"""将会话序列化为前端视图模型（含简体中文标签）。"""
from __future__ import annotations

import json
from functools import lru_cache
from pathlib import Path
from typing import Any, Dict, List, Optional

from game.sim.session import GameSession
from game.webapi.i18n import (
    atm_zh,
    light_zh,
    marker_zh,
    pace_zh,
    phase_zh,
    state_zh,
)

ROOT = Path(__file__).resolve().parents[2]

PHASE_BG = {
    "PREP": "assets/shop/interior_morning_01.jpg",
    "MORNING": "assets/shop/interior_morning_01.jpg",
    "AFTERNOON": "assets/shop/interior_afternoon_02.jpg",
    "DUSK": "assets/shop/interior_dusk_01.jpg",
    "CLOSING": "assets/shop/interior_golden_hour_honest_01.jpg",
    "NIGHT": "assets/shop/interior_night_01.jpg",
}

PHASE_ICON = {
    "PREP": "assets/ui/phase_morning_01.jpg",
    "MORNING": "assets/ui/phase_morning_01.jpg",
    "AFTERNOON": "assets/ui/phase_afternoon_01.jpg",
    "DUSK": "assets/ui/phase_dusk_01.jpg",
    "CLOSING": "assets/ui/phase_closing_01.jpg",
    "NIGHT": "assets/ui/phase_night_01.jpg",
}

KIND_ZH = {"regular": "熟客", "passerby": "路人"}


@lru_cache(maxsize=1)
def _manifest() -> Dict[str, str]:
    path = ROOT / "assets/manifest/assets.json"
    if not path.is_file():
        return {}
    try:
        data = json.loads(path.read_text(encoding="utf-8"))
    except Exception:
        return {}
    return dict(data.get("assets") or {})


def _exists(rel: Optional[str]) -> Optional[str]:
    if not rel:
        return None
    p = ROOT / rel
    return rel if p.is_file() else None


def _resolve_product_sprite(product_id: Optional[str], db) -> Optional[str]:
    if not product_id:
        return None
    prod = (db.products or {}).get(product_id) or {}
    for key in (
        prod.get("asset"),
        f"assets/products/{product_id}_01.jpg",
        _manifest().get(f"product.{product_id}"),
    ):
        hit = _exists(key)
        if hit:
            return hit
    return None


def _resolve_furniture_sprite(furniture_id: str, db) -> Optional[str]:
    fdef = (db.furniture or {}).get(furniture_id) or {}
    for key in (
        fdef.get("asset"),
        f"assets/furniture/{furniture_id}_01.jpg",
        _manifest().get(f"furniture.{furniture_id}"),
    ):
        hit = _exists(key)
        if hit:
            return hit
    return None


def _resolve_npc_portrait(npc_id: str, db) -> Optional[str]:
    npc = (db.npcs or {}).get(npc_id) or {}
    for key in (
        npc.get("portrait"),
        npc.get("asset"),
        f"assets/characters/{npc_id}_portrait_01.jpg",
        f"assets/characters/{npc_id}_01.jpg",
        _manifest().get(f"character.{npc_id}"),
        _manifest().get("character.regular_lan") if "lan" in npc_id else None,
        _manifest().get("character.regular_mori") if "mori" in npc_id else None,
    ):
        hit = _exists(key)
        if hit:
            return hit
    for name in (
        "assets/characters/passerby_student_01.jpg",
        "assets/characters/passerby_commuter_02.jpg",
        "assets/characters/passerby_elder_01.jpg",
    ):
        hit = _exists(name)
        if hit:
            return hit
    return None


def _npc_name(npc_id: str, db) -> str:
    npc = (db.npcs or {}).get(npc_id) or {}
    return str(npc.get("name") or npc.get("display_name") or npc_id)


def _product_name(product_id: str, db) -> str:
    prod = (db.products or {}).get(product_id) or {}
    return str(prod.get("name") or product_id)


def build_view(session: GameSession, log: Optional[List[str]] = None) -> Dict[str, Any]:
    db = session.db
    phase = session.day.phase.value
    markers = {k: [int(v[0]), int(v[1])] for k, v in session.space.markers.items()}
    pace_val = session.day.pace.value if hasattr(session.day.pace, "value") else str(session.day.pace)
    light = getattr(session.atmosphere, "light", "warm")

    furniture: List[dict] = []
    for item in session.state.get("shop", {}).get("layout") or []:
        fid = item.get("furniture_id") or ""
        fdef = (db.furniture or {}).get(fid) or {}
        furniture.append(
            {
                "id": item.get("instance_id"),
                "fid": fid,
                "name": fdef.get("name") or fid,
                "x": int(item.get("x", 0)),
                "y": int(item.get("y", 0)),
                "rot90": bool(item.get("rot90", False)),
                "sprite": _resolve_furniture_sprite(fid, db),
                "slots": list(fdef.get("display_slots") or []),
            }
        )

    displays: List[dict] = []
    raw_disp = session.state.get("shop", {}).get("displays") or {}
    for slot, info in raw_disp.items():
        info = info or {}
        pid = info.get("product_id")
        displays.append(
            {
                "slot": slot,
                "slot_label": slot.replace("_", " "),
                "product_id": pid,
                "name": _product_name(pid, db) if pid else "空",
                "qty": int(info.get("qty") or 0),
                "sprite": _resolve_product_sprite(pid, db) if pid else None,
            }
        )

