/*
 * gncEntryLedgerDisplay.c -- handle the display management for an Entry Ledger
 * Copyright (C) 2002, 2003 Derek Atkins
 * Author: Derek Atkins <warlord@MIT.EDU>
 *
 * 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, contact:
 *
 * Free Software Foundation           Voice:  +1-617-542-5942
 * 51 Franklin Street, Fifth Floor    Fax:    +1-617-542-2652
 * Boston, MA  02110-1301,  USA       gnu@gnu.org
 */

#include <config.h>

#include <glib.h>

#include "gnc-ui-util.h"
#include "gnc-component-manager.h"
#include "gnc-event.h"
#include "gnc-prefs.h"

#include "gncEntry.h"
#include "gncEntryLedger.h"
#include "gncEntryLedgerP.h"

#define ENTRYLEDGER_CLASS	"entry-ledger-class"

/* Return the list of entries (NOTE: Should use a query here!) */
static GList *
gnc_entry_ledger_get_entries (GncEntryLedger *ledger)
{
    if (ledger->query)
        return qof_query_run (ledger->query);

    //  g_warning ("No query to run?");
    return NULL;
}

static void
gnc_entry_ledger_refresh_internal (GncEntryLedger *ledger, GList *entries)
{
    if (!ledger || ledger->loading)
        return;

    /* If not full refresh ok, just load the xfer cells */
    if (!ledger->full_refresh)
    {
        gnc_entry_ledger_load_xfer_cells (ledger);
        return;
    }

    /* Viewers must always have at least one entry! */
    if ((ledger->type == GNCENTRY_ORDER_VIEWER ||
            ledger->type == GNCENTRY_INVOICE_VIEWER ||
            ledger->type == GNCENTRY_BILL_VIEWER ||
            ledger->type == GNCENTRY_EXPVOUCHER_VIEWER) && !entries)
        return;

    ledger->loading = TRUE;
    gnc_entry_ledger_load (ledger, entries);
    ledger->loading = FALSE;
}

static void
gnc_entry_ledger_pref_changed (gpointer prefs, gchar *pref, gpointer user_data)
{
    GncEntryLedger *ledger = user_data;

    g_return_if_fail (ledger && pref);

    if (g_str_has_suffix (pref, GNC_PREF_ACCOUNT_SEPARATOR))
    {
        gnc_entry_ledger_display_refresh (ledger);
    }
    else
    {
        g_warning ("gnc_entry_ledger_pref_changed: Unknown preference %s", pref);
    }
}

static void
gnc_entry_ledger_set_watches (GncEntryLedger *ledger, GList *entries)
{
    GList *node;
    QofIdType type = NULL;

    gnc_gui_component_clear_watches (ledger->component_id);

    switch (ledger->type)
    {
    case GNCENTRY_ORDER_ENTRY:
    case GNCENTRY_ORDER_VIEWER:
        type = GNC_ORDER_MODULE_NAME;
        break;

    case GNCENTRY_INVOICE_ENTRY:
    case GNCENTRY_CUST_CREDIT_NOTE_ENTRY:
        /* Watch the invoice owner to see when items get added via orders */
        gnc_gui_component_watch_entity (ledger->component_id,
                                        gncOwnerGetGUID
                                        (gncInvoiceGetOwner (ledger->invoice)),
                                        QOF_EVENT_MODIFY);
    case GNCENTRY_INVOICE_VIEWER:
    case GNCENTRY_CUST_CREDIT_NOTE_VIEWER:
    case GNCENTRY_BILL_ENTRY:
    case GNCENTRY_BILL_VIEWER:
    case GNCENTRY_EXPVOUCHER_ENTRY:
    case GNCENTRY_EXPVOUCHER_VIEWER:
    case GNCENTRY_VEND_CREDIT_NOTE_ENTRY:
    case GNCENTRY_VEND_CREDIT_NOTE_VIEWER:
    case GNCENTRY_EMPL_CREDIT_NOTE_ENTRY:
    case GNCENTRY_EMPL_CREDIT_NOTE_VIEWER:
        type = GNC_INVOICE_MODULE_NAME;
        break;

    default:
        g_warning ("Invalid ledger type");
        break;
    }

    gnc_gui_component_watch_entity_type (ledger->component_id,
                                         type,
                                         QOF_EVENT_MODIFY | QOF_EVENT_DESTROY);

    /* To make sure the xfer cell is up to date */
    gnc_gui_component_watch_entity_type (ledger->component_id,
                                         GNC_ID_ACCOUNT,
                                         QOF_EVENT_MODIFY | QOF_EVENT_DESTROY
                                         | GNC_EVENT_ITEM_CHANGED);

    /* To make sure the taxtable cell is up to date */
    gnc_gui_component_watch_entity_type (ledger->component_id,
                                         GNC_TAXTABLE_MODULE_NAME,
                                         QOF_EVENT_MODIFY | QOF_EVENT_DESTROY);

    /* For expense vouchers, watch the employee and refresh if it's changed */
    if (ledger->type == GNCENTRY_EXPVOUCHER_ENTRY)
    {
        const GncOwner *owner = gncOwnerGetEndOwner (gncInvoiceGetOwner (ledger->invoice));
        GncEmployee *employee = gncOwnerGetEmployee (owner);

        if (employee)
            gnc_gui_component_watch_entity (ledger->component_id,
                                            gncEmployeeGetGUID (employee),
                                            QOF_EVENT_MODIFY);
    }

    for (node = entries; node; node = node->next)
    {
        GncEntry *entry = node->data;
        gnc_gui_component_watch_entity (ledger->component_id,
                                        gncEntryGetGUID (entry),
                                        QOF_EVENT_MODIFY);
    }
}

static void
refresh_handler (GHashTable *changes, gpointer user_data)
{
    GncEntryLedger *ledger = user_data;

    gnc_entry_ledger_display_refresh (ledger);
}

void
gnc_entry_ledger_display_init (GncEntryLedger *ledger)
{
    if (!ledger) return;

    ledger->full_refresh = TRUE;
    ledger->component_id = gnc_register_gui_component (ENTRYLEDGER_CLASS,
                           refresh_handler,
                           NULL, ledger);
    gnc_prefs_register_cb (GNC_PREFS_GROUP_GENERAL, GNC_PREF_ACCOUNT_SEPARATOR,
                           gnc_entry_ledger_pref_changed, ledger);

    gnc_entry_ledger_display_refresh (ledger);
}

void
gnc_entry_ledger_display_fini (GncEntryLedger *ledger)
{
    if (!ledger) return;

    gnc_unregister_gui_component (ledger->component_id);
    gnc_prefs_remove_cb_by_func (GNC_PREFS_GROUP_GENERAL, GNC_PREF_ACCOUNT_SEPARATOR,
                                 gnc_entry_ledger_pref_changed, ledger);
}

void
gnc_entry_ledger_display_refresh (GncEntryLedger *ledger)
{
    GList *entries;

    if (!ledger || ledger->loading) return;

    entries = gnc_entry_ledger_get_entries (ledger);

    gnc_entry_ledger_set_watches (ledger, entries);

    gnc_entry_ledger_refresh_internal (ledger, entries);
}
