from typing import Annotated, Any

import httpx
from fastapi import Body, Depends, FastAPI, File, HTTPException, Query, UploadFile, status
from fastapi.middleware.cors import CORSMiddleware
from sqlalchemy import select
from sqlalchemy.exc import IntegrityError
from sqlalchemy.orm import Session

from app.core import settings
from app.db import create_schema, get_db
from app.models import Base, User
from app.s3 import upload_catalog_image
from app.schemas import MediaUploadRead, TokenRead, UserCreate, UserLogin, UserRead
from app.security import create_access_token, get_current_user, hash_password, verify_password

app = FastAPI(title="Train Watcher BFF", version="0.1.0")
app.add_middleware(
    CORSMiddleware,
    allow_origins=["http://localhost:5173", "http://127.0.0.1:5173"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

Db = Annotated[Session, Depends(get_db)]
CurrentUser = Annotated[User, Depends(get_current_user)]


@app.on_event("startup")
def on_startup() -> None:
    create_schema(Base.metadata)


@app.get("/health")
def health() -> dict[str, str]:
    return {"status": "ok"}


@app.post("/auth/register", response_model=TokenRead, status_code=status.HTTP_201_CREATED)
def register(payload: UserCreate, db: Db) -> TokenRead:
    user = User(
        email=payload.email.lower(),
        password_hash=hash_password(payload.password),
        display_name=payload.display_name,
    )
    db.add(user)
    try:
        db.commit()
    except IntegrityError as exc:
        db.rollback()
        raise HTTPException(
            status_code=status.HTTP_409_CONFLICT,
            detail="Email already registered",
        ) from exc
    db.refresh(user)
    return TokenRead(access_token=create_access_token(user), user=UserRead.model_validate(user))


@app.post("/auth/login", response_model=TokenRead)
def login(payload: UserLogin, db: Db) -> TokenRead:
    user = db.scalar(select(User).where(User.email == payload.email.lower()))
    if not user or not verify_password(payload.password, user.password_hash):
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Invalid email or password",
        )
    return TokenRead(access_token=create_access_token(user), user=UserRead.model_validate(user))


@app.post("/auth/logout")
def logout() -> dict[str, str]:
    return {"status": "ok"}


@app.get("/me", response_model=UserRead)
def me(user: CurrentUser) -> User:
    return user


def logic_headers(user: User) -> dict[str, str]:
    return {"X-Service-Token": settings.service_token, "X-User-Id": str(user.id)}


async def logic_request(
    method: str,
    path: str,
    user: User,
    *,
    json: dict[str, Any] | None = None,
    params: dict[str, Any] | None = None,
) -> Any:
    async with httpx.AsyncClient(base_url=settings.logic_base_url, timeout=10) as client:
        response = await client.request(
            method,
            path,
            headers=logic_headers(user),
            json=json,
            params=params,
        )
    if response.status_code >= 400:
        try:
            detail = response.json().get("detail", response.text)
        except ValueError:
            detail = response.text
        raise HTTPException(status_code=response.status_code, detail=detail)
    if not response.content:
        return None
    return response.json()


@app.post("/media/images", response_model=MediaUploadRead, status_code=status.HTTP_201_CREATED)
async def upload_image(
    user: CurrentUser,
    entity_type: Annotated[str, Query(pattern="^(equipment|exercise|machine)$")],
    file: Annotated[UploadFile, File()],
) -> dict[str, str]:
    if entity_type == "equipment":
        entity_type = "machine"
    return await upload_catalog_image(file, user.id, entity_type)


@app.get("/catalog/activity-sources")
async def list_activity_sources(
    user: CurrentUser,
    search: str | None = None,
    kind: Annotated[str | None, Query(pattern="^(exercise|machine|equipment)$")] = None,
    category: str | None = None,
    scope: Annotated[str, Query(pattern="^(all|builtin|mine)$")] = "all",
) -> Any:
    params = {
        key: value
        for key, value in {
            "search": search,
            "kind": kind,
            "category": category,
            "scope": scope,
        }.items()
        if value not in (None, "")
    }
    return await logic_request(
        "GET",
        "/internal/catalog/activity-sources",
        user,
        params=params,
    )


@app.post("/catalog/activity-sources", status_code=status.HTTP_201_CREATED)
async def create_activity_source(payload: dict[str, Any], user: CurrentUser) -> Any:
    return await logic_request("POST", "/internal/catalog/activity-sources", user, json=payload)


@app.get("/catalog/equipment")
async def list_equipment(user: CurrentUser, search: str | None = None) -> Any:
    return await logic_request(
        "GET", "/internal/catalog/equipment", user, params={"search": search}
    )


