#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <unistd.h>
#include <fcntl.h>

#include "zpm.h"

#include "sha256.h"
#if 0
struct zpm {
	sqlite3 *db;
	char *path; /* path to package file */
	char *version;
	int release;
	char *pkgname;
	time_t installed; /* install time, 0 for not installed */
};

struct zpm_file {
	char *path;
	int mode;
	uint32_t filetype;
	char *tags;
	char *owner;
	char *group;
	char *hash; /* could be fixed length */
	time_t mtime;
	struct zpm_file *next; /* so you can make a linked list */
};

/* NULL?  Create? */
/* associate with a package ? if only one?  first? */
int zpm_open(struct zpm *pkg, char *path);
int zpm_pkgname(char *base, char *version, int release); /* construct a package file name */

/* flags for preserving mode, owner, etc */
/* puts hash of import in hash */
/* path can be a hash, with an "INTERNAL" flag, i.e. internally import */
#define ZPM_MODE 0x1
#define ZPM_OWNER 0x2
#define ZPM_MTIME 0x4
#define ZPM_INTERNAL 0x8
#define ZPM_NOBLOB 0x10
/* don't run scripts on install */
#define ZPM_NOSCRIPTS 0x10
/* don't associate the file with a package, just do a raw insert */
/* otherwise, associate it with the current package */
#define ZPM_NOPACKAGE 0x20

int zpm_import(struct zpm *zp, char *path, uint32_t flags, uint8_t *hash);

/* link and unlink hashes to packages */
int zpm_link(struct zpm *pkg, char *path, char *hash, struct zpm_file *fileinfo);
int zpm_unlink(struct zpm *pkg, char *path);

/* tag a file.  relative to "current package" */
int zpm_tag(struct zpm *zp, char *path, char *tags);
/* should this be broken up into separage functions ? */
int zpm_md(struct zpm *zp, char *path, int mode, char *owner, char *group, time_t mtime);

/* export hash to dest */
int zpm_extract(struct zpm *pkg, char *hash, char *path, int mode);

/* export path to dest */
int zpm_export(struct zpm *zp, char *path, uint32_t flags, char *dest);

int zpm_close(struct zpm *zp);

/* attach a signature to a package */
int zpm_sign(struct zpm *z, size_t s, void *signature);

/* set the package info to the nth package, -1 to return count? */
/* further import/exports and such will be relative to this package */
int zpm_package(struct zpm *zp, int n);

/* get file information */
int zpm_stat(struct zpm *z, struct zpm_file *f, int n);

/* will also set the package context to the new package */
int zpm_newpkg(struct zpm *z, char *base, char *version, int release);

/* transactions */
int zpm_begin(struct zpm *z);
int zpm_commit(struct zpm *z);
int zpm_rollback(struct zpm *z);

/* higher level operations */

/* install or uninstall the package */
/* flag for keeping the blobs in local */
/* what about tag filtering */
int zpm_install(struct zpm *z, struct zpm *local, uint32_t flags);
int zpm_uninstall(struct zpm *local);

/* slurp up the actual blobs */
/* what about versioning them if they change */
int zpm_preserve(struct zpm *local);

/* check file integrity */
int zpm_checkinstall(struct zpm *local);

int zpm_merge(struct zpm *z, struct zpm *src, uint32_t flags);

void uncompresslzma(void *buf, size_t bufsize, FILE *out);
#define SQLERROR(x) fprintf(stderr, "%s %d: %s\n", __func__, __LINE__, (x))
#endif

static char *dupstr(char *s) {
	size_t n;
	char *d;

	n = strlen(s);
	d = malloc(n+1);
	if (d) {
		d = strcpy(d, s);
	}
	return d;
}

#if 0
int zpm_newpkg(struct zpm *z, char *base, char *version, int release) {
	char *sql = "insert or ignore into packages (package,version,release) values (?,?,?)";
	int rc;
	sqlite3_stmt *ifile;

