import os
import json
import boto3
from typing import Optional
from pydantic import BaseModel
import pydantic_core
from redirects_base import Content, Customer, Redirects, Tag

s3_client = None
bucket_config = ''
bucket_data = ''


class S3Bucket(BaseModel):
    name: str
    ownerIdentity: dict
    arn: str

class S3Object(BaseModel):
    key: str
    eTag: Optional[str | None] = None
    size: Optional[int | None] = None
    sequencer: Optional[str | None] = None

class S3Event(BaseModel):
    s3SchemaVersion: str
    bucket: S3Bucket
    object: S3Object

class Record(BaseModel):
    eventName: str
    eventSource: str
    eventTime: str
    s3: S3Event

def lambda_handler(event: dict, context):
    global s3_client, bucket_config, bucket_data

    if s3_client is None:
        print("Init Function")
        bucket_config = os.environ.get('BUCKET_CONFIG', 'standout-config')
        bucket_data = os.environ.get('BUCKET_DATA', 'standout-data')
        print(f'Bucket Config: {bucket_config}')
        print(f'  Bucket Data: {bucket_data}')
        s3_client = boto3.client('s3')

    ## Download redirects file
    redirects: Redirects
    try: 
        #resp = s3_client.get_object(
        #    Bucket=bucket_config,
        #    Key='redirects.json'
        #)
        #redirects = Redirects(**json.load(resp['Body']))
        with open('/home/emanuele/dev/StandOut/lambda_config/redirects.json', 'r') as f:
            #redirects = Redirects(**json.load(f))
            redirects = Redirects.model_validate_json(f.read())
    except s3_client.exceptions.NoSuchKey as e:
        print(e)
        # Oppure pagina "siamo spiacenti ma il contenuto non e' disponibile"
        return {
            "statusCode": 404
        }

    # Proces records
    for r in event["Records"]:
        record = Record(**r)
        if record.eventSource != "aws:s3":
            return False
        
        print(f"Action: {record.eventName}")
        print(f"Object: {record.s3}")
        
        # splitta la chiave per capire la directory
        keys = record.s3.object.key.split('/')
        file_name = keys[-1]

        match record.eventName:
            case "ObjectCreated:Put" | "ObjectCreated:Post":
                print(f"ObjectCreated: {record.s3.object.key}")
                
                # crea il primo utente se necessario o selezionalo
                if redirects.customers is None:
                    redirects.customers = {keys[0]: Customer(status='active')}
                c = redirects.customers[keys[0]]

                # crea un tag per l'utente, con contenuto nullo o selezionalo
                if c.tags is None:
                    c.tags = {keys[1]: Tag(status="active", content=None)}
                t = c.tags[keys[1]]

                # crea un contenuto per il tag a seconda della lunghezza della chiave
                if file_name == "url.txt":
                    with s3_client.get_object(Bucket=bucket_data, Key=record.s3.object.key)['Body'] as url_file:
                        content = Content(type='url', key=file_name, url=url_file.readline().decode().strip())
                else:
                    content = Content(type='s3', key=file_name, url=None)

                match len(keys):
                    case 4:
                        if t.content is None:
                            t.content = {keys[2]: content}
                        elif isinstance(t.content, dict):
                            t.content[keys[2]] = content
                    case 3:
                        t.content = content
                    case _:
                        print("Too long keys")
                
            
                with open('/home/emanuele/dev/StandOut/lambda_config/redirects.json', 'w') as f:
                    f.write(redirects.model_dump_json(indent=2))
                return True
            
            
            case "ObjectCreated:Copy":
                print(f"Object copy: {record.s3.object.key}")
                return True
            

            case "s3:ObjectRemoved:*":
                print(f"Object remove: {record.s3.object.key}")
                return True
            
            case _:
                print("Unknown action")
        

if __name__ == "__main__":
    with open('/home/emanuele/dev/StandOut/lambda_config/test.json', 'r') as f:
        lambda_handler(json.load(f), None)