#!/bin/bash
# validate-workflows.sh - Validate Gitea Actions workflows
# Sprint: SPRINT_20251226_001_CICD
#
# Usage:
#   ./validate-workflows.sh              # Validate all workflows
#   ./validate-workflows.sh --strict     # Fail on any warning
#   ./validate-workflows.sh --verbose    # Show detailed output

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
REPO_ROOT="$(cd "$SCRIPT_DIR/../../.." && pwd)"
WORKFLOWS_DIR="$REPO_ROOT/.gitea/workflows"
SCRIPTS_DIR="$REPO_ROOT/.gitea/scripts"

# Configuration
STRICT_MODE=false
VERBOSE=false

# Counters
PASSED=0
FAILED=0
WARNINGS=0

# Colors (if terminal supports it)
if [[ -t 1 ]]; then
  RED='\033[0;31m'
  GREEN='\033[0;32m'
  YELLOW='\033[0;33m'
  NC='\033[0m' # No Color
else
  RED=''
  GREEN=''
  YELLOW=''
  NC=''
fi

# Parse arguments
while [[ $# -gt 0 ]]; do
  case $1 in
    --strict)
      STRICT_MODE=true
      shift
      ;;
    --verbose)
      VERBOSE=true
      shift
      ;;
    --help)
      echo "Usage: $0 [OPTIONS]"
      echo ""
      echo "Options:"
      echo "  --strict     Fail on any warning"
      echo "  --verbose    Show detailed output"
      echo "  --help       Show this help message"
      exit 0
      ;;
    *)
      echo "Unknown option: $1"
      exit 1
      ;;
  esac
done

echo "=== Gitea Workflow Validation ==="
echo "Workflows: $WORKFLOWS_DIR"
echo "Scripts: $SCRIPTS_DIR"
echo ""

# Check if workflows directory exists
if [[ ! -d "$WORKFLOWS_DIR" ]]; then
  echo -e "${RED}ERROR: Workflows directory not found${NC}"
  exit 1
fi

# Function to validate YAML syntax
validate_yaml_syntax() {
  local file=$1
  local name=$(basename "$file")

  # Try python yaml parser first
  if command -v python3 &>/dev/null; then
    if python3 -c "import yaml; yaml.safe_load(open('$file'))" 2>/dev/null; then
      return 0
    else
      return 1
    fi
  # Fallback to ruby if available
  elif command -v ruby &>/dev/null; then
    if ruby -ryaml -e "YAML.load_file('$file')" 2>/dev/null; then
      return 0
    else
      return 1
    fi
  else
    # Can't validate YAML, warn and skip
    return 2
  fi
}

# Function to extract script references from a workflow
extract_script_refs() {
  local file=$1
  # Look for patterns like: .gitea/scripts/*, scripts/*, ./devops/scripts/*
  grep -oE '(\.gitea/scripts|scripts|devops/scripts)/[a-zA-Z0-9_/-]+\.(sh|py|js|mjs)' "$file" 2>/dev/null | sort -u || true
}

# Function to check if a script exists
check_script_exists() {
  local script_path=$1
  local full_path="$REPO_ROOT/$script_path"

  if [[ -f "$full_path" ]]; then
    return 0
  else
    return 1
  fi
}

# Validate each workflow file
echo "=== Validating Workflow Syntax ==="
for workflow in "$WORKFLOWS_DIR"/*.yml "$WORKFLOWS_DIR"/*.yaml; do
  [[ -e "$workflow" ]] || continue

  name=$(basename "$workflow")

  if [[ "$VERBOSE" == "true" ]]; then
    echo "Checking: $name"
  fi

  result=$(validate_yaml_syntax "$workflow")
  exit_code=$?

  if [[ $exit_code -eq 0 ]]; then
    echo -e "  ${GREEN}[PASS]${NC} $name - YAML syntax valid"
    ((PASSED++))
  elif [[ $exit_code -eq 2 ]]; then
    echo -e "  ${YELLOW}[SKIP]${NC} $name - No YAML parser available"
    ((WARNINGS++))
  else
    echo -e "  ${RED}[FAIL]${NC} $name - YAML syntax error"
    ((FAILED++))
  fi
done

echo ""
echo "=== Validating Script References ==="

# Check all script references
MISSING_SCRIPTS=()
for workflow in "$WORKFLOWS_DIR"/*.yml "$WORKFLOWS_DIR"/*.yaml; do
  [[ -e "$workflow" ]] || continue

  name=$(basename "$workflow")
  refs=$(extract_script_refs "$workflow")

  if [[ -z "$refs" ]]; then
    if [[ "$VERBOSE" == "true" ]]; then
      echo "  $name: No script references found"
    fi
    continue
  fi

  while IFS= read -r script_ref; do
    [[ -z "$script_ref" ]] && continue

    if check_script_exists "$script_ref"; then
      if [[ "$VERBOSE" == "true" ]]; then
        echo -e "  ${GREEN}[OK]${NC} $name -> $script_ref"
      fi
    else
      echo -e "  ${RED}[MISSING]${NC} $name -> $script_ref"
      MISSING_SCRIPTS+=("$name: $script_ref")
      ((WARNINGS++))
    fi
  done <<< "$refs"
done

# Check that .gitea/scripts directories exist
echo ""
echo "=== Validating Script Directory Structure ==="
EXPECTED_DIRS=(build test validate sign release metrics evidence util)
for dir in "${EXPECTED_DIRS[@]}"; do
  dir_path="$SCRIPTS_DIR/$dir"
  if [[ -d "$dir_path" ]]; then
    script_count=$(find "$dir_path" -maxdepth 1 -name "*.sh" -o -name "*.py" 2>/dev/null | wc -l)
    echo -e "  ${GREEN}[OK]${NC} $dir/ ($script_count scripts)"
  else
    echo -e "  ${YELLOW}[WARN]${NC} $dir/ - Directory not found"
    ((WARNINGS++))
  fi
done

# Summary
echo ""
echo "=== Validation Summary ==="
echo -e "  Passed:   ${GREEN}$PASSED${NC}"
echo -e "  Failed:   ${RED}$FAILED${NC}"
echo -e "  Warnings: ${YELLOW}$WARNINGS${NC}"

if [[ ${#MISSING_SCRIPTS[@]} -gt 0 ]]; then
  echo ""
  echo "Missing script references:"
  for ref in "${MISSING_SCRIPTS[@]}"; do
    echo "  - $ref"
  done
fi

# Exit code
if [[ $FAILED -gt 0 ]]; then
  echo ""
  echo -e "${RED}FAILED: $FAILED validation(s) failed${NC}"
  exit 1
fi

if [[ "$STRICT_MODE" == "true" && $WARNINGS -gt 0 ]]; then
  echo ""
  echo -e "${YELLOW}STRICT MODE: $WARNINGS warning(s) treated as errors${NC}"
  exit 1
fi

echo ""
echo -e "${GREEN}All validations passed!${NC}"