#include <arpa/inet.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <unistd.h>

#define BUFFER_SIZE 1024
#define PORT 9090

char *parseRoute(const char *route) {

  if (strcmp(route, "home") == 0) {
    return "./static/index.html";
  } else if (strcmp(route, "about") == 0) {
    return "./static/about.html";
  } else if (strcmp(route, "favicon.ico") == 0) {
    return "./static/favicon.ico";
  } else {
    return "./static/notFound.html";
  }
}

void sendHtml(int *sock, const char *route) {
  // open our html file
  FILE *html = fopen(route, "r");
  if (!html) {
    perror("Error opening html file");
    return;
  }

  char buf[BUFFER_SIZE] = {0};
  size_t read = 0;

  char *header = "HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n";
  send(*sock, header, strlen(header), 0);

  while ((read = fread(buf, sizeof(buf[0]), BUFFER_SIZE, html)) > 0) {
    send(*sock, buf, read, 0);
  }
  fclose(html);
}

int main() {
  int serverSocket;

  if ((serverSocket = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
    perror("socket failed");
    exit(EXIT_FAILURE);
  }

  struct sockaddr_in serverAddr;
  serverAddr.sin_family = AF_INET;
  serverAddr.sin_addr.s_addr = INADDR_ANY;
  serverAddr.sin_port = htons(PORT);

  if (bind(serverSocket, (struct sockaddr *)&serverAddr, sizeof serverAddr) <
      0) {
    perror("bind failed");
    exit(EXIT_FAILURE);
  }

  if (listen(serverSocket, 5) < 0) {
    perror("listen failed");
    exit(EXIT_FAILURE);
  }

  printf("Server listening on port %d\n", PORT);

  while (1) {

    struct sockaddr_in clientAddr;
    socklen_t clientAddr_len = sizeof clientAddr;
    int *clientSocket = malloc(sizeof(int));

    if ((*clientSocket = accept(serverSocket, (struct sockaddr *)&clientAddr,
                                &clientAddr_len)) < 0) {
      perror("accept failed");
      continue;
    }

    printf("Connected\n");

    char recBuf[BUFFER_SIZE] = {0};
    recv(*clientSocket, recBuf, BUFFER_SIZE, 0);
    // printf("%s\n", recBuf);

    char *token = recBuf + 5;
    char *route = strtok(token, " ");

    const char *file = parseRoute(route);
    sendHtml(clientSocket, file);

    close(*clientSocket);
    printf("disconnected client.\n\n");
  }

  close(serverSocket);
  return 0;
}