#!/usr/bin/env bash
set -uo pipefail

# CASAN Plan-21 — hybrid install + `casan init` acceptance tests.
#
# Proves the codegraph-style flow: global install once, then per-project
# `casan init` that writes CONFIG ONLY (no harness copy), with a pin+verify
# integrity guarantee on the shared harness. Deterministic, offline.

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
REPO_ROOT="$(cd "$SCRIPT_DIR/../../.." && pwd)"

PASS=0; FAIL=0
pass() { echo "PASS: $1"; PASS=$((PASS + 1)); }
fail() { echo "FAIL: $1"; FAIL=$((FAIL + 1)); }

WORK="$(mktemp -d)"
export CASAN_HOME="$WORK/home/.casan"
export CASAN_SRC="$REPO_ROOT"
export CASAN_NO_PATH_LINK=1
cleanup() { rm -rf "$WORK"; }
trap cleanup EXIT

CASAN="$CASAN_HOME/bin/casan"

echo "===== ① global install ====="
if sh "$REPO_ROOT/install.sh" >/dev/null 2>&1; then pass "install.sh completes"; else fail "install.sh failed"; fi
[[ -x "$CASAN" ]] && pass "global launcher created" || fail "launcher missing"
[[ -f "$CASAN_HOME/current/.harness-hash" ]] && pass "integrity hash recorded at install" || fail "no .harness-hash"
"$CASAN" version >/dev/null 2>&1 && pass "casan version works via launcher" || fail "casan version failed"

echo "===== ② casan init (config only, no harness copy) ====="
PROJ="$WORK/proj/my-app"; mkdir -p "$PROJ"; echo '{"name":"x"}' > "$PROJ/package.json"
( cd "$PROJ" && "$CASAN" init --project my-app --mode enforce >/dev/null 2>&1 ) \
  && pass "casan init completes" || fail "casan init failed"
for f in .casan/config.json .casan/version.lock .casan/agentic.env .claude/settings.json .codex/hooks.json .specify/.gitignore; do
  [[ -f "$PROJ/$f" ]] && pass "init wrote $f" || fail "init missing $f"
done
if [[ -d "$PROJ/packages/casan-harness" ]]; then fail "harness was copied into the repo (should not be)"; else pass "harness NOT copied into repo (hybrid model)"; fi

echo "===== ③ version.lock pins the installed harness ====="
LOCK_HASH="$(python3 -c 'import json;print(json.load(open("'"$PROJ"'/.casan/version.lock"))["harness_hash"])')"
REC_HASH="$(cat "$CASAN_HOME/current/.harness-hash")"
[[ -n "$LOCK_HASH" && "$LOCK_HASH" == "$REC_HASH" ]] && pass "version.lock pins the installed gate-code hash" || fail "lock hash mismatch ($LOCK_HASH vs $REC_HASH)"

echo "===== ④ verify-harness: ok before tamper, drift after ====="
( cd "$PROJ" && "$CASAN" verify-harness >/dev/null 2>&1 ) && pass "verify-harness OK on a clean install" || fail "verify-harness reported drift on clean install"
echo "# tampered $(date)" >> "$CASAN_HOME/current/packages/casan-harness/scripts/bash/security-check.sh"
VRC=0; ( cd "$PROJ" && "$CASAN" verify-harness >/dev/null 2>"$WORK/vh.err" ) || VRC=$?
[[ "$VRC" -eq 3 ]] && pass "verify-harness detects tamper (rc=3)" || fail "tamper not detected (rc=$VRC)"
grep -q "HARNESS_INTEGRITY_DRIFT" "$WORK/vh.err" && pass "drift message emitted" || fail "no drift message"

echo "===== ⑤ agentic bridge runs against the PROJECT state via GLOBAL harness ====="
BR="$CASAN_HOME/current/packages/casan-harness/scripts/python/agentic_bridge.py"
B=$(CASAN_APP_ROOT="$PROJ" CASAN_AGENTIC_ENFORCEMENT_MODE=enforce \
    bash -c 'echo '\''{"op":"begin","client":"claude-code","project":"'"$PROJ"'","session":"s","prompt":"add fn","integration_mode":"project_hook"}'\'' | python3 "'"$BR"'" run')
echo "$B" | grep -q '"decision": "allow"' && pass "bridge admits a normal turn via the global harness" || fail "bridge begin failed ($B)"
if find "$PROJ/.specify" -name 'turn-*.json' | grep -q .; then pass "admission state lands in the PROJECT .specify"; else fail "no admission state in project"; fi
if [[ -d "$CASAN_HOME/current/.specify" ]]; then fail "runtime state leaked into the global install"; else pass "no runtime state in the global install"; fi

echo "===== ⑥ init defaults project id from dir name + is re-runnable ====="
PROJ2="$WORK/proj2/Some_App"; mkdir -p "$PROJ2"
( cd "$PROJ2" && "$CASAN" init >/dev/null 2>&1 ) && pass "init works with a defaulted project id" || fail "init default id failed"
PID=$(python3 -c 'import json;print(json.load(open("'"$PROJ2"'/.casan/config.json"))["project_id"])' 2>/dev/null)
[[ "$PID" =~ ^[a-z][a-z0-9-]{1,62}$ ]] && pass "defaulted project id is sanitized ($PID)" || fail "bad default project id ($PID)"

echo ""
echo "===== HYBRID INSTALL SUMMARY: PASS=$PASS FAIL=$FAIL ====="
[[ "$FAIL" -eq 0 ]] || exit 1