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#include "cmd.h"
#include "conf.h"
#include "acl.h"
#include "client.h"
#include "pool.h"
#include "worker.h"
#include "http.h"
#include "server.h"
#include "slog.h"

#include "formats/json.h"
#include "formats/raw.h"
#ifdef MSGPACK
#include "formats/msgpack.h"
#endif
#include "formats/custom-type.h"

#include <stdlib.h>
#include <string.h>
#include <hiredis/hiredis.h>
#include <hiredis/async.h>
#include <ctype.h>

struct cmd *
cmd_new(int count) {

struct cmd *c = calloc(1, sizeof(struct cmd));

c->count = count;

c->argv = calloc(count, sizeof(char*));
c->argv_len = calloc(count, sizeof(size_t));

return c;
}


void
cmd_free(struct cmd *c) {

int i;
if(!c) return;

for(i = 0; i < c->count; ++i) {
free((char*)c->argv[i]);
}

free(c->jsonp);
free(c->separator);
free(c->if_none_match);
if(c->mime_free) free(c->mime);

if (c->ac && /* we have a connection */
(c->database != c->w->s->cfg->database /* custom DB */
|| cmd_is_subscribe(c))) {
pool_free_context(c->ac);
}
free(c->argv);
free(c->argv_len);

free(c);
}

/* taken from libevent */
static char *
decode_uri(const char *uri, size_t length, size_t *out_len, int always_decode_plus) {
char c;
size_t i, j;
int in_query = always_decode_plus;

char *ret = malloc(length);

for (i = j = 0; i < length; i++) {
c = uri[i];
if (c == '?') {
in_query = 1;
} else if (c == '+' && in_query) {
c = ' ';
} else if (c == '%' && isxdigit((unsigned char)uri[i+1]) &&
isxdigit((unsigned char)uri[i+2])) {
char tmp[] = { uri[i+1], uri[i+2], '\0' };
c = (char)strtol(tmp, NULL, 16);
i += 2;
}
ret[j++] = c;
}
*out_len = (size_t)j;

return ret;
}

/* setup headers */
void
cmd_setup(struct cmd *cmd, struct http_client *client) {

int i;
cmd->keep_alive = client->keep_alive;
cmd->w = client->w; /* keep track of the worker */

for(i = 0; i < client->header_count; ++i) {
if(strcasecmp(client->headers[i].key, "If-None-Match") == 0) {
cmd->if_none_match = calloc(1+client->headers[i].val_sz, 1);
memcpy(cmd->if_none_match, client->headers[i].val,
client->headers[i].val_sz);
} else if(strcasecmp(client->headers[i].key, "Connection") == 0 &&
strcasecmp(client->headers[i].val, "Keep-Alive") == 0) {
cmd->keep_alive = 1;
}
}

if(client->type) { /* transfer pointer ownership */
cmd->mime = client->type;
cmd->mime_free = 1;
client->type = NULL;
}

if(client->jsonp) { /* transfer pointer ownership */
cmd->jsonp = client->jsonp;
client->jsonp = NULL;
}

if(client->separator) { /* transfer pointer ownership */
cmd->separator = client->separator;
client->separator = NULL;
}

if(client->filename) { /* transfer pointer ownership */
cmd->filename = client->filename;
client->filename = NULL;
}

cmd->fd = client->fd;
cmd->http_version = client->http_version;
}


cmd_response_t
cmd_run(struct worker *w, struct http_client *client,
const char *uri, size_t uri_len,
const char *body, size_t body_len) {

char *qmark = memchr(uri, '?', uri_len);
char *slash;
const char *p, *cmd_name = uri;
int cmd_len;
int param_count = 0, cur_param = 1;

struct cmd *cmd;
formatting_fun f_format;

/* count arguments */
if(qmark) {
uri_len = qmark - uri;
}
for(p = uri; p && p < uri + uri_len; param_count++) {
p = memchr(p+1, '/', uri_len - (p+1-uri));
}

if(body && body_len) { /* PUT request */
param_count++;
}
if(param_count == 0) {
return CMD_PARAM_ERROR;
}

cmd = cmd_new(param_count);
cmd->fd = client->fd;
cmd->database = w->s->cfg->database;

/* get output formatting function */
uri_len = cmd_select_format(client, cmd, uri, uri_len, &f_format);

/* add HTTP info */
cmd_setup(cmd, client);

/* check if we only have one command or more. */
slash = memchr(uri, '/', uri_len);
if(slash) {

/* detect DB number by checking if first arg is only numbers */
int has_db = 1;
int db_num = 0;
for(p = uri; p < slash; ++p) {
if(*p < '0' || *p > '9') {
has_db = 0;
break;
}
db_num = db_num * 10 + (*p - '0');
}

/* shift to next arg if a db was set up */
if(has_db) {
char *next;
cmd->database = db_num;
cmd->count--; /* overcounted earlier */
cmd_name = slash + 1;

if((next = memchr(cmd_name, '/', uri_len - (slash - uri)))) {
cmd_len = next - cmd_name;
} else {
cmd_len = uri_len - (slash - uri + 1);
}
} else {
cmd_len = slash - uri;
}
} else {
cmd_len = uri_len;
}

/* there is always a first parameter, it's the command name */
cmd->argv[0] = malloc(cmd_len);
memcpy(cmd->argv[0], cmd_name, cmd_len);
cmd->argv_len[0] = cmd_len;

