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/* This file is part of Eclat.
   Copyright (C) 2012, 2013 Sergey Poznyakoff.
 
   Eclat is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3, or (at your option)
   any later version.
 
   Eclat is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
 
   You should have received a copy of the GNU General Public License
   along with Eclat.  If not, see <http://www.gnu.org/licenses/>. */

#include "eclat.h"

char *conffile = SYSCONFDIR "/eclat.conf" ;
int lint_mode;
int dry_run_mode;
int match_command_mode;
int preprocess_only = 0;

char *endpoint = "ec2.amazonaws.com";
char *signature_version = "2";
char *access_key;
char *secret_key;
char *region_name;
int use_ssl;
int ssl_verify_peer = 1;
char *ssl_ca_file;
char *ssl_ca_path;
char *format_expr_option;
char *format_file_option;
char *format_name_option;
int sort_option;
char *format_file;
char *test_map_name;
enum eclat_confirm_mode confirm_mode;
int translate_option = -1;

FILE *xml_dump_file;


static char *categories[] = {
	"main",
	"cfgram",
	"cflex",
	"conf",
	"curl",
};

static void
debug_init()
{
	int i;

	for (i = 0; i < sizeof(categories)/sizeof(categories[0]); i++)
		debug_register(categories[i]);
}


static int
node_ident_cmp(struct grecs_node const *a, struct grecs_node const *b)
{
        return strcmp(a->ident, b->ident);
}

void listcmd(char *fmt);

#include "cmdline.h"

