from __future__ import annotations

from dataclasses import dataclass
from enum import Enum

from PWF.Convention.Runtime.Config import *
from PWF.Convention.Runtime.Architecture import Architecture
from PWF.Convention.Runtime.GlobalConfig import ConsoleFrontColor, ProjectConfig
from PWF.CoreModules.database import get_db
from PWF.CoreModules.flags import get_internal_debug

from .WPSAPI import GuideEntry, GuideSection, WPSAPI

logger: ProjectConfig = Architecture.Get(ProjectConfig)


class BackpackItemTier(Enum):
    """背包物品等级定义"""

    COMMON = ("普通", "#C0C0C0")
    RARE = ("稀有", "#4DA6FF")
    EPIC = ("史诗", "#B266FF")
    LEGENDARY = ("传说", "#FF9933")

    def __init__(self, display_name: str, color_hex: str):
        self.display_name = display_name
        self.color_hex = color_hex

    @classmethod
    def from_string(cls, value: str) -> "BackpackItemTier":
        for tier in cls:
            if tier.name == value or tier.display_name == value:
                return tier
        raise ValueError(f"Unknown backpack item tier: {value}")

    def to_markdown_label(self, content: str) -> str:
        return f'<font color="{self.color_hex}">{content}</font>'


@dataclass(frozen=True)
class BackpackItemDefinition:
    item_id: str
    name: str
    tier: BackpackItemTier
    description: str


@dataclass(frozen=True)
class BackpackUserItem:
    item_id: str
    quantity: int
    definition: BackpackItemDefinition


class WPSBackpackSystem(WPSAPI):
    """背包基础系统，负责物品注册与用户物品存取"""

    ITEMS_TABLE = "backpack_items"
    USER_ITEMS_TABLE = "backpack_user_items"

    def get_guide_subtitle(self) -> str:
        return "管理物品注册、背包存储与查询的核心系统"

    def get_guide_metadata(self) -> Dict[str, str]:
        return {
            "物品缓存数": str(len(self._item_cache)),
            "数据表": f"{self.ITEMS_TABLE}, {self.USER_ITEMS_TABLE}",
        }

    def collect_command_entries(self) -> Sequence[GuideEntry]:
        return (
            {
                "title": "背包",
                "identifier": "背包",
                "description": "以稀有度分组展示用户当前携带物品。",
                "metadata": {"别名": "backpack"},
            },
        )

    def collect_guide_entries(self) -> Sequence[GuideEntry]:
        tier_labels = ", ".join(tier.display_name for tier in BackpackItemTier)
        return (
            {
                "title": "物品注册",
                "description": (
                    "`register_item(item_id, name, tier, description)` "
                    "将物品写入背包表，重复调用会更新名称、稀有度和描述。"
                ),
            },
            {
                "title": "稀有度体系",
                "description": f"支持稀有度：{tier_labels}，调用 `to_markdown_label` 可渲染彩色标签。",
            },
            {
                "title": "库存操作",
                "description": (
                    "`add_item` / `set_item_quantity` / `_get_user_quantity` "
                    "确保用户物品数量保持非负，并自动创建记录。"
                ),
            },
        )

    def __init__(self) -> None:
        super().__init__()
        self._item_cache: Dict[str, BackpackItemDefinition] = {}

    @override
    def dependencies(self) -> List[type]:
        return [WPSAPI]

    @override
    def is_enable_plugin(self) -> bool:
        return True

    @override
    def register_db_model(self):
        from PWF.CoreModules.plugin_interface import DatabaseModel

        models = [
            DatabaseModel(
                table_name=self.ITEMS_TABLE,
                column_defs={
                    "item_id": "TEXT PRIMARY KEY",
                    "name": "TEXT NOT NULL",
                    "tier": "TEXT NOT NULL",
                    "description": "TEXT NOT NULL DEFAULT ''",
                },
            ),
            DatabaseModel(
                table_name=self.USER_ITEMS_TABLE,
                column_defs={
                    "user_id": "INTEGER NOT NULL",
                    "item_id": "TEXT NOT NULL",
                    "quantity": "INTEGER NOT NULL DEFAULT 0",
                    "PRIMARY KEY (user_id, item_id)": "",
                },
            ),
        ]
        return models

