import base64
import os
import uuid
from datetime import datetime
from io import BytesIO

import numpy as np
from datasets import load_dataset
from dotenv import load_dotenv
from PIL import Image
from qdrant_client import QdrantClient, models

from .embedding_utils import ColPaliEmbeddingGenerator

load_dotenv()

repo_id = "mahimairaja/ibm-hls-burn-original"
ds_from_hub = load_dataset(repo_id)

collection_name = "hls_burn_scars_data_colpali"

generator = ColPaliEmbeddingGenerator()


def image_to_base64(image):
    """Converts a PIL Image to a base64 string."""
    buffered = BytesIO()
    image.save(buffered, format="PNG")
    return base64.b64encode(buffered.getvalue()).decode("utf-8")


def generate_qdrant_points(dataset_split):
    points = []

    images_to_process = []
    items_to_process = []

    for i, item in enumerate(dataset_split):
        try:
            red = item["red"]
            green = item["green"]
            blue = item["blue"]

            def normalize_band(band):
                band = np.array(band, dtype=np.float32)
                if band.max() <= 1.0:
                    band = band * 255.0
                return band.astype(np.uint8)

            r_img = normalize_band(red)
            g_img = normalize_band(green)
            b_img = normalize_band(blue)

            rgb_array = np.stack([r_img, g_img, b_img], axis=2)
            image = Image.fromarray(rgb_array)

            images_to_process.append(image)
            items_to_process.append(item)

        except Exception as e:
            print(f"Skipping item {i} due to error preparing image: {e}")
            continue

    if not images_to_process:
        return []

    try:
        embeddings_batch = generator.generate_image_embeddings(images_to_process)
    except Exception as e:
        print(f"Error generating embeddings: {e}")
        return []

    for item, image, embedding in zip(
        items_to_process, images_to_process, embeddings_batch
    ):
        try:
            burn_area = item.get("burn_area", 0.0)

            annotation = item["annotation"]
            if isinstance(annotation, np.ndarray):
                annotation = Image.fromarray(annotation)

            image_b64 = image_to_base64(annotation)
            rgb_image_b64 = image_to_base64(image)

            point_id = str(uuid.uuid4())

            point = models.PointStruct(
                id=point_id,
                vector={
                    "colpali": embedding,
                },
                payload={
                    "centroid_lat": float(item["latitude"]),
                    "centroid_lon": float(item["longitude"]),
                    "acquisition_date": datetime.strptime(
                        item["date"], "%Y-%m-%dT%H:%M:%SZ"
                    ),
                    "burn_area": float(burn_area),
                    "image_base64": image_b64,
                    "rgb_image_base64": rgb_image_b64,
                },
            )
            points.append(point)
        except Exception as e:
            print(f"Error creating point: {e}")
            continue

    return points


def main():
    client = QdrantClient(
        url=os.getenv("QDRANT_URL"),
        api_key=os.getenv("QDRANT_API_KEY"),
    )

    if client.collection_exists(collection_name=collection_name):
        client.delete_collection(collection_name=collection_name)

    client.create_collection(
        collection_name=collection_name,
        vectors_config={
            "colpali": models.VectorParams(
                size=128,  # ColPali dim
                distance=models.Distance.COSINE,
                multivector_config=models.MultiVectorConfig(
                    comparator=models.MultiVectorComparator.MAX_SIM
                ),
            ),
        },
        optimizers_config=models.OptimizersConfigDiff(default_segment_number=2),
    )

    client.create_payload_index(
        collection_name=collection_name,
        field_name="centroid_lat",
        field_schema=models.PayloadSchemaType.FLOAT,
    )
    client.create_payload_index(
        collection_name=collection_name,
        field_name="centroid_lon",
        field_schema=models.PayloadSchemaType.FLOAT,
    )
    client.create_payload_index(
        collection_name=collection_name,
        field_name="acquisition_date",
        field_schema=models.PayloadSchemaType.DATETIME,
    )
    client.create_payload_index(
        collection_name=collection_name,
        field_name="burn_area",
        field_schema=models.PayloadSchemaType.FLOAT,
    )

    for split_name, dataset_split in ds_from_hub.items():
        print(f"Ingesting {len(dataset_split)} points from '{split_name}' split...")

        dataset_split = dataset_split.with_format("numpy")

        batch_size = 4
        total_points = len(dataset_split)

        for start_idx in range(0, total_points, batch_size):
            end_idx = min(start_idx + batch_size, total_points)
            batch = dataset_split.select(range(start_idx, end_idx))

            print(f"Processing batch {start_idx} to {end_idx}...")
            qdrant_points = generate_qdrant_points(batch)

            if qdrant_points:
                client.upsert(
                    collection_name=collection_name, points=qdrant_points, wait=True
                )
                print(f"Upserted batch {start_idx} to {end_idx}.")

        print(f"Finished ingesting '{split_name}' split.")

    print("Data ingestion complete for all splits.")

    count_result = client.count(collection_name=collection_name, exact=True)
    print(f"Total points in Qdrant collection: {count_result.count}")


if __name__ == "__main__":
    main()