use axum::{
  extract::{Query, State},
  http::StatusCode,
  routing::get,
  Json, Router,
};
use chrono::{prelude::*, Duration, ParseError};
use serde::{Deserialize, Serialize};
use std::{env, ops::Deref, sync::Arc};

mod db;
mod generate;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
  // 根据操作系统选择数据库路径
  let db_path: String = env::current_dir()
    .expect("无法获取当前目录")
    .join("authorize_data/database.db")
    .to_string_lossy()
    .into_owned();

  let db = Arc::new(db::Db::new(db_path).await?);
  let generator = Arc::new(
    generate::TokenGenerator::new()
      .with_uppercase(true)
      .with_lowercase(true)
      .with_numbers(true),
  );

  let state = AppState { db, generator };
  let app = Router::new()
    .route("/create", get(create_token))
    .route("/verify", get(verify_token))
    .route("/info", get(get_token_info))
    .route("/reset", get(update_token_status))
    .route("/renewal", get(renewal_token))
    .route("/project", get(get_projects))
    .with_state(state);

  let listener = tokio::net::TcpListener::bind("0.0.0.0:3009").await?;
  axum::serve(listener, app).await?;
  Ok(())
}

async fn create_token(
  State(state): State<AppState>,
  Query(args): Query<CreateToken>,
) -> (StatusCode, Json<CreateTokenInfo>) {
  let exists = state
    .db
    .exists_project(&args.project, &args.device_id)
    .await
    .unwrap();
  match exists {
    Some(info) => {
      return (
        StatusCode::OK,
        Json(CreateTokenInfo {
          code: 404,
          project: info.project,
          device_id: info.device_id,
          token: info.token,
          msg: "token已存在，请勿重复创建".to_owned(),
        }),
      )
    }
    None => (),
  }
  let str_time = get_current_datetime();
  let exp_time = add_day(&str_time, 7).unwrap();

  let token: String = state.generator.generate(16);
  let _token_id = state
    .db
    .insert_authorize(InsertArgs {
      project: args.project.clone(),
      token: token.clone(),
      device_id: args.device_id.clone(),
      disable: 1,
      expire: exp_time,
      insert_time: str_time,
    })
    .await;

  (
    StatusCode::OK,
    Json(CreateTokenInfo {
      code: 200,
      project: args.project,
      device_id: args.device_id,
      token,
      msg: "token创建成功".to_owned(),
    }),
  )
}

async fn verify_token(
  State(state): State<AppState>,
  Query(args): Query<VerifyToken>,
) -> (StatusCode, Json<VerifyResult>) {
  if state.db.verify_token(&args.token).await.unwrap() {
    (
      StatusCode::OK,
      Json(VerifyResult {
        code: 200,
        msg: "正常".to_owned(),
      }),
    )
  } else {
    (
      StatusCode::OK,
      Json(VerifyResult {
        code: 404,
        msg: "token已过期".to_owned(),
      }),
    )
  }
}

async fn get_token_info(
  State(state): State<AppState>,
  Query(args): Query<VerifyToken>,
) -> (StatusCode, Json<TokenResponse>) {
  let auth_info = state.db.get_token_info(&args.token).await.unwrap();
  match auth_info {
    Some(auth) => {
      let v = auth.into_inner();

      (
        StatusCode::OK,
        Json(TokenResponse::Success(TokenInfo {
          code: 200,
          project: v.project,
          token: v.token,
          device_id: v.device_id,
          disable: v.disable,
          expire: v.expire,
          insert_time: v.insert_time,
        })),
      )
    }
    None => (
      StatusCode::OK,
      Json(TokenResponse::Error(QueryError {
        code: 404,
        msg: "未查询token相关信息".to_owned(),
      })),
    ),
  }
}

