#  Copyright (c) 2006 by Aurelien Foret <orelien@chez.com>
#  Copyright (c) 2006-2018 Pacman Development Team <pacman-dev@archlinux.org>
#
#  This program 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 2 of the License, or
#  (at your option) any later version.
#
#  This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.


import os
import shlex
import shutil
import stat
import subprocess
import time

import pmrule
import pmdb
import pmfile
import tap
import util
from util import vprint

class pmtest(object):
    """Test object
    """

    def __init__(self, name, root):
        self.name = name
        self.testname = os.path.basename(name).replace('.py', '')
        self.root = root
        self.dbver = 9
        self.cachepkgs = True
        self.cmd = ["pacman", "--noconfirm",
                "--config", self.configfile(),
                "--root", self.rootdir(),
                "--dbpath", self.dbdir(),
                "--hookdir", self.hookdir(),
                "--cachedir", self.cachedir()]

    def __str__(self):
        return "name = %s\n" \
               "testname = %s\n" \
               "root = %s" % (self.name, self.testname, self.root)

    def addpkg2db(self, treename, pkg):
        if not treename in self.db:
            self.db[treename] = pmdb.pmdb(treename, self.root)
        self.db[treename].pkgs.append(pkg)

    def addpkg(self, pkg):
        self.localpkgs.append(pkg)

    def findpkg(self, name, version, allow_local=False):
        """Find a package object matching the name and version specified in
        either sync databases or the local package collection. The local database
        is allowed to match if allow_local is True."""
        for db in self.db.values():
            if db.is_local and not allow_local:
                continue
            pkg = db.getpkg(name)
            if pkg and pkg.version == version:
                return pkg
        for pkg in self.localpkgs:
            if pkg.name == name and pkg.version == version:
                return pkg

        return None

    def addrule(self, rulename):
        rule = pmrule.pmrule(rulename)
        self.rules.append(rule)

    def load(self):
        # Reset test parameters
        self.result = {
            "success": 0,
            "fail": 0
        }
        self.args = ""
        self.retcode = 0
        self.db = {
            "local": pmdb.pmdb("local", self.root)
        }
        self.localpkgs = []
        self.createlocalpkgs = False
        self.filesystem = []

        self.description = ""
        self.option = {}

        # Test rules
        self.rules = []
        self.files = []
        self.expectfailure = False

        if os.path.isfile(self.name):
            # all tests expect this to be available
            from pmpkg import pmpkg
            with open(self.name) as input:
                exec(input.read(),locals())
        else:
            raise IOError("file %s does not exist!" % self.name)

    def generate(self, pacman):
        tap.diag("==> Generating test environment")

        # Cleanup leftover files from a previous test session
        if os.path.isdir(self.root):
            shutil.rmtree(self.root)
        vprint("\t%s" % self.root)

        # Create directory structure
        vprint("    Creating directory structure:")
        dbdir = os.path.join(self.root, util.PM_SYNCDBPATH)
        cachedir = os.path.join(self.root, util.PM_CACHEDIR)
        syncdir = os.path.join(self.root, util.SYNCREPO)
        tmpdir = os.path.join(self.root, util.TMPDIR)
        logdir = os.path.join(self.root, os.path.dirname(util.LOGFILE))
        etcdir = os.path.join(self.root, os.path.dirname(util.PACCONF))
        bindir = os.path.join(self.root, "bin")
        shell = pacman["scriptlet-shell"][1:]
        shelldir = os.path.join(self.root, os.path.dirname(shell))
        sys_dirs = [dbdir, cachedir, syncdir, tmpdir, logdir, etcdir, bindir,
                    shelldir]
        for sys_dir in sys_dirs:
            if not os.path.isdir(sys_dir):
                vprint("\t%s" % sys_dir[len(self.root)+1:])
                os.makedirs(sys_dir, 0o755)
        # Only the dynamically linked binary is needed for fakechroot
        shutil.copy("/bin/sh", bindir)
        if shell != "bin/sh":
            shutil.copy("/bin/sh", os.path.join(self.root, shell))

        # Configuration file
        vprint("    Creating configuration file")
        util.mkcfgfile(util.PACCONF, self.root, self.option, self.db)

        # Creating packages
        vprint("    Creating package archives")
        for pkg in self.localpkgs:
            vprint("\t%s" % os.path.join(util.TMPDIR, pkg.filename()))
            pkg.finalize()
            pkg.makepkg(tmpdir)
        for key, value in self.db.items():
            for pkg in value.pkgs:
                pkg.finalize()
            if key == "local" and not self.createlocalpkgs:
                continue
            for pkg in value.pkgs:
                vprint("\t%s" % os.path.join(util.PM_CACHEDIR, pkg.filename()))
                if self.cachepkgs:
                    pkg.makepkg(cachedir)
                else:
                    pkg.makepkg(os.path.join(syncdir, value.treename))
                pkg.md5sum = util.getmd5sum(pkg.path)
                pkg.csize = os.stat(pkg.path)[stat.ST_SIZE]

