"""Creator dashboard endpoint — authenticated analytics for a linked creator.

Returns aggregate counts (videos, technique pages, key moments, search
impressions) and content lists for the logged-in creator's dashboard.
"""

import logging
from typing import Annotated

from fastapi import APIRouter, Depends, HTTPException
from sqlalchemy import func, select
from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy.orm import selectinload

from auth import get_current_user
from database import get_session
from models import (
    Creator,
    KeyMoment,
    RelatedTechniqueLink,
    SearchLog,
    SourceVideo,
    TechniquePage,
    User,
)
from schemas import (
    CreatorDashboardResponse,
    CreatorDashboardTechnique,
    CreatorDashboardVideo,
    CreatorTransparencyResponse,
    TransparencyKeyMoment,
    TransparencyRelationship,
    TransparencySourceVideo,
    TransparencyTechnique,
)

logger = logging.getLogger("chrysopedia.creator_dashboard")

router = APIRouter(prefix="/creator", tags=["creator-dashboard"])


@router.get("/dashboard", response_model=CreatorDashboardResponse)
async def get_creator_dashboard(
    current_user: Annotated[User, Depends(get_current_user)],
    db: AsyncSession = Depends(get_session),
) -> CreatorDashboardResponse:
    """Return dashboard analytics for the authenticated creator.

    Requires the user to have a linked creator_id. Returns 404 if the
    user has no linked creator profile.
    """
    if current_user.creator_id is None:
        raise HTTPException(
            status_code=404,
            detail="No creator profile linked to this account",
        )

    creator_id = current_user.creator_id

    # Verify creator exists (defensive — FK should guarantee this)
    creator = (await db.execute(
        select(Creator).where(Creator.id == creator_id)
    )).scalar_one_or_none()
    if creator is None:
        logger.error("User %s has creator_id %s but creator row missing", current_user.id, creator_id)
        raise HTTPException(
            status_code=404,
            detail="Linked creator profile not found",
        )

    # ── Aggregate counts ─────────────────────────────────────────────────

    video_count = (await db.execute(
        select(func.count()).select_from(SourceVideo)
        .where(SourceVideo.creator_id == creator_id)
    )).scalar() or 0

    technique_count = (await db.execute(
        select(func.count()).select_from(TechniquePage)
        .where(TechniquePage.creator_id == creator_id)
    )).scalar() or 0

    key_moment_count = (await db.execute(
        select(func.count()).select_from(KeyMoment)
        .join(SourceVideo, KeyMoment.source_video_id == SourceVideo.id)
        .where(SourceVideo.creator_id == creator_id)
    )).scalar() or 0

    # Search impressions: count distinct search_log rows where the query
    # exactly matches (case-insensitive) any of this creator's technique titles.
    search_impressions = (await db.execute(
        select(func.count(func.distinct(SearchLog.id)))
        .where(
            select(TechniquePage.id)
            .where(
                TechniquePage.creator_id == creator_id,
                func.lower(SearchLog.query) == func.lower(TechniquePage.title),
            )
            .correlate(SearchLog)
            .exists()
        )
    )).scalar() or 0

    # ── Content lists ────────────────────────────────────────────────────

    # Techniques with per-page key moment count
    km_count_sq = (
        select(func.count(KeyMoment.id))
        .where(KeyMoment.technique_page_id == TechniquePage.id)
        .correlate(TechniquePage)
        .scalar_subquery()
        .label("key_moment_count")
    )
    technique_rows = (await db.execute(
        select(
            TechniquePage.title,
            TechniquePage.slug,
            TechniquePage.topic_category,
            TechniquePage.created_at,
            km_count_sq,
        )
        .where(TechniquePage.creator_id == creator_id)
        .order_by(TechniquePage.created_at.desc())
    )).all()

    techniques = [
        CreatorDashboardTechnique(
            title=r.title,
            slug=r.slug,
            topic_category=r.topic_category,
            created_at=r.created_at,
            key_moment_count=r.key_moment_count or 0,
        )
        for r in technique_rows
    ]

    # Videos
    video_rows = (await db.execute(
        select(
            SourceVideo.filename,
            SourceVideo.processing_status,
            SourceVideo.created_at,
        )
        .where(SourceVideo.creator_id == creator_id)
        .order_by(SourceVideo.created_at.desc())
    )).all()

    videos = [
        CreatorDashboardVideo(
            filename=r.filename,
            processing_status=r.processing_status.value if hasattr(r.processing_status, 'value') else str(r.processing_status),
            created_at=r.created_at,
        )
        for r in video_rows
    ]

    logger.info(
        "Dashboard loaded for creator %s: %d videos, %d techniques, %d moments, %d impressions",
        creator_id, video_count, technique_count, key_moment_count, search_impressions,
    )

    return CreatorDashboardResponse(
        video_count=video_count,
        technique_count=technique_count,
        key_moment_count=key_moment_count,
        search_impressions=search_impressions,
        techniques=techniques,
        videos=videos,
    )


@router.get("/transparency", response_model=CreatorTransparencyResponse)
async def get_creator_transparency(
    current_user: Annotated[User, Depends(get_current_user)],
    db: AsyncSession = Depends(get_session),
) -> CreatorTransparencyResponse:
    """Return all entities derived from the authenticated creator's content.

