#include "config.h"

#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <assert.h>

#include "color.h"

#include "decoration.h"
#include "decorations/background.h"
#include "decorations/stack.h"
#include "decorations/underline.h"

#include "particle.h"
#include "particles/empty.h"
#include "particles/list.h"
#include "particles/map.h"
#include "particles/progress_bar.h"
#include "particles/ramp.h"
#include "particles/string.h"

#include "module.h"
#include "modules/backlight/backlight.h"
#include "modules/battery/battery.h"
#include "modules/clock/clock.h"
#include "modules/i3/i3.h"
#include "modules/label/label.h"
#include "modules/mpd/mpd.h"
#include "modules/xkb/xkb.h"
#include "modules/xwindow/xwindow.h"

static uint8_t
hex_nibble(char hex)
{
    assert((hex >= '0' && hex <= '9') ||
           (hex >= 'a' && hex <= 'f') ||
           (hex >= 'A' && hex <= 'F'));

    if (hex >= '0' && hex <= '9')
        return hex - '0';
    else if (hex >= 'a' && hex <= 'f')
        return hex - 'a' + 10;
    else
        return hex - 'A' + 10;
}

static uint8_t
hex_byte(const char hex[2])
{
    uint8_t upper = hex_nibble(hex[0]);
    uint8_t lower = hex_nibble(hex[1]);
    return upper << 4 | lower;
}

static struct rgba
color_from_hexstr(const char *hex)
{
    assert(strlen(hex) == 8);
    uint8_t red = hex_byte(&hex[0]);
    uint8_t green = hex_byte(&hex[2]);
    uint8_t blue = hex_byte(&hex[4]);
    uint8_t alpha = hex_byte(&hex[6]);

    struct rgba rgba = {
        (double)red / 255.0,
        (double)green / 255.0,
        (double)blue / 255.0,
        (double)alpha / 255.0
    };

    assert(rgba.red >= 0.0 && rgba.red <= 1.0);
    assert(rgba.green >= 0.0 && rgba.green <= 1.0);
    assert(rgba.blue >= 0.0 && rgba.blue <= 1.0);
    assert(rgba.alpha >= 0.0 && rgba.alpha <= 1.0);

    return rgba;
}

static struct font *
font_from_config(const struct yml_node *node)
{
    const struct yml_node *family = yml_get_value(node, "family");
    const struct yml_node *size = yml_get_value(node, "size");
    const struct yml_node *italic = yml_get_value(node, "italic");
    const struct yml_node *bold = yml_get_value(node, "bold");
    const struct yml_node *y_offset = yml_get_value(node, "y_offset");

    return font_new(
        family != NULL ? yml_value_as_string(family) : "monospace",
        size != NULL ? yml_value_as_int(size) : 12,
        italic != NULL ? yml_value_as_bool(italic) : false,
        bold != NULL ? yml_value_as_bool(bold) : false,
        y_offset != NULL ? yml_value_as_int(y_offset) : 0);
}

static struct deco *
deco_background_from_config(const struct yml_node *node)
{
    assert(yml_is_dict(node));

    const struct yml_node *color = yml_get_value(node, "color");
    assert(yml_is_scalar(color));

    return deco_background(color_from_hexstr(yml_value_as_string(color)));
}

static struct deco *
deco_underline_from_config(const struct yml_node *node)
{
    assert(yml_is_dict(node));

    const struct yml_node *size = yml_get_value(node, "size");
    const struct yml_node *color = yml_get_value(node, "color");
    assert(yml_is_scalar(size));
    assert(yml_is_scalar(color));

    return deco_underline(
        yml_value_as_int(size), color_from_hexstr(yml_value_as_string(color)));
}

static struct deco *deco_from_config(const struct yml_node *node);

static struct deco *
deco_stack_from_config(const struct yml_node *node)
{
    assert(yml_is_list(node));

    size_t count = yml_list_length(node);
    assert(count > 0);

    struct deco *decos[count];
    size_t idx = 0;

    for (struct yml_list_iter it = yml_list_iter(node);
         it.node != NULL;
         yml_list_next(&it), idx++)
    {
        decos[idx] = deco_from_config(it.node);
    }

    return deco_stack(decos, count);
}

static struct deco *
deco_from_config(const struct yml_node *node)
{
    assert(yml_is_dict(node));
    assert(yml_dict_length(node) == 1);

