import io
import logging
import subprocess
import time
from datetime import datetime
from pathlib import Path

from backend.config import DOSSIER_PHOTOS, charger_config

log = logging.getLogger("photobooth.camera")

# Essayer d'importer gphoto2, sinon mode simulation
try:
    import gphoto2 as gp
    GPHOTO2_DISPONIBLE = True
except ImportError:
    GPHOTO2_DISPONIBLE = False
    log.warning("python-gphoto2 non installe, mode simulation active")


class Camera:
    """Controle de l'appareil DSLR via gphoto2."""

    def __init__(self):
        self.camera = None
        self.contexte = None
        self.connectee = False

    def connecter(self) -> bool:
        """Connecte l'appareil photo."""
        if not GPHOTO2_DISPONIBLE:
            log.info("Mode simulation : camera virtuelle connectee")
            self.connectee = True
            return True

        try:
            self.contexte = gp.Context()
            self.camera = gp.Camera()
            self.camera.init(self.contexte)
            self.connectee = True
            log.info("Camera DSLR connectee")
            return True
        except gp.GPhoto2Error as e:
            log.error(f"Erreur connexion camera : {e}")
            self.connectee = False
            return False

    def deconnecter(self):
        """Deconnecte l'appareil photo."""
        if self.camera and GPHOTO2_DISPONIBLE:
            try:
                self.camera.exit(self.contexte)
            except gp.GPhoto2Error:
                pass
        self.camera = None
        self.contexte = None
        self.connectee = False
        log.info("Camera deconnectee")

    def capturer(self) -> Path | None:
        """Capture une photo et retourne le chemin du fichier."""
        if not self.connectee:
            log.error("Camera non connectee")
            return None

        horodatage = datetime.now().strftime("%Y%m%d_%H%M%S_%f")
        nom_fichier = f"photo_{horodatage}.jpg"
        chemin_dest = DOSSIER_PHOTOS / nom_fichier

        if not GPHOTO2_DISPONIBLE:
            return self._capture_simulation(chemin_dest)

        try:
            chemin_camera = self.camera.capture(gp.GP_CAPTURE_IMAGE, self.contexte)
            fichier_camera = self.camera.file_get(
                chemin_camera.folder, chemin_camera.name, gp.GP_FILE_TYPE_NORMAL, self.contexte
            )
            fichier_camera.save(str(chemin_dest))
            log.info(f"Photo capturee : {chemin_dest}")
            return chemin_dest
        except gp.GPhoto2Error as e:
            log.error(f"Erreur capture : {e}")
            return None

    def preview(self) -> bytes | None:
        """Capture un apercu live (preview) en JPEG."""
        if not self.connectee:
            return None

        if not GPHOTO2_DISPONIBLE:
            return self._preview_simulation()

        try:
            fichier = self.camera.capture_preview(self.contexte)
            donnees = fichier.get_data_and_size()
            return bytes(donnees)
        except gp.GPhoto2Error as e:
            log.error(f"Erreur preview : {e}")
            return None

    def lister_appareils(self) -> list[str]:
        """Liste les appareils photo detectes."""
        if not GPHOTO2_DISPONIBLE:
            return ["[Simulation] Camera virtuelle"]

        try:
            appareils = gp.Camera.autodetect(self.contexte or gp.Context())
            return [f"{nom} ({port})" for nom, port in appareils]
        except gp.GPhoto2Error:
            return []

    def _capture_simulation(self, chemin: Path) -> Path:
        """Genere une image de test en mode simulation."""
        from PIL import Image, ImageDraw, ImageFont

        img = Image.new("RGB", (1920, 1280), color=(40, 40, 40))
        draw = ImageDraw.Draw(img)
        texte = f"SIMULATION\n{datetime.now().strftime('%H:%M:%S')}"
        draw.text((960, 640), texte, fill=(255, 255, 255), anchor="mm")
        # Dessiner un cadre
        draw.rectangle([50, 50, 1870, 1230], outline=(233, 30, 99), width=4)
        img.save(chemin, "JPEG", quality=95)
        log.info(f"Photo simulation : {chemin}")
        return chemin

    def _preview_simulation(self) -> bytes:
        """Genere un apercu de test en mode simulation."""
        from PIL import Image, ImageDraw

        img = Image.new("RGB", (640, 480), color=(30, 30, 30))
        draw = ImageDraw.Draw(img)
        draw.text((320, 240), "PREVIEW", fill=(200, 200, 200), anchor="mm")
        draw.ellipse([300, 220, 340, 260], outline=(233, 30, 99), width=2)
        buf = io.BytesIO()
        img.save(buf, "JPEG", quality=70)
        return buf.getvalue()


# Instance globale
camera = Camera()