#!/bin/bash

# TODO
#   - PostgreSQL configuration file/env variable
#     (host, port, username, password, ..)

# usage:
#   `make create_database`
#      create a `taler-exchange` database
#   `make fetch_source`
#      fetch all *.sql and *.sql.in files from GNU Taler exchange repository (latest commit)
#      file `exchangedb.version` contains hash of latest commit that changed
#      something in exchange/src/exchangedb
#   `make init`
#      initialize taler-exchange database (create tables, ...)
#      `taler-exchange` database must already be created
#


set -e

taler_repo_url="https://git-www.taler.net/exchange.git/"

tmp_dir="/tmp/taler_exchange"
out_dir="./dbinit_sql"
out_init_sql="${out_dir}/init.sql"
out_init_drop="${out_dir}/drop.sql"

dbname="taler-exchange"

fetch() {
	git clone --depth 1 $taler_repo_url $tmp_dir
	#cp /tmp/exchange/src/exchangedb/*.sql $out_dir/
	#cp /tmp/exchange/src/exchangedb/*.sql.in $out_dir/
}

process() {
   source_dir="${tmp_dir}/src/exchangedb"
   sql_in_files=(
     "procedures.sql"
     "exchange-0002.sql"
     "exchange-0003.sql"
     "exchange-0004.sql"
   )
   for file in "${sql_in_files[@]}"; do
     echo "processing ${file}.in"
     file_in="${source_dir}/${file}.in"
     file_out="${source_dir}/${file}"
     gcc -E -P -undef - < "$file_in" \
       2>/dev/null \
       | sed -e "s/--.*//" \
       | awk 'NF' - \
       > "$file_out"
   done
   # order is important
   files=(
     "versioning.sql"
     "exchange-0001.sql"
     # "0001-*.sql"
     "exchange-0002.sql"
     "0002-*.sql"
     "exchange-0003.sql"
     "0003-*.sql"
     "exchange-0004.sql"
     "0004-*.sql"
     "exchange-0005.sql"
     # "0005-*.sql"
     "procedures.sql"
     "exchange_do_*.sql"
     "exchange_statistics_*.sql"
     "exchange_trigger_*.sql"
   )
   mkdir -p "$out_dir"
   echo "" > $out_init_sql
   for file in ${files[@]}; do
      # '*'-expension
         echo "append ${source_dir}$file"
         wc -l ${source_dir}${file}
         cat ${source_dir}${file} >> "$out_init_sql"
   done
}

if [[ $# -eq 0 ]]; then
    echo "no arguments" >&2
    exit 1
fi

cmd=$1
case "$cmd" in
    fetch)    fetch "$@"; exit 0;;
    process)  process "$@"; exit 0;;
    *)        echo "Unknown command: $cmd" >&2; exit 1;;
esac

#clean:
#	rm -f procedures.sql
#	rm -f exchange-0002.sql
#	rm -f exchange-0003.sql
#	rm -f exchange-0004.sql
#	rm $(sql_INIT)
#
## "NOTICE:  function xxx() does not exist, skipping" are normal and expected
#init: gen_init
#	psql --host=localhost --port=5432 --username=mte --password --dbname=$(dbname) --file=$(sql_INIT)
#
#drop:
#	psql --host=localhost --port=5432 --username=mte --password --dbname=$(dbname) --file=$(sql_DROP)
#
#create_database:
#	createdb --host=localhost --port=5432 --username=mte --password $(dbname)
#
#drop_database:
#	dropdb --host=localhost --port=5432 --username=mte --password $(dbname)
#
#reset_database: drop_database create_database
#