#
# vim: expandtab
#
# bottalk script
#
# this is a heavily modified version of dictionary.tcl 2.7 by perpleXa.
#

# Dictionary
# Copyright (C) 2004-2007 perpleXa
# http://perplexa.ugug.org / #perpleXa on QuakeNet
#
# Redistribution, with or without modification, are permitted provided
# that redistributions retain the above copyright notice, this condition
# and the following disclaimer.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
# PARTICULAR PURPOSE.
#
# To enable the script on a channel type (partyline):
#  .chanset #channel +dictionary

namespace eval dictionary {
  # term/definition file.
  # the format is a tcl dict.
  variable term_file "scripts/dbase/dictionary.db"

  # file containing nicks to not respond to.
  # newline separated.
  variable skip_nick_file "scripts/dictionary_skip_nicks.txt"

  # file containing affirmative responses.
  # newline separated.
  variable affirmative_responses_file "scripts/dictionary_affirmative_list.txt"

  # file containing negative responses.
  # newline separated.
  variable negative_responses_file "scripts/dictionary_negative_list.txt"

  # file containing chatty responses. these are really just random phrases
  # for the bot to respond with assuming it has been addressed in some
  # way and has nothing really to say about it.
  # newline separated.
  variable chatty_responses_file "scripts/dictionary_chatty_list.txt"

  # time to not respond to the same word in the same channel. this is
  # so we don't respond to the same word in quick succession.
  # 5 minutes.
  variable throttle_time 300

  # dictionary terms. dict file.
  # each key is a term and associates with another dict.
  # the sub-dict has keys:
  # def, the definition
  # include_term_in_def, which controls whether we output "<term> is <def>"
  #   or just "<def>"
  variable terms [dict create]

  # nicks to not respond to terms for. e.g., bots.
  variable skip_nicks [list]

  # list of affirmative responses.
  variable affirmative_responses [list]

  # list of negative responses.
  variable negative_responses [list]

  # dict with keys <channel><term> with values containing
  # the unixtime the last time the term was output, if any.
  # this is for throttling term outputs.
  variable flood [dict create]

  bind pubm -|- "*"          ::[namespace current]::public
  bind pubm -|- "*"          ::[namespace current]::publearn
  bind evnt -|- "save"       ::[namespace current]::save

  setudef flag dictionary
}

# respond to terms in the channel
proc ::dictionary::public {nick host hand chan argv} {
  variable flood
  variable terms
  variable throttle_time
  variable skip_nicks
  global botnick

  if {![channel get $chan dictionary]} {
    return
  }

  # ignore cases of '<mynick>:' because those are commands to us.
  if {[lindex [split $argv] 0] == "$botnick:"} {
    return
  }

  # if the nick is one to skip, then get out now.
  foreach skip_nick $skip_nicks {
    if {[string equal -nocase $nick $skip_nick]} {
      return
    }
  }

  # look for a word we know about.
  set term ""
  foreach word [dict keys $terms] {
    if {[::dictionary::string_contains_term $argv $word]} {
     set term $word
     break
    }
  }

  if {$term == ""} {
    # They didn't say a term we know something about. In this case the only
    # response we'll send is if they said our name. Send them a chatty response
    # if so.
    if {[::dictionary::string_contains_term $argv $botnick]} {
      set response [::dictionary::get_chatty_response $nick]
      putserv "PRIVMSG $chan :$response"
    }
    return
  }

  set term_dict [dict get $terms $term]

  # check if we've responded to the word recently so we don't
  # keep saying it.
  set flood_key $chan$term
  if {![dict exists $flood $flood_key]} {
    dict set flood $flood_key 0
  }
  set last_term_output_time [dict get $flood $flood_key]
  if {[unixtime] - $last_term_output_time <= $throttle_time} {
    return
  }
  dict set flood $flood_key [unixtime]

  # output the def.
  set def [dict get $term_dict def]
  # terms get output differently depending on how they were
  # added.
  if {[dict get $term_dict include_term_in_def]} {
    puthelp "PRIVMSG $chan :$term is $def"
    return
  }
  puthelp "PRIVMSG $chan :$def"
}

