from fastapi import APIRouter, Depends, HTTPException, Query
from sqlalchemy.orm import Session
from sqlalchemy import desc
from typing import Optional
from datetime import datetime, timezone

from ..database import get_db
from ..models import ExternalProduct, PromotionCampaign, CampaignKeyword, SEOAudit, KeywordRanking, OptimizationTask, User
from .auth import get_current_user, org_filter

router = APIRouter(prefix="/api/external", tags=["external_promotion"])


def _org_filtered_query(db, model, current_user):
    query = db.query(model)
    of = org_filter(current_user, model)
    if of is not True:
        query = query.filter(of)
    return query


# ===== External Products =====

@router.get("/products")
def list_products(
    type: Optional[str] = None,
    limit: int = Query(50, ge=1, le=200),
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    query = _org_filtered_query(db, ExternalProduct, current_user)
    if type:
        query = query.filter(ExternalProduct.type == type)
    products = query.order_by(desc(ExternalProduct.created_at)).limit(limit).all()
    return {"ok": True, "data": [p.to_dict() for p in products]}


@router.get("/products/{product_id}")
def get_product(
    product_id: int,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    product = _org_filtered_query(db, ExternalProduct, current_user).filter(
        ExternalProduct.id == product_id
    ).first()
    if not product:
        raise HTTPException(status_code=404, detail="产品不存在")
    return {"ok": True, "data": product.to_dict()}


@router.post("/products")
def create_product(
    body: dict,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    product = ExternalProduct(
        name=body.get("name"),
        type=body.get("type", "website"),
        url=body.get("url"),
        domain=body.get("domain"),
        app_id=body.get("app_id"),
        account_id=body.get("account_id"),
        description=body.get("description"),
        org_id=current_user.org_id,
    )
    db.add(product)
    db.commit()
    db.refresh(product)
    return {"ok": True, "data": product.to_dict()}


@router.put("/products/{product_id}")
def update_product(
    product_id: int,
    body: dict,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    product = _org_filtered_query(db, ExternalProduct, current_user).filter(
        ExternalProduct.id == product_id
    ).first()
    if not product:
        raise HTTPException(status_code=404, detail="产品不存在")
    for field in ("name", "type", "url", "domain", "app_id", "account_id", "description"):
        if field in body:
            setattr(product, field, body[field])
    db.commit()
    db.refresh(product)
    return {"ok": True, "data": product.to_dict()}


@router.delete("/products/{product_id}")
def delete_product(
    product_id: int,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    product = _org_filtered_query(db, ExternalProduct, current_user).filter(
        ExternalProduct.id == product_id
    ).first()
    if not product:
        raise HTTPException(status_code=404, detail="产品不存在")
    db.delete(product)
    db.commit()
    return {"ok": True, "message": "已删除"}


# ===== Promotion Campaigns =====

@router.get("/campaigns")
def list_campaigns(
    product_id: Optional[int] = None,
    status: Optional[str] = None,
    limit: int = Query(50, ge=1, le=200),
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    query = _org_filtered_query(db, PromotionCampaign, current_user)
    if product_id:
        query = query.filter(PromotionCampaign.product_id == product_id)
    if status:
        query = query.filter(PromotionCampaign.status == status)
    campaigns = query.order_by(desc(PromotionCampaign.created_at)).limit(limit).all()
    result = []
    for c in campaigns:
        d = c.to_dict()
        product = db.query(ExternalProduct).filter(ExternalProduct.id == c.product_id).first()
        d["product_name"] = product.name if product else None
        result.append(d)
    return {"ok": True, "data": result}


@router.get("/campaigns/{campaign_id}")
def get_campaign(
    campaign_id: int,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    campaign = _org_filtered_query(db, PromotionCampaign, current_user).filter(
        PromotionCampaign.id == campaign_id
    ).first()
    if not campaign:
        raise HTTPException(status_code=404, detail="活动不存在")
    d = campaign.to_dict()
    product = db.query(ExternalProduct).filter(ExternalProduct.id == campaign.product_id).first()
    d["product_name"] = product.name if product else None
    return {"ok": True, "data": d}


@router.post("/campaigns")
def create_campaign(
    body: dict,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    product = db.query(ExternalProduct).filter(ExternalProduct.id == body.get("product_id")).first()
    if not product:
        raise HTTPException(status_code=404, detail="产品不存在")
    campaign = PromotionCampaign(
        name=body.get("name"),
        product_id=body.get("product_id"),
        status=body.get("status", "active"),
        keywords=body.get("keywords", []),
        target_engines=body.get("target_engines", []),
        notes=body.get("notes"),
        org_id=current_user.org_id,
    )
    db.add(campaign)
    db.commit()
    db.refresh(campaign)
    d = campaign.to_dict()
    d["product_name"] = product.name
    return {"ok": True, "data": d}


