from diagrams import Diagram
from diagrams.c4 import Component, Container, Database, System, SystemBoundary, Relationship

graph_attr = {
    "splines": "spline",
}

with Diagram(
    "Component diagram for Internet Banking System - API Application",
    direction="TB",
    graph_attr=graph_attr,
    show=False,
):
    spa = Container(
        name="Single-Page Application",
        technology="Javascript and Angular",
        description="Provides all of the Internet banking functionality to customers via their web browser.",
    )

    mobileapp = Container(
        name="Mobile App",
        technology="Xamarin",
        description="Provides a limited subset of the Internet banking functionality to customers via their mobile device.",
    )

    with SystemBoundary("Internet Banking System"):
        sign_in_controller = Component(
            name="Sign In Controller",
            technology="Spring MVC Rest Controller",
            description="Allows users to sign in to the Internet Banking System.",
        )

        security_component = Component(
            name="Security Component",
            technology="Spring Bean",
            description="Provides functionality related to signing in, changing passwords, etc.",
        )

        reset_password_controller = Component(
            name="Reset Password Controller",
            technology="Spring MVC Rest Controller",
            description="Allows users to reset their password with a single use URL.",
        )

        email_component = Component(
            name="Email Component",
            technology="Spring Bean",
            description="Sends e-mails to users.",
        )

        accounts_summary_controller = Component(
            name="Accounts Summary Controller",
            technology="Spring MVC Rest Controller",
            description="Provides customers with a summary of their bank accounts.",
        )

        mainframe_banking_system_facade = Component(
            name="Mainframe Banking System Facade",
            technology="Spring Bean",
            description="A facade onto the mainframe banking system.",
        )

    database = Database(
        name="Database",
        technology="Oracle Database Schema",
        description="Stores user registration information, hashed authentication credentials, access logs, etc.",
    )

    email = System(
        name="E-mail System",
        description="The internal Microsoft Exchange e-mail system.",
        external=True,
    )

    mainframe = System(
        name="Mainframe Banking System",
        description="Stores all of the core banking information about customers, accounts, transactions, etc.",
        external=True,
    )

    spa >> Relationship("Make API calls to [JSON/HTTPS]") >> sign_in_controller
    spa >> Relationship("Make API calls to [JSON/HTTPS]") >> reset_password_controller
    spa >> Relationship("Make API calls to [JSON/HTTPS]") >> accounts_summary_controller
    mobileapp >> Relationship("Make API calls to [JSON/HTTPS]") >> sign_in_controller
    mobileapp >> Relationship("Make API calls to [JSON/HTTPS]") >> reset_password_controller
    mobileapp >> Relationship("Make API calls to [JSON/HTTPS]") >> accounts_summary_controller

    sign_in_controller >> Relationship("Uses") >> security_component
    reset_password_controller >> Relationship("Uses") >> security_component
    reset_password_controller >> Relationship("Uses") >> email_component
    accounts_summary_controller >> Relationship("Uses") >> mainframe_banking_system_facade

    security_component >> Relationship("Reads from and writes to [SQL/TCP]") >> database
    email_component >> Relationship("Sends e-mail using") >> email
    mainframe_banking_system_facade >> Relationship("Makes API calls to [XML/HTTPS]") >> mainframe