#!/bin/bash
set -euo pipefail

# Colors for output
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
BLUE='\033[0;34m'
NC='\033[0m' # No Color

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
LIB_PATH="$SCRIPT_DIR/lib/setup_common.sh"
BOOTSTRAP_LIB=""

if [[ ! -f "$LIB_PATH" ]]; then
    BOOTSTRAP_LIB="$(mktemp)"
    curl -fsSL -o "$BOOTSTRAP_LIB" "https://raw.githubusercontent.com/dograh-hq/dograh/main/scripts/lib/setup_common.sh"
    LIB_PATH="$BOOTSTRAP_LIB"
fi

cleanup() {
    if [[ -n "$BOOTSTRAP_LIB" ]]; then
        rm -f "$BOOTSTRAP_LIB"
    fi
}
trap cleanup EXIT

# shellcheck disable=SC1090
. "$LIB_PATH"

echo -e "${BLUE}"
echo "╔══════════════════════════════════════════════════════════════╗"
echo "║                   Dograh Remote Setup                        ║"
echo "║      Automated HTTPS deployment with TURN server             ║"
echo "╚══════════════════════════════════════════════════════════════╝"
echo -e "${NC}"

# This setup must run as root: it provisions Docker, binds privileged ports
# 80/443, and (for public IPs) installs a Let's Encrypt certificate plus a
# system renewal hook under /etc/letsencrypt — all of which require root. Stop
# early with clear guidance rather than getting halfway and degrading the install.
if [[ $EUID -ne 0 ]]; then
    dograh_fail "setup_remote.sh must be run as root.\nRe-run with sudo:\n  sudo ./setup_remote.sh"
fi

# Get the server IP address (skip prompt if SERVER_IP is already set)
if [[ -z "${SERVER_IP:-}" ]]; then
    echo -e "${YELLOW}Enter your server's IP address:${NC}"
    read -p "> " SERVER_IP
fi

if [[ -z "$SERVER_IP" ]]; then
    dograh_fail "IP address cannot be empty"
fi

if ! dograh_is_ipv4 "$SERVER_IP"; then
    dograh_fail "Invalid IP address format"
fi

# Certificate strategy. CERT_MODE selects how HTTPS is secured:
#   auto        - public IP + root + docker -> sslip (trusted); otherwise self-signed
#   sslip       - free trusted Let's Encrypt cert via <ip>.sslip.io (public IP only)
#   self-signed - generate a self-signed cert (browser shows a warning)
# Reserved for future private-network paths (not implemented yet):
#   letsencrypt-dns, cloudflare-tunnel, external
CERT_MODE="${CERT_MODE:-auto}"
ACME_DOMAIN_SUFFIX="${ACME_DOMAIN_SUFFIX:-sslip.io}"
LETSENCRYPT_EMAIL="${LETSENCRYPT_EMAIL:-}"

if [[ "$CERT_MODE" == "auto" ]]; then
    if dograh_is_local_ipv4 "$SERVER_IP"; then
        CERT_MODE="self-signed"
        dograh_warn "$SERVER_IP is a private IP — using a self-signed certificate."
        dograh_warn "For a trusted cert, deploy on a public IP or a domain you own"
        dograh_warn "(https://docs.dograh.com/deployment/custom-domain)."
    elif ! command -v docker >/dev/null 2>&1; then
        CERT_MODE="self-signed"
        dograh_warn "Docker not found — skipping automatic Let's Encrypt setup and using a self-signed cert."
    else
        CERT_MODE="sslip"
    fi
fi

