import datetime
import requests
import io

"""
Interface

The bridge between web application(niming) and igapi.
An interface should have a get() function.
"""

HOST="http://172.16.20.145:3000"

def get(index:int, media:bool=True) -> dict | None:
    """
    Every interface should have this function.
    Backend calls this function to get data of a post.
    
    Args:
        index (int): ID of the post
        media (bool): Send media or not
    
    Returns:
        dict: Data of a post. Formatted as shown in Note 1 (an_example_of_context)
        None: An error occurred, and nothing was returned.
    """
    
    # get data
    ## fake server in localhost
    ### where is the api of web application?
    res = requests.get(f"{HOST}/api/post?cursor={index}")
    if res.status_code != 200:
        return None
    
    rj = res.json()[0]
    media_arr = []
    
    # get media
    if media and rj["enclosure"] is not None:
        for m in rj["enclosure"]:
            _m = requests.get(f"{HOST}/static/{m}")
            if _m.status_code == 200:
                media_arr.append(io.BytesIO(_m.content))
    
    # return
    result = {
        "id": rj["id"],
        "metadata": {
            "create_time": datetime.datetime.strptime(rj["post_at"], "%Y-%m-%dT%H:%M:%S.%fZ").replace(tzinfo=datetime.timezone.utc),
            "author": rj["signing"],
            "tags": [],
            "category": "",
            # ext
            "parent": None #rj["parent"] # parent id
        },
        "content": {
            "text": rj["content"],
            "media": media_arr
        }
    }
    
    return result


# Note 1
an_example_of_context = {
    "id": int,
    "metadata": {
        "create_time": datetime.datetime,
        "author": str,
        "tags": list[str],
        "category": str,
        # ext
        "parent": int | None # parent id
    },
    "content": {
        "text": str,
        "media": [
            io.BytesIO
        ]
    }
}