#include <petscwebclient.h>
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
#pragma gcc diagnostic   ignored "-Wdeprecated-declarations"

/*
   These variables identify the code as a PETSc application to Box.

   See -   https://stackoverflow.com/questions/4616553/using-oauth-in-free-open-source-software
   Users can get their own application IDs - goto https://developer.box.com

*/
#define PETSC_BOX_CLIENT_ID "sse42nygt4zqgrdwi0luv79q1u1f0xza"
#define PETSC_BOX_CLIENT_ST "A0Dy4KgOYLB2JIYZqpbze4EzjeIiX5k4"

#if defined(PETSC_HAVE_SAWS)
  #include <mongoose.h>

static volatile char *result = NULL;

static int PetscBoxWebServer_Private(struct mg_connection *conn)
{
  const struct mg_request_info *request_info = mg_get_request_info(conn);
  result                                     = (char *)request_info->query_string;
  return 1; /* Mongoose will now not handle the request */
}

/*
    Box can only return an authorization code to a Webserver, hence we need to start one up and wait for
    the authorization code to arrive from Box
*/
static PetscErrorCode PetscBoxStartWebServer_Private(void)
{
  int                 optionsLen = 5;
  const char         *options[optionsLen];
  struct mg_callbacks callbacks;
  struct mg_context  *ctx;
  char                keyfile[PETSC_MAX_PATH_LEN];
  PetscBool           exists;

  PetscFunctionBegin;
  options[0] = "listening_ports";
  options[1] = "8081s";

  PetscCall(PetscStrncpy(keyfile, "sslclient.pem", sizeof(keyfile)));
  PetscCall(PetscTestFile(keyfile, 'r', &exists));
  if (!exists) {
    PetscCall(PetscGetHomeDirectory(keyfile, PETSC_MAX_PATH_LEN));
    PetscCall(PetscStrlcat(keyfile, "/", sizeof(keyfile)));
    PetscCall(PetscStrlcat(keyfile, "sslclient.pem", sizeof(keyfile)));
    PetscCall(PetscTestFile(keyfile, 'r', &exists));
    PetscCheck(exists, PETSC_COMM_SELF, PETSC_ERR_FILE_OPEN, "Unable to locate sslclient.pem file in current directory or home directory");
  }

  options[2] = "ssl_certificate";
  options[3] = keyfile;
  options[4] = NULL;

  /* Prepare callbacks structure. We have only one callback, the rest are NULL. */
  PetscCall(PetscMemzero(&callbacks, sizeof(callbacks)));
  callbacks.begin_request = PetscBoxWebServer_Private;
  ctx                     = mg_start(&callbacks, NULL, options);
  PetscCheck(ctx, PETSC_COMM_SELF, PETSC_ERR_LIB, "Unable to start up webserver");
  while (!result) { };
  PetscFunctionReturn(PETSC_SUCCESS);
}

  #if defined(PETSC_HAVE_UNISTD_H)
    #include <unistd.h>
  #endif

/*@C
     PetscBoxAuthorize - Get authorization and refresh token for accessing Box drive from PETSc

   Not collective, only the first rank in `MPI_Comm` does anything

   Input Parameters:
+  comm - the MPI communicator
-  tokensize - size of the token arrays

   Output Parameters:
+  access_token - can be used with `PetscBoxUpload()` for this one session
-  refresh_token - can be used for ever to obtain new access_tokens with `PetscBoxRefresh()`, guard this like a password
                   it gives access to your Box Drive

   Notes:
    This call requires stdout and stdin access from process 0 on the MPI communicator

   You can run src/sys/webclient/tutorials/boxobtainrefreshtoken to get a refresh token and then in the future pass it to
   PETSc programs with -box_refresh_token XXX

   This requires PETSc be installed using --with-saws or --download-saws

   Requires the user have created a self-signed ssl certificate with

$    saws/CA.pl  -newcert  (using the passphrase of password)
$    cat newkey.pem newcert.pem > sslclient.pem

    and put the resulting file in either the current directory (with the application) or in the home directory. This seems kind of
    silly but it was all I could figure out.

