#!/usr/bin/env tclsh
# goals_followons.tcl - advisory follow-on disposition report over the goals archive
#
# The goals-system v4 Follow-ons contract (goals/AGENTS.md): archived detail files
# record deferred items as structured column-0 lines in a '## Follow-ons' section -
#   Follow-on: <item text> => open
#   Follow-on: <item text> => goal G-<id>
#   Follow-on: <item text> => landed YYYY-MM-DD (<where>)
#   Follow-on: <item text> => declined YYYY-MM-DD (<why>)
# - and the disposition is flipped (the one sanctioned edit to an archived detail
# file) in the same work unit that acts on the item.
#
# This tool answers "which follow-ons have not been acted on":
#   report   (default) enumerate every structured Follow-on line in
#            goals/archive/G-*.md grouped by disposition, open items first; then
#            advisory flags: archived files carrying follow-on VOCABULARY
#            (follow-on/follow-up/loose end/parked; word-bounded,
#            case-insensitive) with no '## Follow-ons' section - the drift
#            signature of a file whose deferred items were never structured.
#            Malformed Follow-on lines are listed for visibility, but judging
#            them (as fatal findings) is goals_lint.tcl's job.
#
# Heuristic flags are advisory by design (vocabulary in historical prose is
# legitimate); a flagged file is silenced by giving it a '## Follow-ons' section,
# with real items or with a '(none - ...)' prose note.
#
# Plain tclsh (8.6+ or 9), no package dependencies - runnable from any checkout:
#   tclsh scriptlib/developer/goals_followons.tcl [report] [repo-root]
# Always exit 0 when the scan ran (advisory); exit 2 on bad invocation/root.

set args $argv
if {[llength $args] && [lindex $args 0] eq "report"} {
    set args [lrange $args 1 end]
} elseif {[llength $args] && ![file isdir [lindex $args 0]]} {
    puts stderr "goals_followons: unknown subcommand '[lindex $args 0]' (only: report)"
    exit 2
}
set root [expr {[llength $args] ? [lindex $args 0] : [file dirname [file dirname [file dirname [file normalize [info script]]]]]}]
if {![file isfile [file join $root GOALS.md]] || ![file isdir [file join $root goals archive]]} {
    puts stderr "goals_followons: '$root' does not look like the punkshell repo root (need GOALS.md and goals/archive/)"
    exit 2
}

proc read_lines {path} {
    set f [open $path r]
    fconfigure $f -encoding utf-8
    set lines [split [read $f] \n]
    close $f
    return $lines
}

set followon_re {^Follow-on: (.+) => (open|goal G-(\d+)|landed (\d{4}-\d{2}-\d{2})( \(.*\))?|declined (\d{4}-\d{2}-\d{2})( \(.*\))?)$}
set vocab_re {(?i)\y(follow[- ]?ons?|follow[- ]?ups?|loose[- ]ends?|parked)\y}

set open_items {}      ;# {fid item}
set goal_items {}      ;# {fid gid item}
set landed_items {}    ;# {fid date item}
set declined_items {}  ;# {fid date item}
set malformed {}       ;# {relpath lineno}
set unstructured {}    ;# {relpath hits}
set nfiles_with 0

foreach path [lsort [glob -nocomplain -directory [file join $root goals archive] G-*.md]] {
    set fname [file tail $path]
    set relpath goals/archive/$fname
    set fid ""
    regexp {^G-(\d+)-} $fname -> fid
    set lines [read_lines $path]
    set has_section 0
    set file_has_lines 0
    set i 0
    foreach line $lines {
        incr i
        if {$line eq "## Follow-ons"} { set has_section 1 }
        if {![string match "Follow-on:*" $line]} continue
        if {![regexp $followon_re $line -> item dispo gid ldate lwhere ddate dwhy]} {
            lappend malformed [list $relpath $i]
            continue
        }
        set file_has_lines 1
        if {$dispo eq "open"} {
            lappend open_items [list $fid $item]
        } elseif {$gid ne ""} {
            lappend goal_items [list $fid $gid $item]
        } elseif {$ldate ne ""} {
            lappend landed_items [list $fid $ldate $item]
        } else {
            lappend declined_items [list $fid $ddate $item]
        }
    }
    if {$file_has_lines} { incr nfiles_with }
    set hits [regexp -all $vocab_re [join $lines \n]]
    if {$hits > 0 && !$has_section} {
        lappend unstructured [list $relpath $hits]
    }
}

set ntotal [expr {[llength $open_items] + [llength $goal_items] + [llength $landed_items] + [llength $declined_items]}]
puts "goals_followons report: $ntotal structured follow-on(s) in $nfiles_with archived file(s): [llength $open_items] open, [llength $goal_items] goal, [llength $landed_items] landed, [llength $declined_items] declined; [llength $unstructured] unstructured-vocabulary file(s)"

if {[llength $open_items]} {
    puts "\nOPEN (not yet acted on):"
    foreach row [lsort -dictionary -index 0 $open_items] {
        lassign $row fid item
        puts "  G-$fid  $item"
    }
}
if {[llength $goal_items]} {
    puts "\nBECAME GOALS:"
    foreach row [lsort -dictionary -index 0 $goal_items] {
        lassign $row fid gid item
        puts "  G-$fid -> G-$gid  $item"
    }
}
if {[llength $landed_items]} {
    puts "\nLANDED (done without a goal):"
    foreach row [lsort -dictionary -index 0 $landed_items] {
        lassign $row fid date item
        puts "  G-$fid  $date  $item"
    }
}
if {[llength $declined_items]} {
    puts "\nDECLINED:"
    foreach row [lsort -dictionary -index 0 $declined_items] {
        lassign $row fid date item
        puts "  G-$fid  $date  $item"
    }
}
if {[llength $malformed]} {
    puts "\nMALFORMED Follow-on line(s) (goals_lint judges these):"
    foreach row $malformed {
        lassign $row relpath lineno
        puts "  $relpath line $lineno"
    }
}
if {[llength $unstructured]} {
    puts "\nUNSTRUCTURED (follow-on vocabulary, no '## Follow-ons' section - goals/AGENTS.md Follow-ons):"
    foreach row [lsort -index 0 $unstructured] {
        lassign $row relpath hits
        puts "  $relpath  ($hits vocabulary hit(s))"
    }
}
exit 0