from datetime import datetime, timezone
from fastapi import APIRouter, Request, Depends, Form
from fastapi.responses import HTMLResponse, RedirectResponse
from fastapi.templating import Jinja2Templates
from sqlalchemy import select, desc

from app.models.base import async_session
from app.models.user import User
from app.models.workout import Phase, Workout, WorkoutSet
from app.auth import get_current_user

router = APIRouter()
templates = Jinja2Templates(directory="app/templates")


@router.get("/workouts", response_class=HTMLResponse)
async def workout_list(request: Request, user: User = Depends(get_current_user)):
    async with async_session() as session:
        result = await session.execute(
            select(Workout)
            .where(Workout.user_id == user.id)
            .order_by(desc(Workout.date))
        )
        workouts = result.scalars().all()
    return templates.TemplateResponse(request, "workouts.html", {
        "user": user,
        "workouts": workouts,
    })


@router.get("/workouts/new", response_class=HTMLResponse)
async def new_workout_page(request: Request, user: User = Depends(get_current_user)):
    async with async_session() as session:
        result = await session.execute(select(Phase))
        phases = result.scalars().all()
    return templates.TemplateResponse(request, "workout_new.html", {
        "user": user,
        "phases": phases,
    })


@router.post("/workouts/new")
async def new_workout(
    request: Request,
    user: User = Depends(get_current_user),
    name: str = Form(),
    date: str = Form(),
    phase_id: int = Form(default=None),
    notes: str = Form(default=""),
):
    async with async_session() as session:
        workout = Workout(
            user_id=user.id,
            phase_id=phase_id,
            name=name,
            date=date,
            notes=notes,
            status="plan",
        )
        session.add(workout)
        await session.commit()
        await session.refresh(workout)
        workout_id = workout.id

    return RedirectResponse(url=f"/workouts/{workout_id}", status_code=303)


@router.get("/workouts/{workout_id}", response_class=HTMLResponse)
async def workout_detail(
    request: Request,
    workout_id: int,
    user: User = Depends(get_current_user),
):
    async with async_session() as session:
        result = await session.execute(
            select(Workout).where(
                Workout.id == workout_id,
                Workout.user_id == user.id,
            )
        )
        workout = result.scalar_one_or_none()
        if not workout:
            return templates.TemplateResponse(request, "404.html", status_code=404)

        result = await session.execute(
            select(WorkoutSet)
            .where(WorkoutSet.workout_id == workout_id)
            .order_by(WorkoutSet.exercise, WorkoutSet.set_number)
        )
        sets = result.scalars().all()

        phase = None
        if workout.phase_id:
            result = await session.execute(select(Phase).where(Phase.id == workout.phase_id))
            phase = result.scalar_one_or_none()

    return templates.TemplateResponse(request, "workout_detail.html", {
        "user": user,
        "workout": workout,
        "sets": sets,
        "phase": phase,
    })


@router.post("/workouts/{workout_id}/add-set")
async def add_set(
    request: Request,
    workout_id: int,
    user: User = Depends(get_current_user),
    exercise: str = Form(),
    set_number: int = Form(),
    reps: int = Form(default=None),
    weight: float = Form(default=None),
    rpe: float = Form(default=None),
    notes: str = Form(default=""),
):
    async with async_session() as session:
        result = await session.execute(
            select(Workout).where(
                Workout.id == workout_id,
                Workout.user_id == user.id,
            )
        )
        workout = result.scalar_one_or_none()
        if not workout:
            return RedirectResponse(url="/workouts", status_code=303)

        ws = WorkoutSet(
            workout_id=workout_id,
            exercise=exercise,
            set_number=set_number,
            reps=reps,
            weight=weight,
            rpe=rpe,
            notes=notes,
        )
        session.add(ws)
        await session.commit()

    return RedirectResponse(url=f"/workouts/{workout_id}", status_code=303)


@router.post("/workouts/{workout_id}/complete")
async def complete_workout(
    request: Request,
    workout_id: int,
    user: User = Depends(get_current_user),
):
    async with async_session() as session:
        result = await session.execute(
            select(Workout).where(
                Workout.id == workout_id,
                Workout.user_id == user.id,
            )
        )
        workout = result.scalar_one_or_none()
        if workout:
            workout.status = "complete"
            await session.commit()

        if not workout:
            return RedirectResponse(url="/workouts", status_code=303)

        result = await session.execute(
            select(WorkoutSet)
            .where(WorkoutSet.workout_id == workout_id)
            .order_by(WorkoutSet.exercise, WorkoutSet.set_number)
        )
        sets = result.scalars().all()

        phase = None
        if workout.phase_id:
            result = await session.execute(select(Phase).where(Phase.id == workout.phase_id))
            phase = result.scalar_one_or_none()

    return templates.TemplateResponse(request, "workout_detail.html", {
        "user": user,
        "workout": workout,
        "sets": sets,
        "phase": phase,
    })