use std::env::set_current_dir;
use std::fs;
use std::io::{BufRead, BufReader};
use std::path::Path;
use std::process::{Command, Stdio};
use std::thread::sleep;
use std::time::Duration;

use rand::prelude::*;

trait ExitStatusExt {
    fn check(self);
}

impl ExitStatusExt for std::process::ExitStatus {
    fn check(self) {
        assert!(self.success());
    }
}

const CARGO: &str = env!("CARGO");
const PROJECT_DIR: &str = env!("CARGO_MANIFEST_DIR");
const TOSIN_ADMIN: &str = env!("CARGO_BIN_EXE_tosin-admin");

fn get(url: &str) -> (hyper::StatusCode, String) {
    let get = async {
        use hyper::Client;

        let client = Client::new();

        let res = client.get(url.parse().unwrap()).await.unwrap();

        let status = res.status();

        let body = hyper::body::to_bytes(res).await.unwrap();
        let body = String::from_utf8_lossy(&body).into_owned();

        (status, body)
    };
    tokio::runtime::Builder::new_multi_thread()
        .enable_all()
        .build()
        .unwrap()
        .block_on(get)
}

pub fn step1() {
    // tosin-admin start-project {dest}
    set_current_dir(PROJECT_DIR).unwrap();
    set_current_dir("target").unwrap();
    if fs::metadata("tests").is_err() {
        fs::create_dir("tests").unwrap();
    }
    set_current_dir("tests").unwrap();
    fs::write("Cargo.toml", "[workspace]\nmembers = ['tutorial']").unwrap();
    if fs::metadata("tutorial").is_ok() {
        fs::remove_dir_all("tutorial").unwrap();
    }
    Command::new(TOSIN_ADMIN)
        .args(&["start-project", "tutorial"])
        .status()
        .unwrap()
        .check();
    set_current_dir("tutorial").unwrap();
    assert!(fs::metadata("Cargo.toml").is_ok());
    assert!(fs::read_to_string("Cargo.toml")
        .unwrap()
        .contains("tosin = "));
    assert!(fs::metadata("src/main.rs").is_ok());
    assert!(fs::read_to_string("src/main.rs")
        .unwrap()
        .contains("tosin::main!"));

    // cargo run run-server
    let port = thread_rng().gen_range(8081u16..9000u16);
    let mut server = Command::new(CARGO)
        .args(&["run", "run-server", &format!("{}", port)])
        .stdout(Stdio::piped())
        .spawn()
        .unwrap();
    let mut server_output = String::new();
    let server_stdout = server.stdout.take().unwrap();
    let mut server_stdout = BufReader::new(server_stdout);
    server_stdout.read_line(&mut server_output).unwrap();
    assert!(server_output.contains(&format!("http://127.0.0.1:{}", port)));
    sleep(Duration::from_secs_f32(0.5));
    let server_poke = get(&format!("http://127.0.0.1:{}/", port));
    assert_eq!(server_poke.0, hyper::StatusCode::NOT_FOUND);
    if let Ok(Some(exit_status)) = server.try_wait() {
        exit_status.check();
    }
    server.kill().unwrap();

    // tosin-admin start-app polls
    Command::new(TOSIN_ADMIN)
        .args(&["start-app", "polls"])
        .status()
        .unwrap()
        .check();
    assert!(fs::metadata("src/polls/mod.rs").is_ok());

    // write views.rs
    fs::write(
        "src/polls/views.rs",
        r#"
use tosin::http::{Reply, Response};

pub fn index() -> Response {
    "Hello, world. You're at the polls index.".into_response()
}
    "#,
    )
    .unwrap();

    // write urls.rs
    fs::write(
        "src/polls/urls.rs",
        r#"
use tosin::urls::{UrlMap, url_map};

use super::views;

pub fn urls() -> UrlMap {
    url_map! {
        => views::index, // TODO name: "index"
    }
}
    "#,
    )
    .unwrap();

    // update main.rs
    fs::write(
        "src/main.rs",
        r#"
#[macro_use] extern crate diesel;

use tosin::Settings;
use tosin::contrib::admin;
use tosin::db::backend::Connectable;
use tosin::urls::{UrlMap, url_map};

mod polls;

fn urls() -> UrlMap {
    url_map! {
        "polls" / ..polls::urls(),
        "admin" / ..admin::site::urls(),
    }
}

fn settings() -> Settings<impl Connectable> {
    Settings {
        ..Settings::default()
    }
}

tosin::main!(urls(), settings());
    "#,
    )
    .unwrap();

