# image.py
"""
Processing logic for shoplifting detection (single-image version).
Exposes process_image(...) generator which yields updates while processing.
Each yielded update is a dict with keys:
 - status: human string
 - live_frame: path to latest suspicious frame image (or "")
 - suspicious_list: list of saved suspicious image paths so far
 - csv_path: path to CSV log (updated)
 - annotated_image: path to annotated image (only on final yield)
"""

import os
import time
import csv
import json
import base64
import cv2
from ultralytics import YOLO

import logging

# basic logger for these modules
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

# Optional OpenRouter client - only used if key provided.
try:
    from openai import OpenAI
except Exception:
    OpenAI = None

def _ensure_dir(p):
    os.makedirs(p, exist_ok=True)

def send_email_with_attachment(smtp_cfg, subject, html_body, attachment_path=None, attachment_bytes=None, attachment_filename=None):
    """
    smtp_cfg: dict with smtp_server, smtp_port, email_user, email_pass, email_to, enabled
    Either attachment_path (str) or attachment_bytes (bytes) can be provided.
    If attachment_bytes provided and attachment_filename None -> uses 'attachment.jpg' as filename.
    Returns (success: bool, timestamp_str or error_str)
    """
    if not smtp_cfg or not smtp_cfg.get("enabled"):
        return False, "smtp_disabled"

    try:
        import smtplib
        from email.mime.multipart import MIMEMultipart
        from email.mime.text import MIMEText
        from email.mime.base import MIMEBase
        from email import encoders
        from email.utils import formatdate
        import mimetypes

        smtp_server = smtp_cfg.get("smtp_server")
        smtp_port = int(smtp_cfg.get("smtp_port", 587))
        email_user = smtp_cfg.get("email_user")
        email_pass = smtp_cfg.get("email_pass")
        email_to = smtp_cfg.get("email_to")

        if not (smtp_server and smtp_port and email_user and email_pass and email_to):
            logger.warning("Incomplete SMTP config — cannot send email.")
            return False, "incomplete_smtp_cfg"

        msg = MIMEMultipart()
        msg["From"] = email_user
        msg["To"] = email_to
        msg["Date"] = formatdate(localtime=True)
        msg["Subject"] = subject
        msg.attach(MIMEText(html_body, "html"))

        # prepare attachment
        if attachment_bytes is not None:
            filename = attachment_filename if attachment_filename else "attachment.jpg"
            ctype, encoding = mimetypes.guess_type(filename)
            maintype, subtype = (ctype.split("/", 1) if ctype else ("application", "octet-stream"))
            part = MIMEBase(maintype, subtype)
            part.set_payload(attachment_bytes)
            encoders.encode_base64(part)
            part.add_header("Content-Disposition", f'attachment; filename="{filename}"')
            msg.attach(part)
        elif attachment_path is not None:
            if not os.path.exists(attachment_path):
                logger.warning(f"Attachment path does not exist: {attachment_path}")
            else:
                with open(attachment_path, "rb") as f:
                    file_bytes = f.read()
                filename = attachment_filename if attachment_filename else os.path.basename(attachment_path)
                ctype, encoding = mimetypes.guess_type(filename)
                maintype, subtype = (ctype.split("/", 1) if ctype else ("application", "octet-stream"))
                part = MIMEBase(maintype, subtype)
                part.set_payload(file_bytes)
                encoders.encode_base64(part)
                part.add_header("Content-Disposition", f'attachment; filename="{filename}"')
                msg.attach(part)

        # connect and send
        if smtp_port == 465:
            server = smtplib.SMTP_SSL(smtp_server, smtp_port, timeout=20)
        else:
            server = smtplib.SMTP(smtp_server, smtp_port, timeout=20)
            server.ehlo()
            try:
                server.starttls()
            except Exception as e:
                logger.warning(f"starttls failed or not supported: {e}")

        server.login(email_user, email_pass)
        server.sendmail(email_user, [email_to], msg.as_string())
        server.quit()
        ts = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime())
        return True, ts

    except Exception as e:
        logger.exception("[EMAIL ERROR]")
        return False, str(e)


