#!/usr/bin/env bash

# Copyright (c) 2023 Cisco and/or its affiliates.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

set -exuo pipefail


function terraform_apply () {

    # Run terraform apply command to prepare topology.
    #
    # Variable read:
    # - ${CSIT_DIR} - CSIT main directory, where terraform modules are located.
    # - ${TERRAFORM_MODULE_DIR} - Terraform module directory.

    set -exuo pipefail

    if ! installed terraform; then
        die "Please install terraform!"
    fi

    pushd "${CSIT_DIR}"/fdio.infra.terraform || die "Pushd failed!"
    pushd "${TERRAFORM_MODULE_DIR}" || die "Pushd failed!"
    export TF_LOG=INFO
    terraform apply -no-color -auto-approve  || die "Terraform apply failed!"
    popd || die "Popd failed!"
    popd || die "Popd failed!"
}


function terraform_destroy () {

    # Run terraform destroy command to prepare module.
    #
    # Variable read:
    # - ${CSIT_DIR} - CSIT main directory, where terraform modules are located.
    # - ${TERRAFORM_MODULE_DIR} - Terraform module directory.

    set -exuo pipefail

    if ! installed terraform; then
        die "Please install terraform!"
    fi

    pushd "${CSIT_DIR}"/fdio.infra.terraform || die "Pushd failed!"
    pushd "${TERRAFORM_MODULE_DIR}" || die "Pushd failed!"
    export TF_LOG=INFO
    terraform destroy -auto-approve -no-color || die "Terraform destroy failed!"
    popd || die "Popd failed!"
    popd || die "Popd failed!"
}


function terraform_init () {

    # Run terraform init command to prepare module.
    #
    # Variable read:
    # - ${CSIT_DIR} - CSIT main directory, where terraform modules are located.
    # - ${TERRAFORM_MODULE_DIR} - Terraform module directory.

    set -exuo pipefail

    if ! installed terraform; then
        die "Please install terraform!"
    fi

    pushd "${CSIT_DIR}"/fdio.infra.terraform || die "Pushd failed!"
    pushd "${TERRAFORM_MODULE_DIR}" || die "Pushd failed!"

    plugin_url="https://github.com/radekg/terraform-provisioner-ansible/"
    plugin_url+="releases/download/v2.5.0/"
    plugin_url+="terraform-provisioner-ansible-linux-amd64_v2.5.0"
    plugin_dir="${HOME}/.terraform.d/plugins/"
    plugin_path+="${plugin_dir}terraform-provisioner-ansible_v2.5.0"

    mkdir -p "${plugin_dir}" || die "Failed to create dir!"
    wget -O "${plugin_path}" "${plugin_url}" || die "Failed to download plugin!"
    chmod +x "${plugin_path}" || die "Failed to add execute rights!"

    rm -f terraform.tfstate || die "Failed to clear terraform state!"
    export TF_LOG=INFO
    terraform init || die "Failed to run terraform init!"
    popd || die "Popd failed!"
    popd || die "Popd failed!"
}


function terraform_install () {

    # Install terraform.

    terraform_version="1.4.2/terraform_1.4.2_linux_arm64.zip"
    terraform_url="https://releases.hashicorp.com/terraform"
    terraform_link="${terraform_url}/${terraform_version}"
    wget "${terraform_link}" || die "Failed to install Terraform!"
    unzip "terraform_1.4.2_linux_arm64.zip" || die "Failed to install Terraform!"
    mv "terraform" "/usr/local/bin" || die "Failed to install Terraform!"
    rm "terraform_1.4.2_linux_arm64.zip" || die "Failed to install Terraform!"
}


function terraform_output () {

    # Run terraform output command to prepare module.
    #
    # Variable read:
    # - ${CSIT_DIR} - CSIT main directory, where terraform modules are located.
    # - ${TERRAFORM_MODULE_DIR} - Terraform module directory.
    # - ${TERRAFORM_OUTPUT_VAR} - Terraform variable to export.

    set -exuo pipefail

    if ! installed terraform; then
        die "Please install terraform!"
    fi

    pushd "${CSIT_DIR}"/fdio.infra.terraform || die "Pushd failed!"
    pushd "${TERRAFORM_MODULE_DIR}" || die "Pushd failed!"
    TERRAFORM_OUTPUT_VAL=$(terraform output --raw "${TERRAFORM_OUTPUT_VAR}")
    popd || die "Popd failed!"
    popd || die "Popd failed!"
}


function terraform_validate () {

    # Run terraform validate command to prepare module.
    #
    # Variable read:
    # - ${CSIT_DIR} - CSIT main directory, where terraform modules are located.
    # - ${TERRAFORM_MODULE_DIR} - Terraform module directory.

    set -exuo pipefail

    if ! installed terraform; then
        die "Please install terraform!"
    fi

    pushd "${CSIT_DIR}"/fdio.infra.terraform || die "Pushd failed!"
    pushd "${TERRAFORM_MODULE_DIR}" || die "Pushd failed!"
    export TF_LOG=INFO
    terraform validate || die "Terraform validate failed!"
    popd || die "Popd failed!"
    popd || die "Popd failed!"
}


function installed () {

    # Check if the given utility is installed. Fail if not installed.
    #
    # Arguments:
    # - ${1} - Utility to check.
    # Returns (implicitly):
    # - 0 - If command is installed.
    # - 1 - If command is not installed.

    set -exuo pipefail

    command -v "${1}"
}