"""SQLAlchemy ORM models for all persistent tables.

Centralized here so that Alembic migrations and all services share
the same model definitions.  Each service only queries the tables it owns.

Ownership:
  Auth Service      → users, refresh_tokens, subscriptions
  Chat Service      → memory_core, memory_associative, memory_episodic, memory_proactive
  Batch Agent       → local_agent_configs, cloud_agent_configs, agent_run_logs
  Billing Service   → subscriptions (shared write with Auth)
  (excluded MVP)    → storage_records, backup_metadata, plugins, plugin_*, revenue_events
"""

from __future__ import annotations

import uuid
from datetime import datetime, timezone

from sqlalchemy import (
    BigInteger,
    Boolean,
    DateTime,
    Enum,
    Float,
    ForeignKey,
    Integer,
    JSON,
    String,
    Text,
    UniqueConstraint,
    Uuid,
    func,
)
from sqlalchemy.orm import Mapped, mapped_column, relationship

from shared.db import Base

# ── Helpers ──────────────────────────────────────────────────────────────


def _uuid() -> str:
    return str(uuid.uuid4())


def _now() -> datetime:
    return datetime.now(timezone.utc)


# ── Enum types ────────────────────────────────────────────────────────────

TierEnum = Enum("free", "pro", "power", "team", name="billing_tier")
PluginStatusEnum = Enum("pending_review", "approved", "rejected", name="plugin_status")
ReviewDecisionEnum = Enum("approved", "rejected", name="review_decision")
AgentTypeEnum = Enum("local", "cloud", name="agent_type")
AgentStatusEnum = Enum("running", "success", "error", "partial", name="agent_run_status")
CloudProviderEnum = Enum("gmail", "teams", "outlook", name="cloud_provider")


# ── Auth models ───────────────────────────────────────────────────────────


class User(Base):
    __tablename__ = "users"

    id: Mapped[str] = mapped_column(
        Uuid(as_uuid=False), primary_key=True, default=_uuid
    )
    email: Mapped[str] = mapped_column(String(255), unique=True, nullable=False, index=True)
    name: Mapped[str | None] = mapped_column(String(100), nullable=True)
    surname: Mapped[str | None] = mapped_column(String(100), nullable=True)
    password_hash: Mapped[str] = mapped_column(String(255), nullable=False)
    tier: Mapped[str] = mapped_column(TierEnum, nullable=False, default="free")
    stripe_customer_id: Mapped[str | None] = mapped_column(String(255), nullable=True)
    encryption_key: Mapped[str | None] = mapped_column(String(64), nullable=True)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now()
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now(), onupdate=func.now()
    )

    refresh_tokens: Mapped[list[RefreshToken]] = relationship(
        back_populates="user", cascade="all, delete-orphan"
    )
    subscription: Mapped[Subscription | None] = relationship(
        back_populates="user", uselist=False, cascade="all, delete-orphan"
    )


class RefreshToken(Base):
    __tablename__ = "refresh_tokens"

    id: Mapped[str] = mapped_column(
        Uuid(as_uuid=False), primary_key=True, default=_uuid
    )
    user_id: Mapped[str] = mapped_column(
        Uuid(as_uuid=False), ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True
    )
    token_hash: Mapped[str] = mapped_column(String(64), unique=True, nullable=False, index=True)
    expires_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now()
    )

    user: Mapped[User] = relationship(back_populates="refresh_tokens")


class Subscription(Base):
    __tablename__ = "subscriptions"

    id: Mapped[str] = mapped_column(
        Uuid(as_uuid=False), primary_key=True, default=_uuid
    )
    user_id: Mapped[str] = mapped_column(
        Uuid(as_uuid=False), ForeignKey("users.id", ondelete="CASCADE"),
        nullable=False, unique=True, index=True
    )
    stripe_subscription_id: Mapped[str | None] = mapped_column(String(255), nullable=True, index=True)
    tier: Mapped[str] = mapped_column(TierEnum, nullable=False, default="free")
    status: Mapped[str] = mapped_column(String(50), nullable=False, default="free")
    current_period_end: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now()
    )

    user: Mapped[User] = relationship(back_populates="subscription")


