/*
 * config.c - configuration management
 *
 * Copyright © 2007 Julien Danjou <julien@danjou.info>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 */


/**
 * \defgroup ui_callback
 */

#include <confuse.h>
#include <X11/keysym.h>

#include "awesome.h"
#include "layout.h"
#include "tag.h"
#include "draw.h"
#include "util.h"
#include "statusbar.h"
#include "screen.h"
#include "layouts/tile.h"
#include "layouts/max.h"
#include "layouts/floating.h"

static XColor initxcolor(Display *, int, const char *);
static unsigned int get_numlockmask(Display *);

/** Link a name to a function */
typedef struct
{
    const char *name;
    void *func;
} NameFuncLink;

/** Link a name to a key symbol */
typedef struct
{
    const char *name;
    KeySym keysym;
} KeyMod;

/** List of keyname and corresponding X11 mask codes */
static const KeyMod KeyModList[] =
{
    {"Shift", ShiftMask},
    {"Lock", LockMask},
    {"Control", ControlMask},
    {"Mod1", Mod1Mask},
    {"Mod2", Mod2Mask},
    {"Mod3", Mod3Mask},
    {"Mod4", Mod4Mask},
    {"Mod5", Mod5Mask},
    {"None", 0}
};

/** List of available layouts and link between name and functions */
static const NameFuncLink LayoutsList[] =
{
    {"tile", layout_tile},
    {"tileleft", layout_tileleft},
    {"max", layout_max},
    {"floating", layout_floating},
    {NULL, NULL}
};

/** List of available UI bindable callbacks and functions */
static const NameFuncLink KeyfuncList[] = {
    /* util.c */
    {"spawn", uicb_spawn},
    {"exec", uicb_exec},
    /* client.c */
    {"killclient", uicb_killclient},
    {"moveresize", uicb_moveresize},
    {"settrans", uicb_settrans},
    {"setborder", uicb_setborder},
    {"swapnext", uicb_swapnext},
    {"swapprev", uicb_swapprev},
    /* tag.c */
    {"tag", uicb_tag},
    {"togglefloating", uicb_togglefloating},
    {"toggleview", uicb_toggleview},
    {"toggletag", uicb_toggletag},
    {"view", uicb_view},
    {"view_tag_prev_selected", uicb_tag_prev_selected},
    {"view_tag_previous", uicb_tag_viewprev},
    {"view_tag_next", uicb_tag_viewnext},
    /* layout.c */
    {"setlayout", uicb_setlayout},
    {"focusnext", uicb_focusnext},
    {"focusprev", uicb_focusprev},
    {"togglemax", uicb_togglemax},
    {"toggleverticalmax", uicb_toggleverticalmax},
    {"togglehorizontalmax", uicb_togglehorizontalmax},
    {"zoom", uicb_zoom},
    /* layouts/tile.c */
    {"setmwfact", uicb_setmwfact},
    {"setnmaster", uicb_setnmaster},
    {"setncol", uicb_setncol},
    /* screen.c */
    {"focusnextscreen", uicb_focusnextscreen},
    {"focusprevscreen", uicb_focusprevscreen},
    {"movetoscreen", uicb_movetoscreen},
    /* awesome.c */
    {"quit", uicb_quit},
    /* statusbar.c */
    {"togglebar", uicb_togglebar},
    {NULL, NULL}
};

/** Lookup for a key mask from its name
 * \param keyname Key name
 * \return Key mask or 0 if not found
 */
static KeySym
key_mask_lookup(const char *keyname)
{
    int i;

    if(keyname)
        for(i = 0; KeyModList[i].name; i++)
            if(!a_strcmp(keyname, KeyModList[i].name))
                return KeyModList[i].keysym;

    return 0;
}

/** Lookup for a function pointer from its name
 * in the given NameFuncLink list
 * \param funcname Function name
 * \param list Function and name link list
 * \return function pointer
 */
static void *
name_func_lookup(const char *funcname, const NameFuncLink * list)
{
    int i;

    if(funcname && list)
        for(i = 0; list[i].name; i++)
            if(!a_strcmp(funcname, list[i].name))
                return list[i].func;

