#!/usr/bin/env tclsh
## -*- tcl -*-
# Extract and report oscon schedule

package require struct
package require csv
package require report
package require htmlparse
package require textutil
package require log

# Restrict logging to levels 'info' and higher.
log::lvSuppressLE debug

# 1. CSV structure filled by the parser = main data table
#    ----------------------------------------------------
#    Day Time/Start Time/End Track Tower Room Speaker Title
#
#    Matrices: "dmain" and "dmainr"
#
#    Difference: dmainr contains gratituous newlines in the
#    speaker column which make for a better TXT report (less
#    wide).
#
#    This is also report 'main'.
#
# 2. Schedule report to see conflicts, CSV structure
#    ----------------------------------------------
#    Day Time                Location-Columns, one per Room
#        (15min granularity) (Content: Speaker + Topic)
#
#    Matrices: "sched" and "schedr". Difference as for dmain(r)
#	and the location columns
#
#    This will be report 'sched'.

proc main {} {
    global pfx argv

    set pfx   [lindex $argv 0]
    set files [lrange $argv 1 end]

    if {($pfx == {}) || ([llength $files] == 0)} {
	usage
	exit -1
    }

    initialize
    foreach f $files {
	log::log info "Scanning \"$f\" ..."
	parse $f
    }
    gen_schedule
    dump_main
    dump_schedule
    postscript
    return
}

proc usage {} {
    global argv0
    puts "usage: $argv0 prefix file..."
}


proc initialize {} {
    global rooms tracks
    ::struct::matrix::matrix dmain  ; # data 1
    ::struct::matrix::matrix dmainr ; # data 1r
    ::struct::matrix::matrix sched  ; # data 2
    ::struct::matrix::matrix schedr ; # data 2r
    array set rooms  {}
    array set tracks {}
    dmain  add columns 8
    dmain  add row {Day Start End Track Tower Room Speaker Title}
    dmainr add columns 8
    dmainr add row {Day Start End Track Tower Room Speaker Title}
    return
}

proc parse {htmlfile} {
    global rooms tracks

    ::struct::tree::tree t

    log::log info "Reading \"$htmlfile\" ..."
    set html [read [set fh [open $htmlfile]]]
    close $fh

    log::log info "Parsing \"$htmlfile\" ..."
    htmlparse::2tree $html t
    htmlparse::removeVisualFluff t
    htmlparse::removeFormDefs t

    log::log info "Extracting information"

    #puts ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    # Navigate and extract the information
    #t walk root -command {print %t %n}
    #exit

    set base [walk {1 1 0 1 1 0 1 0 1 0}]
    set day  [walkf $base {0 0}]
    set day  [escape [t get $day -key data]]
    log::log debug "Day = $day"
    set day [string range $day 0 2]

    # Walk through the sessions of that day.

    set sess [t next $base]
    while {$sess != {}} {
	set start [cvtdate [escape [t get [walkf $sess {0 0}] -key data]]]
	set track [string trim [escape [t get [walkf $sess {1 0}] -key data]]]
	set loc   [escape [t get [walkf $sess {1 1 0}] -key data]]
	set loc   [string trimright $loc "\n\r\t:"]

	log::log debug "    $start - $track - $loc"

	# Separate Room/Tower information ...
	regexp {(.*) in the (.*) Tower} $loc -> room tower
	set room  [string trim $room]
	set tower [string trim $tower]
	set rooms($tower/$room) .
	set tracks($track) .

	set talk [walkf $sess {1 1 3}]
	while {$talk != {}} {
	    set time    [escape [t get $talk -key data]]
	    set talk    [t next $talk]
	    set title   [escape [t get [walkf $talk {0 0 0}] -key data]]
	    set speaker [escape [t get [walkf $talk {0 2}]   -key data]]

	    # Now we have everything to fill the main table ...
	    # (After a bit of munging of the strings we got)

	    foreach {start end} [split $time -] break
	    set start [cvtdate $start]
	    set end   [cvtdate $end]

	    regsub -all \r  $speaker \n speaker
	    regsub -all \n+ $speaker \n speaker
	    regsub -all " *\n *" $speaker "\n" speaker
	    set speakerc [split $speaker "\n"]
	    set speakerc [join $speakerc ", "]
	    log::log debug "        $start - $end - $speakerc - $title"

	    #puts >>$speakerc<<
	    #puts >>$speaker<<

	    #                Day Time/Start Time/End Tower Room Speaker Title
	    dmainr add row [list $day $start $end $track $tower $room $speaker  $title]
	    dmain  add row [list $day $start $end $track $tower $room $speakerc $title]

