"""SQLAlchemy models for the Automation & Agents plugin."""

from __future__ import annotations

import uuid
from datetime import datetime
from typing import Any

from sqlalchemy import (
    Boolean,
    DateTime,
    Float,
    ForeignKey,
    Index,
    Integer,
    String,
    Text,
    UniqueConstraint,
)
from sqlalchemy.dialects.postgresql import JSONB, UUID as PGUUID
from sqlalchemy.orm import Mapped, mapped_column

from app.core.db import Base, TenantMixin


class AgentDefinition(Base, TenantMixin):
    """An AI agent definition — configures an LLM-powered agent with tools and behavior."""

    __tablename__ = "automation_agent_definitions"
    __table_args__ = (
        UniqueConstraint("tenant_id", "name", name="uq_agent_def_name"),
        Index("ix_agent_def_tenant_active", "tenant_id", "is_active"),
        Index("ix_agent_def_tenant_mode", "tenant_id", "mode"),
    )

    id: Mapped[uuid.UUID] = mapped_column(
        PGUUID(as_uuid=True), primary_key=True, default=uuid.uuid4
    )
    name: Mapped[str] = mapped_column(String(120), nullable=False)
    description: Mapped[str] = mapped_column(String(500), nullable=False, default="")
    llm_model: Mapped[str] = mapped_column(
        String(100), nullable=False, default="ollama/deepseek-v4-flash"
    )
    system_prompt: Mapped[str] = mapped_column(Text, nullable=False, default="")
    tool_ids: Mapped[list[Any]] = mapped_column(JSONB, nullable=False, default=list)
    heartbeat_interval_seconds: Mapped[int] = mapped_column(
        Integer, nullable=False, default=0
    )
    mode: Mapped[str] = mapped_column(
        String(20), nullable=False, default="reactive"
    )
    is_active: Mapped[bool] = mapped_column(Boolean, nullable=False, default=True)
    max_executions_per_hour: Mapped[int] = mapped_column(
        Integer, nullable=False, default=10
    )
    max_duration_seconds: Mapped[int] = mapped_column(
        Integer, nullable=False, default=300
    )
    budget_limit_usd: Mapped[float] = mapped_column(
        Float, nullable=False, default=1.0
    )
    created_by: Mapped[uuid.UUID | None] = mapped_column(
        PGUUID(as_uuid=True), ForeignKey("users.id", ondelete="SET NULL"), nullable=True
    )


class AgentVersion(Base, TenantMixin):
    """Versioned snapshots of agent definitions."""

    __tablename__ = "automation_agent_versions"
    __table_args__ = (
        Index("ix_agent_versions_agent", "tenant_id", "agent_id"),
        UniqueConstraint("agent_id", "version_number", name="uq_agent_version"),
    )

    id: Mapped[uuid.UUID] = mapped_column(
        PGUUID(as_uuid=True), primary_key=True, default=uuid.uuid4
    )
    agent_id: Mapped[uuid.UUID] = mapped_column(
        PGUUID(as_uuid=True),
        ForeignKey("automation_agent_definitions.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    version_number: Mapped[int] = mapped_column(Integer, nullable=False)
    snapshot: Mapped[dict[str, Any]] = mapped_column(JSONB, nullable=False)
    changed_by: Mapped[uuid.UUID | None] = mapped_column(
        PGUUID(as_uuid=True), ForeignKey("users.id", ondelete="SET NULL"), nullable=True
    )


class AutomationDefinition(Base, TenantMixin):
    """An automation workflow definition — event/schedule/manual triggered with conditions and actions."""

    __tablename__ = "automation_definitions"
    __table_args__ = (
        UniqueConstraint("tenant_id", "name", name="uq_automation_def_name"),
        Index("ix_automation_def_tenant_active", "tenant_id", "is_active"),
        Index("ix_automation_def_tenant_trigger", "tenant_id", "trigger_type"),
    )

    id: Mapped[uuid.UUID] = mapped_column(
        PGUUID(as_uuid=True), primary_key=True, default=uuid.uuid4
    )
    name: Mapped[str] = mapped_column(String(120), nullable=False)
    description: Mapped[str] = mapped_column(String(500), nullable=False, default="")
    trigger_type: Mapped[str] = mapped_column(
        String(20), nullable=False, default="manual"
    )
    trigger_config: Mapped[dict[str, Any]] = mapped_column(
        JSONB, nullable=False, default=dict
    )
    conditions: Mapped[list[Any]] = mapped_column(JSONB, nullable=False, default=list)
    actions: Mapped[list[Any]] = mapped_column(JSONB, nullable=False, default=list)
    is_active: Mapped[bool] = mapped_column(Boolean, nullable=False, default=True)
    dry_run: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)
    created_by: Mapped[uuid.UUID | None] = mapped_column(
        PGUUID(as_uuid=True), ForeignKey("users.id", ondelete="SET NULL"), nullable=True
    )


class AutomationVersion(Base, TenantMixin):
    """Versioned snapshots of automation definitions."""

