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use chrono_tz::TZ_VARIANTS;
use nu_protocol::ast::Call;
use nu_protocol::engine::{Command, EngineState, Stack};
use nu_protocol::{
    Category, Example, IntoInterruptiblePipelineData, PipelineData, ShellError, Signature, Span,
    Type, Value,
};

#[derive(Clone)]
pub struct SubCommand;

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

    fn signature(&self) -> Signature {
        Signature::build("date list-timezone")
            .input_output_types(vec![(Type::Nothing, Type::Table(vec![]))])
            .category(Category::Date)
    }

    fn usage(&self) -> &str {
        "List supported time zones."
    }

    fn search_terms(&self) -> Vec<&str> {
        vec!["UTC", "GMT", "tz"]
    }

    fn run(
        &self,
        engine_state: &EngineState,
        _stack: &mut Stack,
        call: &Call,
        _input: PipelineData,
    ) -> Result<PipelineData, ShellError> {
        let span = call.head;

        Ok(TZ_VARIANTS
            .iter()
            .map(move |x| {
                let cols = vec!["timezone".into()];
                let vals = vec![Value::String {
                    val: x.name().to_string(),
                    span,
                }];
                Value::Record { cols, vals, span }
            })
            .into_pipeline_data(engine_state.ctrlc.clone()))
    }

    fn examples(&self) -> Vec<Example> {
        vec![Example {
            example: "date list-timezone | where timezone =~ Shanghai",
            description: "Show timezone(s) that contains 'Shanghai'",
            result: Some(Value::List {
                vals: vec![Value::Record {
                    cols: vec!["timezone".into()],
                    vals: vec![Value::test_string("Asia/Shanghai")],
                    span: Span::test_data(),
                }],
                span: Span::test_data(),
            }),
        }]
    }
}