/*
Copyright (c) 2012-2024 R. Danbrook
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.

3. Neither the name of the copyright holder nor the names of its
   contributors may be used to endorse or promote products derived from
   this software without specific prior written permission.

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 <cstdio>
#include <cstring>
#include <iostream>
#include <sstream>
#include <unordered_map>

#include <FL/Fl.H>
#include <FL/Fl_Double_Window.H>
#include <FL/Fl_Box.H>
#include <FL/Fl_Button.H>
#include <FL/Fl_Gl_Window.H>
#include <FL/Fl_Tabs.H>
#include <FL/Fl_Choice.H>
#include <FL/Fl_Hor_Value_Slider.H>
#include <FL/Fl_Output.H>
#include <FL/Fl_Tooltip.H>
#include <FL/Fl_Table_Row.H>
#include <FL/fl_draw.H>

#include "fltkui.h"
#include "fltkui_settings.h"

namespace {

constexpr int UI_TABHEIGHT = 550;
constexpr int UI_TABWIDTH = 480;
constexpr unsigned UI_SETTINGS_PER_COL = 10;

std::unordered_map<int, std::string> keycodes = { //FL_Button ??
    { ' ', "Space" },
    { FL_BackSpace, "Backspace" },
    { FL_Tab, "Tab" },
    { FL_Iso_Key,"ISO Key" },
    { FL_Enter, "Enter" },
    { FL_Pause, "Pause" },
    { FL_Scroll_Lock, "Scroll Lock"},
    { FL_Escape, "Escape" },
    { FL_Kana, "Kana" },
    { FL_Eisu, "Eisu" },
    { FL_Yen, "Yen" },
    { FL_JIS_Underscore, "Underscore" },
    { FL_Home, "Home" },
    { FL_Left, "Left" },
    { FL_Up, "Up" },
    { FL_Right, "Right" },
    { FL_Down, "Down" },
    { FL_Page_Up, "Page Up" },
    { FL_Page_Down, "Page Down" },
    { FL_End, "End" },
    { FL_Print, "Print" },
    { FL_Insert, "Insert" },
    { FL_Menu, "Menu" },
    { FL_Help, "Help" },
    { FL_Num_Lock, "Num Lock" },
    { FL_KP + 0x2a, "KP *" },
    { FL_KP + 0x2b, "KP +" },
    { FL_KP + 0x2d, "KP -" },
    { FL_KP + 0x2f, "KP /" },
    { FL_KP + 0x30, "KP 0" },
    { FL_KP + 0x31, "KP 1" },
    { FL_KP + 0x32, "KP 2" },
    { FL_KP + 0x33, "KP 3" },
    { FL_KP + 0x34, "KP 4" },
    { FL_KP + 0x35, "KP 5" },
    { FL_KP + 0x36, "KP 6" },
    { FL_KP + 0x37, "KP 7" },
    { FL_KP + 0x38, "KP 8" },
    { FL_KP + 0x39, "KP 9" },
    { FL_KP_Enter, "KP Enter"},
    { FL_F + 1, "F1" },
    { FL_F + 2, "F2" },
    { FL_F + 3, "F3" },
    { FL_F + 4, "F4" },
    { FL_F + 5, "F5" },
    { FL_F + 6, "F6" },
    { FL_F + 7, "F7" },
    { FL_F + 8, "F8" },
    { FL_F + 9, "F9" },
    { FL_F + 10, "F10" },
    { FL_F + 11, "F11" },
    { FL_F + 12, "F12" },
    { FL_Shift_L, "Shift L" },
    { FL_Shift_R, "Shift R" },
    { FL_Control_L, "Control L" },
    { FL_Control_R, "Control R" },
    { FL_Caps_Lock, "Caps Lock" },
    { FL_Meta_L, "Meta L" },
    { FL_Meta_R, "Meta R" },
    { FL_Alt_L, "Alt L" },
    { FL_Alt_R, "Alt R" },
    { FL_Delete, "Delete" },
    //{ FL_Alt_Gr, "Alt Gr" },
    { FL_Volume_Down, "Volume Down" },
    { FL_Volume_Mute, "Volume Mute" },
    { FL_Volume_Up, "Volume Up" },
    { FL_Media_Play, "Play" },
    { FL_Media_Stop," Stop" },
    { FL_Media_Prev, "Prev" },
    { FL_Media_Next, "Next" },
    { FL_Home_Page, "Home Page" },
    { FL_Mail, "Mail" },
    { FL_Search, "Search" },
    { FL_Back, "Back" },
    { FL_Forward, "Forward" },
    { FL_Stop, "Stop" },
    { FL_Refresh, "Refresh" },
    { FL_Sleep, "Sleep" },
    { FL_Favorites, "Favorites" },
    { 1001, "Mouse 1" },
    { 1002, "Mouse 2" },
    { 1003, "Mouse 3" },
    { 1004, "Mouse 4" },
    { 1005, "Mouse 5" },
    { 1006, "Mouse 6" },
    { 1007, "Mouse 7" },
    { 1008, "Mouse 8" },
    { 1009, "Mouse 9" },
    { 1010, "Mouse 10" },
    { 1011, "Mouse 11" },
    { 1012, "Mouse 12" },
    { 1013, "Mouse 13" },
    { 1014, "Mouse 14" },
    { 1015, "Mouse 15" },
    { 1016, "Mouse 16" },
    { 1017, "Mouse 17" },
    { 1018, "Mouse 18" },
    { 1019, "Mouse 19" },
    { 1020, "Mouse 20" }
};

