"""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.
"""
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