#define CMD_MOD   0x01
#define CMD_DESTR 0x02
#define CMD_NOQRY 0x04

struct eclat_command cmdtab[] = {
	{ "start", "start-instances",  "StartInstances", eclat_start_instance,
	  CMD_MOD },
	{ "stop", "stop-instances",   "StopInstances",  eclat_stop_instance,
	  CMD_MOD },
	{ "reboot", "reboot-instances", "RebootInstances",  eclat_reboot_instance,
	  CMD_MOD },
	{ "lsaddr", "describe-addresses", "DescribeAddresses",
	  eclat_describe_addresses },
	{ "lstag", "describe-tags",    "DescribeTags",   eclat_describe_tags },
	{ "lsiattr", "describe-instance-attribute", "DescribeInstanceAttribute",
	  eclat_describe_instance_attribute },
	{ "lsistat", "describe-instance-status", "DescribeInstanceStatus",
	  eclat_describe_instance_status },
	{ "lsinst", "describe-instances", "DescribeInstances",
	  eclat_describe_instances },
	{ "lsvol", "describe-volumes", "DescribeVolumes",
	  eclat_describe_volumes },
	{ "mkaddr", "allocate-address", "AllocateAddress",
	  eclat_allocate_address, CMD_MOD },
	{ "rmaddr", "release-address", "ReleaseAddress",
	  eclat_release_address, CMD_MOD|CMD_DESTR },
	{ "assocaddr", "associate-address", "AssociateAddress",
	  eclat_associate_address, CMD_MOD },
	{ "disasaddr", "disassociate-address", "DisassociateAddress",
	  eclat_disassociate_address, CMD_MOD },
	{ "mktag", "create-tags", "CreateTags",
	  eclat_create_tags, CMD_MOD },
	{ "rmtag", "delete-tags", "DeleteTags",
	  eclat_delete_tags, CMD_MOD|CMD_DESTR },
	{ "dmesg", "get-console-output", "GetConsoleOutput",
	  eclat_get_console_output },
	{ "lssg", "describe-security-groups", "DescribeSecurityGroups",
	  eclat_describe_security_groups },
	{ "mksnap", "create-snapshot", "CreateSnapshot",
	  eclat_create_snapshot },
	{ "lssnap", "describe-snapshots", "DescribeSnapshots",
	  eclat_describe_snapshots },
	{ "lssattr", "describe-snapshot-attribute", "DescribeSnapshotAttribute",
	  eclat_describe_snapshot_attribute },
	{ "setsattr", "modify-snapshot-attribute", "ModifySnapshotAttribute",
	  eclat_modify_snapshot_attribute, CMD_MOD },
	{ "clrsattr", "reset-snapshot-attribute", "ResetSnapshotAttribute",
	  eclat_reset_snapshot_attribute, CMD_MOD|CMD_DESTR },
	{ "rmsnap", "delete-snapshot", "DeleteSnapshot",
	  eclat_delete_snapshot, CMD_MOD|CMD_DESTR },
	{ "lszon", "describe-availability-zones", "DescribeAvailabilityZones",
	  eclat_describe_avaialbility_zones },
	{ "lsreg", "describe-regions", "DescribeRegions",
	  eclat_describe_regions },
	{ "mkvol", "create-volume", "CreateVolume",
	  eclat_create_volume, CMD_MOD },
	{ "rmvol", "delete-volume", "DeleteVolume",
	  eclat_delete_volume, CMD_MOD|CMD_DESTR },
	{ "atvol", "attach-volume", "AttachVolume",
	  eclat_attach_volume, CMD_MOD },
	{ "devol", "detach-volume", "DetachVolume",
	  eclat_detach_volume, CMD_MOD|CMD_DESTR },
	{ "setiattr", "modify-instance-attribute", "ModifyInstanceAttribute",
	  eclat_modify_instance_attribute, CMD_MOD },
	{ "lsimg", "describe-images", "DescribeImages",
	  eclat_describe_images },
	{ "mkinst", "run-instances", "RunInstances",
	  eclat_run_instances, CMD_MOD },
	{ "mkimg", "create-image", "CreateImage",
	  eclat_create_image, CMD_MOD },
	{ "deimg", "deregister-image", "DeregisterImage",
	  eclat_deregister_image, CMD_MOD|CMD_DESTR },
	{ "cpimg", "copy-image", "CopyImage",
	  eclat_copy_image },
	{ "cpsnap", "copy-snapshot", "CopySnapshot",
	  eclat_copy_snapshot },
	{ "lsattr", NULL, NULL,
	  eclat_lsattr, CMD_NOQRY },
	{ "sg", NULL, NULL, eclat_sg },
	{ "mksg", "create-security-group", "CreateSecurityGroup",
	  eclat_create_security_group },
	{ "rmsg", "delete-security-group", "DeleteSecurityGroup",
	  eclat_delete_security_group, CMD_MOD|CMD_DESTR }
};
size_t cmdcnt = sizeof(cmdtab) / sizeof(cmdtab[0]);

static int
cmdcmp(const void *a, const void *b)
{
	struct eclat_command const *cmda = a;
	struct eclat_command const *cmdb = b;
	if (cmda->name && cmdb->name)
		return strcmp(cmda->name, cmdb->name);
	else if (cmda->ident && cmdb->ident)
		return strcmp(cmda->ident, cmdb->ident);
	else if (cmda->ident || cmda->name)
		return 127;
	else if (cmdb->ident || cmdb->name)
		return -127;
	return 0;
}

static void
sortcmds()
{
	qsort(cmdtab, cmdcnt, sizeof(cmdtab[0]), cmdcmp);
}

/* Format:

   %[pfx:][sfx][ni]

   For example, to format the table of available commands for doc/eclat.1:

      eclat -l '\t\\fB%n\\fR\t\\fB%i\\fR\n'

   To format a "see also" list of commands (ibidem):
   
      eclat -l '%.BR eclat-: (1)n,\n'
*/

int
parsespec(char *start, char **endp, char *fchr, char *s[], int l[])
{
	char *p;
	int n = 0;

