use oiseau::cache::Cache;
use crate::database::common::NAME_REGEX;
use crate::model::{auth::User, journals::Note, permissions::FinePermission, Error, Result};
use crate::{auto_method, DataManager};
use oiseau::{execute, get, params, query_row, query_rows, PostgresRow};

impl DataManager {
    /// Get a [`Note`] from an SQL row.
    pub(crate) fn get_note_from_row(x: &PostgresRow) -> Note {
        Note {
            id: get!(x->0(i64)) as usize,
            created: get!(x->1(i64)) as usize,
            owner: get!(x->2(i64)) as usize,
            title: get!(x->3(String)),
            journal: get!(x->4(i64)) as usize,
            content: get!(x->5(String)),
            edited: get!(x->6(i64)) as usize,
            dir: get!(x->7(i64)) as usize,
            tags: serde_json::from_str(&get!(x->8(String))).unwrap(),
            is_global: get!(x->9(i32)) as i8 == 1,
        }
    }

    auto_method!(get_note_by_id(usize as i64)@get_note_from_row -> "SELECT * FROM notes WHERE id = $1" --name="note" --returns=Note --cache-key-tmpl="atto.note:{}");
    auto_method!(get_global_note_by_title(&str)@get_note_from_row -> "SELECT * FROM notes WHERE title = $1 AND is_global = 1" --name="note" --returns=Note --cache-key-tmpl="atto.note:{}");

    /// Get the number of global notes a user has.
    pub async fn get_user_global_notes_count(&self, owner: usize) -> Result<i32> {
        let conn = match self.0.connect().await {
            Ok(c) => c,
            Err(e) => return Err(Error::DatabaseConnection(e.to_string())),
        };

        let res = query_row!(
            &conn,
            "SELECT COUNT(*)::int FROM notes WHERE owner = $1 AND is_global = 1",
            &[&(owner as i64)],
            |x| Ok(x.get::<usize, i32>(0))
        );

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

        Ok(res.unwrap())
    }

    /// Get a note by `journal` and `title`.
    pub async fn get_note_by_journal_title(&self, journal: usize, title: &str) -> Result<Note> {
        let conn = match self.0.connect().await {
            Ok(c) => c,
            Err(e) => return Err(Error::DatabaseConnection(e.to_string())),
        };

        let res = query_row!(
            &conn,
            "SELECT * FROM notes WHERE journal = $1 AND title = $2",
            params![&(journal as i64), &title],
            |x| { Ok(Self::get_note_from_row(x)) }
        );

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

        Ok(res.unwrap())
    }

    /// Get all notes by journal.
    ///
    /// # Arguments
    /// * `id` - the ID of the journal to fetch notes for
    pub async fn get_notes_by_journal(&self, id: usize) -> Result<Vec<Note>> {
        let conn = match self.0.connect().await {
            Ok(c) => c,
            Err(e) => return Err(Error::DatabaseConnection(e.to_string())),
        };

        let res = query_rows!(
            &conn,
            "SELECT * FROM notes WHERE journal = $1 ORDER BY edited DESC",
            &[&(id as i64)],
            |x| { Self::get_note_from_row(x) }
        );

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

        Ok(res.unwrap())
    }

    /// Get all notes by journal with the given tag.
    ///
    /// # Arguments
    /// * `id` - the ID of the journal to fetch notes for
    /// * `tag`
    pub async fn get_notes_by_journal_tag(&self, id: usize, tag: &str) -> Result<Vec<Note>> {
        let conn = match self.0.connect().await {
            Ok(c) => c,
            Err(e) => return Err(Error::DatabaseConnection(e.to_string())),
        };

        let res = query_rows!(
            &conn,
            "SELECT * FROM notes WHERE journal = $1 AND tags::jsonb ? $2 ORDER BY edited DESC",
            params![&(id as i64), tag],
            |x| { Self::get_note_from_row(x) }
        );

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

        Ok(res.unwrap())
    }

    const MAXIMUM_FREE_NOTES_PER_JOURNAL: usize = 10;

    pub const MAXIMUM_FREE_GLOBAL_NOTES: usize = 10;
    pub const MAXIMUM_SUPPORTER_GLOBAL_NOTES: usize = 50;

    /// Create a new note in the database.
    ///
    /// # Arguments
    /// * `data` - a mock [`Note`] object to insert
    pub async fn create_note(&self, mut data: Note) -> Result<Note> {
        // check values
        if data.title.len() < 2 {
            return Err(Error::DataTooShort("title".to_string()));
        } else if data.title.len() > 64 {
            return Err(Error::DataTooLong("title".to_string()));
        }

        if data.content.len() < 2 {
            return Err(Error::DataTooShort("content".to_string()));
        } else if data.content.len() > 262144 {
            return Err(Error::DataTooLong("content".to_string()));
        }

        data.title = data.title.replace(" ", "_").to_lowercase();

