#!/usr/bin/env bash
# Reproducible PM CLI handoff demo from https://preu.at/work/pm-cli
# Download: https://preu.at/case-study/pm-handoff.sh
#
# Two "sessions" share nothing but the repository: session 1 records a goal, a decision,
# work with acceptance criteria and evidence; session 2 starts cold and asks PM for context.
# Synthetic project, throwaway directory, telemetry off. Requires @unbrained/pm-cli (`pm`).
#
#   bash pm-handoff.sh            # prints the transcript
#   KEEP=1 bash pm-handoff.sh     # keeps the demo repo for inspection
set -euo pipefail

dir="$(mktemp -d "${TMPDIR:-/tmp}/pm-handoff.XXXXXX")"
[[ "${KEEP:-}" == 1 ]] || trap 'rm -rf "$dir"' EXIT
cd "$dir"
git init -q

run() { printf '$ %s\n' "$*"; "$@"; printf '\n'; }
id_of() { pm list --json 2>/dev/null | node -e 'let s="";process.stdin.on("data",d=>s+=d).on("end",()=>{const d=JSON.parse(s);const it=(d.items||d).find(i=>i.title===process.argv[1]);process.stdout.write(it?it.id:"")})' "$1"; }

echo "# pm $(pm --version) — demo repo: $dir"
pm init rpt --defaults --agent-guidance skip >/dev/null 2>&1
pm config project set telemetry-tracking off >/dev/null 2>&1

echo "# ---- Session 1 ----"
export PM_AUTHOR=session-1
pm create epic "CSV export for monthly reports" \
  --description "Finance re-types numbers from the reports page into spreadsheets." \
  --ac "Finance can download any closed month as CSV" >/dev/null
epic="$(id_of 'CSV export for monthly reports')"
pm create decision "Stream CSV rows instead of building files in memory" --parent "$epic" \
  --description "Large months exceed the 512 MB worker limit when buffered." \
  --ac "Export memory stays flat regardless of month size" >/dev/null
decision="$(id_of 'Stream CSV rows instead of building files in memory')"
pm create task "Streaming CSV endpoint" --parent "$epic" \
  --ac "GET /reports/:month.csv streams rows with a header line" \
  --ac "Open months return 409 with an explanation" >/dev/null
api="$(id_of 'Streaming CSV endpoint')"
pm create task "Download button on the reports page" --parent "$epic" --blocked-by "$api" \
  --ac "Button appears only for closed months" >/dev/null
run pm claim "$api" --start
run pm comments "$api" --add "text=Endpoint streams via a cursor (see $decision). Remaining: 409 for open months."
run pm files "$api" --add "path=src/reports/csv.ts,scope=project"
pm release "$api" >/dev/null

echo "# ---- Session 2: a fresh agent, no memory of session 1 ----"
export PM_AUTHOR=session-2
run pm context --for orient --limit 5
run pm get "$api"