from datetime import datetime
from uuid import uuid4
from src.db.chapter_activities import ChapterActivity
from fastapi import HTTPException, Request, status
from sqlmodel import Session, select
from src.db.activities import Activity
from src.db.courses import Course
from src.db.trail_runs import TrailRun, TrailRunRead
from src.db.trail_steps import TrailStep
from src.db.trails import Trail, TrailCreate, TrailRead
from src.db.users import AnonymousUser, PublicUser


async def create_user_trail(
    request: Request,
    user: PublicUser,
    trail_object: TrailCreate,
    db_session: Session,
) -> Trail:
    statement = select(Trail).where(Trail.org_id == trail_object.org_id)
    trail = db_session.exec(statement).first()

    if trail:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="Trail already exists",
        )

    trail = Trail.from_orm(trail_object)

    trail.creation_date = str(datetime.now())
    trail.update_date = str(datetime.now())
    trail.org_id = trail_object.org_id
    trail.trail_uuid = str(f"trail_{uuid4()}")

    # create trail
    db_session.add(trail)
    db_session.commit()
    db_session.refresh(trail)

    return trail


async def get_user_trails(
    request: Request,
    user: PublicUser,
    db_session: Session,
) -> TrailRead:
    statement = select(Trail).where(Trail.user_id == user.id)
    trail = db_session.exec(statement).first()

    if not trail:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND, detail="Trail not found"
        )

    statement = select(TrailRun).where(TrailRun.trail_id == trail.id)
    trail_runs = db_session.exec(statement).all()

    trail_runs = [
        TrailRunRead(**trail_run.__dict__, course={}, steps=[], course_total_steps=0)
        for trail_run in trail_runs
    ]

    # Add course object and total activities in a course to trail runs
    for trail_run in trail_runs:
        statement = select(Course).where(Course.id == trail_run.course_id)
        course = db_session.exec(statement).first()
        trail_run.course = course

        # Add number of activities (steps) in a course
        statement = select(ChapterActivity).where(
            ChapterActivity.course_id == trail_run.course_id
        )
        course_total_steps = db_session.exec(statement)
        # count number of activities in a this list
        trail_run.course_total_steps = len(course_total_steps.all())

    for trail_run in trail_runs:
        statement = select(TrailStep).where(TrailStep.trailrun_id == trail_run.id)
        trail_steps = db_session.exec(statement).all()

        trail_steps = [TrailStep(**trail_step.__dict__) for trail_step in trail_steps]
        trail_run.steps = trail_steps

        for trail_step in trail_steps:
            statement = select(Course).where(Course.id == trail_step.course_id)
            course = db_session.exec(statement).first()
            trail_step.data = dict(course=course)

    trail_read = TrailRead(
        **trail.dict(),
        runs=trail_runs,
    )

    return trail_read


async def get_user_trail_with_orgid(
    request: Request, user: PublicUser | AnonymousUser, org_id: int, db_session: Session
) -> TrailRead:
    statement = select(Trail).where(Trail.org_id == org_id, Trail.user_id == user.id)
    trail = db_session.exec(statement).first()

    if not trail:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND, detail="Trail not found"
        )

    statement = select(TrailRun).where(TrailRun.trail_id == trail.id)
    trail_runs = db_session.exec(statement).all()

    trail_runs = [
        TrailRunRead(**trail_run.__dict__, course={}, steps=[], course_total_steps=0)
        for trail_run in trail_runs
    ]

    # Add course object and total activities in a course to trail runs
    for trail_run in trail_runs:
        statement = select(Course).where(Course.id == trail_run.course_id)
        course = db_session.exec(statement).first()
        trail_run.course = course

        # Add number of activities (steps) in a course
        statement = select(ChapterActivity).where(
            ChapterActivity.course_id == trail_run.course_id
        )
        course_total_steps = db_session.exec(statement)
        # count number of activities in a this list
        trail_run.course_total_steps = len(course_total_steps.all())

    for trail_run in trail_runs:
        statement = select(TrailStep).where(TrailStep.trailrun_id == trail_run.id)
        trail_steps = db_session.exec(statement).all()

        trail_steps = [TrailStep(**trail_step.__dict__) for trail_step in trail_steps]
        trail_run.steps = trail_steps

        for trail_step in trail_steps:
            statement = select(Course).where(Course.id == trail_step.course_id)
            course = db_session.exec(statement).first()
            trail_step.data = dict(course=course)

    trail_read = TrailRead(
        **trail.dict(),
        runs=trail_runs,
    )

    return trail_read


async def add_activity_to_trail(
    request: Request,
    user: PublicUser,
    activity_uuid: str,
    db_session: Session,
) -> TrailRead:
    # Look for the activity
    statement = select(Activity).where(Activity.activity_uuid == activity_uuid)
    activity = db_session.exec(statement).first()

    if not activity:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND, detail="Activity not found"
        )

    statement = select(Course).where(Course.id == activity.course_id)
    course = db_session.exec(statement).first()

    if not course:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND, detail="Course not found"
        )

    statement = select(Trail).where(
        Trail.org_id == course.org_id, Trail.user_id == user.id
    )
    trail = db_session.exec(statement).first()

    if not trail:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND, detail="Trail not found"
        )

    statement = select(TrailRun).where(
        TrailRun.trail_id == trail.id, TrailRun.course_id == course.id
    )
    trailrun = db_session.exec(statement).first()

    if not trailrun:
        trailrun = TrailRun(
            trail_id=trail.id if trail.id is not None else 0,
            course_id=course.id if course.id is not None else 0,
            org_id=course.org_id,
            user_id=user.id,
            creation_date=str(datetime.now()),
            update_date=str(datetime.now()),
        )
        db_session.add(trailrun)
        db_session.commit()
        db_session.refresh(trailrun)

