use crate::*;
use std::sync::Arc;

/// Represents the text content within an XML element
#[derive(Clone, Debug)]
pub struct TextContent {
    element: Arc<schema::XsElement>,
}

impl TextContent {
    pub fn new(element: Arc<schema::XsElement>) -> Self {
        Self { element }
    }

    pub fn append(self, c: char) -> Vec<Token> {
        if c == '<' {
            let is_mixed = self
                .element
                .xs_complex_type
                .mixed
                .as_ref()
                .map(|val| val == "true")
                .unwrap_or(false);
                
            let mut tokens = vec![Token::ElementCloseStart(ElementCloseStart::new(
                Arc::clone(&self.element),
            ))];
            
            // If mixed content is allowed, also add Comment and CData as possible transitions
            if is_mixed {
                tokens.push(Token::Comment(Comment::new(Arc::clone(&self.element))));
                tokens.push(Token::CData(CData::new(Arc::clone(&self.element))));
            }
            
            tokens
        } else {
            vec![Token::TextContent(TextContent::new(Arc::clone(
                &self.element,
            )))]
        }
    }
}

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

    #[test]
    fn test_valid_text_content() {
        let values = [
            "<reasoning>text",
            "<reasoning>Hello world",
            "<reasoning>Special chars: !@#$%^&*()",
            "<reasoning>Numbers: 12345",
            "<reasoning>Mixed content with spaces",
            "<write_stdout>Output message",
            "<single>ls -la /tmp",
        ];

        for value in values {
            let mut validator = crate::tests::example_validator();
            validator.append(value).expect(value);
            assert!(!validator.current_tokens.is_empty(), "{value}");
            assert!(
                validator
                    .current_tokens
                    .iter()
                    .any(|token| matches!(token, Token::TextContent(_))),
                "{value}"
            );
        }
    }

    #[test]
    fn test_whitespace_text_content() {
        let values = [
            "<reasoning> ",
            "<reasoning>  ",
            "<reasoning>\t",
            "<reasoning>\n",
            "<reasoning> \t\n ",
            "<write_stdout> ",
            "<single> ",
        ];

        for value in values {
            let mut validator = crate::tests::example_validator();
            validator.append(value).expect(value);
            assert!(!validator.current_tokens.is_empty(), "{value}");
            assert!(
                validator
                    .current_tokens
                    .iter()
                    .any(|token| matches!(token, Token::TextContent(_))),
                "{value}"
            );
        }
    }

    #[test]
    fn test_valid_element_close_start_after_text() {
        let values = [
            "<reasoning>text<",
            "<reasoning>Hello world<",
            "<write_stdout>message<",
            "<single>command<",
        ];

        for value in values {
            let mut validator = crate::tests::example_validator();
            validator.append(value).expect(value);
            assert!(!validator.current_tokens.is_empty(), "{value}");
            assert!(
                validator
                    .current_tokens
                    .iter()
                    .any(|token| matches!(token, Token::ElementCloseStart(_))),
                "{value}"
            );
        }
    }

    #[test]
    fn test_complete_element_with_text() {
        let values = [
            "<reasoning>text</reasoning>",
            "<reasoning>Hello world</reasoning>",
            "<write_stdout>message</write_stdout>",
            "<single>command</single>",
        ];

        for value in values {
            let mut validator = crate::tests::example_validator();
            validator.append(value).expect(value);
            assert!(!validator.current_tokens.is_empty(), "{value}");
            assert!(
                validator
                    .current_tokens
                    .iter()
                    .any(|token| matches!(token, Token::EndOfFile(_))),
                "{value}"
            );
        }
    }
    
    // New tests for transitions to comment and CDATA
    
    #[test]
    fn test_text_to_comment_transition() {
        let values = [
            "<reasoning>text<",
            "<reasoning>text<!",
            "<reasoning>text<!--",
            "<reasoning>text<!-- comment",
        ];

        for value in values {
            let mut validator = crate::tests::example_validator();
            validator.append(value).expect(value);
            assert!(!validator.current_tokens.is_empty(), "{value}");
            
            let is_valid = validator
                .current_tokens
                .iter()
                .any(|token| matches!(token, Token::Comment(_)));
            
            assert!(is_valid, "{value}");
        }
    }
    
    #[test]
    fn test_text_to_cdata_transition() {
        let values = [
            "<reasoning>text<",
            "<reasoning>text<!",
            "<reasoning>text<![",
            "<reasoning>text<![C",
            "<reasoning>text<![CD",
            "<reasoning>text<![CDA",
            "<reasoning>text<![CDAT",
            "<reasoning>text<![CDATA",
            "<reasoning>text<![CDATA[",
        ];

        for value in values {
            let mut validator = crate::tests::example_validator();
            validator.append(value).expect(value);
            assert!(!validator.current_tokens.is_empty(), "{value}");
            
            // Should transition to CDATA state or remain in TextContent for partial prefix
            let is_valid = validator
                .current_tokens
                .iter()
                .any(|token| matches!(token, Token::CData(_)));
            
            assert!(is_valid, "{value}");
        }
    }
    
    #[test]
    fn test_text_with_mixed_content() {
        let values = [
            "<reasoning>text<!-- comment -->more text</reasoning>",
            "<reasoning>text<![CDATA[cdata content]]>more text</reasoning>",
            "<reasoning>text<!-- comment --><![CDATA[cdata]]>more</reasoning>",
            "<reasoning><!-- c1 -->text<![CDATA[cd]]><!-- c2 --></reasoning>",
        ];

        for value in values {
            let mut validator = crate::tests::example_validator();
            validator.append(value).expect(value);
            assert!(!validator.current_tokens.is_empty(), "{value}");
            assert!(
                validator
                    .current_tokens
                    .iter()
                    .any(|token| matches!(token, Token::EndOfFile(_))),
                "{value}"
            );
        }
    }
}