#!/bin/sh
# ============================================
# Chat Switchboard - Frontend Entrypoint
# ============================================
# Injects BASE_PATH into index.html and nginx
# config at container startup. Supports path-
# based multi-env deployment on a single domain.
#
# Environment:
#   BASE_PATH  - URL prefix (e.g. "/dev", "/test", or "")
# ============================================
set -e

BASE_PATH="${BASE_PATH:-}"

# Read version from VERSION file (baked in at build time)
APP_VERSION="dev"
if [ -f /VERSION ]; then
    APP_VERSION=$(cat /VERSION | tr -d '[:space:]')
fi

# Compute base href (needs trailing slash for <base> tag)
if [ -z "${BASE_PATH}" ]; then
    BASE_HREF="/"
else
    BASE_HREF="${BASE_PATH}/"
fi

# ── Read branding config ────────────────────
BRANDING_JSON="{}"
if [ -f /branding/branding.json ]; then
    # Compact to single line for safe sed injection
    BRANDING_JSON=$(tr -d '\n' < /branding/branding.json | sed 's/  */ /g')
    echo "✅ Branding config loaded from /branding/branding.json"
else
    echo "ℹ️  No branding mount — using defaults"
fi

# ── Inject into index.html ──────────────────
sed -i \
    -e "s|%%BASE_PATH%%|${BASE_PATH}|g" \
    -e "s|%%BASE_HREF%%|${BASE_HREF}|g" \
    -e "s|%%APP_VERSION%%|${APP_VERSION}|g" \
    -e "s|%%BRANDING_JSON%%|${BRANDING_JSON}|g" \
    /usr/share/nginx/html/index.html

echo "✅ Frontend configured: BASE_PATH=${BASE_PATH:-/} VERSION=${APP_VERSION}"

# ── Generate nginx config ───────────────────
# If BASE_PATH is set, serve under that prefix with alias.
# If empty, serve from root (default behavior).
if [ -z "${BASE_PATH}" ]; then
    cat > /etc/nginx/conf.d/default.conf <<'NGINX'
server {
    listen 80;
    server_name _;
    root /usr/share/nginx/html;
    index index.html;

    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_proxied expired no-cache no-store private auth;
    gzip_types text/plain text/css text/xml text/javascript application/x-javascript application/xml application/javascript;

    location ~* \.(jpg|jpeg|png|gif|ico|css|js|woff|woff2)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
    }

    # Branding assets — served from volume mount, 404s gracefully
    location /branding/ {
        alias /branding/;
        expires 1h;
        add_header Cache-Control "public";
        try_files $uri =404;
    }

    location / {
        try_files $uri $uri/ /index.html;
    }

    # Health check for k8s probes
    location = /healthz {
        return 200 'ok';
        add_header Content-Type text/plain;
    }

    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-XSS-Protection "1; mode=block" always;
}
NGINX
else
    cat > /etc/nginx/conf.d/default.conf <<NGINX
server {
    listen 80;
    server_name _;

    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_proxied expired no-cache no-store private auth;
    gzip_types text/plain text/css text/xml text/javascript application/x-javascript application/xml application/javascript;

    location ${BASE_PATH}/ {
        alias /usr/share/nginx/html/;
        try_files \$uri \$uri/ ${BASE_PATH}/index.html;

        location ~* \.(jpg|jpeg|png|gif|ico|css|js|woff|woff2)\$ {
            expires 1y;
            add_header Cache-Control "public, immutable";
        }
    }

    # Branding assets — under BASE_PATH so Traefik routes them here
    location ${BASE_PATH}/branding/ {
        alias /branding/;
        expires 1h;
        add_header Cache-Control "public";
        try_files \$uri =404;
    }

    # Redirect bare path to trailing slash
    location = ${BASE_PATH} {
        return 301 ${BASE_PATH}/;
    }

    # Health check for k8s probes (always at root)
    location = /healthz {
        return 200 'ok';
        add_header Content-Type text/plain;
    }

    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-XSS-Protection "1; mode=block" always;
}
NGINX
fi

# ── Start nginx ─────────────────────────────
exec nginx -g 'daemon off;'