from pymongo import MongoClient
from datetime import datetime
import pytz
from prefect_utils import trigger_maintenance_request
from prefect import task
import pandas as pd
import os
import asyncio

MONGODB_PASSWORD = os.getenv("MONGODB_PASSWORD")

blinded_connection_string = os.getenv("blinded_connection_string")

connection_string = blinded_connection_string.replace("<db_password>", MONGODB_PASSWORD)


@task
def generate_empty_well():
    dbclient = MongoClient(connection_string)
    db = dbclient["LCM-OT-2-SLD"]  
    collection = db["wells"] 
    rows = ['B', 'C', 'D', 'E', 'F', 'G', 'H']
    columns = [str(i) for i in range(1, 13)]
    for row in rows:
        for col in columns:
            well = f"{row}{col}"
            metadata = {
                "well": well,
                "status": "empty",
                "project": "OT2"
            }

            #send_data_to_mongodb(collection="wells", data=metadata)
            query = {"well": well}
            update_data = {"$set": metadata}  
            result = collection.update_one(query, update_data, upsert=True)
            
    # close connection
    dbclient.close()

@task 
def update_used_wells(used_wells):
    dbclient = MongoClient(connection_string)
    db = dbclient["LCM-OT-2-SLD"]  
    collection = db["wells"] 

    for well in used_wells:
        metadata = {
            "well": well,
            "status": "used",
            "project": "OT2"
        }
        #send_data_to_mongodb(collection="wells", data=metadata)
        query = {"well": well}
        update_data = {"$set": metadata}  
        result = collection.update_one(query, update_data, upsert=True)
        
    # close connection
    dbclient.close()

def find_unused_wells():
    dbclient = MongoClient(connection_string)
    db = dbclient["LCM-OT-2-SLD"]  
    collection = db["wells"] 
    query = {"status": "empty"}
    response = list(collection.find(query))  
    df = pd.DataFrame(response)

    # Extract the "well" column as a list
    #if "well" not in df.columns:
    #    raise ValueError("No available wells.")
    # Sort obtained list
    def well_sort_key(well):
        row = well[0]  # A, B, C, ...
        col = int(well[1:])  # 1, 2, ..., 12
        return (row, col)
    if "well" in df.columns:
        empty_wells = sorted(df["well"].tolist(), key=well_sort_key)
    else:
        empty_wells = []

    if len(empty_wells) == 1:
        maintenance_type =  "wellplate_maintenance"
        if check_maintenance_status(maintenance_type) == 0:
            asyncio.run(trigger_maintenance_request(maintenance_type))
            set_maintenance_status(maintenance_type,1)
        else:
            print("[DEBUG] a maintenance request has been sent")
    
    dbclient.close()

    # Check if there are any empty wells
    #if len(empty_wells) == 0:
    #    raise ValueError("No empty wells found")
    #print(empty_wells)
    return empty_wells
    
@task 
def save_result(result_data):
    dbclient = MongoClient(connection_string)
    db = dbclient["LCM-OT-2-SLD"]  
    collection = db["result"] 
    #collection = db["test_result"] 
    result_data["timestamp"] = datetime.now(pytz.timezone("America/Toronto"))  # UTC time
    insert_result = collection.insert_one(result_data)
    inserted_id = insert_result.inserted_id
    # close connection
    dbclient.close()
    return inserted_id    

def get_student_quota(student_id):
    with MongoClient(connection_string) as client:
        db = client["LCM-OT-2-SLD"]  
        collection = db["student"] 
        student = collection.find_one({"student_id": student_id})
        if student is None:
            raise ValueError(f"Student ID '{student_id}' not found in the database.")
        return student.get("quota", 0) 
  
def decrement_student_quota(student_id):
    dbclient = MongoClient(connection_string)
    db = dbclient["LCM-OT-2-SLD"]  
    collection = db["student"] 

    student = collection.find_one({"student_id": student_id})
    if not student:
        return f"Student ID {student_id} not found."
    if student.get("quota", 0) <= 0:
        return f"Student ID {student_id} has no remaining quota."

    
    result = collection.update_one(
            {"student_id": student_id, "quota": {"$gt": 0}},  
            {"$inc": {"quota": -1}} 
        )

    if result.modified_count > 0:
        return f"Student ID {student_id}'s quota update successfully."
    else:
        return f"Quota update failed for Student ID {student_id}."
    
def add_student_quota(student_id, quota):
    """
    Adds a new student with a given quota.
    :param student_id: The ID of the student.
    :param quota: The initial quota for the student.
    """
    dbclient = MongoClient(connection_string)
    db = dbclient["LCM-OT-2-SLD"]
    collection = db["student"]
    student_data = {"student_id": student_id, "quota": quota}
    collection.update_one({"student_id": student_id}, {"$set": student_data}, upsert=True)
    dbclient.close()

def check_maintenance_status(maintenance_type):
    dbclient = MongoClient(connection_string)
    db = dbclient["LCM-OT-2-SLD"]
    collection = db["HITL_status"]
    status_doc = collection.find_one({"name": maintenance_type})
    dbclient.close()

    if status_doc is None:
        return 0
    return status_doc.get("flag", 0)

def set_maintenance_status(maintenance_type,new_status):
    #flag == 1, request sent; flag == 0, no request undergoing
    dbclient = MongoClient(connection_string)
    db = dbclient["LCM-OT-2-SLD"]
    collection = db["HITL_status"]

    collection.update_one(
        {"name": maintenance_type},
        {"$set": {"flag": new_status,
                   "timestamp": datetime.now(pytz.timezone("America/Toronto"))}
         },
        upsert=True
    )
    dbclient.close()

def insert_maintenance_log(maintenance_type, operator="Unknown"):
    dbclient = MongoClient(connection_string)
    db = dbclient["LCM-OT-2-SLD"]
    collection = db["maintenance_logs"]

    log_data = {
        "maintenance_type": maintenance_type,
        "timestamp": datetime.now(pytz.timezone("America/Toronto")),
        "operator": operator
    }
    collection.insert_one(log_data)
    dbclient.close()


if __name__ == "__main__":
    #generate_empty_well()
    
    find_unused_wells()