case "$CERT_MODE" in
    self-signed) ;;
    sslip)
        if dograh_is_local_ipv4 "$SERVER_IP"; then
            dograh_fail "CERT_MODE=sslip needs a public IP; $SERVER_IP is private/reserved."
        fi
        command -v docker >/dev/null 2>&1 || dograh_fail "CERT_MODE=sslip needs Docker to serve the ACME challenge."
        ;;
    letsencrypt-dns|cloudflare-tunnel|external)
        dograh_fail "CERT_MODE=$CERT_MODE is reserved but not implemented yet. Use 'sslip' (public IP) or 'self-signed'."
        ;;
    *)
        dograh_fail "Unknown CERT_MODE '$CERT_MODE' (expected: auto, sslip, self-signed)."
        ;;
esac

if [[ "$CERT_MODE" == "sslip" ]]; then
    PUBLIC_HOST_VALUE="$(dograh_sslip_host_from_ip "$SERVER_IP" "$ACME_DOMAIN_SUFFIX")"
    CERT_DESC="Let's Encrypt via $ACME_DOMAIN_SUFFIX (trusted)"
else
    PUBLIC_HOST_VALUE="$SERVER_IP"
    CERT_DESC="self-signed (browser warning)"
fi
CERT_RESULT="$CERT_MODE"

if [[ "$CERT_MODE" == "sslip" && -z "$LETSENCRYPT_EMAIL" && -t 0 ]]; then
    echo ""
    echo -e "${YELLOW}Email for Let's Encrypt expiry notices (optional, press Enter to skip):${NC}"
    read -p "> " LETSENCRYPT_EMAIL
fi

FORCE_TURN_RELAY="${FORCE_TURN_RELAY:-false}"

# Get the TURN secret (skip prompt if TURN_SECRET is already set)
if [[ -z "${TURN_SECRET:-}" ]]; then
    echo -e "${YELLOW}Enter a shared secret for the TURN server (press Enter to generate a random one):${NC}"
    read -sp "> " TURN_SECRET
    echo ""
fi

if [[ -z "$TURN_SECRET" ]]; then
    TURN_SECRET=$(openssl rand -hex 32)
    echo -e "${BLUE}Generated random TURN secret${NC}"
fi

# Deployment mode. Skip prompt if DEPLOY_MODE is already set. Non-interactive
# callers without a TTY default to "prebuilt" to keep automation stable.
if [[ -z "${DEPLOY_MODE:-}" ]]; then
    if [[ -t 0 ]]; then
        echo ""
        echo -e "${YELLOW}Deployment mode:${NC}"
        echo "  1) prebuilt - pull official dograh images (recommended, fastest)"
        echo "  2) build    - build images from source (for forks or local customizations)"
        read -p "Choose [1]: " mode_choice
        mode_choice="${mode_choice:-1}"
        case "$mode_choice" in
            1|prebuilt) DEPLOY_MODE="prebuilt" ;;
            2|build) DEPLOY_MODE="build" ;;
            *) dograh_fail "invalid choice '$mode_choice'" ;;
        esac
    else
        DEPLOY_MODE="prebuilt"
    fi
fi

if [[ "$DEPLOY_MODE" == "build" ]]; then
    if [[ -z "${REPO_SOURCE:-}" ]]; then
        if [[ -d ".git" ]] && [[ -f "docker-compose.yaml" ]]; then
            if [[ -t 0 ]]; then
                echo ""
                echo -e "${YELLOW}Detected a git repo with docker-compose.yaml in $(pwd).${NC}"
                read -p "Build from this repo? [Y/n]: " use_existing
                use_existing="${use_existing:-Y}"
                if [[ "$use_existing" =~ ^[Yy] ]]; then
                    REPO_SOURCE="existing"
                else
                    REPO_SOURCE="clone"
                fi
            else
                REPO_SOURCE="existing"
            fi
        else
            REPO_SOURCE="clone"
        fi
    fi

    if [[ "$REPO_SOURCE" == "clone" ]]; then
        if [[ -z "${FORK_REPO:-}" ]]; then
            if [[ -t 0 ]]; then
                echo ""
                echo -e "${YELLOW}GitHub repo to clone (format: owner/name):${NC}"
                read -p "[dograh-hq/dograh]: " FORK_REPO
                FORK_REPO="${FORK_REPO:-dograh-hq/dograh}"
            else
                FORK_REPO="dograh-hq/dograh"
            fi
        fi

        if [[ -z "${BRANCH:-}" ]]; then
            if [[ -t 0 ]]; then
                echo -e "${YELLOW}Branch:${NC}"
                read -p "[main]: " BRANCH
                BRANCH="${BRANCH:-main}"
            else
                BRANCH="main"
            fi
        fi
    fi
fi

