"""SQLAlchemy database models for the content catalog and job queue."""

from __future__ import annotations

from datetime import datetime

from sqlalchemy import (
    Boolean,
    DateTime,
    Float,
    Index,
    Integer,
    String,
    Text,
    func,
)
from sqlalchemy.ext.asyncio import AsyncAttrs, async_sessionmaker, create_async_engine
from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column

from content_engine.config import settings


class Base(AsyncAttrs, DeclarativeBase):
    pass


class Character(Base):
    __tablename__ = "characters"

    id: Mapped[str] = mapped_column(String(64), primary_key=True)
    name: Mapped[str] = mapped_column(String(128), nullable=False)
    trigger_word: Mapped[str] = mapped_column(String(128), nullable=False)
    lora_filename: Mapped[str] = mapped_column(String(256), nullable=False)
    lora_strength: Mapped[float] = mapped_column(Float, default=0.85)
    default_checkpoint: Mapped[str | None] = mapped_column(String(256))
    description: Mapped[str | None] = mapped_column(Text)
    created_at: Mapped[datetime] = mapped_column(
        DateTime, server_default=func.now()
    )


class Image(Base):
    __tablename__ = "images"

    id: Mapped[str] = mapped_column(String(36), primary_key=True)
    batch_id: Mapped[str | None] = mapped_column(String(36), index=True)
    character_id: Mapped[str | None] = mapped_column(String(64), index=True)
    template_id: Mapped[str | None] = mapped_column(String(128))
    content_rating: Mapped[str] = mapped_column(String(8), index=True)  # sfw | nsfw

    # Generation parameters
    positive_prompt: Mapped[str | None] = mapped_column(Text)
    negative_prompt: Mapped[str | None] = mapped_column(Text)
    checkpoint: Mapped[str | None] = mapped_column(String(256))
    loras_json: Mapped[str | None] = mapped_column(Text)  # JSON array
    seed: Mapped[int | None] = mapped_column(Integer)
    steps: Mapped[int | None] = mapped_column(Integer)
    cfg: Mapped[float | None] = mapped_column(Float)
    sampler: Mapped[str | None] = mapped_column(String(64))
    scheduler: Mapped[str | None] = mapped_column(String(64))
    width: Mapped[int | None] = mapped_column(Integer)
    height: Mapped[int | None] = mapped_column(Integer)

    # Searchable variation attributes
    pose: Mapped[str | None] = mapped_column(String(128))
    outfit: Mapped[str | None] = mapped_column(String(128))
    emotion: Mapped[str | None] = mapped_column(String(128))
    camera_angle: Mapped[str | None] = mapped_column(String(128))
    lighting: Mapped[str | None] = mapped_column(String(128))
    scene: Mapped[str | None] = mapped_column(String(128))

    # File info
    file_path: Mapped[str] = mapped_column(String(512), nullable=False)
    file_hash: Mapped[str | None] = mapped_column(String(64))
    file_size: Mapped[int | None] = mapped_column(Integer)
    generation_backend: Mapped[str | None] = mapped_column(String(32))  # local | cloud
    comfyui_prompt_id: Mapped[str | None] = mapped_column(String(36))
    generation_time_seconds: Mapped[float | None] = mapped_column(Float)

    # Quality and publishing
    quality_score: Mapped[float | None] = mapped_column(Float)
    is_approved: Mapped[bool] = mapped_column(Boolean, default=False)
    is_published: Mapped[bool] = mapped_column(Boolean, default=False)
    published_platform: Mapped[str | None] = mapped_column(String(64))
    published_at: Mapped[datetime | None] = mapped_column(DateTime)
    scheduled_at: Mapped[datetime | None] = mapped_column(DateTime)

    created_at: Mapped[datetime] = mapped_column(
        DateTime, server_default=func.now()
    )

