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#include "param.h"
#include "http_server.h"
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static inline uint8_t clamp_u8(int v)
{
if (v < 0) return 0;
if (v > 255) return 255;
return (uint8_t)v;
}
static int parse_fraction(const char* s, fraction_t* out)
{
if (!s) return -1;
char* end = NULL;
float f = strtof(s, &end);
if (end == s) {
return -1;
}
*out = clamp_u8((int)lroundf(f * 255.0f));
return 0;
}
void cmd_handle(fraction_t)(const char* attr, sockbuf_t* sockbuf, fraction_t* ptr)
{
char op_[8];
char buf_[32];
char* op = read_token(sockbuf, op_, sizeof(op_));
char* value = read_token(sockbuf, buf_, sizeof(buf_));
fraction_t curval = *ptr;
fraction_t parsed = 0;
if (!strcmp(op, "+=") || !strcmp(op, "-=") || !strcmp(op, "=")) {
if (parse_fraction(value, &parsed) != 0) {
sockbuf_write(sockbuf, "Invalid value\n");
return;
}
if (!strcmp(op, "+=")) {
curval = clamp_u8((int)curval + (int)parsed);
} else if (!strcmp(op, "-=")) {
curval = clamp_u8((int)curval - (int)parsed);
} else {
curval = parsed;
}
} else {
sockbuf_write(sockbuf, "Unknown operation: '");
sockbuf_write(sockbuf, op);
sockbuf_write(sockbuf, "'\n");
return;
}
*ptr = curval;
snprintf(buf_, sizeof(buf_), "%s = %.3f\n", attr, curval / 255.0f);
sockbuf_write(sockbuf, buf_);
}
size_t serialize_to_json(fraction_t)(
char** out, size_t len, const char* attr, const char* dn, fraction_t value)
{
float fval = value / 255.0f;
size_t newlen = snprintf(
*out,
len,
"\"%s\":{\"type\":\"fraction\",\"value\":\"%.4f\",\"disp\":\"%s\"}",
attr,
fval,
dn);
*out += newlen;
return len - newlen;
}
#define TAG "param_fraction"
void http_handle(fraction_t)(httpd_req_t* req, fraction_t* val)
{
char buf[128];
int buf_len = httpd_req_get_url_query_len(req) + 1;
esp_err_t err;
if (buf_len > 1) {
if (buf_len > sizeof(buf)) {
ESP_LOGI(TAG, "Invalid request. Query string too long.");
httpd_resp_set_status(req, HTTPD_400);
return;
}
if ((err = httpd_req_get_url_query_str(req, buf, buf_len)) == ESP_OK) {
char param[32];
fraction_t parsed;
if (httpd_query_key_value(buf, "add", param, sizeof(param)) == ESP_OK) {
if (parse_fraction(param, &parsed) != 0) {
httpd_resp_set_status(req, HTTPD_400);
return;
}
*val = clamp_u8((int)(*val) + (int)parsed);
} else if (
httpd_query_key_value(buf, "set", param, sizeof(param)) == ESP_OK) {
if (parse_fraction(param, &parsed) != 0) {
httpd_resp_set_status(req, HTTPD_400);
return;
}
*val = parsed;
} else if (
httpd_query_key_value(buf, "sub", param, sizeof(param)) == ESP_OK) {
if (parse_fraction(param, &parsed) != 0) {
httpd_resp_set_status(req, HTTPD_400);
return;
}
*val = clamp_u8((int)(*val) - (int)parsed);
} else {
ESP_LOGI(TAG, "No valid parameters.");
httpd_resp_set_status(req, HTTPD_400);
return;
}
} else {
ESP_LOGI(TAG, "Unable to get URL query string. [%d]", err);
httpd_resp_set_status(req, HTTPD_500);
return;
}
} else {
ESP_LOGI(TAG, "No query string provided?");
httpd_resp_set_status(req, HTTPD_400);
return;
}
httpd_resp_set_status(req, HTTPD_204);
}
void print(fraction_t)(sockbuf_t* sockbuf, const char* attr, fraction_t val)
{
char buf[128];
snprintf(buf, sizeof(buf), "%s: %.3f :: fraction\n", attr, val / 255.0f);
sockbuf_write(sockbuf, buf);
}
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