from fastapi import APIRouter, Depends, HTTPException, UploadFile, File, Form, Request
from fastapi.responses import StreamingResponse
from sqlalchemy.orm import Session
from sqlalchemy import or_
from typing import List, Optional
import re

from .database import get_db
from .storage import get_storage, S3Storage
from .models import Grove, Tree, Fruit, Graft, Harvest, Consumer
from .schemas import (
    GroveCreate, GroveResponse,
    TreeCreate, TreeResponse,
    FruitResponse,
    GraftCreate, GraftResponse,
    CultivateResponse,
    ConsumerResponse,
    HealthResponse,
)

router = APIRouter()


def get_user_id(request: Request) -> str:
    """Extract user ID from request (simplified for now)"""
    api_key = request.headers.get("X-Orchard-API-Key")
    if api_key:
        return "api-user"
    auth = request.headers.get("Authorization")
    if auth:
        return "bearer-user"
    return "anonymous"


# Health check
@router.get("/health", response_model=HealthResponse)
def health_check():
    return HealthResponse(status="ok")


# Grove routes
@router.get("/api/v1/groves", response_model=List[GroveResponse])
def list_groves(request: Request, db: Session = Depends(get_db)):
    user_id = get_user_id(request)
    groves = db.query(Grove).filter(
        or_(Grove.is_public == True, Grove.created_by == user_id)
    ).order_by(Grove.name).all()
    return groves


@router.post("/api/v1/groves", response_model=GroveResponse)
def create_grove(grove: GroveCreate, request: Request, db: Session = Depends(get_db)):
    user_id = get_user_id(request)

    existing = db.query(Grove).filter(Grove.name == grove.name).first()
    if existing:
        raise HTTPException(status_code=400, detail="Grove already exists")

    db_grove = Grove(
        name=grove.name,
        description=grove.description,
        is_public=grove.is_public,
        created_by=user_id,
    )
    db.add(db_grove)
    db.commit()
    db.refresh(db_grove)
    return db_grove


@router.get("/api/v1/groves/{grove_name}", response_model=GroveResponse)
def get_grove(grove_name: str, db: Session = Depends(get_db)):
    grove = db.query(Grove).filter(Grove.name == grove_name).first()
    if not grove:
        raise HTTPException(status_code=404, detail="Grove not found")
    return grove


# Tree routes
@router.get("/api/v1/grove/{grove_name}/trees", response_model=List[TreeResponse])
def list_trees(grove_name: str, db: Session = Depends(get_db)):
    grove = db.query(Grove).filter(Grove.name == grove_name).first()
    if not grove:
        raise HTTPException(status_code=404, detail="Grove not found")

    trees = db.query(Tree).filter(Tree.grove_id == grove.id).order_by(Tree.name).all()
    return trees


@router.post("/api/v1/grove/{grove_name}/trees", response_model=TreeResponse)
def create_tree(grove_name: str, tree: TreeCreate, db: Session = Depends(get_db)):
    grove = db.query(Grove).filter(Grove.name == grove_name).first()
    if not grove:
        raise HTTPException(status_code=404, detail="Grove not found")

    existing = db.query(Tree).filter(Tree.grove_id == grove.id, Tree.name == tree.name).first()
    if existing:
        raise HTTPException(status_code=400, detail="Tree already exists in this grove")

    db_tree = Tree(
        grove_id=grove.id,
        name=tree.name,
        description=tree.description,
    )
    db.add(db_tree)
    db.commit()
    db.refresh(db_tree)
    return db_tree


# Cultivate (upload)
@router.post("/api/v1/grove/{grove_name}/{tree_name}/cultivate", response_model=CultivateResponse)
def cultivate(
    grove_name: str,
    tree_name: str,
    request: Request,
    file: UploadFile = File(...),
    tag: Optional[str] = Form(None),
    db: Session = Depends(get_db),
    storage: S3Storage = Depends(get_storage),
):
    user_id = get_user_id(request)

    # Get grove and tree
    grove = db.query(Grove).filter(Grove.name == grove_name).first()
    if not grove:
        raise HTTPException(status_code=404, detail="Grove not found")

    tree = db.query(Tree).filter(Tree.grove_id == grove.id, Tree.name == tree_name).first()
    if not tree:
        raise HTTPException(status_code=404, detail="Tree not found")

    # Store file
    sha256_hash, size, s3_key = storage.store(file.file)

    # Create or update fruit record
    fruit = db.query(Fruit).filter(Fruit.id == sha256_hash).first()
    if fruit:
        fruit.ref_count += 1
    else:
        fruit = Fruit(
            id=sha256_hash,
            size=size,
            content_type=file.content_type,
            original_name=file.filename,
            created_by=user_id,
            s3_key=s3_key,
        )
        db.add(fruit)

    # Record harvest
    harvest = Harvest(
        fruit_id=sha256_hash,
        tree_id=tree.id,
        original_name=file.filename,
        harvested_by=user_id,
        source_ip=request.client.host if request.client else None,
    )
    db.add(harvest)

    # Create tag if provided
    if tag:
        existing_graft = db.query(Graft).filter(Graft.tree_id == tree.id, Graft.name == tag).first()
        if existing_graft:
            existing_graft.fruit_id = sha256_hash
            existing_graft.created_by = user_id
        else:
            graft = Graft(
                tree_id=tree.id,
                name=tag,
                fruit_id=sha256_hash,
                created_by=user_id,
            )
            db.add(graft)

    db.commit()

    return CultivateResponse(
        fruit_id=sha256_hash,
        size=size,
        grove=grove_name,
        tree=tree_name,
        tag=tag,
    )