    struct yml_dict_iter it = yml_dict_iter(node);
    const struct yml_node *deco_type = it.key;
    const struct yml_node *deco_data = it.value;

    assert(yml_is_scalar(deco_type));

    const char *type = yml_value_as_string(deco_type);

    if (strcmp(type, "background") == 0)
        return deco_background_from_config(deco_data);
    else if (strcmp(type, "underline") == 0)
        return deco_underline_from_config(deco_data);
    else if (strcmp(type, "stack") == 0)
        return deco_stack_from_config(deco_data);
    else
        assert(false);
}

static struct particle *
particle_empty_from_config(const struct yml_node *node,
                           const struct font *parent_font)
{
    const struct yml_node *left_margin = yml_get_value(node, "left_margin");
    const struct yml_node *right_margin = yml_get_value(node, "right_margin");

    assert(left_margin == NULL || yml_is_scalar(left_margin));
    assert(right_margin == NULL || yml_is_scalar(right_margin));

    return particle_empty_new(
        left_margin != NULL ? yml_value_as_int(left_margin) : 0,
        right_margin != NULL ? yml_value_as_int(right_margin) : 0);
}

static struct particle *
particle_string_from_config(const struct yml_node *node,
                            const struct font *parent_font)
{
    assert(yml_is_dict(node));

    const struct yml_node *text = yml_get_value(node, "text");
    const struct yml_node *font = yml_get_value(node, "font");
    const struct yml_node *foreground = yml_get_value(node, "foreground");
    const struct yml_node *margin = yml_get_value(node, "margin");
    const struct yml_node *left_margin = yml_get_value(node, "left_margin");
    const struct yml_node *right_margin = yml_get_value(node, "right_margin");
    const struct yml_node *on_click = yml_get_value(node, "on_click");

    assert(text != NULL && yml_is_scalar(text));

    struct rgba fg_color = foreground != NULL
        ? color_from_hexstr(yml_value_as_string(foreground)) :
        (struct rgba){1.0, 1.0, 1.0, 1.0};

    int left = margin != NULL ? yml_value_as_int(margin) :
        left_margin != NULL ? yml_value_as_int(left_margin) : 0;
    int right = margin != NULL ? yml_value_as_int(margin) :
        right_margin != NULL ? yml_value_as_int(right_margin) : 0;

    return particle_string_new(
        yml_value_as_string(text),
        font != NULL ? font_from_config(font) : font_clone(parent_font),
        fg_color, left, right,
        on_click != NULL ? yml_value_as_string(on_click) : NULL);
}

static struct particle * particle_from_config(
    const struct yml_node *node, const struct font *parent_font);

static struct particle *
particle_list_from_config(const struct yml_node *node,
                          const struct font *parent_font)
{
    const struct yml_node *items_node = yml_get_value(node, "items");

    const struct yml_node *margin_node = yml_get_value(node, "margin");
    const struct yml_node *left_margin_node = yml_get_value(node, "left_margin");
    const struct yml_node *right_margin_node = yml_get_value(node, "right_margin");

    const struct yml_node *spacing_node = yml_get_value(node, "spacing");
    const struct yml_node *left_spacing_node = yml_get_value(node, "left_spacing");
    const struct yml_node *right_spacing_node = yml_get_value(node, "right_spacing");

    int left_margin = 0;
    int right_margin = 0;
    int left_spacing = 0;
    int right_spacing = 2;

    if (margin_node != NULL)
        left_margin = right_margin = yml_value_as_int(margin_node);
    if (left_margin_node != NULL)
        left_margin = yml_value_as_int(left_margin_node);
    if (right_margin_node != NULL)
        right_margin = yml_value_as_int(right_margin_node);

    if (spacing_node != NULL)
        left_spacing = right_spacing = yml_value_as_int(spacing_node);
    if (left_spacing_node != NULL)
        left_spacing = yml_value_as_int(left_spacing_node);
    if (right_spacing_node != NULL)
        right_spacing = yml_value_as_int(right_spacing_node);

    size_t count = yml_list_length(items_node);
    struct particle *parts[count];

    size_t idx = 0;
    for (struct yml_list_iter it = yml_list_iter(items_node);
         it.node != NULL;
         yml_list_next(&it), idx++)
    {
        parts[idx] = particle_from_config(it.node, parent_font);
    }

    return particle_list_new(
        parts, count, left_spacing, right_spacing, left_margin, right_margin);
}

