use std::{
    cmp::Ordering,
    fs::{self, Permissions},
    fmt,
    os::unix::fs::PermissionsExt,
    path,
    slice::Iter,
    time::{Duration},
};
use bytes::Bytes;
use bytesize::ByteSize;
use std::process::Command;
use rand::distr::{Alphanumeric, SampleString};
use thiserror::Error;
use axum::{
    body::Body,
    extract::{Path, Json, State, Multipart},
    http::{
        StatusCode,
        header::{HeaderMap, CONTENT_TYPE, AUTHORIZATION},
        Uri,
    },
    response::{IntoResponse, Response, Redirect, Html},
    middleware::Next,
};
use axum_auth::AuthBearer;
use axum_extra::extract::CookieJar;
use reqwest::{
    Client, Method, Request, RequestBuilder, Url
};
use serde::{Serialize, Deserialize};
use serde_json::Value;
use tower_http::services::ServeFile;

use crate::{query, ServerState};

static FOLDER_PERM: u32 = 0o750;
static FILE_PERM: u32 = 0o640;

#[derive(Debug, Clone, Copy)]
#[repr(u8)]
pub enum RepoFeature {
    Docs = 0,
    Builds = 1,
    Nightly = 2,
    PreProd = 3,
}

type FeatureList = Vec<String>;

impl RepoFeature {
    pub fn iter() -> Iter<'static, RepoFeature> {
        static REPOFEATURE: [RepoFeature; 4] = [RepoFeature::Docs, RepoFeature::Builds, RepoFeature::Nightly, RepoFeature::PreProd];
        REPOFEATURE.iter()
    }
}

impl fmt::Display for RepoFeature {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        fmt::Debug::fmt(self, f)
    }
}

impl From<RepoFeature> for String {
    fn from(value: RepoFeature) -> Self {
        value.to_string().to_lowercase()
    }
}

impl TryFrom<&str> for RepoFeature {
    type Error = ApiError;

    fn try_from(value: &str) -> Result<Self> {
        for feature in RepoFeature::iter() {
            if feature.to_string().to_lowercase() == value.to_lowercase() {
                return Ok(*feature);
            }
        }
        Err(ApiError::InvalidFeature { feature: value.to_owned() })
    }
}

#[derive(Clone, Copy, Debug)]
#[repr(u16)]
pub enum ErrorCode {
    InvalidToken = 0,   // Invalid OAuth token.
    External = 1,       // Error originates from an external location/server.
    Filesystem = 2,     // Error originates from filesystem operation.
    Sql = 3,            // Error originates from SQL.
    BadRequest = 4,     // Error originates from client request.
}

#[derive(Clone, Copy, Debug, Error)]
pub struct CustomError(&'static str, ErrorCode);
impl fmt::Display for CustomError {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{}, {:?}", self.0, self.1)
    }
}

#[derive(Debug, Error)]
pub enum ApiError {
    #[error("Request error: {0}")]
    RequestError(#[from] reqwest::Error),
    #[error("SQL error: {0}")]
    SQLError(#[from] sqlite::Error),
    #[error("Filesystem error: {0}")]
    IOError(#[from] std::io::Error),
    #[error("Multipart extract error: {0}")]
    MultipartError(#[from] axum::extract::multipart::MultipartError),
    #[error("Unexpected input in JSON: {msg}")]
    InvalidJson { msg: String },
    #[error("No such feature '{feature}' exists")]
    InvalidFeature { feature: String },
    #[error("The feature '{feature}' is not enabled for this repository")]
    DisabledFeature { feature: String },
    #[error("The current user is not an owner of '{repo}'")]
    Unauthorized { repo: String },
    #[error("A token was not provided or is malformed")]
    Tokenless,
    #[error("{0}")]
    CustomError(#[from] CustomError)
}

static ERR_GITEA_CONTENT_TYPE: CustomError = CustomError("Content-Type in Gitea response invalid", ErrorCode::External);
static ERR_MISSING_PARENT: CustomError = CustomError("Could not find parent in repo directory. Should be impossible...", ErrorCode::Filesystem);
static ERR_UNTAR: CustomError = CustomError("Failed to complete untar", ErrorCode::Filesystem);
static ERR_OS_STR_UTF: CustomError = CustomError("OsString failed to parse into UTF-8", ErrorCode::Filesystem);
static ERR_FILE_CALL_UTF: CustomError = CustomError("file command output failed to parse into UTF-8", ErrorCode::Filesystem);
static ERR_FILE_CALL_UNEXPECTED: CustomError = CustomError("file command output had unexpected output", ErrorCode::Filesystem);
pub static ERR_CONTENT_FOLDER_RENDER: CustomError = CustomError("Unable to process 'ContentFolder' template", ErrorCode::Filesystem);
static ERR_IMPOSSIBLE_ENTRY: CustomError = CustomError("Entry is neither file, directory or symlink", ErrorCode::Filesystem);