    return NULL;
}

/** Parse configuration file and initialize some stuff
 * \param disp Display ref
 * \param scr Screen number
 * \param drawcontext Draw context
 */
void
parse_config(Display * disp, int scr, DC * drawcontext, const char *confpatharg, awesome_config *awesomeconf)
{
    static cfg_opt_t general_opts[] =
    {
        CFG_INT((char *) "border", 1, CFGF_NONE),
        CFG_INT((char *) "snap", 8, CFGF_NONE),
        CFG_BOOL((char *) "resize_hints", cfg_false, CFGF_NONE),
        CFG_INT((char *) "opacity_unfocused", 100, CFGF_NONE),
        CFG_BOOL((char *) "focus_move_pointer", cfg_false, CFGF_NONE),
        CFG_STR((char *) "font", (char *) "mono-12", CFGF_NONE),
        CFG_END()
    };
    static cfg_opt_t colors_opts[] =
    {
        CFG_STR((char *) "normal_border", (char *) "#111111", CFGF_NONE),
        CFG_STR((char *) "normal_bg", (char *) "#111111", CFGF_NONE),
        CFG_STR((char *) "normal_fg", (char *) "#eeeeee", CFGF_NONE),
        CFG_STR((char *) "focus_border", (char *) "#6666ff", CFGF_NONE),
        CFG_STR((char *) "focus_bg", (char *) "#6666ff", CFGF_NONE),
        CFG_STR((char *) "focus_fg", (char *) "#ffffff", CFGF_NONE),
        CFG_END()
    };
    static cfg_opt_t statusbar_opts[] =
    {
        CFG_STR((char *) "position", (char *) "top", CFGF_NONE),
        CFG_END()
    };
    static cfg_opt_t tag_opts[] =
    {
        CFG_STR((char *) "layout", (char *) "tile", CFGF_NONE),
        CFG_END()
    };
    static cfg_opt_t tags_opts[] =
    {
        CFG_SEC((char *) "tag", tag_opts, CFGF_TITLE | CFGF_MULTI),
        CFG_END()
    };
    static cfg_opt_t layout_opts[] =
    {
        CFG_STR((char *) "symbol", (char *) "???", CFGF_NONE),
        CFG_END()
    };
    static cfg_opt_t layouts_opts[] =
    {
        CFG_SEC((char *) "layout", layout_opts, CFGF_TITLE | CFGF_MULTI),
        CFG_FLOAT((char *) "mwfact", 0.5, CFGF_NONE),
        CFG_INT((char *) "nmaster", 1, CFGF_NONE),
        CFG_INT((char *) "ncol", 1, CFGF_NONE),
        CFG_END()
    };
    static cfg_opt_t rule_opts[] =
    {
        CFG_STR((char *) "name", (char *) "", CFGF_NONE),
        CFG_STR((char *) "tags", (char *) "", CFGF_NONE),
        CFG_BOOL((char *) "float", cfg_false, CFGF_NONE),
        CFG_END()
    };
    static cfg_opt_t rules_opts[] =
    {
        CFG_SEC((char *) "rule", rule_opts, CFGF_MULTI),
        CFG_END()
    };
    static cfg_opt_t key_opts[] =
    {
        CFG_STR_LIST((char *) "modkey", (char *) "{Mod4}", CFGF_NONE),
        CFG_STR((char *) "key", (char *) "None", CFGF_NONE),
        CFG_STR((char *) "command", (char *) "", CFGF_NONE),
        CFG_STR((char *) "arg", NULL, CFGF_NONE),
        CFG_END()
    };
    static cfg_opt_t keys_opts[] =
    {
        CFG_STR((char *) "modkey", (char *) "Mod4", CFGF_NONE),
        CFG_SEC((char *) "key", key_opts, CFGF_MULTI),
        CFG_END()
    };
    static cfg_opt_t opts[] =
    {
        CFG_SEC((char *) "general", general_opts, CFGF_NONE),
        CFG_SEC((char *) "colors", colors_opts, CFGF_NONE),
        CFG_SEC((char *) "statusbar", statusbar_opts, CFGF_NONE),
        CFG_SEC((char *) "tags", tags_opts, CFGF_NONE),
        CFG_SEC((char *) "layouts", layouts_opts, CFGF_NONE),
        CFG_SEC((char *) "rules", rules_opts, CFGF_NONE),
        CFG_SEC((char *) "keys", keys_opts, CFGF_NONE),
        CFG_END()
    };
    cfg_t *cfg, *cfg_general, *cfg_colors, *cfg_statusbar,
          *cfg_tags, *cfg_layouts, *cfg_rules, *cfg_keys, *cfgsectmp;
    int i = 0;
    unsigned int j = 0;
    const char *tmp, *homedir;
    char *confpath;
    KeySym tmp_key;
    ssize_t confpath_len;
    XColor colorbuf;

    if(confpatharg)
        confpath = a_strdup(confpatharg);
    else
    {
        homedir = getenv("HOME");
        confpath_len = a_strlen(homedir) + a_strlen(AWESOME_CONFIG_FILE) + 2;
        confpath = p_new(char, confpath_len);
        a_strcpy(confpath, confpath_len, homedir);
        a_strcat(confpath, confpath_len, "/");
        a_strcat(confpath, confpath_len, AWESOME_CONFIG_FILE);
    }

    a_strcpy(awesomeconf->statustext, sizeof(awesomeconf->statustext), "awesome-" VERSION);