    statement = select(TrailStep).where(
        TrailStep.trailrun_id == trailrun.id, TrailStep.activity_id == activity.id
    )
    trailstep = db_session.exec(statement).first()

    if not trailstep:
        trailstep = TrailStep(
            trailrun_id=trailrun.id if trailrun.id is not None else 0,
            activity_id=activity.id,
            course_id=course.id if course.id is not None else 0,
            trail_id=trail.id if trail.id is not None else 0,
            org_id=course.org_id,
            complete=False,
            teacher_verified=False,
            grade="",
            user_id=user.id,
            creation_date=str(datetime.now()),
            update_date=str(datetime.now()),
        )
        db_session.add(trailstep)
        db_session.commit()
        db_session.refresh(trailstep)

    statement = select(TrailRun).where(TrailRun.trail_id == trail.id)
    trail_runs = db_session.exec(statement).all()

    trail_runs = [
        TrailRunRead(**trail_run.__dict__, course={}, steps=[], course_total_steps=0)
        for trail_run in trail_runs
    ]

    for trail_run in trail_runs:
        statement = select(TrailStep).where(TrailStep.trailrun_id == trail_run.id)
        trail_steps = db_session.exec(statement).all()

        trail_steps = [TrailStep(**trail_step.__dict__) for trail_step in trail_steps]
        trail_run.steps = trail_steps

        for trail_step in trail_steps:
            statement = select(Course).where(Course.id == trail_step.course_id)
            course = db_session.exec(statement).first()
            trail_step.data = dict(course=course)

    trail_read = TrailRead(
        **trail.dict(),
        runs=trail_runs,
    )

    return trail_read


async def add_course_to_trail(
    request: Request,
    user: PublicUser,
    course_uuid: str,
    db_session: Session,
) -> TrailRead:
    statement = select(Course).where(Course.course_uuid == course_uuid)
    course = db_session.exec(statement).first()

    if not course:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND, detail="Course not found"
        )

    # check if run already exists
    statement = select(TrailRun).where(TrailRun.course_id == course.id)
    trailrun = db_session.exec(statement).first()

    if trailrun:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST, detail="TrailRun already exists"
        )

    statement = select(Trail).where(
        Trail.org_id == course.org_id, Trail.user_id == user.id
    )
    trail = db_session.exec(statement).first()

    if not trail:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND, detail="Trail not found"
        )

    statement = select(TrailRun).where(
        TrailRun.trail_id == trail.id, TrailRun.course_id == course.id
    )
    trail_run = db_session.exec(statement).first()

    if not trail_run:
        trail_run = TrailRun(
            trail_id=trail.id if trail.id is not None else 0,
            course_id=course.id if course.id is not None else 0,
            org_id=course.org_id,
            user_id=user.id,
            creation_date=str(datetime.now()),
            update_date=str(datetime.now()),
        )
        db_session.add(trail_run)
        db_session.commit()
        db_session.refresh(trail_run)

    statement = select(TrailRun).where(TrailRun.trail_id == trail.id)
    trail_runs = db_session.exec(statement).all()

    trail_runs = [
        TrailRunRead(**trail_run.__dict__, course={}, steps=[], course_total_steps=0 ) for trail_run in trail_runs
    ]

    for trail_run in trail_runs:
        statement = select(TrailStep).where(TrailStep.trailrun_id == trail_run.id)
        trail_steps = db_session.exec(statement).all()

        trail_steps = [TrailStep(**trail_step.__dict__) for trail_step in trail_steps]
        trail_run.steps = trail_steps

        for trail_step in trail_steps:
            statement = select(Course).where(Course.id == trail_step.course_id)
            course = db_session.exec(statement).first()
            trail_step.data = dict(course=course)

    trail_read = TrailRead(
        **trail.dict(),
        runs=trail_runs,
    )

    return trail_read


async def remove_course_from_trail(
    request: Request,
    user: PublicUser,
    course_uuid: str,
    db_session: Session,
) -> TrailRead:
    statement = select(Course).where(Course.course_uuid == course_uuid)
    course = db_session.exec(statement).first()

    if not course:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND, detail="Course not found"
        )

    statement = select(Trail).where(
        Trail.org_id == course.org_id, Trail.user_id == user.id
    )
    trail = db_session.exec(statement).first()

    if not trail:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND, detail="Trail not found"
        )

    statement = select(TrailRun).where(
        TrailRun.trail_id == trail.id, TrailRun.course_id == course.id
    )
    trail_run = db_session.exec(statement).first()

    if trail_run:
        db_session.delete(trail_run)
        db_session.commit()

    # Delete all trail steps for this course
    statement = select(TrailStep).where(TrailStep.course_id == course.id)
    trail_steps = db_session.exec(statement).all()

    for trail_step in trail_steps:
        db_session.delete(trail_step)
        db_session.commit()

    statement = select(TrailRun).where(TrailRun.trail_id == trail.id)
    trail_runs = db_session.exec(statement).all()

    trail_runs = [
        TrailRunRead(**trail_run.__dict__, course={}, steps=[], course_total_steps=0    ) for trail_run in trail_runs
    ]

    for trail_run in trail_runs:
        statement = select(TrailStep).where(TrailStep.trailrun_id == trail_run.id)
        trail_steps = db_session.exec(statement).all()

        trail_steps = [TrailStep(**trail_step.__dict__) for trail_step in trail_steps]
        trail_run.steps = trail_steps

        for trail_step in trail_steps:
            statement = select(Course).where(Course.id == trail_step.course_id)
            course = db_session.exec(statement).first()
            trail_step.data = dict(course=course)

    trail_read = TrailRead(
        **trail.dict(),
        runs=trail_runs,
    )

    return trail_read