#include <string.h>
#include <assert.h>
#include <time.h>

#include "../block.h"

#include "../any_log.h"

typedef struct {
    block_text_t block;
    char *format;
} block_date_t;

static const struct timespec block_date_interval = {
    .tv_sec = 1,
    .tv_nsec = 0,
};

static void block_date_update(block_t *block)
{
    block_date_t *date = (block_date_t *)block;

    time_t epoch = time(NULL);
    struct tm *loc_time = localtime(&epoch);

    char buffer[64];
    strftime(buffer, sizeof(buffer), date->format, loc_time);

    free(date->block.text);
    date->block.text = strcopy(buffer);
    assert(date->block.text != NULL);
}

static block_t *block_date_alloc(const block_scheme_t *scheme)
{
    block_t *block = calloc(1, sizeof(block_date_t));
    block->type = BLOCK_TEXT;
    block->update_interval = block_date_interval;
    block->update_fn = block_date_update;
    return block;
}

static void block_date_clean(block_t *block)
{
    block_date_t *date = (block_date_t *)block;
    free(date->format);
    free(date->block.text);
}

static bool block_date_validate(block_t *block, const block_scheme_t *scheme)
{
    block_date_t *date = (block_date_t *)block;

    if (date->block.text == NULL) {
        log_error("Block '%s' requires key '%s'", block->label, "text");
        return false;
    }

    date->format = date->block.text;
    date->block.text = strcopy("?");
    return true;
}

const block_scheme_t block_date_scheme = {
    .name = "date",
    .entries = NULL,
    .alloc_fn = block_date_alloc,
    .clean_fn = block_date_clean,
    .validate_fn = block_date_validate,
    .resolve_fn = NULL,
};