	rc = sqlite3_prepare(db, sql, -1, &ifile,0);
	if (rc != SQLITE_OK) {
		SQLERROR(sqlite3_errmsg(db));
		return 0;
	}
	rc = sqlite3_bind_text(ifile, 1, base, strlen(base), SQLITE_STATIC);
	if (rc != SQLITE_OK) {
		SQLERROR(sqlite3_errmsg(db));
		fprintf(stderr, "cant bind package name\n");
		zpm_rollback(pkg);
		return 0;
	}
	sqlite3_bind_text(ifile, 2, version, strlen(version), SQLITE_STATIC);
	sqlite3_bind_int(ifile, 3, release)

	rc = sqlite3_step(ifile);

	if (rc != SQLITE_DONE) {
		SQLERROR(sqlite3_errmsg(db));
		sqlite3_finalize(ifile);
		return 0;
	}
	sqlite3_finalize(ifile);
	z->pkg = dupstr(base);
	z->version = dupstr(version);
	z->release = release;
}
#endif

int zpm_begin(struct zpm *z) {
	char *errstr = 0;
	sqlite3_exec(z->db, "begin;", NULL, NULL, &errstr);
	if (errstr) {
		fprintf(stderr, "sqlite begin error: %s\n", errstr);
		sqlite3_free(errstr);
		return 0;
	}
	return 1;
}

int zpm_commit(struct zpm *z) {
	char *errstr = 0;
	sqlite3_exec(z->db, "commit;", NULL, NULL, &errstr);
	if (errstr) {
		fprintf(stderr, "sqlite commit error: %s\n", errstr);
		sqlite3_free(errstr);
		return 0;
	}
	return 1;
}

int zpm_rollback(struct zpm *z) {
	char *errstr = 0;
	sqlite3_exec(z->db, "rollback;", NULL, NULL, &errstr);
	if (errstr) {
		fprintf(stderr, "sqlite rollback error: %s\n", errstr);
		sqlite3_free(errstr);
		return 0;
	}
	return 1;
}

/* NULL?  Create? */
int zpm_open(struct zpm *pkg, char *path) {
	int rc;
	char *errstr = 0;
	sqlite3 *db = 0;

	pkg->db = 0;
	pkg->path = 0;
	pkg->version = 0;
	pkg->release = 0;
	pkg->pkgname = 0;
	pkg->installed = 0;

	/* TODO some way to determine if the DB is newly created ? */
	/* could check for tables, if there are any, then check version, etc */
	rc = sqlite3_open(path, &db);
	if (rc) {
		SQLERROR(sqlite3_errmsg(db));
		sqlite3_close(db);
		return 0;
	}
	sqlite3_exec(pkg->db, "pragma foreign_keys = ON;", NULL, NULL, &errstr);
	if (errstr) {
		fprintf(stderr, "sqlite foreign key error: %s\n", errstr);
		sqlite3_free(errstr);
		sqlite3_close(db);
		return 0;
	}

	pkg->path = dupstr(path);
	pkg->db   = db;

	/* TODO if this is a new database, create structures */

	/* get a package. what if more than one? what if none? */
	return 1;
}

int zpm_close(struct zpm *pkg) {
	if (pkg) {
		sqlite3_close(pkg->db);
		free(pkg->path);
	}
	/* TODO free any malloced names and such */
	return 1;
}

int zpm_extract(struct zpm *pkg, char *hash, char *path, int mode) {
	int rc;

	int blobsize;
	int64_t size;
	void *xzdata;
	int type;
	FILE *out;
	sqlite3_stmt *ifile;

	/* TODO check null */
	sqlite3 *db = pkg->db;

	rc = sqlite3_prepare(db, "select size, content from files where hash = ?", -1, &ifile,0);
	if (rc != SQLITE_OK) {
		SQLERROR(sqlite3_errmsg(db));
		return 0;
	}