static struct particle *
particle_map_from_config(const struct yml_node *node, const struct font *parent_font)
{
    const struct yml_node *tag = yml_get_value(node, "tag");
    const struct yml_node *values = yml_get_value(node, "values");
    const struct yml_node *def = yml_get_value(node, "default");

    assert(yml_is_scalar(tag));
    assert(yml_is_dict(values));

    struct particle_map particle_map[yml_dict_length(values)];

    size_t idx = 0;
    for (struct yml_dict_iter it = yml_dict_iter(values);
         it.key != NULL;
         yml_dict_next(&it), idx++)
    {
        particle_map[idx].tag_value = yml_value_as_string(it.key);
        particle_map[idx].particle = particle_from_config(it.value, parent_font);
        assert(particle_map[idx].particle != NULL);
    }

    struct particle *default_particle = def != NULL
        ? particle_from_config(def, parent_font)
        : NULL;

    return particle_map_new(
        yml_value_as_string(tag), particle_map, yml_dict_length(values),
        default_particle);
}

static struct particle *
particle_ramp_from_config(const struct yml_node *node, const struct font *parent_font)
{
    const struct yml_node *tag = yml_get_value(node, "tag");
    const struct yml_node *items = yml_get_value(node, "items");

    assert(yml_is_scalar(tag));
    assert(yml_is_list(items));

    size_t count = yml_list_length(items);
    struct particle *parts[count];

    size_t idx = 0;
    for (struct yml_list_iter it = yml_list_iter(items);
         it.node != NULL;
         yml_list_next(&it), idx++)
    {
        parts[idx] = particle_from_config(it.node, parent_font);
    }

    return particle_ramp_new(yml_value_as_string(tag), parts, count);
}

static struct particle *
particle_progress_bar_from_config(const struct yml_node *node,
                                  const struct font *parent_font)
{
    const struct yml_node *tag = yml_get_value(node, "tag");
    const struct yml_node *length = yml_get_value(node, "length");
    const struct yml_node *start = yml_get_value(node, "start");
    const struct yml_node *end = yml_get_value(node, "end");
    const struct yml_node *fill = yml_get_value(node, "fill");
    const struct yml_node *empty = yml_get_value(node, "empty");
    const struct yml_node *indicator = yml_get_value(node, "indicator");
    const struct yml_node *left_margin = yml_get_value(node, "left_margin");
    const struct yml_node *right_margin = yml_get_value(node, "right_margin");

    assert(tag != NULL && yml_is_scalar(tag));
    assert(length != NULL && yml_is_scalar(length));
    assert(start != NULL);
    assert(end != NULL);
    assert(fill != NULL);
    assert(empty != NULL);
    assert(indicator != NULL);
    assert(left_margin == NULL || yml_is_scalar(left_margin));
    assert(right_margin == NULL || yml_is_scalar(right_margin));

    return particle_progress_bar_new(
        yml_value_as_string(tag),
        yml_value_as_int(length),
        particle_from_config(start, parent_font),
        particle_from_config(end, parent_font),
        particle_from_config(fill, parent_font),
        particle_from_config(empty, parent_font),
        particle_from_config(indicator, parent_font),
        left_margin != NULL ? yml_value_as_int(left_margin) : 0,
        right_margin != NULL ? yml_value_as_int(right_margin) : 0);
}

static struct particle *
particle_from_config(const struct yml_node *node, const struct font *parent_font)
{
    assert(yml_is_dict(node));
    assert(yml_dict_length(node) == 1);

    struct yml_dict_iter pair = yml_dict_iter(node);
    const char *type = yml_value_as_string(pair.key);

    struct particle *ret = NULL;
    if (strcmp(type, "empty") == 0)
        ret = particle_empty_from_config(pair.value, parent_font);
    else if (strcmp(type, "string") == 0)
        ret = particle_string_from_config(pair.value, parent_font);
    else if (strcmp(type, "list") == 0)
        ret = particle_list_from_config(pair.value, parent_font);
    else if (strcmp(type, "map") == 0)
        ret = particle_map_from_config(pair.value, parent_font);
    else if (strcmp(type, "ramp") == 0)
        ret = particle_ramp_from_config(pair.value, parent_font);
    else if (strcmp(type, "progress_bar") == 0)
        ret = particle_progress_bar_from_config(pair.value, parent_font);
    else
        assert(false);