# ── Storage models (excluded from MVP, kept for Alembic) ──────────────


class StorageRecord(Base):
    __tablename__ = "storage_records"

    id: Mapped[str] = mapped_column(
        Uuid(as_uuid=False), primary_key=True, default=_uuid
    )
    user_id: Mapped[str] = mapped_column(
        Uuid(as_uuid=False), ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True
    )
    table_name: Mapped[str] = mapped_column(String(100), nullable=False)
    s3_key: Mapped[str] = mapped_column(String(500), nullable=False)
    checksum: Mapped[str] = mapped_column(String(64), nullable=False)
    size_bytes: Mapped[int] = mapped_column(Integer, nullable=False)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now()
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now(), onupdate=func.now()
    )


class BackupMetadata(Base):
    __tablename__ = "backup_metadata"

    id: Mapped[str] = mapped_column(
        Uuid(as_uuid=False), primary_key=True, default=_uuid
    )
    user_id: Mapped[str] = mapped_column(
        Uuid(as_uuid=False), ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True
    )
    s3_key: Mapped[str] = mapped_column(String(500), nullable=False)
    version: Mapped[int] = mapped_column(Integer, nullable=False)
    timestamp: Mapped[int] = mapped_column(BigInteger, nullable=False)
    checksum: Mapped[str] = mapped_column(String(64), nullable=False)
    size_bytes: Mapped[int] = mapped_column(Integer, nullable=False)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now()
    )


# ── Plugin models (excluded from MVP, kept for Alembic) ───────────────


class Plugin(Base):
    __tablename__ = "plugins"

    id: Mapped[str] = mapped_column(String(255), primary_key=True)
    name: Mapped[str] = mapped_column(String(255), nullable=False)
    description: Mapped[str] = mapped_column(Text, nullable=False, default="")
    version: Mapped[str] = mapped_column(String(50), nullable=False, default="1.0.0")
    author_id: Mapped[str | None] = mapped_column(
        Uuid(as_uuid=False), ForeignKey("users.id", ondelete="SET NULL"), nullable=True
    )
    author_name: Mapped[str] = mapped_column(String(255), nullable=False, default="")
    category: Mapped[str] = mapped_column(String(100), nullable=False, default="")
    price_cents: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    permissions: Mapped[str] = mapped_column(Text, nullable=False, default="[]")
    status: Mapped[str] = mapped_column(PluginStatusEnum, nullable=False, default="pending_review")
    s3_package_key: Mapped[str | None] = mapped_column(String(500), nullable=True)
    install_count: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    avg_rating: Mapped[float] = mapped_column(Float, nullable=False, default=0.0)
    rejection_reason: Mapped[str | None] = mapped_column(Text, nullable=True)
    submitted_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now()
    )
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now()
    )

    installations: Mapped[list[PluginInstallation]] = relationship(
        back_populates="plugin", cascade="all, delete-orphan"
    )
    reviews: Mapped[list[PluginReview]] = relationship(
        back_populates="plugin", cascade="all, delete-orphan"
    )
    revenue_events: Mapped[list[RevenueEvent]] = relationship(
        back_populates="plugin", cascade="all, delete-orphan"
    )


class PluginInstallation(Base):
    __tablename__ = "plugin_installations"
    __table_args__ = (UniqueConstraint("plugin_id", "user_id", name="uq_plugin_user"),)

    id: Mapped[str] = mapped_column(
        Uuid(as_uuid=False), primary_key=True, default=_uuid
    )
    plugin_id: Mapped[str] = mapped_column(
        String(255), ForeignKey("plugins.id", ondelete="CASCADE"), nullable=False, index=True
    )
    user_id: Mapped[str] = mapped_column(
        Uuid(as_uuid=False), ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True
    )
    installed_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now()
    )

    plugin: Mapped[Plugin] = relationship(back_populates="installations")


class PluginReview(Base):
    __tablename__ = "plugin_reviews"

    id: Mapped[str] = mapped_column(
        Uuid(as_uuid=False), primary_key=True, default=_uuid
    )
    plugin_id: Mapped[str] = mapped_column(
        String(255), ForeignKey("plugins.id", ondelete="CASCADE"), nullable=False, index=True
    )
    reviewer_id: Mapped[str | None] = mapped_column(
        Uuid(as_uuid=False), ForeignKey("users.id", ondelete="SET NULL"), nullable=True
    )
    decision: Mapped[str] = mapped_column(ReviewDecisionEnum, nullable=False)
    notes: Mapped[str | None] = mapped_column(Text, nullable=True)
    reviewed_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now()
    )
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now()
    )

