#!/usr/bin/env bash
#  vim:ts=4:sts=4:sw=4:et
#  shellcheck disable=SC2028
#
#  Author: Hari Sekhon
#  Date: 2020-08-09 10:42:23 +0100 (Sun, 09 Aug 2020)
#
#  https://github.com/harisekhon/bash-tools
#
#  License: see accompanying Hari Sekhon LICENSE file
#
#  If you're using my code you're welcome to connect with me on LinkedIn and optionally send me feedback to help steer this or other code I publish
#
#  https://www.linkedin.com/in/harisekhon
#

set -euo pipefail
[ -n "${DEBUG:-}" ] && set -x
srcdir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

# shellcheck disable=SC1090
. "$srcdir/lib/utils.sh"

postgres_versions="
8.4
9.0
9.1
9.2
9.3
9.4
9.5
9.6
10.0
10.1
10.2
10.3
10.4
10.5
10.6
10.7
10.8
10.9
11.0
11.1
11.2
11.3
11.4
11.5
11.6
11.7
11.8
12.0
12.1
12.2
12.3
latest
"

# shellcheck disable=SC2034,SC2154
usage_description="
Runs all of the scripts given as arguments against multiple PostgreSQL versions using docker

Uses postgres.sh to boot a PostgreSQL docker environment and pipe source statements in to the container

Sources each script in PostgreSQL in the order given

Runs against a list of PostgreSQL versions from the first of the following conditions:

- If \$POSTGRES_VERSIONS environment variable is set, then only tests against those versions in the order given
- If \$GET_DOCKER_TAGS is set and dockerhub_show_tags.py is found in the \$PATH (from DevOps Python tools repo), then uses it to fetch the latest live list of version tags available from the dockerhub API, reordering by newest first
- Falls back to the following pre-set list of versions, reordering by newest first:

$(tr ' ' '\n' <<< "$postgres_versions" | grep -v '^[[:space:]]*$')
"

# used by usage() in lib/utils.sh
# shellcheck disable=SC2034
usage_args="script1.sql [script2.sql ...]"

help_usage "$@"

min_args 1 "$@"

for sql in "$@"; do
    [ -f "$sql" ] || die "ERROR: file not found: $sql"
done

get_postgres_versions(){
    if [ -n "${GET_DOCKER_TAGS:-}" ]; then
        echo "checking if dockerhub_show_tags.py is available:" >&2
        echo
        if type -P dockerhub_show_tags.py 2>/dev/null; then
            echo
            echo "dockerhub_show_tags.py found, executing to get latest list of PostgreSQL docker version tags" >&2
            echo
            postgres_versions="$(dockerhub_show_tags.py postgres |
                                grep -Eo '[[:space:]][[:digit:]]{1,2}\.[[:digit:]]' -e '^[[:space:]*latest[[:space:]]*$' |
                                sed 's/[[:space:]]//g' |
                                grep -v "8.4" |
                                sort -u -t. -k1n -k2n)"
            echo "found PostgreSQL versions:" >&2
            echo "$postgres_versions"
            return
        fi
    fi
    echo "using default list of PostgreSQL versions to test against:" >&2
    echo "$postgres_versions"
}

if [ -n "${POSTGRES_VERSIONS:-}" ]; then
    postgres_versions="${POSTGRES_VERSIONS//,/ }"
    echo "using given PostgreSQL versions:" >&2
else
    postgres_versions="$(get_postgres_versions | tail -r)"
fi

tr ' ' '\n' <<< "$postgres_versions"
echo

for version in $postgres_versions; do
    hr
    echo "Executing scripts against PostgreSQL version '$version'": >&2
    echo >&2
    {
    echo 'SELECT VERSION();'
    for sql in "$@"; do
        echo '\! printf "================================================================================\n"'
        # no effect
        #echo
        echo '\set ON_ERROR_STOP true'
        # ugly
        #echo "select '$sql' as script;"
        echo "\\! printf '\\nscript %s:\\n\\n' '$sql'"
        # instead of dealing with pathing issues, prefixing /pwd or depending on the scripts being in the sql/ directory
        #echo "\\i $sql"
        cat "$sql"
        echo "\\! printf '\\n\\n'"
    done
    } |
    # need docker run non-interactive to avoid tty errors
    DOCKER_NON_INTERACTIVE=1 \
    "$srcdir/postgres.sh" "$version"
    echo
    echo
done