#!/bin/sh
# bd-hooks-version: 0.26.0
#
# bd (beads) post-checkout hook
#
# This hook syncs the bd database after a branch checkout:
# 1. Checks if any .beads/*.jsonl file was updated
# 2. Runs 'bd sync --import-only --no-git-history' to import changes
#
# Arguments provided by git:
# $1 = ref of previous HEAD
# $2 = ref of new HEAD
# $3 = flag (1 if branch checkout, 0 if file checkout)
#
# Install: cp examples/git-hooks/post-checkout .git/hooks/post-checkout && chmod +x .git/hooks/post-checkout

# Only run on branch checkouts
if [ "$3" != "1" ]; then
    exit 0
fi

# Skip during rebase - git checks out commits during rebase and we must not
# modify working tree files (like deletions.jsonl) or the rebase will fail
if [ -d .git/rebase-merge ] || [ -d .git/rebase-apply ]; then
    exit 0
fi

# Check if bd is available
if ! command -v bd >/dev/null 2>&1; then
    exit 0
fi

# Check if we're in a bd workspace
if [ ! -d .beads ]; then
    exit 0
fi

# Detect git worktree: compare --git-dir and --git-common-dir
GIT_DIR=$(git rev-parse --git-dir 2>/dev/null)
GIT_COMMON_DIR=$(git rev-parse --git-common-dir 2>/dev/null)
if [ -n "$GIT_DIR" ] && [ -n "$GIT_COMMON_DIR" ]; then
    GIT_DIR_ABS=$(cd "$GIT_DIR" 2>/dev/null && pwd || echo "$GIT_DIR")
    GIT_COMMON_DIR_ABS=$(cd "$GIT_COMMON_DIR" 2>/dev/null && pwd || echo "$GIT_COMMON_DIR")
    
    if [ "$GIT_DIR_ABS" != "$GIT_COMMON_DIR_ABS" ]; then
        # We're in a git worktree
        cat >&2 <<'EOF'

╔══════════════════════════════════════════════════════════════════════════╗
║ Welcome to beads in git worktree!                                        ║
╠══════════════════════════════════════════════════════════════════════════╣
║ Note: Daemon mode is not recommended with git worktrees.                 ║
║ Worktrees share the same database, and the daemon may commit changes     ║
║ to the wrong branch.                                                      ║
║                                                                          ║
║ RECOMMENDED: Disable daemon for this session:                            ║
║   export BEADS_NO_DAEMON=1                                               ║
║                                                                          ║
║ For more information:                                                     ║
║   - Run: bd doctor                                                        ║
║   - Read: docs/GIT_INTEGRATION.md (lines 10-53)                          ║
║                                                                          ║
║ Issue tracking: bd-dc9                                                    ║
╚══════════════════════════════════════════════════════════════════════════╝

EOF
    fi
fi

# Check if any JSONL file exists in .beads/
if ! ls .beads/*.jsonl >/dev/null 2>&1; then
    exit 0
fi

# Run bd sync --import-only --no-git-history to import the updated JSONL
# --no-git-history prevents writes to deletions.jsonl (critical during rebase)
if ! output=$(bd sync --import-only --no-git-history 2>&1); then
    echo "Warning: Failed to sync bd changes after checkout" >&2
    echo "$output" >&2
    echo "" >&2
    echo "Run 'bd doctor --fix' to diagnose and repair" >&2
    # Don't fail the checkout, just warn
fi

# Run quick health check (silent on success, hints if issues found)
# This catches version mismatches, outdated hooks, etc.
bd doctor --check-health 2>/dev/null || true

exit 0