v0.1.0 — M1: Project Setup + Tilemap + Combat + Backend
Frontend: - HTML5 Canvas isometric tilemap renderer - Eichenhafen starting city (procedural) - Click-to-move A* pathfinding - Player stats, HP/SP/EXP bars, skill bar, minimap - 3 NPCs (merchant, class master, innkeeper) - 6 monster spawns with aggro AI - Combat: auto-attack, damage numbers, EXP/gold - Player death + respawn Backend: - FastAPI server with SQLite - Ollama LLM bridge for events + dialogue - Event validation (no soft-lock) - NPC dialogue generation Design: - Full DESIGN.md with architecture, formulas, milestones - 6 base classes + 6 advanced classes - 3 fixed cities, dynamic events
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"""
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Aether Chronicles — Backend Server
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FastAPI + Ollama LLM integration for dynamic world events
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"""
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import json
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import sqlite3
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import time
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import random
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from datetime import datetime
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from typing import Optional
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from fastapi import FastAPI, HTTPException
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from fastapi.middleware.cors import CORSMiddleware
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from pydantic import BaseModel
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app = FastAPI(title="Aether Chronicles API", version="0.1.0")
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# CORS for frontend
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app.add_middleware(
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CORSMiddleware,
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allow_origins=["*"],
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allow_methods=["*"],
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allow_headers=["*"],
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)
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DB_PATH = "/home/natiris/Dokumente/aether-chronicles/backend/gamestate.db"
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# ============================================================
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# Database
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# ============================================================
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def init_db():
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conn = sqlite3.connect(DB_PATH)
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c = conn.cursor()
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c.executescript("""
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CREATE TABLE IF NOT EXISTS player (
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id INTEGER PRIMARY KEY DEFAULT 1,
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name TEXT DEFAULT 'Wanderer',
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class TEXT DEFAULT 'wanderer',
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level INTEGER DEFAULT 1,
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exp INTEGER DEFAULT 0,
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hp INTEGER DEFAULT 100,
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max_hp INTEGER DEFAULT 100,
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sp INTEGER DEFAULT 50,
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max_sp INTEGER DEFAULT 50,
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x REAL DEFAULT 20,
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y REAL DEFAULT 20,
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map_id TEXT DEFAULT 'eichenhafen',
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gold INTEGER DEFAULT 100
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);
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CREATE TABLE IF NOT EXISTS world_events (
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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map_id TEXT NOT NULL,
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event_type TEXT,
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description TEXT,
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data_json TEXT,
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active INTEGER DEFAULT 1,
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created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
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);
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CREATE TABLE IF NOT EXISTS npc_dialogues (
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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npc_id TEXT NOT NULL,
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mood TEXT,
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dialogue TEXT,
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created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
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);
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INSERT OR IGNORE INTO player (id) VALUES (1);
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""")
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conn.commit()
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conn.close()
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init_db()
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# ============================================================
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# LLM Bridge (Ollama)
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# ============================================================
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OLLAMA_URL = "http://127.0.0.1:11434"
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LLM_MODEL = "gemma4:12b"
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# Event templates by map type
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MAP_CONTEXTS = {
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"eichenhafen": {
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"name": "Eichenhafen",
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"type": "harbor_city",
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"moods": ["friedlich", "geschäftig", "neblig", "stürmisch"],
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"event_types": ["weather", "discovery", "npc_mood", "visitor"]
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},
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"eichenhafen_field": {
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"name": "Felder von Eichenhafen",
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"type": "grassland",
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"moods": ["sonnig", "windig", "regnerisch", "neblig"],
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"event_types": ["weather", "encounter", "discovery", "caravan"]
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},
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"sonnenfeld": {
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"name": "Sonnenfeld",
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"type": "trade_city",
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"moods": ["geschäftig", "festlich", "regnerisch", "heiß"],
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"event_types": ["market_event", "visitor", "weather", "discovery"]
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},
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"nebelgipfel": {
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"name": "Nebelgipfel",
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"type": "mountain_fortress",
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"moods": ["kalt", "stürmisch", "schneiend", "neblig"],
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"event_types": ["weather", "encounter", "discovery", "danger"]
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}
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}
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# NPC personalities
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NPC_PERSONALITIES = {
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"merchant_eichenhafen": {
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"name": "Händler Bruno",
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"role": "Händler",
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"personality": "freundlich, geschwätzig, immer auf der Suche nach Profit",
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"city": "Eichenhafen"
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},
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"class_master": {
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"name": "Meisterin Vera",
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"role": "Klassenmeisterin",
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"personality": "weise, streng aber gerecht, respektvoll",
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"city": "Eichenhafen"
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},
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"innkeeper": {
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"name": "Wirtin Helga",
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"role": "Schenkenwirtin",
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"personality": "warmherzig, mütterlich, kennt alle Gerüchte",
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"city": "Eichenhafen"
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}
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}
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def call_ollama(prompt: str, system: str = "") -> Optional[str]:
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"""Call local Ollama LLM."""