    // poke that new route
    let port = thread_rng().gen_range(8081u16..9000u16);
    let mut server = Command::new(CARGO)
        .args(&["run", "run-server", &format!("{}", port)])
        .stdout(Stdio::piped())
        .spawn()
        .unwrap();
    let mut server_output = String::new();
    let server_stdout = server.stdout.take().unwrap();
    let mut server_stdout = BufReader::new(server_stdout);
    server_stdout.read_line(&mut server_output).unwrap();
    assert!(server_output.contains(&format!("http://127.0.0.1:{}", port)));
    sleep(Duration::from_secs_f32(0.5));
    let server_poke = get(&format!("http://127.0.0.1:{}/polls/", port));
    assert_eq!(server_poke.0, hyper::StatusCode::OK);
    assert_eq!(server_poke.1, "Hello, world. You're at the polls index.");
    server.kill().unwrap();

    // vibe check
    let test_tutorial1 = Path::new("src");
    let example_tutorial1 = Path::new(PROJECT_DIR).join("examples/tutorial01");
    for file in &[
        "main.rs",
        "polls/mod.rs",
        "polls/migrations/mod.rs",
        "polls/models.rs",
        "polls/urls.rs",
        "polls/views.rs",
    ] {
        let test_path = test_tutorial1.join(file);
        let test_file = fs::read_to_string(test_path).unwrap();
        let example_path = example_tutorial1.join(file);
        let example_file = fs::read_to_string(example_path).unwrap();
        assert_eq!(test_file.trim(), example_file.trim());
    }
}

pub fn step2() {
    step1();
    // update main.rs
    fs::write(
        "src/main.rs",
        r#"
#[macro_use] extern crate diesel;

use tosin::Settings;
use tosin::contrib::admin;
use tosin::db::backend::Connectable;
use tosin::urls::{UrlMap, url_map};

mod polls;

fn urls() -> UrlMap {
    url_map! {
        "polls" / ..polls::urls(),
        "admin" / ..admin::site::urls(),
    }
}

fn settings() -> Settings<impl Connectable> {
    Settings {
        installed_apps: &[
            &admin::APP,
        ],
        ..Settings::default()
    }
}

tosin::main!(urls(), settings());
    "#,
    )
    .unwrap();

    // cargo run migrate
    Command::new(CARGO)
        .args(&["run", "migrate"])
        .status()
        .unwrap()
        .check();

    // update Cargo.toml
    fs::write(
        "Cargo.toml",
        r#"
[package]
name = "tutorial"
version = "0.1.0"
edition = "2018"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
chrono = "0.4"
diesel = { version = "1.4.4", features = ["sqlite"] }
tosin = { path = "../../.." }
    "#,
    )
    .unwrap();

    // update polls/models.rs
    fs::write(
        "src/polls/models.rs",
        r#"
use tosin::db::models::{Model, Id, gather};

#[derive(Model)]
pub struct Question {
    id: Option<Id>,
    #[model(max_length=200)]
    question_text: String,
    /// date published
    pub_date: chrono::NaiveDateTime,
}

#[derive(Model)]
pub struct Choice {
    id: Option<Id>,
    #[model(Question, on_delete=Cascade)]
    question: Id,
    #[model(max_length=200)]
    choice_text: String,
    #[model(default = 0)]
    votes: usize,
}

gather!();
    "#,
    )
    .unwrap();

    // update main.rs
    fs::write(
        "src/main.rs",
        r#"
#[macro_use] extern crate diesel;

use tosin::Settings;
use tosin::contrib::admin;
use tosin::db::backend::Connectable;
use tosin::urls::{UrlMap, url_map};

mod polls;

fn urls() -> UrlMap {
    url_map! {
        "polls" / ..polls::urls(),
        "admin" / ..admin::site::urls(),
    }
}

fn settings() -> Settings<impl Connectable> {
    Settings {
        installed_apps: &[
            &polls::APP,
            &admin::APP,
        ],
        ..Settings::default()
    }
}

tosin::main!(urls(), settings());
    "#,
    )
    .unwrap();

    // cargo run make-migrations
    Command::new(CARGO)
        .args(&["run", "make-migrations"])
        .status()
        .unwrap()
        .check();

    // cargo run migrate
    Command::new(CARGO)
        .args(&["run", "migrate"])
        .status()
        .unwrap()
        .check();
}