_value(wstr));
        free(wstr);

        if (pb->onactivate) {
            button.Click([pb, j, elm](IInspectable const& sender, RoutedEventArgs) {
                // copy elm.path because it could be a non-terminated string
                cxmutstr elmpath = cx_strdup(cx_strn(elm.path, elm.path_len));

                UiEvent evt;
                evt.obj = pb->obj;
                evt.window = evt.obj->window;
                evt.document = evt.obj->ctx->document;
                evt.eventdata = elmpath.ptr;
                evt.intval = j;
                pb->onactivate(&evt, pb->onactivatedata);

                free(elmpath.ptr);
                });
        }

        Thickness t = { 0, 0, 1, 0 };
        CornerRadius c = { 0 ,0, 0, 0 };
        button.BorderThickness(t);
        button.CornerRadius(c);

        pb->buttons.Children().Append(button);

        j++;
    }

    return 0;
}

char* ui_path_textfield_get(UiString * str) {
    UiPathTextField* widget = (UiPathTextField*)str->obj;
    TextBox box = widget->textbox;
    std::wstring wstr(box.Text());
    return ui_wstring_get(str, wstr);
}

void  ui_path_textfield_set(UiString* str, const char* newvalue) {
    UiPathTextField* widget = (UiPathTextField*)str->obj;
    TextBox box = widget->textbox;
    box.Text(ui_wstring_set(str, newvalue));
    ui_pathtextfield_update(widget, newvalue);
}

UIEXPORT UIWIDGET ui_path_textfield_create(UiObject* obj, UiPathTextFieldArgs args) {
    UiObject* current = uic_current_obj(obj);

    // create view and toolkit wrapper
    Border pathbar = Border();

    IInspectable bgRes = Application::Current().Resources().Lookup(box_value(L"TextControlBackground"));
    IInspectable borderThicknessRes = Application::Current().Resources().Lookup(box_value(L"TextControlBorderThemeThickness"));
    IInspectable borderBrushRes = Application::Current().Resources().Lookup(box_value(L"TextControlBorderBrush"));
    // IInspectable cornerRes = Application::Current().Resources().Lookup(box_value(L"TextControlCornerRadius"));

    Brush bgBrush = unbox_value<Brush>(bgRes);
    Thickness border = unbox_value<Thickness>(borderThicknessRes);
    Brush borderBrush = unbox_value<Brush>(borderBrushRes);
    CornerRadius cornerRadius = { 4, 4, 4, 4 }; //unbox_value<CornerRadius>(cornerRes);

    pathbar.Background(bgBrush);
    pathbar.BorderBrush(borderBrush);
    pathbar.BorderThickness(border);
    pathbar.CornerRadius(cornerRadius);

    Grid content = Grid();
    pathbar.Child(content);

    GridLength gl;
    gl.Value = 0;
    gl.GridUnitType = GridUnitType::Auto;

    ColumnDefinition coldef = ColumnDefinition();
    coldef.Width(gl);
    content.ColumnDefinitions().Append(coldef);

    gl.Value = 1;
    gl.GridUnitType = GridUnitType::Star;

    ColumnDefinition coldef2 = ColumnDefinition();
    coldef2.Width(gl);
    content.ColumnDefinitions().Append(coldef2);

    TextBox pathTextBox = TextBox();
    Thickness t = { 0, 0, 0, 0 };
    CornerRadius c = { 0 ,0, 0, 0 };
    pathTextBox.BorderThickness(t);
    //pathTextBox.CornerRadius(c);


    pathTextBox.HorizontalAlignment(HorizontalAlignment::Stretch);
    content.SetColumn(pathTextBox, 0);
    content.SetColumnSpan(pathTextBox, 2);

    content.Children().Append(pathTextBox);

    // stackpanel for buttons
    StackPanel buttons = StackPanel();
    buttons.Orientation(Orientation::Horizontal);
    buttons.Visibility(Visibility::Collapsed);
    content.SetColumn(buttons, 0);
    content.Children().Append(buttons);

