#!/usr/bin/env bash

set -Eeuo pipefail

DEPLOY_ROOT="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd -P)"
cd "$DEPLOY_ROOT"

fail() {
	printf 'ERROR: %s\n' "$*" >&2
	exit 1
}

prompt_default() {
	local prompt="$1"
	local fallback="$2"
	local value

	printf '%s [%s]: ' "$prompt" "$fallback" >&2
	read -r value
	printf '%s' "${value:-$fallback}"
}

valid_hostname() {
	[[ "$1" =~ ^[A-Za-z0-9]([A-Za-z0-9.-]*[A-Za-z0-9])?$ &&
		"$1" != *..* ]]
}

valid_port() {
	[[ "$1" =~ ^[0-9]+$ ]] && (( 10#$1 >= 1 && 10#$1 <= 65535 ))
}

[[ $# -eq 0 ]] || fail "usage: ./install.sh"
[[ ! -e .env ]] ||
	fail ".env already exists; use ./manage.sh instead of overwriting this deployment"
for required_file in \
	compose.yaml \
	compose.http.yaml \
	compose.tls.yaml \
	deploy/nginx/templates/http.conf.template \
	deploy/nginx/templates/tls.conf.template; do
	[[ -f "$required_file" ]] ||
		fail "repository file is missing or not a regular file: ${required_file}"
done

for command_name in docker openssl; do
	command -v "$command_name" >/dev/null 2>&1 ||
		fail "$command_name is required"
done
docker compose version >/dev/null 2>&1 ||
	fail "Docker Compose v2 is required"
docker info >/dev/null 2>&1 ||
	fail "the Docker daemon is unavailable or this user cannot access it"

printf '\nTAPM Deployment Access installer\n'
printf 'This creates the initial environment and starts Gitea behind Nginx.\n'
printf 'The broker starts only after its Gitea OAuth and package credentials are configured.\n\n'

broker_domain="$(prompt_default 'Broker hostname' 'tapm.example.com')"
gitea_domain="$(prompt_default 'Gitea hostname' 'git.example.com')"
valid_hostname "$broker_domain" || fail "invalid broker hostname"
valid_hostname "$gitea_domain" || fail "invalid Gitea hostname"
[[ "$broker_domain" != "$gitea_domain" ]] ||
	fail "broker and Gitea hostnames must be different"

http_port="$(prompt_default 'VM port mapped to Nginx HTTP port 80' '8680')"
https_port="$(prompt_default 'VM port mapped to Nginx HTTPS port 443' '8643')"
valid_port "$http_port" || fail "invalid HTTP port"
valid_port "$https_port" || fail "invalid HTTPS port"
[[ "$http_port" != "$https_port" ]] || fail "HTTP and HTTPS ports must differ"

ssl_mode="$(prompt_default 'SSL mode (none, letsencrypt, or custom)' 'none')"
case "$ssl_mode" in
none)
	public_scheme=http
	public_port_suffix=":${http_port}"
	letsencrypt_email=''
	certificate_dir="./config/letsencrypt/live/${broker_domain}"
	;;
letsencrypt)
	public_scheme=https
	public_port_suffix=''
	printf 'Let'\''s Encrypt account email: '
	read -r letsencrypt_email
	[[ "$letsencrypt_email" == *@* ]] || fail "a valid email is required"
	certificate_dir="./config/letsencrypt/live/${broker_domain}"
	;;
custom)
	public_scheme=https
	public_port_suffix=''
	letsencrypt_email=''
	certificate_dir='./config/ssl'
	;;
*)
	fail "SSL mode must be none, letsencrypt, or custom"
	;;
esac

