#!/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 "===== ⑦ init MERGES into an existing shell (agents/skills/hooks preserved) ====="
EXP="$WORK/existing"; mkdir -p "$EXP/.claude/agents" "$EXP/.claude/skills" "$EXP/.codex"
cat > "$EXP/.claude/settings.json" <<'EOF'
{ "model": "claude-opus-4-8", "hooks": { "PreToolUse": [ {"matcher":"*","hooks":[{"type":"command","command":"my-existing-hook.sh"}]} ] } }
EOF
echo "agent" > "$EXP/.claude/agents/reviewer.md"; echo "skill" > "$EXP/.claude/skills/deploy.md"
printf '[hooks]\nenabled = true\n\n[mytool]\nfoo = 1\n' > "$EXP/.codex/config.toml"
( cd "$EXP" && "$CASAN" init --project existing-app >/dev/null 2>&1 )
py_check() { python3 - "$1" "$2" <<'PY'
import json,sys
d=json.load(open(sys.argv[1]))
cmds=[h["command"] for ev in d.get("hooks",{}).values() for g in ev for h in g["hooks"]]
sys.exit(0 if any(sys.argv[2] in c for c in cmds) else 1)
PY
}
[ -f "$EXP/.claude/agents/reviewer.md" ] && [ -f "$EXP/.claude/skills/deploy.md" ] && pass "existing agents/skills preserved" || fail "agents/skills lost"
py_check "$EXP/.claude/settings.json" "my-existing-hook" && pass "existing Claude hook preserved (not clobbered)" || fail "existing hook clobbered"
py_check "$EXP/.claude/settings.json" "claude_hook.py" && pass "CASAN Claude hook merged in" || fail "CASAN hook not merged"
[ "$(python3 -c 'import json;print(json.load(open("'"$EXP"'/.claude/settings.json")).get("model"))')" = "claude-opus-4-8" ] && pass "unrelated settings key (model) preserved" || fail "model key lost"
grep -q '\[mytool\]' "$EXP/.codex/config.toml" && pass "existing codex [mytool] preserved" || fail "mytool lost"
[ "$(grep -c '^\[hooks\]' "$EXP/.codex/config.toml")" = "1" ] && pass "codex config.toml has no duplicate [hooks] table" || fail "duplicate [hooks]"
# idempotent
( cd "$EXP" && "$CASAN" init --project existing-app >/dev/null 2>&1 )
N=$(python3 -c 'import json;d=json.load(open("'"$EXP"'/.claude/settings.json"));print(sum(1 for g in d["hooks"]["PreToolUse"] for h in g["hooks"] if "claude_hook.py" in h["command"]))')
[ "$N" = "1" ] && pass "re-running init is idempotent (no duplicate CASAN hook)" || fail "init duplicated CASAN hook (n=$N)"

echo "===== ⑧ level-aware install + init (packaging/levels.json) ====="
# core install: no devkit, casan init unavailable
CORE_HOME="$WORK/home-core/.casan"
CASAN_HOME="$CORE_HOME" sh "$REPO_ROOT/install.sh" --level core >/dev/null 2>&1
[ -d "$CORE_HOME/current/packages/casan-devkit" ] && fail "core install pulled in devkit" || pass "core level excludes devkit"
[ "$(cat "$CORE_HOME/current/.casan-level" 2>/dev/null)" = "core" ] && pass "install records level=core" || fail "no .casan-level=core"
# Always run init inside a THROWAWAY dir — never the ambient cwd.
CINIT="$WORK/core-init-proj"; mkdir -p "$CINIT"
CI_OUT=$( ( cd "$CINIT" && "$CORE_HOME/bin/casan" init 2>&1 | head -1 ) || true )
echo "$CI_OUT" | grep -q "requires the casan-devkit" && pass "casan init unavailable on core (clear message)" || fail "core init did not fail clearly ($CI_OUT)"

# enterprise refused, platform refused-with-guidance
ERC=0; CASAN_HOME="$WORK/home-e/.casan" sh "$REPO_ROOT/install.sh" --level enterprise >/dev/null 2>&1 || ERC=$?
[ "$ERC" -eq 3 ] && pass "install --level enterprise refused (rc=3, no fake-complete)" || fail "enterprise not refused (rc=$ERC)"
PRC=0; CASAN_HOME="$WORK/home-p/.casan" sh "$REPO_ROOT/install.sh" --level platform >/dev/null 2>&1 || PRC=$?
[ "$PRC" -ne 0 ] && pass "install --level platform refused (preview service, rc=$PRC)" || fail "platform install pretended to succeed"

# devkit install: init --level differentiation
DK_HOME="$WORK/home-dk/.casan"
CASAN_HOME="$DK_HOME" sh "$REPO_ROOT/install.sh" --level devkit >/dev/null 2>&1
DKC="$DK_HOME/bin/casan"
L1="$WORK/l1"; mkdir -p "$L1"; ( cd "$L1" && "$DKC" init --level 1 --project l1 >/dev/null 2>&1 )
( [ ! -d "$L1/.gitea" ] && [ ! -d "$L1/apps" ] ) && pass "init --level 1 = gate/hooks only (no CI/domain)" || fail "L1 wrote devkit extras"
[ -f "$L1/.claude/settings.json" ] && pass "init --level 1 still writes Plan-20 hooks (core feature)" || fail "L1 missing hooks"
L2="$WORK/l2"; mkdir -p "$L2"; ( cd "$L2" && "$DKC" init --level 2 --project l2 >/dev/null 2>&1 )
( [ -f "$L2/.gitea/workflows/casan-ci.yml" ] && [ -d "$L2/apps/l2/domain" ] ) && pass "init --level 2 adds CI + domain-pack" || fail "L2 missing devkit extras"
L4RC=0; L4="$WORK/l4"; mkdir -p "$L4"; ( cd "$L4" && "$DKC" init --level 4 --project l4 >/dev/null 2>&1 ) || L4RC=$?
[ "$L4RC" -eq 3 ] && pass "init --level 4 (enterprise) refused (rc=3)" || fail "L4 init not refused (rc=$L4RC)"
LVL=$( ( cd "$L2" && "$DKC" level show ) | python3 -c 'import json,sys;print(json.load(sys.stdin)["project_target_level"])' 2>/dev/null)
[ "$LVL" = "2" ] && pass "casan level show reports project target level" || fail "level show wrong ($LVL)"

echo "===== ⑨ SAFETY: init refuses to adopt a CASAN source hub into itself ====="
HUB="$WORK/fakehub"; mkdir -p "$HUB/packages/casan-harness/scripts/bash"
echo '#casan' > "$HUB/packages/casan-harness/scripts/bash/casan-harness.sh"
GRC=0; ( cd "$HUB" && "$DKC" init --project hub >/dev/null 2>"$WORK/hub.err" ) || GRC=$?
[ "$GRC" -eq 65 ] && pass "init refuses a source hub (rc=65)" || fail "source-hub not refused (rc=$GRC)"
[ ! -f "$HUB/.claude/settings.json" ] && pass "no hooks written into the refused hub" || fail "hooks written into source hub"
( cd "$HUB" && "$DKC" init --project hub --force >/dev/null 2>&1 ) && pass "--force overrides the source-hub guard" || fail "--force did not override guard"

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