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use nu_engine::CallExt;
use nu_protocol::{
    ast::Call,
    engine::{Command, EngineState, Stack},
    Category, Example, IntoPipelineData, PipelineData, Signature, Span, SyntaxShape, Value,
};

#[derive(Clone)]
pub struct SubCommand;

impl Command for SubCommand {
    fn name(&self) -> &str {
        "split list"
    }

    fn signature(&self) -> Signature {
        Signature::build("split list")
            .required(
                "separator",
                SyntaxShape::Any,
                "the value that denotes what separates the list",
            )
            .category(Category::Filters)
    }

    fn usage(&self) -> &str {
        "Split a list into multiple lists using a separator"
    }

    fn search_terms(&self) -> Vec<&str> {
        vec!["list", "separate", "divide"]
    }

    fn run(
        &self,
        engine_state: &EngineState,
        stack: &mut Stack,
        call: &Call,
        input: PipelineData,
    ) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
        split_list(engine_state, stack, call, input)
    }

    fn examples(&self) -> Vec<Example> {
        vec![
            Example {
                description: "Split a list of chars into two lists",
                example: "[a, b, c, d, e, f, g] | split list d",
                result: Some(Value::List {
                    vals: vec![
                        Value::List {
                            vals: vec![
                                Value::test_string("a"),
                                Value::test_string("b"),
                                Value::test_string("c"),
                            ],
                            span: Span::test_data(),
                        },
                        Value::List {
                            vals: vec![
                                Value::test_string("e"),
                                Value::test_string("f"),
                                Value::test_string("g"),
                            ],
                            span: Span::test_data(),
                        },
                    ],
                    span: Span::test_data(),
                }),
            },
            Example {
                description: "Split a list of lists into two lists of lists",
                example: "[[1,2], [2,3], [3,4]] | split list [2,3]",
                result: Some(Value::List {
                    vals: vec![
                        Value::List {
                            vals: vec![Value::List {
                                vals: vec![Value::test_int(1), Value::test_int(2)],
                                span: Span::test_data(),
                            }],
                            span: Span::test_data(),
                        },
                        Value::List {
                            vals: vec![Value::List {
                                vals: vec![Value::test_int(3), Value::test_int(4)],
                                span: Span::test_data(),
                            }],
                            span: Span::test_data(),
                        },
                    ],
                    span: Span::test_data(),
                }),
            },
        ]
    }
}

fn split_list(
    engine_state: &EngineState,
    stack: &mut Stack,
    call: &Call,
    input: PipelineData,
) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
    let separator: Value = call.req(engine_state, stack, 0)?;
    let mut temp_list = Vec::new();
    let mut returned_list = Vec::new();
    let iter = input.into_interruptible_iter(engine_state.ctrlc.clone());
    for val in iter {
        if val == separator && !temp_list.is_empty() {
            returned_list.push(Value::List {
                vals: temp_list.clone(),
                span: call.head,
            });
            temp_list = Vec::new();
        } else {
            temp_list.push(val);
        }
    }
    if !temp_list.is_empty() {
        returned_list.push(Value::List {
            vals: temp_list.clone(),
            span: call.head,
        });
    }
    Ok(Value::List {
        vals: returned_list,
        span: call.head,
    }
    .into_pipeline_data())
}