NstSettingsWindow *win{nullptr};
Fl_Box *msgbox{nullptr};

}

NstSettingsWindow::NstSettingsWindow(int w, int h, const char* t, JGManager& j, SettingManager& m, InputManager& i)
        : Fl_Double_Window(w, h, t), jgm(j), setmgr(m), inputmgr(i) {
    win = this;

    Fl_Tooltip::color(NstPurple);
    Fl_Tooltip::textcolor(NstLightGrey);

    Fl_Tabs *tabs = new Fl_Tabs(10, 5, UI_TABWIDTH, UI_TABHEIGHT);
    tabs->selection_color(NstGreen);
    tabs->labelcolor(NstWhite);

    Fl_Group *fetab = new Fl_Group(10, 30, UI_TABWIDTH, UI_TABHEIGHT, "Interface");
    populate(*setmgr.get_settings());
    fetab->end();

    Fl_Group *emutab = new Fl_Group(10, 30, UI_TABWIDTH, UI_TABHEIGHT, "Emulator");
    populate(*jgm.get_settings());
    emutab->end();

    Fl_Group *inputtab = new Fl_Group(10, 30, UI_TABWIDTH, UI_TABHEIGHT, "Input");
    populate(*jgm.get_settings(), true);
    populate_input();
    inputtab->end();

    tabs->end();

    Fl_Button *btn_ok = new Fl_Button(UI_TABWIDTH - 30, UI_TABHEIGHT + 15, 40, UI_ELEMHEIGHT, "&OK");
    btn_ok->callback(cb_ok_s, nullptr);
    btn_ok->shortcut(FL_ALT + 'o');

    this->end();
}

void NstSettingsWindow::show_inputmsg(int show) {
    if (!msgbox) {
        return;
    }

    switch (show) {
        case 0:
            msgbox->label("");
            break;
        case 1:
            msgbox->label("Press the desired key, ESC to clear");
            break;
        case 2:
            msgbox->label("Input definition already used");
            break;
    }

    msgbox->show();
    itable->redraw();
}

void NstSettingsWindow::set_choice_value(std::string tab, std::string label, int val) {
    // Tabs
    Fl_Group *g = this->as_group()->child(0)->as_group();
    bool tab_found = false;

    // Search for the tab
    for (int i = 0; i < g->children(); ++i) {
        if (std::string(g->child(i)->label()) == tab) {
            g = g->child(i)->as_group();
            tab_found = true;
            break;
        }
    }

    if (!tab_found) {
        return;
    }

    for (int i = 0; i < g->children(); ++i) {
        if (g->child(i)->label()) {
            if (std::string(g->child(i)->label()) == label) {
                ((Fl_Choice*)g->child(i))->value(val);
                break;
            }
        }
    }
}

void NstSettingsWindow::set_crt_active(bool active) {
    Fl_Group *g = this->as_group()->child(0)->as_group();

    for (int i = 0; i < g->children(); ++i) {
        if (std::string(g->child(i)->label()) == "Interface") {
            g = g->child(i)->as_group();
            break;
        }
    }

