#include <stdlib.h>
#include <string.h>
#include "world_clock_face.h"
#include "watch.h"
#include "watch_utility.h"

void world_clock_face_setup(movement_settings_t *settings, void ** context_ptr) {
    (void) settings;
    if (*context_ptr == NULL) {
        *context_ptr = malloc(sizeof(world_clock_state_t));
        world_clock_state_t *state = (world_clock_state_t *)*context_ptr;
        state->settings.char_0 = 0;
        state->settings.char_1 = 0;
        state->settings.timezone_index = 16; // start at UTC
    }
}

void world_clock_face_activate(movement_settings_t *settings, void *context) {
    world_clock_state_t *state = (world_clock_state_t *)context;
    state->current_screen = 0;
    state->previous_date_time = 0xFFFFFFFF;

    if (watch_tick_animation_is_running()) watch_stop_tick_animation();
    if (settings->bit.clock_mode_24h) watch_set_indicator(WATCH_INDICATOR_24H);

    watch_set_colon();
}

bool world_clock_face_do_display_mode(movement_event_t event, movement_settings_t *settings, world_clock_state_t *state) {
    char buf[11];
    uint8_t pos;

    uint32_t timestamp;
    uint32_t previous_date_time;
    watch_date_time date_time;
    switch (event.event_type) {
        case EVENT_ACTIVATE:
        case EVENT_TICK:
        case EVENT_LOW_ENERGY_UPDATE:
            date_time = watch_rtc_get_date_time();
            timestamp = watch_utility_date_time_to_unix_time(date_time, movement_timezone_offsets[settings->bit.time_zone] * 60);
            date_time = watch_utility_date_time_from_unix_time(timestamp, movement_timezone_offsets[state->settings.timezone_index] * 60);
            previous_date_time = state->previous_date_time;
            state->previous_date_time = date_time.reg;

            if (date_time.reg >> 6 == previous_date_time >> 6 && event.event_type != EVENT_LOW_ENERGY_UPDATE) {
                // everything before seconds is the same, don't waste cycles setting those segments.
                pos = 8;
                sprintf(buf, "%02d", date_time.unit.second);
            } else if (date_time.reg >> 12 == previous_date_time >> 12 && event.event_type != EVENT_LOW_ENERGY_UPDATE) {
                // everything before minutes is the same.
                pos = 6;
                sprintf(buf, "%02d%02d", date_time.unit.minute, date_time.unit.second);
            } else {
                // other stuff changed; let's do it all.
                if (!settings->bit.clock_mode_24h) {
                    // if we are in 12 hour mode, do some cleanup.
                    if (date_time.unit.hour < 12) {
                        watch_clear_indicator(WATCH_INDICATOR_PM);
                    } else {
                        watch_set_indicator(WATCH_INDICATOR_PM);
                    }
                    date_time.unit.hour %= 12;
                    if (date_time.unit.hour == 0) date_time.unit.hour = 12;
                }
                pos = 0;
                if (event.event_type == EVENT_LOW_ENERGY_UPDATE) {
                    if (!watch_tick_animation_is_running()) watch_start_tick_animation(500);
                    sprintf(buf, "%c%c%2d%2d%02d  ",
                        movement_valid_position_0_chars[state->settings.char_0],
                        movement_valid_position_1_chars[state->settings.char_1],
                        date_time.unit.day,
                        date_time.unit.hour,
                        date_time.unit.minute);
                } else {
                    sprintf(buf, "%c%c%2d%2d%02d%02d",
                        movement_valid_position_0_chars[state->settings.char_0],
                        movement_valid_position_1_chars[state->settings.char_1],
                        date_time.unit.day,
                        date_time.unit.hour,
                        date_time.unit.minute,
                        date_time.unit.second);
                }
            }
            watch_display_string(buf, pos);
            break;
        case EVENT_MODE_BUTTON_UP:
            movement_move_to_next_face();
            return false;
        case EVENT_LIGHT_BUTTON_DOWN:
            movement_illuminate_led();
            break;
        case EVENT_ALARM_LONG_PRESS:
            movement_request_tick_frequency(4);
            state->current_screen = 1;
            break;
        default:
            break;
    }

    return true;
}

bool world_clock_face_do_settings_mode(movement_event_t event, movement_settings_t *settings, world_clock_state_t *state) {
    switch (event.event_type) {
        case EVENT_MODE_BUTTON_UP:
            movement_move_to_next_face();
            return false;
        case EVENT_LIGHT_BUTTON_DOWN:
            state->current_screen++;
            if (state->current_screen > 3) {
                movement_request_tick_frequency(1);
                state->current_screen = 0;
                state->previous_date_time = 0xFFFFFFFF;
                world_clock_face_do_display_mode(event, settings, state);
            }
            break;
        case EVENT_ALARM_BUTTON_DOWN:
            switch (state->current_screen) {
                case 1:
                    state->settings.char_0++;
                    if (state->settings.char_0 >= strlen(movement_valid_position_0_chars)) {
                        state->settings.char_0 = 0;
                    }
                    break;
                case 2:
                    state->settings.char_1++;
                    if (state->settings.char_1 >= strlen(movement_valid_position_1_chars)) {
                        state->settings.char_1 = 0;
                    }
                    break;
                case 3:
                    state->settings.timezone_index++;
                    if (state->settings.timezone_index > 40) state->settings.timezone_index = 0;
                    break;
            }
            break;
        case EVENT_TIMEOUT:
            movement_move_to_face(0);
            break;
        default:
            break;
    }

    char buf[13];
    sprintf(buf, "%c%c %3d%02d  ",
        movement_valid_position_0_chars[state->settings.char_0],
        movement_valid_position_1_chars[state->settings.char_1],
        (int8_t) (movement_timezone_offsets[state->settings.timezone_index] / 60),
        (int8_t) (movement_timezone_offsets[state->settings.timezone_index] % 60) * (movement_timezone_offsets[state->settings.timezone_index] < 0 ? -1 : 1));
    watch_set_colon();
    watch_clear_indicator(WATCH_INDICATOR_PM);

    // blink up the parameter we're setting
    if (event.subsecond % 2) {
        switch (state->current_screen) {
            case 1:
            case 2:
                buf[state->current_screen - 1] = '_';
                break;
            case 3:
                watch_clear_colon();
                sprintf(buf + 3, "       ");
                break;
        }
    }

    watch_display_string(buf, 0);

    return true;
}

bool world_clock_face_loop(movement_event_t event, movement_settings_t *settings, void *context) {
    world_clock_state_t *state = (world_clock_state_t *)context;

    if (state->current_screen == 0) {
        return world_clock_face_do_display_mode(event, settings, state);
    } else {
        return world_clock_face_do_settings_mode(event, settings, state);
    }
}

void world_clock_face_resign(movement_settings_t *settings, void *context) {
    (void) settings;
    (void) context;
    movement_request_tick_frequency(1);
}