# public trigger. this handles interaction to set/clear terms
# and for responding directly by the bot.
proc ::dictionary::publearn {nick host hand chan argv} {
  global botnick
  variable terms

  if {![channel get $chan dictionary]} {
    return
  }
  set argv [stripcodes "uacgbr" $argv]

  # we only respond to the case where the message starts
  # with '<botnick>:'
  if {[lindex [split $argv] 0] != "$botnick:"} {
    return
  }

  # try to set a term.
  # this can be done by: <botnick>: <term> is <definition>
  # and: <botnick>: <term>, <definition>
  if {([lsearch $argv "is"] >= 0 && [llength $argv] >= 4) \
    || ([string first "," $argv]>-1 && [llength $argv] >= 3)} \
  {
    # <botnick>: <term> is <definition
    set include_term_in_def 1
    if {[lsearch $argv "is"] >= 0 && [string first "," $argv] < 0} {
      set term [lrange [split $argv] 1 [expr [lsearch $argv "is"] - 1]]
      set description "[lrange [split $argv] [expr [lsearch $argv "is"] + 1] end]"
    # <botnick>: <term>, <definition>
    } else {
      set term [lrange [split $argv] 1 end]
      set term [string range $term 0 [expr [string first "," $term] - 1]]
      set include_term_in_def 0
      set description "[string range $argv [expr [string first "," $argv] + 2] end]"
    }

    if {[dict exists $terms $term]} {
      set term_dict [dict get $terms $term]
      set def [dict get $term_dict def]
      putserv "PRIVMSG $chan :$term is already $def"
      return
    }

    set term [string trim $term]
    set description [string trim $description]
    if {[string length $term] == 0 || [string length $description] == 0} {
      set response [::dictionary::get_negative_response $nick]
      putserv "PRIVMSG $chan :$response"
      return
    }

    # set it, and send a random success response.
    set term_dict [dict create]
    dict set term_dict def $description
    dict set term_dict include_term_in_def $include_term_in_def
    dict set terms $term $term_dict
    set response [::dictionary::get_affirmative_response $nick]
    putserv "PRIVMSG $chan :$response"
    return
  }

  # delete a term. <botnick>: forget <term>
  if {[lindex [split $argv] 1] == "forget" && [llength $argv] >= 3} {
    set term [lrange [split $argv] 2 end]
    # if it does not exist, then send a random deny response.
    if {![dict exists $terms $term]} {
      set response [::dictionary::get_negative_response $nick]
      putserv "PRIVMSG $chan :$response"
      return
    }
    dict unset terms $term
    putserv "PRIVMSG $chan :I forgot $term."
    return
  }

  # message the nick all terms we have
  if {[lindex [split $argv] 1] == "listem" && [llength $argv] == 2} {
    foreach term [lsort -dictionary [dict keys $terms]] {
      set term_dict [dict get $terms $term]
      set def [dict get $term_dict def]
      puthelp "PRIVMSG $nick :$term: $def"
    }
    return
  }

  # unknown command. send a random chatty response.
  set response [::dictionary::get_chatty_response $nick]
  putserv "PRIVMSG $chan :$response"
}

# Return 1 if the string contains the term. This is tested case insensitively.
#
# The term is present only if it is by itself surrounded whitespace or
# punctuation.
#
# e.g. if the term is 'test' then these strings contain it:
#
# hi test hi
# hi test, hi
# test
#
# But these do not:
#
# hi testing hi
# hitest
proc ::dictionary::string_contains_term {s term} {
  set term_lc [string tolower $term]

  set term_quoted [::dictionary::quotemeta $term_lc]

  # \m matches at the beginning of a word, \M at the end.
  return [regexp -nocase -- \\m$term_quoted\\M $s]
}

# Escape/quote metacharacters so that the string becomes suitable for placing in
# a regular expression. This makes it so any regex metacharacter is quoted.
#
# See http://stackoverflow.com/questions/4346750/regular-expression-literal-text-span/4352893#4352893
proc ::dictionary::quotemeta {s} {
  return [regsub -all {\W} $s {\\&}]
}

proc ::dictionary::get_random_response {responses nick} {
  # we assume we have responses in the list.

