#include "http.h"
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

typedef struct {
    const char* message;
    size_t message_size;
    size_t i;
} HttpRequestHeaderParser;

HttpMethod parse_method(HttpRequestHeaderParser* parser)
{
    if (parser->i + 3 < parser->message_size && strncmp(&parser->message[0], "GET", 3)) {
        parser->i += 3;
        return HttpMethodGet;
    } else if (parser->i + 4 < parser->message_size && strncmp(&parser->message[0], "POST", 4)) {
        parser->i += 4;
        return HttpMethodPost;
    } else {
        printf("error: http parser: failed to parse http method\n");
        exit(1);
    }
}

void skip_char(HttpRequestHeaderParser* parser, char value)
{
    if (parser->message[parser->i] != value) {
        printf("error: http parser: unexpected character, expected ' '\n");
        exit(1);
    }
    parser->i += 1;
    if (parser->i >= parser->message_size) {
        printf("error: http parser: unexpected end\n");
        exit(1);
    }
}

typedef struct {
    size_t begin, length;
} PathSpan;

HttpRequestHeader parse_http_request_header(const char* message, size_t message_size)
{
    HttpRequestHeaderParser parser = (HttpRequestHeaderParser) {
        .message = message,
        .message_size = message_size,
        .i = 0,
    };
    HttpMethod method = parse_method(&parser);
    skip_char(&parser, ' ');

    return (HttpRequestHeader) { 0 };
}