	/* hash, filename */

	sqlite3_bind_text(ifile, 1, hash, 64, SQLITE_STATIC);

	rc = sqlite3_step(ifile);

	if (rc == SQLITE_DONE) {
		/* didn't find a row */
		sqlite3_finalize(ifile);
		sqlite3_close(db);
		fprintf(stderr, "no such hash\n");
		return 0;
	}
	/* either way we're done with this now */

	if (rc != SQLITE_ROW) {
		SQLERROR(sqlite3_errmsg(db));
		sqlite3_finalize(ifile);
		sqlite3_close(db);
		return 0;
	}

	type = sqlite3_column_type(ifile, 0);
	if (type == SQLITE_NULL) {
		fprintf(stderr, "no file size\n");
		sqlite3_finalize(ifile);
		sqlite3_close(db);
		return 0;
	}
	type = sqlite3_column_type(ifile, 1);
	if (type == SQLITE_NULL) {
		fprintf(stderr, "no file data\n");
		sqlite3_finalize(ifile);
		sqlite3_close(db);
		return 0;
	}
	size = sqlite3_column_int64(ifile, 0);
	xzdata = (void *)sqlite3_column_blob(ifile, 1);
	blobsize = sqlite3_column_bytes(ifile, 1);

	out = fopen(path, "w");
	if (!out) {
		fprintf(stderr, "can't open output file %s\n", path);
		sqlite3_finalize(ifile);
		sqlite3_close(db);
		return 5;
	}
	//fwrite(xzdata, blobsize, 1, stdout);

	fprintf(stderr, "uncompressing %d bytes at %p, expect %lld\n", blobsize, xzdata, (long long int)size);
	uncompresslzma(xzdata, blobsize, out);
	fclose(out);

	sqlite3_finalize(ifile);

	return 0;
	
}

#if 1
int zpm_import(struct zpm *pkg, char *path, uint32_t flags, char *hash) {
	int fd;
	void *content;
	struct stat sbuf;
	unsigned char tmp[32];
	hash_state md;
	sqlite3_stmt *ifile;
	int haverow,havedata;
	int j,rc,type;
	char hashbuf[65];

	/* xz compress it */
	size_t outlen = 0;
	void *outbuf;

	if (!pkg || !pkg->db || !path) {
		return 0;
	}

	/* use local if caller didn't pass in room */
	if (!hash) {
		hash = hashbuf;
	}

	/* mmap the file */
	fd = open(path, O_RDONLY);
	if (fd == -1) {
		return 0;
	}
	if (fstat(fd, &sbuf) == -1) {
		return 0;
	}
	/* not a regular file? */
	if (!S_ISREG(sbuf.st_mode)) {
		/* TODO this is ok, just stored differently */
		return 0;
	}

	content = mmap(0, sbuf.st_size, PROT_READ,MAP_PRIVATE, fd, 0);
	if (!content) {
		return 0;
	}

	/* get hash */
	sha256_init(&md);
	sha256_process(&md, content, sbuf.st_size);
	sha256_done(&md, tmp);
	for (j=0;j<32;j++) {
		sprintf(hash+j*2, "%02x", (unsigned)tmp[j]);
	}
	hash[64] = 0;
//	fprintf(stderr, "file %s: %s\n", path, hash);

	/* compress */
	outbuf = compresslzma(content, sbuf.st_size, &outlen);
//	fprintf(stderr, "compressed to %zu\n", outlen);

	/* don't need the original file now */
	munmap(content, sbuf.st_size);
	close(fd);

	/* prepare and bind */
	/* TODO check null */
	sqlite3 *db = pkg->db;

	rc = sqlite3_prepare(db, "select size, content is not null from files where hash = ?", -1, &ifile,0);
	if (rc != SQLITE_OK) {
		SQLERROR(sqlite3_errmsg(db));
		return 1;
	}

