from __future__ import annotations

from datetime import date, timedelta

from fastapi import APIRouter, Depends, HTTPException
from sqlalchemy.orm import Session

from app.database import get_db
from app.models import User, Workout
from app.routers.auth import require_auth
from app.schemas import (
    AdjustSetRequest,
    CompleteSetRequest,
    MoveWorkoutRequest,
    PromptChoiceRequest,
    SetWeightRequest,
    WorkoutDetail,
)
from app.services.auth import get_or_create_profile
from app.services.reschedule import plan_move
from app.services.workout import (
    adjust_completed_set,
    complete_set,
    load_workout,
    pause_workout,
    resolve_prompt,
    resume_workout,
    set_exercise_weight,
    start_workout,
    workout_detail,
)

router = APIRouter(prefix="/api/workouts", tags=["workout-actions"])


@router.post("/{workout_id}/start", response_model=WorkoutDetail)
def api_start(workout_id: int, _: User = Depends(require_auth), db: Session = Depends(get_db)) -> WorkoutDetail:
    w = start_workout(db, load_workout(db, workout_id))
    return workout_detail(db, w)


@router.post("/{workout_id}/pause", response_model=WorkoutDetail)
def api_pause(workout_id: int, _: User = Depends(require_auth), db: Session = Depends(get_db)) -> WorkoutDetail:
    w = pause_workout(db, load_workout(db, workout_id))
    return workout_detail(db, w)


@router.post("/{workout_id}/resume", response_model=WorkoutDetail)
def api_resume(workout_id: int, _: User = Depends(require_auth), db: Session = Depends(get_db)) -> WorkoutDetail:
    w = resume_workout(db, load_workout(db, workout_id))
    return workout_detail(db, w)


@router.post("/{workout_id}/complete-set", response_model=WorkoutDetail)
def api_complete_set(
    workout_id: int,
    body: CompleteSetRequest,
    _: User = Depends(require_auth),
    db: Session = Depends(get_db),
) -> WorkoutDetail:
    w = complete_set(
        db,
        load_workout(db, workout_id),
        actual_reps=body.actual_reps,
        actual_weight_kg=body.actual_weight_kg,
    )
    return workout_detail(db, w)


@router.post("/{workout_id}/exercises/{exercise_id}/weight", response_model=WorkoutDetail)
def api_set_weight(
    workout_id: int,
    exercise_id: int,
    body: SetWeightRequest,
    _: User = Depends(require_auth),
    db: Session = Depends(get_db),
) -> WorkoutDetail:
    workout = load_workout(db, workout_id)
    exercise = next((e for e in workout.exercises if e.id == exercise_id), None)
    if not exercise:
        raise HTTPException(404, "Упражнение не найдено")
    w = set_exercise_weight(db, workout, exercise, body.weight_kg)
    return workout_detail(db, w)


@router.post("/{workout_id}/exercises/{exercise_id}/sets/{set_id}", response_model=WorkoutDetail)
def api_adjust_set(
    workout_id: int,
    exercise_id: int,
    set_id: int,
    body: AdjustSetRequest,
    _: User = Depends(require_auth),
    db: Session = Depends(get_db),
) -> WorkoutDetail:
    workout = load_workout(db, workout_id)
    exercise = next((e for e in workout.exercises if e.id == exercise_id), None)
    if not exercise:
        raise HTTPException(404, "Упражнение не найдено")
    workout_set = next((s for s in exercise.sets if s.id == set_id), None)
    if not workout_set:
        raise HTTPException(404, "Подход не найден")
    w = adjust_completed_set(
        db,
        workout,
        exercise,
        workout_set,
        actual_weight_kg=body.actual_weight_kg,
        actual_reps=body.actual_reps,
    )
    return workout_detail(db, w)


@router.post("/{workout_id}/move", response_model=WorkoutDetail)
def api_move(
    workout_id: int,
    body: MoveWorkoutRequest,
    _: User = Depends(require_auth),
    db: Session = Depends(get_db),
) -> WorkoutDetail:
    workout = load_workout(db, workout_id)
    profile = get_or_create_profile(db)
    weekdays = profile.training_weekdays or []
    if len(weekdays) != 3:
        raise HTTPException(400, "Не заданы дни тренировок")
    rows = db.query(Workout).filter(Workout.cycle_number == workout.cycle_number).all()
    assigned = plan_move(rows, workout_id, body.scheduled_date, list(weekdays))
    for row in rows:
        if row.id in assigned:
            row.scheduled_date = date(2099, 1, 1) + timedelta(days=row.id % 300)
    db.flush()
    by_id = {row.id: row for row in rows}
    for workout_row_id, scheduled in assigned.items():
        by_id[workout_row_id].scheduled_date = scheduled
    db.commit()
    return workout_detail(db, load_workout(db, workout_id))


@router.post("/{workout_id}/exercises/{exercise_id}/prompt", response_model=WorkoutDetail)
def api_prompt(
    workout_id: int,
    exercise_id: int,
    body: PromptChoiceRequest,
    _: User = Depends(require_auth),
    db: Session = Depends(get_db),
) -> WorkoutDetail:
    workout = load_workout(db, workout_id)
    exercise = next((e for e in workout.exercises if e.id == exercise_id), None)
    if not exercise:
        raise HTTPException(404, "Упражнение не найдено")
    w = resolve_prompt(
        db,
        workout,
        exercise,
        choice=body.choice,
        weight_kg=body.weight_kg,
        increase_kg=body.increase_kg,
        decrease_kg=body.decrease_kg,
    )
    return workout_detail(db, w)