/*
 * vim:ts=4:sw=4:expandtab
 *
 * i3 - an improved dynamic tiling window manager
 * © 2009-2010 Michael Stapelberg and contributors (see also: LICENSE)
 *
 * workspace.c: Functions for modifying workspaces
 *
 */
#include <limits.h>

#include "all.h"

/*
 * Returns a pointer to the workspace with the given number (starting at 0),
 * creating the workspace if necessary (by allocating the necessary amount of
 * memory and initializing the data structures correctly).
 *
 */
Con *workspace_get(const char *num, bool *created) {
    Con *output, *workspace = NULL;

    TAILQ_FOREACH(output, &(croot->nodes_head), nodes)
        GREP_FIRST(workspace, output_get_content(output), !strcasecmp(child->name, num));

    if (workspace == NULL) {
        LOG("Creating new workspace \"%s\"\n", num);
        /* unless an assignment is found, we will create this workspace on the current output */
        output = con_get_output(focused);
        /* look for assignments */
        struct Workspace_Assignment *assignment;
        TAILQ_FOREACH(assignment, &ws_assignments, ws_assignments) {
            if (strcmp(assignment->name, num) != 0)
                continue;

            LOG("Found workspace assignment to output \"%s\"\n", assignment->output);
            GREP_FIRST(output, croot, !strcmp(child->name, assignment->output));
            break;
        }
        Con *content = output_get_content(output);
        LOG("got output %p with content %p\n", output, content);
        /* We need to attach this container after setting its type. con_attach
         * will handle CT_WORKSPACEs differently */
        workspace = con_new(NULL, NULL);
        char *name;
        asprintf(&name, "[i3 con] workspace %s", num);
        x_set_name(workspace, name);
        free(name);
        workspace->type = CT_WORKSPACE;
        FREE(workspace->name);
        workspace->name = sstrdup(num);
        /* We set ->num to the number if this workspace’s name consists only of
         * a positive number. Otherwise it’s a named ws and num will be -1. */
        char *end;
        long parsed_num = strtol(num, &end, 10);
        if (parsed_num == LONG_MIN ||
            parsed_num == LONG_MAX ||
            parsed_num < 0 ||
            (end && *end != '\0'))
            workspace->num = -1;
        else workspace->num = parsed_num;
        LOG("num = %d\n", workspace->num);

        /* If default_orientation is set to NO_ORIENTATION we
         * determine workspace orientation from workspace size.
         * Otherwise we just set the orientation to default_orientation. */
        if (config.default_orientation == NO_ORIENTATION) {
            workspace->orientation = (output->rect.height > output->rect.width) ? VERT : HORIZ;
            DLOG("Auto orientation. Output resolution set to (%d,%d), setting orientation to %d.\n",
                 workspace->rect.width, workspace->rect.height, workspace->orientation);
        } else {
            workspace->orientation = config.default_orientation;
        }

        con_attach(workspace, content, false);

        ipc_send_event("workspace", I3_IPC_EVENT_WORKSPACE, "{\"change\":\"init\"}");
        if (created != NULL)
            *created = true;
    }
    else if (created != NULL) {
        *created = false;
    }

    return workspace;
}

/*
 * Returns true if the workspace is currently visible. Especially important for
 * multi-monitor environments, as they can have multiple currenlty active
 * workspaces.
 *
 */
bool workspace_is_visible(Con *ws) {
    Con *output = con_get_output(ws);
    if (output == NULL)
        return false;
    Con *fs = con_get_fullscreen_con(output, CF_OUTPUT);
    LOG("workspace visible? fs = %p, ws = %p\n", fs, ws);
    return (fs == ws);
}

/*
 * XXX: we need to clean up all this recursive walking code.
 *
 */
Con *_get_sticky(Con *con, const char *sticky_group, Con *exclude) {
    Con *current;

    TAILQ_FOREACH(current, &(con->nodes_head), nodes) {
        if (current != exclude &&
            current->sticky_group != NULL &&
            current->window != NULL &&
            strcmp(current->sticky_group, sticky_group) == 0)
            return current;