	++start;
	s[0] = start;
	s[1] = NULL;
	l[0] = l[1] = 0;
	for (p = start; *p; p++) {
		if (*p == ':' || strchr(fchr, *p)) {
			if (n > 1)
				return -1;
			l[n++] = p - start;
			if (*p != ':') {
				*endp = p + 1;
				return *p;
			}
			if (n == 1)
				s[n] = start = p + 1;
		}
	}
	return -1;
}

void
fmtstr(const char *str, int len)
{
	while (len--) {
		int c = *str++;
		if (c == '\\') {
			if (len) {
				len--;
				c = wordsplit_c_unquote_char(*str++);
			}
		}
		fputc(c, stdout);
	}
}

void
listcmd(char *fmt)
{
	struct eclat_command *cp;
	
	for (cp = cmdtab; cp < cmdtab + cmdcnt; cp++) {
		char *p = fmt;
		char *start = fmt;
		char *end;
		char *s[2];
		int l[2];
		const char *str;
		
		while (*p) {
			if (*p == '%') {
				switch (parsespec(p, &end, "ni", s, l)) {
				case 'n':
					str = cp->name;
					break;
				case 'i':
					str = cp->ident;
					break;
				default:
					p++;
					continue;
				}

				if (str) {
					if (p != start)
						fmtstr(start, p - start);
					fmtstr(s[0], l[0]);
					printf("%s", str);
					fmtstr(s[1], l[1]);
				}
				start = p = end;
			} else {
				p++;
			}
		}
		if (p != start)
			fmtstr(start, p - start);
	}
}

void
listcmdhook()
{
	struct eclat_command *cp;

	printf("Available commands\n");
	printf("Eclat name   EC2 Name\n");
	printf("-----------+---------\n");
	for (cp = cmdtab; cp < cmdtab + cmdcnt; cp++) {
		printf("  %-10s", cp->name ? cp->name : "");
		if (cp->ident)
			printf (" %s", cp->ident);
		putchar ('\n');
	}

	printf("\nRun \"%s COMMAND --help\" to get help on a particular command.\n",
		program_name);
	
	putchar('\n');
}


#define NO_MATCH      0
#define EXACT_MATCH   1
#define PARTIAL_MATCH 2

static int
ident_matches(const char *p, const char *q)
{
	int match = EXACT_MATCH;
	
	for (;; p++, q++) {
		if (*p == 0)
			return *q == 0 ? match : NO_MATCH;
		else if (*q == 0)
			return PARTIAL_MATCH;
		else if (*p == *q)
			continue;
		else if (*q == '-') {
			for (; *p != '-'; p++)
				if (!*p)
					return NO_MATCH;
			match = PARTIAL_MATCH;
		} else
			break;
	}
	return NO_MATCH;
}	

struct eclat_command *
find_command_name(const char *name)
{
	struct eclat_command *cp, *match = NULL;
	
	for (cp = cmdtab; cp < cmdtab + cmdcnt; cp++) {
		if (cp->name && strcmp(cp->name, name) == 0)
			return cp;
		if (!cp->ident)
			continue;
		switch (ident_matches(cp->ident, name)) {
		case NO_MATCH:
			break;
		case EXACT_MATCH:
			return cp;
		case PARTIAL_MATCH:
			if (!match)
				match = cp;
			else {
				/* Second match */
				err("ambiguous command %s:", name);
				err("  %s", match->ident);
				err("  %s", cp->ident);
				while (++cp < cmdtab + cmdcnt)
					if (ident_matches(cp->ident, name) !=
					    NO_MATCH)
						err("  %s", cp->ident);
				exit(EX_USAGE);
			}
		}
	}
	return match;
}

static void
print_matching_commands(const char *pat)
{
	struct eclat_command *cp;
	size_t patlen = strlen (pat);
	
	for (cp = cmdtab; cp < cmdtab + cmdcnt; cp++) {
		if (cp->name && strlen(cp->name) >= patlen &&
		    memcmp(cp->name, pat, patlen) == 0)
			printf("%s\n", cp->name);
		if (cp->ident && ident_matches(cp->ident, pat) != NO_MATCH)
			printf("%s\n", cp->ident);
	}
}

struct eclat_command *
find_command_tag(const char *tag)
{
	struct eclat_command *cp;