	    # Forward to next talk
	    catch {set talk [t next $talk]}
	    catch {set talk [t next $talk]}
	}

	set sess [t next $sess]
    }

    t destroy
    return
}

proc print {t n} {
    set  tp  [$t get $n -key type]
    set  d   [$t depth $n]
    set idx ""
    catch {set  idx [$t index $n]}
    incr d  $d
    incr d  $d

    switch -exact -- $tp {
        a {
            log::log debug "[textutil::strRepeat " " $d]$idx $tp ([$t get $n -key data]...)"
        }
        PCDATA {
            log::log debug "[textutil::strRepeat " " $d]$idx $tp ([string range [$t get $n -key data] 0 20]...)"
        }
        default {
            log::log debug "[textutil::strRepeat " " $d]$idx $tp"
        }
    }
}

proc walkf {n p} {
    #log::log info "$n + $p ="
    foreach idx $p {
        if {$n == ""} {break}
        set n [lindex [t children $n] $idx]
        #log::log info "$idx :- $n"
    }
    return $n
}

proc walk {p} {
    return [walkf root $p]
}

proc cvtdate {date} {
    clock format [clock scan $date] -format "%H:%M"
}

proc escape {text} {
    # Special escape for nbsp, convert into space and not the
    # character specified by the standard.

    regsub -all {&nbsp;} $text { } text
    htmlparse::mapEscapes $text
}


proc gen_schedule {} {
    global rooms tracks

    dmain  set rect 0 1 [lsort -decreasing -index 0 [lsort -index 1 [dmain  get rect 0 1 end end]]]
    dmainr set rect 0 1 [lsort -decreasing -index 0 [lsort -index 1 [dmainr get rect 0 1 end end]]]

    sched  add columns 2
    schedr add columns 2
    #sched  add columns [array size rooms]
    #schedr add columns [array size rooms]
    sched  add columns [array size tracks]
    schedr add columns [array size tracks]

    #log::log info Tracks=[array size tracks]
    #log::log info Rooms.=[array size rooms]

    set res [list Day Time]
    set c 2
    foreach k [lsort [array names tracks]] {
	lappend res $k
	set tracks($k) $c
	incr c
    }

    sched  add row $res
    schedr add row $res

    # Data in dmain is already sorted by day. By starting time only
    # partially, there are back references.
    # Just move them to the correct rooms and rows!

    #-- Day Time Location-Columns, one per Room --

    set n [dmain rows]
    set p 0

    array set rmap {}

    for {set r 1} {$r < $n} {incr r} {
	foreach {day start end track tower room speaker title} [dmain get row $r] break
	#[list $day $start $end $tower $room $speakerc $title]

	set key $day,$start
	if {![info exists rmap($key)]} {
	    log::log info "Track schedule $day $start"
	    sched  add row
	    schedr add row
	    incr p

	    set rmap($key) $p
	    sched  set cell 0 $p $day
	    sched  set cell 1 $p $start
	    schedr set cell 0 $p $day
	    schedr set cell 1 $p $start
	}

	sched  set cell $tracks($track) $rmap($key) "$tower; $room; $speaker; $title"
	schedr set cell $tracks($track) $rmap($key) "$tower $room\n$speaker\n$title"
    }

    # Squeeze the columns 2+ in the report matrix

    set cols [schedr columns]
    for {set c 2} {$c < $cols} {incr c} {

	if {[schedr columnwidth $c] > 21} {
	    log::log debug "Squeezing $c"
	    set col [schedr get column $c]
	    set res [list]
	    foreach item $col {
		lappend res [wrap $item 21]
	    }
	    schedr set column $c $res
	}
    }

    # Now sort by day (primary key) and starting time (secondary key).
    # (Meaning we have to sort by time first, and then the day)

    # sched  setrect 0 0 [lsort -decreasing -index 0 [lsort -index 1 [sched  getrect 0 0 end end]]]
    # schedr setrect 0 0 [lsort -decreasing -index 0 [lsort -index 1 [schedr getrect 0 0 end end]]]

    return
}

proc dump_main {} {
    global pfx
    log::log info "Writing talk information /CSV"

    set f [open ${pfx}.main.csv w]
    csv::writematrix dmain $f
    close $f

    log::log info "Writing talk information /TXT"

    # Compute width of report and squeeze the title column to fit
    # below 80 char/line

    # Day Time/Start Time/End Track Tower Room Speaker Title

    set total 0
    incr total [dmain columnwidth 0]
    incr total [dmain columnwidth 1]
    incr total [dmain columnwidth 2]
    incr total [dmain columnwidth 3]
    incr total [dmain columnwidth 4]
    incr total [dmain columnwidth 5]
    incr total [dmain columnwidth 6]