    const struct yml_node *deco_node = yml_get_value(pair.value, "deco");
    assert(deco_node == NULL || yml_is_dict(deco_node));

    if (deco_node != NULL)
        ret->deco = deco_from_config(deco_node);

    return ret;
}

static struct module *
module_label_from_config(const struct yml_node *node, const struct font *parent_font)
{
    const struct yml_node *c = yml_get_value(node, "content");
    assert(c != NULL);
    return module_label(particle_from_config(c, parent_font));
}

static struct module *
module_clock_from_config(const struct yml_node *node, const struct font *parent_font)
{
    const struct yml_node *c = yml_get_value(node, "content");
    assert(c != NULL);
    return module_clock(particle_from_config(c, parent_font));
}

static struct module *
module_xwindow_from_config(const struct yml_node *node, const struct font *parent_font)
{
    const struct yml_node *c = yml_get_value(node, "content");
    assert(c != NULL);
    return module_xwindow(particle_from_config(c, parent_font));
}

static struct module *
module_i3_from_config(const struct yml_node *node, const struct font *parent_font)
{
    const struct yml_node *c = yml_get_value(node, "content");
    const struct yml_node *left_spacing = yml_get_value(node, "left_spacing");
    const struct yml_node *right_spacing = yml_get_value(node, "right_spacing");

    assert(yml_is_dict(c));
    assert(left_spacing == NULL || yml_is_scalar(left_spacing));
    assert(right_spacing == NULL || yml_is_scalar(right_spacing));

    struct i3_workspaces workspaces[yml_dict_length(c)];

    size_t idx = 0;
    for (struct yml_dict_iter it = yml_dict_iter(c);
         it.key != NULL;
         yml_dict_next(&it), idx++)
    {
        workspaces[idx].name = yml_value_as_string(it.key);
        workspaces[idx].content = particle_from_config(it.value, parent_font);
    }

    return module_i3(
        workspaces, yml_dict_length(c),
        left_spacing != NULL ? yml_value_as_int(left_spacing) : 0,
        right_spacing != NULL ? yml_value_as_int(right_spacing) : 0);
}

static struct module *
module_battery_from_config(const struct yml_node *node,
                           const struct font *parent_font)
{
    const struct yml_node *c = yml_get_value(node, "content");
    const struct yml_node *name = yml_get_value(node, "name");
    const struct yml_node *poll_interval = yml_get_value(node, "poll_interval");

    assert(yml_is_dict(c));
    assert(yml_is_scalar(name));
    assert(poll_interval == NULL || yml_is_scalar(poll_interval));

    return module_battery(
        yml_value_as_string(name),
        particle_from_config(c, parent_font),
        poll_interval != NULL ? yml_value_as_int(poll_interval) : 60);
}

static struct module *
module_xkb_from_config(const struct yml_node *node,
                       const struct font *parent_font)
{
    const struct yml_node *c = yml_get_value(node, "content");
    assert(yml_is_dict(c));

    return module_xkb(particle_from_config(c, parent_font));
}

static struct module *
module_backlight_from_config(const struct yml_node *node,
                             const struct font *parent_font)
{
    const struct yml_node *name = yml_get_value(node, "name");
    const struct yml_node *c = yml_get_value(node, "content");

    assert(yml_is_scalar(name));
    assert(yml_is_dict(c));

    return module_backlight(
        yml_value_as_string(name), particle_from_config(c, parent_font));
}

static struct module *
module_mpd_from_config(const struct yml_node *node,
                       const struct font *parent_font)
{
    const struct yml_node *host = yml_get_value(node, "host");
    const struct yml_node *port = yml_get_value(node, "port");
    const struct yml_node *c = yml_get_value(node, "content");

    assert(yml_is_scalar(host));
    assert(port == NULL || yml_is_scalar(port));
    assert(yml_is_dict(c));

    return module_mpd(
        yml_value_as_string(host),
        port != NULL ? yml_value_as_int(port) : 0,
        particle_from_config(c, parent_font));
}

struct bar *
conf_to_bar(const struct yml_node *bar)
{
    struct bar_config conf = {0};