	for (cp = cmdtab; cp < cmdtab + cmdcnt; cp++) {
		if (eclat_actcmp(cp->tag, tag) == 0)
			return cp;
	}
	return NULL;
}

void
set_command_confirmation(const char *name, enum eclat_confirm_mode cfmode,
			 grecs_locus_t *locus)
{
	struct eclat_command *cp;
	int flag = 0;
	
	if (strcmp(name, "all") == 0)
		flag = CMD_MOD;
	else if (strcmp(name, "destructive") == 0)
		flag = CMD_DESTR;
	else {
		cp = find_command_tag(name);
	
		if (!cp)
			grecs_error(locus, 0, "unknown command or class");
		else
			cp->confirm = cfmode;
		return;
	}
	
	for (cp = cmdtab; cp < cmdtab + cmdcnt; cp++) {
		if (cp->flags & flag)
			cp->confirm = cfmode;
	}
}

void
set_command_format(const char *name, const char *format, grecs_locus_t *locus)
{
	struct eclat_command *cp = find_command_tag(name);

	if (!cp) {
		grecs_error(locus, 0, "unknown command");
		return;
	}

	if (cp->fmt) {
		grecs_error(locus, 0, "format %s redefined", name);
		grecs_error(&cp->locus, 0, "this is the location of "
			    "the previous definition");
		free(cp->fmt);
	}

	cp->fmt = grecs_strdup(format);
	cp->locus = *locus;
}

forlan_eval_env_t 
compile_format_file(const char *fmtfile)
{
	forlan_eval_env_t env;
	FILE *fp;
	struct grecs_locus_point pt;
	
	fp = fopen(fmtfile, "r");
	if (!fp)
		die(EX_UNAVAILABLE, "cannot open format file \"%s\": %s",
		    fmtfile, strerror(errno));

	pt.file = (char*) fmtfile;
	pt.line = 1;
	pt.col = 0;

	env = forlan_parse_file(fp, &pt);
	fclose(fp);
	if (!env)
		exit(EX_UNAVAILABLE);
	
	return env;
}


struct filter_descr *available_filters;

static char *aws_typestr[] = {
	"String",
	"dateType",
	"Boolean",
	"Integer"
};

void
list_filters(FILE *fp)
{
	struct filter_descr *flt;
	size_t ncols = get_scr_cols();
	size_t col, start;
	
	fprintf(fp, "Available filters are:\n");
	for (flt = available_filters; flt->name; flt++) {
		col = fprintf(fp, " %-24s ", flt->name);
		if (col > 26) {
			col = start = 26;
			fprintf(fp, "\n%*.*s", (int)start, (int)start, "");
		}
		if (flt->type != FILTER_ENUM)
			fprintf(fp, "%s", aws_typestr[flt->type]);
		else {
			int i;
			char *delim;
			size_t len;
			
			col += fprintf(fp, "One of:");
			start = col + 1;
			delim = " ";
			for (i = 0; flt->avail[i]; i++) {
				len = strlen(delim) + strlen(flt->avail[i]);
				if (col + len >= ncols) {
					fprintf(fp, ",\n%*.*s",
						(int)start, (int)start, "");
					col = start;
					delim = "";
				}
				col += fprintf(fp, "%s%s", delim,
					       flt->avail[i]);
				delim = ", ";
			}
		}
		fputc('\n', fp);
	}
	fputc('\n', fp);
}

struct format_defn {
	const char *name;
	char *text;
	grecs_locus_t locus;
};

static struct grecs_symtab *format_table;

void
define_format(const char *name, const char *fmt, grecs_locus_t *loc)
{
	struct format_defn key;
	struct format_defn *ent;
	int install = 1;

	if (!format_table) {
		format_table = grecs_symtab_create_default(
			              sizeof(struct format_defn));
		if (!format_table)
			grecs_alloc_die();
	}
  
