from datetime import datetime
from typing import List, Literal
from uuid import uuid4
from pydantic import BaseModel
from src.security.auth import non_public_endpoint
from src.security.rbac.rbac import (
    authorization_verify_based_on_roles,
    authorization_verify_based_on_roles_and_authorship,
    authorization_verify_if_element_is_public,
    authorization_verify_if_user_is_anon,
)
from src.services.courses.courses import Course
from src.services.courses.activities.activities import ActivityInDB
from src.services.users.users import PublicUser
from fastapi import HTTPException, status, Request


class CourseChapter(BaseModel):
    name: str
    description: str
    activities: list


class CourseChapterInDB(CourseChapter):
    coursechapter_id: str
    course_id: str
    creationDate: str
    updateDate: str


# Frontend
class CourseChapterMetaData(BaseModel):
    chapterOrder: List[str]
    chapters: dict
    activities: object


#### Classes ####################################################

####################################################
# CRUD
####################################################


async def create_coursechapter(
    request: Request,
    coursechapter_object: CourseChapter,
    course_id: str,
    current_user: PublicUser,
):
    courses = request.app.db["courses"]
    users = request.app.db["users"]
    # get course org_id and verify rights
    await courses.find_one({"course_id": course_id})
    user = await users.find_one({"user_id": current_user.user_id})

    # generate coursechapter_id with uuid4
    coursechapter_id = str(f"coursechapter_{uuid4()}")

    hasRoleRights = await authorization_verify_based_on_roles(
        request, current_user.user_id, "create", user["roles"], course_id
    )

    if not hasRoleRights:
        raise HTTPException(
            status_code=status.HTTP_409_CONFLICT,
            detail="Roles : Insufficient rights to perform this action",
        )

    coursechapter = CourseChapterInDB(
        coursechapter_id=coursechapter_id,
        creationDate=str(datetime.now()),
        updateDate=str(datetime.now()),
        course_id=course_id,
        **coursechapter_object.dict(),
    )

    courses.update_one(
        {"course_id": course_id},
        {
            "$addToSet": {
                "chapters": coursechapter_id,
                "chapters_content": coursechapter.dict(),
            }
        },
    )

    return coursechapter.dict()


async def get_coursechapter(
    request: Request, coursechapter_id: str, current_user: PublicUser
):
    courses = request.app.db["courses"]

    coursechapter = await courses.find_one(
        {"chapters_content.coursechapter_id": coursechapter_id}
    )

    if coursechapter:
        # verify course rights
        await verify_rights(request, coursechapter["course_id"], current_user, "read")
        coursechapter = CourseChapter(**coursechapter)

        return coursechapter

    else:
        raise HTTPException(
            status_code=status.HTTP_409_CONFLICT, detail="CourseChapter does not exist"
        )


async def update_coursechapter(
    request: Request,
    coursechapter_object: CourseChapter,
    coursechapter_id: str,
    current_user: PublicUser,
):
    courses = request.app.db["courses"]

    coursechapter = await courses.find_one(
        {"chapters_content.coursechapter_id": coursechapter_id}
    )

    if coursechapter:
        # verify course rights
        await verify_rights(request, coursechapter["course_id"], current_user, "update")

        coursechapter = CourseChapterInDB(
            coursechapter_id=coursechapter_id,
            creationDate=str(datetime.now()),
            updateDate=str(datetime.now()),
            course_id=coursechapter["course_id"],
            **coursechapter_object.dict(),
        )

        courses.update_one(
            {"chapters_content.coursechapter_id": coursechapter_id},
            {"$set": {"chapters_content.$": coursechapter.dict()}},
        )

        return coursechapter

    else:
        raise HTTPException(
            status_code=status.HTTP_409_CONFLICT, detail="Coursechapter does not exist"
        )


async def delete_coursechapter(
    request: Request, coursechapter_id: str, current_user: PublicUser
):
    courses = request.app.db["courses"]

    course = await courses.find_one(
        {"chapters_content.coursechapter_id": coursechapter_id}
    )

    if course:
        # verify course rights
        await verify_rights(request, course["course_id"], current_user, "delete")

        # Remove coursechapter from course
        await courses.update_one(
            {"course_id": course["course_id"]},
            {"$pull": {"chapters": coursechapter_id}},
        )

        await courses.update_one(
            {"chapters_content.coursechapter_id": coursechapter_id},
            {"$pull": {"chapters_content": {"coursechapter_id": coursechapter_id}}},
        )

        return {"message": "Coursechapter deleted"}

    else:
        raise HTTPException(
            status_code=status.HTTP_409_CONFLICT, detail="Course does not exist"
        )