    /* Create a default font */
    struct font *font = font_new("sans", 12, false, false, 0);

    const struct yml_node *height = yml_get_value(bar, "height");
    const struct yml_node *location = yml_get_value(bar, "location");
    const struct yml_node *background = yml_get_value(bar, "background");
    const struct yml_node *spacing = yml_get_value(bar, "spacing");
    const struct yml_node *left_spacing = yml_get_value(bar, "left_spacing");
    const struct yml_node *right_spacing = yml_get_value(bar, "right_spacing");
    const struct yml_node *margin = yml_get_value(bar, "margin");
    const struct yml_node *left_margin = yml_get_value(bar, "left_margin");
    const struct yml_node *right_margin = yml_get_value(bar, "right_margin");
    const struct yml_node *border = yml_get_value(bar, "border");
    const struct yml_node *font_node = yml_get_value(bar, "font");
    const struct yml_node *left = yml_get_value(bar, "left");
    const struct yml_node *center = yml_get_value(bar, "center");
    const struct yml_node *right = yml_get_value(bar, "right");

    if (height != NULL)
        conf.height = yml_value_as_int(height);

    if (location != NULL) {
        const char *loc = yml_value_as_string(location);
        assert(strcasecmp(loc, "top") == 0 || strcasecmp(loc, "bottom") == 0);

        if (strcasecmp(loc, "top") == 0)
            conf.location = BAR_TOP;
        else if (strcasecmp(loc, "bottom") == 0)
            conf.location = BAR_BOTTOM;
        else
            assert(false);
    }

    if (background != NULL)
        conf.background = color_from_hexstr(yml_value_as_string(background));

    if (spacing != NULL)
        conf.left_spacing = conf.right_spacing = yml_value_as_int(spacing);

    if (left_spacing != NULL)
        conf.left_spacing = yml_value_as_int(left_spacing);

    if (right_spacing != NULL)
        conf.right_spacing = yml_value_as_int(right_spacing);

    if (margin != NULL)
        conf.left_margin = conf.right_margin = yml_value_as_int(margin);

    if (left_margin != NULL)
        conf.left_margin = yml_value_as_int(left_margin);

    if (right_margin != NULL)
        conf.right_margin = yml_value_as_int(right_margin);

    if (border != NULL) {
        assert(yml_is_dict(border));

        const struct yml_node *width = yml_get_value(border, "width");
        const struct yml_node *color = yml_get_value(border, "color");

        if (width != NULL)
            conf.border.width = yml_value_as_int(width);

        if (color != NULL)
            conf.border.color = color_from_hexstr(yml_value_as_string(color));
    }

    if (font_node != NULL) {
        font_destroy(font);
        font = font_from_config(font_node);
    }

    for (size_t i = 0; i < 3; i++) {
        const struct yml_node *node = i == 0 ? left : i == 1 ? center : right;

        if (node != NULL) {
            const size_t count = yml_list_length(node);
            struct module **mods = calloc(count, sizeof(*mods));

            size_t idx = 0;
            for (struct yml_list_iter it = yml_list_iter(node);
                 it.node != NULL;
                 yml_list_next(&it), idx++)
            {
                const struct yml_node *n = yml_get_value(it.node, "module");

                assert(n != NULL);
                const char *mod_name = yml_value_as_string(n);

                if (strcmp(mod_name, "label") == 0)
                    mods[idx] = module_label_from_config(it.node, font);
                else if (strcmp(mod_name, "clock") == 0)
                    mods[idx] = module_clock_from_config(it.node, font);
                else if (strcmp(mod_name, "xwindow") == 0)
                    mods[idx] = module_xwindow_from_config(it.node, font);
                else if (strcmp(mod_name, "i3") == 0)
                    mods[idx] = module_i3_from_config(it.node, font);
                else if (strcmp(mod_name, "battery") == 0)
                    mods[idx] = module_battery_from_config(it.node, font);
                else if (strcmp(mod_name, "xkb") == 0)
                    mods[idx] = module_xkb_from_config(it.node, font);
                else if (strcmp(mod_name, "backlight") == 0)
                    mods[idx] = module_backlight_from_config(it.node, font);
                else if (strcmp(mod_name, "mpd") == 0)
                    mods[idx] = module_mpd_from_config(it.node, font);
                else
                    assert(false);
            }

            if (i == 0) {
                conf.left.mods = mods;
                conf.left.count = count;
            } else if (i == 1) {
                conf.center.mods = mods;
                conf.center.count = count;
            } else {
                conf.right.mods = mods;
                conf.right.count = count;
            }
        }
    }

    struct bar *ret = bar_new(&conf);

    free(conf.left.mods);
    free(conf.center.mods);
    free(conf.right.mods);
    font_destroy(font);

    return ret;
}