@app.post("/catalog/equipment", status_code=status.HTTP_201_CREATED)
async def create_equipment(payload: dict[str, Any], user: CurrentUser) -> Any:
    return await logic_request("POST", "/internal/catalog/equipment", user, json=payload)


@app.get("/catalog/exercises")
async def list_exercises(user: CurrentUser, search: str | None = None) -> Any:
    return await logic_request(
        "GET", "/internal/catalog/exercises", user, params={"search": search}
    )


@app.post("/catalog/exercises", status_code=status.HTTP_201_CREATED)
async def create_exercise(payload: dict[str, Any], user: CurrentUser) -> Any:
    return await logic_request("POST", "/internal/catalog/exercises", user, json=payload)


@app.get("/workouts")
async def list_workouts(user: CurrentUser) -> Any:
    return await logic_request("GET", "/internal/workouts", user)


@app.post("/workouts", status_code=status.HTTP_201_CREATED)
async def create_workout(payload: dict[str, Any], user: CurrentUser) -> Any:
    return await logic_request("POST", "/internal/workouts", user, json=payload)


@app.get("/workouts/active")
async def get_active_workout(user: CurrentUser) -> Any:
    return await logic_request("GET", "/internal/workouts/active", user)


@app.get("/workouts/{workout_id}")
async def get_workout(workout_id: str, user: CurrentUser) -> Any:
    return await logic_request("GET", f"/internal/workouts/{workout_id}", user)


@app.patch("/workouts/{workout_id}")
async def update_workout(workout_id: str, payload: dict[str, Any], user: CurrentUser) -> Any:
    return await logic_request("PATCH", f"/internal/workouts/{workout_id}", user, json=payload)


@app.post("/workouts/{workout_id}/finish")
async def finish_workout(
    workout_id: str,
    user: CurrentUser,
    payload: Annotated[dict[str, Any] | None, Body()] = None,
) -> Any:
    return await logic_request(
        "POST", f"/internal/workouts/{workout_id}/finish", user, json=payload
    )


@app.post("/workouts/{workout_id}/discard")
async def discard_workout(workout_id: str, user: CurrentUser) -> Any:
    return await logic_request("POST", f"/internal/workouts/{workout_id}/discard", user)


@app.post("/workouts/{workout_id}/items", status_code=status.HTTP_201_CREATED)
async def add_workout_item(workout_id: str, payload: dict[str, Any], user: CurrentUser) -> Any:
    return await logic_request("POST", f"/internal/workouts/{workout_id}/items", user, json=payload)


@app.post("/workout-items/{item_id}/sets", status_code=status.HTTP_201_CREATED)
async def add_workout_set(item_id: str, payload: dict[str, Any], user: CurrentUser) -> Any:
    return await logic_request(
        "POST", f"/internal/workout-items/{item_id}/sets", user, json=payload
    )


@app.post("/workout-items/{item_id}/sets/batch", status_code=status.HTTP_201_CREATED)
async def add_workout_sets_batch(item_id: str, payload: dict[str, Any], user: CurrentUser) -> Any:
    return await logic_request(
        "POST", f"/internal/workout-items/{item_id}/sets/batch", user, json=payload
    )


@app.patch("/workout-sets/{set_id}")
async def update_workout_set(set_id: str, payload: dict[str, Any], user: CurrentUser) -> Any:
    return await logic_request("PATCH", f"/internal/workout-sets/{set_id}", user, json=payload)


@app.delete("/workout-items/{item_id}", status_code=status.HTTP_204_NO_CONTENT)
async def remove_workout_item(item_id: str, user: CurrentUser) -> None:
    await logic_request("DELETE", f"/internal/workout-items/{item_id}", user)


@app.delete("/workout-items/{item_id}/sets/{set_id}", status_code=status.HTTP_204_NO_CONTENT)
async def remove_workout_set(item_id: str, set_id: str, user: CurrentUser) -> None:
    await logic_request("DELETE", f"/internal/workout-items/{item_id}/sets/{set_id}", user)


@app.get("/analytics/progression")
async def progression(
    user: CurrentUser,
    kind: Annotated[str, Query(pattern="^(exercise|machine|equipment)$")] = "exercise",
    entity_id: str | None = None,
) -> Any:
    p: dict[str, Any] = {"kind": kind}
    if entity_id is not None:
        p["entity_id"] = entity_id
    return await logic_request(
        "GET",
        "/internal/analytics/progression",
        user,
        params=p,
    )


@app.get("/analytics/calories")
async def calories(user: CurrentUser) -> Any:
    return await logic_request("GET", "/internal/analytics/calories", user)