#[derive(Serialize)]
pub struct ErrorResponse {
    status: u16,
    code: u16,
    message: String,
}

pub type Result<T, E = ApiError> = core::result::Result<T, E>;
impl IntoResponse for ApiError {
    fn into_response(self) -> Response<Body> {
        let (status, code) = match self {
            ApiError::RequestError(ref err) => {
                let status = err.status().unwrap_or(StatusCode::INTERNAL_SERVER_ERROR);
                let action = match status {
                    StatusCode::FORBIDDEN => ErrorCode::InvalidToken,
                    _ => ErrorCode::External
                };
                (status, action)
            },
            ApiError::SQLError(_) => (StatusCode::INTERNAL_SERVER_ERROR, ErrorCode::Sql),
            ApiError::IOError(_) => (StatusCode::INTERNAL_SERVER_ERROR, ErrorCode::Filesystem),
            ApiError::MultipartError(_) => (StatusCode::INTERNAL_SERVER_ERROR, ErrorCode::BadRequest),
            ApiError::InvalidJson{..} => (StatusCode::INTERNAL_SERVER_ERROR, ErrorCode::External),
            ApiError::InvalidFeature{..} => (StatusCode::BAD_REQUEST, ErrorCode::BadRequest),
            ApiError::DisabledFeature{..} => (StatusCode::NOT_FOUND, ErrorCode::BadRequest),
            ApiError::Unauthorized{..} => (StatusCode::FORBIDDEN, ErrorCode::BadRequest),
            ApiError::Tokenless => (StatusCode::FORBIDDEN, ErrorCode::InvalidToken),
            ApiError::CustomError(ref e) => (StatusCode::INTERNAL_SERVER_ERROR, e.1),
        };
        (status, Json(ErrorResponse{
            status: u16::from(status),
            code: code as u16,
            message: self.to_string(),
        })).into_response()
    }
}

fn as_feature_list(value: u64) -> FeatureList {
    let mut v: Vec<String> = Vec::new();
    for feature in RepoFeature::iter() {
        let feat_num = 1 << (*feature as u64);
        if (value & feat_num) == feat_num {
            v.push(Into::<String>::into(*feature).to_owned());
        }
    }
    v
}

async fn gitea_api<T, U>(url: &str, method: Method, payload: &T, token: &str) -> Result<U> where
    T: Serialize + ?Sized,
    U: serde::de::DeserializeOwned + Default
{
    // Make request to Gitea.
    let res = RequestBuilder::from_parts(Client::new(), Request::new(method, Url::parse(url).unwrap()))
        .header("User-Agent", "TestBot")
        .header("Authorization", format!("token {token}"))
        .json(payload)
        .send()
        .await?;
    res.error_for_status_ref()?; // Return with error if Gitea request has error.

    let mut content_type = "".to_owned();
    if res.headers().contains_key(CONTENT_TYPE) {
        content_type = res.headers().get(CONTENT_TYPE)
                                        .unwrap()
                                        .to_str()
                                        .map_err(|_| ERR_GITEA_CONTENT_TYPE )?
                                        .to_owned();
    }

    if content_type.contains("application/json") {
        Ok(res.json::<U>().await?)
    } else {
        Ok(U::default())
    }
}

async fn authorize(host: &str, token: &str, repo: &str, kind: &str) -> Result<Json<Value>> {
    // Use repos API call to check admin permission. Return the repo JSON as
    // well in case it needs to be used later.
    let url = format!("{host}/api/v1/repos/{repo}");
    let data = Empty{};

    let json: Value = gitea_api(&url, Method::GET, &data, token).await?;

