import uuid
from datetime import datetime, timezone
from typing import Optional, TYPE_CHECKING
from sqlalchemy import String, Text, DateTime, ForeignKey, Boolean, Integer, Enum as SAEnum, text
from sqlalchemy.orm import Mapped, mapped_column, relationship
from sqlalchemy.dialects.postgresql import UUID, JSONB
from app.core.database import Base

if TYPE_CHECKING:
    from app.models.user import User
    from app.models.team import Team
    from app.models.session import Session


class ScriptCategory(Base):
    __tablename__ = "script_categories"

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    name: Mapped[str] = mapped_column(String(100), nullable=False)
    slug: Mapped[str] = mapped_column(String(100), nullable=False, unique=True, index=True)
    description: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
    icon: Mapped[Optional[str]] = mapped_column(String(50), nullable=True)
    sort_order: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    is_active: Mapped[bool] = mapped_column(Boolean, nullable=False, default=True)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), default=lambda: datetime.now(timezone.utc)
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        default=lambda: datetime.now(timezone.utc),
        onupdate=lambda: datetime.now(timezone.utc),
    )

    templates: Mapped[list["ScriptTemplate"]] = relationship("ScriptTemplate", back_populates="category")


class ScriptTemplate(Base):
    __tablename__ = "script_templates"

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    category_id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True), ForeignKey("script_categories.id", ondelete="RESTRICT"), nullable=False, index=True
    )
    team_id: Mapped[Optional[uuid.UUID]] = mapped_column(
        UUID(as_uuid=True), ForeignKey("teams.id", ondelete="CASCADE"), nullable=True, index=True
    )
    account_id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True),
        ForeignKey("accounts.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    created_by: Mapped[Optional[uuid.UUID]] = mapped_column(
        UUID(as_uuid=True), ForeignKey("users.id", ondelete="SET NULL"), nullable=True
    )
    name: Mapped[str] = mapped_column(String(200), nullable=False)
    slug: Mapped[str] = mapped_column(String(200), nullable=False, unique=True, index=True)
    description: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
    use_case: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
    script_body: Mapped[str] = mapped_column(Text, nullable=False)
    language: Mapped[Optional[str]] = mapped_column(
        String(30), nullable=True, default="powershell",
        comment="Script language: powershell, bash, python",
    )
    parameters_schema: Mapped[dict] = mapped_column(JSONB, nullable=False, default=dict, server_default=text("'{}'::jsonb"))
    default_values: Mapped[dict] = mapped_column(JSONB, nullable=False, default=dict, server_default=text("'{}'::jsonb"))
    validation_rules: Mapped[dict] = mapped_column(JSONB, nullable=False, default=dict, server_default=text("'{}'::jsonb"))
    tags: Mapped[list] = mapped_column(JSONB, nullable=False, default=list, server_default=text("'[]'::jsonb"))
    complexity: Mapped[str] = mapped_column(
        SAEnum("beginner", "intermediate", "advanced", name="script_complexity"), nullable=False, default="beginner"
    )
    estimated_runtime: Mapped[Optional[str]] = mapped_column(String(50), nullable=True)
    requires_elevation: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False, server_default=text("false"))
    requires_modules: Mapped[list] = mapped_column(JSONB, nullable=False, default=list, server_default=text("'[]'::jsonb"))
    version: Mapped[int] = mapped_column(Integer, nullable=False, default=1, server_default=text("1"))
    is_verified: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False, server_default=text("false"))
    is_active: Mapped[bool] = mapped_column(Boolean, nullable=False, default=True, server_default=text("true"))
    is_gallery_featured: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False, server_default=text("false"), index=True)
    gallery_sort_order: Mapped[int] = mapped_column(Integer, nullable=False, default=0, server_default=text("0"))
    usage_count: Mapped[int] = mapped_column(Integer, nullable=False, default=0, server_default=text("0"))
    # ── Provenance (Phase 1 — FlowPilot migration) ──
    # Populated when a template is promoted from a post-resolve draft_templates row.
    # Powers the Script Library provenance chip:
    # "generated from CW #X · resolved by Y · used N times"
    source_session_id: Mapped[Optional[uuid.UUID]] = mapped_column(
        UUID(as_uuid=True), ForeignKey("ai_sessions.id"), nullable=True,
    )
    source_user_id: Mapped[Optional[uuid.UUID]] = mapped_column(
        UUID(as_uuid=True), ForeignKey("users.id"), nullable=True,
    )
    source_ticket_ref: Mapped[Optional[str]] = mapped_column(
        String(64), nullable=True,
        comment="Human-readable PSA ticket ref for display, e.g. 'CW #48307'",
    )
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), default=lambda: datetime.now(timezone.utc)
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        default=lambda: datetime.now(timezone.utc),
        onupdate=lambda: datetime.now(timezone.utc),
    )

    category: Mapped["ScriptCategory"] = relationship("ScriptCategory", back_populates="templates")
    team: Mapped[Optional["Team"]] = relationship("Team")
    creator: Mapped[Optional["User"]] = relationship("User", foreign_keys=[created_by])
    generations: Mapped[list["ScriptGeneration"]] = relationship("ScriptGeneration", back_populates="template")


class ScriptGeneration(Base):
    __tablename__ = "script_generations"

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    template_id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True), ForeignKey("script_templates.id", ondelete="RESTRICT"), nullable=False, index=True
    )
    user_id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True), ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True
    )
    account_id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True),
        ForeignKey("accounts.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    team_id: Mapped[Optional[uuid.UUID]] = mapped_column(
        UUID(as_uuid=True), ForeignKey("teams.id", ondelete="SET NULL"), nullable=True, index=True
    )
    session_id: Mapped[Optional[uuid.UUID]] = mapped_column(
        UUID(as_uuid=True), ForeignKey("sessions.id", ondelete="SET NULL"), nullable=True, index=True
    )
    ai_session_id: Mapped[Optional[uuid.UUID]] = mapped_column(
        UUID(as_uuid=True), ForeignKey("ai_sessions.id", ondelete="SET NULL"), nullable=True, index=True,
        comment="FlowPilot AI session that triggered this generation",
    )
    parameters_used: Mapped[dict] = mapped_column(JSONB, nullable=False, default=dict)
    generated_script: Mapped[str] = mapped_column(Text, nullable=False)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), default=lambda: datetime.now(timezone.utc)
    )

    template: Mapped["ScriptTemplate"] = relationship("ScriptTemplate", back_populates="generations")
    user: Mapped["User"] = relationship("User")