"""ORM models for the Work Package Suite.

Three tables:
  - sops            one row per project SOP (the configuration baseline)
  - work_packages   one row per IWP, optionally linked to a SOP
  - comments        feedback / review comments from any page

The full client document for a SOP or WP is kept verbatim in a JSON `data`
column, with the most-queried fields promoted to real columns for listing and
filtering. IDs are short strings (client- or server-generated) so the browser
can upsert without round-tripping a sequence.

NO relationship() DECLARATIONS, ON PURPOSE — and one consequence to know about.
Every link here is a plain column plus a ForeignKey; nothing is navigable as
`project.work_packages`. Queries are explicit selects, which suits an API that
mostly reads one scoped list at a time and never wants a lazy load firing inside
a response.

The consequence: SQLAlchemy's unit of work derives FLUSH ORDER from relationships,
not from ForeignKey metadata. With none declared it has no dependency edge to
follow, so if you add a parent and its child in the SAME flush it may emit the
child's INSERT first and the database will reject it. Both engines enforce foreign
keys (Postgres always; SQLite since db.py sets `PRAGMA foreign_keys=ON`), so this
is a real error, not a dev-only quirk. Call `db.flush()` after adding the parent —
see `create_user` in app.py, which creates an account and its ProjectMember rows
together.
"""
from datetime import datetime, timezone
from typing import Optional
from sqlalchemy import String, Boolean, Integer, DateTime, ForeignKey, Text, JSON, UniqueConstraint
from sqlalchemy.orm import Mapped, mapped_column
from .db import Base


def utcnow() -> datetime:
    return datetime.now(timezone.utc)


class Project(Base):
    """A construction project — the top-level container. SOPs and Work Packages
    belong to a project so the suite can be used for many jobs at once."""
    __tablename__ = "projects"

    id: Mapped[str] = mapped_column(String(40), primary_key=True)
    name: Mapped[str] = mapped_column(String(300), default="")
    number: Mapped[str] = mapped_column(String(100), default="", index=True)
    client: Mapped[str] = mapped_column(String(300), default="")
    division: Mapped[str] = mapped_column(String(200), default="")
    site: Mapped[str] = mapped_column(String(300), default="")
    sample: Mapped[bool] = mapped_column(Boolean, default=False)
    # Archived projects are hidden from every picker, switcher and search but kept
    # for the record — a finished job still has to be readable years later. Unlike
    # an archived work package they are also FROZEN read-only: the API refuses any
    # write to the project or to anything under it until an admin unarchives it.
    archived_at: Mapped[Optional[datetime]] = mapped_column(DateTime(timezone=True), nullable=True, index=True)
    data: Mapped[dict] = mapped_column(JSON, default=dict)
    created_by: Mapped[str] = mapped_column(String(200), default="")
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=utcnow)
    updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=utcnow, onupdate=utcnow)

    def summary(self) -> dict:
        return {
            "id": self.id, "name": self.name, "number": self.number,
            "client": self.client, "division": self.division, "site": self.site,
            "sample": self.sample,
            "archived_at": _iso(self.archived_at), "archived": self.archived_at is not None,
            "created_by": self.created_by,
            "created_at": _iso(self.created_at), "updated_at": _iso(self.updated_at),
        }

    def to_dict(self) -> dict:
        return {**self.summary(), "data": self.data or {}}


class Sop(Base):
    __tablename__ = "sops"

    id: Mapped[str] = mapped_column(String(40), primary_key=True)
    project_id: Mapped[Optional[str]] = mapped_column(
        String(40), ForeignKey("projects.id", ondelete="CASCADE"), nullable=True, index=True
    )
    name: Mapped[str] = mapped_column(String(300), default="")
    number: Mapped[str] = mapped_column(String(100), default="")
    complete: Mapped[bool] = mapped_column(Boolean, default=False)
    data: Mapped[dict] = mapped_column(JSON, default=dict)
    created_by: Mapped[str] = mapped_column(String(200), default="")
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=utcnow)
    updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=utcnow, onupdate=utcnow)