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try:
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import ollama
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response = ollama.chat(
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model=LLM_MODEL,
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messages=[
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{"role": "system", "content": system},
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{"role": "user", "content": prompt}
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],
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options={"temperature": 0.8, "num_ctx": 4096}
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)
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return response["message"]["content"].strip()
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except Exception as e:
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print(f"[LLM] Error: {e}")
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return None
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def validate_event(event: dict, map_id: str) -> bool:
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"""
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Validate LLM-generated event against safety rules.
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Returns True if event is safe to apply.
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"""
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# Never block paths
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if event.get("effect") in ["block_path", "move_npc", "required"]:
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return False
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# Must be optional
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if event.get("required") is True:
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return False
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# Type must be known
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if event.get("type") not in ["weather", "encounter", "discovery", "npc_mood",
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"market_event", "visitor", "caravan", "danger"]:
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return False
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return True
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def generate_event(map_id: str, player_level: int) -> Optional[dict]:
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"""Generate a dynamic event for a map via LLM."""
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ctx = MAP_CONTEXTS.get(map_id, MAP_CONTEXTS["eichenhafen"])
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prompt = f"""Du bist der Dungeon Master für Aether Chronicles.
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Aktuelle Karte: {ctx['name']} ({ctx['type']})
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Spieler Level: {player_level}
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Tageszeit: {datetime.now().strftime('%H:%M')}
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Generiere EIN optionales Event für diese Karte. Regeln:
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- Muss optional sein (Spieler kann es ignorieren)
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- Darf keine Wege blockieren
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- Darf keine NPCs verschieben
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- Kurz halten (2-3 Sätze Beschreibung)
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Antworte NUR als JSON:
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{{
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"type": "weather|encounter|discovery|npc_mood",
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"description": "...",
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"effect": "buff|debuff|spawn|dialogue|atmosphere",
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"data": {{}}
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}}
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"""
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system = "Du bist ein kreativer Dungeon Master für ein Fantasy-RPG. Antworte NUR mit gültigem JSON."
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result = call_ollama(prompt, system)
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if not result:
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# Fallback: no event
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return None
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try:
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# Extract JSON from response
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json_str = result
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if "```json" in json_str:
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json_str = json_str.split("```json")[1].split("```")[0]
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elif "```" in json_str:
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json_str = json_str.split("```")[1].split("```")[0]
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event = json.loads(json_str.strip())
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if validate_event(event, map_id):
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return event
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else:
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print(f"[LLM] Event rejected by validation: {event}")
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return None
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except (json.JSONDecodeError, KeyError) as e:
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print(f"[LLM] Failed to parse event: {e}")
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return None
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def generate_dialogue(npc_id: str, player_class: str, player_level: int, mood: str = "neutral") -> str:
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"""Generate NPC dialogue via LLM."""
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npc = NPC_PERSONALITIES.get(npc_id)
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if not npc:
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return "Hallo, Reisender."
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prompt = f"""Du bist {npc['name']}, ein {npc['role']} in {npc['city']}.