@router.put("/campaigns/{campaign_id}")
def update_campaign(
    campaign_id: int,
    body: dict,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    campaign = _org_filtered_query(db, PromotionCampaign, current_user).filter(
        PromotionCampaign.id == campaign_id
    ).first()
    if not campaign:
        raise HTTPException(status_code=404, detail="活动不存在")
    for field in ("name", "status", "keywords", "target_engines", "notes"):
        if field in body:
            setattr(campaign, field, body[field])
    db.commit()
    db.refresh(campaign)
    d = campaign.to_dict()
    product = db.query(ExternalProduct).filter(ExternalProduct.id == campaign.product_id).first()
    d["product_name"] = product.name if product else None
    return {"ok": True, "data": d}


@router.delete("/campaigns/{campaign_id}")
def delete_campaign(
    campaign_id: int,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    campaign = _org_filtered_query(db, PromotionCampaign, current_user).filter(
        PromotionCampaign.id == campaign_id
    ).first()
    if not campaign:
        raise HTTPException(status_code=404, detail="活动不存在")
    db.delete(campaign)
    db.commit()
    return {"ok": True, "message": "已删除"}


# ===== Campaign Keywords =====

@router.get("/keywords")
def list_keywords(
    campaign_id: Optional[int] = None,
    limit: int = Query(100, ge=1, le=500),
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    query = _org_filtered_query(db, CampaignKeyword, current_user)
    if campaign_id:
        query = query.filter(CampaignKeyword.campaign_id == campaign_id)
    keywords = query.order_by(desc(CampaignKeyword.created_at)).limit(limit).all()
    return {"ok": True, "data": [k.to_dict() for k in keywords]}


@router.post("/keywords")
def create_keyword(
    body: dict,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    campaign = db.query(PromotionCampaign).filter(PromotionCampaign.id == body.get("campaign_id")).first()
    if not campaign:
        raise HTTPException(status_code=404, detail="活动不存在")
    kw = CampaignKeyword(
        campaign_id=body.get("campaign_id"),
        keyword=body.get("keyword"),
        search_volume=body.get("search_volume"),
        difficulty=body.get("difficulty"),
        current_rank=body.get("current_rank"),
        target_rank=body.get("target_rank"),
        org_id=current_user.org_id,
    )
    db.add(kw)
    db.commit()
    db.refresh(kw)
    return {"ok": True, "data": kw.to_dict()}


@router.put("/keywords/{keyword_id}")
def update_keyword(
    keyword_id: int,
    body: dict,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    kw = _org_filtered_query(db, CampaignKeyword, current_user).filter(
        CampaignKeyword.id == keyword_id
    ).first()
    if not kw:
        raise HTTPException(status_code=404, detail="关键词不存在")
    for field in ("search_volume", "difficulty", "current_rank", "target_rank"):
        if field in body:
            setattr(kw, field, body[field])
    if body.get("update_last_checked"):
        kw.last_checked = datetime.now(timezone.utc)
    db.commit()
    db.refresh(kw)
    return {"ok": True, "data": kw.to_dict()}


@router.delete("/keywords/{keyword_id}")
def delete_keyword(
    keyword_id: int,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    kw = _org_filtered_query(db, CampaignKeyword, current_user).filter(
        CampaignKeyword.id == keyword_id
    ).first()
    if not kw:
        raise HTTPException(status_code=404, detail="关键词不存在")
    db.delete(kw)
    db.commit()
    return {"ok": True, "message": "已删除"}


# ===== SEO Audits =====

@router.get("/audits")
def list_audits(
    product_id: Optional[int] = None,
    limit: int = Query(50, ge=1, le=200),
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    query = _org_filtered_query(db, SEOAudit, current_user)
    if product_id:
        query = query.filter(SEOAudit.product_id == product_id)
    audits = query.order_by(desc(SEOAudit.checked_at)).limit(limit).all()
    result = []
    for a in audits:
        d = a.to_dict()
        product = db.query(ExternalProduct).filter(ExternalProduct.id == a.product_id).first()
        d["product_name"] = product.name if product else None
        result.append(d)
    return {"ok": True, "data": result}


@router.get("/audits/{audit_id}")
def get_audit(
    audit_id: int,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    audit = _org_filtered_query(db, SEOAudit, current_user).filter(
        SEOAudit.id == audit_id
    ).first()
    if not audit:
        raise HTTPException(status_code=404, detail="审计记录不存在")
    d = audit.to_dict()
    d["raw_data"] = audit.raw_data or {}
    tasks = db.query(OptimizationTask).filter(OptimizationTask.audit_id == audit_id).all()
    d["optimization_tasks"] = [t.to_dict() for t in tasks]
    return {"ok": True, "data": d}