    plugin: Mapped[Plugin] = relationship(back_populates="reviews")


class RevenueEvent(Base):
    __tablename__ = "revenue_events"

    id: Mapped[str] = mapped_column(
        Uuid(as_uuid=False), primary_key=True, default=_uuid
    )
    plugin_id: Mapped[str] = mapped_column(
        String(255), ForeignKey("plugins.id", ondelete="CASCADE"), nullable=False, index=True
    )
    user_id: Mapped[str] = mapped_column(
        Uuid(as_uuid=False), ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True
    )
    amount_cents: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    developer_share_cents: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    stripe_transfer_id: Mapped[str | None] = mapped_column(String(255), nullable=True)
    paid_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now()
    )

    plugin: Mapped[Plugin] = relationship(back_populates="revenue_events")


# ── Agent models ──────────────────────────────────────────────────────────


class LocalAgentConfig(Base):
    __tablename__ = "local_agent_configs"

    id: Mapped[str] = mapped_column(
        Uuid(as_uuid=False), primary_key=True, default=_uuid
    )
    user_id: Mapped[str] = mapped_column(
        Uuid(as_uuid=False), ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True
    )
    device_id: Mapped[str] = mapped_column(String(255), nullable=False)
    name: Mapped[str] = mapped_column(String(255), nullable=False)
    directory_paths: Mapped[list] = mapped_column(JSON, nullable=False, default=list)
    data_types: Mapped[list] = mapped_column(JSON, nullable=False, default=list)
    prompt_template: Mapped[str] = mapped_column(Text, nullable=False, default="")
    file_extensions: Mapped[list] = mapped_column(JSON, nullable=False, default=list)
    schedule_cron: Mapped[str] = mapped_column(String(100), nullable=False, default="0 */6 * * *")
    enabled: Mapped[bool] = mapped_column(Boolean, nullable=False, default=True)
    last_run_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now()
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now(), onupdate=func.now()
    )

    run_logs: Mapped[list[AgentRunLog]] = relationship(
        back_populates="local_agent",
        primaryjoin="and_(AgentRunLog.agent_id == LocalAgentConfig.id, AgentRunLog.agent_type == 'local')",
        foreign_keys="AgentRunLog.agent_id",
        cascade="all, delete-orphan",
        overlaps="run_logs,cloud_agent",
    )


class CloudAgentConfig(Base):
    __tablename__ = "cloud_agent_configs"

    id: Mapped[str] = mapped_column(
        Uuid(as_uuid=False), primary_key=True, default=_uuid
    )
    user_id: Mapped[str] = mapped_column(
        Uuid(as_uuid=False), ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True
    )
    provider: Mapped[str] = mapped_column(CloudProviderEnum, nullable=False)
    name: Mapped[str] = mapped_column(String(255), nullable=False)
    data_types: Mapped[list] = mapped_column(JSON, nullable=False, default=list)
    prompt_template: Mapped[str] = mapped_column(Text, nullable=False, default="")
    oauth_token_encrypted: Mapped[str | None] = mapped_column(Text, nullable=True)
    filter_config: Mapped[dict | None] = mapped_column(JSON, nullable=True)
    schedule_cron: Mapped[str] = mapped_column(String(100), nullable=False, default="0 */6 * * *")
    enabled: Mapped[bool] = mapped_column(Boolean, nullable=False, default=True)
    last_run_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now()
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now(), onupdate=func.now()
    )

    run_logs: Mapped[list[AgentRunLog]] = relationship(
        back_populates="cloud_agent",
        primaryjoin="and_(AgentRunLog.agent_id == CloudAgentConfig.id, AgentRunLog.agent_type == 'cloud')",
        foreign_keys="AgentRunLog.agent_id",
        cascade="all, delete-orphan",
        overlaps="run_logs,local_agent",
    )


class AgentRunLog(Base):
    __tablename__ = "agent_run_logs"

