from flask import (
    current_app,
    Blueprint,
    redirect,
    render_template,
    request,
    url_for
)
from flask_login import login_required
from werkzeug.wrappers.response import Response
from werkzeug.utils import secure_filename

from .exceptions import exception_handler
from ..instructions import BrickInstructions
from ..instructions_list import BrickInstructionsList
from .upload import upload_helper

instructions_page = Blueprint(
    'instructions',
    __name__,
    url_prefix='/instructions'
)


# Index
@instructions_page.route('/', methods=['GET'])
@exception_handler(__file__)
def list() -> str:
    return render_template(
        'instructions.html',
        table_collection=BrickInstructionsList().list(),
    )


# Delete an instructions file
@instructions_page.route('/<name>/delete/', methods=['GET'])
@login_required
@exception_handler(__file__)
def delete(*, name: str) -> str:
    return render_template(
        'instructions.html',
        item=BrickInstructionsList().get_file(name),
        delete=True,
        error=request.args.get('error')
    )


# Actually delete an instructions file
@instructions_page.route('/<name>/delete/', methods=['POST'])
@login_required
@exception_handler(__file__, post_redirect='instructions.delete')
def do_delete(*, name: str) -> Response:
    instruction = BrickInstructionsList().get_file(name)

    # Delete the instructions file
    instruction.delete()

    # Reload the instructions
    BrickInstructionsList(force=True)

    return redirect(url_for('instructions.list'))


# Rename an instructions file
@instructions_page.route('/<name>/rename/', methods=['GET'])
@login_required
@exception_handler(__file__)
def rename(*, name: str) -> str:
    return render_template(
        'instructions.html',
        item=BrickInstructionsList().get_file(name),
        rename=True,
        error=request.args.get('error')
    )


# Actually rename an instructions file
@instructions_page.route('/<name>/rename/', methods=['POST'])
@login_required
@exception_handler(__file__, post_redirect='instructions.rename')
def do_rename(*, name: str) -> Response:
    instruction = BrickInstructionsList().get_file(name)

    # Grab the new filename
    filename = secure_filename(request.form.get('filename', ''))

    if filename != '':
        # Delete the instructions file
        instruction.rename(filename)

        # Reload the instructions
        BrickInstructionsList(force=True)

    return redirect(url_for('instructions.list'))


# Upload an instructions file
@instructions_page.route('/upload/', methods=['GET'])
@login_required
@exception_handler(__file__)
def upload() -> str:
    return render_template(
        'instructions.html',
        upload=True,
        error=request.args.get('error')
    )


# Actually upload an instructions file
@instructions_page.route('/upload', methods=['POST'])
@login_required
@exception_handler(__file__, post_redirect='instructions.upload')
def do_upload() -> Response:
    file = upload_helper(
        'file',
        'instructions.upload',
        extensions=current_app.config['INSTRUCTIONS_ALLOWED_EXTENSIONS'].value,
    )

    if isinstance(file, Response):
        return file

    BrickInstructions(file.filename).upload(file)  # type: ignore

    # Reload the instructions
    BrickInstructionsList(force=True)

    return redirect(url_for('instructions.list'))