# ===== Keyword Rankings =====

@router.get("/rankings")
def list_keyword_rankings(
    campaign_id: Optional[int] = None,
    keyword_id: Optional[int] = None,
    product_id: Optional[int] = None,
    search_engine: Optional[str] = None,
    limit: int = Query(100, ge=1, le=500),
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    query = _org_filtered_query(db, KeywordRanking, current_user)
    if campaign_id:
        query = query.filter(KeywordRanking.campaign_id == campaign_id)
    if keyword_id:
        query = query.filter(KeywordRanking.keyword_id == keyword_id)
    if product_id:
        query = query.filter(KeywordRanking.product_id == product_id)
    if search_engine:
        query = query.filter(KeywordRanking.search_engine == search_engine)
    rankings = query.order_by(desc(KeywordRanking.checked_at)).limit(limit).all()
    return {"ok": True, "data": [r.to_dict() for r in rankings]}


@router.get("/rankings/overview")
def rankings_overview(
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    base = _org_filtered_query(db, KeywordRanking, current_user)
    total = base.count()
    with_rank = base.filter(KeywordRanking.rank.isnot(None)).count()
    engine_breakdown = {}
    for row in base.with_entities(KeywordRanking.search_engine,
                                   KeywordRanking.rank).all():
        eng = row.search_engine
        if eng not in engine_breakdown:
            engine_breakdown[eng] = {"total": 0, "with_rank": 0}
        engine_breakdown[eng]["total"] += 1
        if row.rank is not None:
            engine_breakdown[eng]["with_rank"] += 1
    return {
        "ok": True,
        "data": {
            "total": total,
            "with_rank": with_rank,
            "engine_breakdown": engine_breakdown,
        }
    }


# ===== Optimization Tasks =====

@router.get("/optimization-tasks")
def list_optimization_tasks(
    product_id: Optional[int] = None,
    audit_id: Optional[int] = None,
    status: Optional[str] = None,
    severity: Optional[str] = None,
    limit: int = Query(100, ge=1, le=500),
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    query = _org_filtered_query(db, OptimizationTask, current_user)
    if product_id:
        query = query.filter(OptimizationTask.product_id == product_id)
    if audit_id:
        query = query.filter(OptimizationTask.audit_id == audit_id)
    if status:
        query = query.filter(OptimizationTask.status == status)
    if severity:
        query = query.filter(OptimizationTask.severity == severity)
    tasks = query.order_by(desc(OptimizationTask.created_at)).limit(limit).all()
    return {"ok": True, "data": [t.to_dict() for t in tasks]}


@router.patch("/optimization-tasks/{task_id}")
def update_optimization_task(
    task_id: int,
    body: dict,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    task = _org_filtered_query(db, OptimizationTask, current_user).filter(
        OptimizationTask.id == task_id
    ).first()
    if not task:
        raise HTTPException(status_code=404, detail="优化任务不存在")
    if "status" in body:
        task.status = body["status"]
    if "severity" in body:
        task.severity = body["severity"]
    if "recommendation" in body:
        task.recommendation = body["recommendation"]
    db.commit()
    db.refresh(task)
    return {"ok": True, "data": task.to_dict()}


@router.get("/overview")
def external_overview(
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    products = _org_filtered_query(db, ExternalProduct, current_user).count()
    campaigns = _org_filtered_query(db, PromotionCampaign, current_user).count()
    active_campaigns = _org_filtered_query(db, PromotionCampaign, current_user).filter(
        PromotionCampaign.status == "active"
    ).count()
    audits = _org_filtered_query(db, SEOAudit, current_user).count()
    keywords = _org_filtered_query(db, CampaignKeyword, current_user).count()
    open_tasks = _org_filtered_query(db, OptimizationTask, current_user).filter(
        OptimizationTask.status == "open"
    ).count()

    type_breakdown = {}
    for row in _org_filtered_query(db, ExternalProduct, current_user).with_entities(
        ExternalProduct.type
    ).all():
        t = row.type
        type_breakdown[t] = type_breakdown.get(t, 0) + 1

    return {
        "ok": True,
        "data": {
            "products": products,
            "campaigns": campaigns,
            "active_campaigns": active_campaigns,
            "audits": audits,
            "keywords": keywords,
            "open_tasks": open_tasks,
            "type_breakdown": type_breakdown,
        }
    }