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use std::fmt::Debug;

use anyhow::Result;

use polars::prelude::*;

use crate::ids::codes::*;
use crate::util::default;

pub trait EdgeRead: Debug {
    fn read_edges(&self) -> Result<LazyFrame>;
}

pub trait NodeRead: Debug {
    fn read_node_ids(&self) -> Result<LazyFrame>;
}

#[derive(Debug)]
pub struct ISBN;
#[derive(Debug)]
pub struct LOC;
#[derive(Debug)]
pub struct OLEditions;
#[derive(Debug)]
pub struct OLWorks;
#[derive(Debug)]
pub struct GRBooks;
#[derive(Debug)]
pub struct GRWorks;

/// Get an ID column and apply the appropriate namespace adjustment.
fn id_col(name: &str, ns: NS<'_>) -> Expr {
    col(name) + lit(ns.base())
}

impl NodeRead for ISBN {
    fn read_node_ids(&self) -> Result<LazyFrame> {
        let df = LazyFrame::scan_parquet("book-links/all-isbns.parquet", default())?;
        let df = df.select([
            id_col("isbn_id", NS_ISBN).alias("code"),
            col("isbn").alias("label"),
        ]);
        Ok(df)
    }
}

impl NodeRead for LOC {
    fn read_node_ids(&self) -> Result<LazyFrame> {
        let df = LazyFrame::scan_parquet("loc-mds/book-ids.parquet", default())?;
        let df = df.select([id_col("rec_id", NS_LOC_REC).alias("code")]);
        Ok(df)
    }
}

impl EdgeRead for LOC {
    fn read_edges(&self) -> Result<LazyFrame> {
        let df = LazyFrame::scan_parquet("loc-mds/book-isbn-ids.parquet", default())?;
        let df = df.select([
            id_col("isbn_id", NS_ISBN).alias("src"),
            id_col("rec_id", NS_LOC_REC).alias("dst"),
        ]);
        Ok(df)
    }
}

impl NodeRead for OLEditions {
    fn read_node_ids(&self) -> Result<LazyFrame> {
        let df = LazyFrame::scan_parquet("openlibrary/editions.parquet", default())?;
        let df = df.select([id_col("id", NS_EDITION).alias("code")]);
        Ok(df)
    }
}

impl EdgeRead for OLEditions {
    fn read_edges(&self) -> Result<LazyFrame> {
        let df = LazyFrame::scan_parquet("openlibrary/edition-isbn-ids.parquet", default())?;
        let df = df.select([
            id_col("isbn_id", NS_ISBN).alias("src"),
            id_col("edition", NS_EDITION).alias("dst"),
        ]);
        Ok(df)
    }
}

impl NodeRead for OLWorks {
    fn read_node_ids(&self) -> Result<LazyFrame> {
        let df = LazyFrame::scan_parquet("openlibrary/all-works.parquet", default())?;
        let df = df.select([
            id_col("id", NS_WORK).alias("code"),
            col("key").alias("label"),
        ]);
        Ok(df)
    }
}

impl EdgeRead for OLWorks {
    fn read_edges(&self) -> Result<LazyFrame> {
        let df = LazyFrame::scan_parquet("openlibrary/edition-works.parquet", default())?;
        let df = df.select([
            id_col("edition", NS_EDITION).alias("src"),
            id_col("work", NS_WORK).alias("dst"),
        ]);
        Ok(df)
    }
}

impl NodeRead for GRBooks {
    fn read_node_ids(&self) -> Result<LazyFrame> {
        let df = LazyFrame::scan_parquet("goodreads/gr-book-ids.parquet", default())?;
        let df = df.select([id_col("book_id", NS_GR_BOOK).alias("code")]);
        Ok(df)
    }
}

impl EdgeRead for GRBooks {
    fn read_edges(&self) -> Result<LazyFrame> {
        let df = LazyFrame::scan_parquet("goodreads/book-isbn-ids.parquet", default())?;
        let df = df.select([
            id_col("isbn_id", NS_ISBN).alias("src"),
            id_col("book_id", NS_GR_BOOK).alias("dst"),
        ]);
        Ok(df)
    }
}

impl NodeRead for GRWorks {
    fn read_node_ids(&self) -> Result<LazyFrame> {
        let df = LazyFrame::scan_parquet("goodreads/gr-book-ids.parquet", default())?;
        let df = df.filter(col("work_id").is_not_null());
        let df = df.select([id_col("work_id", NS_GR_WORK).alias("code")]);
        Ok(df)
    }
}

impl EdgeRead for GRWorks {
    fn read_edges(&self) -> Result<LazyFrame> {
        let df = LazyFrame::scan_parquet("goodreads/gr-book-ids.parquet", default())?;
        let df = df.filter(col("work_id").is_not_null());
        let df = df.select([
            id_col("book_id", NS_GR_BOOK).alias("src"),
            id_col("work_id", NS_GR_WORK).alias("dst"),
        ]);
        Ok(df)
    }
}