	key.name = (char*) name;
	ent = grecs_symtab_lookup_or_install(format_table, &key, &install);
	if (!ent)
		grecs_alloc_die();
	if (!install) {
		grecs_error(loc, 0, "redefinition of format \"%s\"", name);
		grecs_error(&ent->locus, 0,
			    "this is the place of the original definition");
		free(ent->text);
	}
	ent->text = grecs_strdup(fmt);
	ent->locus = *loc;
}

forlan_eval_env_t
find_format(const char *name)
{
	struct format_defn key;
	struct format_defn *defn;
	forlan_eval_env_t env;
	
	if (!format_table)
		return NULL;
	key.name = (char*) name;
	defn = grecs_symtab_lookup_or_install(format_table, &key, NULL);
	if (!defn)
		return NULL;
		
	env = forlan_parse_buffer(defn->text, strlen(defn->text),
				  &defn->locus.beg);
	return env;
}

static forlan_eval_env_t
read_format(struct eclat_command *cmd)
{
	forlan_eval_env_t env = NULL;

	if (format_expr_option) {
		struct grecs_locus_point pt;

		pt.file = "<tty>";
		pt.line = 1;
		pt.col = 0;

		env = forlan_parse_buffer(format_expr_option,
					  strlen(format_expr_option),
					  &pt);
	} else if (format_file_option)
		env = compile_format_file(format_file_option);
	else if (format_name_option)
		env = find_format(format_name_option);
	else if (!cmd)
		return NULL;
	else if (cmd->fmt)
		env = forlan_parse_buffer(cmd->fmt, strlen(cmd->fmt),
					  &cmd->locus.beg);
	else if (format_file) {
		const char *kwe[5];
		struct grecs_locus_point pt;
		FILE *fp;
		char *filename;
		
		kwe[0] = "command";
		kwe[1] = cmd->ident ? cmd->ident : cmd->name;
		kwe[2] = "action";
		kwe[3] = cmd->tag;
		kwe[4] = NULL;

		filename = eclat_expand_kw(format_file, kwe);
		fp = fopen(filename, "r");
		if (!fp) {
			if (errno == ENOENT) {
				debug(ECLAT_DEBCAT_MAIN, 1,
				      ("cannot open format source \"%s\": %s",
				       filename, strerror(errno)));
				free(filename);
				return NULL;
			}
			die(EX_UNAVAILABLE,
			    "cannot open format file %s: %s",
			    filename, strerror(errno));
		}
		
		pt.file = filename;
		pt.line = 1;
		pt.col = 0;

		env = forlan_parse_file(fp, &pt);
		fclose(fp);
		free(filename);
	} else
		return NULL;
	
	if (!env)
		exit(EX_UNAVAILABLE);
	return env;
}

int
eclat_do_command(eclat_command_env_t *env, struct eclat_command *command,
		 int argc, char **argv)
{
	int rc;
	
	if (!(command->flags & CMD_NOQRY)) {
		env->query = eclat_query_create(use_ssl ? EC2_QF_HTTPS : 0,
						endpoint, "/");
	}

	if (command->tag)
		eclat_query_add_param(env->query, "Action", command->tag);
		
	rc = command->handler(env, argc, argv);
			
	if (rc == 0 && !(command->flags & CMD_NOQRY)) {
		if (!eclat_confirm(confirm_mode,
				   "Proceed with %s", command->ident))
			die(EX_CANCELLED, "command not confirmed");
		rc = eclat_send_query(env->curl, env->query);
	}
	return rc;
}

int
main(int argc, char **argv)
{
	int rc;
	struct grecs_node *tree;
	struct eclat_io *io;
	struct grecs_node *xmltree;
	forlan_eval_env_t env = NULL;
	struct eclat_command *command = NULL; 
	eclat_command_env_t cmdenv;
	