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Deine Persönlichkeit: {npc['personality']}
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Aktuelle Stimmung: {mood}
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Der Spieler ({player_class}, Level {player_level}) spricht dich an.
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Sage etwas passendes (2-3 Sätze). Sei kurz und in Charakter.
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"""
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result = call_ollama(prompt)
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if result:
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# Cache the dialogue
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conn = sqlite3.connect(DB_PATH)
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c = conn.cursor()
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c.execute("INSERT INTO npc_dialogues (npc_id, mood, dialogue) VALUES (?, ?, ?)",
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(npc_id, mood, result))
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conn.commit()
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conn.close()
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return result
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# Fallback
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return f"{npc['name']}: Sei gegrüßt, Reisender."
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# ============================================================
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# API Endpoints
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# ============================================================
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class PlayerState(BaseModel):
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name: str = "Wanderer"
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class_name: str = "wanderer"
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level: int = 1
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exp: int = 0
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hp: int = 100
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max_hp: int = 100
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sp: int = 50
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max_sp: int = 50
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x: float = 20.0
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y: float = 20.0
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map_id: str = "eichenhafen"
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gold: int = 100
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@app.get("/api/player")
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def get_player():
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conn = sqlite3.connect(DB_PATH)
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c = conn.cursor()
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c.execute("SELECT * FROM player WHERE id = 1")
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row = c.fetchone()
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conn.close()
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if row:
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return {
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"id": row[0], "name": row[1], "class": row[2], "level": row[3],
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"exp": row[4], "hp": row[5], "max_hp": row[6], "sp": row[7],
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"max_sp": row[8], "x": row[9], "y": row[10], "map_id": row[11],
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"gold": row[12]
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}
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return {"error": "No player found"}
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@app.post("/api/player/save")
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def save_player(state: PlayerState):
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conn = sqlite3.connect(DB_PATH)
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c = conn.cursor()
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c.execute("""INSERT OR REPLACE INTO player
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(id, name, class, level, exp, hp, max_hp, sp, max_sp, x, y, map_id, gold)
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VALUES (1, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)""",
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(state.name, state.class_name, state.level, state.exp,
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state.hp, state.max_hp, state.sp, state.max_sp,
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state.x, state.y, state.map_id, state.gold))
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conn.commit()
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conn.close()
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return {"status": "saved"}
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@app.get("/api/events/{map_id}")
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def get_events(map_id: str):
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conn = sqlite3.connect(DB_PATH)
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c = conn.cursor()
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c.execute("SELECT * FROM world_events WHERE map_id = ? AND active = 1", (map_id,))
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rows = c.fetchall()
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conn.close()
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events = []
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for row in rows:
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events.append({
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"id": row[0], "map_id": row[1], "type": row[2],
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"description": row[3], "data": json.loads(row[4]) if row[4] else {},
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"active": row[5]
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})
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return {"events": events}
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@app.post("/api/llm/event")
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def create_event(map_id: str, player_level: int = 1):
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event = generate_event(map_id, player_level)
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if event:
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conn = sqlite3.connect(DB_PATH)
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c = conn.cursor()
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c.execute("INSERT INTO world_events (map_id, event_type, description, data_json) VALUES (?, ?, ?, ?)",
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(map_id, event.get("type"), event.get("description", ""), json.dumps(event.get("data", {}))))
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conn.commit()
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conn.close()
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return {"event": event}
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return {"event": None, "message": "No event generated (validation failed or LLM unavailable)"}
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@app.post("/api/llm/dialogue")
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def create_dialogue(npc_id: str, player_class: str = "wanderer", player_level: int = 1, mood: str = "neutral"):
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dialogue = generate_dialogue(npc_id, player_class, player_level, mood)
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return {"dialogue": dialogue}
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@app.get("/api/health")
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def health():
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return {"status": "ok", "llm_model": LLM_MODEL, "time": datetime.now().isoformat()}
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if __name__ == "__main__":
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import uvicorn
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uvicorn.run(app, host="0.0.0.0", port=8000)
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