        # Creating sync database archives
        vprint("    Creating databases")
        for key, value in self.db.items():
            vprint("\t" + value.treename)
            value.generate()

        # Filesystem
        vprint("    Populating file system")
        for f in self.filesystem:
            if type(f) is pmfile.pmfile:
                vprint("\t%s" % f.path)
                f.mkfile(self.root);
            else:
                vprint("\t%s" % f)
                path = util.mkfile(self.root, f, f)
                if os.path.isfile(path):
                    os.utime(path, (355, 355))
        for pkg in self.db["local"].pkgs:
            vprint("\tinstalling %s" % pkg.fullname())
            pkg.install_package(self.root)
        if self.db["local"].pkgs and self.dbver >= 9:
            path = os.path.join(self.root, util.PM_DBPATH, "local")
            util.mkfile(path, "ALPM_DB_VERSION", str(self.dbver))

        # Done.
        vprint("    Taking a snapshot of the file system")
        for filename in self.snapshots_needed():
            f = pmfile.snapshot(self.root, filename)
            self.files.append(f)
            vprint("\t%s" % f.name)

    def add_hook(self, name, content):
        if not name.endswith(".hook"):
            name = name + ".hook"
        path = os.path.join("etc/pacman.d/hooks/", name)
        self.filesystem.append(pmfile.pmfile(path, content))

    def add_script(self, name, content):
        if not content.startswith("#!"):
            content = "#!/bin/sh\n" + content
        path = os.path.join("bin/", name)
        self.filesystem.append(pmfile.pmfile(path, content, mode=0o755))

    def snapshots_needed(self):
        files = set()
        for r in self.rules:
            files.update(r.snapshots_needed())
        return files

    def run(self, pacman):
        if os.path.isfile(util.PM_LOCK):
            tap.bail("\tERROR: another pacman session is on-going -- skipping")
            return

        tap.diag("==> Running test")
        vprint("\tpacman %s" % self.args)

        cmd = []
        if pacman["gdb"]:
            cmd.extend(["libtool", "execute", "gdb", "--args"])
        if pacman["valgrind"]:
            suppfile = os.path.join(os.path.dirname(__file__),
                    '..', '..', 'valgrind.supp')
            cmd.extend(["libtool", "execute", "valgrind", "-q",
                "--tool=memcheck", "--leak-check=full",
                "--show-reachable=yes",
                "--gen-suppressions=all",
                "--child-silent-after-fork=yes",
                "--log-file=%s" % os.path.join(self.root, "var/log/valgrind"),
                "--suppressions=%s" % suppfile])
            self.addrule("FILE_EMPTY=var/log/valgrind")

        # replace program name with absolute path
        prog = pacman["bin"]
        if not prog:
            prog = util.which(self.cmd[0], pacman["bindir"])
        if not prog or not os.access(prog, os.X_OK):
            if not prog:
                tap.bail("could not locate '%s' binary" % (self.cmd[0]))
                return

        cmd.append(os.path.abspath(prog))
        cmd.extend(self.cmd[1:])
        if pacman["manual-confirm"]:
            cmd.append("--confirm")
        if pacman["debug"]:
            cmd.append("--debug=%s" % pacman["debug"])
        cmd.extend(shlex.split(self.args))

        if not (pacman["gdb"] or pacman["nolog"]):
            output = open(os.path.join(self.root, util.LOGFILE), 'w')
        else:
            output = None
        vprint("\trunning: %s" % " ".join(cmd))

        # Change to the tmp dir before running pacman, so that local package
        # archives are made available more easily.
        time_start = time.time()
        self.retcode = subprocess.call(cmd,
                cwd=os.path.join(self.root, util.TMPDIR),
                env={'LC_ALL': 'C', 'PATH': os.environ['PATH']})
        time_end = time.time()
        vprint("\ttime elapsed: %.2fs" % (time_end - time_start))

        if output:
            output.close()

        vprint("\tretcode = %s" % self.retcode)

        # Check if the lock is still there
        if os.path.isfile(util.PM_LOCK):
            tap.diag("\tERROR: %s not removed" % util.PM_LOCK)
            os.unlink(util.PM_LOCK)
        # Look for a core file
        if os.path.isfile(os.path.join(self.root, util.TMPDIR, "core")):
            tap.diag("\tERROR: pacman dumped a core file")

    def check(self):
        tap.plan(len(self.rules))
        for i in self.rules:
            success = i.check(self)
            if success == 1:
                self.result["success"] += 1
            else:
                self.result["fail"] += 1
            tap.ok(success, i)

    def configfile(self):
        return os.path.join(self.root, util.PACCONF)

    def dbdir(self):
        return os.path.join(self.root, util.PM_DBPATH)

    def rootdir(self):
        return self.root + '/'

    def cachedir(self):
        return os.path.join(self.root, util.PM_CACHEDIR)

    def hookdir(self):
        return os.path.join(self.root, util.PM_HOOKDIR)