    // If 'kind' permission is not true, return error.
    json.get("permissions")
        .ok_or(ApiError::InvalidJson{ msg: "Couldn't find 'permissions' key.".to_owned() })?
        .get(kind)
        .ok_or(ApiError::InvalidJson{ msg: format!("Couldn't find '{kind}' key.") })?
        .as_bool()
        .ok_or(ApiError::InvalidJson{ msg: format!("Value in '{kind}' is not bool.") })?
        .then_some(0)
        .ok_or(ApiError::Unauthorized{ repo: repo.to_owned() })?;

    Ok(Json(json))
}

#[derive(Serialize, Deserialize, Default)]
pub struct Empty();

#[derive(Deserialize)]
pub struct TokenAuth {
    code: String /* Could be refresh token. */
}

#[derive(Serialize)]
pub struct TokenRequest {
    client_id: String,
    client_secret: String,
    code: String,
    grant_type: String,
    redirect_uri: String
}

#[derive(Deserialize, Serialize, Default)]
pub struct TokenResponse {
    access_token: String,
    token_type: String,
    expires_in: i32,
    refresh_token: String
}

pub async fn token(State(state): State<ServerState<'_>>,
                   Json(payload): Json<TokenAuth>) -> Result<Json<TokenResponse>> {

    let token_endpoint = format!("{}/login/oauth/access_token", state.config.gitea_host);
    let redirect_uri = "http://127.0.0.1:3000";

    let data = TokenRequest {
        client_id: state.config.client_id,
        client_secret: state.config.client_secret,
        code: payload.code,
        grant_type: "authorization_code".to_owned(),
        redirect_uri: redirect_uri.to_owned()
    };

    Ok(Json(gitea_api(&token_endpoint, Method::POST, &data, "").await?))
}

#[derive(Serialize)]
pub struct RefreshTokenRequest {
    client_id: String,
    client_secret: String,
    refresh_token: String,
    grant_type: String,
}

pub async fn refresh_token(State(state): State<ServerState<'_>>,
                           Json(payload): Json<TokenAuth>) -> Result<Json<TokenResponse>>{

    let token_endpoint = format!("{}/login/oauth/access_token", state.config.gitea_host);

    let data = RefreshTokenRequest {
        client_id: state.config.client_id,
        client_secret: state.config.client_secret,
        refresh_token: payload.code,
        grant_type: "refresh_token".to_owned(),
    };

    Ok(Json(gitea_api(&token_endpoint, Method::POST, &data, "").await?))
}

#[derive(Serialize)]
pub struct RepoResponse {
    description: String,
    exists: bool,
    features: FeatureList,
}

pub async fn get_repo(State(state): State<ServerState<'_>>,
                      Path((owner, repo)): Path<(String, String)>,
                      AuthBearer(token): AuthBearer) -> Result<Json<RepoResponse>> {
    let repo = format!("{owner}/{repo}");
    // Pull repository information from Gitea.
    let json = authorize(&state.config.gitea_host, &token, &repo, "admin").await?;

    let description = json.get("description")
                          .ok_or(ApiError::InvalidJson{ msg: "Couldn't find 'description' key.".to_owned() })?
                          .as_str()
                          .ok_or(ApiError::InvalidJson{ msg: "Value in 'description' is not String.".to_owned() })?
                          .to_owned();

    // Check if entry exists and return features.
    let mut features = state.sql.prepare(query::GET_REPO)?
                                .iter()
                                .bind((1, repo.as_str()))?
                                .map(|row| -> Result<FeatureList> {
                                    Ok(as_feature_list(row?.read::<i64, _>("features") as u64))
                                })
                                .collect::<Result<Vec<FeatureList>>>()?;

    if features.len() == 1 {
        Ok(Json(RepoResponse { description, exists: true, features: features.remove(0) }))
    } else {
        Ok(Json(RepoResponse { description, exists: false, features: vec!() }))
    }
}

#[derive(Serialize)]
pub struct GiteaSetSecret {
    data: String,
}

pub async fn create_repo(State(state): State<ServerState<'_>>,
                         Path((owner, repo)): Path<(String, String)>,
                         AuthBearer(token): AuthBearer,
                         ) -> Result<()> {
    let repo = format!("{owner}/{repo}").to_lowercase(); // Repos are case-insensitive.
    let _ = authorize(&state.config.gitea_host, &token, &repo, "admin").await?;

    // Create secret and insert new repository into database.
    let secret = Alphanumeric.sample_string(&mut rand::rng(), 48);
    let _: i32 = state.sql.prepare(crate::query::CREATE_REPO)?
                     .iter()
                     .bind_iter::<_, (_, sqlite::Value)>([
                         (1, repo.clone().into()),
                         (2, 0.into()),
                         (3, secret.clone().into()),
                     ])?
                    .map(|_| 0)
                    .sum(); // Evaluate statement.