    for (int i = 0; i < g->children(); ++i) {
        if (g->child(i)->label()) {
            if (std::string(g->child(i)->label()).find("CRT") != std::string::npos) {
                if (active) {
                    g->child(i)->activate();
                }
                else {
                    g->child(i)->deactivate();
                }
            }
        }
    }
}

void NstSettingsWindow::cb_chooser(Fl_Widget *w, void *data) {
    jg_setting_t *setting = (jg_setting_t*)data;
    setting->val = ((Fl_Choice*)w)->value();

    if (setting->flags & FLAG_FRONTEND) {
        FltkUi::rehash();
    }
    else {
        jgm.rehash();
    }

    if (std::string(setting->name) == "v_postproc") {
        set_crt_active(setting->val == 3);
    }

    if (setting->flags & JG_SETTING_INPUT) {
        inputmgr.reassign();
    }
}

void NstSettingsWindow::cb_chooser_s(Fl_Widget *w, void *data) {
    win->cb_chooser(w, data);
}

void NstSettingsWindow::cb_slider(Fl_Widget *w, void *data) {
    jg_setting_t *setting = (jg_setting_t*)data;
    setting->val = ((Fl_Hor_Value_Slider*)w)->value();

    if (setting->flags & FLAG_FRONTEND) {
        FltkUi::rehash();
    }
    else {
        jgm.rehash();
        if (std::string(setting->name).find("overscan") != std::string::npos) {
            FltkUi::rehash();
        }
    }
}

void NstSettingsWindow::cb_slider_s(Fl_Widget *w, void *data) {
    win->cb_slider(w, data);
}

void NstSettingsWindow::cb_ok(Fl_Widget*, void*) {
    win->hide();
}

void NstSettingsWindow::cb_ok_s(Fl_Widget *w, void*) {
    win->cb_ok(w, nullptr);
}

void NstSettingsWindow::populate(const std::vector<jg_setting_t*>& settings, bool input_settings) {
    int xpos = 20;
    int ypos = 10;
    size_t j = 0;

    for (size_t i = 0; i < settings.size(); ++i) {
        if (input_settings == !(settings[i]->flags & JG_SETTING_INPUT)) {
            continue;
        }

        std::vector<std::string> opts;
        std::stringstream unparsed(settings[i]->opts);
        std::string temp;
        bool range = false;

        while (getline(unparsed, temp, ',')) {
            opts.push_back(temp.substr(temp.find("= ") + 2));
            if (temp[0] == 'N') {
                range = true;
                break;
            }
        }

        if (j && j % UI_SETTINGS_PER_COL == 0) {
            xpos += 220;
            ypos = 10;
        }
        ++j;

        ypos += UI_ELEMHEIGHT * 2;

        // Create a slider for range-based settings
        if (range) {
            Fl_Hor_Value_Slider *sld = new Fl_Hor_Value_Slider(xpos, ypos,
                                                               UI_ELEMWIDTH, UI_ELEMHEIGHT,
                                                               settings[i]->fname);
            sld->tooltip(settings[i]->desc);
            sld->align(FL_ALIGN_TOP_LEFT);
            sld->bounds(settings[i]->min, settings[i]->max);
            sld->box(FL_FLAT_BOX);
            sld->step(1);
            sld->selection_color(NstGreen);
            sld->type(FL_HOR_NICE_SLIDER);
            sld->callback(cb_slider_s, settings[i]);
            sld->value(settings[i]->val);
            continue;
        }

        // Create pulldown for non-range settings
        Fl_Choice *ch = new Fl_Choice(xpos, ypos,
                                      UI_ELEMWIDTH, UI_ELEMHEIGHT,
                                      settings[i]->fname);
        ch->tooltip(settings[i]->desc);
        ch->selection_color(NstGreen);
        ch->align(FL_ALIGN_TOP_LEFT);

