/**
 * Copyright (c) 2015, Michael Casadevall
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 **/

#include "Debug.h"
#include "LuaTools.h"
#include "PluginManager.h"
#include "PluginLua.h"

#include "modules/Persistence.h"
#include "modules/Units.h"
#include "modules/World.h"

#include "df/world.h"

using namespace DFHack;
using std::string;
using std::vector;

DFHACK_PLUGIN("dwarfvet");
DFHACK_PLUGIN_IS_ENABLED(is_enabled);

REQUIRE_GLOBAL(world);

namespace DFHack {
    // for configuration-related logging
    DBG_DECLARE(dwarfvet, control, DebugCategory::LINFO);
    // for logging during the periodic scan
    DBG_DECLARE(dwarfvet, cycle, DebugCategory::LINFO);
}

static const string CONFIG_KEY = string(plugin_name) + "/config";
static PersistentDataItem config;
enum ConfigValues {
    CONFIG_IS_ENABLED = 0,
};

static const int32_t CYCLE_TICKS = 2459; // a prime number that's around 2 days
static int32_t cycle_timestamp = 0;  // world->frame_counter at last cycle

static command_result do_command(color_ostream &out, vector<string> &parameters);
static void dwarfvet_cycle(color_ostream &out);

DFhackCExport command_result plugin_init(color_ostream &out, vector <PluginCommand> &commands) {
    commands.push_back(PluginCommand(
        plugin_name,
        "Allow animals to be treated at hospitals.",
        do_command));
    return CR_OK;
}

DFhackCExport command_result plugin_enable(color_ostream &out, bool enable) {
    if (!Core::getInstance().isMapLoaded() || !World::isFortressMode()) {
        out.printerr("Cannot enable %s without a loaded fort.\n", plugin_name);
        return CR_FAILURE;
    }

    if (enable != is_enabled) {
        is_enabled = enable;
        DEBUG(control,out).print("%s from the API; persisting\n",
                                is_enabled ? "enabled" : "disabled");
        config.set_bool(CONFIG_IS_ENABLED, is_enabled);
    } else {
        DEBUG(control,out).print("%s from the API, but already %s; no action\n",
                                is_enabled ? "enabled" : "disabled",
                                is_enabled ? "enabled" : "disabled");
    }
    return CR_OK;
}

DFhackCExport command_result plugin_load_site_data(color_ostream &out) {
    cycle_timestamp = 0;
    config = World::GetPersistentSiteData(CONFIG_KEY);

    if (!config.isValid()) {
        DEBUG(control,out).print("no config found in this save; initializing\n");
        config = World::AddPersistentSiteData(CONFIG_KEY);
        config.set_bool(CONFIG_IS_ENABLED, is_enabled);
    }

    is_enabled = config.get_bool(CONFIG_IS_ENABLED);
    DEBUG(control,out).print("loading persisted enabled state: %s\n",
                            is_enabled ? "true" : "false");
    return CR_OK;
}

DFhackCExport command_result plugin_onstatechange(color_ostream &out, state_change_event event) {
    if (event == DFHack::SC_WORLD_UNLOADED) {
        if (is_enabled) {
            DEBUG(control,out).print("world unloaded; disabling %s\n",
                                    plugin_name);
            is_enabled = false;
        }
    }
    return CR_OK;
}

DFhackCExport command_result plugin_onupdate(color_ostream &out) {
    if (world->frame_counter - cycle_timestamp >= CYCLE_TICKS)
        dwarfvet_cycle(out);
    return CR_OK;
}

static command_result do_command(color_ostream &out, vector<string> &parameters) {
    if (!Core::getInstance().isMapLoaded() || !World::isFortressMode()) {
        out.printerr("Cannot run %s without a loaded fort.\n", plugin_name);
        return CR_FAILURE;
    }

    bool show_help = false;
    if (!Lua::CallLuaModuleFunction(out, "plugins.dwarfvet", "parse_commandline", make_tuple(parameters),
            1, [&](lua_State *L) {
                show_help = !lua_toboolean(L, -1);
            })) {
        return CR_FAILURE;
    }

    return show_help ? CR_WRONG_USAGE : CR_OK;
}

static void dwarfvet_cycle(color_ostream &out) {
    // mark that we have recently run
    cycle_timestamp = world->frame_counter;

    DEBUG(cycle,out).print("running %s cycle\n", plugin_name);
    Lua::CallLuaModuleFunction(out, "plugins.dwarfvet", "checkup");
}

DFHACK_PLUGIN_LUA_FUNCTIONS {
    DFHACK_LUA_FUNCTION(dwarfvet_cycle),
    DFHACK_LUA_END
};