#!/usr/bin/python3
#
# Bookmark management utility
#
# Copyright (C) 2015 Arun Prakash Jana <engineerarun@gmail.com>
#
# 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 3 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 markit.  If not, see <http://www.gnu.org/licenses/>.

import sys
import os
import sqlite3
from getopt import getopt, GetoptError
import readline
import webbrowser
import html.parser as HTMLParser
from http.client import HTTPConnection
from http.client import HTTPSConnection

# Globals
addurl = False
online = False
deletedb = False
showdb = False
search = False
entry = None
updatedb = False

def usage():
    print("Usage: markit [OPTIONS] KEYWORDS...")
    print("Bookmark manager. Your private Google.\n")
    print("Options")
    print("  -a URL tag entry1, tag entry2, ...    add a bookmark")
    print("  -d N                                  delete entry at index N")
    print("  -D                                    delete ALL bookmarks")
    print("  -o                                    fetch title info from web")
    print("  -p                                    print all bookmarks")
    print("  -s string(s)                          search all bookmarks for a (partial) tag or keyword")
    print("  -u N                                  update entry at index N (from output of -p)")
    print("                                        you can either add or update or delete in one instance")
    print("                                        any other input shows help and exits markit\n")
    print("Version 0.1")
    print("Copyright (C) 2015 Arun Prakash Jana <engineerarun@gmail.com>")
    print("Webpage: https://github.com/jarun/markit")
    sys.exit(1)

def initdb():
    # Create a connection
    conn = sqlite3.connect('bookmarks.db')
    cur = conn.cursor()

    # Create table if it doesn't exist
    cur.execute('''CREATE TABLE if not exists bookmarks
               (id integer PRIMARY KEY AUTOINCREMENT, URL text NOT NULL UNIQUE, tags text, metadata text)''')
    conn.commit()
    return (conn, cur)

def AddUpdateEntry(conn, cur, keywords, entry):
    global online

    tags = ','
    url = keywords[0]
    for tag in keywords[1:]:
        if tags[-1] == ",":
            tags += tag
        else:
            tags += " " + tag

    if tags[-1] != ",":
        tags += ","

    meta = ''

    if online == True:
        secure = True
        if url.find("https://") >= 0:
            server = url[8:]
        elif url.find("http://") >= 0:
            secure = False
            server = url[7:]
        else:
            online = False

        if online == True:
            marker = server.find("/")
            if marker > 0:
                server = server[:marker]

            try:
                print("server: [%s]" % server)
                if secure == True:
                    urlconn = HTTPSConnection(server, timeout=30)
                else:
                    urlconn = HTTPConnection(server, timeout=30)
                print("URL: [%s]" % url)
                urlconn.request("GET", url)
                resp = urlconn.getresponse()
                if resp.status != 200:
                    print("ERROR:", str(resp.status), ": ", resp.reason)
                    meta = ''
                else:
                    parser = BMHTMLParser()
                    parser.feed(resp.read().decode('utf-8'))
                    if parser.data != None and parser.data.find("Error") < 0:
                        meta = parser.data
            except Exception as e:
                print("Exception: %s" % e)
                meta = ''
            finally:
                urlconn.close()

    print("meta: [%s]" % meta)

    if entry == None: # Add a new entry
        try:
            cur.execute('INSERT INTO bookmarks(URL, tags, metadata) VALUES (?, ?, ?)', (url, tags, meta,))
            conn.commit()
        except sqlite3.IntegrityError:
            print("URL already exists")
    else: # Update an existing entry
        try:
            cur.execute("UPDATE bookmarks SET URL = ?, tags = ?, metadata = ? WHERE id = ?", (url, tags, meta, int(entry),))
            conn.commit()
            if cur.rowcount == 1:
                print("Updated")
            else:
                print("No matching index")
        except sqlite3.IntegrityError:
            print("URL already exists")

def searchdb(cur, keywords):
    searchtag = ''
    searchkey = keywords[0]
    for token in keywords:
        searchtag += token + " "

    searchtag = ',' + searchtag[0:-1] + ','