    @override
    def wake_up(self) -> None:
        db = get_db()
        db.define_column(self.ITEMS_TABLE, "description", "TEXT NOT NULL DEFAULT ''")
        logger.Log(
            "Info",
            f"{ConsoleFrontColor.GREEN}WPSBackpackSystem 插件已加载{ConsoleFrontColor.RESET}",
        )
        self.register_plugin("背包")
        self.register_plugin("backpack")
        self._warm_item_cache()

    def _warm_item_cache(self) -> None:
        cursor = get_db().conn.cursor()
        cursor.execute(
            f"SELECT item_id, name, tier, description FROM {self.ITEMS_TABLE}"
        )
        rows = cursor.fetchall()
        for row in rows:
            tier = BackpackItemTier.from_string(row["tier"])
            description = row["description"] or ""
            self._item_cache[row["item_id"]] = BackpackItemDefinition(
                item_id=row["item_id"],
                name=row["name"],
                tier=tier,
                description=description,
            )

    def _iter_registered_items(self) -> Sequence[BackpackItemDefinition]:
        try:
            if not self._item_cache:
                self._warm_item_cache()
        except Exception:
            return ()
        return tuple(self._item_cache.values())

    def get_items_by_tier(
        self,
        tier: BackpackItemTier,
        *,
        blacklist: Optional[Collection[str]] = None,
    ) -> List[BackpackItemDefinition]:
        normalized_blacklist: Set[str] = set()
        if blacklist:
            normalized_blacklist = {
                str(item_id).strip().lower()
                for item_id in blacklist
                if str(item_id).strip()
            }
        items: List[BackpackItemDefinition] = []
        for definition in self._iter_registered_items():
            if definition.tier != tier:
                continue
            if normalized_blacklist and definition.item_id.lower() in normalized_blacklist:
                continue
            items.append(definition)
        return items

    def collect_additional_sections(self) -> Sequence[GuideSection]:
        sections = list(super().collect_additional_sections())
        item_entries: List[GuideEntry] = []
        tier_icons = {
            BackpackItemTier.COMMON: "🪙",
            BackpackItemTier.RARE: "💠",
            BackpackItemTier.EPIC: "⚡",
            BackpackItemTier.LEGENDARY: "🌟",
        }
        for definition in self._iter_registered_items():
            item_entries.append(
                GuideEntry(
                    title=definition.name,
                    identifier=definition.item_id,
                    description=definition.description or "（暂无描述）",
                    category="背包物品",
                    metadata={
                        "稀有度": definition.tier.display_name,
                    },
                    icon=tier_icons.get(definition.tier, "🎁"),
                    tags=(definition.tier.display_name,),
                    group=definition.tier.display_name,
                )
            )
        if item_entries:
            sections.append(
                GuideSection(
                    title="物品图鉴",
                    entries=item_entries,
                    layout="grid",
                    section_id="backpack-items",
                    description="当前已注册的背包物品列表，按稀有度分组展示。",
                )
            )
        return tuple(sections)

    # region 对外接口

    def register_item(
        self,
        item_id: str,
        name: str,
        tier: BackpackItemTier,
        description: str,
    ) -> None:
        if not item_id or not name:
            raise ValueError("item_id and name must be provided")
        cursor = get_db().conn.cursor()
        cursor.execute(
            f"""
            INSERT INTO {self.ITEMS_TABLE} (item_id, name, tier, description)
            VALUES (?, ?, ?, ?)
            ON CONFLICT(item_id) DO UPDATE
                SET name = excluded.name,
                    tier = excluded.tier,
                    description = excluded.description
            """,
            (item_id, name, tier.name, description or ""),
        )
        get_db().conn.commit()
        self._item_cache[item_id] = BackpackItemDefinition(
            item_id=item_id,
            name=name,
            tier=tier,
            description=description or "",
        )

    def add_item(
        self,
        user_id: int,
        item_id: str,
        delta: int,
    ) -> int:
        if delta == 0:
            definition = self._get_definition(item_id)
            return self._get_user_quantity(user_id, item_id, definition)
        if delta < 0:
            raise ValueError("delta must be positive when using add_item")
        definition = self._get_definition(item_id)
        cursor = get_db().conn.cursor()
        cursor.execute(
            f"""
            INSERT INTO {self.USER_ITEMS_TABLE} (user_id, item_id, quantity)
            VALUES (?, ?, ?)
            ON CONFLICT(user_id, item_id) DO UPDATE
                SET quantity = {self.USER_ITEMS_TABLE}.quantity + excluded.quantity
            """,
            (user_id, item_id, delta),
        )
        get_db().conn.commit()
        return self._get_user_quantity(user_id, item_id, definition)