    def summary(self) -> dict:
        return {
            "id": self.id, "project_id": self.project_id, "name": self.name,
            "number": self.number, "complete": self.complete, "created_by": self.created_by,
            "created_at": _iso(self.created_at), "updated_at": _iso(self.updated_at),
        }

    def to_dict(self) -> dict:
        return {**self.summary(), "data": self.data or {}}


class WorkPackage(Base):
    __tablename__ = "work_packages"

    id: Mapped[str] = mapped_column(String(40), primary_key=True)
    project_id: Mapped[Optional[str]] = mapped_column(
        String(40), ForeignKey("projects.id", ondelete="CASCADE"), nullable=True, index=True
    )
    sop_id: Mapped[Optional[str]] = mapped_column(
        String(40), ForeignKey("sops.id", ondelete="SET NULL"), nullable=True, index=True
    )
    # parent_id links a discipline instance (WP01A) back to its master (WP01).
    parent_id: Mapped[Optional[str]] = mapped_column(String(40), nullable=True, index=True)
    number: Mapped[str] = mapped_column(String(120), default="")
    subject: Mapped[str] = mapped_column(String(400), default="")
    type: Mapped[str] = mapped_column(String(120), default="")
    status: Mapped[str] = mapped_column(String(40), default="Draft")
    # The accountable owner (a user id), for "My Work Packages" + assignment
    # notifications. Free-text `data.assignees`/`distribution` still hold the wider list.
    assignee_id: Mapped[Optional[str]] = mapped_column(String(40), nullable=True, index=True)
    issued_at: Mapped[Optional[datetime]] = mapped_column(DateTime(timezone=True), nullable=True)
    # Archived packages are hidden from the default lists/dashboard but kept for
    # the record (years-long projects accumulate hundreds of closed WPs).
    archived_at: Mapped[Optional[datetime]] = mapped_column(DateTime(timezone=True), nullable=True, index=True)
    data: Mapped[dict] = mapped_column(JSON, default=dict)
    created_by: Mapped[str] = mapped_column(String(200), default="")
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=utcnow)
    updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=utcnow, onupdate=utcnow)

    def summary(self) -> dict:
        return {
            "id": self.id, "project_id": self.project_id, "sop_id": self.sop_id,
            "parent_id": self.parent_id, "number": self.number, "subject": self.subject,
            "type": self.type, "status": self.status, "assignee_id": self.assignee_id,
            "issued_at": _iso(self.issued_at),
            "archived_at": _iso(self.archived_at), "archived": self.archived_at is not None,
            "created_by": self.created_by,
            "created_at": _iso(self.created_at), "updated_at": _iso(self.updated_at),
        }

    def to_dict(self) -> dict:
        return {**self.summary(), "data": self.data or {}}


class User(Base):
    """A login account. Passwords are never stored in the clear — only a bcrypt
    hash (see server/auth.py). `username` is what people sign in with.

    Two independent notions of "role", deliberately separate:
      • role          the PERMISSIONS role — what the account may do in the app.
                      'admin' | 'project_super_user' | 'project_admin' |
                      'project_user' (see auth.ROLES).
      • project_role  the person's JOB FUNCTION on the project (Project Manager,
                      Superintendent, QA/QC, …). Carries no permissions; it's what
                      the SOP team pickers and notification routing read.
    """
    __tablename__ = "users"

