#!/usr/bin/env bash
# install-hooks.sh — install the Sea Haven security-review git hooks + skill assets.
#
# Two modes:
#   install-hooks.sh --global         Lay the hooks down once for EVERY repo on this machine:
#                                       writes ~/.config/git/hooks/{pre-commit,pre-push}, sets
#                                       git config --global core.hooksPath, and links the skill
#                                       prompt + finding.schema.json into ~/.claude (Path A).
#   install-hooks.sh /path/to/repo    Per-repo install: copy the hooks into <repo>/.git/hooks
#                                       (use when a repo sets its own local core.hooksPath, e.g.
#                                       husky, which would otherwise shadow the global hook).
#   install-hooks.sh --help
#
# The hooks run review.sh --scanners-only (fast, deterministic). The full agentic review is the
# on-demand /sh-security-review skill; the nightly VM sweep is the backstop. Idempotent + re-runnable.
set -euo pipefail

SRC="$(cd "$(dirname "$0")" && pwd)"
GLOBAL_HOOKS="$HOME/.config/git/hooks"
CLAUDE_DIR="$HOME/.claude"

usage() { grep '^#' "$0" | sed 's/^# \{0,1\}//'; }

install_one() {  # install_one <src-hook> <dest-hook>
  local src="$1" dest="$2"
  cp "$src" "$dest"
  chmod +x "$dest"
}

link_asset() {  # link_asset <src-file> <dest-path>  (symlink so the repo stays source of truth)
  local src="$1" dest="$2"
  mkdir -p "$(dirname "$dest")"
  ln -sfn "$src" "$dest"
  echo "  linked $dest -> $src"
}

case "${1:-}" in
  -h|--help|"") usage; exit 0;;

  --global)
    echo "== Installing Sea Haven security-review hooks globally =="
    mkdir -p "$GLOBAL_HOOKS"

    # Warn (don't clobber silently) if a different global hooksPath is already set.
    CURRENT="$(git config --global --get core.hooksPath || true)"
    if [ -n "$CURRENT" ] && [ "$CURRENT" != "$GLOBAL_HOOKS" ]; then
      echo "  WARNING: git config --global core.hooksPath is already '$CURRENT'." >&2
      echo "           Overwriting it with '$GLOBAL_HOOKS'. Re-point manually if that was intentional." >&2
    fi

    install_one "$SRC/hooks/pre-commit" "$GLOBAL_HOOKS/pre-commit"
    install_one "$SRC/hooks/pre-push"   "$GLOBAL_HOOKS/pre-push"
    git config --global core.hooksPath "$GLOBAL_HOOKS"
    echo "  installed pre-commit + pre-push -> $GLOBAL_HOOKS"
    echo "  set git config --global core.hooksPath = $GLOBAL_HOOKS"

    # Path A assets: link the on-demand skill prompt + finding schema into ~/.claude.
    link_asset "$SRC/skill/sh-security-review.md"   "$CLAUDE_DIR/commands/sh-security-review.md"
    link_asset "$SRC/finding.schema.json"           "$CLAUDE_DIR/security-review/finding.schema.json"

    echo
    echo "Done. Every repo on this machine is now gated by review.sh --scanners-only before push."
    echo "Caveats: a repo that sets its OWN local core.hooksPath (e.g. husky) overrides this global hook"
    echo "         — run 'install-hooks.sh <that-repo>' to gate it per-repo. Skip a repo with a"
    echo "         .security-review-skip file at its root; bypass once with 'git push --no-verify'."
    ;;

  --*)
    echo "unknown option: $1" >&2; usage; exit 2;;

  *)
    REPO="$1"
    [ -d "$REPO/.git" ] || { echo "not a git repo: $REPO" >&2; exit 1; }
    echo "== Installing security-review hooks into $REPO/.git/hooks =="
    for h in pre-commit pre-push; do
      DEST="$REPO/.git/hooks/$h"
      [ -f "$DEST" ] && echo "  warning: existing $h hook at $DEST will be overwritten" >&2
      install_one "$SRC/hooks/$h" "$DEST"
      echo "  installed $h -> $DEST"
    done
    echo "note: hooks run deterministic scanners only; full review is /sh-security-review (on demand)."
    ;;
esac