from __future__ import annotations

import os
from dataclasses import dataclass
from typing import Any, Dict, Optional

import requests

from services.analysis_service import AnalysisService as AnalysisApi


@dataclass(frozen=True)
class ApiResult:
    ok: bool
    status_code: int
    data: Any = None
    error: Optional[str] = None


class ApiClient:
    def __init__(self, base_url: str, timeout_sec: float = 5.0) -> None:
        self.base_url = base_url.rstrip("/")
        self.timeout_sec = float(timeout_sec)
        self.session = requests.Session()

    def _url(self, path: str) -> str:
        if not path.startswith("/"):
            path = "/" + path
        return f"{self.base_url}{path}"

    def _request(self, method: str, path: str, **kwargs: Any) -> ApiResult:
        url = self._url(path)
        try:
            r = self.session.request(method=method, url=url, timeout=self.timeout_sec, **kwargs)
            sc = r.status_code
            r.raise_for_status()
            return ApiResult(ok=True, status_code=sc, data=(r.json() if r.content else None))
        except Exception as e:
            sc = getattr(getattr(e, "response", None), "status_code", 0)
            return ApiResult(ok=False, status_code=sc or 0, error=str(e))

    def get_json(self, path: str, params: Optional[Dict[str, Any]] = None) -> ApiResult:
        return self._request("GET", path, params=params)

    def post_json(self, path: str, payload: Dict[str, Any]) -> ApiResult:
        return self._request("POST", path, json=payload)

    def post_file(self, path: str, file_path: str, field_name: str = "file") -> ApiResult:
        try:
            with open(file_path, "rb") as f:
                files = {field_name: (os.path.basename(file_path), f)}
                return self._request("POST", path, files=files)
        except Exception as e:
            sc = getattr(getattr(e, "response", None), "status_code", 0)
            return ApiResult(ok=False, status_code=sc or 0, error=str(e))


class LoggedApiClient(ApiClient):
    def _full_url(self, endpoint: str) -> str:
        endpoint = endpoint if endpoint.startswith("/") else f"/{endpoint}"
        return f"{self.base_url}{endpoint}"

    def get_json(self, endpoint: str, params: Optional[dict] = None) -> ApiResult:
        print(f"[HTTP][GET] {self._full_url(endpoint)} params={params}")
        return super().get_json(endpoint, params=params)

    def post_json(self, endpoint: str, payload: dict) -> ApiResult:
        print(f"[HTTP][POST] {self._full_url(endpoint)} payload={payload}")
        return super().post_json(endpoint, payload)

    def post_file(self, endpoint: str, file_path: str, field_name: str = "file") -> ApiResult:
        if os.path.exists(file_path):
            size = os.path.getsize(file_path)
        else:
            size = -1
        print(f"[HTTP][UPLOAD] {self._full_url(endpoint)} file={file_path} size={size}")
        return super().post_file(endpoint, file_path, field_name)


class LoggedAnalysisApi:
    def __init__(self, base_url: str, timeout: float):
        self.base_url = base_url.rstrip("/")
        self.timeout = timeout

    def _api(self) -> AnalysisApi:
        return AnalysisApi(self.base_url, timeout=self.timeout)

    def upload(self, file_path: str) -> str:
        print(f"[ANALYSIS][POST] {self.base_url}/upload file={file_path}")
        return self._api().upload(file_path)

    def filter(self, session_id: str, dt: float, center: float, lo: float, hi: float, low: float) -> dict:
        print(f"[ANALYSIS][POST] {self.base_url}/filter sid={session_id}")
        return self._api().filter(session_id, dt, center, lo, hi, low)

    def fft(
        self,
        session_id: str,
        c1: Optional[int],
        c2: Optional[int],
        c3: Optional[int],
        c4: Optional[int],
    ) -> dict:
        print(f"[ANALYSIS][POST] {self.base_url}/fft sid={session_id} c=({c1},{c2},{c3},{c4})")
        return self._api().fft(session_id, c1=c1, c2=c2, c3=c3, c4=c4)

    def result(self, session_id: str) -> dict:
        print(f"[ANALYSIS][GET] {self.base_url}/result/{session_id}")
        return self._api().result(session_id)

    def export_plots(self, session_id: str) -> dict:
        print(f"[ANALYSIS][GET] {self.base_url}/export/{session_id}")
        return self._api().export_plots(session_id)

    def plot_raw(self, session_id: str) -> dict:
        print(f"[ANALYSIS][GET] {self.base_url}/plot-raw/{session_id}")
        return self._api().plot_raw(session_id)

    def export_raw_data(self, session_id: str) -> dict:
        print(f"[ANALYSIS][GET] {self.base_url}/export-raw-data/{session_id}")
        return self._api().export_raw_data(session_id)

    def export_filter_data(
        self,
        session_id: str,
        center_freq: float,
        lower_freq: float,
        higher_freq: float,
        low_freq: float,
    ) -> dict:
        print(f"[ANALYSIS][GET] {self.base_url}/export-filter-data/{session_id}")
        return self._api().export_filter_data(
            session_id,
            center_freq=center_freq,
            lower_freq=lower_freq,
            higher_freq=higher_freq,
            low_freq=low_freq,
        )

    def export_decdem_data(self, session_id: str) -> dict:
        print(f"[ANALYSIS][GET] {self.base_url}/export-decdem-data/{session_id}")
        return self._api().export_decdem_data(session_id)

    def export_position_freq(self, session_id: str) -> dict:
        print(f"[ANALYSIS][GET] {self.base_url}/export-position-freq/{session_id}")
        return self._api().export_position_freq(session_id)

    def export_fwhm(self, session_id: str) -> dict:
        print(f"[ANALYSIS][GET] {self.base_url}/export-fwhm/{session_id}")
        return self._api().export_fwhm(session_id)

    def export_max_amplitude_freq(self, session_id: str) -> dict:
        print(f"[ANALYSIS][GET] {self.base_url}/export-max-amplitude-freq/{session_id}")
        return self._api().export_max_amplitude_freq(session_id)

    def download_bytes(self, rel_url: str) -> bytes:
        url = f"{self.base_url.rstrip('/')}/{rel_url.lstrip('/')}"
        print(f"[ANALYSIS][GET-BYTES] {url}")
        r = requests.get(url, timeout=self.timeout)
        r.raise_for_status()
        return r.content


@dataclass
class AnalysisState:
    base_url: str
    session_id: str = ""
    last_uploaded_path: str = ""