    #log::log info Total=$total

    if {$total < 80} {
	set total [expr {80 - $total}]
	set titles [dmain getcolumn 7]
	set res [list]
	foreach t $titles {
	    lappend res [textutil::adjust $t -length $total]
	}
	dmain setcolumn 7 $res
    }

    ::report::report r [dmainr columns] style captionedtable 1
    set f [open ${pfx}.main.txt w]
    r printmatrix2channel dmainr $f
    close $f
    r destroy

    # Now the HTML report, use 'dmain' as base, actually formatting
    # into lines is done by the browser.

    log::log info "Writing talk information /HTML"

    ::report::report r [dmain columns] style html

    set f [open ${pfx}.main.html w]
    puts $f "<html><head><title>Talk information and schedule</title></head><body>"
    puts $f "<h1>Talk information and schedule</h1>"
    puts $f "<p><table border=1>"
    r printmatrix2channel dmain $f
    puts $f "</table></p></body></html>"
    close $f
    r destroy
}

proc dump_schedule {} {
    global pfx
    log::log info "Writing track schedule /CSV"

    set f [open ${pfx}.sched.csv w]
    csv::writematrix sched $f
    close $f

    log::log info "Writing track schedule /TXT"

    ::report::report r [schedr columns] style captionedtable 1
    r datasep set [r top get]
    r datasep enable

    set f [open ${pfx}.sched.txt w]
    r printmatrix2channel schedr $f
    close $f
    r destroy

    # Now the HTML report, use 'sched' as base, actually formatting
    # into lines is done by the browser.

    log::log info "Writing track schedule /HTML"

    ::report::report r [sched columns] style html

    set f [open ${pfx}.sched.html w]
    puts $f "<html><head><title>Track schedules</title></head><body>"
    puts $f "<h1>Track schedules</h1>"
    puts $f "<p><table border=1>"
    r printmatrix2channel sched $f
    puts $f "</table></p></body></html>"
    close $f
    r destroy
}

proc postscript {} {
    global pfx
    # Transforms texts into printable postscript, using a2ps (if available)

    catch {exec a2ps -o ${pfx}.main.ps  -1 -B -r -f7 ${pfx}.main.txt}
    catch {exec a2ps -o ${pfx}.sched.ps -1 -B -r -f4 ${pfx}.sched.txt}
    return
}

proc wrap {text len} {
    # @author Jeffrey Hobbs <jeff at hobbs org>
    #
    # @c Wraps the given <a text> into multiple lines not
    # @c exceeding <a len> characters each. Lines shorter
    # @c than <a len> characters might get filled up.
    #
    # @a text: The string to operate on.
    # @a len: The maximum allowed length of a single line.
    #
    # @r Basically <a text>, but with changed newlines to
    # @r restrict the length of individual lines to at most
    # @r <a len> characters.

    # @n This procedure is not checked by the testsuite.

    # @i wrap, word wrap

    # Convert all newlines into spaces and initialize the result
    # see ::pool::string::oneLine too.

    regsub -all "\n" $text { } text
    incr len -1

    set out {}

    # As long as the string is longer than the intended length of
    # lines in the result:

    while {[string len $text] > $len} {
	# - Find position of last space in the part of the text
	#   which could a line in the result.

	# - We jump out of the loop if there is none and the whole
	#   text does not contain spaces anymore. In the latter case
	#   the rest of the text is one word longer than an intended
	#   line, we cannot avoid the longer line.

	set i [string last { } [string range $text 0 $len]]

	if {$i == -1 && [set i [string first { } $text]] == -1} {
	    break
	}

	# Get the just fitting part of the text, remove any heading
	# and trailing spaces, then append it to the result string,
	# don't close it with a newline!

	append out [string trim [string range $text 0 [incr i -1]]]\n

	# Shorten the text by the length of the processed part and
	# the space used to split it, then iterate.

	set text [string range $text [incr i 2] end]
    }

    return $out$text
}

# -------------------------------------------
# Define the required reports styles

::report::defstyle simpletable {} {
    data   set [split "[string repeat "| "   [columns]]|"]
    top    set [split "[string repeat "+ - " [columns]]+"]
    bottom set [top get]
    top	   enable
    bottom enable
}
::report::defstyle captionedtable {{n 1}} {
    simpletable
    topdata   set [data get]
    topcapsep set [top  get]
    topcapsep enable
    tcaption $n
}
::report::defstyle html {} {
    set c  [columns]
    set cl $c ; incr cl -1
    data set "<tr> [split [string repeat " " $cl] ""] </tr>"
    for {set col 0} {$col < $c} {incr col} {
	pad $col left  "<td>"
	pad $col right "</td>"
    }
    return
}

# -------------------------------------------

main
exit