"""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
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)
    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, "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")
    issued_at: Mapped[Optional[datetime]] = mapped_column(DateTime(timezone=True), nullable=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, "issued_at": _iso(self.issued_at),
            "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; `role` is
    either 'admin' (can manage users) or 'user'."""
    __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="user")  # 'admin' | 'user'
    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)

    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, "is_active": self.is_active,
            "created_at": _iso(self.created_at), "last_login_at": _iso(self.last_login_at),
        }


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),
        }


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