    def set_item_quantity(
        self,
        user_id: int,
        item_id: str,
        quantity: int,
    ) -> int:
        if quantity < 0:
            raise ValueError("quantity must be non-negative")
        definition = self._get_definition(item_id)
        cursor = get_db().conn.cursor()
        cursor.execute(
            f"""
            INSERT INTO {self.USER_ITEMS_TABLE} (user_id, item_id, quantity)
            VALUES (?, ?, ?)
            ON CONFLICT(user_id, item_id) DO UPDATE
                SET quantity = excluded.quantity
            """,
            (user_id, item_id, quantity),
        )
        get_db().conn.commit()
        return self._get_user_quantity(user_id, item_id, definition)

    def get_user_items(self, user_id: int) -> List[BackpackUserItem]:
        cursor = get_db().conn.cursor()
        cursor.execute(
            f"""
            SELECT ui.item_id, ui.quantity, i.name, i.tier, i.description
            FROM {self.USER_ITEMS_TABLE} ui
            JOIN {self.ITEMS_TABLE} i ON ui.item_id = i.item_id
            WHERE ui.user_id = ? AND ui.quantity > 0
            ORDER BY ui.quantity DESC
            """,
            (user_id,),
        )
        rows = cursor.fetchall()
        result: List[BackpackUserItem] = []
        for row in rows:
            definition = self._item_cache.get(row["item_id"])
            if not definition:
                try:
                    definition = BackpackItemDefinition(
                        item_id=row["item_id"],
                        name=row["name"],
                        tier=BackpackItemTier.from_string(row["tier"]),
                        description=row["description"] or "",
                    )
                except ValueError:
                    continue
            result.append(
                BackpackUserItem(
                    item_id=row["item_id"],
                    quantity=row["quantity"],
                    definition=definition,
                )
            )
        return result

    # endregion

    def _get_definition(self, item_id: str) -> BackpackItemDefinition:
        if item_id in self._item_cache:
            return self._item_cache[item_id]
        cursor = get_db().conn.cursor()
        cursor.execute(
            f"SELECT item_id, name, tier, description FROM {self.ITEMS_TABLE} WHERE item_id = ?",
            (item_id,),
        )
        row = cursor.fetchone()
        if not row:
            raise ValueError(f"Item {item_id} not registered in backpack system")
        definition = BackpackItemDefinition(
            item_id=row["item_id"],
            name=row["name"],
            tier=BackpackItemTier.from_string(row["tier"]),
            description=row["description"] or "",
        )
        self._item_cache[item_id] = definition
        return definition

    def _get_user_quantity(
        self,
        user_id: int,
        item_id: str,
        definition: BackpackItemDefinition,
    ) -> int:
        cursor = get_db().conn.cursor()
        cursor.execute(
            f"""
            SELECT quantity
            FROM {self.USER_ITEMS_TABLE}
            WHERE user_id = ? AND item_id = ?
            """,
            (user_id, item_id),
        )
        row = cursor.fetchone()
        quantity = int(row["quantity"]) if row else 0
        if quantity == 0:
            cursor.execute(
                f"""
                DELETE FROM {self.USER_ITEMS_TABLE}
                WHERE user_id = ? AND item_id = ?
                """,
                (user_id, item_id),
            )
            get_db().conn.commit()
        return quantity

    def _format_backpack_markdown(self, user_items: List[BackpackUserItem]) -> str:
        if not user_items:
            return "# 🎒 背包一览\n> 当前背包空空如也，去冒险获取一些物品吧！"

        lines = ["# 🎒 背包一览"]
        sorted_items = sorted(
            user_items,
            key=lambda item: (
                list(BackpackItemTier).index(item.definition.tier),
                -item.quantity,
                item.definition.name,
            ),
        )
        for entry in sorted_items:
            tier_label = entry.definition.tier.to_markdown_label(
                entry.definition.tier.display_name
            )
            lines.append(
                f"- {tier_label} · {entry.definition.name} × **{entry.quantity}**"
            )
        return "\n".join(lines)

    @override
    async def callback(self, message: str, chat_id: int, user_id: int) -> Optional[str]:
        message = self.parse_message_after_at(message).strip()
        user_items = self.get_user_items(user_id)
        markdown = self._format_backpack_markdown(user_items)
        await self.send_markdown_message(markdown, chat_id, user_id)
        return None


class WPSItemDescription(WPSAPI):
    @override
    def dependencies(self) -> List[type]:
        return [WPSBackpackSystem]

    @override
    def is_enable_plugin(self) -> bool:
        return True

    def __init__(self) -> None:
        super().__init__()
        from Plugins.WPSCombatSystem.combat_models import ADVENTURE_SOUVENIRS
        from Plugins.WPSGardenSystem.garden_models import GARDEN_CROPS
        from Plugins.WPSGardenSystem.garden_service import GardenConfig

        self._backpack: Optional[WPSBackpackSystem] = None
        self._souvenir_prices: Dict[str, int] = {
            item_id: sell_price
            for item_id, (_, __, sell_price, ___) in ADVENTURE_SOUVENIRS.items()
        }
        self._garden_crops = GARDEN_CROPS
        self._garden_sale_multiplier = GardenConfig.load().sale_multiplier