    // Make associated folder.
    let owner_dir = path::Path::new(&state.config.upload_path).join(&owner);
    let repo_dir = path::Path::new(&state.config.upload_path).join(&repo);
    if !fs::exists(&owner_dir)? {
        fs::create_dir(&owner_dir)?;
        fs::set_permissions(owner_dir, Permissions::from_mode(FOLDER_PERM))?;
    }

    if !fs::exists(&repo_dir)? {
        fs::create_dir(&repo_dir)?;
        fs::set_permissions(repo_dir, Permissions::from_mode(FOLDER_PERM))?;
    }

    // Add secret to Gitea secrets.
    let secret_url = format!("{}/api/v1/repos/{}/actions/secrets/PACK_REPO_SECRET", &state.config.gitea_host, &repo);
    let data = GiteaSetSecret { data: secret };
    let _: Empty = gitea_api(secret_url.as_str(), Method::PUT, &data, &token).await?;

    Ok(())

}
pub async fn delete_repo(State(state): State<ServerState<'_>>,
                         Path((owner, repo)): Path<(String, String)>,
                         AuthBearer(token): AuthBearer,
                         ) -> Result<()> {
    let repo = format!("{owner}/{repo}").to_lowercase(); // Repos are case-insensitive.
    let _ = authorize(&state.config.gitea_host, &token, &repo, "admin").await?;

    let _: i32 = state.sql.prepare(crate::query::DELETE_REPO)?
                     .iter()
                     .bind((1, repo.as_str()))?
                     .map(|_| 0)
                     .sum(); // Evaluate statement.

    // Remove entire directory and its parent if its empty.
    let dir = path::Path::new(&state.config.upload_path).join(&repo);
    let parent = dir.as_path()
                    .parent()
                    .ok_or(ERR_MISSING_PARENT)?;

    fs::remove_dir_all(&dir)?;
    if fs::read_dir(parent)?.next().is_none() {
        fs::remove_dir(parent)?;
    }

    // Remove secret from Gitea.
    let secret_url = format!("{}/api/v1/repos/{}/actions/secrets/PACK_REPO_SECRET", &state.config.gitea_host, &repo);
    let data = Empty{};
    let _: Empty = gitea_api(secret_url.as_str(), Method::DELETE, &data, &token).await?;
    Ok(())
}

#[derive(Deserialize)]
pub struct PatchRepoRequest {
    secret: bool,
    feature: String,
}

async fn update_secret(state: &ServerState<'_>, repo: &str, token: &str) -> Result<()> {
    let secret = Alphanumeric.sample_string(&mut rand::rng(), 48);
    let _: i32 = state.sql.prepare(crate::query::UPDATE_REPO_SECRET)?
                          .iter()
                          .bind_iter::<_, (_, sqlite::Value)>([
                              (1, secret.clone().into()),
                              (2, repo.into()),
                          ])?
                          .map(|_| 0)
                          .sum(); // Evaluate statement.

    let secret_url = format!("{}/api/v1/repos/{}/actions/secrets/PACK_REPO_SECRET", &state.config.gitea_host, repo);
    let data = GiteaSetSecret { data: secret };
    let _: Empty = gitea_api(secret_url.as_str(), Method::PUT, &data, token).await?;
    Ok(())
}

async fn update_feature(state: &ServerState<'_>, repo: &str, feature: &str) -> Result<()> {
    let feat_num: u64 = 1 << (RepoFeature::try_from(feature)? as u64);

    // Update feature in database. (feature = feature ^ feat_num) and get result.
    let features = state.sql.prepare(crate::query::UPDATE_REPO_FEATURES)?
                            .iter()
                            .bind_iter::<_, (_, sqlite::Value)>([
                                (1, (feat_num as i64).into()),
                                (2, repo.into()),
                            ])?
                            .map(|row| -> Result<u64> {
                                Ok(row?.read::<i64, _>("features") as u64)
                            })
                            .collect::<Result<Vec<u64>>>()?[0]; // Evaluate statement.