def analyze_with_gemini_if_enabled(openrouter_cfg, image_path, frame_idx, bbox, conf_val, out_dir, log_csv, source_path, smtp_cfg):
    """
    Same function as in video.py (adapted call param name source_path instead of video_path).
    Writes a single CSV row inside this function.
    CSV columns (order): id, timestamp, video_path, frame_idx, label, model_conf,
                        bbox, x1, y1, x2, y2, image_path, crop_path,
                        email_sent, email_timestamp, notes
    """
    api_summary = ""
    try:
        # if API disabled --> write a skipped row with minimal fields
        if not openrouter_cfg or not openrouter_cfg.get("api_key") or OpenAI is None:
            ts = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime())
            uid = f"frame_{frame_idx:06d}"
            bbox_str = ""
            x1 = y1 = x2 = y2 = ""
            row = [
                uid, ts, source_path, frame_idx, "shoplifting",
                f"{conf_val:.3f}" if conf_val is not None else "",
                bbox_str, x1, y1, x2, y2,
                image_path, "",  # crop_path empty
                "False", "",     # email_sent, email_timestamp
                "api_skipped"    # notes
            ]
            with open(log_csv, "a", newline="", encoding="utf-8") as f:
                writer = csv.writer(f)
                writer.writerow(row)
            return {"skipped": True}

        # --- call OpenAI/OpenRouter ---
        client = OpenAI(base_url=openrouter_cfg.get("base_url", "https://openrouter.ai/api/v1"),
                        api_key=openrouter_cfg["api_key"])

        with open(image_path, "rb") as f:
            b64 = base64.b64encode(f.read()).decode("utf-8")

        prompt_text = """
You are a visual analyst. Examine the image and answer with a concise JSON object.
Return EXACT JSON keys: theft, reason, suspect_description.
If theft detected use "Yes" else "No".
"""

        messages = [
            {"role": "user",
             "content": [
                 {"type": "text", "text": prompt_text},
                 {"type": "image_url", "image_url": {"url": f"data:image/jpeg;base64,{b64}"}}
             ]}
        ]

        completion = client.chat.completions.create(
            model=openrouter_cfg.get("model_name"),
            messages=messages
        )
        observation = completion.choices[0].message.content.strip()
        api_summary = observation.replace("\n", " ")

        api_json = {}
        try:
            start = observation.find("{")
            end = observation.rfind("}") + 1
            if start != -1 and end != -1:
                api_json = json.loads(observation[start:end])
            else:
                api_json = {"raw": observation}
        except Exception:
            api_json = {"raw": observation}

        api_theft = api_json.get("theft", "") if isinstance(api_json, dict) else ""
        api_reason = api_json.get("reason", "") if isinstance(api_json, dict) else ""
        api_suspect = api_json.get("suspect_description", "") if isinstance(api_json, dict) else ""

        crop_path = ""
        email_sent = False
        email_ts = ""
        # if theft yes -> crop and maybe send email
        if api_theft and str(api_theft).lower() == "yes":
            if bbox:
                x1i, y1i, x2i, y2i = bbox
                # read the frame bytes (if image_path is bytes path or actual path)
                frame = None
                try:
                    frame = cv2.imread(image_path)
                except Exception:
                    frame = None
                if frame is not None and x2i > x1i and y2i > y1i:
                    crop = frame[y1i:y2i, x1i:x2i]
                    ok, crop_buf = cv2.imencode('.jpg', crop)
                    if ok:
                        crop_bytes = crop_buf.tobytes()
                        # optionally save a copy on disk (non-mandatory); keep original behavior but guarded
                        try:
                            crop_path = os.path.join(out_dir, f"crop_{frame_idx}.jpg")
                            with open(crop_path, "wb") as cf:
                                cf.write(crop_bytes)
                        except Exception:
                            # ignore write failure; we will still attempt to email the bytes
                            crop_path = ""
        
                        details_html = "<ul>"
                        if api_reason:
                            details_html += f"<li><b>Reason:</b> {api_reason}</li>"
                        if api_suspect:
                            details_html += f"<li><b>Suspect:</b> {api_suspect}</li>"
                        details_html += "</ul>"
                        html_body = f"""
                        <html><body>
                        <h3>⚠ Alert - Suspicious activity detected</h3>
                        {details_html}
                        <p>Frame index: {frame_idx} | Confidence: {conf_val:.3f}</p>
                        </body></html>
                        """
                        if smtp_cfg and smtp_cfg.get("enabled"):
                            success, info = send_email_with_attachment(
                                smtp_cfg,
                                "Shoplifting Alert",
                                html_body,
                                attachment_bytes=crop_bytes,
                                attachment_filename=f"crop_{frame_idx}.jpg"
                            )
                            if success:
                                email_sent = True
                                email_ts = info  # timestamp