	/* hash, filename */

	sqlite3_bind_text(ifile, 1, hash, 64, SQLITE_STATIC);

	rc = sqlite3_step(ifile);

	if (rc != SQLITE_DONE) {
		if (rc != SQLITE_ROW) {
			/* didn't find a row */
			SQLERROR(sqlite3_errmsg(db));
			zpm_rollback(pkg);
			return 0;
		}
		haverow = 1;
//		fprintf(stderr, "have row for hash\n");
		type = sqlite3_column_type(ifile, 0);
		if (type == SQLITE_NULL) {
			/* TODO assert, this shouldn't be possible? */
			fprintf(stderr, "no file size\n");
			sqlite3_finalize(ifile);
			return 0;
		}
		type = sqlite3_column_type(ifile, 1);
		if (type == SQLITE_NULL) {
			/* TODO assert, this shouldn't be possible? */
			fprintf(stderr, "no file data\n");
			sqlite3_finalize(ifile);
			return 0;
			/* which is fine, just need to update the row then */
		}
		havedata = sqlite3_column_int(ifile, 1);
	}

	sqlite3_finalize(ifile);

	if (!havedata) {
		/* start a transaction */
		// do that outside of here 
		//zpm_begin(pkg);

		/* insert */
		if (haverow) {
			rc = sqlite3_prepare(db, "update files set size = ?, content = ? where hash = ?", -1, &ifile,0);
		} else {
//			fprintf(stderr, "missing file data\n");
			rc = sqlite3_prepare(db, "insert into files (size, content, hash) values (?,?,?)", -1, &ifile,0);
		}
		if (rc != SQLITE_OK) {
			SQLERROR(sqlite3_errmsg(db));
			fprintf(stderr, "cant prepare data\n");
			zpm_rollback(pkg);
			return 0;
		}

		sqlite3_bind_int64(ifile, 1, (sqlite3_int64)sbuf.st_size);
		if (rc != SQLITE_OK) {
			SQLERROR(sqlite3_errmsg(db));
			fprintf(stderr, "cant bind size\n");
			zpm_rollback(pkg);
			return 0;
		}
		sqlite3_bind_blob64(ifile, 2, outbuf, (sqlite3_int64)outlen, SQLITE_STATIC);
		if (rc != SQLITE_OK) {
			SQLERROR(sqlite3_errmsg(db));
			fprintf(stderr, "cant bind content\n");
			zpm_rollback(pkg);
			return 0;
		}
		sqlite3_bind_text(ifile, 3, hash, 64, SQLITE_STATIC);
		if (rc != SQLITE_OK) {
			SQLERROR(sqlite3_errmsg(db));
			fprintf(stderr, "cant bind hash\n");
			zpm_rollback(pkg);
			return 0;
		}
		rc = sqlite3_step(ifile);
		if (rc != SQLITE_DONE) {
			SQLERROR(sqlite3_errmsg(db));
			sqlite3_finalize(ifile);
			zpm_rollback(pkg);
			return 0;
		}
		sqlite3_finalize(ifile);

		/* commit */
		//zpm_commit(pkg);

	}

	/* if package and not nopackage flag, add to package */
	if (pkg->pkgname && (!ZPM_NOPACKAGE)) {
		/* TODO */
	}

	/* return */
	return 1;
}
#endif

#if 0
int main(int ac, char **av){
	sqlite3 *db = 0;
	int rc;

	int blobsize;
	int64_t size;
	void *xzdata;
	int type;
	FILE *out;
	sqlite3_stmt *ifile;

	char *hash;
	char *filename;

	if (ac < 3) {
		fprintf(stderr, "usage: db hash file\n");
		return 1;
	}

	rc = sqlite3_open(av[1], &db);
	if (rc) {
		SQLERROR(sqlite3_errmsg(db));
		sqlite3_close(db);
		return 1;
	}

}
#endif

#if 0
Packages are sqlite databases

get application id and userver

Primitive operations:

add path to repo
associate path with package
associate blob with path?
add blob to repo
* extract blob to a path
compare blob to filesystem path
create package with info

Extra primitives:

record elf information about blob
compress blob
uncompress blob
sign a package?  What are we verifying?
#endif