#!/usr/bin/env bash

# Determine which Docker image to run.
SQITCH_IMAGE=${SQITCH_IMAGE:=sqitch/sqitch:latest}

# Set up required pass-through variables.
user=${USER-$(whoami)}
passopt=(
    -e "SQITCH_ORIG_SYSUSER=$user"
    -e "SQITCH_ORIG_EMAIL=$user@$(hostname)"
    -e "TZ=$(date +%Z)" \
    -e "LESS=${LESS:--R}" \
)

# Handle OS-specific options.
case "$(uname -s)" in
    Linux*)
        passopt+=(-e "SQITCH_ORIG_FULLNAME=$(getent passwd $user | cut -d: -f5 | cut -d, -f1)")
        passopt+=(-u $(id -u ${user}):$(id -g ${user}))
        ;;
    Darwin*)
        passopt+=(-e "SQITCH_ORIG_FULLNAME=$(/usr/bin/id -P $user | awk -F '[:]' '{print $8}')")
        ;;
    MINGW*|CYGWIN*)
        passopt+=(-e "SQITCH_ORIG_FULLNAME=$(net user $user)")
        ;;
    *)
        echo "Unknown OS: $(uname -s)"
        exit 2
        ;;
esac

# Iterate over optional Sqitch and engine variables.
for var in \
    SQITCH_CONFIG SQITCH_USERNAME SQITCH_PASSWORD SQITCH_FULLNAME SQITCH_EMAIL SQITCH_TARGET \
    DBI_TRACE \
    PGUSER PGPASSWORD PGHOST PGHOSTADDR PGPORT PGDATABASE PGSERVICE PGOPTIONS PGSSLMODE PGREQUIRESSL PGSSLCOMPRESSION PGREQUIREPEER PGKRBSRVNAME PGKRBSRVNAME PGGSSLIB PGCONNECT_TIMEOUT PGCLIENTENCODING PGTARGETSESSIONATTRS \
    MYSQL_PWD MYSQL_HOST MYSQL_TCP_PORT \
    TNS_ADMIN TWO_TASK ORACLE_SID \
    ISC_USER ISC_PASSWORD \
    VSQL_HOST VSQL_PORT VSQL_USER VSQL_PASSWORD VSQL_SSLMODE \
    SNOWSQL_ACCOUNT SNOWSQL_USER SNOWSQL_PWD SNOWSQL_HOST SNOWSQL_PORT SNOWSQL_DATABASE SNOWSQL_REGION SNOWSQL_WAREHOUSE SNOWSQL_PRIVATE_KEY_PASSPHRASE SNOWSQL_ROLE
do
    if [ -n "${!var}" ]; then
       passopt+=(-e $var)
    fi
done

# Determine the name of the container home directory.
homedst=/home
if [ $(id -u ${user}) -eq 0 ]; then
    homedst=/root
fi
# Set HOME, since the user ID likely won't be the same as for the sqitch user.
passopt+=(-e "HOME=${homedst}")

# Determine necessary flags when stdin and/or stdout are opened on a TTY.
if [ -t 0 ] && [ -t 1 ]; then
    passopt+=(--interactive --tty)
elif [ ! -t 0 ]; then
    passopt+=(--interactive)
fi

# Run the container with the current and home directories mounted.
docker run --rm --network host \
    --mount "type=bind,src=$(pwd),dst=/repo" \
    --mount "type=bind,src=$HOME,dst=$homedst" \
    "${passopt[@]}" "$SQITCH_IMAGE" "$@"