use serde::{Deserialize, Serialize};

use crate::{
    directory::{DirectoryItem, DirectoryKind},
    tag::TagItem,
    utils::name_to_permalink,
    DynastyReaderRoute, DYNASTY_READER_BASE,
};

/// A configuration to get a [DirectoryList]
#[allow(missing_docs)]
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct DirectoryListConfig {
    pub name: String,
    pub kind: DirectoryKind,
    pub view_kind: Option<DirectoryListViewKind>,
    pub page_number: u64,
}

impl DirectoryListConfig {
    /// Replaces this [DirectoryListConfig] `view_kind`
    pub fn with_view_kind(self, view_kind: Option<DirectoryListViewKind>) -> DirectoryListConfig {
        DirectoryListConfig {
            name: self.name,
            kind: self.kind,
            view_kind,
            page_number: self.page_number,
        }
    }
}

impl From<DirectoryItem> for DirectoryListConfig {
    fn from(item: DirectoryItem) -> Self {
        DirectoryListConfig {
            name: item.name,
            kind: item.kind,
            view_kind: None,
            page_number: 1,
        }
    }
}

impl From<TagItem> for DirectoryListConfig {
    fn from(item: TagItem) -> Self {
        DirectoryListConfig {
            name: item.name,
            kind: item.kind,
            view_kind: None,
            page_number: 1,
        }
    }
}

impl DynastyReaderRoute for DirectoryListConfig {
    fn request_builder(
        &self,
        client: &reqwest::Client,
        url: reqwest::Url,
    ) -> reqwest::RequestBuilder {
        let builder = client.get(url).query(&[("page", self.page_number)]);

        if let Some(view_kind) = self.view_kind {
            builder.query(&[("view", view_kind.to_string())])
        } else {
            builder
        }
    }

    fn request_url(&self) -> reqwest::Url {
        let permalink = name_to_permalink(&self.name);

        DYNASTY_READER_BASE
            .join(&format!("{}/{}.json", self.kind, permalink))
            .unwrap()
    }
}

/// A Dynasty Reader directory list view mode, see view tabs at <https://dynasty-scans.com/doujins/a_certain_scientific_railgun> for references
#[allow(missing_docs)]
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum DirectoryListViewKind {
    Chapters,
    Groupings,
    OneShots,
    Pairings,
}

impl std::fmt::Display for DirectoryListViewKind {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        let s = {
            use DirectoryListViewKind::*;

            match self {
                Chapters => "chapters",
                Groupings => "groupings",
                OneShots => "one_shots",
                Pairings => "pairings",
            }
        };

        write!(f, "{s}")
    }
}

/// A wrapper around Dynasty Reader's directory list
///
/// # Example urls
///
/// - <https://dynasty-scans.com/doujins/a_certain_scientific_railgun>
/// - <https://dynasty-scans.com/tags/aaaaaangst>
#[allow(missing_docs)]
#[derive(Debug, Clone, PartialEq, Eq, Serialize)]
pub struct DirectoryList {
    pub name: String,
    pub kind: DirectoryKind,
    pub permalink: String,
    pub tags: Vec<TagItem>,
    pub status: Option<DirectoryListStatus>,
    pub cover: Option<String>,
    pub link: Option<String>,
    pub description: Option<String>,
    pub aliases: Vec<String>,
    pub items: Vec<DirectoryListItem>,
    pub chapter_items: Vec<DirectoryListChapterItem>,
    pub page_number: u64,
    pub max_page_number: u64,
}

impl<'de> Deserialize<'de> for DirectoryList {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: serde::Deserializer<'de>,
    {
        #[derive(Deserialize)]
        #[serde(untagged)]
        enum DirectoryListChapterItemWrapper {
            Chapter {
                title: String,
                permalink: String,
                released_on: String,
                tags: Vec<TagItem>,
            },
            Header {
                header: Option<String>,
            },
        }

        #[derive(Deserialize)]
        #[serde(untagged)]
        enum TagWrapper {
            Default(TagItem),
            Status(DirectoryListStatus),
        }

        #[derive(Deserialize)]
        struct DirectoryListWrapper {
            name: String,
            #[serde(rename(deserialize = "type"))]
            kind: DirectoryKind,
            permalink: String,
            tags: Vec<TagWrapper>,
            #[serde(deserialize_with = "crate::utils::join_path_with_dynasty_reader_base")]
            cover: String,
            link: Option<String>,
            description: Option<String>,
            aliases: Vec<String>,
            #[serde(default)]
            taggables: Vec<DirectoryListItem>,
            #[serde(default)]
            taggings: Vec<DirectoryListChapterItemWrapper>,
            current_page: Option<u64>,
            total_pages: Option<u64>,
        }

        let wrapper: DirectoryListWrapper = Deserialize::deserialize(deserializer)?;

        let DirectoryListWrapper {
            name,
            kind,
            permalink,
            tags,
            cover,
            link,
            description,
            aliases,
            taggables: items,
            taggings: chapter_items,
            current_page: page_number,
            total_pages: max_page_number,
        } = wrapper;

        let page_number = page_number.unwrap_or(1);
        let max_page_number = max_page_number.unwrap_or(1);
        let cover = if cover.is_empty() { None } else { Some(cover) };
        let status = tags.iter().find_map(|tag| match tag {
            TagWrapper::Status(s) => Some(s.clone()),
            _ => None,
        });
        let tags = tags
            .iter()
            .filter_map(|tag| match tag {
                TagWrapper::Default(s) => Some(s.clone()),
                _ => None,
            })
            .collect();
        let chapter_items = {
            let mut current_header: Option<String> = None;
            chapter_items.into_iter().fold(vec![], |mut current, item| {
                use DirectoryListChapterItemWrapper::*;

                match item {
                    Chapter {
                        title,
                        permalink,
                        released_on,
                        tags,
                    } => current.push(DirectoryListChapterItem {
                        header: current_header.clone(),
                        permalink,
                        released_on,
                        title,
                        tags,
                    }),
                    Header { header } => current_header = header,
                }

                current
            })
        };