cookie_secret="$(openssl rand -base64 48)"
umask 077
{
	printf 'BROKER_DOMAIN=%s\n' "$broker_domain"
	printf 'GITEA_DOMAIN=%s\n' "$gitea_domain"
	printf 'GITEA_PUBLIC_URL=%s://%s%s/\n' "$public_scheme" "$gitea_domain" "$public_port_suffix"
	printf 'LETSENCRYPT_EMAIL=%s\n' "$letsencrypt_email"
	printf 'HTTP_PORT=%s\n' "$http_port"
	printf 'HTTPS_PORT=%s\n\n' "$https_port"
	printf 'BROKER_DIRECT_PORT=8080\n'
	printf 'GITEA_DIRECT_PORT=3000\n'
	printf 'GITEA_DIRECT_ROOT_URL=http://localhost:3000/\n\n'
	printf 'SSL_MODE=%s\n' "$ssl_mode"
	printf 'SSL_CERTIFICATE_DIR=%s\n' "$certificate_dir"
	printf 'SSL_CERTIFICATE_FILE=fullchain.pem\n'
	printf 'SSL_CERTIFICATE_KEY_FILE=privkey.pem\n\n'
	printf 'TAPM_DATABASE_DSN=file:/data/tapm.db?_pragma=busy_timeout(5000)&_pragma=foreign_keys(1)&_pragma=journal_mode(WAL)\n'
	printf 'TAPM_PUBLIC_URL=%s://%s%s\n' "$public_scheme" "$broker_domain" "$public_port_suffix"
	printf 'TAPM_GITEA_URL=%s://%s%s\n' "$public_scheme" "$gitea_domain" "$public_port_suffix"
	printf 'TAPM_GITEA_CLIENT_ID=\n'
	printf 'TAPM_GITEA_CLIENT_SECRET=\n'
	printf 'TAPM_GITEA_PACKAGE_OWNER=TAI\n'
	printf 'TAPM_GITEA_PACKAGE_USERNAME=\n'
	printf 'TAPM_GITEA_PACKAGE_TOKEN=\n'
	printf 'TAPM_GITEA_PACKAGE_WRITE_USERNAME=\n'
	printf 'TAPM_GITEA_PACKAGE_WRITE_TOKEN=\n'
	printf 'TAPM_ALLOWED_GITEA_USERS=taiadmin\n'
	printf 'TAPM_COOKIE_SECRET=%s\n' "$cookie_secret"
	printf 'TAPM_DEFAULT_DURATION=3h\n'
	printf 'TAPM_DEFAULT_HOST_LIMIT=3\n'
	printf 'TAPM_MAX_HOST_LIMIT=25\n'
	printf 'TAPM_MAX_UPLOAD_BYTES=1073741824\n'
	printf 'TAPM_TRUST_PROXY_HEADERS=true\n'
	printf 'TAPM_DISPLAY_TIME_ZONE=America/Chicago\n'
} >.env
chmod 600 .env

printf '\nInitial configuration saved to %s/.env.\n' "$DEPLOY_ROOT"
if [[ "$ssl_mode" == "custom" ]]; then
	printf 'Place the certificate and key in config/ssl, then run ./manage.sh bootstrap.\n'
	printf 'Gitea has not been started yet.\n'
	exit 0
fi
"${DEPLOY_ROOT}/manage.sh" bootstrap

printf '\nInitial Gitea deployment is running.\n'
printf 'Gitea URL: %s://%s%s\n' "$public_scheme" "$gitea_domain" "$public_port_suffix"
if [[ "$ssl_mode" == "none" ]]; then
	printf 'This is HTTP-only testing mode. Do not expose it publicly.\n'
	printf 'Make both hostnames resolve to this VM or its test-forwarding address.\n'
fi
printf '\nNext steps:\n'
printf '  1. Run ./manage.sh create-admin\n'
printf '  2. Sign in to Gitea and create the organization, package users/tokens,\n'
printf '     and OAuth application documented in docs/deployment.md.\n'
printf '  3. Run ./manage.sh configure-broker\n'
printf '  4. Run ./manage.sh start\n'
if [[ "$ssl_mode" == "none" ]]; then
	printf '  5. Later, after DNS and public 80/443 forwarding are ready, run:\n'
	printf '       ./manage.sh set-ssl letsencrypt\n'
	printf '       ./manage.sh bootstrap\n'
	printf '       ./manage.sh start\n'
fi