#include <string.h>
#include <stdio.h>
#include <assert.h>
#include <stdlib.h>

#include "../block.h"

#include "../any_log.h"

typedef struct {
    block_text_t block;
    char *script;
} block_script_t;

static const struct timespec block_script_interval = {
    .tv_sec = 30,
    .tv_nsec = 0,
};

static void block_script_update(block_t *block)
{
    block_script_t *script = (block_script_t *)block;

    FILE *output = popen(script->script, "r");
    if (output == NULL) {
        log_value_debug("Failed to execute a script",
                        "s:label", block->label,
                        "s:script", script->script,
                        "i:errno", errno);
        return;
    }

    char buffer[128] = { 0 };
    fgets(buffer, sizeof(buffer), output);
    pclose(output);

    log_value_trace("Executed a script",
                    "s:label", block->label,
                    "s:script", script->script);

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

static void block_script_init(block_t *block)
{
    extern const block_scheme_t block_text_scheme;
    block_text_scheme.init_fn(block);
    block->update_interval = block_script_interval;
    block->update_fn = block_script_update;
}

static void block_script_clean(block_t *block)
{
    block_script_t *script = (block_script_t *)block;
    free(script->script);
    free(script->block.text);
}

static int block_script_validate(block_t *block, config_t *config)
{
    block_script_t *script = (block_script_t *)block;
    int errors = 0;

    if (script->block.text == NULL) {
        log_error("Block '%s' requires key '%s'", block->label, "text");
        errors++;
    }

    script->script = script->block.text;
    script->block.text = strcopy("?");
    return errors;
}

static const config_entry_t block_script_entries[] = {
    { 0 },
};

const block_scheme_t block_script_scheme = {
    .name = "script",
    .entries = block_script_entries,
    .size = sizeof(block_script_t),
    .init_fn = block_script_init,
    .clean_fn = block_script_clean,
    .validate_fn = block_script_validate,
};