   Level: intermediate

.seealso: `PetscBoxRefresh()`, `PetscBoxUpload()`, `PetscURLShorten()`
@*/
PetscErrorCode PetscBoxAuthorize(MPI_Comm comm, char access_token[], char refresh_token[], size_t tokensize)
{
  SSL_CTX    *ctx;
  SSL        *ssl;
  int         sock;
  char        buff[8 * 1024], body[1024];
  PetscMPIInt rank;
  PetscBool   flg, found;

  PetscFunctionBegin;
  PetscCallMPI(MPI_Comm_rank(comm, &rank));
  if (rank == 0) {
    PetscCheck(isatty(fileno(PETSC_STDOUT)), PETSC_COMM_SELF, PETSC_ERR_USER, "Requires users input/output");
    PetscCall(PetscPrintf(comm, "Cut and paste the following into your browser:\n\n"
                                "https://www.box.com/api/oauth2/authorize?"
                                "response_type=code&"
                                "client_id=" PETSC_BOX_CLIENT_ID "&state=PETScState"
                                "\n\n"));
    PetscCall(PetscBoxStartWebServer_Private());
    PetscCall(PetscStrbeginswith((const char *)result, "state=PETScState&code=", &flg));
    PetscCheck(flg, PETSC_COMM_SELF, PETSC_ERR_LIB, "Did not get expected string from Box got %s", result);
    PetscCall(PetscStrncpy(buff, (const char *)result + 22, sizeof(buff)));

    PetscCall(PetscSSLInitializeContext(&ctx));
    PetscCall(PetscHTTPSConnect("www.box.com", 443, ctx, &sock, &ssl));
    PetscCall(PetscStrncpy(body, "code=", sizeof(body)));
    PetscCall(PetscStrlcat(body, buff, sizeof(body)));
    PetscCall(PetscStrlcat(body, "&client_id=", sizeof(body)));
    PetscCall(PetscStrlcat(body, PETSC_BOX_CLIENT_ID, sizeof(body)));
    PetscCall(PetscStrlcat(body, "&client_secret=", sizeof(body)));
    PetscCall(PetscStrlcat(body, PETSC_BOX_CLIENT_ST, sizeof(body)));
    PetscCall(PetscStrlcat(body, "&grant_type=authorization_code", sizeof(body)));

    PetscCall(PetscHTTPSRequest("POST", "www.box.com/api/oauth2/token", NULL, "application/x-www-form-urlencoded", body, ssl, buff, sizeof(buff)));
    PetscCall(PetscSSLDestroyContext(ctx));
    close(sock);

    PetscCall(PetscPullJSONValue(buff, "access_token", access_token, tokensize, &found));
    PetscCheck(found, PETSC_COMM_SELF, PETSC_ERR_LIB, "Box did not return access token");
    PetscCall(PetscPullJSONValue(buff, "refresh_token", refresh_token, tokensize, &found));
    PetscCheck(found, PETSC_COMM_SELF, PETSC_ERR_LIB, "Box did not return refresh token");

    PetscCall(PetscPrintf(comm, "Here is your Box refresh token, save it in a save place, in the future you can run PETSc\n"));
    PetscCall(PetscPrintf(comm, "programs with the option -box_refresh_token %s\n", refresh_token));
    PetscCall(PetscPrintf(comm, "to access Box Drive automatically\n"));
  }
  PetscFunctionReturn(PETSC_SUCCESS);
}
#endif

/*@C
     PetscBoxRefresh - Get a new authorization token for accessing Box drive from PETSc from a refresh token

   Not collective, only the first process in the `MPI_Comm` does anything

   Input Parameters:
+   comm - MPI communicator
.   refresh token - obtained with `PetscBoxAuthorize()`, if NULL PETSc will first look for one in the options data
                    if not found it will call `PetscBoxAuthorize()`
-   tokensize - size of the output string access_token

   Output Parameters:
+   access_token - token that can be passed to `PetscBoxUpload()`
-   new_refresh_token - the old refresh token is no longer valid, not this is different than Google where the same refresh_token is used forever