  set response_index [rand [llength $responses]]
  set response [lindex $responses $response_index]

  # replace %%nick%% with %%nick%% if present.
  return [regsub -all -- "%%nick%%" $response $nick]
}

proc ::dictionary::get_affirmative_response {nick} {
  if {[llength $::dictionary::affirmative_responses] == 0} {
    return "OK."
  }
  return [::dictionary::get_random_response \
    $::dictionary::affirmative_responses $nick]
}

proc ::dictionary::get_negative_response {nick} {
  if {[llength $::dictionary::negative_responses] == 0} {
    return "No."
  }
  return [::dictionary::get_random_response \
    $::dictionary::negative_responses $nick]
}

proc ::dictionary::get_chatty_response {nick} {
  if {[llength $::dictionary::chatty_responses] == 0} {
    return "Hi."
  }
  return [::dictionary::get_random_response \
    $::dictionary::chatty_responses $nick]
}

# load the term database from our data file.
proc ::dictionary::load_terms {} {
  variable term_file
  variable terms
  set terms [dict create]

  if {[catch {open $term_file "r"} fp]} {
    return
  }
  set terms [read -nonewline $fp]
  close $fp
  set count [llength [dict keys $terms]]
  return $count
}

# load contents of a file into a list.
# each line of the file is made into one element in the list.
# blank lines are skipped.
#
# path: path to the file to open
#
# returns: if we do not find the file or we can't open it then we return an
#   empty list.
proc ::dictionary::file_contents_to_list {path} {
  if {![file exists $path]} {
    return [list]
  }
  if {[catch {open $path r} fp]} {
    return [list]
  }
  set content [read -nonewline $fp]
  close $fp

  set l [list]
  foreach line [split $content "\n"] {
    set line [string trim $line]
    if {[string length $line] == 0} {
      continue
    }
    lappend l $line
  }
  return $l
}

# load a list of nicks to skip from a data file.
#
# returns: void
proc ::dictionary::load_skip_nicks {} {
  set ::dictionary::skip_nicks [::dictionary::file_contents_to_list \
    $::dictionary::skip_nick_file]
}

# load affirmative responses from data file.
#
# returns: void
proc ::dictionary::load_affirmative_responses {} {
  set ::dictionary::affirmative_responses [::dictionary::file_contents_to_list \
    $::dictionary::affirmative_responses_file]
}

# load negative responses from data file.
#
# returns: void
proc ::dictionary::load_negative_responses {} {
  set ::dictionary::negative_responses [::dictionary::file_contents_to_list \
    $::dictionary::negative_responses_file]
}

# load chatty responses from data file.
#
# returns: void
proc ::dictionary::load_chatty_responses {} {
  set ::dictionary::chatty_responses [::dictionary::file_contents_to_list \
    $::dictionary::chatty_responses_file]
}

# load data from our data files into memory.
proc ::dictionary::load {args} {
  # the term database.
  set term_count [::dictionary::load_terms]

  # nicks to skip.
  ::dictionary::load_skip_nicks

  # responses.
  ::dictionary::load_affirmative_responses
  ::dictionary::load_negative_responses
  ::dictionary::load_chatty_responses

  return $term_count
}

# save the term/definitions to the data file.
proc ::dictionary::write_db {} {
  variable term_file
  variable terms

  if {![file isdirectory [file dirname $term_file]]} {
    file mkdir [file dirname $term_file]
  }
  set fp [open $term_file w]
  puts -nonewline $fp $terms
  close $fp
}

# handle save events.  write out our data files.
proc ::dictionary::save {args} {
  # term database.
  ::dictionary::write_db
}

set ::dictionary::count [::dictionary::load]
putlog "dictionary.tcl loaded. $::dictionary::count term(s)."