ENABLE_TELEMETRY="${ENABLE_TELEMETRY:-true}"
FASTAPI_WORKERS="${FASTAPI_WORKERS:-}"

if [[ -z "$FASTAPI_WORKERS" ]]; then
    if [[ -t 0 ]]; then
        echo ""
        echo -e "${YELLOW}Number of FastAPI workers (uvicorn processes nginx will load-balance):${NC}"
        read -p "[2]: " FASTAPI_WORKERS
        FASTAPI_WORKERS="${FASTAPI_WORKERS:-2}"
    else
        FASTAPI_WORKERS="2"
    fi
fi

[[ "$FASTAPI_WORKERS" =~ ^[1-9][0-9]*$ ]] || dograh_fail "FASTAPI_WORKERS must be a positive integer (got: $FASTAPI_WORKERS)"

if [[ "$DEPLOY_MODE" == "build" && "${REPO_SOURCE:-}" == "existing" ]]; then
    TARGET_DIR="."
else
    TARGET_DIR="dograh"
fi

if [[ "${DOGRAH_FORCE_OVERWRITE:-}" != "1" && "${DOGRAH_SKIP_DOWNLOAD:-}" != "1" ]]; then
    if [[ -f "$TARGET_DIR/.env" ]]; then
        if [[ "$TARGET_DIR" == "." ]]; then
            existing_path="$(pwd)/.env"
        else
            existing_path="$(pwd)/$TARGET_DIR/.env"
        fi
        echo ""
        echo -e "${YELLOW}Detected an existing Dograh install:${NC}"
        echo -e "  ${YELLOW}$existing_path${NC}"
        echo ""
        echo -e "${RED}Refusing to continue - re-running setup would:${NC}"
        echo -e "${RED}  - overwrite .env (invalidates sessions, breaks TURN auth)${NC}"
        echo -e "${RED}  - regenerate SSL certificates${NC}"
        echo -e "${RED}  - replace the validated remote deployment bundle${NC}"
        echo ""
        echo -e "${BLUE}To upgrade an existing install, follow:${NC}"
        echo -e "  ${BLUE}https://docs.dograh.com/deployment/update${NC}"
        echo ""
        echo -e "${BLUE}To wipe state and reinstall from scratch, re-run with:${NC}"
        echo -e "  ${BLUE}DOGRAH_FORCE_OVERWRITE=1 <same command>${NC}"
        echo ""
        exit 1
    fi
fi

if [[ "$DEPLOY_MODE" == "build" ]]; then
    TOTAL=6
else
    TOTAL=5
fi

echo ""
echo -e "${GREEN}Configuration:${NC}"
echo -e "  Server IP:        ${BLUE}$SERVER_IP${NC}"
echo -e "  Public host:      ${BLUE}$PUBLIC_HOST_VALUE${NC}"
echo -e "  Certificate:      ${BLUE}$CERT_DESC${NC}"
echo -e "  TURN Secret:      ${BLUE}********${NC}"
echo -e "  Deploy mode:      ${BLUE}$DEPLOY_MODE${NC}"
echo -e "  Force TURN relay: ${BLUE}$FORCE_TURN_RELAY${NC}"
echo -e "  FastAPI workers:  ${BLUE}$FASTAPI_WORKERS${NC}  (ports 8000..$((8000 + FASTAPI_WORKERS - 1)))"
if [[ "$DEPLOY_MODE" == "build" ]]; then
    if [[ "${REPO_SOURCE:-}" == "clone" ]]; then
        echo -e "  Source:           ${BLUE}clone $FORK_REPO@$BRANCH${NC}"
    else
        echo -e "  Source:           ${BLUE}existing repo at $(pwd)${NC}"
    fi
fi
echo ""

