use crate::parse::{EmbedRule, Platform};
use crate::Category;

pub struct Jsfiddle;

impl Platform for Jsfiddle {
    fn id(&self) -> &'static str {
        "jsfiddle"
    }

    fn name(&self) -> &'static str {
        "JSFiddle"
    }

    fn category(&self) -> Category {
        Category::Dev
    }

    fn domains(&self) -> &'static [&'static str] {
        &["jsfiddle.net"]
    }

    fn embed_rule(&self) -> Option<EmbedRule> {
        None
    }

    /// fiddle 的嵌入地址是「原路径 + `/embedded/<tabs>/`」，路径本身要原样保留。
    ///
    /// 不能用 `{id}` 模板：`/zalun/Nmud8/`（用户名 + id）与 `/6he52mnr/1/`
    /// （id + 版本）段数相同、无法靠正则区分谁是谁，而且 `{id}` 会把 `/` 转义成
    /// `%2F`。官方文档给的写法就是整段路径后面接 `/embedded/…`。
    fn parse(&self, url: &url::Url) -> Option<crate::Resolved> {
        use crate::parse::platform_resolved;
        use crate::EmbedKind;

        let path = url.path().trim_end_matches('/');
        let segments: Vec<&str> = path.trim_start_matches('/').split('/').collect();
        // 只认 fiddle 路径：`/<id>` 或 `/<user>/<id>[/<version>]`。
        // `/user/…`、`/settings` 这类是站点页面，不该被塞进 iframe。
        const RESERVED: &[&str] = &["user", "settings", "pro", "about", "docs"];
        if segments.is_empty()
            || segments.len() > 3
            || segments.iter().any(|segment| segment.is_empty())
            || segments
                .first()
                .is_some_and(|head| RESERVED.contains(&head.to_ascii_lowercase().as_str()))
        {
            return Some(platform_resolved(
                self,
                url,
                EmbedKind::Link,
                None,
                crate::Aspect::Auto,
            ));
        }
        Some(platform_resolved(
            self,
            url,
            EmbedKind::Iframe,
            Some(format!(
                "https://jsfiddle.net{path}/embedded/js,html,css,result/dark/"
            )),
            crate::Aspect::Wide,
        ))
    }
}

pub static PLATFORM: Jsfiddle = Jsfiddle;