    // Check added or removed and update folders accordingly.
    let added = (features & feat_num) == feat_num;
    let dir = path::Path::new(&state.config.upload_path).join(repo).join(feature);
    if added {
        fs::create_dir(&dir)?;
        fs::set_permissions(dir, Permissions::from_mode(FOLDER_PERM))?;
    } else {
        fs::remove_dir_all(dir)?;
    }
    Ok(())
}

pub async fn patch_repo(State(state): State<ServerState<'_>>,
                        Path((owner, repo)): Path<(String, String)>,
                        AuthBearer(token): AuthBearer,
                        Json(payload): Json<PatchRepoRequest>) -> Result<()> {
    let repo = format!("{owner}/{repo}").to_lowercase(); // Repos are case-insensitive.
    let _ = authorize(&state.config.gitea_host, &token, &repo, "admin").await?;

    if payload.secret {
        return update_secret(&state, &repo, &token).await;
    }
    update_feature(&state, &repo, &payload.feature).await
}

#[derive(Serialize)]
pub struct Entry {
    pub name: String,
    pub name_uri: String,
    pub icon: &'static str,
    pub size: String,
}

fn entry_from_dir_entry(entry: std::io::Result<fs::DirEntry>) -> Result<Entry> {
    let path = entry?.path();
    let name = path.file_name().unwrap().to_str().ok_or(ERR_OS_STR_UTF)?.to_owned();
    let name_uri = urlencoding::encode(&name).to_string();
    let metadata = path.metadata()?;

    if metadata.is_dir() {
        return Ok(Entry{
          name, name_uri, icon: "folder", size: "—".to_owned(),
        });
    }
    let size = ByteSize::b(metadata.len()).display().iec().to_string();

    // Get file mime data.
    let out = Command::new("file").args(["-b", "--mime", path.to_str().ok_or(ERR_OS_STR_UTF)?]).output()?;
    let out = String::from_utf8(out.stdout).map_err(|_| ERR_FILE_CALL_UTF)?;
    let out = out.trim().split("; ").collect::<Vec<_>>();

    // Example expected output: text/plain; charset=us=ascii
    (out.len() == 2).then_some(0).ok_or(ERR_FILE_CALL_UNEXPECTED)?;
    let mime = out[0];
    let charset = &out[1][8..];

    let icon = if &mime[..4] == "text" {
        "text"
    } else if charset == "binary" {
        match mime {
            "application/gzip" => "archive",
            "application/zip" => "archive",
            _ => "binary"
        }
    } else {
        ""
    };

    Ok(Entry{ name, name_uri, icon, size })
}

fn sort_entry(a: &Entry, b: &Entry) -> Ordering {
     // Sort list by alphabetical folder lowest (so it appears at the top).
    let (a_fol, b_fol) = (a.icon == "folder", b.icon == "folder");
    match (a_fol, b_fol) {
        (true, true) => a.name.to_lowercase().cmp(&b.name.to_lowercase()),
        (true, false) => Ordering::Less,
        (false, true) => Ordering::Greater,
        (false, false) => a.name.to_lowercase().cmp(&b.name.to_lowercase()),
    }
}


#[derive(Serialize)]
pub struct GetEntryResponse {
    entries: Vec<Entry>,
}

pub async fn get_entry(State(state): State<ServerState<'_>>,
                        Path((owner, repo, path)): Path<(String, String, String)>,
                        AuthBearer(token): AuthBearer) -> Result<Response> {
    let repo = format!("{owner}/{repo}").to_lowercase(); // Repos are case-insensitive.
    let target = format!("{repo}/{path}");

    let _ = authorize(&state.config.gitea_host, &token, &repo, "pull").await?;

    let dir = path::Path::new(&state.config.upload_path).join(&target);

    let metadata = match fs::metadata(&dir) {
        Ok(x) => x,
        Err(_) => return Ok(StatusCode::NOT_FOUND.into_response()),
    };