if [[ "$DEPLOY_MODE" == "build" ]]; then
    if [[ "${DOGRAH_SKIP_DOWNLOAD:-}" == "1" ]]; then
        echo -e "${BLUE}[1/$TOTAL] Using existing repo in current directory${NC}"
    elif [[ "${REPO_SOURCE:-}" == "clone" ]]; then
        if [[ -e "dograh" ]]; then
            dograh_fail "'dograh' directory already exists. Remove it or re-run with REPO_SOURCE=existing from inside it."
        fi
        echo -e "${BLUE}[1/$TOTAL] Cloning $FORK_REPO (branch: $BRANCH)...${NC}"
        git clone --branch "$BRANCH" --recurse-submodules "https://github.com/$FORK_REPO.git" dograh
        cd dograh
        echo -e "${GREEN}✓ Repo cloned${NC}"
    else
        echo -e "${BLUE}[1/$TOTAL] Using existing repo at $(pwd)${NC}"
    fi
else
    if [[ "${DOGRAH_SKIP_DOWNLOAD:-}" != "1" ]]; then
        mkdir -p dograh 2>/dev/null || true
        cd dograh

        echo -e "${BLUE}[1/$TOTAL] Downloading deployment bundle...${NC}"
        curl -fsSL -o docker-compose.yaml "https://raw.githubusercontent.com/dograh-hq/dograh/main/docker-compose.yaml"
        dograh_download_remote_support_bundle "$(pwd)" "main"
        echo -e "${GREEN}✓ Deployment bundle downloaded${NC}"
    else
        echo -e "${BLUE}[1/$TOTAL] Using deployment files in current directory${NC}"
    fi
fi

DOGRAH_DEPLOY_PROJECT_DIR="$(pwd)"

if [[ "$DEPLOY_MODE" != "prebuilt" ]]; then
    chmod +x remote_up.sh
fi

echo -e "${BLUE}[2/$TOTAL] Creating SSL certificate generation script...${NC}"
cat > generate_certificate.sh << CERT_EOF
#!/bin/bash
mkdir -p certs
openssl req -x509 -nodes -newkey rsa:2048 \\
  -keyout certs/local.key \\
  -out certs/local.crt \\
  -days 365 \\
  -subj "/CN=$PUBLIC_HOST_VALUE"
CERT_EOF
chmod +x generate_certificate.sh
echo -e "${GREEN}✓ generate_certificate.sh created${NC}"

echo -e "${BLUE}[3/$TOTAL] Generating SSL certificates...${NC}"
./generate_certificate.sh
echo -e "${GREEN}✓ SSL certificates generated${NC}"

echo -e "${BLUE}[4/$TOTAL] Creating environment file...${NC}"
OSS_JWT_SECRET=$(openssl rand -hex 32)
POSTGRES_PASSWORD=$(openssl rand -hex 32)
REDIS_PASSWORD=$(openssl rand -hex 32)
MINIO_ROOT_USER="dograh$(openssl rand -hex 6)"
MINIO_ROOT_PASSWORD=$(openssl rand -hex 32)

cat > .env << ENV_EOF
# Remote deployments run with production signaling and HTTPS defaults
ENVIRONMENT=production

# Canonical public host/base URL for this install. SERVER_IP stays the raw IP
# (coturn external-ip and validation need it); PUBLIC_HOST is the sslip.io
# hostname when using a trusted cert, otherwise the IP. BACKEND_API_ENDPOINT,
# MINIO_PUBLIC_ENDPOINT and TURN_HOST are derived from these by the API
# (see api/constants.py) — set them here only to override for a split deployment.
SERVER_IP=$SERVER_IP
PUBLIC_HOST=$PUBLIC_HOST_VALUE
PUBLIC_BASE_URL=https://$PUBLIC_HOST_VALUE

