"""LLM World Planner for FlyBrain V8/V9.

Implements Sections 46, 50, 90:
- Translates natural language prompts into declarative structured WorldIntent.
- Resolves assets via AssetResolver and coordinates spatial placement.
- Offline-first: uses local Qwen LLM when available, falls back to deterministic semantic parser.
"""
import os
import json
import re
from typing import Dict, Any, List, Optional

from src.assets.compiler.types import AssetClass
from src.assets.resolver import AssetResolver


class WorldPlan:
    def __init__(self, raw_prompt: str, biome: str, structures: List[Dict[str, Any]],
                 water: Optional[Dict[str, Any]] = None, resolved_assets: Optional[List[Dict[str, Any]]] = None):
        self.raw_prompt = raw_prompt
        self.biome = biome
        self.structures = structures
        self.water = water
        self.resolved_assets = resolved_assets or []

    def to_dict(self) -> Dict[str, Any]:
        return {
            "raw_prompt": self.raw_prompt,
            "biome": self.biome,
            "structures": self.structures,
            "water": self.water,
            "resolved_assets": self.resolved_assets
        }


class WorldPlanner:
    def __init__(self, resolver: Optional[AssetResolver] = None):
        self.resolver = resolver or AssetResolver()

    def _extract_intent_llm(self, prompt: str) -> Optional[Dict[str, Any]]:
        try:
            from src.models.manager import get_model_manager
            mgr = get_model_manager()
            if not mgr.is_available("llm"):
                return None
            llm = mgr.get_llm()
            sys_msg = (
                "You are the FlyBrain World Planner. Output valid JSON only with keys: "
                "'biome', 'structures' (list of {type, material, span_m, width_m, x, y, z}), 'water'."
            )
            resp = llm.create_chat_completion(
                messages=[
                    {"role": "system", "content": sys_msg},
                    {"role": "user", "content": prompt}
                ],
                max_tokens=256,
                temperature=0.1
            )
            text = resp["choices"][0]["message"]["content"]
            # Extract JSON block
            m = re.search(r"\{.*\}", text, re.DOTALL)
            if m:
                return json.loads(m.group(0))
        except Exception:
            pass
        return None

    def _extract_intent_rule_based(self, prompt: str) -> Dict[str, Any]:
        p = prompt.lower()
        biome = "temperate_valley"
        if "pine" in p or "forest" in p:
            biome = "pine_forest"
        elif "mountain" in p or "rock" in p or "highland" in p:
            biome = "rocky_highlands"

        structures = []
        water = None

        if "bridge" in p:
            structures.append({
                "type": "wooden_bridge",
                "material": "wood",
                "span_m": 4.0,
                "width_m": 1.5,
                "x": 2.0,
                "y": 5.0,
                "z": 0.0
            })
            water = {"type": "stream", "x": 2.0, "y": 5.0, "width": 2.5}

        if "tower" in p or "watchtower" in p:
            structures.append({
                "type": "watchtower",
                "material": "wood",
                "sx": 2.5,
                "sy": 2.5,
                "sz": 6.0,
                "x": -5.0,
                "y": 6.0,
                "z": 0.0
            })

        if "cabin" in p or "house" in p or "settlement" in p:
            structures.append({
                "type": "log_cabin",
                "material": "wood",
                "sx": 4.0,
                "sy": 4.0,
                "sz": 2.8,
                "x": -6.0,
                "y": 8.0,
                "z": 0.0
            })

        if not structures:
            structures.append({
                "type": "marker_structure",
                "material": "stone",
                "sx": 1.0,
                "sy": 1.0,
                "sz": 1.0,
                "x": 0.0,
                "y": 6.0,
                "z": 0.0
            })

        return {"biome": biome, "structures": structures, "water": water}

    def plan_world(self, prompt: str, seed: int = 42) -> WorldPlan:
        """Section 46 & 90: Generates structured declarative plan and resolves assets."""
        intent = self._extract_intent_llm(prompt)
        if not intent or "structures" not in intent:
            intent = self._extract_intent_rule_based(prompt)

        biome = intent.get("biome", "temperate_valley")
        raw_structs = intent.get("structures", [])
        water = intent.get("water")

        resolved = []
        for s in raw_structs:
            stype = s.get("type", "structure")
            params = {k: v for k, v in s.items() if k not in ("type", "x", "y", "z")}
            res = self.resolver.resolve_asset(
                semantic_name=stype,
                category=AssetClass.STRUCTURE,
                params=params,
                seed=seed
            )
            resolved.append({
                **s,
                "resolution": res
            })

        return WorldPlan(
            raw_prompt=prompt,
            biome=biome,
            structures=raw_structs,
            water=water,
            resolved_assets=resolved
        )