#!/bin/bash
set -euo pipefail

# Generate dashboard showing milestones with unblocked/blocked issues
# Usage: ./generate-dashboard.sh [milestone-filter]

MILESTONE_FILTER="${1:-}"

# Get all milestones
milestones_json=$(tea milestones -o json)

# Parse milestone names
milestone_names=$(echo "$milestones_json" | jq -r '.[].title')

# Process each milestone
while IFS= read -r milestone; do
  # Skip if filter provided and doesn't match
  if [[ -n "$MILESTONE_FILTER" && ! "$milestone" =~ $MILESTONE_FILTER ]]; then
    continue
  fi

  echo "## Milestone: $milestone"
  echo ""

  # Get open issues for this milestone
  issues_json=$(tea issues --milestones "$milestone" --state open -o json 2>/dev/null || echo "[]")

  # Skip empty milestones or invalid JSON
  issue_count=$(echo "$issues_json" | jq -e 'length' 2>/dev/null || echo "0")
  if [[ "$issue_count" -eq 0 ]]; then
    echo "No open issues"
    echo ""
    continue
  fi

  # Arrays for categorizing issues
  declare -a unblocked=()
  declare -a blocked=()

  # Process each issue
  while IFS=$'\t' read -r number title; do
    # Check dependencies (tea returns plain text "Issue #N has no dependencies" when empty)
    deps_output=$(tea issues deps list "$number" -o json 2>/dev/null || echo "")

    # If output contains "has no dependencies", treat as empty array
    if [[ "$deps_output" == *"has no dependencies"* ]]; then
      deps_json="[]"
    else
      deps_json="$deps_output"
    fi

    # Count open dependencies
    open_deps=$(echo "$deps_json" | jq -r '[.[] | select(.state == "open")] | length' 2>/dev/null || echo "0")

    if [[ "$open_deps" -eq 0 ]]; then
      # No open blockers - unblocked
      unblocked+=("#$number $title")
    else
      # Has open blockers - blocked
      blocker_list=$(echo "$deps_json" | jq -r '[.[] | select(.state == "open") | "#\(.index)"] | join(", ")')
      blocked+=("#$number $title (blocked by $blocker_list)")
    fi
  done < <(echo "$issues_json" | jq -r '.[] | [.index, .title] | @tsv')

  # Display unblocked issues
  echo "✓ Unblocked (${#unblocked[@]}):"
  if [[ ${#unblocked[@]} -eq 0 ]]; then
    echo "  (none)"
  else
    printf '  %s\n' "${unblocked[@]}"
  fi
  echo ""

  # Display blocked issues
  echo "⊘ Blocked (${#blocked[@]}):"
  if [[ ${#blocked[@]} -eq 0 ]]; then
    echo "  (none)"
  else
    printf '  %s\n' "${blocked[@]}"
  fi
  echo ""

done <<< "$milestone_names"