    id: Mapped[str] = mapped_column(String(40), primary_key=True)
    username: Mapped[str] = mapped_column(String(120), unique=True, index=True)
    email: Mapped[str] = mapped_column(String(200), default="")
    full_name: Mapped[str] = mapped_column(String(200), default="")
    password_hash: Mapped[str] = mapped_column(String(200), default="")
    role: Mapped[str] = mapped_column(String(20), default="project_user")  # permissions role
    # Job function on the project — free text, offered from a suggested list.
    project_role: Mapped[str] = mapped_column(String(120), default="")
    # A PM or QA lead who belongs on every job shouldn't have to be ticked into each
    # new project by hand, so flagged accounts get a ProjectMember row the moment a
    # project is created. `auto_add_role` is the role they land with and shares
    # ProjectMember.role's value space: '' = inherit the account's own role,
    # otherwise 'project_admin' | 'project_user'.
    auto_add_projects: Mapped[bool] = mapped_column(Boolean, default=False)
    auto_add_role: Mapped[str] = mapped_column(String(20), default="")
    # Display preferences. Empty means "fall back to the app default, then to the
    # browser". A stored value follows the person between devices, which matters on
    # shared field tablets where the browser locale isn't theirs.
    locale: Mapped[str] = mapped_column(String(20), default="")      # BCP47, e.g. en-US
    timezone: Mapped[str] = mapped_column(String(60), default="")    # IANA, e.g. America/Chicago
    is_active: Mapped[bool] = mapped_column(Boolean, default=True)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=utcnow)
    updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=utcnow, onupdate=utcnow)
    last_login_at: Mapped[Optional[datetime]] = mapped_column(DateTime(timezone=True), nullable=True)
    # Online-guessing throttle (see login()): consecutive failures + a lockout window.
    failed_attempts: Mapped[int] = mapped_column(Integer, default=0)
    locked_until: Mapped[Optional[datetime]] = mapped_column(DateTime(timezone=True), nullable=True)
    # Bumped to invalidate all existing sessions for this user (e.g. on a password
    # change). The value is embedded in the JWT and re-checked on every request.
    token_version: Mapped[int] = mapped_column(Integer, default=0)

    def to_dict(self) -> dict:
        """Public view of a user — NEVER includes the password hash."""
        return {
            "id": self.id, "username": self.username, "email": self.email,
            "full_name": self.full_name, "role": self.role,
            "project_role": self.project_role or "", "is_active": self.is_active,
            "auto_add_projects": bool(self.auto_add_projects),
            "auto_add_role": self.auto_add_role or "",
            "locale": self.locale or "", "timezone": self.timezone or "",
            "created_at": _iso(self.created_at), "last_login_at": _iso(self.last_login_at),
        }


class ProjectMember(Base):
    """Which users may access which projects, and what they may do there. A user
    sees/operates on a project only if a row links them to it (admins bypass this
    entirely). One row per (user, project) pair.

    `role` is the permissions role ON THIS PROJECT: someone can be Project Admin on
    one job and a normal Project User on another, or a Project Super User (who
    administers that job's user accounts) on one job only. Empty means "inherit the
    account's own role" (User.role), which is how every existing row behaves.
    Values: '' | 'project_super_user' | 'project_admin' | 'project_user'
    (auth.PROJECT_SCOPED_ROLES) — never 'admin', which is app-wide by definition."""
    __tablename__ = "project_members"
    __table_args__ = (UniqueConstraint("user_id", "project_id", name="uq_project_member"),)

    id: Mapped[str] = mapped_column(String(40), primary_key=True)
    user_id: Mapped[str] = mapped_column(
        String(40), ForeignKey("users.id", ondelete="CASCADE"), index=True
    )
    project_id: Mapped[str] = mapped_column(
        String(40), ForeignKey("projects.id", ondelete="CASCADE"), index=True
    )
    role: Mapped[str] = mapped_column(String(20), default="")   # '' = inherit User.role
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=utcnow)


class Comment(Base):
    __tablename__ = "comments"

    id: Mapped[str] = mapped_column(String(40), primary_key=True)
    source: Mapped[str] = mapped_column(String(40), default="", index=True)  # home_feedback | sop_step_comment | wp_review_comment
    sop_id: Mapped[Optional[str]] = mapped_column(String(40), nullable=True, index=True)
    wp_id: Mapped[Optional[str]] = mapped_column(String(40), nullable=True, index=True)
    step: Mapped[Optional[int]] = mapped_column(Integer, nullable=True)
    author: Mapped[str] = mapped_column(String(200), default="")
    text: Mapped[str] = mapped_column(Text, default="")
    page: Mapped[str] = mapped_column(String(200), default="")
    extra: Mapped[dict] = mapped_column(JSON, default=dict)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=utcnow)

    def to_dict(self) -> dict:
        return {
            "id": self.id, "source": self.source, "sop_id": self.sop_id, "wp_id": self.wp_id,
            "step": self.step, "author": self.author, "text": self.text, "page": self.page,
            "created_at": _iso(self.created_at),
        }


class AuditLog(Base):
    """Append-only history: who changed what, when. Rows are written inside the
    same transaction as the change they describe (see server/app.py: log_event),
    so the trail can't drift from the data. `detail` holds a compact JSON summary
    of the change, e.g. {"from": "Scheduled", "to": "Issued"}.