/* check that the client is able to run this command */
if(!acl_allow_command(cmd, w->s->cfg, client)) {
cmd_free(cmd);
return CMD_ACL_FAIL;
}

if(cmd_is_subscribe(cmd)) {
/* create a new connection to Redis */
cmd->ac = (redisAsyncContext*)pool_connect(w->pool, cmd->database, 0);

/* register with the client, used upon disconnection */
client->pub_sub = cmd;
cmd->pub_sub_client = client;
} else if(cmd->database != w->s->cfg->database) {
/* create a new connection to Redis for custom DBs */
cmd->ac = (redisAsyncContext*)pool_connect(w->pool, cmd->database, 0);
} else {
/* get a connection from the pool */
cmd->ac = (redisAsyncContext*)pool_get_context(w->pool);
}

/* no args (e.g. INFO command) */
if(!slash) {
if(!cmd->ac) {
cmd_free(cmd);
return CMD_REDIS_UNAVAIL;
}
redisAsyncCommandArgv(cmd->ac, f_format, cmd, 1,
(const char **)cmd->argv, cmd->argv_len);
return CMD_SENT;
}
p = cmd_name + cmd_len + 1;
while(p < uri + uri_len) {

const char *arg = p;
int arg_len;
char *next = memchr(arg, '/', uri_len - (arg-uri));
if(!next || next > uri + uri_len) { /* last argument */
p = uri + uri_len;
arg_len = p - arg;
} else { /* found a slash */
arg_len = next - arg;
p = next + 1;
}

/* record argument */
cmd->argv[cur_param] = decode_uri(arg, arg_len, &cmd->argv_len[cur_param], 1);
cur_param++;
}

if(body && body_len) { /* PUT request */
cmd->argv[cur_param] = malloc(body_len);
memcpy(cmd->argv[cur_param], body, body_len);
cmd->argv_len[cur_param] = body_len;
}

/* send it off! */
if(cmd->ac) {
cmd_send(cmd, f_format);
return CMD_SENT;
}
/* failed to find a suitable connection to Redis. */
cmd_free(cmd);
client->pub_sub = NULL;
return CMD_REDIS_UNAVAIL;
}

void
cmd_send(struct cmd *cmd, formatting_fun f_format) {
redisAsyncCommandArgv(cmd->ac, f_format, cmd, cmd->count,
(const char **)cmd->argv, cmd->argv_len);
}

/**
* Select Content-Type and processing function.
*/
int
cmd_select_format(struct http_client *client, struct cmd *cmd,
const char *uri, size_t uri_len, formatting_fun *f_format) {

const char *ext;
int ext_len = -1;
unsigned int i;
int found = 0; /* did we match it to a predefined format? */

/* those are the available reply formats */
struct reply_format {
const char *s;
size_t sz;
formatting_fun f;
const char *ct;
};
struct reply_format funs[] = {
{.s = "json", .sz = 4, .f = json_reply, .ct = "application/json"},
{.s = "raw", .sz = 3, .f = raw_reply, .ct = "binary/octet-stream"},

#ifdef MSGPACK
{.s = "msg", .sz = 3, .f = msgpack_reply, .ct = "application/x-msgpack"},
#endif

{.s = "bin", .sz = 3, .f = custom_type_reply, .ct = "binary/octet-stream"},
{.s = "txt", .sz = 3, .f = custom_type_reply, .ct = "text/plain"},
{.s = "html", .sz = 4, .f = custom_type_reply, .ct = "text/html"},
{.s = "xhtml", .sz = 5, .f = custom_type_reply, .ct = "application/xhtml+xml"},
{.s = "xml", .sz = 3, .f = custom_type_reply, .ct = "text/xml"},

{.s = "png", .sz = 3, .f = custom_type_reply, .ct = "image/png"},
{.s = "jpg", .sz = 3, .f = custom_type_reply, .ct = "image/jpeg"},
{.s = "jpeg", .sz = 4, .f = custom_type_reply, .ct = "image/jpeg"},

{.s = "js", .sz = 2, .f = json_reply, .ct = "application/javascript"},
{.s = "css", .sz = 3, .f = custom_type_reply, .ct = "text/css"},
};

/* default */
*f_format = json_reply;

/* find extension */
for(ext = uri + uri_len - 1; ext != uri && *ext != '/'; --ext) {
if(*ext == '.') {
ext++;
ext_len = uri + uri_len - ext;
break;
}
}
if(!ext_len) return uri_len; /* nothing found */

/* find function for the given extension */
for(i = 0; i < sizeof(funs)/sizeof(funs[0]); ++i) {
if(ext_len == (int)funs[i].sz && strncmp(ext, funs[i].s, ext_len) == 0) {

if(cmd->mime_free) free(cmd->mime);
cmd->mime = (char*)funs[i].ct;
cmd->mime_free = 0;

*f_format = funs[i].f;
found = 1;
}
}

/* the user can force it with ?type=some/thing */
if(client->type) {
*f_format = custom_type_reply;
cmd->mime = strdup(client->type);
cmd->mime_free = 1;
}

if(found) {
return uri_len - ext_len - 1;
} else {
/* no matching format, use default output with the full argument, extension included. */
return uri_len;
}
}

int
cmd_is_subscribe(struct cmd *cmd) {

if(cmd->count >= 1 && cmd->argv[0] &&
(strncasecmp(cmd->argv[0], "SUBSCRIBE", cmd->argv_len[0]) == 0 ||
strncasecmp(cmd->argv[0], "PSUBSCRIBE", cmd->argv_len[0]) == 0)) {
return 1;
}
return 0;
}
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