   Level: intermediate

.seealso: `PetscURLShorten()`, `PetscBoxAuthorize()`, `PetscBoxUpload()`
@*/
PetscErrorCode PetscBoxRefresh(MPI_Comm comm, const char refresh_token[], char access_token[], char new_refresh_token[], size_t tokensize)
{
  SSL_CTX    *ctx;
  SSL        *ssl;
  int         sock;
  char        buff[8 * 1024], body[1024];
  PetscMPIInt rank;
  char       *refreshtoken = (char *)refresh_token;
  PetscBool   found;

  PetscFunctionBegin;
  PetscCallMPI(MPI_Comm_rank(comm, &rank));
  if (rank == 0) {
    if (!refresh_token) {
      PetscBool set;
      PetscCall(PetscMalloc1(512, &refreshtoken));
      PetscCall(PetscOptionsGetString(NULL, NULL, "-box_refresh_token", refreshtoken, sizeof(refreshtoken), &set));
#if defined(PETSC_HAVE_SAWS)
      if (!set) {
        PetscCall(PetscBoxAuthorize(comm, access_token, new_refresh_token, 512 * sizeof(char)));
        PetscCall(PetscFree(refreshtoken));
        PetscFunctionReturn(PETSC_SUCCESS);
      }
#else
      PetscCheck(set, PETSC_COMM_SELF, PETSC_ERR_LIB, "Must provide refresh token with -box_refresh_token XXX");
#endif
    }
    PetscCall(PetscSSLInitializeContext(&ctx));
    PetscCall(PetscHTTPSConnect("www.box.com", 443, ctx, &sock, &ssl));
    PetscCall(PetscStrncpy(body, "client_id=", sizeof(body)));
    PetscCall(PetscStrlcat(body, PETSC_BOX_CLIENT_ID, sizeof(body)));
    PetscCall(PetscStrlcat(body, "&client_secret=", sizeof(body)));
    PetscCall(PetscStrlcat(body, PETSC_BOX_CLIENT_ST, sizeof(body)));
    PetscCall(PetscStrlcat(body, "&refresh_token=", sizeof(body)));
    PetscCall(PetscStrlcat(body, refreshtoken, sizeof(body)));
    if (!refresh_token) PetscCall(PetscFree(refreshtoken));
    PetscCall(PetscStrlcat(body, "&grant_type=refresh_token", sizeof(body)));

    PetscCall(PetscHTTPSRequest("POST", "www.box.com/api/oauth2/token", NULL, "application/x-www-form-urlencoded", body, ssl, buff, sizeof(buff)));
    PetscCall(PetscSSLDestroyContext(ctx));
    close(sock);

    PetscCall(PetscPullJSONValue(buff, "access_token", access_token, tokensize, &found));
    PetscCheck(found, PETSC_COMM_SELF, PETSC_ERR_LIB, "Box did not return access token");
    PetscCall(PetscPullJSONValue(buff, "refresh_token", new_refresh_token, tokensize, &found));
    PetscCheck(found, PETSC_COMM_SELF, PETSC_ERR_LIB, "Box did not return refresh token");

    PetscCall(PetscPrintf(comm, "Here is your new Box refresh token, save it in a save place, in the future you can run PETSc\n"));
    PetscCall(PetscPrintf(comm, "programs with the option -box_refresh_token %s\n", new_refresh_token));
    PetscCall(PetscPrintf(comm, "to access Box Drive automatically\n"));
  }
  PetscFunctionReturn(PETSC_SUCCESS);
}

#include <sys/stat.h>

/*@C
     PetscBoxUpload - Loads a file to the Box Drive

     This routine has not yet been written; it is just copied from Google Drive

     Not collective, only the first process in the `MPI_Comm` uploads the file

  Input Parameters:
+   comm - MPI communicator
.   access_token - obtained with `PetscBoxRefresh()`, pass NULL to have PETSc generate one
-   filename - file to upload; if you upload multiple times it will have different names each time on Box Drive

  Options Database Key:
.  -box_refresh_token XXX - the token value

  Usage Patterns:
.vb
    With PETSc option -box_refresh_token XXX given
    PetscBoxUpload(comm,NULL,filename);        will upload file with no user interaction

    Without PETSc option -box_refresh_token XXX given
    PetscBoxUpload(comm,NULL,filename);        for first use will prompt user to authorize access to Box Drive with their processor