    Shows technique pages, key moments, cross-reference relationships,
    source videos, and aggregated topic tags — everything the AI pipeline
    produced from this creator's uploads.
    """
    if current_user.creator_id is None:
        raise HTTPException(
            status_code=404,
            detail="No creator profile linked to this account",
        )

    creator_id = current_user.creator_id

    # Verify creator exists
    creator = (await db.execute(
        select(Creator).where(Creator.id == creator_id)
    )).scalar_one_or_none()
    if creator is None:
        logger.error("User %s has creator_id %s but creator row missing", current_user.id, creator_id)
        raise HTTPException(
            status_code=404,
            detail="Linked creator profile not found",
        )

    # ── Technique pages with key moment counts ───────────────────────────

    technique_pages = (await db.execute(
        select(TechniquePage)
        .where(TechniquePage.creator_id == creator_id)
        .options(
            selectinload(TechniquePage.key_moments).selectinload(KeyMoment.source_video),
            selectinload(TechniquePage.outgoing_links).selectinload(RelatedTechniqueLink.target_page),
            selectinload(TechniquePage.incoming_links).selectinload(RelatedTechniqueLink.source_page),
        )
        .order_by(TechniquePage.created_at.desc())
    )).scalars().all()

    techniques = []
    all_key_moments: list[TransparencyKeyMoment] = []
    all_relationships: list[TransparencyRelationship] = []
    all_tags: set[str] = set()

    for tp in technique_pages:
        techniques.append(TransparencyTechnique(
            title=tp.title,
            slug=tp.slug,
            topic_category=tp.topic_category,
            topic_tags=tp.topic_tags or [],
            summary=(tp.summary or "")[:200],
            created_at=tp.created_at,
            key_moment_count=len(tp.key_moments),
        ))

        # Collect tags
        if tp.topic_tags:
            all_tags.update(tp.topic_tags)

        # Key moments from this technique page
        for km in tp.key_moments:
            all_key_moments.append(TransparencyKeyMoment(
                title=km.title,
                summary=km.summary,
                content_type=km.content_type.value if hasattr(km.content_type, 'value') else str(km.content_type),
                start_time=km.start_time,
                end_time=km.end_time,
                source_video_filename=km.source_video.filename if km.source_video else "",
                technique_page_title=tp.title,
            ))

        # Outgoing relationships
        for link in tp.outgoing_links:
            all_relationships.append(TransparencyRelationship(
                relationship_type=link.relationship.value if hasattr(link.relationship, 'value') else str(link.relationship),
                source_page_title=tp.title,
                source_page_slug=tp.slug,
                target_page_title=link.target_page.title if link.target_page else "",
                target_page_slug=link.target_page.slug if link.target_page else "",
            ))

        # Incoming relationships
        for link in tp.incoming_links:
            all_relationships.append(TransparencyRelationship(
                relationship_type=link.relationship.value if hasattr(link.relationship, 'value') else str(link.relationship),
                source_page_title=link.source_page.title if link.source_page else "",
                source_page_slug=link.source_page.slug if link.source_page else "",
                target_page_title=tp.title,
                target_page_slug=tp.slug,
            ))

    # ── Key moments not linked to a technique page ───────────────────────
    # (moments from creator's videos that haven't been assigned to a page)

    unlinked_moments = (await db.execute(
        select(KeyMoment)
        .join(SourceVideo, KeyMoment.source_video_id == SourceVideo.id)
        .where(
            SourceVideo.creator_id == creator_id,
            KeyMoment.technique_page_id.is_(None),
        )
        .options(selectinload(KeyMoment.source_video))
    )).scalars().all()

    for km in unlinked_moments:
        all_key_moments.append(TransparencyKeyMoment(
            title=km.title,
            summary=km.summary,
            content_type=km.content_type.value if hasattr(km.content_type, 'value') else str(km.content_type),
            start_time=km.start_time,
            end_time=km.end_time,
            source_video_filename=km.source_video.filename if km.source_video else "",
            technique_page_title=None,
        ))

    # ── Source videos ────────────────────────────────────────────────────

    video_rows = (await db.execute(
        select(SourceVideo)
        .where(SourceVideo.creator_id == creator_id)
        .order_by(SourceVideo.created_at.desc())
    )).scalars().all()

    source_videos = [
        TransparencySourceVideo(
            filename=v.filename,
            processing_status=v.processing_status.value if hasattr(v.processing_status, 'value') else str(v.processing_status),
            created_at=v.created_at,
        )
        for v in video_rows
    ]

    logger.info(
        "Transparency loaded for creator %s: %d techniques, %d moments, %d relationships, %d videos, %d tags",
        creator_id, len(techniques), len(all_key_moments),
        len(all_relationships), len(source_videos), len(all_tags),
    )

    return CreatorTransparencyResponse(
        techniques=techniques,
        key_moments=all_key_moments,
        relationships=all_relationships,
        source_videos=source_videos,
        tags=sorted(all_tags),
    )