    __tablename__ = "automation_versions"
    __table_args__ = (
        Index("ix_automation_versions_def", "tenant_id", "automation_id"),
        UniqueConstraint("automation_id", "version_number", name="uq_automation_version"),
    )

    id: Mapped[uuid.UUID] = mapped_column(
        PGUUID(as_uuid=True), primary_key=True, default=uuid.uuid4
    )
    automation_id: Mapped[uuid.UUID] = mapped_column(
        PGUUID(as_uuid=True),
        ForeignKey("automation_definitions.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    version_number: Mapped[int] = mapped_column(Integer, nullable=False)
    snapshot: Mapped[dict[str, Any]] = mapped_column(JSONB, nullable=False)
    changed_by: Mapped[uuid.UUID | None] = mapped_column(
        PGUUID(as_uuid=True), ForeignKey("users.id", ondelete="SET NULL"), nullable=True
    )


class AutomationCronJob(Base, TenantMixin):
    """Cron job schedule entries for agent heartbeats, automation triggers, or custom jobs."""

    __tablename__ = "automation_cron_jobs"
    __table_args__ = (
        Index("ix_cron_jobs_tenant_active", "tenant_id", "is_active"),
        Index("ix_cron_jobs_next_run", "next_run_at"),
    )

    id: Mapped[uuid.UUID] = mapped_column(
        PGUUID(as_uuid=True), primary_key=True, default=uuid.uuid4
    )
    name: Mapped[str] = mapped_column(String(120), nullable=False)
    cron_expression: Mapped[str] = mapped_column(String(100), nullable=False)
    job_type: Mapped[str] = mapped_column(
        String(50), nullable=False, default="automation_trigger"
    )
    target_id: Mapped[uuid.UUID | None] = mapped_column(
        PGUUID(as_uuid=True), nullable=True
    )
    plugin_name: Mapped[str] = mapped_column(String(80), nullable=False, default="")
    is_active: Mapped[bool] = mapped_column(Boolean, nullable=False, default=True)
    last_run_at: Mapped[datetime | None] = mapped_column(
        DateTime(timezone=True), nullable=True
    )
    next_run_at: Mapped[datetime | None] = mapped_column(
        DateTime(timezone=True), nullable=True, index=True
    )


class AgentRun(Base, TenantMixin):
    """Execution log for agent runs."""

    __tablename__ = "automation_agent_runs"
    __table_args__ = (
        Index("ix_agent_runs_agent_status", "tenant_id", "agent_id", "status"),
        Index("ix_agent_runs_started", "tenant_id", "started_at"),
    )

    id: Mapped[uuid.UUID] = mapped_column(
        PGUUID(as_uuid=True), primary_key=True, default=uuid.uuid4
    )
    agent_id: Mapped[uuid.UUID] = mapped_column(
        PGUUID(as_uuid=True),
        ForeignKey("automation_agent_definitions.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    status: Mapped[str] = mapped_column(
        String(20), nullable=False, default="pending"
    )
    started_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False
    )
    completed_at: Mapped[datetime | None] = mapped_column(
        DateTime(timezone=True), nullable=True
    )
    duration_seconds: Mapped[float | None] = mapped_column(Float, nullable=True)
    result: Mapped[str | None] = mapped_column(Text, nullable=True)
    error: Mapped[str | None] = mapped_column(Text, nullable=True)
    cost_usd: Mapped[float | None] = mapped_column(Float, nullable=True)
    trigger_type: Mapped[str] = mapped_column(
        String(20), nullable=False, default="manual"
    )
    trigger_data: Mapped[dict[str, Any]] = mapped_column(
        JSONB, nullable=False, default=dict
    )


class AutomationRun(Base, TenantMixin):
    """Execution log for automation runs."""

    __tablename__ = "automation_runs"
    __table_args__ = (
        Index("ix_automation_runs_def_status", "tenant_id", "automation_id", "status"),
        Index("ix_automation_runs_started", "tenant_id", "started_at"),
    )

    id: Mapped[uuid.UUID] = mapped_column(
        PGUUID(as_uuid=True), primary_key=True, default=uuid.uuid4
    )
    automation_id: Mapped[uuid.UUID] = mapped_column(
        PGUUID(as_uuid=True),
        ForeignKey("automation_definitions.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    status: Mapped[str] = mapped_column(
        String(20), nullable=False, default="pending"
    )
    started_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False
    )
    completed_at: Mapped[datetime | None] = mapped_column(
        DateTime(timezone=True), nullable=True
    )
    duration_seconds: Mapped[float | None] = mapped_column(Float, nullable=True)
    result: Mapped[str | None] = mapped_column(Text, nullable=True)
    error: Mapped[str | None] = mapped_column(Text, nullable=True)
    trigger_type: Mapped[str] = mapped_column(
        String(20), nullable=False, default="manual"
    )
    trigger_data: Mapped[dict[str, Any]] = mapped_column(
        JSONB, nullable=False, default=dict
    )
    dry_run: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)