        # prepare bbox strings / coords for CSV
        ts = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime())
        uid = f"frame_{frame_idx:06d}"
        bbox_str = ""
        x1 = y1 = x2 = y2 = ""
        if bbox:
            try:
                x1_val, y1_val, x2_val, y2_val = bbox
                x1 = int(x1_val); y1 = int(y1_val); x2 = int(x2_val); y2 = int(y2_val)
                bbox_str = f"{x1},{y1},{x2},{y2}"
            except Exception:
                bbox_str = ""
                x1 = y1 = x2 = y2 = ""

        # notes: keep compact API summary or theft/reason short note
        notes = ""
        if api_summary:
            notes = api_summary
        else:
            # fallback short note
            if api_theft:
                notes = f"theft:{api_theft} reason:{api_reason}"
            else:
                notes = ""

        row = [
            uid, ts, source_path, frame_idx, "shoplifting",
            f"{conf_val:.3f}" if conf_val is not None else "",
            bbox_str, x1, y1, x2, y2,
            image_path, crop_path,
            str(email_sent), email_ts,
            notes
        ]
        with open(log_csv, "a", newline="", encoding="utf-8") as f:
            writer = csv.writer(f)
            writer.writerow(row)

        return api_json

    except Exception as e:
        print("[API ERROR]", e)
        ts = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime())
        uid = f"frame_{frame_idx:06d}"
        bbox_str = ""
        x1 = y1 = x2 = y2 = ""
        try:
            if bbox:
                x1v, y1v, x2v, y2v = bbox
                x1 = x1v; y1 = y1v; x2 = x2v; y2 = y2v
                bbox_str = f"{x1},{y1},{x2},{y2}"
        except:
            pass

        row = [
            uid, ts, source_path, frame_idx, "shoplifting",
            f"{conf_val:.3f}" if conf_val is not None else "",
            bbox_str, x1, y1, x2, y2,
            image_path, "",  # no crop
            "False", "",      # email_sent, email_timestamp
            f"api_error: {e}"
        ]
        try:
            with open(log_csv, "a", newline="", encoding="utf-8") as f:
                writer = csv.writer(f)
                writer.writerow(row)
        except Exception as e2:
            print("[CSV WRITE ERROR]", e2)
        return {"error": str(e)}


def process_image(
    image_path,
    model_path,
    out_root,
    openrouter_cfg=None,
    smtp_cfg=None,
    conf_thresh=0.5,
    confirm_conf_thresh=0.7
):
    """
    Generator that yields updates during processing of a single image.
    Yields dicts with keys: status, live_frame, suspicious_list, csv_path, annotated_image (only final)
    """
    _ensure_dir(out_root)
    suspicious_dir = os.path.join(out_root, "suspicious_images")
    _ensure_dir(suspicious_dir)

    csv_path = os.path.join(suspicious_dir, "suspicious_log.csv")
    CSV_HEADER = [
        "id", "timestamp", "video_path", "frame_idx", "label", "model_conf",
        "bbox", "x1", "y1", "x2", "y2", "image_path", "crop_path",
        "email_sent", "email_timestamp", "notes"
    ]

    # create CSV header
    with open(csv_path, "w", newline="", encoding="utf-8") as f:
        w = csv.writer(f)
        w.writerow(CSV_HEADER)

    # load model
    yield {"status": "Loading model...", "live_frame": "", "suspicious_list": [], "csv_path": csv_path}
    model = YOLO(model_path)

    # pick device
    device = "cpu"
    try:
        import torch
        device = 0 if torch.cuda.is_available() else "cpu"
    except Exception:
        device = "cpu"

    # read image
    if not os.path.exists(image_path):
        yield {"status": f"ERROR: Cannot open image {image_path}", "live_frame": "", "suspicious_list": [], "csv_path": csv_path}
        return

    frame_bgr = cv2.imread(image_path)
    if frame_bgr is None:
        yield {"status": f"ERROR: Failed to read image {image_path}", "live_frame": "", "suspicious_list": [], "csv_path": csv_path}
        return
    frame_rgb = cv2.cvtColor(frame_bgr, cv2.COLOR_BGR2RGB).copy()

    yield {"status": "Starting inference on image...", "live_frame": "", "suspicious_list": [], "csv_path": csv_path}