        Con *recurse = _get_sticky(current, sticky_group, exclude);
        if (recurse != NULL)
            return recurse;
    }

    TAILQ_FOREACH(current, &(con->floating_head), floating_windows) {
        if (current != exclude &&
            current->sticky_group != NULL &&
            current->window != NULL &&
            strcmp(current->sticky_group, sticky_group) == 0)
            return current;

        Con *recurse = _get_sticky(current, sticky_group, exclude);
        if (recurse != NULL)
            return recurse;
    }

    return NULL;
}

/*
 * Reassigns all child windows in sticky containers. Called when the user
 * changes workspaces.
 *
 * XXX: what about sticky containers which contain containers?
 *
 */
static void workspace_reassign_sticky(Con *con) {
    Con *current;
    /* 1: go through all containers */

    /* handle all children and floating windows of this node */
    TAILQ_FOREACH(current, &(con->nodes_head), nodes) {
        if (current->sticky_group == NULL) {
            workspace_reassign_sticky(current);
            continue;
        }

        LOG("Ah, this one is sticky: %s / %p\n", current->name, current);
        /* 2: find a window which we can re-assign */
        Con *output = con_get_output(current);
        Con *src = _get_sticky(output, current->sticky_group, current);

        if (src == NULL) {
            LOG("No window found for this sticky group\n");
            workspace_reassign_sticky(current);
            continue;
        }

        x_move_win(src, current);
        current->window = src->window;
        current->mapped = true;
        src->window = NULL;
        src->mapped = false;

        x_reparent_child(current, src);

        LOG("re-assigned window from src %p to dest %p\n", src, current);
    }

    TAILQ_FOREACH(current, &(con->floating_head), floating_windows)
        workspace_reassign_sticky(current);
}

/*
 * Switches to the given workspace
 *
 */
void workspace_show(const char *num) {
    Con *workspace, *current, *old = NULL;

    bool changed_num_workspaces;
    workspace = workspace_get(num, &changed_num_workspaces);

    /* disable fullscreen for the other workspaces and get the workspace we are
     * currently on. */
    TAILQ_FOREACH(current, &(workspace->parent->nodes_head), nodes) {
        if (current->fullscreen_mode == CF_OUTPUT)
            old = current;
        current->fullscreen_mode = CF_NONE;
    }

    /* enable fullscreen for the target workspace. If it happens to be the
     * same one we are currently on anyways, we can stop here. */
    workspace->fullscreen_mode = CF_OUTPUT;
    if (workspace == con_get_workspace(focused)) {
        DLOG("Not switching, already there.\n");
        return;
    }

    workspace_reassign_sticky(workspace);

    LOG("switching to %p\n", workspace);
    Con *next = con_descend_focused(workspace);

    if (old && TAILQ_EMPTY(&(old->nodes_head)) && TAILQ_EMPTY(&(old->floating_head))) {
        /* check if this workspace is currently visible */
        if (!workspace_is_visible(old)) {
            LOG("Closing old workspace (%p / %s), it is empty\n", old, old->name);
            tree_close(old, DONT_KILL_WINDOW, false);
            ipc_send_event("workspace", I3_IPC_EVENT_WORKSPACE, "{\"change\":\"empty\"}");
            changed_num_workspaces = true;
        }
    }

    con_focus(next);
    workspace->fullscreen_mode = CF_OUTPUT;
    LOG("focused now = %p / %s\n", focused, focused->name);

