#!/usr/bin/env bash
# land-branch.sh — solo-git integrate gate for sm121-launcher.
#
# Usage:
#   bash scripts/land-branch.sh "<conventional-commit-message>"
#
# Runs all quality gates, blocks AI-attribution footers, commits staged
# changes onto the current branch, and pushes to origin.
#
# Designed for the solo-git workflow (workflow_mode: solo-git in
# specs/state.yaml). When work is on a feature branch, the caller is
# expected to have already squash-merged onto main (or run from main
# directly with staged changes).
#
# Exit codes:
#   0 — landed successfully
#   1 — gates failed, commit blocked, or push rejected

set -euo pipefail

cd "$(dirname "$0")/.."

if [ -t 2 ]; then
    RED=$'\033[31m'; GREEN=$'\033[32m'; YELLOW=$'\033[33m'; RESET=$'\033[0m'
else
    RED=""; GREEN=""; YELLOW=""; RESET=""
fi

step() { printf '%s==> %s%s\n' "$YELLOW" "$*" "$RESET" >&2; }
ok()   { printf '%s  ✓ %s%s\n' "$GREEN"  "$*" "$RESET" >&2; }
die()  { printf '%s  ✗ %s%s\n' "$RED"    "$*" "$RESET" >&2; exit 1; }

# ── Args ──────────────────────────────────────────────────────────────
if [ "$#" -lt 1 ]; then
    echo "Usage: $0 \"<conventional-commit-message>\"" >&2
    exit 1
fi
COMMIT_MSG="$1"

# ── 1. Quality gates ──────────────────────────────────────────────────
step "Running quality gates (make check)"
if ! make check; then
    die "Quality gates failed — commit aborted"
fi
ok "gates passed"

# ── 2. Conventional Commit check ───────────────────────────────────────
step "Verifying conventional commit format"
if ! echo "$COMMIT_MSG" | grep -qE '^(feat|fix|docs|style|refactor|perf|test|build|ci|chore|revert)(\(.+\))?!?: .+$'; then
    die "Commit message does not follow Conventional Commits: $COMMIT_MSG"
fi
ok "commit message is conventional"

# ── 3. Block AI attribution ────────────────────────────────────────────
step "Checking for AI attribution footers"
if echo "$COMMIT_MSG" | grep -qiE 'co[- ]authored[- ]by'; then
    die "Co-authored-by footer detected — blocked by P1 rule (CONVENTIONS.md § Git Attribution)"
fi
ok "no AI attribution"

# ── 4. Commit staged changes ───────────────────────────────────────────
step "Committing staged changes"
if ! git diff --cached --quiet; then
    git commit -m "$COMMIT_MSG"
    ok "changes committed"
else
    echo "  (no staged changes to commit)"
fi

# ── 5. Push ───────────────────────────────────────────────────────────
step "Pushing to origin"
BRANCH=$(git symbolic-ref --short HEAD)
if git push origin "$BRANCH"; then
    ok "pushed to origin/$BRANCH"
else
    die "push failed — check for remote divergence"
fi

echo
printf '%sLanded: %s%s\n' "$GREEN" "$COMMIT_MSG" "$RESET"