use super::css::StyleSheet;
use serde::{Deserialize, Serialize};

#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct Item {
    contents: Vec<ItemContent>,
    layout: StyleSheet,
}

impl std::fmt::Display for Item {
    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
        write!(
            f,
            "{}",
            self.contents
                .iter()
                .map(|ic| ic.to_string())
                .collect::<Vec<String>>()
                .join("")
        )
    }
}

#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct ItemContent {
    tag: String,
    text: Option<String>,
    contents: Option<Vec<ItemContent>>,
}

impl std::fmt::Display for ItemContent {
    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
        let body = match &self.contents {
            Some(contents) => contents
                .iter()
                .map(|item| item.to_string())
                .collect::<Vec<String>>()
                .join(""),
            None => self
                .text
                .as_ref()
                .expect("Either contents or text field must be provided")
                .to_string(),
        };

        write!(f, "<{}>{}</{}>", self.tag, body, self.tag)
    }
}

#[cfg(test)]
mod test_items {
    use super::*;
    use std::collections::HashMap;

    #[test]
    fn text_item_content_to_string() {
        let item_content = ItemContent {
            tag: String::from("p"),
            text: Some(String::from("Hello")),
            contents: None,
        };

        assert_eq!(item_content.to_string(), "<p>Hello</p>")
    }

    #[test]
    fn complex_item_content_to_string() {
        let item_content = ItemContent {
            tag: String::from("p"),
            text: None,
            contents: Some(vec![
                ItemContent {
                    tag: String::from("span"),
                    text: Some(String::from("Hello ")),
                    contents: None,
                },
                ItemContent {
                    tag: String::from("b"),
                    text: Some(String::from("World")),
                    contents: None,
                },
            ]),
        };

        assert_eq!(
            item_content.to_string(),
            "<p><span>Hello </span><b>World</b></p>"
        )
    }

    #[test]
    fn item_to_string() {
        let item = Item {
            layout: StyleSheet(HashMap::new()),
            contents: vec![
                ItemContent {
                    tag: String::from("span"),
                    text: Some(String::from("Hello ")),
                    contents: None,
                },
                ItemContent {
                    tag: String::from("b"),
                    text: Some(String::from("World")),
                    contents: None,
                },
            ],
        };

        assert_eq!(item.to_string(), "<span>Hello </span><b>World</b>")
    }
}