import os.path

from sys import stderr

import sqlite

from utils import sql_quote, unique

_log = stderr

def rating_to_color(rating):

    i = rating - 75

    red = green = blue = 0

    if i <= 25:

        red = 255

        green = i * 255 / 25

    elif i <= 50:

        red = (50-i) * 255 / 25

        green = 255

    else:

        green = 255

        blue = (i-50) * 255 / 25

    return "#%02x%02x%02x" % (red, green, blue)

class IMMSDb:

    def __init__(self, dbname = None):

        if not dbname:

            dbname = os.environ['HOME'] + '/.imms/imms.db'

        # autocommit = 1 disable autocommit!

        self.cx = sqlite.connect(dbname, autocommit = 1, timeout = 5)

        self.cu = self.cx.cursor()

    def get_library_entry(self, **kw):

        qry = "SELECT path, uid, sid FROM Library";

        first = 1

        for key in kw.keys():

            if first:

                qry += " WHERE "

                first = 0

            else:

                qry += " AND "

            if key in ['uid', 'sid']:

                qry += "%s = %d" % (key, kw[key])

            else:

                qry += "%s = '%s'" % (key, sql_quote(kw[key]))

        qry += ";"

        self.cu.execute(qry)

        return self.cu.fetchall()

        return res

    def update_filename(self, oldname, newname):

        self.cu.execute("""UPDATE Library

            SET path = '%s'

            WHERE path = '%s';""" % (sql_quote(newname),

                                     sql_quote(oldname)))

    def erase_filename(self, name):

        self.cu.execute("""DELETE FROM Library

            WHERE path = '%s';""" % sql_quote(name))

    def erase_uid(self, uid):

        self.cu.execute("""BEGIN TRANSACTION;

             DELETE FROM Library WHERE uid = %d;

             DELETE FROM Rating WHERE uid = %d;

             DELETE FROM Acoustic WHERE uid = %d;

             COMMIT;""" % (uid, uid, uid))

    def erase_sid(self, sid):

        self.cu.execute("""BEGIN TRANSACTION;

              DELETE FROM Library WHERE sid = %d;

              DELETE FROM Info WHERE sid = %d;

              DELETE FROM Last WHERE sid = %d;

              COMMIT;""" % (sid, sid, sid))

    def erase_path(self, path):

        self.cu.execute("DELETE FROM Library WHERE path = '%s';" \

                        % sql_quote(path))

    def get_paths(self, uids = None, sids = None):

        qry = "SELECT uid, sid, path FROM Library"

        first = 1

        for uid in uids:

            if first:

                qry += ' WHERE'

                first = 0

            else:

                qry += ' OR'

            qry += " uid = %d" % uid

        for uid in uids:

            if first:

                qry += ' WHERE'

                first = 0

            else:

                qry += ' OR'

            qry += " sid = %d" % uid

        qry += ';'

        self.cu.execute(qry)

        return self.cu.fetchall()        

    def get_ratings(self, min = 0, max = 150):

        self.cu.execute('''SELECT Rating.uid, Rating.rating 

                   FROM Rating

                   WHERE Rating.rating >= %d

                   AND Rating.rating <= %d

                   ORDER BY Rating.rating;''' % (min, max))

        return self.cu.fetchall()

    def get_acoustics(self, uids = None):

        qry = "SELECT uid, bpm, spectrum FROM Acoustic"

        first = 1

	if uids:

             for uid in uids:

                 if first:

                     qry += ' WHERE'

                     first = 0

                 else:

                     qry += ' OR'

                 qry += " uid = %d" % uid

        qry += ';'

        self.cu.execute(qry)

        return self.cu.fetchall()

    def get_infos(self, sids = None):

        qry = "SELECT sid, artist, title FROM Info"

        first = 1

        if sids:

            for sid in sids:

                if first:

                    qry += ' WHERE'

                    first = 0

                else:

                    qry += ' OR'

                qry += " sid = %d" % id

        qry += ';'

        self.cu.execute(qry)

        return self.cu.fetchall()

    def get_last(self, sids = None):

        qry = "SELECT sid, last FROM Last"

        first = 1

        if sids:

            for sid in sids:

                if first:

                    qry += ' WHERE'

                    first = 0

                else:

                    qry += ' OR'

                qry += " sid = %d" % id

        qry += ';'

        self.cu.execute(qry)

        return self.cu.fetchall()

    def get_uid_by_path(self, path):

        entries = self.get_library_entry(path = path)

        return map(lambda x: x[1], entries)

    def get_alike(self, uid):

        self.cu.execute('SELECT sid FROM Library WHERE uid = %d;' % uid)

        sids = self.cu.fetchall()

        res = {}

        for sid in sids:

            sid = int(sid)

            self.cu.execute("SELECT uid FROM Library "

