#!/usr/bin/env bash
# Step 3 — Rename-aware extraction driver.
# Given a target key from plugin-map.json, clones the dedicated mirror ($WORK/_mirror, built by
# 00-preflight.sh — never the working checkout, R4/M6) into $WORK/<key>, runs a SINGLE git filter-repo
# pass composing --path / --path-rename (both names for renamed plugins, F1) + the deterministic
# ms-ai-architect blob strip (F3), then strips carried-over tags and re-creates exactly one annotated
# tag v<version> at the rewritten HEAD (F5). Idempotent (wipes $WORK/<key> first). NULL push (D8).
#
# Renamed plugins are extracted under BOTH historical names (F1), driven by plugin-map.json:
#   voyage ← ultraplan-local, llm-security ← llm-security-copilot, linkedin-studio ← linkedin-thought-leadership.
# A single-path filter would silently drop the pre-rename history, so the map carries >=2 --path entries each.
#
# Usage: 10-extract.sh <target-key>     (e.g. voyage, llm-security, playground-design-system)
# Override WORK= to relocate the workspace (default /tmp/polyrepo-migration).
set -euo pipefail

KEY="${1:-}"
[ -n "$KEY" ] || { echo "usage: 10-extract.sh <target-key>" >&2; exit 2; }

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
MAP="$SCRIPT_DIR/plugin-map.json"
WORK="${WORK:-/tmp/polyrepo-migration}"
MIRROR="$WORK/_mirror"
DEST="$WORK/$KEY"

fail() { printf 'EXTRACT FAIL: %s\n' "$*" >&2; exit 1; }

[ -f "$MAP" ] || fail "plugin-map.json missing at $MAP"
python3 -c "import json,sys; m=json.load(open('$MAP')); sys.exit(0 if '$KEY' in m['targets'] else 1)" \
  || fail "unknown target '$KEY' (not in plugin-map.json)"

# Self-heal: if the mirror is absent, run preflight to build it (extraction never reads the working checkout).
if [ ! -e "$MIRROR/HEAD" ] && [ ! -d "$MIRROR/.git" ]; then
  echo "  mirror absent → running preflight to build it"
  WORK="$WORK" bash "$SCRIPT_DIR/00-preflight.sh" >/dev/null
fi
[ -e "$MIRROR/HEAD" ] || [ -d "$MIRROR/.git" ] || fail "mirror still absent after preflight: $MIRROR"

# Compose the filter-repo arg list from the map (one arg per line → bash 3.2 array).
ARGS_FILE="$(mktemp)"
python3 - "$MAP" "$KEY" >"$ARGS_FILE" <<'PY'
import json, sys
m = json.load(open(sys.argv[1]))
t = m["targets"][sys.argv[2]]
out = []
for p in t["paths"]:
    out += ["--path", p]
for old, new in t.get("path_renames", {}).items():
    out += ["--path-rename", old + ":" + new]
if t.get("blob_strip"):
    if t.get("blob_strip_safe"):
        out += ["--strip-blobs-bigger-than", "1M"]
    else:
        # Surgical fallback (unreached while blob_strip_safe is true): drop only the screenshots.
        out += ["--path-glob", "!plugins/ms-ai-architect/playground/screenshots/*"]
for a in out:
    print(a)
PY
FR_ARGS=()
while IFS= read -r line; do FR_ARGS+=("$line"); done <"$ARGS_FILE"
rm -f "$ARGS_FILE"

TAG="$(python3 -c "import json; print(json.load(open('$MAP'))['targets']['$KEY']['tag'])")"

# Re-assert the critical extension here too: the self-heal above runs preflight ONLY on a missing mirror,
# so a present mirror + since-uninstalled git-filter-repo would otherwise die with a raw git error instead
# of this actionable message (9e588ca — RUNBOOK lists it under Preconditions).
git filter-repo --version >/dev/null 2>&1 \
  || fail "git filter-repo not available — brew install git-filter-repo (see RUNBOOK Preconditions)"

# Fresh --no-local clone from the mirror, then the single composing filter-repo pass.
rm -rf "$DEST"
git clone --no-local --quiet "$MIRROR" "$DEST"
git -C "$DEST" filter-repo --force "${FR_ARGS[@]}"

# F5: strip every carried-over tag, re-create exactly one annotated tag at the rewritten HEAD.
OLD_TAGS="$(git -C "$DEST" tag)"
if [ -n "$OLD_TAGS" ]; then
  printf '%s\n' "$OLD_TAGS" | while IFS= read -r tg; do
    [ -n "$tg" ] && git -C "$DEST" tag -d "$tg" >/dev/null
  done
fi
git -C "$DEST" tag -a "$TAG" -m "Release $TAG (extracted from ktg-plugin-marketplace monorepo)"

COMMITS="$(git -C "$DEST" rev-list --count HEAD)"
echo "EXTRACT OK $KEY → $DEST ($COMMITS commits, tag $TAG)"