"""
Mail Intake — provider-agnostic, read-only email ingestion framework.

Mail Intake is a **contract-first library** designed to ingest, parse, and
normalize email data from external providers (such as Gmail) into clean,
provider-agnostic domain models.

The library is intentionally structured around clear layers, each exposed
as a first-class module at the package root:

- adapters: provider-specific access (e.g. Gmail)
- auth: authentication providers and credential lifecycle management
- credentials: credential persistence abstractions and implementations
- parsers: extraction and normalization of message content
- ingestion: orchestration and high-level ingestion workflows
- models: canonical, provider-agnostic data representations
- config: explicit global configuration
- exceptions: library-defined error hierarchy

The package root acts as a **namespace**, not a facade. Consumers are
expected to import functionality explicitly from the appropriate module.

----------------------------------------------------------------------
Installation
----------------------------------------------------------------------

Install using pip:

    pip install mail-intake

Or with Poetry:

    poetry add mail-intake

Mail Intake is pure Python and has no runtime dependencies beyond those
required by the selected provider (for example, Google APIs for Gmail).

----------------------------------------------------------------------
Basic Usage
----------------------------------------------------------------------

Minimal Gmail ingestion example (local development):

    from mail_intake.ingestion import MailIntakeReader
    from mail_intake.adapters import MailIntakeGmailAdapter
    from mail_intake.auth import MailIntakeGoogleAuth
    from mail_intake.credentials import PickleCredentialStore

    store = PickleCredentialStore(path="token.pickle")

    auth = MailIntakeGoogleAuth(
        credentials_path="credentials.json",
        store=store,
        scopes=["https://www.googleapis.com/auth/gmail.readonly"],
    )

    adapter = MailIntakeGmailAdapter(auth_provider=auth)
    reader = MailIntakeReader(adapter)

    for message in reader.iter_messages("from:recruiter@example.com"):
        print(message.subject, message.from_email)

Iterating over threads:

    for thread in reader.iter_threads("subject:Interview"):
        print(thread.normalized_subject, len(thread.messages))

----------------------------------------------------------------------
Extensibility Model
----------------------------------------------------------------------

Mail Intake is designed to be extensible via **public contracts** exposed
through its modules:

- Users MAY implement their own mail adapters by subclassing
  ``adapters.MailIntakeAdapter``
- Users MAY implement their own authentication providers by subclassing
  ``auth.MailIntakeAuthProvider[T]``
- Users MAY implement their own credential persistence layers by
  implementing ``credentials.CredentialStore[T]``

Users SHOULD NOT subclass built-in adapter implementations. Built-in
adapters (such as Gmail) are reference implementations and may change
internally without notice.

----------------------------------------------------------------------
Public API Surface
----------------------------------------------------------------------

The supported public API consists of the following top-level modules:

- mail_intake.ingestion
- mail_intake.adapters
- mail_intake.auth
- mail_intake.credentials
- mail_intake.parsers
- mail_intake.models
- mail_intake.config
- mail_intake.exceptions

Classes and functions should be imported explicitly from these modules.
No individual symbols are re-exported at the package root.

----------------------------------------------------------------------
Design Guarantees
----------------------------------------------------------------------

- Read-only access: no mutation of provider state
- Provider-agnostic domain models
- Explicit configuration and dependency injection
- No implicit global state or environment reads
- Deterministic, testable behavior
- Distributed-safe authentication design

Mail Intake favors correctness, clarity, and explicitness over convenience
shortcuts.
"""


from . import ingestion
from . import adapters
from . import auth
from . import credentials
from . import models
from . import config
from . import exceptions

__all__ = [
    "ingestion",
    "adapters",
    "auth",
    "credentials",
    "models",
    "config",
    "exceptions",
]