use crate::{tag::Tag, ProjectInfo};

pub fn generate_html_for_tags(
    tags: Vec<Tag>,
    project_info: &ProjectInfo,
    crate_info: Option<ProjectInfo>, // valid if the file belongs to a crate dependency
    source: &str,
    file_name: String,
    relative_data_path: &str,
    relative_root_dir: &str,
    relative_file_path: &str,
) -> String {
    let mut out = create_header(
        file_name,
        relative_data_path,
        relative_root_dir,
        relative_file_path,
        project_info,
        crate_info,
    );

    // reserve some extra space
    out.reserve(out.len() + (2 * source.len()));

    out += "<div id='content'>\n";
    out += "<table class='code'>\n";
    out += "<tbody>\n";

    out += "<tr>\n";
    let mut linenum = 1;
    out += "<th>1</th>";
    out += "<td>";

    let mut last_found_tag_idx = 0;
    let mut current_tag_end = usize::max_value();
    let mut stack: Vec<&Tag> = Vec::new();
    // manually index because our tags store byte offset as start/end
    // and chars.enumerate() will iterate over utf8
    let mut i = 0;
    for ch in source.chars() {
        if i == current_tag_end {
            while let Some(t) = stack.pop() {
                out = out + &t.close();
            }
            current_tag_end = usize::max_value();
        }

        // if we already have a tag, then no need to search
        if current_tag_end == usize::max_value() {
            for (idx, tag) in tags.iter().skip(last_found_tag_idx).enumerate() {
                if tag.start as usize == i {
                    out = out + &tag.open();
                    current_tag_end = tag.end as usize;
                    stack.push(tag);
                    last_found_tag_idx = idx + last_found_tag_idx + 1;
                    break;
                } else if tag.start as usize > i {
                    // tags are sorted, so if its greater than 'i', we didn't find anything
                    break;
                }
            }
        }

        if ch == '\n' {
            let stack_copy = stack.clone();
            while let Some(t) = stack.pop() {
                out = format!("{}{}", out, t.close())
            }

            out += "</td></tr>\n";
            linenum += 1;

            let linenumstr = linenum.to_string();
            out += "<tr><th id=\"";
            out = out + &linenumstr;
            out += "\">";
            out = out + &linenumstr;
            out += "</th><td>";

            // reopen tags for next line
            for tag in &stack_copy {
                out = out + &tag.open();
            }
            stack = stack_copy;
        } else if ch == '<' {
            out.push_str("&lt;");
        } else if ch == '>' {
            out.push_str("&gt;");
        } else if ch == '&' {
            out.push_str("&amp;");
        } else {
            out.push(ch)
        }
        i += ch.len_utf8();
    }
    out += "</td></tr>\n</tbody>\n</table>\n";

    let time = std::time::SystemTime::now();
    let datetime: chrono::DateTime<chrono::offset::Utc> = time.into();
    let datetime = datetime.format("%Y-%b-%d");

    // BEGIN footer
    let footer = format!(
        "Generated on <em>{}</em> from project {} revision <em>{}</em>",
        datetime, project_info.name, project_info.version
    ); // TODO
    out += "<div id='footercontainer'><div id='footer'>\n";
    out += &footer;
    out += "<br />Powered by <a href='https://codebrowser.dev'>Code Browser</a> 2.1\n<br/>Generator usage only permitted with license.";
    out += "</div></div>\n";
    // END footer

    out += "</div>\n</body>\n</html>\n";
    out
}

pub fn create_header(
    file_name: String,
    data_path: &str,
    root_path: &str,
    file_path: &str,
    project_info: &ProjectInfo,
    crate_info: Option<ProjectInfo>,
) -> String {
    let (project_name, mut version): (&str, &str) = if let Some(p) = &crate_info {
        (&p.name, &p.version)
    } else {
        (&project_info.name, &project_info.version)
    };

    if version.len() > 7 {
        version = &version[..7]; // limit the length to 7
    }

    format!(
        r#"<!DOCTYPE html>
<html lang="en">
  <head>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Source code of {file_name} {project_name} {version} on KDAB Codebrowser">
    <title>{file_name} source code [{file_path}] - Codebrowser </title>
    <link rel="stylesheet" href="{data_path}/staticpages.css"/>
    <link rel="stylesheet" href="{data_path}/qtcreator.css" title="QtCreator">
    <link rel="alternate stylesheet" href="{data_path}/kdevelop.css" title="KDevelop"/>
    <link rel="alternate stylesheet" href="{data_path}/solarized.css" title="Solarized"/>
    <script type="text/javascript" src="{data_path}/jquery/jquery.min.js"></script>
    <script type="text/javascript" src="{data_path}/jquery/jquery-ui.min.js"></script>
    <script>var file = '{file_path}'; var root_path = '{root_path}'; var data_path = '{data_path}'; var ecma_script_api_version = 2;</script>
    <script src="{data_path}/codebrowser.js"></script>
  </head>
<body>
  <div id='header'>
    <div id='rowOne' class='flexStyle'>
      <div id='logo' class='marginAuto'>
        <a class='logo' href='/'><img src="{data_path}/codebrowserLogo.png" alt="Codebrowser logo"/></a>
      </div>
      <div id='about' class='marginAuto'>
        <a href='/about.html'>About</a>
      </div>
      <div id='contact' class='marginAuto'>
        <a href='mailto:info@kdab.com'>Contact</a>
      </div>
    </div>
    <div id='rowTwo' class='flexStyle flexGrow'>
      <div id='searchbox' class='marginAuto flexGrow'>
        <input id='searchline' placeholder='Search for a file or function' type='text'/>
      </div>
      <div id='style'>
        <div id='stylename'></div>
        <div class='custom-select'>
          <select id='change_style' class='opt_style'>
            <option value='qtcreator'>QtCreator</option>
            <option value='kdevelop'>KDevelop</option>
            <option value='solarized'>Solarized</option>
          </select>
        </div>
      </div>
    </div>
  </div>
"#
    )
}