####################################################
# Misc
####################################################


async def get_coursechapters(
    request: Request, course_id: str, page: int = 1, limit: int = 10
):
    courses = request.app.db["courses"]

    course = await courses.find_one({"course_id": course_id})

    if course:
        course = Course(**course)
        coursechapters = course.chapters_content

        return coursechapters


async def get_coursechapters_meta(
    request: Request, course_id: str, current_user: PublicUser
):
    courses = request.app.db["courses"]
    activities = request.app.db["activities"]

    await non_public_endpoint(current_user)

    await verify_rights(request, course_id, current_user, "read")

    coursechapters = await courses.find_one(
        {"course_id": course_id}, {"chapters": 1, "chapters_content": 1, "_id": 0}
    )

    coursechapters = coursechapters

    if not coursechapters:
        raise HTTPException(
            status_code=status.HTTP_409_CONFLICT, detail="Course does not exist"
        )

    # activities
    coursechapter_activityIds_global = []

    # chapters
    chapters = {}
    if coursechapters["chapters_content"]:
        for coursechapter in coursechapters["chapters_content"]:
            coursechapter = CourseChapterInDB(**coursechapter)
            coursechapter_activityIds = []

            for activity in coursechapter.activities:
                coursechapter_activityIds.append(activity)
                coursechapter_activityIds_global.append(activity)

            chapters[coursechapter.coursechapter_id] = {
                "id": coursechapter.coursechapter_id,
                "name": coursechapter.name,
                "activityIds": coursechapter_activityIds,
            }

    # activities
    activities_list = {}
    for activity in await activities.find(
        {"activity_id": {"$in": coursechapter_activityIds_global}}
    ).to_list(length=100):
        activity = ActivityInDB(**activity)
        activities_list[activity.activity_id] = {
            "id": activity.activity_id,
            "name": activity.name,
            "type": activity.type,
            "content": activity.content,
        }

    final = {
        "chapters": chapters,
        "chapterOrder": coursechapters["chapters"],
        "activities": activities_list,
    }

    return final


async def update_coursechapters_meta(
    request: Request,
    course_id: str,
    coursechapters_metadata: CourseChapterMetaData,
    current_user: PublicUser,
):
    courses = request.app.db["courses"]

    await verify_rights(request, course_id, current_user, "update")

    # update chapters in course
    await courses.update_one(
        {"course_id": course_id},
        {"$set": {"chapters": coursechapters_metadata.chapterOrder}},
    )

    if coursechapters_metadata.chapters is not None:
        for (
            coursechapter_id,
            chapter_metadata,
        ) in coursechapters_metadata.chapters.items():
            filter_query = {"chapters_content.coursechapter_id": coursechapter_id}
            update_query = {
                "$set": {
                    "chapters_content.$.activities": chapter_metadata["activityIds"]
                }
            }
            result = await courses.update_one(filter_query, update_query)
            if result.matched_count == 0:
                # handle error when no documents are matched by the filter query
                print(f"No documents found for course chapter ID {coursechapter_id}")

    return {"detail": "coursechapters metadata updated"}


#### Security ####################################################


async def verify_rights(
    request: Request,
    course_id: str,
    current_user: PublicUser,
    action: Literal["read", "update", "delete"],
):
    courses = request.app.db["courses"]
    users = request.app.db["users"]
    user = await users.find_one({"user_id": current_user.user_id})
    course = await courses.find_one({"course_id": course_id})

    if not course:
        raise HTTPException(
            status_code=status.HTTP_409_CONFLICT, detail="Course does not exist"
        )

    if action == "read":
        if current_user.user_id == "anonymous":
            await authorization_verify_if_element_is_public(
                request, course_id, current_user.user_id, action
            )
        else:
            users = request.app.db["users"]
            user = await users.find_one({"user_id": current_user.user_id})

            await authorization_verify_if_user_is_anon(current_user.user_id)

            await authorization_verify_based_on_roles_and_authorship(
                request,
                current_user.user_id,
                action,
                user["roles"],
                course_id,
            )
    else:
        users = request.app.db["users"]
        user = await users.find_one({"user_id": current_user.user_id})
        
        await authorization_verify_if_user_is_anon(current_user.user_id)

        await authorization_verify_based_on_roles_and_authorship(
            request,
            current_user.user_id,
            action,
            user["roles"],
            course_id,
        )


#### Security ####################################################