    @override
    def wake_up(self) -> None:
        self._backpack = Architecture.Get(WPSBackpackSystem)
        self.register_plugin("查看")
        self.register_plugin("view")

    async def callback(self, message: str, chat_id: int, user_id: int) -> Optional[str]:
        payload = self.parse_message_after_at(message).strip()
        if not payload:
            return await self.send_markdown_message("❌ 指令格式：`查看 <物品ID或名称>`", chat_id, user_id)

        definition = self._resolve_definition(payload)
        if not definition:
            return await self.send_markdown_message("❌ 未找到对应物品，请确认输入是否正确", chat_id, user_id)

        sale_info = self._get_sale_info(definition.item_id)
        markdown = self._format_markdown(definition, sale_info)
        return await self.send_markdown_message(markdown, chat_id, user_id)

    def _resolve_definition(self, identifier: str) -> Optional[BackpackItemDefinition]:
        lowered = identifier.strip().lower()
        db = get_db().conn.cursor()
        db.execute(
            f"""
            SELECT item_id
            FROM {WPSBackpackSystem.ITEMS_TABLE}
            WHERE lower(item_id) = ? OR lower(name) = ?
            LIMIT 1
            """,
            (lowered, lowered),
        )
        row = db.fetchone()
        item_id = row["item_id"] if row else identifier.strip()
        backpack = self._backpack or Architecture.Get(WPSBackpackSystem)
        try:
            return backpack._get_definition(item_id)
        except Exception:
            return None

    def _get_sale_info(self, item_id: str) -> Optional[Dict[str, str]]:
        if item_id in self._souvenir_prices:
            price = self._souvenir_prices[item_id]
            return {
                "category": "战斗纪念品",
                "price": f"{price} 分/个",
                "note": "在战斗系统中出售可立即换取积分。",
            }

        for crop in self._garden_crops.values():
            if crop.fruit_id == item_id:
                price = crop.seed_price * self._garden_sale_multiplier
                return {
                    "category": "菜园果实",
                    "price": f"{price} 分/个",
                    "note": "可通过 `菜园 售出 <果实> <数量>` 换取积分。",
                }
        return None

    def _format_markdown(
        self,
        definition: BackpackItemDefinition,
        sale_info: Optional[Dict[str, str]],
    ) -> str:
        tier_label = definition.tier.to_markdown_label(definition.tier.display_name)
        lines = [
            "# 🔍 物品详情",
            f"- 名称：{definition.name}",
            f"- ID：`{definition.item_id}`",
            f"- 稀有度：{tier_label}",
            f"- 描述：{definition.description or '（暂无描述）'}",
        ]
        if sale_info:
            lines.append(f"- 分类：{sale_info['category']}")
            lines.append(f"- 系统售价：{sale_info['price']}")
            note = sale_info.get("note")
            if note:
                lines.append(f"- 提示：{note}")
        return "\n".join(lines)


if get_internal_debug():
    class WPSDebugGiveItem(WPSAPI):
        @override
        def dependencies(self) -> List[type]:
            return [WPSBackpackSystem]
        
        @override
        def is_enable_plugin(self) -> bool:
            return True
        
        @override
        def wake_up(self) -> None:
            self.register_plugin("give")
        
        async def callback(self, message: str, chat_id: int, user_id: int) -> Optional[str]:
            payload = self.parse_message_after_at(message).strip()
            if payload == "":
                return await self.send_markdown_message("❌ 指令格式：`give <物品ID> [数量]`", chat_id, user_id)
            tokens = [token.strip() for token in payload.split() if token.strip()]
            if not tokens or not tokens[0]:
                return await self.send_markdown_message("❌ 指令格式：`give <物品ID> [数量]`", chat_id, user_id)
            item_id = tokens[0]
            quantity = int(tokens[1]) if len(tokens) > 1 else 1
            if quantity <= 0:
                return await self.send_markdown_message("❌ 数量必须大于0", chat_id, user_id)
            backpack: WPSBackpackSystem = Architecture.Get(WPSBackpackSystem)
            backpack.add_item(user_id, item_id, quantity)
            return await self.send_markdown_message(f"✅ 成功给予 {quantity} 个 {item_id} 给用户 {user_id}", chat_id, user_id)

__all__ = [
    "WPSBackpackSystem",
    "BackpackItemTier",
    "BackpackItemDefinition",
    "WPSItemDescription",
]