use crate::commands::WholeStreamCommand;
use crate::prelude::*;
use crate::TaggedListBuilder;
use calamine::*;
use nu_errors::ShellError;
use nu_protocol::{ReturnSuccess, Signature, TaggedDictBuilder, UntaggedValue};
use std::io::Cursor;

pub struct FromODS;

#[derive(Deserialize)]
pub struct FromODSArgs {
    headerless: bool,
}

#[async_trait]
impl WholeStreamCommand for FromODS {
    fn name(&self) -> &str {
        "from ods"
    }

    fn signature(&self) -> Signature {
        Signature::build("from ods").switch(
            "headerless",
            "don't treat the first row as column names",
            None,
        )
    }

    fn usage(&self) -> &str {
        "Parse OpenDocument Spreadsheet(.ods) data and create table."
    }

    async fn run(
        &self,
        args: CommandArgs,
        registry: &CommandRegistry,
    ) -> Result<OutputStream, ShellError> {
        from_ods(args, registry)
    }
}

fn from_ods(args: CommandArgs, registry: &CommandRegistry) -> Result<OutputStream, ShellError> {
    let tag = args.call_info.name_tag.clone();
    let registry = registry.clone();

    let stream = async_stream! {
        let (FromODSArgs { headerless: _headerless }, mut input) = args.process(&registry).await?;
        let bytes = input.collect_binary(tag.clone()).await?;
        let mut buf: Cursor<Vec<u8>> = Cursor::new(bytes.item);
        let mut ods = Ods::<_>::new(buf).map_err(|_| ShellError::labeled_error(
            "Could not load ods file",
            "could not load ods file",
            &tag))?;

        let mut dict = TaggedDictBuilder::new(&tag);

        let sheet_names = ods.sheet_names().to_owned();

        for sheet_name in &sheet_names {
            let mut sheet_output = TaggedListBuilder::new(&tag);

            if let Some(Ok(current_sheet)) = ods.worksheet_range(sheet_name) {
                for row in current_sheet.rows() {
                    let mut row_output = TaggedDictBuilder::new(&tag);
                    for (i, cell) in row.iter().enumerate() {
                        let value = match cell {
                            DataType::Empty => UntaggedValue::nothing(),
                            DataType::String(s) => UntaggedValue::string(s),
                            DataType::Float(f) => UntaggedValue::decimal(*f),
                            DataType::Int(i) => UntaggedValue::int(*i),
                            DataType::Bool(b) => UntaggedValue::boolean(*b),
                            _ => UntaggedValue::nothing(),
                        };

                        row_output.insert_untagged(&format!("Column{}", i), value);
                    }

                    sheet_output.push_untagged(row_output.into_untagged_value());
                }

                dict.insert_untagged(sheet_name, sheet_output.into_untagged_value());
            } else {
                yield Err(ShellError::labeled_error(
                    "Could not load sheet",
                    "could not load sheet",
                    &tag));
            }
        }

        yield ReturnSuccess::value(dict.into_value());
    };

    Ok(stream.to_output_stream())
}

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

    #[test]
    fn examples_work_as_expected() {
        use crate::examples::test as test_examples;

        test_examples(FromODS {})
    }
}