    TextBlock filler = TextBlock();
    filler.VerticalAlignment(VerticalAlignment::Stretch);
    //filler.Text(winrt::hstring(L"hello filler"));

    filler.HorizontalAlignment(HorizontalAlignment::Stretch);
    filler.VerticalAlignment(VerticalAlignment::Stretch);
    content.SetColumn(filler, 1);
    content.Children().Append(filler);

    filler.PointerPressed(
        winrt::Microsoft::UI::Xaml::Input::PointerEventHandler(
            [=](IInspectable const& sender, winrt::Microsoft::UI::Xaml::Input::PointerRoutedEventArgs const& args) {
                pathTextBox.Visibility(Visibility::Visible);
                buttons.Visibility(Visibility::Collapsed);
                filler.Visibility(Visibility::Collapsed);
                pathTextBox.SelectionStart(pathTextBox.Text().size());
                pathTextBox.SelectionLength(0);
                pathTextBox.Focus(FocusState::Keyboard);
            })
    );

    //pathTextBox.Visibility(Visibility::Collapsed);

    UiPathTextField* uipathbar = new UiPathTextField;
    ui_context_add_pathtextfield_destructor(current->ctx, uipathbar);
    uipathbar->grid = content;
    uipathbar->buttons = buttons;
    uipathbar->textbox = pathTextBox;
    uipathbar->filler = filler;
    uipathbar->obj = obj;
    uipathbar->getpathelm = args.getpathelm ? args.getpathelm : default_pathelm_func;
    uipathbar->getpathelmdata = args.getpathelmdata;
    uipathbar->onactivate = args.onactivate;
    uipathbar->onactivatedata = args.onactivatedata;
    uipathbar->ondragstart = args.ondragstart;
    uipathbar->ondragstartdata = args.ondragstartdata;
    uipathbar->ondragcomplete = args.ondragcomplete;
    uipathbar->ondragcompletedata = args.ondragcompletedata;
    uipathbar->ondrop = args.ondrop;
    uipathbar->ondropdata = args.ondropsdata;


    pathTextBox.KeyDown(
        winrt::Microsoft::UI::Xaml::Input::KeyEventHandler(
            [=](winrt::Windows::Foundation::IInspectable const& sender, winrt::Microsoft::UI::Xaml::Input::KeyRoutedEventArgs const& e) {
                auto key = e.Key();
                bool showButtons = false;
                bool update = false;
                if (key == Windows::System::VirtualKey::Escape) {
                    showButtons = true;
                }
                else if (key == Windows::System::VirtualKey::Enter) {
                    showButtons = true;
                    update = true;
                }

                if (showButtons) {
                    pathTextBox.Visibility(Visibility::Collapsed);
                    buttons.Visibility(Visibility::Visible);
                    filler.Visibility(Visibility::Visible);
                    if (update) {
                        std::wstring value(pathTextBox.Text());
                        char* full_path = wchar2utf8(value.c_str(), value.length());

                        if (!ui_pathtextfield_update(uipathbar, full_path)) {
                            UiEvent evt;
                            evt.obj = obj;
                            evt.window = obj->window;
                            evt.document = obj->ctx->document;
                            evt.eventdata = full_path;
                            evt.intval = -1;
                            args.onactivate(&evt, args.onactivatedata);
                        } 

                        free(full_path);
                    }

                    //buttons.Focus(FocusState::Keyboard);
                }
            })
    );


    UIElement elm = pathbar;
    UiWidget* widget = new UiWidget(elm);
    widget->data1 = uipathbar;
    ui_context_add_widget_destructor(current->ctx, widget);

    // bind var
    UiVar* var = uic_widget_var(obj->ctx, current->ctx, args.value, args.varname, UI_VAR_STRING);
    if (var) {
        UiString* value = (UiString*)var->value;
        value->obj = uipathbar;
        value->get = ui_path_textfield_get;
        value->set = ui_path_textfield_set;
    }

    // add listview to current container
    UI_APPLY_LAYOUT1(current, args);

    current->container->Add(pathbar, false);

    return widget;
}