/*
 * vim:ts=4:sw=4:expandtab
 *
 */
#include <yajl/yajl_common.h>
#include <yajl/yajl_gen.h>
#include <yajl/yajl_parse.h>

#include "all.h"

/* TODO: refactor the whole parsing thing */

static char *last_key;
static Con *json_node;
static Con *to_focus;
static bool parsing_swallows;
static bool parsing_rect;
static bool parsing_window_rect;
static bool parsing_geometry;
struct Match *current_swallow;

static int json_start_map(void *ctx) {
    LOG("start of map, last_key = %s\n", last_key);
    if (parsing_swallows) {
        LOG("TODO: create new swallow\n");
        current_swallow = smalloc(sizeof(Match));
        match_init(current_swallow);
        TAILQ_INSERT_TAIL(&(json_node->swallow_head), current_swallow, matches);
    } else {
        if (!parsing_rect && !parsing_window_rect && !parsing_geometry) {
            if (last_key && strcasecmp(last_key, "floating_nodes") == 0) {
                Con *ws = con_get_workspace(json_node);
                json_node = con_new(NULL);
                json_node->parent = ws;
                TAILQ_INSERT_TAIL(&(ws->floating_head), json_node, floating_windows);
                TAILQ_INSERT_TAIL(&(ws->focus_head), json_node, focused);
            } else {
                Con *parent = json_node;
                json_node = con_new(NULL);
                json_node->parent = parent;
            }
        }
    }
    return 1;
}

static int json_end_map(void *ctx) {
    LOG("end of map\n");
    if (!parsing_swallows && !parsing_rect && !parsing_window_rect && !parsing_geometry) {
        LOG("attaching\n");
        con_attach(json_node, json_node->parent, false);
        json_node = json_node->parent;
    }
    if (parsing_rect)
        parsing_rect = false;
    if (parsing_window_rect)
        parsing_window_rect = false;
    if (parsing_geometry)
        parsing_geometry = false;
    return 1;
}

static int json_end_array(void *ctx) {
    LOG("end of array\n");
    parsing_swallows = false;
    return 1;
}

static int json_key(void *ctx, const unsigned char *val, unsigned int len) {
    LOG("key: %.*s\n", len, val);
    FREE(last_key);
    last_key = scalloc((len+1) * sizeof(char));
    memcpy(last_key, val, len);
    if (strcasecmp(last_key, "swallows") == 0) {
        parsing_swallows = true;
    }
    if (strcasecmp(last_key, "rect") == 0)
        parsing_rect = true;
    if (strcasecmp(last_key, "window_rect") == 0)
        parsing_window_rect = true;
    if (strcasecmp(last_key, "geometry") == 0)
        parsing_geometry = true;
    return 1;
}

static int json_string(void *ctx, const unsigned char *val, unsigned int len) {
    LOG("string: %.*s for key %s\n", len, val, last_key);
    if (parsing_swallows) {
        /* TODO: the other swallowing keys */
        if (strcasecmp(last_key, "class") == 0) {
            current_swallow->class = scalloc((len+1) * sizeof(char));
            memcpy(current_swallow->class, val, len);
        }
        LOG("unhandled yet: swallow\n");
    } else {
        if (strcasecmp(last_key, "name") == 0) {
            json_node->name = scalloc((len+1) * sizeof(char));
            memcpy(json_node->name, val, len);
        } else if (strcasecmp(last_key, "sticky_group") == 0) {
            json_node->sticky_group = scalloc((len+1) * sizeof(char));
            memcpy(json_node->sticky_group, val, len);
            LOG("sticky_group of this container is %s\n", json_node->sticky_group);
        } else if (strcasecmp(last_key, "orientation") == 0) {
            char *buf = NULL;
            asprintf(&buf, "%.*s", len, val);
            if (strcasecmp(buf, "none") == 0)
                json_node->orientation = NO_ORIENTATION;
            else if (strcasecmp(buf, "horizontal") == 0)
                json_node->orientation = HORIZ;
            else if (strcasecmp(buf, "vertical") == 0)
                json_node->orientation = VERT;
            else LOG("Unhandled orientation: %s\n", buf);
            free(buf);
        }
    }
    return 1;
}

