use std::{path::Path, sync::LazyLock};

use anyhow::{Result, bail};
use futures::StreamExt;
use relm4::Sender;
use reqwest::{
    Body, Client, StatusCode,
    header::AUTHORIZATION,
    multipart::{Form, Part},
};
use tokio::fs::File;
use tokio_util::io::ReaderStream;

use crate::{Config, ProgressMessage};

static CLIENT: LazyLock<Client> = LazyLock::new(Client::new);

#[derive(Debug, Clone, serde::Deserialize)]
pub struct ZiplineFolder {
    pub id: String,
    pub name: String,
}

#[derive(Debug, serde::Deserialize)]
pub struct ZiplineUploadResponse {
    pub files: Vec<ZiplineFile>,
}

#[derive(Debug, serde::Deserialize)]
pub struct ZiplineFile {
    pub id: String,
    pub url: String,
}

#[derive(Debug, serde::Deserialize)]
pub struct ZiplineFileInfo {
    pub thumbnail: Option<ZiplineThumbnail>,
}

#[derive(Debug, serde::Deserialize)]
pub struct ZiplineThumbnail {
    pub path: String,
}

#[derive(Debug, serde::Deserialize)]
pub struct ZiplineShortUrl {
    url: String,
}

impl ZiplineFileInfo {
    pub fn thumbnail_url(&self, config: &Config) -> Option<String> {
        self.thumbnail
            .as_ref()
            .map(|t| format!("{}raw/{}", config.fixed_url(), t.path))
    }
}

async fn wrap_file(path: &Path, sender: Sender<ProgressMessage>) -> Result<Part> {
    let file_name = path
        .file_name()
        .map(|filename| filename.to_string_lossy().into_owned());

    let file = File::open(path).await?;
    let len = file.metadata().await?.len();
    sender.emit(ProgressMessage::SetTotal(len as usize));

    let stream = ReaderStream::new(file).map(move |b| {
        if let Ok(ref bytes) = b {
            sender.emit(ProgressMessage::IncProgress(bytes.len()));
        }
        b
    });

    let field = Part::stream_with_length(Body::wrap_stream(stream), len).mime_str("video/webm")?;

    Ok(if let Some(file_name) = file_name {
        field.file_name(file_name)
    } else {
        field
    })
}

pub async fn get_folders(config: &Config) -> Result<Vec<ZiplineFolder>> {
    let url = format!("{}api/user/folders?noincl=true", config.fixed_url());

    let res = CLIENT
        .get(url)
        .header(AUTHORIZATION, &config.zipline_token)
        .send()
        .await?;

    if res.status() != StatusCode::OK {
        bail!(
            "an error occurred ({}): {}",
            res.status(),
            res.text().await?
        );
    } else {
        res.json().await.map_err(Into::into)
    }
}

pub async fn upload_file(
    config: &Config,
    sender: &Sender<ProgressMessage>,
    folder: Option<&ZiplineFolder>,
    file_path: &Path,
) -> Result<ZiplineUploadResponse> {
    let url = format!("{}api/upload", config.fixed_url());

    let wrapped_file = wrap_file(file_path, sender.clone()).await?;
    let form = Form::new().part("file", wrapped_file);

    let mut req = CLIENT
        .post(url)
        .header(AUTHORIZATION, &config.zipline_token)
        .header("x-zipline-format", "name")
        .multipart(form);

    if let Some(folder) = folder {
        req = req.header("x-zipline-folder", &folder.id);
    }

    let res = req.send().await?;

    if res.status() != StatusCode::OK {
        bail!(
            "an error occurred ({}): {}",
            res.status(),
            res.text().await?
        );
    } else {
        res.json().await.map_err(Into::into)
    }
}

pub async fn recalc_thumbnails(config: &Config) -> Result<()> {
    let url = format!("{}api/server/thumbnails", config.fixed_url());

    let res = CLIENT
        .post(url)
        .header(AUTHORIZATION, &config.zipline_token)
        .json(&[("rerun", false)])
        .send()
        .await?;

    if res.status() != StatusCode::OK {
        bail!(
            "an error occurred ({}): {}",
            res.status(),
            res.text().await?
        );
    } else {
        Ok(())
    }
}

pub async fn get_file_details(config: &Config, id: &str) -> Result<ZiplineFileInfo> {
    let url = format!("{}api/user/files/{id}", config.fixed_url());

    let res = CLIENT
        .get(url)
        .header(AUTHORIZATION, &config.zipline_token)
        .send()
        .await?;

    if res.status() != StatusCode::OK {
        bail!(
            "an error occurred ({}): {}",
            res.status(),
            res.text().await?
        );
    } else {
        res.json().await.map_err(Into::into)
    }
}

pub async fn shorten_url(config: &Config, to_shorten: &str) -> Result<String> {
    let url = format!("{}api/user/urls", config.fixed_url());

    let body = serde_json::json!({
        "destination": to_shorten,
        "enabled": true,
        "vanity": null
    });

    let res = CLIENT
        .post(url)
        .json(&body)
        .header(AUTHORIZATION, &config.zipline_token)
        .send()
        .await?;

    if res.status() != StatusCode::OK {
        bail!(
            "an error occurred ({}): {}",
            res.status(),
            res.text().await?
        );
    } else {
        let out: ZiplineShortUrl = res.json().await?;

        Ok(out.url)
    }
}