use log::{debug, trace};

use crate::{
    file::{self, FileTrait},
    sharry::{self, AliasID, FileID, ShareID, Uri},
};

fn find_cause(
    uri: &Uri,
    alias_id: &AliasID,
    share_id: Option<&ShareID>,
    file_id: Option<&FileID>,
) -> impl FnOnce(ureq::Error) -> crate::Error {
    move |error| match error {
        ureq::Error::StatusCode(403) => {
            trace!("HTTP Error 403: Alias not found!");

            crate::Error::InvalidParameter(crate::Parameter::AliasID(alias_id.to_owned()))
        }
        ureq::Error::StatusCode(404) => {
            trace!("HTTP Error 404: Share and/or file may have been deleted!");

            if let Some(file_id) = file_id {
                crate::Error::InvalidParameter(crate::Parameter::FileID(file_id.to_owned()))
            } else if let Some(share_id) = share_id {
                crate::Error::InvalidParameter(crate::Parameter::ShareID(share_id.to_owned()))
            } else {
                crate::Error::InvalidParameter(crate::Parameter::Uri(uri.to_string()))
            }
        }
        ureq::Error::Io(error) => {
            trace!("std::io::Error {error:?}");

            if let Some(msg) = error.get_ref().map(ToString::to_string) {
                if msg.starts_with("failed to lookup address information") {
                    crate::Error::InvalidParameter(crate::Parameter::Uri(uri.to_string()))
                } else {
                    error.into()
                }
            } else {
                error.into()
            }
        }
        error => crate::Error::Unknown(error.to_string()),
    }
}

impl sharry::Client for ureq::Agent {
    fn share_create(
        &self,
        uri: &Uri,
        alias_id: &AliasID,
        data: sharry::NewShareRequest,
    ) -> crate::Result<ShareID> {
        let res = {
            let endpoint = uri.share_create();

            let mut res = self
                .post(&endpoint)
                .header("Sharry-Alias", alias_id.as_ref())
                .send_json(data)
                .map_err(find_cause(uri, alias_id, None, None))?;

            trace!("{endpoint:?} response: {res:?}");
            crate::Error::res_status_check(res.status(), ureq::http::StatusCode::OK)?;

            res.body_mut()
                .read_json::<sharry::NewShareResponse>()
                .map_err(crate::Error::response)?
        };

        debug!("{res:?}");

        if res.success && (res.message == "Share created.") {
            trace!("new share id: {:?}", res.id);

            Ok(res.id.into())
        } else {
            Err(crate::Error::response(format!("{res:?}")))
        }
    }

    fn share_notify(&self, uri: &Uri, alias_id: &AliasID, share_id: &ShareID) -> crate::Result<()> {
        let res = {
            let endpoint = uri.share_notify(share_id);

            let mut res = self
                .post(&endpoint)
                .header("Sharry-Alias", alias_id.as_ref())
                .send_empty()
                .map_err(find_cause(uri, alias_id, Some(share_id), None))?;

            trace!("{endpoint:?} response: {res:?}");
            crate::Error::res_status_check(res.status(), ureq::http::StatusCode::OK)?;

            res.body_mut()
                .read_json::<sharry::NotifyShareResponse>()
                .map_err(crate::Error::response)?
        };

        debug!("{res:?}");

        Ok(())
    }

    fn file_create(
        &self,
        uri: &Uri,
        alias_id: &AliasID,
        share_id: &ShareID,
        file: &file::Checked,
    ) -> crate::Result<FileID> {
        let res = {
            let endpoint = uri.file_create(share_id);

            let res = self
                .post(&endpoint)
                .header("Sharry-Alias", alias_id.as_ref())
                .header("Sharry-File-Name", file.get_name())
                .header("Upload-Length", file.get_size())
                .send_empty()
                .map_err(find_cause(uri, alias_id, Some(share_id), None))?;

            trace!("{endpoint:?} response: {res:?}");
            crate::Error::res_status_check(res.status(), ureq::http::StatusCode::CREATED)?;
            res
        };

        let location = (res.headers().get("Location"))
            .ok_or_else(|| crate::Error::response("Location header not found"))?
            .to_str()
            .map_err(crate::Error::response)?
            .to_string();

        FileID::try_from(location)
    }

    fn file_patch(
        &self,
        uri: &Uri,
        alias_id: &AliasID,
        share_id: &ShareID,
        chunk: &file::Chunk,
    ) -> crate::Result<()> {
        let res = {
            let endpoint = uri.file_patch(share_id, chunk.get_file_id());

            let res = self
                .patch(&endpoint)
                .header("Sharry-Alias", alias_id.as_ref())
                .header("Upload-Offset", chunk.get_offset())
                .send(chunk.get_data())
                .map_err(find_cause(
                    uri,
                    alias_id,
                    Some(share_id),
                    Some(chunk.get_file_id()),
                ))?;

            trace!("{endpoint:?} response: {res:?}");
            crate::Error::res_status_check(res.status(), ureq::http::StatusCode::NO_CONTENT)?;
            res
        };

        let res_offset = (res.headers().get("Upload-Offset"))
            .ok_or_else(|| crate::Error::response("Upload-Offset header not found"))?
            .to_str()
            .map_err(crate::Error::response)?
            .parse::<u64>()
            .map_err(crate::Error::response)?;

        if chunk.get_behind() == res_offset {
            Ok(())
        } else {
            Err(crate::Error::response(format!(
                "Unexpected Upload-Offset: {} (expected {})",
                res_offset,
                chunk.get_behind()
            )))
        }
    }
}