import csv
import json
import os
from typing import List
import datasets
import logging

# TODO: Add BibTeX citation
# Find for instance the citation on arxiv or on the dataset repo/website
_CITATION = """\
@InProceedings{huggingface:dataset,
title = {A great new dataset},
author={huggingface, Inc.
},
year={2020}
}
"""

# TODO: Add description of the dataset here
# You can copy an official description
_DESCRIPTION = """\
This dataset contains traffic images from traffic signal cameras of singapore. The images are captured at 1.5 minute interval from 6 pm to 7 pm everyday for the month of January 2024.
"""

# TODO: Add a link to an official homepage for the dataset here
_HOMEPAGE = "https://beta.data.gov.sg/collections/354/view"

# TODO: Add the licence for the dataset here if you can find it
_LICENSE = ""

# TODO: Add link to the official dataset URLs here
# The HuggingFace Datasets library doesn't host the datasets but only points to the original files.
# This can be an arbitrary nested dict/list of URLs (see below in `_split_generators` method)
_URL = "https://github.com/Sayali-pingle/HuggingFace--Traffic-Image-Dataset/blob/main/camera_data.csv"
_URLS = {
    "train": _URL + "train-v1.1.json",
    "dev": _URL + "dev-v1.1.json",
}

# TODO: Name of the dataset usually matches the script name with CamelCase instead of snake_case
class TrafficImages(datasets.GeneratorBasedBuilder):
    """TODO: Short description of my dataset."""

    _URLS = _URLS
    VERSION = datasets.Version("1.1.0")

    def _info(self):
        return datasets.DatasetInfo(
            description=_DESCRIPTION,
            features=datasets.Features(
                {
                    "timestamp": datasets.Value("string"),
                    "camera_id": datasets.Value("string"),
                    "latitude": datasets.Value("float"),
                    "longitude": datasets.Value("float"),
                    "image_url": datasets.Value("string"),
                    "image_metadata": datasets.Value("string")
                }
            ),
            homepage=_HOMEPAGE,
            citation=_CITATION,
        )
    
    def _split_generators(self, dl_manager: datasets.DownloadManager) -> List[datasets.SplitGenerator]:
      urls_to_download = self._URLS
      downloaded_files = dl_manager.download_and_extract(urls_to_download)

      return [
          datasets.SplitGenerator(name=datasets.Split.TRAIN, gen_kwargs={"filepath": downloaded_files["train"]}),
          datasets.SplitGenerator(name=datasets.Split.VALIDATION, gen_kwargs={"filepath": downloaded_files["dev"]}),
      ]
      
    def _generate_examples(self, file_path):
        # This method will yield examples from your dataset
        start_date = datetime(2024, 1, 1, 18, 0, 0)
        end_date = datetime(2024, 1, 31, 19, 0, 0)
        interval_seconds = 240

        date_time_strings = [
            (current_date + timedelta(seconds=seconds)).strftime('%Y-%m-%dT%H:%M:%S+08:00')
            for current_date in pd.date_range(start=start_date, end=end_date, freq='D')
            for seconds in range(0, 3600, interval_seconds)
        ]

        url = 'https://api.data.gov.sg/v1/transport/traffic-images'
        camera_data = []

        for date_time in date_time_strings:
            params = {'date_time': date_time}
            response = requests.get(url, params=params)

            if response.status_code == 200:
                data = response.json()
                camera_data.extend([
                    {
                        'timestamp': item['timestamp'],
                        'camera_id': camera['camera_id'],
                        'latitude': camera['location']['latitude'],
                        'longitude': camera['location']['longitude'],
                        'image_url': camera['image'],
                        'image_metadata': camera['image_metadata']
                    }
                    for item in data['items']
                    for camera in item['cameras']
                ])
            else:
                print(f"Error: {response.status_code}")

        for idx, example in enumerate(camera_data):
            yield idx, {
                "timestamp": example["timestamp"],
                "camera_id": example["camera_id"],
                "latitude": example["latitude"],
                "longitude": example["longitude"],
                "image_url": example["image_url"],
                "image_metadata": example["image_metadata"]
            }