# EnCoach — example VPS reverse-proxy config
#
# Sits in front of the docker-compose stack (frontend:80 + backend:8069).
# Copy to /etc/nginx/sites-available/encoach, edit server_name / TLS paths,
# symlink to sites-enabled, then `nginx -t && systemctl reload nginx`.
#
# The inner frontend container already raises its own nginx limits
# (see frontend/Dockerfile). If THIS outer proxy isn't raised too, the
# outer layer returns 413/504 before traffic ever reaches Odoo, and users
# see "Submit failed 413" or "Upload failed" with no server-side log entry.

# ─────────────────────────────────────────────────────────────────
# HTTP → HTTPS redirect (remove if you're not terminating TLS here)
server {
    listen 80;
    listen [::]:80;
    server_name encoach.example.com;
    return 301 https://$host$request_uri;
}

# ─────────────────────────────────────────────────────────────────
# Main TLS vhost
server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name encoach.example.com;

    ssl_certificate     /etc/letsencrypt/live/encoach.example.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/encoach.example.com/privkey.pem;
    ssl_protocols       TLSv1.2 TLSv1.3;
    ssl_ciphers         HIGH:!aNULL:!MD5;

    # ── CRITICAL ────────────────────────────────────────────────
    # Default nginx caps request bodies at 1 MB, which triggers
    # HTTP 413 on:
    #   * /api/resources          (PDF / audio / image uploads)
    #   * /api/exam/generation/submit (full module payload — can
    #     easily be 2–10 MB when all tasks are filled)
    #   * /api/approval-requests  (attachments on approval flow)
    # Match this value to Odoo's `limit_request` (128 MB).
    client_max_body_size       128m;
    client_body_buffer_size    1m;
    client_body_timeout        900s;
    large_client_header_buffers 4 16k;

    # ── Static / SPA served by the frontend container ───────────
    location / {
        proxy_pass         http://127.0.0.1:8080;   # docker-compose: frontend:80
        proxy_set_header   Host              $host;
        proxy_set_header   X-Real-IP         $remote_addr;
        proxy_set_header   X-Forwarded-For   $proxy_add_x_forwarded_for;
        proxy_set_header   X-Forwarded-Proto $scheme;
    }

    # ── Odoo API: AI calls can take minutes, needs long timeouts ─
    # Must exceed Odoo's limit_time_real (900s in odoo-docker.conf).
    # proxy_request_buffering off streams the body to Odoo instead of
    # buffering it entirely on disk → less chance of hitting the 413
    # when uploading big resources.
    location /api/ {
        proxy_pass                 http://127.0.0.1:8069/api/;
        proxy_set_header           Host              $host;
        proxy_set_header           X-Real-IP         $remote_addr;
        proxy_set_header           X-Forwarded-For   $proxy_add_x_forwarded_for;
        proxy_set_header           X-Forwarded-Proto $scheme;
        proxy_http_version         1.1;
        proxy_read_timeout         900s;
        proxy_send_timeout         900s;
        proxy_connect_timeout      60s;
        proxy_request_buffering    off;
        proxy_buffering            off;    # stream AI responses to the client
    }

    # ── Odoo web client + longpolling (optional, for /web/* URLs) ─
    location /longpolling/ {
        proxy_pass                 http://127.0.0.1:8069/longpolling/;
        proxy_http_version         1.1;
        proxy_read_timeout         3600s;
        proxy_send_timeout         3600s;
    }

    # Access / error logs — keep them separate so 413s are easy to spot
    access_log /var/log/nginx/encoach.access.log;
    error_log  /var/log/nginx/encoach.error.log warn;
}