/*
    * display.cpp
    * Display tab for the embedded desktop settings app
    * Copyright (c) 2026 Daniel Hammer
*/

#include "settings_internal.hpp"

namespace settings_app {

void apply_ui_scale(int scale) {
    switch (scale) {
    case 0: fonts::UI_SIZE = 14; fonts::TITLE_SIZE = 14; fonts::TERM_SIZE = 14; fonts::LARGE_SIZE = 22; break;
    case 2: fonts::UI_SIZE = 22; fonts::TITLE_SIZE = 22; fonts::TERM_SIZE = 22; fonts::LARGE_SIZE = 34; break;
    default: fonts::UI_SIZE = 18; fonts::TITLE_SIZE = 18; fonts::TERM_SIZE = 18; fonts::LARGE_SIZE = 28; break;
    }
}

void settings_draw_display(Canvas& c, SettingsState* st) {
    DesktopSettings& s = st->desktop->settings;
    mtk::Theme theme = settings_theme(st);
    int x = 16;
    int y = 20;
    int btn_w = 60;
    int btn_h = 28;
    int bx = x + 180;

    c.text(x, y + 6, "Window Shadows", theme.text);
    mtk::draw_button(c, {bx, y, btn_w, btn_h}, "On", mtk::BUTTON_SECONDARY,
                     mtk::widget_state(s.show_shadows), theme);
    mtk::draw_button(c, {bx + btn_w + 8, y, btn_w, btn_h}, "Off", mtk::BUTTON_SECONDARY,
                     mtk::widget_state(!s.show_shadows), theme);
    y += btn_h + 20;

    mtk::draw_separator(c, x, y, c.w - 2 * x, theme);
    y += 16;

    c.text(x, y + 6, "Clock Format", theme.text);
    mtk::draw_button(c, {bx, y, btn_w, btn_h}, "24h", mtk::BUTTON_SECONDARY,
                     mtk::widget_state(s.clock_24h), theme);
    mtk::draw_button(c, {bx + btn_w + 8, y, btn_w, btn_h}, "12h", mtk::BUTTON_SECONDARY,
                     mtk::widget_state(!s.clock_24h), theme);
    y += btn_h + 20;

    mtk::draw_separator(c, x, y, c.w - 2 * x, theme);
    y += 16;

    c.text(x, y + 6, "UI Scale", theme.text);
    int sbw = 68;
    mtk::draw_button(c, {bx, y, sbw, btn_h}, "Small", mtk::BUTTON_SECONDARY,
                     mtk::widget_state(s.ui_scale == 0), theme);
    mtk::draw_button(c, {bx + sbw + 8, y, sbw, btn_h}, "Default", mtk::BUTTON_SECONDARY,
                     mtk::widget_state(s.ui_scale == 1), theme);
    mtk::draw_button(c, {bx + (sbw + 8) * 2, y, sbw, btn_h}, "Large", mtk::BUTTON_SECONDARY,
                     mtk::widget_state(s.ui_scale == 2), theme);
    y += btn_h + 20;

    mtk::draw_separator(c, x, y, c.w - 2 * x, theme);
    y += 16;

    c.text(x, y + 6, "UTC Offset", theme.text);
    Rect minus_btn = {bx, y, 36, btn_h};
    Rect plus_btn = {bx + 36 + 90, y, 36, btn_h};
    mtk::draw_button(c, minus_btn, "-", mtk::BUTTON_SECONDARY, mtk::widget_state(), theme);
    mtk::draw_button(c, plus_btn, "+", mtk::BUTTON_SECONDARY, mtk::widget_state(), theme);

    int off = s.tz_offset_minutes;
    int off_h = off / 60;
    int off_m = off % 60;
    if (off_m < 0) off_m = -off_m;

    char tz_label[16];
    if (off_m) {
        snprintf(tz_label, sizeof(tz_label), "UTC%s%d:%02d", off_h >= 0 ? "+" : "", off_h, off_m);
    } else {
        snprintf(tz_label, sizeof(tz_label), "UTC%s%d", off_h >= 0 ? "+" : "", off_h);
    }

    int tw = text_width(tz_label);
    int label_w = 90;
    c.text(bx + 36 + (label_w - tw) / 2, y + 6, tz_label, theme.text);
}

bool settings_handle_display_click(SettingsState* st, int mx, int cy) {
    DesktopSettings& s = st->desktop->settings;
    int x = 16;
    int y = 20;
    int btn_w = 60;
    int btn_h = 28;
    int bx = x + 180;

    Rect shadows_on = {bx, y, btn_w, btn_h};
    Rect shadows_off = {bx + btn_w + 8, y, btn_w, btn_h};
    if (shadows_on.contains(mx, cy)) {
        s.show_shadows = true;
        settings_persist(st);
        return true;
    }
    if (shadows_off.contains(mx, cy)) {
        s.show_shadows = false;
        settings_persist(st);
        return true;
    }
    y += btn_h + 20 + 16;

    Rect clock_24 = {bx, y, btn_w, btn_h};
    Rect clock_12 = {bx + btn_w + 8, y, btn_w, btn_h};
    if (clock_24.contains(mx, cy)) {
        s.clock_24h = true;
        settings_persist(st);
        return true;
    }
    if (clock_12.contains(mx, cy)) {
        s.clock_24h = false;
        settings_persist(st);
        return true;
    }
    y += btn_h + 20 + 16;

    int sbw = 68;
    Rect scale_small = {bx, y, sbw, btn_h};
    Rect scale_default = {bx + sbw + 8, y, sbw, btn_h};
    Rect scale_large = {bx + (sbw + 8) * 2, y, sbw, btn_h};
    if (scale_small.contains(mx, cy)) {
        s.ui_scale = 0;
        apply_ui_scale(0);
        montauk::win_setscale(0);
        settings_persist(st);
        return true;
    }
    if (scale_default.contains(mx, cy)) {
        s.ui_scale = 1;
        apply_ui_scale(1);
        montauk::win_setscale(1);
        settings_persist(st);
        return true;
    }
    if (scale_large.contains(mx, cy)) {
        s.ui_scale = 2;
        apply_ui_scale(2);
        montauk::win_setscale(2);
        settings_persist(st);
        return true;
    }
    y += btn_h + 20 + 16;

    Rect minus_btn = {bx, y, 36, btn_h};
    Rect plus_btn = {bx + 36 + 90, y, 36, btn_h};
    if (minus_btn.contains(mx, cy)) {
        if (s.tz_offset_minutes > -720) {
            s.tz_offset_minutes -= 60;
            montauk::settz(s.tz_offset_minutes);
            settings_persist_tz(st);
        }
        return true;
    }
    if (plus_btn.contains(mx, cy)) {
        if (s.tz_offset_minutes < 840) {
            s.tz_offset_minutes += 60;
            montauk::settz(s.tz_offset_minutes);
            settings_persist_tz(st);
        }
        return true;
    }

    return false;
}

} // namespace settings_app