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

        if !owner.permissions.check(FinePermission::SUPPORTER) {
            let journals = self.get_notes_by_journal(data.owner).await?;

            if journals.len() >= Self::MAXIMUM_FREE_NOTES_PER_JOURNAL {
                return Err(Error::MiscError(
                    "You already have the maximum number of notes you can have in this journal"
                        .to_string(),
                ));
            }
        }

        // check name
        let regex = regex::RegexBuilder::new(NAME_REGEX)
            .multi_line(true)
            .build()
            .unwrap();

        if regex.captures(&data.title).is_some() {
            return Err(Error::MiscError(
                "This title contains invalid characters".to_string(),
            ));
        }

        // make sure this title isn't already in use
        if self
            .get_note_by_journal_title(data.journal, &data.title)
            .await
            .is_ok()
        {
            return Err(Error::TitleInUse);
        }

        // check permission
        let journal = self.get_journal_by_id(data.journal).await?;

        if data.owner != journal.owner {
            return Err(Error::NotAllowed);
        }

        // ...
        let conn = match self.0.connect().await {
            Ok(c) => c,
            Err(e) => return Err(Error::DatabaseConnection(e.to_string())),
        };

        let res = execute!(
            &conn,
            "INSERT INTO notes VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10)",
            params![
                &(data.id as i64),
                &(data.created as i64),
                &(data.owner as i64),
                &data.title,
                &(data.journal as i64),
                &data.content,
                &(data.edited as i64),
                &(data.dir as i64),
                &serde_json::to_string(&data.tags).unwrap(),
                &if data.is_global { 1 } else { 0 }
            ]
        );

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

        Ok(data)
    }

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

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

        // ...
        let conn = match self.0.connect().await {
            Ok(c) => c,
            Err(e) => return Err(Error::DatabaseConnection(e.to_string())),
        };

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

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

        // ...
        self.cache_clear_note(&note).await;
        Ok(())
    }

    /// Delete all notes by dir ID.
    ///
    /// # Arguments
    /// * `journal`
    /// * `dir`
    pub async fn delete_notes_by_journal_dir(
        &self,
        journal: usize,
        dir: usize,
        user: &User,
    ) -> Result<()> {
        let journal = self.get_journal_by_id(journal).await?;

        if journal.owner != user.id && !user.permissions.check(FinePermission::MANAGE_NOTES) {
            return Err(Error::NotAllowed);
        }

        // ...
        let conn = match self.0.connect().await {
            Ok(c) => c,
            Err(e) => return Err(Error::DatabaseConnection(e.to_string())),
        };

        let res = execute!(
            &conn,
            "DELETE FROM notes WHERE dir = $1 AND journal = $2 ORDER BY edited DESC",
            &[&(dir as i64), &(journal.id as i64)]
        );

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

        Ok(())
    }

    /// Incremenet note views. Views are only stored in the cache.
    ///
    /// This should only be done for global notes.
    pub async fn incr_note_views(&self, id: usize) {
        self.0.1.incr(format!("atto.note:{id}/views")).await;
    }

    pub async fn get_note_views(&self, id: usize) -> Option<String> {
        self.0.1.get(format!("atto.note:{id}/views")).await
    }

    pub async fn cache_clear_note(&self, x: &Note) {
        self.0.1.remove(format!("atto.note:{}", x.id)).await;
        self.0.1.remove(format!("atto.note:{}", x.title)).await;
    }

    auto_method!(update_note_title(&str)@get_note_by_id:FinePermission::MANAGE_NOTES; -> "UPDATE notes SET title = $1 WHERE id = $2" --cache-key-tmpl=cache_clear_note);
    auto_method!(update_note_content(&str)@get_note_by_id:FinePermission::MANAGE_NOTES; -> "UPDATE notes SET content = $1 WHERE id = $2" --cache-key-tmpl=cache_clear_note);
    auto_method!(update_note_dir(i64)@get_note_by_id:FinePermission::MANAGE_NOTES; -> "UPDATE notes SET dir = $1 WHERE id = $2" --cache-key-tmpl=cache_clear_note);
    auto_method!(update_note_tags(Vec<String>)@get_note_by_id:FinePermission::MANAGE_NOTES; -> "UPDATE notes SET tags = $1 WHERE id = $2" --serde --cache-key-tmpl=cache_clear_note);
    auto_method!(update_note_edited(i64)@get_note_by_id -> "UPDATE notes SET edited = $1 WHERE id = $2" --cache-key-tmpl=cache_clear_note);
    auto_method!(update_note_is_global(i32)@get_note_by_id -> "UPDATE notes SET is_global = $1 WHERE id = $2" --cache-key-tmpl=cache_clear_note);
}