                            "WHERE sid = %d;" % sid)

            res[sid] = []

            for uid in self.cu.fetchall():

                res[sid].append(int(uid))

        return res

    def get_ratings_and_paths(self, uids = None):

        qry = '''SELECT l.uid, r.rating, l.path, ls.last

               FROM Library l, Rating r, Last ls

               WHERE l.uid = r.uid AND l.sid = ls.sid'''

        if uids:

            qry += ' AND (l.uid = %d' % (uids.pop())

            for uid in uids:

                qry += ' OR l.uid = %d' % uid

            qry += ')'

        qry += ';'

        self.cu.execute(qry)

        # Better to fetch everything since locking can really mess

        # things in imms plugin.

	results = {}

	tune = self.cu.fetchone()

        while tune:

            uid = int(tune[0])

            if results.has_key(uid):

                results[uid]['path'].append(tune[2])

            else:

                results[uid] = {

                    'rating' : int(tune[1]),

                    'path' : [ tune[2] ],

                    'last' : int(tune[3])}

            tune = self.cu.fetchone()

        return results

    def get_ratings_and_infos(self):

        self.cu.execute('''SELECT r.rating, i.artist, i.title

            FROM Library l, Rating r, Info i

            WHERE l.uid = r.uid AND l.sid = i.sid;''')

        return self.cu.fetchall()

    def clean_info(self):

        self.cu.execute("""DELETE FROM Info

            WHERE sid NOT IN

            (SELECT sid FROM Library);""")

    def clean_last(self):

        self.cu.execute("""DELETE FROM Last

            WHERE sid NOT IN

            (SELECT sid FROM Library);""")

    def clean_rating(self):

        self.cu.execute("""DELETE FROM Rating

            WHERE uid NOT IN

            (SELECT uid FROM Library);""")

    def clean_acoustic(self):

        self.cu.execute("""DELETE FROM Acoustic

            WHERE uid NOT IN

            (SELECT uid FROM Library);""")

    def clean_correlations(self):

        self.cu.execute("""DELETE FROM Correlations

            WHERE origin NOT IN (SELECT sid FROM Library)

            OR destination NOT IN (SELECT sid FROM Library);""")

    def clean_all(self):

        self.cu.execute("BEGIN TRANSACTION;")

        self.clean_info()

        self.clean_last()

        self.clean_rating()

        self.clean_acoustic()

        self.clean_correlations()

        self.cu.execute("COMMIT;")

class IMMSCleaner:

    def __init__(self, db):

        self.db = db

    def check_uid(self, uid):

        lib = self.db.get_library_entry(uid = uid)

        if len(lib) == 0:

            print >> _log, "Erased uid = ", uid

            self.db.erase_uid(uid)

    def check_sid(self, sid):

        lib = self.db.get_library_entry(sid = sid)

        if len(lib) == 0:

            print >> _log, "Erased sid = ", sid

            self.db.erase_sid(sid)

    def is_path_in_db(self, path):

        return len(self.db.get_library_entry(path = path))

    # Note: I doesn't much how I handle the two following functions...

    # May be I must just have the second one and handle everything

    # else in the derived class.

    def check_and_edit_path(self, path, uid, sid):

        """Must return the new path, None to remove

        it.  If the new file name is already in the Db,

        it will be skip.  The skip is more efficient if path

        is return.

        This is the default handler which always skip the file by

        returning path directly.

        """

        # The right thing (but not safe) would be to erase the

        # file if it already exist in the db...  But I find it

        # too much unsafe... Erasing a file shouldn't be easy to

        # do.

        return path

    def clean_library(self):

        lib = self.db.get_library_entry()

	print >> _log, "Processing %d entries" % len(lib)

        deleted_uids = []

        deleted_sids = []

        for entry in lib:

            path, uid, sid = entry

            uid = int(uid)

            sid = int(sid)

            newfile = self.check_and_edit_path(path, uid, sid)

            if not newfile:

                print >> _log, "Erasing ", path

                self.db.erase_filename(path)

                deleted_uids.append(uid)

                deleted_sids.append(sid)

            elif (path == newfile):

                pass

            elif self.is_path_in_db(newfile):

                print >> _log, "Skipping ", path

                pass

            else:

                print >> _log, "Renaming ", path, " into ", newfile

                self.db.update_filename(path, newfile)

        map(self.check_uid, unique(deleted_uids))

        map(self.check_sid, unique(deleted_sids))

##     def clean_rating(self):

## 	print >> _log, "Clean Rating"

##         rates = self.db.get_ratings()

##         rates = unique(map(lambda x: x[0], rates))

##         map(self.check_uid, rates)

##     def clean_acoustic(self):

## 	print >> _log, "Clean Acoustic"

##         uids = self.db.get_acoustics()

## 	uids = map(lambda x: x[0], uids )

##         map(self.check_uid, uids)

##     def clean_info(self):

## 	print >> _log, "Clean Info"

##         sids = map(lambda x: x[0], self.db.get_infos())

##         map(self.check_sid, sids)

##     def clean_last(self):

## 	print >> _log, "Clean Last"

##         sids = map(lambda x: x[0], self.db.get_last())

##         map(self.check_sid, sids)

    def clean_all(self):

##         self.clean_rating()

##         self.clean_acoustic()

##         self.clean_info()

##         self.clean_last()