#!/usr/bin/env bash
# Check internal doc links in docs/ (relative paths). Report broken file links.
# Usage: ./scripts/check-doc-links.sh
# Run from repo root.

set -e
REPO_ROOT="$(cd "$(dirname "$0")/.." && pwd)"
cd "$REPO_ROOT"
DOCS="$REPO_ROOT/docs"
FAIL=0

check_file() {
  local f="$1"
  local from_dir="${f#$REPO_ROOT/}"
  from_dir="$(dirname "$from_dir")"
  while IFS= read -r url; do
    [[ -z "$url" ]] && continue
    path_only="${url%%#*}"
    [[ -z "$path_only" ]] && continue
    [[ "$path_only" == https://* ]] && continue
    [[ "$path_only" == http://* ]] && continue
    [[ "$path_only" == mailto:* ]] && continue
    # Resolve relative to source file dir
    if [[ "$path_only" == /* ]]; then
      resolved="${path_only#/}"
    elif [[ -z "$from_dir" || "$from_dir" == "." ]]; then
      resolved="$path_only"
    else
      resolved="$from_dir/$path_only"
      resolved="$(echo "$resolved" | sed 's|/\./|/|g')"
      while [[ "$resolved" == *"/../"* ]] || [[ "$resolved" == *"/.." ]]; do
        resolved="$(echo "$resolved" | sed 's|/[^/]*/\.\./|/|;s|/[^/]*/\.\.$||')"
      done
    fi
    target="$REPO_ROOT/$resolved"
    if [[ -d "$target" ]]; then continue; fi
    if [[ ! -f "$target" ]]; then
      echo "BROKEN: $f -> $resolved (target missing)"
      FAIL=1
    fi
  done < <(grep -ohE '\]\([^)]+\)' "$f" 2>/dev/null | sed 's/^](//;s/)$//')
}

echo "=== Checking internal doc links under docs/ ==="
while IFS= read -r -d '' f; do
  check_file "$f"
done < <(find "$DOCS" -name "*.md" -print0 2>/dev/null)

if [[ "$FAIL" -eq 0 ]]; then
  echo "No broken internal links found."
fi
exit "$FAIL"