use indoc::indoc;
use serde_json;

use crate::css::scope_css;

use crate::compiler::models::{PageRoute, Project, Template};
use crate::js::minify_javascript;

impl Project {
    pub fn compile_script(&self) -> String {
        let template = indoc! { r#"
            (function() {
                if (typeof Handlebars === 'undefined') {
                    const script = document.createElement('script');
                    script.src = 'https://cdn.jsdelivr.net/npm/handlebars@latest/dist/handlebars.js';
                    document.head.appendChild(script);
                }

                const tempDefine = window.define;
                window.define = undefined;

                const script = document.createElement('script');
                script.src = 'https://cdn.jsdelivr.net/npm/handlebars@latest/dist/handlebars.js';

                script.onload = function() {
                    window.define = tempDefine; 
                    
                    {pages_script}

                    const domReadyEvent = new Event('DOMContentLoaded', {
                        bubbles: true,
                        cancelable: true,
                    });

                    document.dispatchEvent(domReadyEvent);
                    window.dispatchEvent(domReadyEvent);
                };

                document.head.appendChild(script);
            })()
        "# };
        let mut script = String::new();

        for page in &self.pages {
            let template_script = indoc! { r#"
                if (eval({page_route})) {
                    {content_script}
                }
            "# };

            let route_script = page.route.as_script();
            let content_script = page
                .content
                .iter()
                .map(|template| template.as_script())
                .collect::<Vec<String>>()
                .join("\n");

            script.push_str(
                &template_script
                    .replace(
                        "{page_route}",
                        &serde_json::to_string(&minify_javascript(&route_script)).unwrap(),
                    )
                    .replace("{content_script}", &content_script),
            );
        }

        minify_javascript(&template.replace("{pages_script}", &script))
    }
}

impl PageRoute {
    fn as_script(&self) -> String {
        match self {
            PageRoute::Regexpr(expr) => {
                let template = indoc! { r#"
                    (function() {
                        const regex = new RegExp({expr});
                        return regex.test(window.location.pathname);
                    })()
                "# };

                template.replace("{expr}", &serde_json::to_string(&expr.trim()).unwrap())
            }
            PageRoute::Static(route) => {
                let template = indoc! { r#"
                    (function() {
                        return window.location.pathname === {route};
                    })()
                "# };

                template.replace("{route}", &serde_json::to_string(&route).unwrap())
            }
            PageRoute::CustomScript(script) => script.clone(),
        }
    }
}

impl Template {
    pub fn as_script(&self) -> String {
        match self {
            Template::CustomScript { script, style } => {
                if style.is_none() || style.as_ref().unwrap().trim().is_empty() {
                    return script.clone();
                }

                let style_script = style.as_ref().map_or(String::new(), |s| {
                    format!(
                        r#"
                        const styleElement = document.createElement('style');
                        styleElement.textContent = {style};
                        document.head.appendChild(styleElement);
                    "#,
                        style = serde_json::to_string(s).unwrap()
                    )
                });

                format!("{}\n{}", style_script, script)
            }
            Template::TemplateInjector {
                template,
                replace_selector,
                scraper,
                style,
            } => {
                let scope_class = format!("template-style-{}", rand::random::<u32>());

                let style_script = if let Some(style) = style {
                    if style.trim().is_empty() {
                        String::new()
                    } else {
                        format!(
                            indoc! {r#"
                                const styleElement = document.createElement('style');
                                styleElement.textContent = {style};
                                document.head.appendChild(styleElement);
                            "# },
                            style =
                                &serde_json::to_string(&scope_css(&style, &scope_class)).unwrap()
                        )
                    }
                } else {
                    String::new()
                };

                let script_template = indoc! { r#"
                    (function() {
                        {style_script}

                        const parsedData = eval({scraper} || "(() => ({}))");
                        const template = Handlebars.compile({template});
                        const rendered = template(parsedData);
                        const targetElement = document.querySelector({replace_selector});

                        const temp = document.createElement('template');
                        temp.innerHTML = rendered;

                        const newElement = temp.content.firstElementChild;

                        targetElement.replaceWith(newElement);

                        newElement.classList.add({scope_class});
                    })();
                "# };

                script_template
                    .replace("{style_script}", &style_script)
                    .replace(
                        "{template}",
                        &serde_json::to_string(&template.trim()).unwrap(),
                    )
                    .replace(
                        "{replace_selector}",
                        &serde_json::to_string(&replace_selector).unwrap(),
                    )
                    .replace(
                        "{scope_class}",
                        &serde_json::to_string(&scope_class).unwrap(),
                    )
                    .replace(
                        "{scraper}",
                        &serde_json::to_string(&minify_javascript(
                            scraper.as_deref().unwrap_or(""),
                        ))
                        .unwrap(),
                    )
            }
        }
    }
}