static int json_int(void *ctx, long val) {
    LOG("int %d for key %s\n", val, last_key);
    if (strcasecmp(last_key, "layout") == 0) {
        json_node->layout = val;
    }
    if (strcasecmp(last_key, "type") == 0) {
        json_node->type = val;
    }
    if (strcasecmp(last_key, "fullscreen_mode") == 0) {
        json_node->fullscreen_mode = val;
    }
    if (strcasecmp(last_key, "focused") == 0 && val == 1) {
        to_focus = json_node;
    }

    if (strcasecmp(last_key, "num") == 0)
        json_node->num = val;

    if (parsing_rect || parsing_window_rect || parsing_geometry) {
        Rect *r;
        if (parsing_rect)
            r = &(json_node->rect);
        else if (parsing_window_rect)
            r = &(json_node->window_rect);
        else r = &(json_node->geometry);
        if (strcasecmp(last_key, "x") == 0)
            r->x = val;
        else if (strcasecmp(last_key, "y") == 0)
            r->y = val;
        else if (strcasecmp(last_key, "width") == 0)
            r->width = val;
        else if (strcasecmp(last_key, "height") == 0)
            r->height = val;
        else printf("WARNING: unknown key %s in rect\n", last_key);
        printf("rect now: (%d, %d, %d, %d)\n",
                r->x, r->y, r->width, r->height);
    }
    if (parsing_swallows) {
        if (strcasecmp(last_key, "id") == 0) {
            current_swallow->id = val;
        }
        if (strcasecmp(last_key, "dock") == 0) {
            current_swallow->dock = val;
        }
        if (strcasecmp(last_key, "insert_where") == 0) {
            current_swallow->insert_where = val;
        }
    }

    return 1;
}

static int json_double(void *ctx, double val) {
    LOG("double %f for key %s\n", val, last_key);
    if (strcasecmp(last_key, "percent") == 0) {
        json_node->percent = val;
    }
    return 1;
}

void tree_append_json(const char *filename) {
    /* TODO: percent of other windows are not correctly fixed at the moment */
    FILE *f;
    if ((f = fopen(filename, "r")) == NULL) {
        LOG("Cannot open file\n");
        return;
    }
    char *buf = malloc(65535); /* TODO */
    int n = fread(buf, 1, 65535, f);
    LOG("read %d bytes\n", n);
    yajl_gen g;
    yajl_handle hand;
    yajl_callbacks callbacks;
    memset(&callbacks, '\0', sizeof(yajl_callbacks));
    callbacks.yajl_start_map = json_start_map;
    callbacks.yajl_end_map = json_end_map;
    callbacks.yajl_end_array = json_end_array;
    callbacks.yajl_string = json_string;
    callbacks.yajl_map_key = json_key;
    callbacks.yajl_integer = json_int;
    callbacks.yajl_double = json_double;
    g = yajl_gen_alloc(NULL, NULL);
    hand = yajl_alloc(&callbacks, NULL, NULL, (void*)g);
    yajl_status stat;
    json_node = focused;
    to_focus = NULL;
    parsing_rect = false;
    parsing_window_rect = false;
    parsing_geometry = false;
    setlocale(LC_NUMERIC, "C");
    stat = yajl_parse(hand, (const unsigned char*)buf, n);
    if (stat != yajl_status_ok &&
        stat != yajl_status_insufficient_data)
    {
        unsigned char * str = yajl_get_error(hand, 1, (const unsigned char*)buf, n);
        fprintf(stderr, "%s\n", (const char *) str);
        yajl_free_error(hand, str);
    }

    setlocale(LC_NUMERIC, "");
    yajl_parse_complete(hand);

    fclose(f);
    if (to_focus)
        con_focus(to_focus);
}