#include "my_slider.hpp"
#include <sstream>
#include <iomanip>
#include <util.hpp>
double MySlider::get_value() {
    return value;
}
void MySlider::update(bool force) {
    if (update_occurring) {
        return;
    }
    update_occurring = true;
    std::string value_str = to_string_with_decimals(value, digits_after_decimal);
    try {
        value = std::stod(value_str);
    } catch (std::out_of_range) {

    } catch (std::invalid_argument) {

    }
    if (text_editing) {
        edit_btn.set_icon_name("document-save-symbolic");
    } else {
        edit_btn.set_icon_name("edit-symbolic");
    }
    std::vector<Glib::ustring> classes;
    classes.push_back("precise-slider");
    if (text_editing) {
        classes.push_back("text-editing");
    }
    if (get_hexpand()) {
        classes.push_back("hexpand");
    }
    set_css_classes(classes);
    update_log_data();
    if (min_value <= max_value) {
        if (logarithmic) {
            slider.set_range(log_data.x0, log_data.x1);
        } else {
            slider.set_range(min_value, max_value);
        }
    }
    prefix_label.set_text(prefix);
    value_label.set_text(value_str.c_str());
    suffix_label.set_text(suffix);
    text_entry.set_visible(text_editing);
    value_label.set_visible(!text_editing);
    slider.set_visible(!text_editing);
    if (force || text_editing) {
        update_slider(value);
    }
    if (force || !text_editing) {
        update_text_entry(value_str);
    }
    update_occurring = false;
}
double MySlider::scale_log(double input) {
    return log_data.a + (log_data.b * log(value));
}
void MySlider::update_log_data() {
    log_data.xmin = min_value;
    log_data.xmax = max_value;
    log_data.x0 = log(log_data.xmin);
    log_data.x1 = log(log_data.xmax);
    log_data.b = (log_data.x1 - log_data.x0) / log(log_data.xmax - log_data.xmin);
    log_data.a = log_data.x0 - (log_data.b * log_data.x0);
}
void MySlider::set_logarithmic(bool value) {
    logarithmic = true;
    update_log_data();
}
bool MySlider::get_logarithmic() {
    return logarithmic;
}
double MySlider::unscale_log(double input) {
    return (exp(value) / log_data.b) - log_data.a;
}
void MySlider::set_value(double value, bool force) {
    this->value = value;
    update(force);
}
Glib::ustring MySlider::get_prefix() {
    return prefix;
}
void MySlider::set_prefix(Glib::ustring value) {
    prefix = value;
}
Glib::ustring MySlider::get_suffix() {
    return suffix;
}
void MySlider::set_suffix(Glib::ustring value) {
    suffix = value;
}
unsigned MySlider::get_digits_after_decimal() {
    return digits_after_decimal;
}
void MySlider::set_digits_after_decimal(unsigned value) {
    digits_after_decimal = value;
    slider.set_digits(digits_after_decimal);
}
void MySlider::update_text_entry(std::string text) {
    text_entry.delete_text(0, text_entry.get_text_length());
    int pos = 0;
    text_entry.insert_text(text.c_str(), text.size(), pos);
}
void MySlider::update_slider(double value) {
    if (logarithmic) {
        slider.set_value(scale_log(value));
    }
}
double MySlider::get_min_value() {
    return min_value;
}
void MySlider::set_min_value(double value) {
    min_value = value;
    update_log_data();
}
double MySlider::get_max_value() {
    return max_value;
}
void MySlider::set_max_value(double value) {
    max_value = value;
    update_log_data();
}
MySlider::MySlider() {
    min_value = 0;
    max_value = 1;
    value = 0;
    text_valid = false;
    text_editing = false;
    update_occurring = false;
    prefix = "";
    suffix = "";
    digits_after_decimal = 0;
    prefix_label.set_css_classes({"prefix-label"});
    prefix_label.insert_at_end(*this);
    value_label.set_css_classes({"value-label"});
    value_label.insert_at_end(*this);
    slider.set_css_classes({"imprecise-slider"});
    text_entry.set_css_classes({"precise-number-editor"});
    slider.set_hexpand();
    slider.set_size_request(100);
    text_entry.set_hexpand();
    text_entry.insert_at_end(*this);
    suffix_label.set_css_classes({"suffix-label"});
    suffix_label.insert_at_end(*this);
    slider.insert_at_end(*this);
    edit_btn.insert_at_end(*this);
    edit_btn.set_css_classes({"edit-btn"});
    edit_btn.signal_clicked().connect([this]() {
        update();
        text_editing = !text_editing;
        update();
    });
    text_entry.property_width_chars().set_value(0);
    text_entry.signal_changed().connect([this]() {
        try {
            value = std::stod(text_entry.get_text().c_str());
            text_valid = true;
        } catch(std::out_of_range) {
            text_valid = false;
        } catch (std::invalid_argument) {
            text_valid = false;
        }
        if (text_valid) {
            value_changed.emit(value);
        }
        update();
    });
    slider.signal_value_changed().connect([this]() {
        if (get_logarithmic()) {
            value = unscale_log(slider.get_value());
        } else {
            value = slider.get_value();
        }
        value_changed.emit(value);
        update();
    });
    update(true);
}