/*
Copyright 2013 Mathias Andersson <wraul@dbox.se>

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, see <http://www.gnu.org/licenses/>.
*/

#include "backlight.h"
#include "eeprom.h"
#include "eeconfig.h"
#include "debug.h"

backlight_config_t backlight_config;

#ifndef BACKLIGHT_DEFAULT_ON
#    define BACKLIGHT_DEFAULT_ON true
#endif

#ifndef BACKLIGHT_DEFAULT_LEVEL
#    define BACKLIGHT_DEFAULT_LEVEL BACKLIGHT_LEVELS
#endif

#ifndef BACKLIGHT_DEFAULT_BREATHING
#    define BACKLIGHT_DEFAULT_BREATHING false
#else
#    undef BACKLIGHT_DEFAULT_BREATHING
#    define BACKLIGHT_DEFAULT_BREATHING true
#endif

#ifdef BACKLIGHT_BREATHING
// TODO: migrate to backlight_config_t
static uint8_t breathing_period = BREATHING_PERIOD;
#endif

static void backlight_check_config(void) {
    /* Add some out of bound checks for backlight config */

    if (backlight_config.level > BACKLIGHT_LEVELS) {
        backlight_config.level = BACKLIGHT_LEVELS;
    }
}

/** \brief Backlight initialization
 *
 * FIXME: needs doc
 */
void backlight_init(void) {
    backlight_config.raw = eeconfig_read_backlight();
    if (!backlight_config.valid) {
        dprintf("backlight_init backlight_config.valid = 0. Write default values to EEPROM.\n");
        eeconfig_update_backlight_default();
    }
    backlight_check_config();

    backlight_set(backlight_config.enable ? backlight_config.level : 0);
}

/** \brief Backlight increase
 *
 * FIXME: needs doc
 */
void backlight_increase(void) {
    if (backlight_config.level < BACKLIGHT_LEVELS) {
        backlight_config.level++;
    }
    backlight_config.enable = 1;
    eeconfig_update_backlight(backlight_config.raw);
    dprintf("backlight increase: %u\n", backlight_config.level);
    backlight_set(backlight_config.level);
}

/** \brief Backlight decrease
 *
 * FIXME: needs doc
 */
void backlight_decrease(void) {
    if (backlight_config.level > 0) {
        backlight_config.level--;
        backlight_config.enable = !!backlight_config.level;
        eeconfig_update_backlight(backlight_config.raw);
    }
    dprintf("backlight decrease: %u\n", backlight_config.level);
    backlight_set(backlight_config.level);
}

/** \brief Backlight toggle
 *
 * FIXME: needs doc
 */
void backlight_toggle(void) {
    bool enabled = backlight_config.enable;
    dprintf("backlight toggle: %u\n", enabled);
    if (enabled)
        backlight_disable();
    else
        backlight_enable();
}

/** \brief Enable backlight
 *
 * FIXME: needs doc
 */
void backlight_enable(void) {
    if (backlight_config.enable) return; // do nothing if backlight is already on

    backlight_config.enable = true;
    if (backlight_config.raw == 1) // enabled but level == 0
        backlight_config.level = 1;
    eeconfig_update_backlight(backlight_config.raw);
    dprintf("backlight enable\n");
    backlight_set(backlight_config.level);
}

/** \brief Disable backlight
 *
 * FIXME: needs doc
 */
void backlight_disable(void) {
    if (!backlight_config.enable) return; // do nothing if backlight is already off

    backlight_config.enable = false;
    eeconfig_update_backlight(backlight_config.raw);
    dprintf("backlight disable\n");
    backlight_set(0);
}

/** /brief Get the backlight status
 *
 * FIXME: needs doc
 */
bool is_backlight_enabled(void) {
    return backlight_config.enable;
}

