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use reqwest::{header, Client};
use serde::{de::DeserializeOwned, Deserialize, Serialize};
use url::Url;

#[async_trait::async_trait]
pub trait Api {
    async fn login(&self, request: LoginRequest) -> anyhow::Result<LoginResponse>;

    async fn create_project(
        &self,
        request: CreateProjectRequest,
        token: String,
    ) -> anyhow::Result<CreateProjectResponse>;

    async fn register_task_version(
        &self,
        request: CreateTaskVersionRequest,
        token: String,
    ) -> anyhow::Result<CreateTaskVersionResponse>;
}

#[derive(Serialize, Deserialize)]
pub struct Error {
    pub message: String,
    pub chain: Vec<String>,
}

impl<'a> From<&'a anyhow::Error> for Error {
    fn from(err: &'a anyhow::Error) -> Self {
        Error {
            message: err.to_string(),
            chain: err.chain().map(|e| e.to_string()).collect::<Vec<_>>(),
        }
    }
}

impl From<Error> for anyhow::Error {
    fn from(value: Error) -> Self {
        match value.chain.as_slice() {
            [] => anyhow::Error::msg(value.message),
            [head @ .., last] => head
                .into_iter()
                .rev()
                .fold(anyhow::Error::msg(last.to_string()), |e, m| {
                    e.context(m.to_string())
                }),
        }
    }
}

#[derive(Serialize, Deserialize)]
pub struct LoginRequest {
    pub email: String,
    pub password: String,
}

#[derive(Serialize, Deserialize)]
pub enum LoginResponse {
    CreatedAccount { email: String, token: String },
    LoggedIn { email: String, token: String },
}

#[derive(Serialize, Deserialize)]
pub struct CreateProjectRequest {
    pub nickname: Option<String>,
}

#[derive(Serialize, Deserialize)]
pub struct CreateProjectResponse {
    pub id: String,
    pub nickname: Option<String>,
}

#[derive(Serialize, Deserialize)]
pub struct CreateTaskVersionRequest {
    pub project_id: String,
    pub task_id: String,
}

#[derive(Serialize, Deserialize, Debug)]
pub struct CreateTaskVersionResponse {
    pub project_id: String,
    pub task_id: String,
    pub hash: String,
    pub created_at: chrono::NaiveDateTime,
}

#[derive(Serialize, Deserialize, PartialEq, Eq)]
#[serde(rename_all = "snake_case")]
pub enum Method {
    Login,
    CreateProject,
    RegisterTaskVersion,
}

pub struct HttpApi {
    client: Client,
    base: Url,
}

impl HttpApi {
    pub fn new(base: &Url) -> anyhow::Result<Self> {
        anyhow::ensure!(base.as_str().ends_with("/"), "API url must end with a /");

        Ok(Self {
            client: Client::new(),
            base: base.clone(),
        })
    }

    async fn call_endpoint<I, O>(
        &self,
        endpoint: Method,
        body: I,
        token: impl Into<Option<String>>,
    ) -> anyhow::Result<O>
    where
        I: Serialize,
        O: DeserializeOwned,
    {
        let url = self.base.join(&serde_json::to_string(&endpoint)?)?;
        let request = self.client.post(url);
        let request = if let Some(token) = token.into() {
            request.header(header::AUTHORIZATION, format!("Bearer {token}"))
        } else {
            request
        };

        let response = request.json(&body).send().await?;

        let status = response.status();
        if status.is_success() {
            Ok(response.json().await?)
        } else if status.is_client_error() || status.is_server_error() {
            Err(response.json::<Error>().await?.into())
        } else {
            anyhow::bail!("Unhandled error code {}", status);
        }
    }
}

#[async_trait::async_trait]
impl Api for HttpApi {
    async fn login(&self, request: LoginRequest) -> anyhow::Result<LoginResponse> {
        self.call_endpoint(Method::Login, request, None).await
    }

    async fn create_project(
        &self,
        request: CreateProjectRequest,
        token: String,
    ) -> anyhow::Result<CreateProjectResponse> {
        self.call_endpoint(Method::CreateProject, request, token)
            .await
    }

    async fn register_task_version(
        &self,
        request: CreateTaskVersionRequest,
        token: String,
    ) -> anyhow::Result<CreateTaskVersionResponse> {
        self.call_endpoint(Method::RegisterTaskVersion, request, token)
            .await
    }
}