    /* Update the EWMH hints */
    if (changed_num_workspaces)
        ewmh_update_workarea();
    ewmh_update_current_desktop();

    ipc_send_event("workspace", I3_IPC_EVENT_WORKSPACE, "{\"change\":\"focus\"}");
}

/*
 * Focuses the next workspace.
 *
 */
void workspace_next() {
    Con *ws = con_get_workspace(focused);
    Con *next = TAILQ_NEXT(ws, nodes);
    if (!next)
        next = TAILQ_FIRST(&(ws->parent->nodes_head));

    workspace_show(next->name);
}

/*
 * Focuses the previous workspace.
 *
 */
void workspace_prev() {
    Con *ws = con_get_workspace(focused);
    Con *prev = TAILQ_PREV(ws, nodes_head, nodes);
    if (!prev)
        prev = TAILQ_LAST(&(ws->parent->nodes_head), nodes_head);

    workspace_show(prev->name);
}

static bool get_urgency_flag(Con *con) {
    Con *child;
    TAILQ_FOREACH(child, &(con->nodes_head), nodes)
        if (child->urgent || get_urgency_flag(child))
            return true;

    TAILQ_FOREACH(child, &(con->floating_head), floating_windows)
        if (child->urgent || get_urgency_flag(child))
            return true;

    return false;
}

/*
 * Goes through all clients on the given workspace and updates the workspace’s
 * urgent flag accordingly.
 *
 */
void workspace_update_urgent_flag(Con *ws) {
    bool old_flag = ws->urgent;
    ws->urgent = get_urgency_flag(ws);
    DLOG("Workspace urgency flag changed from %d to %d\n", old_flag, ws->urgent);

    if (old_flag != ws->urgent)
        ipc_send_event("workspace", I3_IPC_EVENT_WORKSPACE, "{\"change\":\"urgent\"}");
}

/*
 * 'Forces' workspace orientation by moving all cons into a new split-con with
 * the same orientation as the workspace and then changing the workspace
 * orientation.
 *
 */
void ws_force_orientation(Con *ws, orientation_t orientation) {
    /* 1: create a new split container */
    Con *split = con_new(NULL, NULL);
    split->parent = ws;

    /* 2: copy layout and orientation from workspace */
    split->layout = ws->layout;
    split->orientation = ws->orientation;

    Con *old_focused = TAILQ_FIRST(&(ws->focus_head));

    /* 3: move the existing cons of this workspace below the new con */
    DLOG("Moving cons\n");
    while (!TAILQ_EMPTY(&(ws->nodes_head))) {
        Con *child = TAILQ_FIRST(&(ws->nodes_head));
        con_detach(child);
        con_attach(child, split, true);
    }

    /* 4: switch workspace orientation */
    ws->orientation = orientation;

    /* 5: attach the new split container to the workspace */
    DLOG("Attaching new split to ws\n");
    con_attach(split, ws, false);

    /* 6: fix the percentages */
    con_fix_percent(ws);

    if (old_focused)
        con_focus(old_focused);
}

/*
 * Called when a new con (with a window, not an empty or split con) should be
 * attached to the workspace (for example when managing a new window or when
 * moving an existing window to the workspace level).
 *
 * Depending on the workspace_layout setting, this function either returns the
 * workspace itself (default layout) or creates a new stacked/tabbed con and
 * returns that.
 *
 */
Con *workspace_attach_to(Con *ws) {
    DLOG("Attaching a window to workspace %p / %s\n", ws, ws->name);

    if (config.default_layout == L_DEFAULT) {
        DLOG("Default layout, just attaching it to the workspace itself.\n");
        return ws;
    }

    DLOG("Non-default layout, creating a new split container\n");
    /* 1: create a new split container */
    Con *new = con_new(NULL, NULL);
    new->parent = ws;

    /* 2: set the requested layout on the split con */
    new->layout = config.default_layout;

    /* 3: While the layout is irrelevant in stacked/tabbed mode, it needs
     * to be set. Otherwise, this con will not be interpreted as a split
     * container. */
    if (config.default_orientation == NO_ORIENTATION) {
        new->orientation = (ws->rect.height > ws->rect.width) ? VERT : HORIZ;
    } else {
        new->orientation = config.default_orientation;
    }

    /* 4: attach the new split container to the workspace */
    DLOG("Attaching new split %p to workspace %p\n", new, ws);
    con_attach(new, ws, false);

    return new;
}