# Harvest (download)
@router.get("/api/v1/grove/{grove_name}/{tree_name}/+/{ref}")
def harvest(
    grove_name: str,
    tree_name: str,
    ref: str,
    db: Session = Depends(get_db),
    storage: S3Storage = Depends(get_storage),
):
    # Get grove and tree
    grove = db.query(Grove).filter(Grove.name == grove_name).first()
    if not grove:
        raise HTTPException(status_code=404, detail="Grove not found")

    tree = db.query(Tree).filter(Tree.grove_id == grove.id, Tree.name == tree_name).first()
    if not tree:
        raise HTTPException(status_code=404, detail="Tree not found")

    # Resolve reference to fruit
    fruit = None

    # Check for explicit prefixes
    if ref.startswith("fruit:"):
        fruit_id = ref[6:]
        fruit = db.query(Fruit).filter(Fruit.id == fruit_id).first()
    elif ref.startswith("tag:") or ref.startswith("version:"):
        tag_name = ref.split(":", 1)[1]
        graft = db.query(Graft).filter(Graft.tree_id == tree.id, Graft.name == tag_name).first()
        if graft:
            fruit = db.query(Fruit).filter(Fruit.id == graft.fruit_id).first()
    else:
        # Try as tag name first
        graft = db.query(Graft).filter(Graft.tree_id == tree.id, Graft.name == ref).first()
        if graft:
            fruit = db.query(Fruit).filter(Fruit.id == graft.fruit_id).first()
        else:
            # Try as direct fruit ID
            fruit = db.query(Fruit).filter(Fruit.id == ref).first()

    if not fruit:
        raise HTTPException(status_code=404, detail="Artifact not found")

    # Stream from S3
    stream = storage.get_stream(fruit.s3_key)

    filename = fruit.original_name or f"{fruit.id}"

    return StreamingResponse(
        stream,
        media_type=fruit.content_type or "application/octet-stream",
        headers={"Content-Disposition": f'attachment; filename="{filename}"'},
    )


# Compatibility route
@router.get("/grove/{grove_name}/{tree_name}/+/{ref}")
def harvest_compat(
    grove_name: str,
    tree_name: str,
    ref: str,
    db: Session = Depends(get_db),
    storage: S3Storage = Depends(get_storage),
):
    return harvest(grove_name, tree_name, ref, db, storage)


# Graft routes
@router.get("/api/v1/grove/{grove_name}/{tree_name}/grafts", response_model=List[GraftResponse])
def list_grafts(grove_name: str, tree_name: str, db: Session = Depends(get_db)):
    grove = db.query(Grove).filter(Grove.name == grove_name).first()
    if not grove:
        raise HTTPException(status_code=404, detail="Grove not found")

    tree = db.query(Tree).filter(Tree.grove_id == grove.id, Tree.name == tree_name).first()
    if not tree:
        raise HTTPException(status_code=404, detail="Tree not found")

    grafts = db.query(Graft).filter(Graft.tree_id == tree.id).order_by(Graft.name).all()
    return grafts


@router.post("/api/v1/grove/{grove_name}/{tree_name}/graft", response_model=GraftResponse)
def create_graft(
    grove_name: str,
    tree_name: str,
    graft: GraftCreate,
    request: Request,
    db: Session = Depends(get_db),
):
    user_id = get_user_id(request)

    grove = db.query(Grove).filter(Grove.name == grove_name).first()
    if not grove:
        raise HTTPException(status_code=404, detail="Grove not found")

    tree = db.query(Tree).filter(Tree.grove_id == grove.id, Tree.name == tree_name).first()
    if not tree:
        raise HTTPException(status_code=404, detail="Tree not found")

    # Verify fruit exists
    fruit = db.query(Fruit).filter(Fruit.id == graft.fruit_id).first()
    if not fruit:
        raise HTTPException(status_code=404, detail="Fruit not found")

    # Create or update graft
    existing = db.query(Graft).filter(Graft.tree_id == tree.id, Graft.name == graft.name).first()
    if existing:
        existing.fruit_id = graft.fruit_id
        existing.created_by = user_id
        db.commit()
        db.refresh(existing)
        return existing

    db_graft = Graft(
        tree_id=tree.id,
        name=graft.name,
        fruit_id=graft.fruit_id,
        created_by=user_id,
    )
    db.add(db_graft)
    db.commit()
    db.refresh(db_graft)
    return db_graft


# Consumer routes
@router.get("/api/v1/grove/{grove_name}/{tree_name}/consumers", response_model=List[ConsumerResponse])
def get_consumers(grove_name: str, tree_name: str, db: Session = Depends(get_db)):
    grove = db.query(Grove).filter(Grove.name == grove_name).first()
    if not grove:
        raise HTTPException(status_code=404, detail="Grove not found")

    tree = db.query(Tree).filter(Tree.grove_id == grove.id, Tree.name == tree_name).first()
    if not tree:
        raise HTTPException(status_code=404, detail="Tree not found")

    consumers = db.query(Consumer).filter(Consumer.tree_id == tree.id).order_by(Consumer.last_access.desc()).all()
    return consumers


# Fruit by ID
@router.get("/api/v1/fruit/{fruit_id}", response_model=FruitResponse)
def get_fruit(fruit_id: str, db: Session = Depends(get_db)):
    fruit = db.query(Fruit).filter(Fruit.id == fruit_id).first()
    if not fruit:
        raise HTTPException(status_code=404, detail="Fruit not found")
    return fruit