    /* store display */
    awesomeconf->display = disp;

    /* set screen */
    awesomeconf->screen = scr;
    awesomeconf->phys_screen = get_phys_screen(disp, scr);

    cfg = cfg_init(opts, CFGF_NONE);

    if(cfg_parse(cfg, confpath) == CFG_PARSE_ERROR)
        fprintf(stderr, "awesome: error parsing configuration file\n");

    cfg_general = cfg_getsec(cfg, "general");
    cfg_colors = cfg_getsec(cfg, "colors");
    cfg_statusbar = cfg_getsec(cfg, "statusbar");
    cfg_tags = cfg_getsec(cfg, "tags");
    cfg_layouts = cfg_getsec(cfg, "layouts");
    cfg_rules = cfg_getsec(cfg, "rules");
    cfg_keys = cfg_getsec(cfg, "keys");

    /* General section */

    awesomeconf->borderpx = cfg_getint(cfg_general, "border");
    awesomeconf->snap = cfg_getint(cfg_general, "snap");
    awesomeconf->resize_hints = cfg_getbool(cfg_general, "resize_hints");
    awesomeconf->opacity_unfocused = cfg_getint(cfg_general, "opacity_unfocused");
    awesomeconf->focus_move_pointer = cfg_getbool(cfg_general, "focus_move_pointer");
    drawcontext->font = XftFontOpenName(disp, awesomeconf->phys_screen, cfg_getstr(cfg_general, "font"));
    if(!drawcontext->font)
        eprint("awesome: cannot init font\n");

    /* Colors */
    drawcontext->norm[ColBorder] = initxcolor(disp, awesomeconf->phys_screen,
                                              cfg_getstr(cfg_colors, "normal_border")).pixel;
    drawcontext->norm[ColBG] = initxcolor(disp, awesomeconf->phys_screen,
                                          cfg_getstr(cfg_colors, "normal_bg")).pixel;
    drawcontext->sel[ColBorder] = initxcolor(disp, awesomeconf->phys_screen,
                                             cfg_getstr(cfg_colors, "focus_border")).pixel;
    drawcontext->sel[ColBG] = initxcolor(disp, awesomeconf->phys_screen,
                                         cfg_getstr(cfg_colors, "focus_bg")).pixel;

    colorbuf = initxcolor(disp, awesomeconf->phys_screen, cfg_getstr(cfg_colors, "normal_fg"));
    drawcontext->norm[ColFG] = colorbuf.pixel;
    drawcontext->text_normal = colorbuf;
    colorbuf = initxcolor(disp, awesomeconf->phys_screen, cfg_getstr(cfg_colors, "focus_fg"));
    drawcontext->sel[ColFG] = colorbuf.pixel;
    drawcontext->text_selected = colorbuf;

    /* Statusbar */
    tmp = cfg_getstr(cfg_statusbar, "position");

    if(tmp && !a_strncmp(tmp, "off", 6))
        awesomeconf->statusbar_default_position = BarOff;
    else if(tmp && !a_strncmp(tmp, "bottom", 6))
        awesomeconf->statusbar_default_position = BarBot;
    else
        awesomeconf->statusbar_default_position = BarTop;

    awesomeconf->statusbar.position = awesomeconf->statusbar_default_position;