# TURN Server Configuration (time-limited credentials via TURN REST API)
TURN_SECRET=$TURN_SECRET
# Relay-only ICE candidates for explicit TURN diagnostics
FORCE_TURN_RELAY=$FORCE_TURN_RELAY

# JWT secret for OSS authentication
OSS_JWT_SECRET=$OSS_JWT_SECRET

# PostgreSQL password. Used by the postgres container on first init and by the
# API's DATABASE_URL. Do not change after the first start — the password is
# baked into the postgres data volume when it is first created.
POSTGRES_PASSWORD=$POSTGRES_PASSWORD

# Redis password. Used by the redis container's --requirepass and the API's
# REDIS_URL. Unlike postgres, this is not baked into a volume and can be
# rotated by updating .env and recreating the redis container.
REDIS_PASSWORD=$REDIS_PASSWORD

# MinIO root credentials. Used by the MinIO container and the API's
# MINIO_ACCESS_KEY / MINIO_SECRET_KEY.
MINIO_ROOT_USER=$MINIO_ROOT_USER
MINIO_ROOT_PASSWORD=$MINIO_ROOT_PASSWORD

# Telemetry (set to false to disable)
ENABLE_TELEMETRY=$ENABLE_TELEMETRY

# Number of uvicorn worker processes; nginx load-balances across them
FASTAPI_WORKERS=$FASTAPI_WORKERS
ENV_EOF
echo -e "${GREEN}✓ .env file created${NC}"

echo -e "${BLUE}[5/$TOTAL] Validating remote init configuration...${NC}"
dograh_prepare_remote_install "$(pwd)"
echo -e "${GREEN}✓ Remote init configuration validated${NC}"

if [[ "$DEPLOY_MODE" == "build" ]]; then
    echo -e "${BLUE}[6/$TOTAL] Creating docker-compose.override.yaml...${NC}"
    cat > docker-compose.override.yaml << 'OVERRIDE_EOF'
# Auto-generated by setup_remote.sh (build mode).
# Overrides docker-compose.yaml to build api and ui images from local source
# instead of pulling them from a registry. Remove this file to revert to
# pulling prebuilt images.
services:
  api:
    build:
      context: .
      dockerfile: api/Dockerfile
    image: dograh-local/dograh-api:local
    pull_policy: never

  ui:
    build:
      context: .
      dockerfile: ui/Dockerfile
    image: dograh-local/dograh-ui:local
    pull_policy: never
OVERRIDE_EOF
    echo -e "${GREEN}✓ docker-compose.override.yaml created${NC}"
fi

if [[ "$CERT_MODE" == "sslip" ]]; then
    echo ""
    echo -e "${BLUE}Starting Dograh and requesting a trusted certificate for ${PUBLIC_HOST_VALUE}...${NC}"

    if [[ "$DEPLOY_MODE" == "build" ]]; then
        ./remote_up.sh --build
    else
        ./remote_up.sh
    fi

    echo -e "${BLUE}Waiting for nginx to answer on port 80...${NC}"
    nginx_ready=0
    for ((i=1; i<=60; i++)); do
        if curl -s -o /dev/null --max-time 3 "http://127.0.0.1/"; then
            nginx_ready=1
            break
        fi
        sleep 2
    done