    count = 0
    results = []
    for row in cur.execute("SELECT url, metadata FROM bookmarks WHERE tags LIKE ('%' || ? || '%') \
                            OR tags LIKE ('%' || ? || '%') \
                            OR URL LIKE ('%' || ? || '%') \
                            OR metadata LIKE ('%' || ? || '%')", (searchtag, searchkey, searchkey, searchkey,)):
        results.append(row[0])
        count += 1
        print("\x1B[1m\x1B[93m%d. \x1B[0m\x1B[92m%s\x1B[0m\n\t%s" % (count, row[0], row[1]))

    if count == 0:
        return

    while True:
        nav = input("Index number to open: ")
        if is_int(nav):
            index = int(nav) - 1
            if index < 0:
                print("Index out of bound.")
                continue

            try:
                _stderr = os.dup(2)
                os.close(2)
                _stdout = os.dup(1)
                os.close(1)
                fd = os.open(os.devnull, os.O_RDWR)
                os.dup2(fd, 2)
                os.dup2(fd, 1)
                try:
                    webbrowser.open(results[int(nav) - 1])
                finally:
                    os.close(fd)
                    os.dup2(_stderr, 2)
                    os.dup2(_stdout, 1)
            except IndexError:
                print("Index out of bound.")
        else:
            break

def cleardb(conn, cur, entry):
    if entry == None: # Remove the table
        cur.execute('DROP TABLE if exists bookmarks')
        conn.commit()
    else: # Remove a single entry
        try:
            cur.execute("DELETE FROM bookmarks WHERE id = ?", (int(entry),))
            conn.commit()
            if cur.rowcount == 1:
                print("Removed")
            else:
                print("No matching index")
        except IndexError:
                print("Index out of bound.")

def printtable(cur):
    for row in cur.execute('SELECT * FROM bookmarks'):
        print("\x1B[1m\x1B[93m%s. \x1B[0m\x1B[92m%s\x1B[0m\n\t[TAGS] %s\n\t[META] %s" % (row[0], row[1], row[2][1:-1], row[3]))

def is_int(string):
    try:
        int(string)
        return True
    except:
        return False

class BMHTMLParser(HTMLParser.HTMLParser):
    def __init__(self):
        HTMLParser.HTMLParser.__init__(self)
        self.inTitle = False
        self.data = ""
        self.lasttag = None

    def handle_starttag(self, tag, attrs):
        self.inTitle = False
        if tag == "title":
            self.inTitle = True
            self.lasttag = tag

    def handle_endtag(self, tag):
        if tag == "title":
            self.inTitle = False

    def handle_data(self, data):
        if self.lasttag == "title" and self.inTitle == True:
            self.data += data


# Main starts here
# ----------------
optlist = None
keywords = None

if len(sys.argv) < 2:
    usage()

try:
    optlist, keywords = getopt(sys.argv[1:], "d:u:aDops")
    if len(optlist) < 1:
        usage()

    for opt in optlist:
        if opt[0] == "-a":
            if updatedb == True or deletedb == True:
                print("You can either add or update or delete in one instance\n")
                usage()

            addurl = True
        elif opt[0] == "-d":
            if addurl == True or updatedb == True:
                print("You can either add or update or delete in one instance\n")
                usage()

            if not opt[1].isdigit():
                usage()

            entry = opt[1]
            if int(entry) <= 0:
                usage()

            deletedb = True
        elif opt[0] == "-D":
            if addurl == True or updatedb == True:
                print("You can either add or update or delete in one instance\n")
                usage()

            deletedb = True
        elif opt[0] == "-o":
            online = True
        elif opt[0] == "-p":
            showdb = True
        elif opt[0] == "-s":
            search = True
        elif opt[0] == "-u":
            if addurl == True or deletedb == True:
                print("You can either add or update or delete in one instance\n")
                usage()

            if not opt[1].isdigit():
                usage()

            entry = opt[1]
            if int(entry) <= 0:
                usage()

            updatedb = True
except GetoptError as e:
    print("markit:", e)
    sys.exit(1)

conn, cur = initdb()

if addurl == True or updatedb == True:
    if len(keywords) < 1:
        usage()

    AddUpdateEntry(conn, cur, keywords, entry)

if search == True:
    if len(keywords) < 1:
        usage()

    searchdb(cur, keywords)

if showdb == True:
    printtable(cur)

if deletedb == True:
    cleardb(conn, cur, entry)

conn.close()