	set_program_name(argv[0]);
	proginfo.print_help_hook = listcmdhook;
	debug_init();
	forlan_init();
	eclat_map_init();
	eclat_map_drv_register(&eclat_map_drv_null);
	eclat_map_drv_register(&eclat_map_drv_file);
	eclat_map_drv_register(&eclat_map_drv_seq);
	eclat_map_drv_register(&eclat_map_drv_bidi);
#ifdef WITH_GDBM
	eclat_map_drv_register(&eclat_map_drv_gdbm);
#endif
#ifdef WITH_LDAP
	eclat_map_drv_register(&eclat_map_drv_ldap);
#endif
	eclat_map_drv_register(&eclat_map_drv_ec2);
	sortcmds();
	config_init();
	parse_options(&argc, &argv);

	if (match_command_mode) {
		if (argc > 1)
			die(EX_USAGE, "wrong number of arguments");
		print_matching_commands(argc == 1 ? argv[0] : "");
		return 0;
	}
	
	if (argc && !test_map_name) {
		command = find_command_name(argv[0]);
		if (!command)
			die(EX_USAGE, "unrecognized command");
	}
	
	grecs_gram_trace(debug_level(ECLAT_DEBCAT_CFGRAM));
	grecs_lex_trace(debug_level(ECLAT_DEBCAT_CFLEX));

	if (preprocess_only)
		exit(grecs_preproc_run(conffile, grecs_preprocessor) ?
		     EX_CONFIG : 0);

	if (access(conffile, R_OK) == 0) {
		tree = grecs_parse(conffile);
		if (!tree)
			exit(EX_CONFIG);
		config_finish(tree);
		/* Prevent texttab from being freed by grecs_tree_free.
		   FIXME: A dirty kludge, needed to preserve file names
		   in locus structures. A proper solution would be to have
		   our own texttab for that purpose. */
		tree->v.texttab = NULL;
		grecs_tree_free(tree);
	} else if (errno == ENOENT) {
		warn("no configuration file");
		run_config_finish_hooks();
	} else
		die(errno == EACCES ? EX_NOPERM : EX_OSFILE,
		    "cannot access \"%s\": %s",
		    conffile, strerror(errno));

	if (translate_option != -1)
		translation_enabled = translate_option;
	
	if (test_map_name) {
		int i;

		if (argc < 1)
			die(EX_USAGE, "wrong number of arguments");
		translate_ids(argc, argv, test_map_name);
		for (i = 0; i < argc; i++) {
			printf("%s\n", argv[i]);
		}
		return 0;
	}

	env = read_format(command);
	
	if (lint_mode)
		exit(0);

	if (!command)
		die(EX_USAGE, "no command given");

	if (region_name) {
		endpoint = region_to_endpoint(region_name);
		if (!endpoint) 			
			die(EX_USAGE,
			    "cannot find endpoint for region %s", region_name);
	}
	
	if (!secret_key) {
		if (get_access_creds(access_key, &access_key, &secret_key))
			die(EX_UNAVAILABLE,
			    "cannot find authentication credentials");
	}
	debug(ECLAT_DEBCAT_MAIN, 1, ("using access key %s", access_key));

	io = eclat_io_init(1);
	
	if (confirm_mode == eclat_confirm_unspecified)
		confirm_mode = command->confirm;

	/* Prepare environment */
	memset(&cmdenv, 0, sizeof(cmdenv));
	cmdenv.cmd = command;
	cmdenv.curl = io->curl;
	
	rc = eclat_do_command(&cmdenv, command, argc, argv);
	if (rc)
		exit(rc);
	
	xmltree = eclat_io_finish(io);

	if (xml_dump_file)
		fclose(xml_dump_file);
	
	if (sort_option)
		grecs_tree_sort(xmltree, node_ident_cmp);
	
	if (dry_run_mode)
		/* nothing */;
	else if (env) {
		rc = forlan_run(env, xmltree);
	} else {
		grecs_print_node(xmltree, GRECS_NODE_FLAG_DEFAULT, stdout);
		fputc('\n', stdout);
	}
	
	eclat_map_free_all();
	
	exit(rc);
}

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