    /* Layouts */

    awesomeconf->nlayouts = cfg_size(cfg_layouts, "layout");
    awesomeconf->layouts = p_new(Layout, awesomeconf->nlayouts);
    for(i = 0; i < awesomeconf->nlayouts; i++)
    {
        cfgsectmp = cfg_getnsec(cfg_layouts, "layout", i);
        awesomeconf->layouts[i].arrange = name_func_lookup(cfg_title(cfgsectmp), LayoutsList);
        if(!awesomeconf->layouts[i].arrange)
        {
            fprintf(stderr, "awesome: unknown layout #%d in configuration file\n", i);
            awesomeconf->layouts[i].symbol = NULL;
            continue;
        }
        awesomeconf->layouts[i].symbol = a_strdup(cfg_getstr(cfgsectmp, "symbol"));
    }

    awesomeconf->mwfact = cfg_getfloat(cfg_layouts, "mwfact");
    awesomeconf->nmaster = cfg_getint(cfg_layouts, "nmaster");
    awesomeconf->ncol = cfg_getint(cfg_layouts, "ncol");

    awesomeconf->current_layout = awesomeconf->layouts;

    if(!awesomeconf->nlayouts || !awesomeconf->current_layout->arrange)
        eprint("awesome: fatal: no default layout available\n");

    /* Rules */

    awesomeconf->nrules = cfg_size(cfg_rules, "rule");
    awesomeconf->rules = p_new(Rule, awesomeconf->nrules);
    for(i = 0; i < awesomeconf->nrules; i++)
    {
        cfgsectmp = cfg_getnsec(cfg_rules, "rule", i);
        awesomeconf->rules[i].prop = a_strdup(cfg_getstr(cfgsectmp, "name"));
        awesomeconf->rules[i].tags = a_strdup(cfg_getstr(cfgsectmp, "tags"));
        if(!a_strlen(awesomeconf->rules[i].tags))
            awesomeconf->rules[i].tags = NULL;
        awesomeconf->rules[i].isfloating = cfg_getbool(cfgsectmp, "float");
    }

    /* Tags */

    awesomeconf->ntags = cfg_size(cfg_tags, "tag");
    awesomeconf->tags = p_new(Tag, awesomeconf->ntags);
    for(i = 0; i < awesomeconf->ntags; i++)
    {
        cfgsectmp = cfg_getnsec(cfg_tags, "tag", i);
        awesomeconf->tags[i].name = a_strdup(cfg_title(cfgsectmp));
        awesomeconf->tags[i].selected = False;
        awesomeconf->tags[i].was_selected = False;
        awesomeconf->tags[i].layout = awesomeconf->layouts;
    }

    if(!awesomeconf->ntags)
        eprint("awesome: fatal: no tags found in configuration file\n");

    /* select first tag by default */
    awesomeconf->tags[0].selected = True;
    awesomeconf->tags[0].was_selected = True;

    /* Keys */
    tmp_key = key_mask_lookup(cfg_getstr(cfg_keys, "modkey"));
    awesomeconf->modkey = tmp_key ? tmp_key : Mod4Mask;
    awesomeconf->numlockmask = get_numlockmask(disp);

    awesomeconf->nkeys = cfg_size(cfg_keys, "key");
    awesomeconf->keys = p_new(Key, awesomeconf->nkeys);
    for(i = 0; i < awesomeconf->nkeys; i++)
    {
        cfgsectmp = cfg_getnsec(cfg_keys, "key", i);
        for(j = 0; j < cfg_size(cfgsectmp, "modkey"); j++)
            awesomeconf->keys[i].mod |= key_mask_lookup(cfg_getnstr(cfgsectmp, "modkey", j));
        awesomeconf->keys[i].keysym = XStringToKeysym(cfg_getstr(cfgsectmp, "key"));
        awesomeconf->keys[i].func = name_func_lookup(cfg_getstr(cfgsectmp, "command"), KeyfuncList);
        awesomeconf->keys[i].arg = a_strdup(cfg_getstr(cfgsectmp, "arg"));
    }

    /* Free! Like a river! */
    cfg_free(cfg);
    p_delete(&confpath);
}

static unsigned int
get_numlockmask(Display *disp)
{
    XModifierKeymap *modmap;
    unsigned int mask = 0;
    int i, j;

    modmap = XGetModifierMapping(disp);
    for(i = 0; i < 8; i++)
        for(j = 0; j < modmap->max_keypermod; j++)
        {
            if(modmap->modifiermap[i * modmap->max_keypermod + j]
               == XKeysymToKeycode(disp, XK_Num_Lock))
                mask = (1 << i);
        }

    XFreeModifiermap(modmap);

    return mask;
}

/** Initialize color from X side
 * \param colorstr Color code
 * \param disp Display ref
 * \param scr Screen number
 * \return XColor pixel
 */
static XColor
initxcolor(Display *disp, int scr, const char *colstr)
{
    XColor color;
    if(!XAllocNamedColor(disp, DefaultColormap(disp, scr), colstr, &color, &color))
        die("awesome: error, cannot allocate color '%s'\n", colstr);
    return color;
}