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extern crate regex;

use std::collections::HashMap;
use std::cmp::Eq;
use std::hash::Hash;

use regex::Regex;

fn find_all(text: &str, search: &str) -> Vec<usize> {
    let mut result = Vec::new();

    let mut start = 0;

    loop {
        //println!("{}", start);
        match text[start..].find(search) {
            Some(index) => {
                result.push(start + index);

                start = start + index + search.len();
            }
            None => break
        }
    }

    result
}

fn escape_html_script_text(text: &str) -> String {
    let index_array = find_all(text, "</script>");

    let mut s = String::new();

    let mut offset = 0;

    for index in index_array {
        s.push_str(&text[offset..(index + 1)]);
        s.push_str(r"\");
        offset = index + 1;
    }

    s.push_str(&text[offset..]);

    s
}

fn escape_quote(text: &str) -> String {
    let regex = Regex::new(r"([^\\]')|(^')").unwrap();

    let mut s = String::new();

    let mut offset = 0;

    for m in regex.find_iter(text) {
        let start = m.start();
        let end = m.end();

        if start == 0 {
            s.push_str(r"\'");
            offset = 1;
        } else {
            s.push_str(&text[offset..end - 1]);
            s.push_str(r"\");

            offset = end - 1;
        }
    }

    s.push_str(&text[offset..]);

    s
}

fn replace_new_line(text: &str) -> String {
    let regex = Regex::new(r"\n").unwrap();

    regex.replace_all(text, r"\n").to_string()
}

pub fn hash_map_to_javascript_html<K: ToString + Eq + Hash, V: ToString>(hash_map: &HashMap<K, V>, variable_name: &str, keys: &[K]) -> Result<String, String> {
    let mut s = String::new();

    let len_dec = keys.len() - 1;

    for (index, key) in keys.iter().enumerate() {
        let k = key.to_string();

        let v = match hash_map.get(key) {
            Some(s) => s.to_string(),
            None => return Err(format!("`{}` is not found.", k))
        };

        s.push_str(&format!("{}['{}'] = '{}'", variable_name, escape_html_script_text(&replace_new_line(&escape_quote(&k))), escape_html_script_text(&replace_new_line(&escape_quote(&v)))));

        if index < len_dec {
            s.push_str(";\n");
        } else {
            s.push_str(";");
        }
    }

    Ok(s)
}

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

    #[test]
    fn it_works() {
        let mut map: HashMap<&str, &str> = HashMap::new();

        map.insert("test-1", "Test 1!");
        map.insert("test-2", "Test 2!");
        map.insert("test-'3'", "Test '3'!");
        map.insert(r"test-\'4\'", r"Test \'4\'!");
        map.insert("script", "<script>alert('Hello world!');</script>");
        map.insert(r"'中'文", "<script>alert('Hello world!');</script><script>alert('哈囉，世界！');</script>");

        let html = hash_map_to_javascript_html(&map, "text", &vec!["test-1", "test-2", "test-'3'", r"test-\'4\'", "script", r"'中'文"]).unwrap();

        assert_eq!(r#"text['test-1'] = 'Test 1!';
text['test-2'] = 'Test 2!';
text['test-\'3\''] = 'Test \'3\'!';
text['test-\'4\''] = 'Test \'4\'!';
text['script'] = '<script>alert(\'Hello world!\');<\/script>';
text['\'中\'文'] = '<script>alert(\'Hello world!\');<\/script><script>alert(\'哈囉，世界！\');<\/script>';"#, html);
    }
}