use crate::database;
use crate::database::models::project_item::QueryProject;
use crate::database::models::version_item::QueryVersion;
use crate::database::models::Collection;
use crate::database::redis::RedisPool;
use crate::database::{models, Project, Version};
use crate::models::users::User;
use crate::routes::ApiError;
use actix_web::web;
use sqlx::PgPool;

pub trait ValidateAuthorized {
    fn validate_authorized(&self, user_option: Option<&User>) -> Result<(), ApiError>;
}

pub trait ValidateAllAuthorized {
    fn validate_all_authorized(self, user_option: Option<&User>) -> Result<(), ApiError>;
}

impl<'a, T, A> ValidateAllAuthorized for T
where
    T: IntoIterator<Item = &'a A>,
    A: ValidateAuthorized + 'a,
{
    fn validate_all_authorized(self, user_option: Option<&User>) -> Result<(), ApiError> {
        self.into_iter()
            .try_for_each(|c| c.validate_authorized(user_option))
    }
}

pub async fn is_authorized(
    project_data: &Project,
    user_option: &Option<User>,
    pool: &web::Data<PgPool>,
) -> Result<bool, ApiError> {
    let mut authorized = !project_data.status.is_hidden();

    if let Some(user) = &user_option {
        if !authorized {
            if user.role.is_mod() {
                authorized = true;
            } else {
                let user_id: models::ids::UserId = user.id.into();

                let project_exists = sqlx::query!(
                    "SELECT EXISTS(SELECT 1 FROM team_members WHERE team_id = $1 AND user_id = $2)",
                    project_data.team_id as database::models::ids::TeamId,
                    user_id as database::models::ids::UserId,
                )
                .fetch_one(&***pool)
                .await?
                .exists;

                let organization_exists =
                    if let Some(organization_id) = project_data.organization_id {
                        sqlx::query!(
                            "SELECT EXISTS(
                            SELECT 1 
                            FROM organizations o JOIN team_members tm ON tm.team_id = o.team_id
                            WHERE o.id = $1 AND tm.user_id = $2
                        )",
                            organization_id as database::models::ids::OrganizationId,
                            user_id as database::models::ids::UserId,
                        )
                        .fetch_one(&***pool)
                        .await?
                        .exists
                    } else {
                        None
                    };

                authorized =
                    project_exists.unwrap_or(false) || organization_exists.unwrap_or(false);
            }
        }
    }

    Ok(authorized)
}

pub async fn filter_authorized_projects(
    projects: Vec<QueryProject>,
    user_option: &Option<User>,
    pool: &web::Data<PgPool>,
) -> Result<Vec<crate::models::projects::Project>, ApiError> {
    let mut return_projects = Vec::new();
    let mut check_projects = Vec::new();

    for project in projects {
        if !project.inner.status.is_hidden()
            || user_option
                .as_ref()
                .map(|x| x.role.is_mod())
                .unwrap_or(false)
        {
            return_projects.push(project.into());
        } else if user_option.is_some() {
            check_projects.push(project);
        }
    }

    if !check_projects.is_empty() {
        if let Some(user) = user_option {
            let user_id: models::ids::UserId = user.id.into();

            use futures::TryStreamExt;

            sqlx::query!(
                "
                SELECT m.id id, m.team_id team_id FROM team_members tm
                INNER JOIN mods m ON m.team_id = tm.team_id
                WHERE tm.team_id = ANY($1) AND tm.user_id = $3

                UNION

                SELECT m.id id, m.team_id team_id FROM team_members tm
                INNER JOIN organizations o ON o.team_id = tm.team_id
                INNER JOIN mods m ON m.organization_id = o.id
                WHERE o.id = ANY($2) AND tm.user_id = $3
                ",
                &check_projects
                    .iter()
                    .map(|x| x.inner.team_id.0)
                    .collect::<Vec<_>>(),
                &check_projects
                    .iter()
                    .filter_map(|x| x.inner.organization_id.map(|x| x.0))
                    .collect::<Vec<_>>(),
                user_id as database::models::ids::UserId,
            )
            .fetch_many(&***pool)
            .try_for_each(|e| {
                if let Some(row) = e.right() {
                    check_projects.retain(|x| {
                        let bool =
                            Some(x.inner.id.0) == row.id && Some(x.inner.team_id.0) == row.team_id;

                        if bool {
                            return_projects.push(x.clone().into());
                        }

                        !bool
                    });
                }

                futures::future::ready(Ok(()))
            })
            .await?;
        }
    }