/** \brief Backlight step through levels
 *
 * FIXME: needs doc
 */
void backlight_step(void) {
    backlight_config.level++;
    if (backlight_config.level > BACKLIGHT_LEVELS) {
        backlight_config.level = 0;
    }
    backlight_config.enable = !!backlight_config.level;
    eeconfig_update_backlight(backlight_config.raw);
    dprintf("backlight step: %u\n", backlight_config.level);
    backlight_set(backlight_config.level);
}

/** \brief Backlight set level without EEPROM update
 *
 */
void backlight_level_noeeprom(uint8_t level) {
    if (level > BACKLIGHT_LEVELS) level = BACKLIGHT_LEVELS;
    backlight_config.level  = level;
    backlight_config.enable = !!backlight_config.level;
    backlight_set(backlight_config.level);
}

/** \brief Backlight set level
 *
 * FIXME: needs doc
 */
void backlight_level(uint8_t level) {
    backlight_level_noeeprom(level);
    eeconfig_update_backlight(backlight_config.raw);
}

uint8_t eeconfig_read_backlight(void) {
    return eeprom_read_byte(EECONFIG_BACKLIGHT);
}

void eeconfig_update_backlight(uint8_t val) {
    eeprom_update_byte(EECONFIG_BACKLIGHT, val);
}

void eeconfig_update_backlight_current(void) {
    eeconfig_update_backlight(backlight_config.raw);
}

void eeconfig_update_backlight_default(void) {
    backlight_config.valid     = true;
    backlight_config.enable    = BACKLIGHT_DEFAULT_ON;
    backlight_config.breathing = BACKLIGHT_DEFAULT_BREATHING;
    backlight_config.level     = BACKLIGHT_DEFAULT_LEVEL;
    eeconfig_update_backlight(backlight_config.raw);
}

/** \brief Get backlight level
 *
 * FIXME: needs doc
 */
uint8_t get_backlight_level(void) {
    return backlight_config.level;
}

#ifdef BACKLIGHT_BREATHING
/** \brief Backlight breathing toggle
 *
 * FIXME: needs doc
 */
void backlight_toggle_breathing(void) {
    bool breathing = backlight_config.breathing;
    dprintf("backlight breathing toggle: %u\n", breathing);
    if (breathing)
        backlight_disable_breathing();
    else
        backlight_enable_breathing();
}

/** \brief Enable backlight breathing
 *
 * FIXME: needs doc
 */
void backlight_enable_breathing(void) {
    if (backlight_config.breathing) return; // do nothing if breathing is already on

    backlight_config.breathing = true;
    eeconfig_update_backlight(backlight_config.raw);
    dprintf("backlight breathing enable\n");
    breathing_enable();
}

/** \brief Disable backlight breathing
 *
 * FIXME: needs doc
 */
void backlight_disable_breathing(void) {
    if (!backlight_config.breathing) return; // do nothing if breathing is already off

    backlight_config.breathing = false;
    eeconfig_update_backlight(backlight_config.raw);
    dprintf("backlight breathing disable\n");
    breathing_disable();
}

/** \brief Get the backlight breathing status
 *
 * FIXME: needs doc
 */
bool is_backlight_breathing(void) {
    return backlight_config.breathing;
}

// following are marked as weak purely for backwards compatibility
__attribute__((weak)) void breathing_period_set(uint8_t value) {
    breathing_period = value ? value : 1;
}

__attribute__((weak)) uint8_t get_breathing_period(void) {
    return breathing_period;
}

__attribute__((weak)) void breathing_period_default(void) {
    breathing_period_set(BREATHING_PERIOD);
}

__attribute__((weak)) void breathing_period_inc(void) {
    breathing_period_set(breathing_period + 1);
}

__attribute__((weak)) void breathing_period_dec(void) {
    breathing_period_set(breathing_period - 1);
}

__attribute__((weak)) void breathing_toggle(void) {
    if (is_breathing())
        breathing_disable();
    else
        breathing_enable();
}

#endif

// defaults for backlight api
__attribute__((weak)) void backlight_init_ports(void) {}

__attribute__((weak)) void backlight_set(uint8_t level) {}

__attribute__((weak)) void backlight_task(void) {}
