#!/bin/sh

# Script to initialize a taler-exchange database.
# To use as an alternative to the taler-exchange-dbinit tool.
#
# This script aggregate GNU Taler exchange's SQL files together,
# and send commands to PostgreSQL server with `psql`.


# Usage:
#   `fetch`
#      fetch all *.sql and *.sql.in files from GNU Taler exchange repository
#   `build`
#      merge *.sql and *.sql.in files to produce `init.sql` and `drop.sql`
#   `database_init`
#      create a `taler-exchange` database
#   `database_drop`
#      drop `taler-exchange` database
#   `init`
#      apply `init.sql`
#      (database must already be created)
#   `drop`
#      apply `drop.sql`

set -e

taler_repo_url="https://git-www.taler.net/exchange.git/"
# todo
# update to use taler exchange new build system and better *.sql organization
taler_repo_tag="v1.5.0"

tmp_dir="/tmp/taler_exchange"
out_dir="./_dbinit_sql"
init_sql="${out_dir}/init.sql"
drop_sql="${out_dir}/drop.sql"

# psql parameter
host="10.0.0.1"
port=5432
username="mte"
dbname="taler-exchange"

fetch() {
   git clone --depth 1 --branch $taler_repo_tag $taler_repo_url $tmp_dir
}

build() {
   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
     file_in="${source_dir}/${file}.in"
     file_out="${source_dir}/${file}"
     gcc -E -P -undef -I "$source_dir" - < "$file_in" \
       2>/dev/null \
       > "$file_out"
   done
   # order is important
   files=(
     "versioning.sql"
     "exchange-0001.sql"
     "exchange-0002.sql"
     "exchange-0003.sql"
     "exchange-0004.sql"
     "exchange-0005.sql"
     "procedures.sql"
   )
   mkdir -p "$out_dir"
   cat "${source_dir}/drop.sql" > "$drop_sql"
   echo "" > "$init_sql"
   for file in "${files[@]}"; do
      cat "${source_dir}/${file}" >> "$init_sql"
   done
}

database_init() {
   createdb --host=$host --port=$port --username=$username --password $dbname
}

database_drop() {
   dropdb --host=$host --port=$port --username=$username --password $dbname
}

init() {
   psql --host=$host --port=$port --username=$username --password --dbname=$dbname --file=$init_sql
}

drop() {
   psql --host=$host --port=$port --username=$username --password --dbname=$dbname --file=$drop_sql
}

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

cmd=$1
case "$cmd" in
    fetch) fetch "$@"; exit 0;;
    build) build "$@"; exit 0;;
    database_init) database_init "$@"; exit 0;;
    database_drop) database_drop "$@"; exit 0;;
    init) init "$@"; exit 0;;
    drop) drop "$@"; exit 0;;
    *) echo "Unknown command: $cmd" >&2; exit 1;;
esac