    Ok(return_projects)
}

pub async fn is_authorized_version(
    version_data: &Version,
    user_option: &Option<User>,
    pool: &web::Data<PgPool>,
) -> Result<bool, ApiError> {
    let mut authorized = !version_data.status.is_hidden();

    if let Some(user) = &user_option {
        if !authorized {
            if user.role.is_mod() {
                authorized = true;
            } else {
                let user_id: models::ids::UserId = user.id.into();

                let version_exists = sqlx::query!(
                    "SELECT EXISTS(
                        SELECT 1 FROM mods m 
                        INNER JOIN team_members tm ON tm.team_id = m.team_id AND user_id = $2 
                        WHERE m.id = $1
                    )",
                    version_data.project_id as database::models::ids::ProjectId,
                    user_id as database::models::ids::UserId,
                )
                .fetch_one(&***pool)
                .await?
                .exists;

                let version_organization_exists = sqlx::query!(
                    "SELECT EXISTS(
                        SELECT 1 FROM mods m 
                        INNER JOIN organizations o ON m.organization_id = o.id
                        INNER JOIN team_members tm ON tm.team_id = o.team_id AND user_id = $2 
                        WHERE m.id = $1
                    )",
                    version_data.project_id as database::models::ids::ProjectId,
                    user_id as database::models::ids::UserId,
                )
                .fetch_one(&***pool)
                .await?
                .exists;

                authorized = version_exists
                    .or(version_organization_exists)
                    .unwrap_or(false);
            }
        }
    }

    Ok(authorized)
}

impl ValidateAuthorized for models::OAuthClient {
    fn validate_authorized(&self, user_option: Option<&User>) -> Result<(), ApiError> {
        if let Some(user) = user_option {
            return if user.role.is_mod() || user.id == self.created_by.into() {
                Ok(())
            } else {
                Err(ApiError::CustomAuthentication(
                    "You don't have sufficient permissions to interact with this OAuth application"
                        .to_string(),
                ))
            };
        }

        Ok(())
    }
}

pub async fn filter_authorized_versions(
    versions: Vec<QueryVersion>,
    user_option: &Option<User>,
    pool: &web::Data<PgPool>,
    redis: web::Data<RedisPool>,
) -> Result<Vec<crate::models::projects::Version>, ApiError> {
    let mut return_versions = Vec::new();

    let project_ids = versions
        .iter()
        .map(|x| x.inner.project_id)
        .collect::<Vec<_>>();

    let authorized_projects = filter_authorized_projects(
        Project::get_many_ids(&project_ids, &***pool, &redis).await?,
        user_option,
        pool,
    )
    .await?;

    let authorized_project_ids: Vec<_> = authorized_projects.iter().map(|x| x.id.into()).collect();

    for version in versions {
        if !version.inner.status.is_hidden()
            || user_option
                .as_ref()
                .map(|x| x.role.is_mod())
                .unwrap_or(false)
            || (user_option.is_some() && authorized_project_ids.contains(&version.inner.project_id))
        {
            return_versions.push(version.into());
        }
    }

    Ok(return_versions)
}

pub async fn is_authorized_collection(
    collection_data: &Collection,
    user_option: &Option<User>,
) -> Result<bool, ApiError> {
    let mut authorized = !collection_data.status.is_hidden();

    if let Some(user) = &user_option {
        if !authorized && (user.role.is_mod() || user.id == collection_data.user_id.into()) {
            authorized = true;
        }
    }

    Ok(authorized)
}

pub async fn filter_authorized_collections(
    collections: Vec<Collection>,
    user_option: &Option<User>,
    pool: &web::Data<PgPool>,
) -> Result<Vec<crate::models::collections::Collection>, ApiError> {
    let mut return_collections = Vec::new();
    let mut check_collections = Vec::new();

    for collection in collections {
        if !collection.status.is_hidden()
            || user_option
                .as_ref()
                .map(|x| x.role.is_mod())
                .unwrap_or(false)
        {
            return_collections.push(collection.into());
        } else if user_option.is_some() {
            check_collections.push(collection);
        }
    }

    if !check_collections.is_empty() {
        if let Some(user) = user_option {
            let user_id: models::ids::UserId = user.id.into();

            use futures::TryStreamExt;

            sqlx::query!(
                "
                SELECT c.id id, c.user_id user_id FROM collections c
                WHERE c.user_id = $2 AND c.id = ANY($1)
                ",
                &check_collections.iter().map(|x| x.id.0).collect::<Vec<_>>(),
                user_id as database::models::ids::UserId,
            )
            .fetch_many(&***pool)
            .try_for_each(|e| {
                if let Some(row) = e.right() {
                    check_collections.retain(|x| {
                        let bool = x.id.0 == row.id && x.user_id.0 == row.user_id;

                        if bool {
                            return_collections.push(x.clone().into());
                        }

                        !bool
                    });
                }

                futures::future::ready(Ok(()))
            })
            .await?;
        }
    }

    Ok(return_collections)
}