# api_client.py  (UI - Space "veureu")

import os
import io
import base64
import zipfile
import requests
from typing import Iterable, Dict, Any


class APIClient:
    """
    High-level client for communicating with the Veureu Engine API.

    Endpoints managed:
        POST /jobs
            → {"job_id": "..."}

        GET /jobs/{job_id}/status
            → {"status": "queued|processing|done|failed", ...}

        GET /jobs/{job_id}/result
            → JobResult such as {"book": {...}, "une": {...}, ...}

    This class is used by the Streamlit UI to submit videos, poll job status,
    retrieve results, generate audio, and interact with the TTS and casting services.
    """

    def __init__(
        self,
        base_url: str,
        use_mock: bool = False,
        data_dir: str | None = None,
        token: str | None = None,
        timeout: int = 180
    ):
        """
        Initialize the API client.

        Args:
            base_url: Base URL of the engine or TTS service.
            use_mock: Whether to respond with mock data instead of real API calls.
            data_dir: Optional data folder for local mock/test files.
            token: Authentication token (fallback: API_SHARED_TOKEN env var).
            timeout: Timeout in seconds for requests.
        """
        self.base_url = base_url.rstrip("/")
        self.tts_url = self.base_url  # For HF Spaces, TTS lives at same base URL
        self.use_mock = use_mock
        self.data_dir = data_dir
        self.timeout = timeout
        self.session = requests.Session()

        # Authorization header if token provided
        token = token or os.getenv("API_SHARED_TOKEN")
        if token:
            self.session.headers.update({"Authorization": f"Bearer {token}"})


    # -------------------------------------------------------------------------
    # Internal engine calls
    # -------------------------------------------------------------------------

    def _post_jobs(self, video_path: str, modes: Iterable[str]) -> Dict[str, Any]:
        """Submit a video and processing modes to /jobs."""
        url = f"{self.base_url}/jobs"
        files = {
            "file": (os.path.basename(video_path), open(video_path, "rb"), "application/octet-stream")
        }
        data = {"modes": ",".join(modes)}

        r = self.session.post(url, files=files, data=data, timeout=self.timeout)
        r.raise_for_status()
        return r.json()

    def _get_status(self, job_id: str) -> Dict[str, Any]:
        """Query job status."""
        url = f"{self.base_url}/jobs/{job_id}/status"
        r = self.session.get(url, timeout=self.timeout)
        r.raise_for_status()
        return r.json()

    def _get_result(self, job_id: str) -> Dict[str, Any]:
        """Retrieve job result."""
        url = f"{self.base_url}/jobs/{job_id}/result"
        r = self.session.get(url, timeout=self.timeout)
        r.raise_for_status()
        return r.json()


    # -------------------------------------------------------------------------
    # Public API used by streamlit_app.py
    # -------------------------------------------------------------------------

    def process_video(self, video_path: str, modes: Iterable[str]) -> Dict[str, Any]:
        """Return {"job_id": "..."} either from mock or engine."""
        if self.use_mock:
            return {"job_id": "mock-123"}
        return self._post_jobs(video_path, modes)

    def get_job(self, job_id: str) -> Dict[str, Any]:
        """
        Returns UI-friendly job data:
            {"status": "done", "results": {"book": {...}, "une": {...}}}

        Maps engine responses into the expected 'results' format.
        """
        if self.use_mock:
            return {
                "status": "done",
                "results": {
                    "book": {"text": "Example text (book)", "mp3_bytes": b""},
                    "une": {
                        "srt": "1\n00:00:00,000 --> 00:00:01,000\nExample UNE\n",
                        "mp3_bytes": b""
                    }
                }
            }

        status_data = self._get_status(job_id)

        # If still processing, return minimal structure
        if status_data.get("status") in {"queued", "processing"}:
            return {"status": status_data.get("status", "queued")}

        raw_result = self._get_result(job_id)
        results = {}

        # Direct mapping of book/une sections
        if "book" in raw_result:
            results["book"] = {"text": raw_result["book"].get("text")}
        if "une" in raw_result:
            results["une"] = {"srt": raw_result["une"].get("srt")}

        # Preserve characters/metrics if present
        for section in ("book", "une"):
            if section in raw_result:
                if "characters" in raw_result[section]:
                    results[section]["characters"] = raw_result[section]["characters"]
                if "metrics" in raw_result[section]:
                    results[section]["metrics"] = raw_result[section]["metrics"]

        final_status = "done" if results else status_data.get("status", "unknown")
        return {"status": final_status, "results": results}


    # -------------------------------------------------------------------------
    # TTS Services
    # -------------------------------------------------------------------------

    def tts_matxa(self, text: str, voice: str = "central/grau") -> dict:
        """
        Call the TTS /tts/text endpoint to synthesize short audio.