    Not a ForeignKey to any entity on purpose — the log must survive the deletion
    of the thing it describes (you still want "who deleted WP01, and when")."""
    __tablename__ = "audit_log"

    id: Mapped[str] = mapped_column(String(40), primary_key=True)
    at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=utcnow, index=True)
    actor: Mapped[str] = mapped_column(String(200), default="")               # username who made the change
    action: Mapped[str] = mapped_column(String(60), default="", index=True)   # created | updated | status_changed | issued | role_changed | ...
    entity_type: Mapped[str] = mapped_column(String(40), default="", index=True)  # wp | sop | project | user
    entity_id: Mapped[str] = mapped_column(String(40), default="", index=True)
    project_id: Mapped[Optional[str]] = mapped_column(String(40), nullable=True, index=True)
    summary: Mapped[str] = mapped_column(String(400), default="")             # human one-liner (e.g. the WP number/subject)
    detail: Mapped[dict] = mapped_column(JSON, default=dict)

    def to_dict(self) -> dict:
        return {
            "id": self.id, "at": _iso(self.at), "actor": self.actor, "action": self.action,
            "entity_type": self.entity_type, "entity_id": self.entity_id,
            "project_id": self.project_id, "summary": self.summary, "detail": self.detail or {},
        }


class AppSetting(Base):
    """Admin-editable application settings (feature flags, SMTP config, …) stored
    as key -> JSON value. Read/written via /api/settings (admin only). Secrets like
    the SMTP password are NOT stored here — they come from the environment."""
    __tablename__ = "app_settings"

    key: Mapped[str] = mapped_column(String(80), primary_key=True)
    value: Mapped[dict] = mapped_column(JSON, default=dict)
    updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=utcnow, onupdate=utcnow)


class Notification(Base):
    """Outbox for user notifications (an in-app record + an optional email). A row
    is written when something notable happens (e.g. a WP assignment); the email
    sender processes it only when email notifications are enabled AND SMTP is set —
    otherwise it's recorded as 'skipped'. See server/notify.py."""
    __tablename__ = "notifications"

    id: Mapped[str] = mapped_column(String(40), primary_key=True)
    user_id: Mapped[str] = mapped_column(String(40), index=True)          # recipient
    email: Mapped[str] = mapped_column(String(200), default="")
    kind: Mapped[str] = mapped_column(String(40), default="", index=True)  # wp_assigned | …
    wp_id: Mapped[Optional[str]] = mapped_column(String(40), nullable=True)
    project_id: Mapped[Optional[str]] = mapped_column(String(40), nullable=True, index=True)
    subject: Mapped[str] = mapped_column(String(300), default="")
    body: Mapped[str] = mapped_column(Text, default="")
    link: Mapped[str] = mapped_column(String(500), default="")
    status: Mapped[str] = mapped_column(String(20), default="pending", index=True)  # pending|sent|failed|skipped
    error: Mapped[str] = mapped_column(String(400), default="")
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=utcnow, index=True)
    sent_at: Mapped[Optional[datetime]] = mapped_column(DateTime(timezone=True), nullable=True)

    def to_dict(self) -> dict:
        return {
            "id": self.id, "user_id": self.user_id, "email": self.email, "kind": self.kind,
            "wp_id": self.wp_id, "project_id": self.project_id, "subject": self.subject,
            "status": self.status, "error": self.error,
            "created_at": _iso(self.created_at), "sent_at": _iso(self.sent_at),
        }


def _iso(dt: Optional[datetime]) -> Optional[str]:
    return dt.isoformat() if dt else None