    inventory: List[dict] = []
    inv = session.state.get("shop", {}).get("inventory") or {}
    for pid, qty in inv.items():
        inventory.append(
            {
                "product_id": pid,
                "name": _product_name(pid, db),
                "qty": int(qty),
                "price": int(((db.products or {}).get(pid) or {}).get("price") or 0),
                "sprite": _resolve_product_sprite(pid, db),
            }
        )
    inventory.sort(key=lambda x: (-x["qty"], x["name"]))

    agents: List[dict] = []
    for agent in list(session.director.agents):
        marker = agent.current_marker()
        xy = markers.get(marker) or markers.get("door") or [5, 9]
        st = agent.state.value if hasattr(agent.state, "value") else str(agent.state)
        agents.append(
            {
                "agent_id": agent.agent_id,
                "npc_id": agent.npc_id,
                "name": _npc_name(agent.npc_id, db),
                "kind": agent.kind,
                "kind_zh": KIND_ZH.get(agent.kind, agent.kind),
                "state": st,
                "state_zh": state_zh(st),
                "marker": marker,
                "marker_zh": marker_zh(marker),
                "xy": xy,
                "path": list(agent.path or []),
                "path_index": int(agent.path_index),
                "portrait": _resolve_npc_portrait(agent.npc_id, db),
                "bark": agent.last_bark,
                "target_product": agent.target_product,
                "target_name": _product_name(agent.target_product, db) if agent.target_product else None,
            }
        )

    atm = dict(session.atmosphere.snapshot or {})
    dims_list = []
    for k, v in atm.items():
        if isinstance(v, (int, float)):
            dims_list.append(
                {
                    "key": k,
                    "label": atm_zh(k),
                    "value": round(float(v), 3),
                    "pct": int(max(0, min(100, round(float(v) * 100)))),
                }
            )

    night = None
    if phase == "NIGHT":
        try:
            raw_night = session.night_summary()
            night = {
                "mood": raw_night.get("mood"),
                "diary": raw_night.get("diary"),
                "sales": raw_night.get("sales"),
                "revenue": raw_night.get("revenue"),
                "enters": raw_night.get("enters"),
                "top_dims": [atm_zh(x) if isinstance(x, str) else x for x in (raw_night.get("top_dims") or [])],
            }
        except Exception:
            night = None

    catalog: List[dict] = []
    for pid, prod in list((db.products or {}).items())[:40]:
        catalog.append(
            {
                "product_id": pid,
                "name": prod.get("name") or pid,
                "price": int(prod.get("price") or 0),
                "sprite": _resolve_product_sprite(pid, db),
            }
        )

    phases = [
        {"id": p, "label": phase_zh(p), "active": p == phase}
        for p in ("PREP", "MORNING", "AFTERNOON", "DUSK", "CLOSING", "NIGHT")
    ]

    return {
        "locale": "zh-CN",
        "meta": {
            "day_index": int(session.day.day_index),
            "phase": phase,
            "phase_zh": phase_zh(phase),
            "phase_elapsed": round(float(session.day.phase_elapsed), 2),
            "paused": bool(getattr(session.day, "paused", False)),
            "pace": pace_val,
            "pace_zh": pace_zh(pace_val),
            "day_label": f"第 {int(session.day.day_index) + 1} 天",
        },
        "phases": phases,
        "wallet": int(session.economy.wallet),
        "atmosphere": {
            "dims": dims_list,
            "mood_line": session.atmosphere.mood_line(),
            "light": light,
            "light_zh": light_zh(light),
            "bgm": getattr(session.atmosphere, "bgm", "quiet"),
        },
        "grid": {
            "w": int(session.space.width),
            "h": int(session.space.height),
            "markers": markers,
            "markers_zh": {k: marker_zh(k) for k in markers},
            "cell_tags": {
                f"{x},{y}": sorted(tags)
                for (x, y), tags in session.space.cell_tags.items()
                if tags - {"floor"}
            },
        },
        "furniture": furniture,
        "displays": displays,
        "inventory": inventory[:24],
        "catalog": catalog,
        "agents": agents,
        "log": list(log or session.phase_log)[-40:],
        "stats": {
            "enters": int(session.director.stats.get("enters", 0)),
            "sales": int(session.sales_count),
            "revenue": int(session.revenue),
            "barks": int(session.director.stats.get("barks", 0)),
        },
        "art": {
            "shop_bg": _exists(PHASE_BG.get(phase))
            or _exists("assets/shop/interior_alley_flower_shop_01.jpg"),
            "phase_icon": _exists(PHASE_ICON.get(phase)),
            "open_sign": _exists("assets/ui/open_sign_01.jpg"),
        },
        "night": night,
        "ui": {
            "can_open": phase == "PREP",
            "can_tick": phase not in ("PREP", "NIGHT"),
            "can_sleep": phase == "NIGHT",
            "can_prep_actions": phase == "PREP",
            # 与 Economy 规则一致：进货 PREP/NIGHT，上架仅 PREP
            "can_restock": phase in ("PREP", "NIGHT"),
            "can_stock_display": phase == "PREP",
            "restock_hint": (
                "现在可以进货"
                if phase in ("PREP", "NIGHT")
                else "进货仅限「营业前」与「夜晚」（营业中请专心待客）"
            ),
            "stock_hint": (
                "现在可以上架"
                if phase == "PREP"
                else "上架仅限「营业前」整理货架"
            ),
        },
    }