"""Project models for event/rental project management."""

import uuid
from datetime import datetime
from typing import Optional

from sqlalchemy import String, DateTime, ForeignKey, func, Float, Integer, Text
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.db.base import Base


class Project(Base):
    """Represents a rental/event project within a tenant account."""

    __tablename__ = "projects"

    id: Mapped[str] = mapped_column(
        String(36), primary_key=True, default=lambda: str(uuid.uuid4())
    )
    account_id: Mapped[str] = mapped_column(
        String(36), ForeignKey("accounts.id", ondelete="CASCADE"), nullable=False
    )
    name: Mapped[str] = mapped_column(String(255), nullable=False)
    description: Mapped[str | None] = mapped_column(Text, nullable=True)
    status: Mapped[str] = mapped_column(
        String(20), nullable=False, default="draft"
    )  # draft, confirmed, in_progress, completed, cancelled
    start_date: Mapped[datetime | None] = mapped_column(
        DateTime(timezone=True), nullable=True
    )
    end_date: Mapped[datetime | None] = mapped_column(
        DateTime(timezone=True), nullable=True
    )
    budget: Mapped[float | None] = mapped_column(Float, nullable=True)
    total_costs: Mapped[float] = mapped_column(Float, nullable=False, default=0.0)
    notes: Mapped[str | None] = mapped_column(Text, nullable=True)
    custom_fields: Mapped[str | None] = mapped_column(
        Text, nullable=True
    )  # JSON string for flexible custom fields
    custom_field_defs: Mapped[str | None] = mapped_column(
        Text, nullable=True
    )  # JSON string for custom field definitions

    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now(), nullable=False
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        server_default=func.now(),
        onupdate=func.now(),
        nullable=False,
    )

    # Relationships
    account: Mapped["Account"] = relationship("Account", back_populates="projects")
    sub_projects: Mapped[list["SubProject"]] = relationship(
        "SubProject", back_populates="project", cascade="all, delete-orphan"
    )
    function_groups: Mapped[list["ProjectFunctionGroup"]] = relationship(
        "ProjectFunctionGroup", back_populates="project", cascade="all, delete-orphan"
    )

    def __repr__(self) -> str:
        return f"<Project {self.name} ({self.status})>"


class SubProject(Base):
    """Represents a sub-project with self-referential parent hierarchy."""

    __tablename__ = "sub_projects"

    id: Mapped[str] = mapped_column(
        String(36), primary_key=True, default=lambda: str(uuid.uuid4())
    )
    name: Mapped[str] = mapped_column(String(255), nullable=False)
    project_id: Mapped[str] = mapped_column(
        String(36), ForeignKey("projects.id", ondelete="CASCADE"), nullable=False
    )
    parent_id: Mapped[str | None] = mapped_column(
        String(36), ForeignKey("sub_projects.id", ondelete="CASCADE"), nullable=True
    )
    sort_order: Mapped[int] = mapped_column(Integer, nullable=False, default=0)

    # Relationships
    project: Mapped["Project"] = relationship("Project", back_populates="sub_projects")
    parent: Mapped[Optional["SubProject"]] = relationship(
        "SubProject", remote_side="SubProject.id", back_populates="children"
    )
    children: Mapped[list["SubProject"]] = relationship(
        "SubProject", back_populates="parent", cascade="all, delete-orphan"
    )

    def __repr__(self) -> str:
        return f"<SubProject {self.name}>"


class ProjectFunctionGroup(Base):
    """Groups project functions under a project."""

    __tablename__ = "project_function_groups"

    id: Mapped[str] = mapped_column(
        String(36), primary_key=True, default=lambda: str(uuid.uuid4())
    )
    name: Mapped[str] = mapped_column(String(255), nullable=False)
    project_id: Mapped[str] = mapped_column(
        String(36), ForeignKey("projects.id", ondelete="CASCADE"), nullable=False
    )
    sort_order: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    start_date: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    end_date: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)

    # Relationships
    project: Mapped["Project"] = relationship(
        "Project", back_populates="function_groups"
    )
    functions: Mapped[list["ProjectFunction"]] = relationship(
        "ProjectFunction", back_populates="function_group", cascade="all, delete-orphan"
    )

    def __repr__(self) -> str:
        return f"<ProjectFunctionGroup {self.name}>"


class ProjectFunction(Base):
    """Individual function/line-item within a function group."""

    __tablename__ = "project_functions"

    id: Mapped[str] = mapped_column(
        String(36), primary_key=True, default=lambda: str(uuid.uuid4())
    )
    name: Mapped[str] = mapped_column(String(255), nullable=False)
    function_group_id: Mapped[str] = mapped_column(
        String(36),
        ForeignKey("project_function_groups.id", ondelete="CASCADE"),
        nullable=False,
    )
    function_type: Mapped[str] = mapped_column(String(50), nullable=False, default='crew')
    quantity: Mapped[float] = mapped_column(Float, nullable=False, default=1.0)
    daily_costs: Mapped[float] = mapped_column(Float, nullable=False, default=0.0)
    total_costs: Mapped[float] = mapped_column(Float, nullable=False, default=0.0)
    sort_order: Mapped[int] = mapped_column(Integer, nullable=False, default=0)

    # Relationships
    function_group: Mapped["ProjectFunctionGroup"] = relationship(
        "ProjectFunctionGroup", back_populates="functions"
    )

    def __repr__(self) -> str:
        return f"<ProjectFunction {self.name} x{self.quantity}>"