"""
Background scheduler for Leopost Full.
Handles automated content generation and post publishing.
"""

import logging
from datetime import datetime

from .database import SessionLocal
from .models import EditorialPlan, Post, ScheduledPost, SocialAccount, SystemSetting
from .services.content import generate_post_text, generate_hashtags
from .services.llm import get_llm_provider
from .services.social import get_publisher

logger = logging.getLogger("leopost.scheduler")


def check_and_publish():
    """Check for posts that need publishing and publish them."""
    db = SessionLocal()
    try:
        now = datetime.utcnow()
        pending = (
            db.query(ScheduledPost)
            .filter(
                ScheduledPost.status == "pending",
                ScheduledPost.scheduled_at <= now,
            )
            .all()
        )

        for sp in pending:
            try:
                _publish_single(sp, db)
            except Exception as e:
                logger.error(f"Failed to publish post {sp.id}: {e}")
                sp.status = "failed"
                sp.error_message = str(e)
                db.commit()

    finally:
        db.close()


def _publish_single(sp: ScheduledPost, db):
    """Publish a single scheduled post."""
    post = db.query(Post).filter(Post.id == sp.post_id).first()
    if not post:
        sp.status = "failed"
        sp.error_message = "Post not found"
        db.commit()
        return

    # Find social account for this character + platform
    account = (
        db.query(SocialAccount)
        .filter(
            SocialAccount.character_id == post.character_id,
            SocialAccount.platform == sp.platform,
            SocialAccount.is_active == True,
        )
        .first()
    )

    if not account:
        sp.status = "failed"
        sp.error_message = f"No active {sp.platform} account found"
        db.commit()
        return

    sp.status = "publishing"
    db.commit()

    try:
        kwargs = {}
        if account.page_id:
            kwargs["page_id"] = account.page_id
        if hasattr(account, "extra_data") and account.extra_data:
            kwargs.update(account.extra_data)

        publisher = get_publisher(sp.platform, account.access_token, **kwargs)

        if post.video_url:
            ext_id = publisher.publish_video(post.text_content or "", post.video_url)
        elif post.image_url:
            ext_id = publisher.publish_image(post.text_content or "", post.image_url)
        else:
            text = post.text_content or ""
            if post.hashtags:
                text += "\n\n" + " ".join(post.hashtags)
            ext_id = publisher.publish_text(text)

        sp.status = "published"
        sp.published_at = datetime.utcnow()
        sp.external_post_id = ext_id
        post.status = "published"
        db.commit()

    except Exception as e:
        sp.status = "failed"
        sp.error_message = str(e)
        db.commit()
        raise


def generate_planned_content():
    """Generate content for active editorial plans."""
    db = SessionLocal()
    try:
        plans = (
            db.query(EditorialPlan)
            .filter(EditorialPlan.is_active == True)
            .all()
        )

        # Get LLM settings
        llm_setting = _get_setting(db, "llm_provider", "claude")
        api_key_setting = _get_setting(db, "llm_api_key", "")
        model_setting = _get_setting(db, "llm_model", None)

        if not api_key_setting:
            logger.warning("No LLM API key configured, skipping content generation")
            return

        for plan in plans:
            try:
                _generate_for_plan(plan, db, llm_setting, api_key_setting, model_setting)
            except Exception as e:
                logger.error(f"Failed to generate for plan {plan.id}: {e}")

    finally:
        db.close()


def _generate_for_plan(plan, db, provider_name, api_key, model):
    """Generate content for a single plan."""
    from .models import Character

    character = db.query(Character).filter(Character.id == plan.character_id).first()
    if not character:
        return

    provider = get_llm_provider(provider_name, api_key, model)
    char_dict = {
        "name": character.name,
        "niche": character.niche,
        "topics": character.topics or [],
        "tone": character.tone or "",
    }

    for platform in plan.platforms or []:
        for content_type in plan.content_types or ["text"]:
            text = generate_post_text(char_dict, provider, platform)
            hashtags = generate_hashtags(text, provider, platform)

            post = Post(
                character_id=character.id,
                content_type=content_type,
                text_content=text,
                hashtags=hashtags,
                llm_provider=provider_name,
                llm_model=model,
                platform_hint=platform,
                status="draft",
            )
            db.add(post)

    db.commit()


def _get_setting(db, key, default=None):
    """Get a system setting value."""
    setting = db.query(SystemSetting).filter(SystemSetting.key == key).first()
    if setting:
        return setting.value
    return default