#!/usr/bin/env bash
# worktree-audit.sh — Quick diagnostic: list all worktrees on the system
# Use this to understand the scope before running the cleanup script.
#
# Output: CSV to stdout, summary to stderr

set -euo pipefail

echo "=== Worktree Audit — $(date '+%Y-%m-%d %H:%M:%S') ===" >&2

# Find repos
REPOS=$(find "$HOME" -maxdepth 5 -name ".git" -type d \
    -not -path "*/node_modules/*" \
    -not -path "*/.cache/*" \
    -not -path "*/vendor/*" \
    2>/dev/null || true)

echo "repo_path,worktree_path,branch,locked,head_commit,hours_since_mod" 

TOTAL=0
while IFS= read -r gitdir; do
    repo="${gitdir%/.git}"
    cd "$repo" || continue

    wt_list=$(git worktree list --porcelain 2>/dev/null) || continue
    [[ -z "$wt_list" ]] && continue

    current_path=""
    current_locked="no"
    current_head=""

    while IFS= read -r line; do
        if [[ "$line" =~ ^worktree\ (.+)$ ]]; then
            current_path="${BASH_REMATCH[1]}"
            current_locked="no"
            current_head=""
        elif [[ "$line" == "locked" ]]; then
            current_locked="yes"
        elif [[ "$line" =~ ^HEAD\ (.+)$ ]]; then
            current_head="${BASH_REMATCH[1]}"
        elif [[ -z "$line" ]] && [[ -n "$current_path" ]]; then
            hours="N/A"
            if [[ -d "$current_path" ]]; then
                last_mod=$(find "$current_path" -type f -not -path '*/.git/*' -printf '%T@\n' 2>/dev/null | sort -rn | head -1)
                if [[ -n "$last_mod" ]]; then
                    now=$(date +%s)
                    hours=$(( (now - ${last_mod%.*}) / 3600 ))
                fi
            fi
            echo "$repo,$current_path,$current_head,$current_locked,,$hours"
            TOTAL=$((TOTAL + 1))
            current_path=""
            current_locked="no"
            current_head=""
        fi
    done <<< "$wt_list"

    # Last entry
    if [[ -n "$current_path" ]]; then
        hours="N/A"
        if [[ -d "$current_path" ]]; then
            last_mod=$(find "$current_path" -type f -not -path '*/.git/*' -printf '%T@\n' 2>/dev/null | sort -rn | head -1)
            if [[ -n "$last_mod" ]]; then
                now=$(date +%s)
                hours=$(( (now - ${last_mod%.*}) / 3600 ))
            fi
        fi
        echo "$repo,$current_path,$current_head,$current_locked,,$hours"
        TOTAL=$((TOTAL + 1))
    fi
done <<< "$REPOS"

echo "" >&2
echo "Total worktrees: $TOTAL" >&2
echo "Target: <20" >&2
echo "" >&2
echo "To clean up: ./worktree-cleanup.sh --dry-run" >&2