    if [[ "$nginx_ready" != "1" ]]; then
        CERT_RESULT="self-signed"
        dograh_warn "nginx did not become reachable on port 80 — skipping Let's Encrypt for now."
        dograh_warn "The stack is running with the bootstrap self-signed certificate."
    elif dograh_install_certbot && dograh_issue_letsencrypt_webroot "$(pwd)" "$PUBLIC_HOST_VALUE" "$LETSENCRYPT_EMAIL"; then
        docker compose --profile remote restart nginx >/dev/null 2>&1 || true
        dograh_install_cert_renewal_hook "$(pwd)" "$PUBLIC_HOST_VALUE"
        CERT_RESULT="sslip"
        dograh_success "✓ Trusted Let's Encrypt certificate installed; auto-renewal configured"
    else
        CERT_RESULT="self-signed"
        echo ""
        dograh_warn "Let's Encrypt issuance failed — the stack is running with the self-signed certificate."
        dograh_warn "Common causes and fixes:"
        dograh_warn "  - Port 80 not reachable from the internet: open it in your firewall/security group"
        dograh_warn "  - Rate limited on ${ACME_DOMAIN_SUFFIX}: re-run with ACME_DOMAIN_SUFFIX=nip.io"
        dograh_warn "  - Then retry: sudo certbot certonly --webroot -w \"$(pwd)/certs\" -d ${PUBLIC_HOST_VALUE}"
    fi
fi

echo ""
echo -e "${GREEN}╔══════════════════════════════════════════════════════════════╗${NC}"
echo -e "${GREEN}║                    Setup Complete!                           ║${NC}"
echo -e "${GREEN}╚══════════════════════════════════════════════════════════════╝${NC}"
echo ""
echo -e "Files created in ${BLUE}$(pwd)${NC}:"
echo "  - docker-compose.yaml"
if [[ "$DEPLOY_MODE" == "build" ]]; then
    echo "  - docker-compose.override.yaml  (build directives)"
fi
echo "  - remote_up.sh"
echo "  - scripts/run_dograh_init.sh"
echo "  - deploy/templates/"
echo "  - generate_certificate.sh"
echo "  - certs/local.crt"
echo "  - certs/local.key"
echo "  - .env"
echo ""
if [[ "$CERT_MODE" == "sslip" ]]; then
    if [[ "$CERT_RESULT" == "sslip" ]]; then
        echo -e "${GREEN}Dograh is running with a trusted certificate at:${NC}"
        echo ""
        echo -e "  ${BLUE}https://$PUBLIC_HOST_VALUE${NC}"
        echo ""
        echo -e "${GREEN}No browser warning — the certificate renews automatically before expiry.${NC}"
    else
        echo -e "${YELLOW}Dograh is running (with a temporary self-signed certificate) at:${NC}"
        echo ""
        echo -e "  ${BLUE}https://$PUBLIC_HOST_VALUE${NC}"
        echo ""
        echo -e "${YELLOW}Let's Encrypt issuance did not complete (see the message above). Your${NC}"
        echo -e "${YELLOW}browser will warn until a trusted certificate is issued.${NC}"
    fi
else
    echo -e "${YELLOW}To start Dograh, run:${NC}"
    echo ""
    if [[ "$DEPLOY_MODE" != "build" || "${REPO_SOURCE:-}" != "existing" ]]; then
        echo -e "  ${BLUE}cd $(pwd)${NC}"
    fi
    if [[ "$DEPLOY_MODE" == "build" ]]; then
        echo -e "  ${BLUE}./remote_up.sh --build${NC}"
        echo ""
        echo -e "${YELLOW}A docker-compose.override.yaml has been created alongside${NC}"
        echo -e "${YELLOW}docker-compose.yaml. Compose auto-loads it, so no -f flag is${NC}"
        echo -e "${YELLOW}needed — it swaps the prebuilt images for local builds.${NC}"
    else
        echo -e "  ${BLUE}./remote_up.sh${NC}"
    fi
    echo ""
    echo -e "${YELLOW}Your application will be available at:${NC}"
    echo ""
    echo -e "  ${BLUE}https://$PUBLIC_HOST_VALUE${NC}"
    echo ""
    echo -e "${YELLOW}Note:${NC} Your browser will show a security warning for the self-signed"
    echo "certificate. You can safely accept it to proceed."
fi
echo ""