    # run prediction (non-stream)
    results = model.predict(source=image_path, device=device, conf=conf_thresh)

    annotated = frame_bgr.copy()
    suspicious_saved = []
    last_live = ""
    detection_idx = 0
    found_any = False

    # results is a list (one element per image)
    for r in results:
        boxes, confs, cls_idx = [], [], []
        if hasattr(r, "boxes") and r.boxes is not None:
            try:
                boxes = r.boxes.xyxy.cpu().numpy().tolist()
                confs = r.boxes.conf.cpu().numpy().tolist()
                cls_idx = r.boxes.cls.cpu().numpy().astype(int).tolist()
            except Exception:
                try:
                    boxes = r.boxes.xyxy.tolist()
                    confs = r.boxes.conf.tolist()
                    cls_idx = [int(x) for x in getattr(r.boxes, "cls", [])] if getattr(r.boxes, "cls", None) is not None else []
                except Exception:
                    boxes, confs, cls_idx = [], [], []

        highest_conf = 0.0
        chosen_bbox = None

        for i, box in enumerate(boxes):
            conf = confs[i] if i < len(confs) else 0.0
            cid = cls_idx[i] if i < len(cls_idx) else None
            label = str(cid) if cid is not None else "obj"
            try:
                if isinstance(model.names, dict):
                    label = model.names.get(cid, str(cid))
                else:
                    label = model.names[cid]
            except Exception:
                pass

            if conf < conf_thresh:
                continue

            x1, y1, x2, y2 = [int(round(float(v))) for v in box[:4]]

            color = (0, 255, 0)
            if label.strip().lower() == "shoplifting":
                color = (0, 0, 255)
                if conf >= confirm_conf_thresh and conf > highest_conf:
                    highest_conf = conf
                    chosen_bbox = (x1, y1, x2, y2)

            # draw on annotated image
            cv2.rectangle(annotated, (x1, y1), (x2, y2), color, 2)
            label_text = f"{label} {conf:.2f}"
            cv2.putText(annotated, label_text, (x1, max(15, y1 - 5)), cv2.FONT_HERSHEY_SIMPLEX, 0.6, color, 2, cv2.LINE_AA)

            # if this detection qualifies as suspicious (confirmed)
            if label.strip().lower() == "shoplifting" and conf >= confirm_conf_thresh:
                found_any = True
                saved_name = f"img_{detection_idx:03d}_{int(time.time())}.jpg"
                saved_path = os.path.join(suspicious_dir, saved_name)
                # save the full annotated frame as suspicious saved (keeps parity with video flow)
                cv2.imwrite(saved_path, annotated)
                suspicious_saved.append(saved_path)
                last_live = saved_path

                # call API & maybe send email (synchronously)
                analyze_with_gemini_if_enabled(openrouter_cfg, saved_path, detection_idx, (x1, y1, x2, y2),
                                               conf, suspicious_dir, csv_path, image_path, smtp_cfg)

                # yield an update for this detection
                yield {"status": f"Suspicious detection saved: {os.path.basename(saved_path)} (det {detection_idx})",
                       "live_frame": last_live,
                       "suspicious_list": suspicious_saved.copy(),
                       "csv_path": csv_path}

                detection_idx += 1

        # end boxes loop

    # write final annotated image
    annotated_image_path = os.path.join(out_root, f"annotated_{int(time.time())}.jpg")
    cv2.imwrite(annotated_image_path, annotated)

    # if no suspicious detections found, still write a CSV row to note scan (optional)
    if not found_any:
        # write a "no suspicious" row to CSV for traceability
        ts = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime())
        uid = "no_suspicious_000000"
        row = [
            uid, ts, image_path, 0, "none", "",
            "", "", "", "", "",
            image_path, "",  # no crop
            "False", "",      # email_sent, email_timestamp
            "no_suspicious_detections"
        ]
        with open(csv_path, "a", newline="", encoding="utf-8") as f:
            writer = csv.writer(f)
            writer.writerow(row)

        yield {"status": "No suspicious detections found.", "live_frame": last_live, "suspicious_list": suspicious_saved.copy(), "csv_path": csv_path}

    # final yield with annotated image path
    yield {"status": "Finished processing image.", "live_frame": last_live, "suspicious_list": suspicious_saved.copy(), "csv_path": csv_path, "annotated_image": annotated_image_path}