use std::{error::Error, io};

use log::debug;

use super::{
    api::{NewShareRequest, NewShareResponse, NotifyShareResponse, Uri},
    file::{FileChecked, FileUploading, SharryFile},
};

pub trait Client {
    fn sharry_share_create(
        &self,
        uri: &Uri,
        alias_id: &str,
        data: NewShareRequest,
    ) -> Result<String, ClientError>;

    fn sharry_share_notify(
        &self,
        uri: &Uri,
        alias_id: &str,
        share_id: &str,
    ) -> Result<(), ClientError>;

    fn sharry_file_create(
        &self,
        uri: &Uri,
        alias_id: &str,
        share_id: &str,
        file: FileChecked,
    ) -> Result<FileUploading, ClientError>;

    // fn sharry_file_patch(&self);
}

#[derive(Debug, thiserror::Error)]
pub enum ClientError {
    #[error("file I/O error: {0}")]
    FileIO(#[from] io::Error),

    #[error("network request failed: {0}")]
    Request(String),

    #[error("response parsing failed: {0}")]
    ResponseParsing(String),

    #[error("unexpected response status: {actual} (expected {expected})")]
    ResponseStatus { actual: u16, expected: u16 },

    #[error("unexpected response content: {0}")]
    ResponseContent(String),
    //
    // #[error("could not parse offset header")]
    // ResponseOffset,
}

impl Client for ureq::Agent {
    fn sharry_share_create(
        &self,
        uri: &Uri,
        alias_id: &str,
        data: NewShareRequest,
    ) -> Result<String, ClientError> {
        let res = {
            let endpoint = uri.get_endpoint("alias/upload/new");

            self.post(endpoint)
                .header("Sharry-Alias", alias_id)
                .send_json(data)
                .map_err(|e| ClientError::Request(e.to_string()))?
                .body_mut()
                .read_json::<NewShareResponse>()
                .map_err(|e| ClientError::ResponseParsing(e.to_string()))?
        };

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

        if res.success && (res.message == "Share created.") {
            Ok(res.id)
        } else {
            Err(ClientError::ResponseContent(format!("{res:?}")))
        }
    }

    fn sharry_share_notify(
        &self,
        uri: &Uri,
        alias_id: &str,
        share_id: &str,
    ) -> Result<(), ClientError> {
        let res = {
            let endpoint = uri.get_endpoint(format!("alias/mail/notify/{}", share_id));

            self.post(endpoint)
                .header("Sharry-Alias", alias_id)
                .send_empty()
                .map_err(|e| ClientError::Request(e.to_string()))?
                .body_mut()
                .read_json::<NotifyShareResponse>()
                .map_err(|e| ClientError::ResponseParsing(e.to_string()))?
        };

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

        Ok(())
    }

    fn sharry_file_create(
        &self,
        uri: &Uri,
        alias_id: &str,
        share_id: &str,
        file: FileChecked,
    ) -> Result<FileUploading, ClientError> {
        let size = file.get_size();

        let res = {
            let endpoint = uri.get_endpoint(format!("alias/upload/{}/files/tus", share_id));

            self.post(endpoint)
                .header("Sharry-Alias", alias_id)
                .header("Sharry-File-Name", file.get_name())
                .header("Upload-Length", size)
                .send_empty()
                .map_err(|e| ClientError::Request(e.to_string()))?
        };

        if res.status() != ureq::http::StatusCode::CREATED {
            return Err(ClientError::ResponseStatus {
                actual: res.status().as_u16(),
                expected: ureq::http::StatusCode::CREATED.as_u16(),
            });
        }

        let location = (res.headers().get("Location"))
            .ok_or_else(|| ClientError::ResponseParsing("Location header not found".to_owned()))?
            .to_str()
            .map_err(|_| ClientError::ResponseParsing("Location header invalid".to_owned()))?
            .to_string();

        debug!("patch uri: {location}");

        Ok(FileUploading::new(file.into_path(), size, location))
    }
}