#!/bin/bash
# KB Lint — health checks with exit codes
# Usage: ./scripts/lint.sh

set -euo pipefail

KB_DIR="$(cd "$(dirname "$0")/.." && pwd)"
cd "$KB_DIR"

if ! command -v rg &>/dev/null; then
    echo "❌ ripgrep (rg) is required." >&2
    exit 1
fi

broken=0
stale=0
orphan=0

echo "🔍 KB Lint"
echo "==========="
echo ""

# ── P0: Broken wikilinks ──────────────────────────────────
echo "--- P0: Broken Wikilinks ---"

while IFS= read -r match; do
    file="${match%%:*}"
    raw_link="${match#*:}"
    
    # Strip [[ and ]]
    link="${raw_link#\[\[}"
    link="${link%\]\]}"
    
    # Strip alias: [[page|display]] → page
    link="${link%%|*}"
    # Strip anchor: [[page#heading]] → page
    link="${link%%#*}"
    link="$(echo "$link" | xargs)"  # trim whitespace
    
    [ -z "$link" ] && continue
    
    # Look for matching .md file (case-insensitive)
    found=$(find wiki/ -iname "${link}.md" -print -quit 2>/dev/null)
    if [ -z "$found" ]; then
        echo "❌ $file: [[$link]] → not found"
        broken=1
    fi
done < <(rg -noH '\[\[([^]]+)\]\]' wiki/ 2>/dev/null)

if [ "$broken" -eq 0 ]; then
    echo "✅ No broken links"
fi
echo ""

# ── P1: Stale investing pages (>60 days) ─────────────────
echo "--- P1: Stale Investing Pages (>60 days) ---"
if [ -d wiki/investing ]; then
    while IFS= read -r f; do
        [ -z "$f" ] && continue
        modified=$(date -r "$f" +%Y-%m-%d 2>/dev/null || stat -f %Sm -t %Y-%m-%d "$f" 2>/dev/null || echo "?")
        echo "⚠️  $f — last modified $modified"
        stale=1
    done < <(find wiki/investing -name "*.md" -mtime +60 2>/dev/null)
fi
if [ "$stale" -eq 0 ]; then
    echo "✅ All investing pages up to date"
fi
echo ""

# ── P2: Orphan pages ──────────────────────────────────────
echo "--- P2: Possible Orphans ---"
while IFS= read -r page; do
    [ -z "$page" ] && continue
    slug=$(basename "$page" .md)
    refs=$(rg -l "\[\[${slug}(\]\]|\||#)" wiki/ 2>/dev/null | grep -cv "$page" || true)
    if [ "$refs" -eq 0 ]; then
        echo "🔸 $page — no incoming links"
        orphan=1
    fi
done < <(find wiki -name "*.md" 2>/dev/null)

if [ "$orphan" -eq 0 ]; then
    echo "✅ No orphan pages"
fi
echo ""

# ── Result ─────────────────────────────────────────────────
issues=$((broken + stale + orphan))
if [ "$issues" -gt 0 ]; then
    echo "❌ Lint found issues: $broken broken links, $stale stale pages, $orphan orphans"
    exit 1
else
    echo "✅ Lint clean — no issues found"
    exit 0
fi