import uuid
from datetime import datetime

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

from app.database import Base, JSONType


class AgentRegistry(Base):
    __tablename__ = "agent_registry"

    id: Mapped[uuid.UUID] = mapped_column(
        Uuid(as_uuid=True),
        primary_key=True,
        default=uuid.uuid4,
    )
    name: Mapped[str] = mapped_column(String(50), unique=True, nullable=False)
    display_name: Mapped[str | None] = mapped_column(String(100), nullable=True)
    agent_type: Mapped[str] = mapped_column(String(50), nullable=False)
    description: Mapped[str | None] = mapped_column(Text, nullable=True)
    version: Mapped[str | None] = mapped_column(String(20), nullable=True)
    endpoint: Mapped[str | None] = mapped_column(String(500), nullable=True)
    status: Mapped[str] = mapped_column(String(20), server_default="offline", nullable=False)
    capabilities: Mapped[dict | None] = mapped_column(JSONType, nullable=True)
    last_heartbeat: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    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
    configs: Mapped[list["AgentConfig"]] = relationship(
        "AgentConfig", back_populates="agent", cascade="all, delete-orphan"
    )
    tasks: Mapped[list["AgentTask"]] = relationship(
        "AgentTask", back_populates="agent"
    )
    task_logs: Mapped[list["AgentTaskLog"]] = relationship(
        "AgentTaskLog", back_populates="agent"
    )

    __table_args__ = (
        Index("idx_agent_registry_name", "name"),
        Index("idx_agent_registry_agent_type", "agent_type"),
        Index("idx_agent_registry_status", "status"),
    )


class AgentConfig(Base):
    __tablename__ = "agent_configs"

    id: Mapped[uuid.UUID] = mapped_column(
        Uuid(as_uuid=True),
        primary_key=True,
        default=uuid.uuid4,
    )
    agent_id: Mapped[uuid.UUID] = mapped_column(
        Uuid(as_uuid=True),
        ForeignKey("agent_registry.id", ondelete="CASCADE"),
        nullable=False,
    )
    config_key: Mapped[str] = mapped_column(String(100), nullable=False)
    config_value: Mapped[dict] = mapped_column(JSONType, nullable=False)
    description: Mapped[str | None] = mapped_column(String(500), nullable=True)
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        server_default=func.now(),
        onupdate=func.now(),
        nullable=False,
    )
    updated_by: Mapped[str | None] = mapped_column(
        String(36),
        ForeignKey("users.id", ondelete="SET NULL"),
        nullable=True,
    )

    # Relationships
    agent: Mapped["AgentRegistry"] = relationship(
        "AgentRegistry", back_populates="configs"
    )
    updater: Mapped["User | None"] = relationship(
        "User", foreign_keys=[updated_by]
    )

    __table_args__ = (
        Index("idx_agent_configs_agent_id", "agent_id"),
        Index("idx_agent_configs_agent_key", "agent_id", "config_key", unique=True),
    )


class AgentTask(Base):
    __tablename__ = "agent_tasks"

    id: Mapped[uuid.UUID] = mapped_column(
        Uuid(as_uuid=True),
        primary_key=True,
        default=uuid.uuid4,
    )
    agent_id: Mapped[uuid.UUID] = mapped_column(
        Uuid(as_uuid=True),
        ForeignKey("agent_registry.id", ondelete="CASCADE"),
        nullable=False,
    )
    task_type: Mapped[str] = mapped_column(String(50), nullable=False)
    status: Mapped[str] = mapped_column(String(20), server_default="pending", nullable=False)
    priority: Mapped[int] = mapped_column(Integer, server_default="0", nullable=False)
    input_data: Mapped[dict | None] = mapped_column(JSONType, nullable=True)
    output_data: Mapped[dict | None] = mapped_column(JSONType, nullable=True)
    error_message: Mapped[str | None] = mapped_column(Text, nullable=True)
    created_by: Mapped[str | None] = mapped_column(
        String(36),
        ForeignKey("users.id", ondelete="SET NULL"),
        nullable=True,
    )
    organization_id: Mapped[uuid.UUID] = mapped_column(
        Uuid(as_uuid=True),
        ForeignKey("organizations.id", ondelete="CASCADE"),
        nullable=False,
    )
    project_id: Mapped[uuid.UUID | None] = mapped_column(
        Uuid(as_uuid=True),
        ForeignKey("lifecycle_projects.id", ondelete="SET NULL"),
        nullable=True,
    )
    scheduled_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    started_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    completed_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        server_default=func.now(),
        nullable=False,
    )

    # Relationships
    agent: Mapped["AgentRegistry"] = relationship(
        "AgentRegistry", back_populates="tasks"
    )
    organization: Mapped["Organization"] = relationship(
        "Organization", back_populates="agents"
    )
    project: Mapped["LifecycleProject | None"] = relationship(
        "LifecycleProject"
    )
    creator: Mapped["User | None"] = relationship(
        "User", foreign_keys=[created_by]
    )
    logs: Mapped[list["AgentTaskLog"]] = relationship(
        "AgentTaskLog", back_populates="task", cascade="all, delete-orphan"
    )

    __table_args__ = (
        Index("idx_agent_tasks_agent_id", "agent_id"),
        Index("idx_agent_tasks_status", "status"),
        Index("idx_agent_tasks_organization_id", "organization_id"),
        Index("idx_agent_tasks_project_id", "project_id"),
        Index("idx_agent_tasks_created_by", "created_by"),
        Index("idx_agent_tasks_task_type", "task_type"),
    )


class AgentTaskLog(Base):
    __tablename__ = "agent_task_logs"

    id: Mapped[uuid.UUID] = mapped_column(
        Uuid(as_uuid=True),
        primary_key=True,
        default=uuid.uuid4,
    )
    task_id: Mapped[uuid.UUID] = mapped_column(
        Uuid(as_uuid=True),
        ForeignKey("agent_tasks.id", ondelete="CASCADE"),
        nullable=False,
    )
    agent_id: Mapped[uuid.UUID] = mapped_column(
        Uuid(as_uuid=True),
        ForeignKey("agent_registry.id", ondelete="CASCADE"),
        nullable=False,
    )
    log_level: Mapped[str] = mapped_column(String(10), nullable=False)
    message: Mapped[str] = mapped_column(Text, nullable=False)
    extra_metadata: Mapped[dict | None] = mapped_column("metadata", JSONType, nullable=True)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        server_default=func.now(),
        nullable=False,
    )

    # Relationships
    task: Mapped["AgentTask"] = relationship(
        "AgentTask", back_populates="logs"
    )
    agent: Mapped["AgentRegistry"] = relationship(
        "AgentRegistry", back_populates="task_logs"
    )

    __table_args__ = (
        Index("idx_agent_task_logs_task_id", "task_id"),
        Index("idx_agent_task_logs_agent_id", "agent_id"),
        Index("idx_agent_task_logs_created_at", "created_at"),
    )