    With PETSc option -box_refresh_token  XXX given
    PetscBoxRefresh(comm,NULL,access_token,sizeof(access_token));
    PetscBoxUpload(comm,access_token,filename);

    With refresh token entered in some way by the user
    PetscBoxRefresh(comm,refresh_token,access_token,sizeof(access_token));
    PetscBoxUpload(comm,access_token,filename);

    PetscBoxAuthorize(comm,access_token,refresh_token,sizeof(access_token));
    PetscBoxUpload(comm,access_token,filename);
.ve

   Level: intermediate

.seealso: `PetscURLShorten()`, `PetscBoxAuthorize()`, `PetscBoxRefresh()`
@*/
PetscErrorCode PetscBoxUpload(MPI_Comm comm, const char access_token[], const char filename[])
{
  SSL_CTX    *ctx;
  SSL        *ssl;
  int         sock;
  char        head[1024], buff[8 * 1024], *body, *title;
  PetscMPIInt rank;
  struct stat sb;
  size_t      len, blen, rd;
  FILE       *fd;
  int         err;

  PetscFunctionBegin;
  PetscCallMPI(MPI_Comm_rank(comm, &rank));
  if (rank == 0) {
    PetscCall(PetscStrncpy(head, "Authorization: Bearer ", sizeof(head)));
    PetscCall(PetscStrlcat(head, access_token, sizeof(head)));
    PetscCall(PetscStrlcat(head, "\r\n", sizeof(head)));
    PetscCall(PetscStrlcat(head, "uploadType: multipart\r\n", sizeof(head)));

    err = stat(filename, &sb);
    PetscCheck(!err, PETSC_COMM_SELF, PETSC_ERR_FILE_OPEN, "Unable to stat file: %s", filename);
    len = 1024 + sb.st_size;
    PetscCall(PetscMalloc1(len, &body));
    PetscCall(PetscStrncpy(body,
                           "--foo_bar_baz\r\n"
                           "Content-Type: application/json\r\n\r\n"
                           "{",
                           len));
    PetscCall(PetscPushJSONValue(body, "title", filename, len));
    PetscCall(PetscStrlcat(body, ",", len));
    PetscCall(PetscPushJSONValue(body, "mimeType", "text.html", len));
    PetscCall(PetscStrlcat(body, ",", len));
    PetscCall(PetscPushJSONValue(body, "description", "a file", len));
    PetscCall(PetscStrlcat(body,
                           "}\r\n\r\n"
                           "--foo_bar_baz\r\n"
                           "Content-Type: text/html\r\n\r\n",
                           len));
    PetscCall(PetscStrlen(body, &blen));
    fd = fopen(filename, "r");
    PetscCheck(fd, PETSC_COMM_SELF, PETSC_ERR_FILE_OPEN, "Unable to open file: %s", filename);
    rd = fread(body + blen, sizeof(unsigned char), sb.st_size, fd);
    PetscCheck(rd == (size_t)sb.st_size, PETSC_COMM_SELF, PETSC_ERR_FILE_OPEN, "Unable to read entire file: %s %d %d", filename, (int)rd, (int)sb.st_size);
    fclose(fd);
    body[blen + rd] = 0;
    PetscCall(PetscStrlcat(body,
                           "\r\n\r\n"
                           "--foo_bar_baz\r\n",
                           len));
    PetscCall(PetscSSLInitializeContext(&ctx));
    PetscCall(PetscHTTPSConnect("www.boxapis.com", 443, ctx, &sock, &ssl));
    PetscCall(PetscHTTPSRequest("POST", "www.boxapis.com/upload/drive/v2/files/", head, "multipart/related; boundary=\"foo_bar_baz\"", body, ssl, buff, sizeof(buff)));
    PetscCall(PetscFree(body));
    PetscCall(PetscSSLDestroyContext(ctx));
    close(sock);
    PetscCall(PetscStrstr(buff, "\"title\"", &title));
    PetscCheck(title, PETSC_COMM_SELF, PETSC_ERR_LIB, "Upload of file %s failed", filename);
  }
  PetscFunctionReturn(PETSC_SUCCESS);
}