use std::path::{PathBuf, Path};

use super::tomlconfig::TomlHtmlConfig;

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
pub struct HtmlConfig {
    destination: PathBuf,
    theme: Option<PathBuf>,
    google_analytics: Option<String>,
}

impl HtmlConfig {
    /// Creates a new `HtmlConfig` struct containing the configuration parameters for the HTML renderer.
    ///
    /// ```
    /// # use std::path::PathBuf;
    /// # use mdbook::config::HtmlConfig;
    /// #
    /// let output = PathBuf::from("root/book");
    /// let config = HtmlConfig::new(PathBuf::from("root"));
    ///
    /// assert_eq!(config.get_destination(), &output);
    /// ```
    pub fn new<T: Into<PathBuf>>(root: T) -> Self {
        HtmlConfig {
            destination: root.into().join("book"),
            theme: None,
            google_analytics: None,
        }
    }

    pub fn fill_from_tomlconfig<T: Into<PathBuf>>(&mut self, root: T, tomlconfig: TomlHtmlConfig) -> &mut Self {
        let root = root.into();

        if let Some(d) = tomlconfig.destination {
            if d.is_relative() {
                self.destination = root.join(d);
            } else {
                self.destination = d;
            }
        }

        if let Some(t) = tomlconfig.theme {
            if t.is_relative() {
                self.theme = Some(root.join(t));
            } else {
                self.theme = Some(t);
            }
        }

        if tomlconfig.google_analytics.is_some() {
            self.google_analytics = tomlconfig.google_analytics;
        }

        self
    }

    pub fn set_destination<T: Into<PathBuf>>(&mut self, root: T, destination: T) -> &mut Self {
        let d = destination.into();
        if d.is_relative() {
            self.destination = root.into().join(d);
        } else {
            self.destination = d;
        }

        self
    }

    pub fn get_destination(&self) -> &Path {
        &self.destination
    }

    // FIXME: How to get a `Option<&Path>` ?
    pub fn get_theme(&self) -> Option<&PathBuf> {
        self.theme.as_ref()
    }

    pub fn set_theme<T: Into<PathBuf>>(&mut self, root: T, theme: T) -> &mut Self {
        let d = theme.into();
        if d.is_relative() {
            self.theme = Some(root.into().join(d));
        } else {
            self.theme = Some(d);
        }

        self
    }
}