#!/usr/bin/env bash
# Validate required config files and optional env vars before deployment/scripts
# Recommendation: docs/10-best-practices/IMPLEMENTATION_CHECKLIST.md (Configuration validation)
# Usage: ./scripts/validation/validate-config-files.sh [--dry-run]
#   --dry-run  Print what would be validated and exit 0 (no file checks).

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
PROJECT_ROOT="$(cd "$SCRIPT_DIR/../.." && pwd)"

DRY_RUN=false
for a in "$@"; do [[ "$a" == "--dry-run" ]] && DRY_RUN=true && break; done

log_info() { echo "[INFO] $1"; }
log_ok() { echo "[OK] $1"; }
log_warn() { echo "[WARN] $1"; }
log_err() { echo "[ERROR] $1"; }

ERRORS=0

# Required config paths (adjust per project)
REQUIRED_FILES="${VALIDATE_REQUIRED_FILES:-}"
# Example: REQUIRED_FILES="/path/to/config.toml /path/to/.env"

# Optional env vars to warn if missing (default empty = no warnings; set VALIDATE_OPTIONAL_ENV for Proxmox API checks)
OPTIONAL_ENV="${VALIDATE_OPTIONAL_ENV:-}"

check_file() {
  local f="$1"
  if [[ -f "$f" ]]; then
    log_ok "Found: $f"
    return 0
  else
    log_err "Missing required file: $f"
    ERRORS=$((ERRORS + 1))
    return 1
  fi
}

check_env() {
  local name="$1"
  if [[ -z "${!name:-}" ]]; then
    log_warn "Optional env not set: $name"
    return 1
  else
    log_ok "Env set: $name"
    return 0
  fi
}

if $DRY_RUN; then
  echo "=== Validation (--dry-run: would check) ==="
  echo "  REQUIRED_FILES: ${REQUIRED_FILES:-<default: config/ip-addresses.conf, .env.example, token-mapping*.json>}"
  echo "  OPTIONAL_ENV: ${OPTIONAL_ENV:-<empty; set VALIDATE_OPTIONAL_ENV for Proxmox API vars>}"
  exit 0
fi

if [[ -n "$REQUIRED_FILES" ]]; then
  for f in $REQUIRED_FILES; do
    check_file "$f"
  done
else
  # Default: check common locations
  [[ -d "$PROJECT_ROOT/config" ]] && check_file "$PROJECT_ROOT/config/ip-addresses.conf" || true
  [[ -f "$PROJECT_ROOT/.env.example" ]] && log_ok ".env.example present (copy to .env and fill)" || true
  # Token mapping (Chain 138 ↔ Mainnet): optional but validate structure if present
  if [[ -f "$PROJECT_ROOT/config/token-mapping.json" ]]; then
    log_ok "Found: config/token-mapping.json"
    if command -v jq &>/dev/null; then
      if jq -e '.tokens | type == "array"' "$PROJECT_ROOT/config/token-mapping.json" &>/dev/null; then
        log_ok "token-mapping.json: valid JSON with .tokens array"
      else
        log_err "token-mapping.json: invalid or missing .tokens array"
        ERRORS=$((ERRORS + 1))
      fi
    fi
  elif [[ -f "$PROJECT_ROOT/config/token-mapping-multichain.json" ]] && command -v jq &>/dev/null && jq -e '.pairs | type == "array"' "$PROJECT_ROOT/config/token-mapping-multichain.json" &>/dev/null; then
    log_ok "Token mapping: using config/token-mapping-multichain.json (relay fallback)"
  else
    log_warn "Optional config/token-mapping.json not found (relay uses fallback mapping)"
  fi
  if [[ -f "$PROJECT_ROOT/config/token-mapping-multichain.json" ]]; then
    log_ok "Found: config/token-mapping-multichain.json"
    if command -v jq &>/dev/null; then
      if jq -e '.pairs | type == "array"' "$PROJECT_ROOT/config/token-mapping-multichain.json" &>/dev/null; then
        log_ok "token-mapping-multichain.json: valid JSON with .pairs array"
      else
        log_err "token-mapping-multichain.json: invalid or missing .pairs array"
        ERRORS=$((ERRORS + 1))
      fi
    fi
  fi
  [[ -f "$PROJECT_ROOT/config/smart-contracts-master.json" ]] && log_ok "Found: config/smart-contracts-master.json" || true
  # Token lists (Uniswap format): validate structure if present
  for list in token-lists/lists/dbis-138.tokenlist.json token-lists/lists/cronos.tokenlist.json token-lists/lists/all-mainnet.tokenlist.json; do
    if [[ -f "$PROJECT_ROOT/$list" ]] && command -v jq &>/dev/null; then
      if jq -e '(.tokens | type == "array") and (.tokens | length > 0)' "$PROJECT_ROOT/$list" &>/dev/null; then
        log_ok "Token list valid: $list"
      else
        log_err "Token list invalid or empty: $list"
        ERRORS=$((ERRORS + 1))
      fi
    fi
  done
  # DUAL_CHAIN config (explorer deploy source)
  if [[ -f "$PROJECT_ROOT/explorer-monorepo/backend/api/rest/config/metamask/DUAL_CHAIN_TOKEN_LIST.tokenlist.json" ]] && command -v jq &>/dev/null; then
    if jq -e '(.tokens | type == "array") and (.tokens | length > 0)' "$PROJECT_ROOT/explorer-monorepo/backend/api/rest/config/metamask/DUAL_CHAIN_TOKEN_LIST.tokenlist.json" &>/dev/null; then
      log_ok "DUAL_CHAIN_TOKEN_LIST valid"
    else
      log_err "DUAL_CHAIN_TOKEN_LIST invalid or empty"
      ERRORS=$((ERRORS + 1))
    fi
  fi
fi

if [[ -n "$OPTIONAL_ENV" ]]; then
  for v in $OPTIONAL_ENV; do
    check_env "$v" || true
  done
fi

if [[ $ERRORS -gt 0 ]]; then
  log_err "Validation failed with $ERRORS error(s). Set VALIDATE_REQUIRED_FILES='path1 path2' to require specific files."
  exit 1
fi
log_ok "Validation passed."
exit 0