    if metadata.is_dir() { // Return JSON.
        let dir = fs::read_dir(&dir)?;
        let mut entries = dir.map(entry_from_dir_entry).collect::<Result<Vec<Entry>>>()?;
        entries.sort_by(sort_entry);
        Ok(Json(entries).into_response())
    } else { // Redirect to file.
        Ok(Redirect::temporary(format!("/r/{target}").as_str()).into_response())
    }
}

pub async fn delete_entry(State(state): State<ServerState<'_>>,
                        Path((owner, repo,path)): Path<(String, String, String)>,
                        AuthBearer(token): AuthBearer) -> Result<StatusCode> {
    let repo = format!("{owner}/{repo}").to_lowercase(); // Repos are case-insensitive.
    let target = format!("{repo}/{path}");

    let _ = authorize(&state.config.gitea_host, &token, &repo, "admin").await?;

    let dir = path::Path::new(&state.config.upload_path).join(target);
    let metadata = match fs::metadata(&dir) {
        Ok(x) => x,
        Err(_) => return Ok(StatusCode::NOT_FOUND),
    };

    if metadata.is_dir() {
        fs::remove_dir_all(&dir)?;
    } else if metadata.is_file() || metadata.is_symlink() {
        fs::remove_file(&dir)?;
    } else {
        return Err(ERR_IMPOSSIBLE_ENTRY)?;
    }

    Ok(StatusCode::OK)
}

#[derive(Default)]
struct UploadFile {
    name: String,
    data: Bytes,
    folder: String,
}

pub async fn upload(State(state): State<ServerState<'_>>,
                    Path((owner, repo, feature)): Path<(String, String, String)>,
                    AuthBearer(user_secret): AuthBearer,
                    mut multipart: Multipart) -> Result<()> {
    let repo = format!("{owner}/{repo}").to_lowercase(); // Repos are case-insensitive.
    let feature = feature.to_lowercase();

    let (secret, features) = &state.sql.prepare(crate::query::UPLOAD_QUERY)?
                                    .iter()
                          .bind((1, repo.as_str()))?
                          .map(|row| -> Result<(String, FeatureList)> {
                              let row = row?;
                              Ok(
                                  (row.read::<&str, _>("secret").to_owned(),
                                    as_feature_list(row.read::<i64, _>("features") as u64))
                              )
                          })
                          .collect::<Result<Vec<(String, FeatureList)>>>()?[0];

    (user_secret == *secret).then_some(0)
                            .ok_or(ApiError::Unauthorized{ repo: repo.to_owned() })?;

    features.contains(&feature).then_some(0)
                            .ok_or(ApiError::DisabledFeature{ feature: feature.clone() })?;

    // Process multipart.
    let mut file = UploadFile{ folder: "".to_owned(), ..Default::default() };
    while let Some(field) = multipart.next_field().await? {
        let name = match field.name() {
            Some(x) => x,
            None => continue,
        };

        match name {
            "name" => file.name = field.text().await?,
            "file" => file.data = field.bytes().await?,
            "folder" => file.folder = field.text().await?,
            _ => continue,
        }
    }

    let dir = path::Path::new(&state.config.upload_path).join(&repo).join(feature);
    let filepath = dir.join(&file.name);
    fs::write(&filepath, file.data)?;
    fs::set_permissions(&filepath, Permissions::from_mode(FILE_PERM))?;

    let tardir = dir.join(&file.folder);
    if file.folder != *"" {
        if fs::exists(&tardir)? {
            fs::remove_dir_all(&tardir)?;
        }

        fs::create_dir(&tardir)?;
        fs::set_permissions(&tardir, Permissions::from_mode(FOLDER_PERM))?;
        let tardir_s = tardir.to_str().unwrap();
        let output = Command::new("tar").args(["-xf", filepath.to_str().unwrap(), "-C", tardir_s])
                           .output()?;

        // If there was an error, remove everything because the operation was unsucessful.
        if !output.status.success() {
            fs::remove_dir_all(&tardir)?;
            fs::remove_file(&filepath)?;
            return Err(ERR_UNTAR)?
        }