    id: Mapped[str] = mapped_column(
        Uuid(as_uuid=False), primary_key=True, default=_uuid
    )
    agent_id: Mapped[str] = mapped_column(String(255), nullable=False, index=True)
    agent_type: Mapped[str] = mapped_column(AgentTypeEnum, nullable=False)
    user_id: Mapped[str] = mapped_column(
        Uuid(as_uuid=False), ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True
    )
    status: Mapped[str] = mapped_column(AgentStatusEnum, nullable=False, default="running")
    items_processed: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    items_created: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    errors: Mapped[list | None] = mapped_column(JSON, nullable=True)
    started_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now()
    )
    completed_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)

    local_agent: Mapped[LocalAgentConfig | None] = relationship(
        back_populates="run_logs",
        primaryjoin="and_(AgentRunLog.agent_id == LocalAgentConfig.id, AgentRunLog.agent_type == 'local')",
        foreign_keys="AgentRunLog.agent_id",
        overlaps="run_logs,cloud_agent",
    )
    cloud_agent: Mapped[CloudAgentConfig | None] = relationship(
        back_populates="run_logs",
        primaryjoin="and_(AgentRunLog.agent_id == CloudAgentConfig.id, AgentRunLog.agent_type == 'cloud')",
        foreign_keys="AgentRunLog.agent_id",
        overlaps="run_logs,local_agent",
    )


# ── Memory models ─────────────────────────────────────────────────────────


class MemoryCore(Base):
    """Per-user persistent key/value preferences, encrypted at rest."""

    __tablename__ = "memory_core"

    id: Mapped[str] = mapped_column(Uuid(as_uuid=False), primary_key=True, default=_uuid)
    user_id: Mapped[str] = mapped_column(
        Uuid(as_uuid=False), ForeignKey("users.id", ondelete="CASCADE"),
        nullable=False, index=True,
    )
    key: Mapped[str] = mapped_column(String(255), nullable=False)
    value_encrypted: Mapped[str] = mapped_column(Text, nullable=False)
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now(), onupdate=func.now()
    )


class MemoryAssociative(Base):
    """Per-user semantic memory: encrypted content + pgvector embedding."""

    __tablename__ = "memory_associative"

    id: Mapped[str] = mapped_column(Uuid(as_uuid=False), primary_key=True, default=_uuid)
    user_id: Mapped[str] = mapped_column(
        Uuid(as_uuid=False), ForeignKey("users.id", ondelete="CASCADE"),
        nullable=False, index=True,
    )
    content_encrypted: Mapped[str] = mapped_column(Text, nullable=False)
    embedding: Mapped[list | None] = mapped_column(JSON, nullable=True)
    entity_type: Mapped[str | None] = mapped_column(String(100), nullable=True)
    entity_id: Mapped[str | None] = mapped_column(String(255), nullable=True)
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now(), onupdate=func.now()
    )


class MemoryEpisodic(Base):
    """Per-user session summaries, encrypted at rest."""

    __tablename__ = "memory_episodic"

    id: Mapped[str] = mapped_column(Uuid(as_uuid=False), primary_key=True, default=_uuid)
    user_id: Mapped[str] = mapped_column(
        Uuid(as_uuid=False), ForeignKey("users.id", ondelete="CASCADE"),
        nullable=False, index=True,
    )
    summary_encrypted: Mapped[str] = mapped_column(Text, nullable=False)
    session_id: Mapped[str] = mapped_column(String(255), nullable=False, index=True)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now()
    )


class MemoryProactive(Base):
    """Per-user inferred behavioral patterns, encrypted at rest."""

    __tablename__ = "memory_proactive"

    id: Mapped[str] = mapped_column(Uuid(as_uuid=False), primary_key=True, default=_uuid)
    user_id: Mapped[str] = mapped_column(
        Uuid(as_uuid=False), ForeignKey("users.id", ondelete="CASCADE"),
        nullable=False, index=True,
    )
    pattern_encrypted: Mapped[str] = mapped_column(Text, nullable=False)
    confidence: Mapped[float] = mapped_column(Float, nullable=False, default=0.5)
    source: Mapped[str] = mapped_column(String(50), nullable=False, default="inferred")
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now()
    )