#!/usr/bin/env bash
# Pre-commit hook: enforce autoresearch repo invariants.
# Install: git config core.hooksPath .githooks

set -euo pipefail

FROZEN_FILES=("program.md" "eval.py" "meta_journal.md")
GLOBAL_FILES=("RESEARCH_JOURNAL.md" "results.tsv")
YELLOW='\033[1;33m'
RED='\033[0;31m'
NC='\033[0m'  # no color

CURRENT_BRANCH=$(git rev-parse --abbrev-ref HEAD 2>/dev/null || echo "unknown")
IS_WORKTREE=$(git rev-parse --git-dir | grep -q "worktrees" && echo "yes" || echo "no")
META_MODE="${META_MODE:-0}"

# ── 1. Warn on direct commits to main ────────────────────────────────────────
if [[ "$CURRENT_BRANCH" == "main" && "$META_MODE" != "1" ]]; then
    echo -e "${YELLOW}[hook] WARNING: committing directly to main.${NC}"
    echo "  Agents should work in worktrees: just worktree {slug}"
    echo "  To suppress: META_MODE=1 git commit ..."
    echo ""
    echo -n "  Are you sure? (y/N) "
    read -r reply < /dev/tty
    if [[ "$reply" != "y" && "$reply" != "Y" ]]; then
        echo "Aborted."
        exit 1
    fi
fi

# ── 2. Protect FROZEN files ───────────────────────────────────────────────────
if [[ "$META_MODE" != "1" ]]; then
    for f in "${FROZEN_FILES[@]}"; do
        if git diff --cached --name-only | grep -qx "$f"; then
            echo -e "${RED}[hook] ERROR: '$f' is FROZEN.${NC}"
            echo "  Only edit in meta-mode: META_MODE=1 git commit ..."
            echo "  See meta_journal.md for instructions."
            exit 1
        fi
    done
fi

# ── 3. Warn about GLOBAL files committed from worktrees ───────────────────────
if [[ "$IS_WORKTREE" == "yes" || "$CURRENT_BRANCH" != "main" ]]; then
    for f in "${GLOBAL_FILES[@]}"; do
        if git diff --cached --name-only | grep -qx "$f"; then
            echo -e "${YELLOW}[hook] WARNING: '$f' is a GLOBAL file.${NC}"
            echo "  It should only be committed from main (not from worktree branches)."
            echo "  Agents: append to the root project copy instead:"
            echo "    echo '...' >> \$(git rev-parse --show-toplevel)/$f"
            echo ""
            echo -n "  Commit anyway? (y/N) "
            read -r reply < /dev/tty
            if [[ "$reply" != "y" && "$reply" != "Y" ]]; then
                echo "Aborted. Unstage with: git reset HEAD $f"
                exit 1
            fi
        fi
    done
fi

exit 0