        // Add options to the pulldown
        for (const auto& opt : opts) {
            ch->add(opt.c_str());
        }
        ch->callback(cb_chooser_s, settings[i]);
        ch->value(settings[i]->val);
    }
}

void NstSettingsWindow::cb_iselect(Fl_Widget *w, void *data) {
    itable->set_devicenum(((Fl_Choice*)w)->value());
    itable->rows(input_info[itable->get_devicenum()].numaxes +
                 input_info[itable->get_devicenum()].numbuttons);
    itable->redraw();
}

void NstSettingsWindow::cb_iselect_s(Fl_Widget *w, void *data) {
    win->cb_iselect(w, data);
}

void NstSettingsWindow::cb_itable(Fl_Widget *w, void *data) {
    InputTable *t = (InputTable*)w;
    int row = t->callback_row();

    if (Fl::event_clicks() > 0) {
        Fl::event_clicks(0); // Reset double-click counter
        itable->take_focus();
        show_inputmsg(1);
        inputmgr.set_inputcfg(input_info[t->get_devicenum()].name,
                              input_info[t->get_devicenum()].defs[t->callback_row()],
                              t->callback_row());
    }
    else {
        show_inputmsg(0);
    }
}

void NstSettingsWindow::cb_itable_s(Fl_Widget *w, void *data) {
    win->cb_itable(w, data);
}

int InputTable::handle(int e) {
    switch (e) {
        case FL_KEYUP: {
            if (inputmgr.get_cfg_running()) {
                if (Fl::event_key() == FL_Escape) { // Clear it
                    inputmgr.clear_inputdef();
                }
                else {
                    inputmgr.set_inputdef(Fl::event_key());
                }
                inputmgr.set_cfg_running(false);
                redraw();
                return 1;
            }
            break;
        }
        case FL_PUSH: {
            if (inputmgr.get_cfg_running()) {
                inputmgr.set_inputdef(Fl::event_button() + 1000);
                inputmgr.set_cfg_running(false);
                redraw();
                return 1;
            }
            break;
        }
        case FL_KEYDOWN: case FL_RELEASE: {
            if (inputmgr.get_cfg_running()) {
                return 1;
            }
            break;
        }
    }
    return Fl_Table_Row::handle(e);
}

void NstSettingsWindow::populate_input() {
    Fl_Choice *iselect = new Fl_Choice(200, UI_ELEMHEIGHT * 2 + 10,
                                       UI_ELEMWIDTH + 5, UI_ELEMHEIGHT,
                                       "Configure Input");
    iselect->tooltip("Select emulated device to configure");
    iselect->selection_color(NstGreen);
    iselect->align(FL_ALIGN_TOP_LEFT);

    itable = new InputTable(inputmgr, input_info,
                            200, 110, 275, 330);
    itable->set_devicenum(0);
    itable->cols(3);
    itable->col_width(0, 115);
    itable->col_width(1, 90);
    itable->col_width(2, 50);
    itable->color(NstWhite);
    itable->callback(cb_itable_s);

    input_info = inputmgr.get_inputinfo();

    for (auto& device : input_info) {
        iselect->add(device.fname);
    }

    iselect->callback(cb_iselect_s);

    iselect->value(0);
    itable->rows(input_info[0].numaxes + input_info[0].numbuttons);

    msgbox = new Fl_Box(200, 450, 240, UI_ELEMHEIGHT);
    msgbox->hide();
}

void InputTable::draw_cell(TableContext context, int r, int c, int x, int y, int w, int h) {
    switch (context) {
        case CONTEXT_CELL: {
            fl_push_clip(x, y, w, h);

            // Background
            fl_color(row_selected(r) ? NstGreen : NstWhite);
            fl_rectf(x, y, w, h);

            // Text
            const char *defname = input_info[devicenum].defs[r];
            std::string key{};
            fl_color(row_selected(r) ? NstWhite : FL_BLACK);
            const char *text;
            if (c == 0) {
                text = defname;
            }
            else if (c == 1) {
                key = inputmgr.get_inputdef(input_info[devicenum].name, defname);
                int keynum = key.empty() ? 0 : std::stoi(key);
                if (keycodes.count(keynum)) {
                    text = keycodes[keynum].c_str();
                }
                else if ((keynum >= 33 && keynum <= 126) || (keynum >= 1001 && keynum <= 1020)) {
                    key = std::string(1, keynum);
                    text = key.c_str();
                }
                else {
                    text = key.c_str();
                }
            }
            else if (c == 2) {
                text = inputmgr.get_inputdef(std::string(input_info[devicenum].name) + "j", defname).c_str();
            }

            fl_draw(text,
                    x, y, w, h,
                    c ? FL_ALIGN_LEFT : FL_ALIGN_CENTER);
            fl_pop_clip();

            return;
        }

        default: return;
    }
}