async fn update_token_status(
  State(state): State<AppState>,
  Query(args): Query<UpdateTokenStatus>,
) -> (StatusCode, Json<VerifyResult>) {
  let result = if args.enable {
    state.db.update_token_state(&args.token, 1).await.unwrap()
  } else {
    state.db.update_token_state(&args.token, 0).await.unwrap()
  };

  if result {
    (
      StatusCode::OK,
      Json(VerifyResult {
        code: 200,
        msg: "操作成功".to_owned(),
      }),
    )
  } else {
    (
      StatusCode::OK,
      Json(VerifyResult {
        code: 404,
        msg: "操作失败".to_owned(),
      }),
    )
  }
}

async fn renewal_token(
  State(state): State<AppState>,
  Query(args): Query<RenewalToken>,
) -> (StatusCode, Json<TokenResponse>) {
  let auth_info = state
    .db
    .update_token_expiry(&args.token, args.days)
    .await
    .unwrap();
  match auth_info {
    Some(auth) => {
      let v = auth.into_inner();

      (
        StatusCode::OK,
        Json(TokenResponse::Success(TokenInfo {
          code: 200,
          project: v.project,
          token: v.token,
          device_id: v.device_id,
          disable: v.disable,
          expire: v.expire,
          insert_time: v.insert_time,
        })),
      )
    }
    None => (
      StatusCode::OK,
      Json(TokenResponse::Error(QueryError {
        code: 404,
        msg: "操作失败".to_owned(),
      })),
    ),
  }
}

/// 获取所有的项目名
async fn get_projects(
  State(state): State<AppState>,
) -> (StatusCode, Json<ProjectResponse>) {
  let projects = state.db.get_all_project().await.unwrap();

  (
    StatusCode::OK,
    Json(ProjectResponse {
      code: 200,
      projects: projects,
    }),
  )
}

fn get_current_datetime() -> String {
  Local::now().format("%Y-%m-%d %H:%M:%S").to_string()
}

fn add_day(t: &str, days: i64) -> Result<String, ParseError> {
  let date_time = NaiveDateTime::parse_from_str(t, "%Y-%m-%d %H:%M:%S")?;
  let new_time = date_time + Duration::days(days);
  Ok(new_time.format("%Y-%m-%d %H:%M:%S").to_string())
}

pub struct InsertArgs {
  pub project: String,
  pub token: String,
  pub device_id: String,
  pub disable: i8,
  pub expire: String,
  pub insert_time: String,
}

#[derive(Clone)]
struct AppState {
  db: Arc<db::Db>,
  generator: Arc<generate::TokenGenerator>,
}

#[derive(Deserialize)]
struct CreateToken {
  project: String,
  device_id: String,
}

#[derive(Deserialize, Debug, Clone)]
struct Token(String);

// 让 Token 可以像 &str 一样使用
impl Deref for Token {
  type Target = str;

  fn deref(&self) -> &Self::Target {
    &self.0
  }
}

#[derive(Deserialize)]
struct VerifyToken {
  token: Token,
}

#[derive(Deserialize)]
struct RenewalToken {
  token: Token,
  days: i64,
}

#[derive(Serialize)]
struct VerifyResult {
  code: i16,
  msg: String,
}

#[derive(Serialize)]
struct TokenInfo {
  code: i16,
  project: String,
  token: String,
  device_id: String,
  disable: i8,
  expire: String,
  insert_time: String,
}

#[derive(Serialize)]
struct QueryError {
  code: i16,
  msg: String,
}

#[derive(Serialize)]
#[serde(untagged)]
enum TokenResponse {
  Success(TokenInfo),
  Error(QueryError),
}

#[derive(Serialize)]
struct CreateTokenInfo {
  code: i16,
  project: String,
  device_id: String,
  token: String,
  msg: String,
}

#[derive(Deserialize)]
struct UpdateTokenStatus {
  token: String,
  enable: bool,
}

#[derive(Serialize)]
struct ProjectResponse {
  code: i32,
  projects: Vec<String>,
}