use std::path::Path;

use r2d2::Pool;
use r2d2_sqlite::SqliteConnectionManager;

use crate::data::{
    author::Author, book::Book, error::DataStoreError, pagination::SortOrder, series::Series,
};

#[derive(Debug, Clone)]
pub struct Calibre {
    pool: Pool<SqliteConnectionManager>,
}

impl Calibre {
    pub fn load(path: &Path) -> Result<Self, DataStoreError> {
        let manager = SqliteConnectionManager::file(path);
        let pool = r2d2::Pool::new(manager)?;

        Ok(Self { pool })
    }

    pub fn books(
        &self,
        limit: u64,
        cursor: Option<&str>,
        sort_order: SortOrder,
    ) -> Result<Vec<Book>, DataStoreError> {
        let conn = self.pool.get()?;
        Book::multiple(&conn, limit, cursor, sort_order)
    }

    pub fn authors(
        &self,
        limit: u64,
        cursor: Option<&str>,
        sort_order: &SortOrder,
    ) -> Result<Vec<Author>, DataStoreError> {
        let conn = self.pool.get()?;
        Author::multiple(&conn, limit, cursor, sort_order)
    }

    pub fn author_books(
        &self,
        author_id: u64,
        limit: u64,
        cursor: Option<&str>,
        sort_order: SortOrder,
    ) -> Result<Vec<Book>, DataStoreError> {
        let conn = self.pool.get()?;
        Book::author_books(&conn, author_id, limit, cursor, sort_order)
    }

    pub fn recent_books(&self, limit: u64) -> Result<Vec<Book>, DataStoreError> {
        let conn = self.pool.get()?;
        Book::recents(&conn, limit)
    }

    pub fn scalar_book(&self, id: u64) -> Result<Book, DataStoreError> {
        let conn = self.pool.get()?;
        Book::scalar_book(&conn, id)
    }

    pub fn book_author(&self, id: u64) -> Result<Author, DataStoreError> {
        let conn = self.pool.get()?;
        Author::book_author(&conn, id)
    }

    pub fn series(
        &self,
        limit: u64,
        cursor: Option<&str>,
        sort_order: SortOrder,
    ) -> Result<Vec<Series>, DataStoreError> {
        let conn = self.pool.get()?;
        Series::multiple(&conn, limit, cursor, sort_order)
    }

    pub fn book_series(&self, id: u64) -> Result<Option<(Series, f64)>, DataStoreError> {
        let conn = self.pool.get()?;
        Series::book_series(&conn, id)
    }

    pub fn has_previous_authors(&self, author_sort: &str) -> Result<bool, DataStoreError> {
        let conn = self.pool.get()?;
        Author::has_previous_authors(&conn, author_sort)
    }

    pub fn has_more_authors(&self, author_sort: &str) -> Result<bool, DataStoreError> {
        let conn = self.pool.get()?;
        Author::has_more_authors(&conn, author_sort)
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    fn init_calibre() -> Calibre {
        Calibre::load(Path::new("./testdata/metadata.db")).unwrap()
    }

    #[test]
    fn books() {
        let c = init_calibre();
        let books = c.books(10, None, SortOrder::ASC).unwrap();
        assert_eq!(books.len(), 4);
    }

    #[test]
    fn authors() {
        let c = init_calibre();
        let authors = c.authors(10, None, &SortOrder::ASC).unwrap();
        assert_eq!(authors.len(), 3);
    }

    #[test]
    fn author_books() {
        let c = init_calibre();
        let books = c.author_books(1, 10, None, SortOrder::ASC).unwrap();
        assert_eq!(books.len(), 2);
    }

    #[test]
    fn pagination() {
        let c = init_calibre();
        let authors = c.authors(1, None, &SortOrder::ASC).unwrap();
        assert_eq!(authors.len(), 1);
        assert_eq!(authors[0].name, "Kevin R. Grazier");

        let authors = c
            .authors(1, Some(&authors[0].sort), &SortOrder::ASC)
            .unwrap();
        assert_eq!(authors.len(), 1);
        assert_eq!(authors[0].name, "Terry Pratchett");

        let authors = c
            .authors(1, Some(&authors[0].sort), &SortOrder::ASC)
            .unwrap();
        assert_eq!(authors.len(), 1);
        assert_eq!(authors[0].name, "Edward Noyes Westcott");

        let authors = c
            .authors(1, Some(&authors[0].sort), &SortOrder::DESC)
            .unwrap();
        assert_eq!(authors.len(), 1);
        assert_eq!(authors[0].name, "Terry Pratchett");
    }
}