#!/usr/bin/env bash
# Export the local beads DB to .beads/issues.jsonl — a restore copy for
# `bd import` after a wipe (commit it and push the Dolt remote to make it
# durable) — and sync the full `bd backup` target when one is configured.
# Invoked by `make beads-snapshot`.
#
# Beads is OPTIONAL: if the `bd` CLI is not installed, or this project has no
# .beads/ database, the script prints a note and exits 0 (nothing to snapshot).
#
# Atomicity: export writes to an mktemp sibling in .beads/, then `mv -f` renames
# it into place, so a failed export never clobbers a prior good snapshot. An EXIT
# trap removes the temp on any failure or interrupt (bash runs EXIT traps on
# SIGINT too), so it never lingers.
set -euo pipefail

# bd optional: a project without the beads CLI is a graceful no-op, not an error.
if ! command -v bd >/dev/null 2>&1; then
	printf '%s\n' "→ bd not found on PATH — skipping beads snapshot (nothing to do)."
	exit 0
fi

# No beads DB in this project: nothing for bd to snapshot. Graceful no-op.
if [ ! -d .beads ]; then
	printf '%s\n' "→ no .beads/ database here — nothing for bd to snapshot; skipping."
	exit 0
fi

# Install the cleanup trap before mktemp so an interrupt around creation still
# removes the temp; `rm -f ""` is a silent no-op if we're hit before the name is
# captured.
tmp=""
trap '[ -n "$tmp" ] && rm -f "$tmp"' EXIT
tmp="$(mktemp .beads/issues.jsonl.XXXXXX)"

# 2>&1 captures both streams so any diagnostic bd emits (on either stream) is
# withheld from the success output and surfaced on failure. The `if` consumes
# bd's exit status, so `set -e` does not abort on a failed export.
if err="$(bd export --all -o "$tmp" 2>&1)"; then
	if mv -f "$tmp" .beads/issues.jsonl; then
		printf '%s\n' "✓ wrote .beads/issues.jsonl — a restore copy for 'bd import' after a wipe; COMMIT it (git add/commit) and push the Dolt remote to make it durable (bootstrap won't auto-use it)"
		# Full-fidelity Dolt backup (history included) when the project has one
		# configured via `bd backup init`. Detected via the stable machine
		# contract `bd backup status --json` → `.dolt.configured` (a boolean):
		# the human text is TTY/format-fragile and `bd backup status` exits 0
		# even when unconfigured, so neither exit code nor prose is reliable.
		# Capture via command substitution first, then match the captured string
		# — piping bd straight into `grep -q` can race the pipe. Silently skipped
		# when `bd backup` is unavailable (old bd → non-zero) or unconfigured.
		if backup_status="$(bd backup status --json 2>/dev/null | tr -d '[:space:]')" \
			&& printf '%s' "$backup_status" | grep -qE '"dolt":\{[^}]*"configured":true'; then
			if bd backup sync >/dev/null 2>&1; then
				printf '%s\n' "✓ bd backup sync — full-history Dolt backup updated"
			else
				# A backup IS configured but its full-history copy failed to
				# update — fail non-zero so reset automation stops rather than
				# proceeding while a promised durable copy is stale. (The JSONL
				# was still written above, so restore-from-JSONL remains possible.)
				printf '%s\n' "✗ bd backup sync FAILED — a backup is configured but its full-history copy is now stale; resolve before relying on it (check 'bd backup status')" >&2
				exit 1
			fi
		fi
	else
		printf '%s\n' "✗ beads-snapshot failed — could not move the snapshot into place; prior snapshot unchanged" >&2
		exit 1
	fi
else
	if [ -n "$err" ]; then
		printf '%s\n' "$err" >&2
	fi
	printf '%s\n' "✗ beads-snapshot failed — snapshot left unchanged" >&2
	exit 1
fi