        Returns:
            {"mp3_bytes": b"..."} on success
            {"error": "..."} on failure
        """
        if not self.tts_url:
            raise ValueError("TTS service URL not configured.")

        url = f"{self.tts_url.rstrip('/')}/tts/text"
        data = {"texto": text, "voice": voice, "formato": "mp3"}

        try:
            r = requests.post(url, data=data, timeout=self.timeout)
            r.raise_for_status()
            return {"mp3_bytes": r.content}
        except requests.exceptions.RequestException as e:
            return {"error": str(e)}

    def rebuild_video_with_ad(self, video_path: str, srt_path: str) -> dict:
        """
        Rebuild a video including audio description (AD)
        by calling /tts/srt. The server returns a ZIP containing an MP4.
        """
        if not self.tts_url:
            raise ValueError("TTS service URL not configured.")

        url = f"{self.tts_url.rstrip('/')}/tts/srt"

        try:
            files = {
                "video": (os.path.basename(video_path), open(video_path, "rb"), "video/mp4"),
                "srt": (os.path.basename(srt_path), open(srt_path, "rb"), "application/x-subrip")
            }
            data = {"include_final_mp4": 1}

            r = requests.post(url, files=files, data=data, timeout=self.timeout * 5)
            r.raise_for_status()

            with zipfile.ZipFile(io.BytesIO(r.content)) as z:
                for name in z.namelist():
                    if name.endswith(".mp4"):
                        return {"video_bytes": z.read(name)}

            return {"error": "MP4 file not found inside ZIP."}

        except zipfile.BadZipFile:
            return {"error": "Invalid ZIP response from server."}
        except requests.exceptions.RequestException as e:
            return {"error": str(e)}


    # -------------------------------------------------------------------------
    # Engine casting services
    # -------------------------------------------------------------------------

    def create_initial_casting(
        self,
        video_path: str = None,
        video_bytes: bytes = None,
        video_name: str = None,
        epsilon: float = 0.5,
        min_cluster_size: int = 2
    ) -> dict:
        """
        Calls /create_initial_casting to produce the initial actor/face clustering.

        Args:
            video_path: Load video from disk.
            video_bytes: Provide video already in memory.
            video_name: Name used if video_bytes is provided.
            epsilon: DBSCAN epsilon for clustering.
            min_cluster_size: Minimum number of samples for DBSCAN.
        """
        url = f"{self.base_url}/create_initial_casting"

        try:
            # Prepare video input
            if video_bytes:
                files = {"video": (video_name or "video.mp4", video_bytes, "video/mp4")}
            elif video_path:
                with open(video_path, "rb") as f:
                    files = {"video": (os.path.basename(video_path), f.read(), "video/mp4")}
            else:
                return {"error": "Either video_path or video_bytes must be provided."}

            data = {
                "epsilon": str(epsilon),
                "min_cluster_size": str(min_cluster_size)
            }

            r = self.session.post(url, files=files, data=data, timeout=self.timeout * 5)
            r.raise_for_status()

            if r.headers.get("content-type", "").startswith("application/json"):
                return r.json()

            return {"ok": True}

        except Exception as e:
            return {"error": str(e)}


    # -------------------------------------------------------------------------
    # Long text TTS helpers
    # -------------------------------------------------------------------------

    def generate_audio_from_text_file(self, text_content: str, voice: str = "central/grau") -> dict:
        """
        Converts a large text into an SRT-like structure, calls /tts/srt,
        and extracts 'ad_master.mp3' from the resulting ZIP.

        Useful for audiobook-like generation.
        """
        if not self.tts_url:
            raise ValueError("TTS service URL not configured.")

        # Build synthetic SRT in memory
        srt_content = ""
        start = 0

        for idx, raw_line in enumerate(text_content.strip().split("\n")):
            line = raw_line.strip()
            if not line:
                continue

            end = start + 5  # simplistic 5 seconds per subtitle

            def fmt(seconds):
                h = seconds // 3600
                m = (seconds % 3600) // 60
                s = seconds % 60
                return f"{h:02d}:{m:02d}:{s:02d},000"

            srt_content += f"{idx+1}\n"
            srt_content += f"{fmt(start)} --> {fmt(end)}\n"
            srt_content += f"{line}\n\n"
            start = end

        if not srt_content:
            return {"error": "Provided text is empty or cannot be processed."}

        # Call server
        url = f"{self.tts_url.rstrip('/')}/tts/srt"

        try:
            files = {"srt": ("fake_ad.srt", srt_content, "application/x-subrip")}
            data = {"voice": voice, "ad_format": "mp3"}

            r = requests.post(url, files=files, data=data, timeout=self.timeout * 5)
            r.raise_for_status()

            with zipfile.ZipFile(io.BytesIO(r.content)) as z:
                if "ad_master.mp3" in z.namelist():
                    return {"mp3_bytes": z.read("ad_master.mp3")}

            return {"error": "'ad_master.mp3' not found inside ZIP."}

        except requests.exceptions.RequestException as e:
            return {"error": f"Error calling SRT API: {e}"}
        except zipfile.BadZipFile:
            return {"error": "Invalid ZIP response from server."}

    def tts_long_text(self, text: str, voice: str = "central/grau") -> dict:
        """
        Call /tts/text_long for very long text TTS synthesis.
        Returns raw MP3 bytes.
        """
        if not self.tts_url:
            raise ValueError("TTS service URL not configured.")

        url = f"{self.tts_url.rstrip('/')}/tts/text_long"
        data = {"texto": text, "voice": voice, "formato": "mp3"}

        try:
            r = requests.post(url, data=data, timeout=self.timeout * 10)
            r.raise_for_status()
            return {"mp3_bytes": r.content}
        except requests.exceptions.RequestException as e:
            return {"error": str(e)}