#!/bin/bash

set -e

# make sure a failure in any part of a pipe sequence is a failure
set -o pipefail

source "$(dirname "$0")/config.sh"
source "$(dirname "$0")/log.sh"
source "$(dirname "$0")/parallel.sh"

# check that we have all the variables we need
true "${CFE_BIN_DIR?undefined}"
true "${CFE_FR_SUPERHUB_DROP_DIR?undefined}"
true "${CFE_FR_SUPERHUB_IMPORT_DIR?undefined}"
true "${CFE_FR_COMPRESSOR_EXT?undefined}"
true "${CFE_FR_EXTRACTOR?undefined}"
true "${CFE_FR_TABLES?undefined}"
true "${CFE_FR_INVENTORY_REFRESH_CMD?undefined}"
true "${CFE_FR_HANDLE_DUPLICATES?undefined}"

if ! type "$CFE_FR_EXTRACTOR" >/dev/null; then
  log "Extractor $CFE_FR_EXTRACTOR not available!"
  exit 1
fi

# TODO: we should do some validation of the files here
mkdir -p "$CFE_FR_SUPERHUB_IMPORT_DIR"
no_drop_files=0
ls -l "$CFE_FR_SUPERHUB_DROP_DIR/"*".sql.$CFE_FR_COMPRESSOR_EXT" >/dev/null 2>/dev/null ||
  no_drop_files=1

if [ "$no_drop_files" != "0" ]; then
  log "No files in drop dir."
else
  log "Moving files from drop dir to import dir."
  mv "$CFE_FR_SUPERHUB_DROP_DIR/"*".sql.$CFE_FR_COMPRESSOR_EXT" "$CFE_FR_SUPERHUB_IMPORT_DIR" ||
    log "Failed to move files from drop dir to import dir."
fi

dump_files="$(ls -1 "$CFE_FR_SUPERHUB_IMPORT_DIR/"*".sql.$CFE_FR_COMPRESSOR_EXT" 2>/dev/null)" ||
  {
    log "No files to import."
    exit 0
  }

table_whitelist=$(printf "'%s'," $CFE_FR_TABLES | sed -e 's/,$//')

failed=0
log "Setting up schemas for import"
declare -a hostkeys
for file in $dump_files; do
  hostkey=$(basename "$file" | cut -d. -f1)
  hostkeys+=($hostkey)
  if [ -z $("$CFE_BIN_DIR"/psql --csv --tuples-only -U cfapache -d cfdb -c "SELECT hub_id FROM __hubs WHERE hostkey = '$hostkey';") ]; then
    log "No feeder with hostkey $hostkey found in cfdb.__hubs, skipping the dump file $file, consider deleting this file or re-adding the feeder to superhub"
    dump_files=$(echo "$dump_files" | sed "s,\s\?$file,," | xargs)
  else
    "$CFE_BIN_DIR"/psql -U $CFE_FR_DB_USER -d cfdb --set "ON_ERROR_STOP=1" \
                        -c "SELECT ensure_feeder_schema('$hostkey', ARRAY[$table_whitelist]);" \
      > schema_setup.log 2>&1 || failed=1
  fi
done
if [ "$failed" = "0" ]; then
  log "Setting up schemas for import: DONE"
else
  log "Setting up schemas for import: FAILED"
  # remove any newly created schemas (revert the changes)
  for file in $dump_files; do
    hostkey=$(basename "$file" | cut -d. -f1)
    "$CFE_BIN_DIR"/psql -U $CFE_FR_DB_USER -d cfdb -c "SELECT drop_feeder_schema('$hostkey');" || true
  done
  echo "last 10 lines of schema_setup.log"
  tail -n 10 schema_setup.log
  exit 1
fi

# if we removed all the dump_files due to lack of __hubs table entry, just quit
if [ -z "$dump_files" ]; then
  log "No dump files left to process."
  exit 0
fi
# make sure the script we are about to run is executable
chmod u+x "$(dirname "$0")/import_file.sh"

log "Importing files: $dump_files"
echo "$dump_files" | run_in_parallel "$(dirname "$0")/import_file.sh" - $CFE_FR_IMPORT_NJOBS ||
  failed=1
if [ "$failed" = "0" ]; then
  log "Importing files: DONE"
else
  log "Importing files: FAILED"
  for file in "$CFE_FR_SUPERHUB_IMPORT_DIR/"*".sql.$CFE_FR_COMPRESSOR_EXT.failed"; do
    log "Failed to import file '${file%%.failed}'"

    log "Last lines of failure log ${file%%.failed}.log.$CFE_FR_COMPRESSOR_EXT"
    "$CFE_FR_COMPRESSOR" $CFE_FR_DECOMPRESS_ARGS "${file%%.failed}.log.$CFE_FR_COMPRESSOR_EXT" | tail

    log "Revert changes by dropping $hostkey feeder schema"
    # (the original/in-use/previous schema is left intact)
    hostkey=$(basename "$file" | cut -d. -f1)
    "$CFE_BIN_DIR"/psql -U $CFE_FR_DB_USER -d cfdb -c "SELECT drop_feeder_schema('$hostkey');" || true
  done
fi

if [ "$CFE_FR_HANDLE_DUPLICATES" = "yes" ]; then
  log "Handle Duplicate Hostkeys"
  hostkey_list=$(printf "'%s'," ${hostkeys[*]} | sed -e 's/,$//')
  "$CFE_BIN_DIR"/psql -U $CFE_FR_DB_USER -d cfdb --set "ON_ERROR_STOP=1" \
                      -c "SELECT handle_duplicate_hostkeys_in_import(ARRAY[$hostkey_list]);"  \
    > duplicates.log 2>&1 || failed=1
  if [ "$failed" = "0" ]; then
    log "Handle Duplicate Hostkeys: DONE"
  else
    log "Handle Duplicate Hostkeys: FAILED"
    log "last 10 lines of duplicates.log"
    tail -n 10 duplicates.log
    exit 1
  fi
fi

failed=0
log "Attaching schemas"
for file in $dump_files; do
  if [ ! -f "${file}.failed" ]; then
    hostkey=$(basename "$file" | cut -d. -f1)
    "$CFE_BIN_DIR"/psql -U $CFE_FR_DB_USER -d cfdb --set "ON_ERROR_STOP=1" \
                        -c "SET SCHEMA 'public'; SELECT attach_feeder_schema('$hostkey', ARRAY[$table_whitelist]);" \
      > schema_attach.log 2>&1 || failed=1
  else
    rm -f "${file}.failed"
  fi
done
if [ "$failed" = "0" ]; then
  log "Attaching schemas: DONE"
else
  # attach_feeder_schema() makes sure the feeder's import schema is removed in
  # case of failure
  log "Attaching schemas: FAILED"
  log "last 10 lines of schema_attach.log"
  tail -n 10 schema_attach.log
  exit 1
fi

if [ -n "$CFE_FR_INVENTORY_REFRESH_CMD" ]; then
  log "Refreshing inventory"
  inv_refresh_failed=0
  $CFE_FR_INVENTORY_REFRESH_CMD || inv_refresh_failed=1
  if [ "$inv_refresh_failed" != "0" ]; then
    log "Refreshing inventory: FAILED"
    exit 1
  else
    log "Refreshing inventory: DONE"
  fi
fi