"""配置数据模型：Provider、AppConfig。

向后兼容原 Netlify 版字段名（驼峰与下划线都接受）。
"""
from __future__ import annotations

from datetime import datetime, timezone
from typing import Any, List, Literal, Optional

from pydantic import BaseModel, Field, model_validator


def _split_key_list(value: Any) -> List[str]:
    if not value:
        return []
    if isinstance(value, list):
        out = []
        for item in value:
            s = str(item or "").strip()
            if s:
                out.append(s)
        return list(dict.fromkeys(out))
    out = []
    for item in str(value).replace("\n", ",").replace(";", ",").split(","):
        s = item.strip()
        if s:
            out.append(s)
    return list(dict.fromkeys(out))


class Provider(BaseModel):
    """单个上游厂商配置。"""

    id: str
    name: str = ""
    type: Literal["gemini", "openai"] = "gemini"
    base_url: Optional[str] = None
    api_keys: List[str] = Field(default_factory=list)
    api_key: Optional[str] = None  # 兼容字段，等价于 api_keys[0]
    model_prefix: str = ""
    enabled: bool = True
    model_policy_mode: Literal["allowlist", "denylist"] = "denylist"
    allow_models: List[str] = Field(default_factory=list)
    deny_models: List[str] = Field(default_factory=list)

    model_config = {"extra": "ignore"}

    @model_validator(mode="before")
    @classmethod
    def _normalize(cls, data: Any) -> Any:
        if not isinstance(data, dict):
            return data
        # 兼容 alias
        out = dict(data)
        if "baseUrl" in out and "base_url" not in out:
            out["base_url"] = out.pop("baseUrl")
        if "modelPrefix" in out and "model_prefix" not in out:
            out["model_prefix"] = out.pop("modelPrefix")
        if "modelPolicyMode" in out and "model_policy_mode" not in out:
            out["model_policy_mode"] = out.pop("modelPolicyMode")
        if "allowModels" in out and "allow_models" not in out:
            out["allow_models"] = out.pop("allowModels")
        if "denyModels" in out and "deny_models" not in out:
            out["deny_models"] = out.pop("denyModels")
        # enabled_models / disabled_models 别名
        if "enabledModels" in out and "allow_models" not in out:
            out["allow_models"] = out.pop("enabledModels")
        if "disabledModels" in out and "deny_models" not in out:
            out["deny_models"] = out.pop("disabledModels")
        # id 默认从 name
        if not out.get("id"):
            out["id"] = str(out.get("name") or "").strip()
        # 名称默认从 id
        if not out.get("name"):
            out["name"] = str(out.get("id") or "").strip()
        # apiKeys / api_keys / apiKey 合并去重（兼容多种命名）
        keys = _split_key_list(out.get("api_keys"))
        keys += _split_key_list(out.get("apiKeys"))
        keys += _split_key_list(out.get("api_key"))
        keys += _split_key_list(out.get("apiKey"))
        out["api_keys"] = list(dict.fromkeys(keys))
        out["api_key"] = out["api_keys"][0] if out["api_keys"] else None
        # base_url 兜底
        if not out.get("base_url"):
            ptype = str(out.get("type") or "").lower()
            out["base_url"] = None if ptype == "gemini" else "https://api.openai.com"
        else:
            out["base_url"] = str(out["base_url"]).rstrip("/")
        return out

    def masked(self) -> "Provider":
        """返回脱敏副本（用于后台展示，密钥只显示首尾）。"""
        def mask(k: str) -> str:
            k = str(k or "")
            return f"{k[:6]}***{k[-4:]}" if len(k) > 10 else "***"
        return Provider(
            id=self.id,
            name=self.name,
            type=self.type,
            base_url=self.base_url,
            api_keys=[mask(k) for k in self.api_keys],
            api_key=mask(self.api_key) if self.api_key else None,
            model_prefix=self.model_prefix,
            enabled=self.enabled,
            model_policy_mode=self.model_policy_mode,
            allow_models=list(self.allow_models),
            deny_models=list(self.deny_models),
        )

    def public(self) -> dict:
        """返回给手表端 /v1/xtc/providers 的精简信息。"""
        return {
            "id": self.id,
            "name": self.name,
            "type": self.type,
            "modelPrefix": self.model_prefix or "",
        }


class AppConfig(BaseModel):
    """完整配置（厂商列表 + 默认厂商 + 更新时间）。"""

    providers: List[Provider] = Field(default_factory=list)
    default_provider_id: Optional[str] = None
    updated_at: Optional[str] = None

    model_config = {"extra": "ignore"}

    @model_validator(mode="before")
    @classmethod
    def _normalize(cls, data: Any) -> Any:
        if not isinstance(data, dict):
            return data
        out = dict(data)
        if "defaultProviderId" in out and "default_provider_id" not in out:
            out["default_provider_id"] = out.pop("defaultProviderId")
        if "updatedAt" in out and "updated_at" not in out:
            out["updated_at"] = out.pop("updatedAt")
        return out

    def normalize(self) -> "AppConfig":
        """确保 default_provider_id 指向启用的厂商。"""
        enabled = [p for p in self.providers if p.enabled]
        if self.default_provider_id and any(p.id == self.default_provider_id for p in enabled):
            return self
        self.default_provider_id = enabled[0].id if enabled else None
        self.updated_at = datetime.now(timezone.utc).isoformat()
        return self

    def find_provider(self, provider_id: Optional[str], *, enabled_only: bool = True) -> Optional[Provider]:
        if not provider_id:
            return None
        for p in self.providers:
            if p.id == provider_id and (not enabled_only or p.enabled):
                return p
        return None

    def find_default_provider(self) -> Optional[Provider]:
        if self.default_provider_id:
            p = self.find_provider(self.default_provider_id)
            if p:
                return p
        for p in self.providers:
            if p.enabled:
                return p
        return None