#!/usr/bin/env bash
# generate-coverage-matrix.sh — Component coverage matrix.
# Shows which kernel primitives are used by which surfaces.
# Flags deprecated component usage.
# Usage: bash scripts/generate-coverage-matrix.sh

set -euo pipefail

# ── Kernel primitives (CSS class prefix : JS import name) ──
declare -A PRIMITIVES=(
  [button]="sw-btn|Button"
  [input]="sw-input|sw-field|FormField"
  [dropdown]="sw-dropdown|Dropdown"
  [dialog]="sw-dialog|Dialog|confirm("
  [toast]="sw-toast|toast("
  [menu]="sw-menu|Menu"
  [tabs]="sw-tabs|Tabs"
  [avatar]="sw-avatar|Avatar"
  [spinner]="sw-spinner|Spinner"
  [tooltip]="sw-tooltip|Tooltip"
  [drawer]="sw-drawer|Drawer"
  [banner]="sw-banner|Banner"
)

# Ordered list for consistent output
PRIM_ORDER=(button input dropdown dialog toast menu tabs avatar spinner tooltip drawer banner)

# ── Deprecated patterns ──
DEPRECATED_PATTERNS="btn-primary|btn-small|btn-danger|btn-full|\.toast-container[^-]|popup-menu"

# ── Surfaces to scan ──
declare -A SURFACE_DIRS

# Kernel surfaces
for d in src/js/sw/surfaces/*/; do
  [ -d "$d" ] || continue
  name="$(basename "$d")"
  SURFACE_DIRS["kernel/$name"]="$d"
done

# Shell components
SURFACE_DIRS["kernel/shell"]="src/js/sw/shell/"

# Extension packages
for d in packages/*/; do
  [ -d "$d" ] || continue
  slug="$(basename "$d")"
  SURFACE_DIRS["ext/$slug"]="$d"
done

# Sort surface names
SURFACES=()
while IFS= read -r s; do SURFACES+=("$s"); done < <(printf '%s\n' "${!SURFACE_DIRS[@]}" | sort)

# ── Scan each surface for each primitive ──
declare -A MATRIX  # key="primitive:surface" value="1" or "D" (deprecated)

for surface in "${SURFACES[@]}"; do
  dir="${SURFACE_DIRS[$surface]}"
  [ -d "$dir" ] || continue

  # Gather all JS and CSS in this surface
  content=""
  while IFS= read -r f; do
    content+="$(cat "$f")"$'\n'
  done < <(find "$dir" -type f \( -name '*.js' -o -name '*.css' \) 2>/dev/null)

  for prim in "${PRIM_ORDER[@]}"; do
    patterns="${PRIMITIVES[$prim]}"
    IFS='|' read -ra pats <<< "$patterns"
    for pat in "${pats[@]}"; do
      if echo "$content" | grep -qF "$pat"; then
        MATRIX["$prim:$surface"]="1"
        break
      fi
    done
  done

  # Check for deprecated patterns
  if echo "$content" | grep -qE "$DEPRECATED_PATTERNS"; then
    MATRIX["deprecated:$surface"]="1"
  fi
done

# ── Build markdown table ──
echo "# Component Coverage Matrix"
echo ""
echo "Generated: $(date -u '+%Y-%m-%d %H:%M UTC')"
echo ""

# Header row
header="| Primitive |"
separator="|-----------|"
for surface in "${SURFACES[@]}"; do
  short="${surface#*/}"  # Remove kernel/ or ext/ prefix
  header+=" $short |"
  separator+="------|"
done
echo "$header"
echo "$separator"

# Data rows
for prim in "${PRIM_ORDER[@]}"; do
  row="| **$prim** |"
  for surface in "${SURFACES[@]}"; do
    if [[ -n "${MATRIX["$prim:$surface"]:-}" ]]; then
      row+=" ✓ |"
    else
      row+=" · |"
    fi
  done
  echo "$row"
done

# Deprecated row
row="| ⚠ deprecated |"
has_deprecated=false
for surface in "${SURFACES[@]}"; do
  if [[ -n "${MATRIX["deprecated:$surface"]:-}" ]]; then
    row+=" ⚠ |"
    has_deprecated=true
  else
    row+=" · |"
  fi
done
echo "$row"

echo ""
echo "Legend: ✓ = uses kernel primitive, · = not used, ⚠ = deprecated component detected"
echo ""

# ── Deprecated detail ──
if $has_deprecated; then
  echo "## Deprecated Component Usage"
  echo ""
  for surface in "${SURFACES[@]}"; do
    [[ -z "${MATRIX["deprecated:$surface"]:-}" ]] && continue
    dir="${SURFACE_DIRS[$surface]}"
    echo "### $surface"
    grep -rnE "$DEPRECATED_PATTERNS" "$dir" --include='*.js' --include='*.css' 2>/dev/null | head -10 || true
    echo ""
  done
fi

# ── Summary ──
total_cells=$(( ${#PRIM_ORDER[@]} * ${#SURFACES[@]} ))
used=0
for prim in "${PRIM_ORDER[@]}"; do
  for surface in "${SURFACES[@]}"; do
    [[ -n "${MATRIX["$prim:$surface"]:-}" ]] && used=$((used + 1))
  done
done

echo "---"
echo "Coverage: $used / $total_cells cells ($((used * 100 / total_cells))%)"
if $has_deprecated; then
  echo "STATUS: WARN — deprecated component usage found (see above)"
else
  echo "STATUS: PASS — no deprecated component usage"
fi