"""
Flare – ConfigProvider (şifreli cloud_token desteği)
"""

from __future__ import annotations
import json, os
from pathlib import Path
from typing import Any, Dict, List, Optional

from pydantic import BaseModel, Field, HttpUrl, ValidationError
from utils import log
from encryption_utils import decrypt

class GlobalConfig(BaseModel):
    work_mode: str = Field("hfcloud", pattern=r"^(hfcloud|cloud|on-premise)$")
    cloud_token: Optional[str] = None
    spark_endpoint: HttpUrl
    users: List["UserConfig"] = []

    def get_plain_token(self) -> Optional[str]:
        return decrypt(self.cloud_token) if self.cloud_token else None

# ---------------- Global -----------------
class UserConfig(BaseModel):
    username: str
    password_hash: str
    salt: str


# ---------------- Retry / Proxy ----------
class RetryConfig(BaseModel):
    retry_count: int = Field(3, alias="max_attempts")
    backoff_seconds: int = 2
    strategy: str = Field("static", pattern=r"^(static|exponential)$")


class ProxyConfig(BaseModel):
    enabled: bool = True
    url: HttpUrl


# ---------------- API & Auth -------------
class APIAuthConfig(BaseModel):
    enabled: bool = False
    token_endpoint: Optional[HttpUrl] = None
    response_token_path: str = "access_token"
    token_request_body: Dict[str, Any] = Field({}, alias="body_template")
    token_refresh_endpoint: Optional[HttpUrl] = None
    token_refresh_body: Dict[str, Any] = {}

    class Config:
        extra = "allow"


class APIConfig(BaseModel):
    name: str
    url: HttpUrl
    method: str = Field("GET", pattern=r"^(GET|POST|PUT|PATCH|DELETE)$")
    headers: Dict[str, Any] = {}
    body_template: Dict[str, Any] = {}
    timeout_seconds: int = 10
    retry: RetryConfig = RetryConfig()
    proxy: Optional[str | ProxyConfig] = None
    auth: Optional[APIAuthConfig] = None
    response_prompt: Optional[str] = None

    class Config:
        extra = "allow"


# ---------------- Intent / Param ---------
class ParameterConfig(BaseModel):
    name: str
    caption: Optional[str] = ""
    type: str = Field(..., pattern=r"^(int|float|bool|str|string)$")
    required: bool = True
    extraction_prompt: Optional[str] = None
    validation_regex: Optional[str] = None
    invalid_prompt: Optional[str] = None
    type_error_prompt: Optional[str] = None

    def canonical_type(self) -> str:
        return "str" if self.type == "string" else self.type


class IntentConfig(BaseModel):
    name: str
    caption: Optional[str] = ""
    locale: str = "tr-TR"
    dependencies: List[str] = []
    examples: List[str] = []
    detection_prompt: Optional[str] = None
    parameters: List[ParameterConfig] = []
    action: str
    fallback_timeout_prompt: Optional[str] = None
    fallback_error_prompt: Optional[str] = None

    class Config:
        extra = "allow"


# ---------------- Version / Project ------
class LLMConfig(BaseModel):
    repo_id: str
    generation_config: Dict[str, Any] = {}
    use_fine_tune: bool = False
    fine_tune_zip: str = ""


class VersionConfig(BaseModel):
    id: int = Field(..., alias="version_number")
    caption: Optional[str] = ""
    published: bool = False
    general_prompt: str
    llm: "LLMConfig"
    intents: List["IntentConfig"]

    class Config:
        extra = "allow"
        populate_by_name = True


class ProjectConfig(BaseModel):
    id: Optional[int] = None
    name: str
    caption: Optional[str] = ""
    enabled: bool = True
    last_version_number: Optional[int] = None
    versions: List[VersionConfig]

    class Config:
        extra = "allow"


# ---------------- Service Config ---------
class ServiceConfig(BaseModel):
    global_config: GlobalConfig = Field(..., alias="config")
    projects: List[ProjectConfig]
    apis: List[APIConfig]

    # runtime helpers (skip validation)
    _api_by_name: Dict[str, APIConfig] = {}

    def build_index(self):
        self._api_by_name = {a.name: a for a in self.apis}

    def get_api(self, name: str) -> APIConfig | None:
        return self._api_by_name.get(name)


# ---------------- Provider Singleton -----
class ConfigProvider:
    _instance: Optional[ServiceConfig] = None
    _CONFIG_PATH = Path(__file__).parent / "service_config.jsonc"

    @classmethod
    def get(cls) -> ServiceConfig:
        if cls._instance is None:
            cls._instance = cls._load()
            cls._instance.build_index()
        return cls._instance

    # -------- Internal helpers ------------
    @classmethod
    def _load(cls) -> ServiceConfig:
        log(f"📥 Loading service config from {cls._CONFIG_PATH.name} …")
        raw = cls._CONFIG_PATH.read_text(encoding="utf-8")
        json_str = cls._strip_jsonc(raw)
        try:
            data = json.loads(json_str)
            cfg = ServiceConfig.model_validate(data)
            log("✅ Service config loaded.")
            return cfg
        except (json.JSONDecodeError, ValidationError) as exc:
            log(f"❌ Config validation error: {exc}")
            raise

    @staticmethod
    def _strip_jsonc(text: str) -> str:
        """Remove // and /* */ comments (string-aware)."""
        OUT, STR, ESC, SLASH, BLOCK = 0, 1, 2, 3, 4
        state, res, i = OUT, [], 0
        while i < len(text):
            ch = text[i]
            if state == OUT:
                if ch == '"':
                    state, res = STR, res + [ch]
                elif ch == '/':
                    nxt = text[i + 1] if i + 1 < len(text) else ""
                    if nxt == '/':
                        state, i = SLASH, i + 1
                    elif nxt == '*':
                        state, i = BLOCK, i + 1
                    else:
                        res.append(ch)
                else:
                    res.append(ch)
            elif state == STR:
                res.append(ch)
                state = ESC if ch == '\\' else (OUT if ch == '"' else STR)
            elif state == ESC:
                res.append(ch)
                state = STR
            elif state == SLASH:
                if ch == '\n':
                    res.append(ch)
                    state = OUT
            elif state == BLOCK:
                if ch == '*' and i + 1 < len(text) and text[i + 1] == '/':
                    i, state = i + 1, OUT
            i += 1
        return ''.join(res)