        Ok(DirectoryList {
            name,
            kind,
            permalink,
            tags,
            status,
            cover,
            link,
            description,
            aliases,
            items,
            chapter_items,
            page_number,
            max_page_number,
        })
    }
}

/// A Dynasty Reader's directory list status
#[allow(missing_docs)]
#[derive(Debug, Clone, PartialEq, Eq, Serialize)]
pub enum DirectoryListStatus {
    Abandoned,
    Cancelled,
    Completed,
    Licensed,
    Ongoing,
    Unknown,
}

impl<'de> Deserialize<'de> for DirectoryListStatus {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: serde::Deserializer<'de>,
    {
        #[derive(Deserialize)]
        struct DirectoryListStatusWrapper<'a> {
            name: &'a str,
        }

        let wrapper: DirectoryListStatusWrapper = Deserialize::deserialize(deserializer)?;

        Ok({
            use DirectoryListStatus::*;

            match wrapper.name {
                "Abandoned" => Abandoned,
                "Cancelled" => Cancelled,
                "Completed" => Completed,
                "Licensed" => Licensed,
                "Ongoing" => Ongoing,
                _ => Unknown,
            }
        })
    }
}

/// A Dynasty Reader's directory list item
#[allow(missing_docs)]
#[derive(Debug, Clone, PartialEq, Eq, Serialize)]
pub struct DirectoryListItem {
    pub name: String,
    pub kind: DirectoryKind,
    pub permalink: String,
    pub cover: Option<String>,
}

impl<'de> Deserialize<'de> for DirectoryListItem {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: serde::Deserializer<'de>,
    {
        #[derive(Deserialize)]
        struct DirectoryListItemWrapper {
            name: String,
            #[serde(rename(deserialize = "type"))]
            kind: DirectoryKind,
            permalink: String,
            #[serde(deserialize_with = "crate::utils::join_path_with_dynasty_reader_base")]
            cover: String,
        }

        let wrapper: DirectoryListItemWrapper = Deserialize::deserialize(deserializer)?;

        let DirectoryListItemWrapper {
            name,
            kind,
            permalink,
            cover,
        } = wrapper;

        let cover = if cover.is_empty() { None } else { Some(cover) };

        Ok(DirectoryListItem {
            name,
            kind,
            permalink,
            cover,
        })
    }
}

/// A Dynasty Reader's directory list chapter item
#[allow(missing_docs)]
#[derive(Debug, Clone, PartialEq, Eq, Deserialize, Serialize)]
pub struct DirectoryListChapterItem {
    pub title: String,
    pub header: Option<String>,
    pub permalink: String,
    pub released_on: String,
    pub tags: Vec<TagItem>,
}

#[cfg(test)]
mod tests {
    use anyhow::Result;

    use crate::test_utils::tryhard_configs;

    use super::*;

    fn create_config(
        c: (
            DirectoryKind,
            &str,
            impl Into<Option<DirectoryListViewKind>>,
        ),
    ) -> DirectoryListConfig {
        DirectoryListConfig {
            name: c.1.to_string(),
            kind: c.0,
            page_number: 1,
            view_kind: c.2.into(),
        }
    }

    fn create_config_with_superset_view_kind(c: (DirectoryKind, &str)) -> Vec<DirectoryListConfig> {
        [
            DirectoryListViewKind::Chapters,
            DirectoryListViewKind::Groupings,
            DirectoryListViewKind::OneShots,
            DirectoryListViewKind::Pairings,
        ]
        .map(|view_kind| create_config((c.0, c.1, view_kind)))
        .to_vec()
    }

    #[tokio::test]
    #[ignore = "requires internet"]
    async fn response_structure() -> Result<()> {
        let configs = [
            (DirectoryKind::Doujin, "Bloom Into You"),
            (DirectoryKind::Pairing, "Homura x Madoka"),
            (DirectoryKind::Tag, "Aaaaaangst"),
        ]
        .map(create_config_with_superset_view_kind)
        .into_iter()
        .flatten()
        .collect::<Vec<_>>();

        tryhard_configs(configs, |client, config| client.directory_list(config)).await?;

        Ok(())
    }

    #[tokio::test]
    #[ignore = "requires internet"]
    async fn viewless_response_structure() -> Result<()> {
        let configs = [
            (DirectoryKind::Anthology, "And Then, To You", None),
            (DirectoryKind::Author, "Nakatani Nio", None),
            (DirectoryKind::Issue, "Aya Yuri Vol 11", None),
            (DirectoryKind::Scanlator, "/u/ Scanlations", None),
            (
                DirectoryKind::Series,
                "Arknights Official Comic Anthology",
                None,
            ),
        ]
        .map(create_config);

        tryhard_configs(configs, |client, config| client.directory_list(config)).await?;

        Ok(())
    }
}