#!/usr/bin/env python3
import os
import datetime
from pathlib import Path
from google.cloud import storage

# =============================================================================
# CONFIGURATION CONSTANTS
# =============================================================================

CREATE_BACKUP = False
UPLOAD_FIRMWARE = True
UPLOAD_MANIFEST = True
UPLOAD_DATA = True


# The name of your Google Cloud Storage bucket.
GCS_BUCKET_NAME = 'boothifier'  # <-- Change this

# The destination directory (prefix) inside your bucket.
# For example, 'release' or 'prod'. Use an empty string ('') to use the bucket root.
DESTINATION_DIR = 'latest'  # <-- Change this (or leave '' for bucket root)
BACKUPS_DIR = 'backups'  

LOCAL_ROOT_PATH = Path(__file__).parent.resolve()

# Path to your Google Cloud credentials JSON file.
GOOGLE_APPLICATION_CREDENTIALS_PATH = str(LOCAL_ROOT_PATH / 'loyal-column-439819-e3-8cddff2ee2c2.json')


# Local path to the firmware file.
LOCAL_FIRMWARE_PATH = str(LOCAL_ROOT_PATH / 'firmware.bin')  # <-- Change this if needed
LOCAL_MANIFEST_PATH = str(LOCAL_ROOT_PATH / 'update.json')  # <-- Change this if needed

# Local path to the data directory.
LOCAL_DATA_DIRECTORY = 'data'  # <-- Change this if needed

# =============================================================================
# SET UP GOOGLE CLOUD CREDENTIALS
# =============================================================================
os.environ['GOOGLE_APPLICATION_CREDENTIALS'] = GOOGLE_APPLICATION_CREDENTIALS_PATH

# =============================================================================
# HELPER FUNCTIONS
# =============================================================================

def backup_existing_files(bucket, destination_prefix, backups_prefix, backup_folder):
    """
    Copy every blob in the bucket with a name starting with destination_prefix
    (except any files already in a backup folder) into a backup folder under backups_prefix.
    
    Files will be copied into:
      <backups_prefix>/<backup_folder>/<relative_path>
    """
    blobs = bucket.list_blobs(prefix=destination_prefix)
    for blob in blobs:
        # Compute the file's relative path by removing the destination_prefix.
        if destination_prefix:
            # Remove the destination_prefix and any leading slashes.
            relative_path = blob.name[len(destination_prefix):].lstrip('/')
        else:
            relative_path = blob.name

        # Construct the new blob name in the backup folder under backups_prefix.
        if backups_prefix:
            new_blob_name = f"{backups_prefix}/{backup_folder}/{relative_path}"
        else:
            new_blob_name = f"{backup_folder}/{relative_path}"

        print(f"Backing up: copying '{blob.name}' to '{new_blob_name}'")
        bucket.copy_blob(blob, bucket, new_blob_name)

def upload_file(bucket, local_path, destination_blob_name):
    """
    Upload a single file to the bucket with the specified blob name.
    Overwrites the blob if it already exists.
    """
    print(f"Uploading file '{local_path}' to '{destination_blob_name}'")
    blob = bucket.blob(destination_blob_name)
    # Set Cache-Control header to force clients to always fetch fresh content.
    blob.cache_control = 'private, max-age=0, no-transform'
    blob.upload_from_filename(local_path)

def upload_directory(bucket, local_directory, destination_prefix):
    """
    Recursively upload the contents of the local directory to the bucket under
    destination_prefix. The directory structure is preserved.
    """
    for root, _, files in os.walk(local_directory):
        for file in files:
            file_local_path = os.path.join(root, file)
            # Compute the relative path of the file from the base directory.
            rel_path = os.path.relpath(file_local_path, local_directory)
            if destination_prefix:
                dest_blob_name = f"{destination_prefix}/{rel_path}"
            else:
                dest_blob_name = rel_path
            upload_file(bucket, file_local_path, dest_blob_name)

# =============================================================================
# MAIN FUNCTION
# =============================================================================

def main():
    # Initialize the Google Cloud Storage client.
    client = storage.Client()
    bucket = client.bucket(GCS_BUCKET_NAME)

    # Normalize the destination prefix by stripping any trailing slashes.
    destination_prefix = DESTINATION_DIR.strip('/')
    backups_prefix = BACKUPS_DIR.strip('/')

    if(CREATE_BACKUP):
        # Create a backup folder name with a timestamp.
        timestamp = datetime.datetime.now().strftime("%Y%m%d_%H%M%S")
        backup_folder = f"backup_{timestamp}"
        print(f"Creating backup folder '{backup_folder}' inside '{destination_prefix}' and copying existing files...")
        backup_existing_files(bucket, destination_prefix, backups_prefix, backup_folder)
        

    if(UPLOAD_FIRMWARE):
        print("Uploading firmware...")
        # Upload the firmware file.
        if destination_prefix:
            firmware_destination = f"{destination_prefix}/firmware.bin"
        else:
            firmware_destination = "firmware.bin"
        upload_file(bucket, LOCAL_FIRMWARE_PATH, firmware_destination)
    
    if(UPLOAD_MANIFEST):
        print("Uploading manifest...")
        # Upload the manifest.
        if destination_prefix:
            manifest_destination = f"{destination_prefix}/update.json"
        else:
            manifest_destination = "update.json"
        upload_file(bucket, LOCAL_MANIFEST_PATH, manifest_destination)

    if(UPLOAD_DATA):
        print("Uploading data directory...")
        # Upload the data directory.
        if destination_prefix:
            data_destination = f"{destination_prefix}/data"
        else:
            data_destination = "data"
        upload_directory(bucket, LOCAL_DATA_DIRECTORY, data_destination)


    print("Upload complete.")

if __name__ == '__main__':
    main()