        // Run chmod to set extracted folder permissions.
        Command::new("find").args([tardir_s, "-type", "f", "-exec", "chmod", "0640", "{}", "+"])
                           .output()?;
        Command::new("find").args([tardir_s, "-type", "d", "-exec", "chmod", "0750", "{}", "+"])
                           .output()?;
    }
    Ok(())
}

pub async fn status_to_404(request: axum::extract::Request, next: Next) -> Response {
    let mut response = next.run(request).await;
    *response.status_mut() = StatusCode::NOT_FOUND;
    response
}

pub async fn get_not_found(request: axum::extract::Request) -> Response {
    let resp = ServeFile::new("static/404.html").try_call(request).await.unwrap();
    let mut resp = resp.map(Body::new);
    *resp.status_mut() = StatusCode::NOT_FOUND;
    resp
}

pub async fn auth_file_routing(State(state): State<ServerState<'_>>,
                               Path((owner, path)): Path<(String, String)>,
                               headers: HeaderMap,
                               jar: CookieJar,
                               mut request: axum::extract::Request,
                               next: Next) -> Result<Response> {
    *request.uri_mut() = format!("/{owner}/{path}").parse::<Uri>().unwrap();
    let target = format!("{owner}/{path}");

    let mut path_s: Vec<_> = path.split("/").collect();
    let repo = path_s.remove(0);
    let repo = format!("{owner}/{repo}").to_lowercase(); // Repos are case-insensitive.
    let no_delete = path_s.is_empty() || path_s[0].is_empty(); // We must be on the feature-selection page.

    // If we find an authorization, it is probably a redirect from /api/files
    let token = if let Some(x) = headers.get(AUTHORIZATION)  {
        x.to_str()
         .map_err(|_| ApiError::Tokenless)?
         .to_owned()
    } else { // Otherwise, this is regular browsing, if no cookie token, user needs to login.
        match jar.get("token") {
            Some(x) => x.value_trimmed().to_owned(),
            None => return Ok(Redirect::temporary("/").into_response()),
        }
    };

    // We use a timed hash map to temporarily store tokens. This is to prevent
    // flooding Gitea with authorization requests for each small HTTP request
    // when viewing inner sites. (Ex: loading assets for docs/)
    let is_admin = match state.token_map.get(&token) {
        Some(x) => x, // If it returns, then continue.
        None => {
            // Check if user can view repo.
            match authorize(&state.config.gitea_host, &token, &repo, "pull").await {
                Ok(json) => {
                    let perm = json.get("permissions").unwrap().get("admin").unwrap().as_bool().unwrap();
                    // Store this in the timed hash map for 5 minutes.
                    state.token_map.insert(token, perm, Duration::new(300, 0));
                    perm
                },
                Err(e) => {
                    let e = match e {
                        ApiError::RequestError(x) => x,
                        _ => return Err(e) // Some other error, return it.
                    };

                    // If the error is unauthorized, try refreshing the token.
                    // If it's not found, return not found.
                    // Otherwise, it's unknown and we send back to "/".
                    let refresh = format!("/refresh?target=/r/{target}");
                    return match e.status() {
                        Some(StatusCode::UNAUTHORIZED) => Ok(Redirect::temporary(&refresh).into_response()),
                        Some(StatusCode::NOT_FOUND) => Ok(get_not_found(request).await),
                        _ => Ok(Redirect::temporary("/").into_response()),
                    };
                }
            }
        }
    };


    let dir = path::Path::new(&state.config.upload_path).join(&target);
    let mut dir = match fs::read_dir(&dir) {
        Ok(x) => {
            match fs::exists(dir.join("index.html"))? {
                true => {
                    if !path.ends_with('/') {
                        // Need to make sure for a website given to ServeDir, this needs to end in a /, othewrise
                        // ServerDir will issue a redirect with a {uri}/, but this is at the wrong location,
                        // since this does not contain the /r/ prefix.
                        *request.uri_mut() = format!("/{owner}/{path}/").parse::<Uri>().unwrap();
                    }
                    return Ok(next.run(request).await); // index.html exists, so pass to ServeDir.
                }
                false => x.peekable(), // We need to get the directories.
            }
        },
        Err(_) => return Ok(next.run(request).await), // Not a directory or file or not found, so pass to ServeDir.
    };

    if dir.peek().is_none() {
        return Ok(get_not_found(request).await);
    }

    // At this point, we should send an page with the list of files.
    let mut entries = dir.map(entry_from_dir_entry).collect::<Result<Vec<Entry>>>()?;
    entries.sort_by(sort_entry);

    Ok(Html(crate::compile::content_folder(&state.config, target, &entries, is_admin, no_delete)?).into_response())
}