#!/usr/bin/env bash
# ──────────────────────────────────────────────────────────────────
# CxIDE — commit-msg hook
# Enforces conventional commit message format.
# Install: cp hooks/commit-msg .git/hooks/commit-msg
# ──────────────────────────────────────────────────────────────────
set -euo pipefail

COMMIT_MSG_FILE="$1"
MSG="$(head -1 "$COMMIT_MSG_FILE")"

RED='\033[0;31m'; GREEN='\033[0;32m'; YELLOW='\033[0;33m'; RESET='\033[0m'

# ─── Conventional Commits format ─────────────────────────────────
# type(scope): description
# Types: feat, fix, refactor, docs, test, build, ci, chore, perf, style, agent
PATTERN='^(feat|fix|refactor|docs|test|build|ci|chore|perf|style|agent)(\([a-z0-9-]+\))?: .{3,72}$'

if ! echo "$MSG" | grep -qE "$PATTERN"; then
    echo ""
    printf "${RED}✗ Invalid commit message format${RESET}\n"
    echo ""
    echo "  Expected: type(scope): description"
    echo ""
    echo "  Types:  feat, fix, refactor, docs, test, build, ci, chore, perf, style, agent"
    echo "  Scopes: core, agent, views, models, services, vm, engine, tools (optional)"
    echo ""
    echo "  Examples:"
    echo "    feat(agent): add code review tool"
    echo "    fix(core): correct cyclomatic complexity for switch"
    echo "    docs: update build instructions"
    echo "    refactor(views): split sidebar into components"
    echo ""
    printf "  Your message: ${YELLOW}%s${RESET}\n" "$MSG"
    echo ""
    exit 1
fi

# ─── Reject WIP on main/master ──────────────────────────────────
BRANCH="$(git symbolic-ref --short HEAD 2>/dev/null || echo '')"
if [[ "$BRANCH" == "main" || "$BRANCH" == "master" ]]; then
    if echo "$MSG" | grep -qiE '^(wip|fixup|squash)'; then
        printf "${RED}✗ WIP/fixup/squash commits not allowed on %s${RESET}\n" "$BRANCH"
        exit 1
    fi
fi

printf "${GREEN}✓${RESET} Commit message OK\n"