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use std::io::Write;

use liquid_core::error::ResultLiquidReplaceExt;
use liquid_core::Language;
use liquid_core::Renderable;
use liquid_core::Result;
use liquid_core::Runtime;
use liquid_core::{BlockReflection, ParseBlock, TagBlock, TagTokenIter};

#[derive(Copy, Clone, Debug, Default)]
pub struct RawBlock;

impl RawBlock {
    pub fn new() -> Self {
        Self::default()
    }
}

impl BlockReflection for RawBlock {
    fn start_tag(&self) -> &str {
        "raw"
    }

    fn end_tag(&self) -> &str {
        "endraw"
    }

    fn description(&self) -> &str {
        ""
    }
}

impl ParseBlock for RawBlock {
    fn parse(
        &self,
        mut arguments: TagTokenIter<'_>,
        mut tokens: TagBlock<'_, '_>,
        _options: &Language,
    ) -> Result<Box<dyn Renderable>> {
        // no arguments should be supplied, trying to supply them is an error
        arguments.expect_nothing()?;

        let content = tokens.escape_liquid(false)?.to_string();

        tokens.assert_empty();
        Ok(Box::new(RawT { content }))
    }

    fn reflection(&self) -> &dyn BlockReflection {
        self
    }
}

#[derive(Clone, Debug)]
struct RawT {
    content: String,
}

impl Renderable for RawT {
    fn render_to(&self, writer: &mut dyn Write, _runtime: &dyn Runtime) -> Result<()> {
        write!(writer, "{}", self.content).replace("Failed to render")?;
        Ok(())
    }
}

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

    use liquid_core::parser;
    use liquid_core::runtime;
    use liquid_core::runtime::RuntimeBuilder;

    fn options() -> Language {
        let mut options = Language::default();
        options.blocks.register("raw".to_string(), RawBlock.into());
        options
    }

    fn unit_parse(text: &str) -> String {
        let options = options();
        let template = parser::parse(text, &options)
            .map(runtime::Template::new)
            .unwrap();

        let runtime = RuntimeBuilder::new().build();

        template.render(&runtime).unwrap()
    }

    #[test]
    fn raw_text() {
        let output = unit_parse("{%raw%}This is a test{%endraw%}");
        assert_eq!(output, "This is a test");
    }

    #[test]
    fn raw_escaped() {
        let output = unit_parse("{%raw%}{%if%}{%endraw%}");
        assert_eq!(output, "{%if%}");
    }

    #[test]
    fn raw_mixed() {
        let output = unit_parse("{%raw%}hello{%if%}world{%endraw%}");
        assert_eq!(output, "hello{%if%}world");
    }
}