use super::*;
use crate::cache::Cache;
use crate::model::communities::{Community, Post, Question};
use crate::model::stacks::{StackMode, StackSort};
use crate::model::{
    Error, Result,
    auth::User,
    permissions::FinePermission,
    stacks::{StackPrivacy, UserStack},
};
use crate::{auto_method, execute, get, query_row, query_rows, params};

#[cfg(feature = "sqlite")]
use rusqlite::Row;

#[cfg(feature = "postgres")]
use tokio_postgres::Row;

impl DataManager {
    /// Get a [`UserStack`] from an SQL row.
    pub(crate) fn get_stack_from_row(
        #[cfg(feature = "sqlite")] x: &Row<'_>,
        #[cfg(feature = "postgres")] x: &Row,
    ) -> UserStack {
        UserStack {
            id: get!(x->0(i64)) as usize,
            created: get!(x->1(i64)) as usize,
            owner: get!(x->2(i64)) as usize,
            name: get!(x->3(String)),
            users: serde_json::from_str(&get!(x->4(String))).unwrap(),
            privacy: serde_json::from_str(&get!(x->5(String))).unwrap(),
            mode: serde_json::from_str(&get!(x->6(String))).unwrap(),
            sort: serde_json::from_str(&get!(x->7(String))).unwrap(),
        }
    }

    auto_method!(get_stack_by_id(usize as i64)@get_stack_from_row -> "SELECT * FROM stacks WHERE id = $1" --name="stack" --returns=UserStack --cache-key-tmpl="atto.stack:{}");

    pub async fn get_stack_posts(
        &self,
        as_user_id: usize,
        id: usize,
        batch: usize,
        page: usize,
        ignore_users: &Vec<usize>,
    ) -> Result<
        Vec<(
            Post,
            User,
            Community,
            Option<(User, Post)>,
            Option<(Question, User)>,
        )>,
    > {
        let stack = self.get_stack_by_id(id).await?;

        Ok(match stack.mode {
            StackMode::Include => {
                self.fill_posts_with_community(
                    self.get_posts_from_stack(id, batch, page, stack.sort)
                        .await?,
                    as_user_id,
                    ignore_users,
                )
                .await?
            }
            StackMode::Exclude => {
                let ignore_users = [ignore_users.to_owned(), stack.users].concat();

                match stack.sort {
                    StackSort::Created => {
                        self.fill_posts_with_community(
                            self.get_latest_posts(batch, page).await?,
                            as_user_id,
                            &ignore_users,
                        )
                        .await?
                    }
                    StackSort::Likes => {
                        self.fill_posts_with_community(
                            self.get_popular_posts(batch, page, 604_800_000).await?,
                            as_user_id,
                            &ignore_users,
                        )
                        .await?
                    }
                }
            }
        })
    }

    /// Get all stacks by user.
    ///
    /// # Arguments
    /// * `id` - the ID of the user to fetch stacks for
    pub async fn get_stacks_by_owner(&self, id: usize) -> Result<Vec<UserStack>> {
        let conn = match self.connect().await {
            Ok(c) => c,
            Err(e) => return Err(Error::DatabaseConnection(e.to_string())),
        };

        let res = query_rows!(
            &conn,
            "SELECT * FROM stacks WHERE owner = $1 ORDER BY name ASC",
            &[&(id as i64)],
            |x| { Self::get_stack_from_row(x) }
        );

        if res.is_err() {
            return Err(Error::GeneralNotFound("stack".to_string()));
        }

        Ok(res.unwrap())
    }

    /// Create a new stack in the database.
    ///
    /// # Arguments
    /// * `data` - a mock [`UserStack`] object to insert
    pub async fn create_stack(&self, data: UserStack) -> Result<UserStack> {
        // check values
        if data.name.len() < 2 {
            return Err(Error::DataTooShort("title".to_string()));
        } else if data.name.len() > 32 {
            return Err(Error::DataTooLong("title".to_string()));
        }

        // check number of stacks
        let owner = self.get_user_by_id(data.owner).await?;

        if !owner.permissions.check(FinePermission::SUPPORTER) {
            let stacks = self.get_stacks_by_owner(data.owner).await?;
            let maximum_count = 5;

            if stacks.len() >= maximum_count {
                return Err(Error::MiscError(
                    "You already have the maximum number of stacks you can have".to_string(),
                ));
            }
        }

        // ...
        let conn = match self.connect().await {
            Ok(c) => c,
            Err(e) => return Err(Error::DatabaseConnection(e.to_string())),
        };

        let res = execute!(
            &conn,
            "INSERT INTO stacks VALUES ($1, $2, $3, $4, $5, $6, $7, $8)",
            params![
                &(data.id as i64),
                &(data.created as i64),
                &(data.owner as i64),
                &data.name,
                &serde_json::to_string(&data.users).unwrap(),
                &serde_json::to_string(&data.privacy).unwrap(),
                &serde_json::to_string(&data.mode).unwrap(),
                &serde_json::to_string(&data.sort).unwrap(),
            ]
        );

        if let Err(e) = res {
            return Err(Error::DatabaseError(e.to_string()));
        }

        Ok(data)
    }

    pub async fn delete_stack(&self, id: usize, user: &User) -> Result<()> {
        let stack = self.get_stack_by_id(id).await?;

        // check user permission
        if user.id != stack.owner {
            if !user.permissions.check(FinePermission::MANAGE_STACKS) {
                return Err(Error::NotAllowed);
            }
        }

        // ...
        let conn = match self.connect().await {
            Ok(c) => c,
            Err(e) => return Err(Error::DatabaseConnection(e.to_string())),
        };

        let res = execute!(&conn, "DELETE FROM stacks WHERE id = $1", &[&(id as i64)]);

        if let Err(e) = res {
            return Err(Error::DatabaseError(e.to_string()));
        }

        self.2.remove(format!("atto.stack:{}", id)).await;
        Ok(())
    }

    auto_method!(update_stack_name(&str)@get_stack_by_id:MANAGE_STACKS -> "UPDATE stacks SET name = $1 WHERE id = $2" --cache-key-tmpl="atto.stack:{}");
    auto_method!(update_stack_users(Vec<usize>)@get_stack_by_id:MANAGE_STACKS -> "UPDATE stacks SET users = $1 WHERE id = $2" --serde --cache-key-tmpl="atto.stack:{}");

    auto_method!(update_stack_privacy(StackPrivacy)@get_stack_by_id:MANAGE_STACKS -> "UPDATE stacks SET privacy = $1 WHERE id = $2" --serde --cache-key-tmpl="atto.stack:{}");
    auto_method!(update_stack_mode(StackMode)@get_stack_by_id:MANAGE_STACKS -> "UPDATE stacks SET mode = $1 WHERE id = $2" --serde --cache-key-tmpl="atto.stack:{}");
    auto_method!(update_stack_sort(StackSort)@get_stack_by_id:MANAGE_STACKS -> "UPDATE stacks SET sort = $1 WHERE id = $2" --serde --cache-key-tmpl="atto.stack:{}");
}