    __table_args__ = (
        Index("idx_images_approved", "is_approved", postgresql_where=(is_approved == True)),  # noqa: E712
        Index(
            "idx_images_unpublished",
            "is_published",
            "is_approved",
        ),
    )


class GenerationJob(Base):
    __tablename__ = "generation_jobs"

    id: Mapped[str] = mapped_column(String(36), primary_key=True)
    batch_id: Mapped[str | None] = mapped_column(String(36), index=True)
    character_id: Mapped[str | None] = mapped_column(String(64))
    template_id: Mapped[str | None] = mapped_column(String(128))
    content_rating: Mapped[str | None] = mapped_column(String(8))
    variables_json: Mapped[str | None] = mapped_column(Text)
    workflow_json: Mapped[str | None] = mapped_column(Text)
    backend: Mapped[str | None] = mapped_column(String(32))  # local | replicate | runpod
    status: Mapped[str] = mapped_column(
        String(16), default="pending", index=True
    )  # pending | queued | running | completed | failed
    comfyui_prompt_id: Mapped[str | None] = mapped_column(String(36))
    cloud_job_id: Mapped[str | None] = mapped_column(String(128))
    result_image_id: Mapped[str | None] = mapped_column(String(36))
    error_message: Mapped[str | None] = mapped_column(Text)
    created_at: Mapped[datetime] = mapped_column(
        DateTime, server_default=func.now()
    )
    started_at: Mapped[datetime | None] = mapped_column(DateTime)
    completed_at: Mapped[datetime | None] = mapped_column(DateTime)


class ScheduledPost(Base):
    __tablename__ = "scheduled_posts"

    id: Mapped[str] = mapped_column(String(36), primary_key=True)
    image_id: Mapped[str] = mapped_column(String(36), nullable=False)
    platform: Mapped[str] = mapped_column(String(64), nullable=False)
    scheduled_at: Mapped[datetime] = mapped_column(DateTime, nullable=False)
    caption: Mapped[str | None] = mapped_column(Text)
    is_teaser: Mapped[bool] = mapped_column(Boolean, default=False)
    status: Mapped[str] = mapped_column(
        String(16), default="pending"
    )  # pending | published | failed | cancelled
    published_at: Mapped[datetime | None] = mapped_column(DateTime)
    error_message: Mapped[str | None] = mapped_column(Text)
    created_at: Mapped[datetime] = mapped_column(
        DateTime, server_default=func.now()
    )

    __table_args__ = (
        Index("idx_scheduled_pending", "status", "scheduled_at"),
    )


class TrainingJob(Base):
    __tablename__ = "training_jobs"

    id: Mapped[str] = mapped_column(String(36), primary_key=True)
    name: Mapped[str] = mapped_column(String(128), nullable=False)
    status: Mapped[str] = mapped_column(String(32), default="pending", index=True)
    progress: Mapped[float] = mapped_column(Float, default=0.0)
    current_epoch: Mapped[int] = mapped_column(Integer, default=0)
    total_epochs: Mapped[int] = mapped_column(Integer, default=0)
    current_step: Mapped[int] = mapped_column(Integer, default=0)
    total_steps: Mapped[int] = mapped_column(Integer, default=0)
    loss: Mapped[float | None] = mapped_column(Float)
    started_at: Mapped[float | None] = mapped_column(Float)
    completed_at: Mapped[float | None] = mapped_column(Float)
    output_path: Mapped[str | None] = mapped_column(String(512))
    error: Mapped[str | None] = mapped_column(Text)
    log_text: Mapped[str | None] = mapped_column(Text)  # newline-separated log lines
    pod_id: Mapped[str | None] = mapped_column(String(64))
    gpu_type: Mapped[str | None] = mapped_column(String(64))
    backend: Mapped[str] = mapped_column(String(16), default="runpod")
    base_model: Mapped[str | None] = mapped_column(String(64))
    model_type: Mapped[str | None] = mapped_column(String(16))
    trigger_word: Mapped[str | None] = mapped_column(String(128))
    image_upload_dir: Mapped[str | None] = mapped_column(String(512))
    created_at: Mapped[datetime] = mapped_column(
        DateTime, server_default=func.now()
    )


# --- Engine / Session factories ---

# Ensure database directories exist (critical for HF Spaces first run)
import logging as _logging
from pathlib import Path as _Path
_db_url = settings.database.url
_db_path = _db_url.replace("sqlite+aiosqlite:///", "")
_db_dir = _Path(_db_path).parent
_db_dir.mkdir(parents=True, exist_ok=True)
_logging.getLogger(__name__).info("DB path: %s (dir exists: %s)", _db_path, _db_dir.exists())

_catalog_engine = create_async_engine(
    _db_url,
    echo=False,
    connect_args={"check_same_thread": False},  # SQLite specific
)

catalog_session_factory = async_sessionmaker(
    _catalog_engine, expire_on_commit=False
)


async def init_db() -> None:
    """Create all tables. Call once at startup."""
    async with _catalog_engine.begin() as conn:
        await conn.run_sync(Base.metadata.create_all)