//! Soft-link with `config.toml`
//!
//! leetcode-cli will generate a `leetcode.toml` by default,
//! if you wanna change to it, you can:
//!
//! + Edit leetcode.toml at `~/.leetcode/leetcode.toml` directly
//! + Use `leetcode config` to update it
use serde::{Deserialize, Serialize};
use std::{collections::HashMap, fs, path::PathBuf};

const DEFAULT_CONFIG: &str = r#"
# usually you don't wanna change those
[sys]
categories = [
  "algorithms",
  "database",
  "shell"
]

langs = [
  "bash",
  "c",
  "cpp",
  "csharp",
  "golang",
  "java",
  "javascript",
  "kotlin",
  "mysql",
  "php",
  "python",
  "python3",
  "ruby",
  "rust",
  "scala",
  "swift"
]

[sys.urls]
base = "https://leetcode.com"
graphql = "https://leetcode.com/graphql"
login = "https://leetcode.com/accounts/login/"
problems = "https://leetcode.com/api/problems/$category/"
problem = "https://leetcode.com/problems/$slug/description/"
tag = "https://leetcode.com/tag/$slug/"
test = "https://leetcode.com/problems/$slug/interpret_solution/"
session = "https://leetcode.com/session/"
submit = "https://leetcode.com/problems/$slug/submit/"
submissions = "https://leetcode.com/api/submissions/$slug"
submission = "https://leetcode.com/submissions/detail/$id/"
verify = "https://leetcode.com/submissions/detail/$id/check/"
favorites = "https://leetcode.com/list/api/questions"
favorite_delete = "https://leetcode.com/list/api/questions/$hash/$id"

[code]
editor = "vim"
lang = "rust"
pick = "${fid}.${slug}"
submission = "${fid}.${slug}.${sid}.${ac}"

[cookies]
csrf = ""
session = ""

[storage]
cache = "Problems"
code = "code"
root = "~/.leetcode"
scripts = "scripts"
"#;

/// Sync with `~/.leetcode/config.toml`
#[derive(Clone, Debug, Deserialize, Serialize)]
pub struct Config {
    pub sys: Sys,
    pub code: Code,
    pub cookies: Cookies,
    pub storage: Storage,
}

impl Config {
    /// Sync new config to config.toml
    pub fn sync(&self) -> Result<(), crate::Error> {
        let home = dirs::home_dir()?;
        let conf = home.join(".leetcode/leetcode.toml");
        fs::write(conf, toml::ser::to_string_pretty(&self)?)?;

        Ok(())
    }
}

/// Cookie settings
#[derive(Clone, Debug, Deserialize, Serialize)]
pub struct Cookies {
    pub csrf: String,
    pub session: String,
}

/// System settings, for leetcode api mainly
#[derive(Clone, Debug, Deserialize, Serialize)]
pub struct Sys {
    pub categories: [String; 3],
    pub langs: [String; 16],
    pub urls: HashMap<String, String>,
}

/// Leetcode API
#[derive(Clone, Debug, Deserialize, Serialize)]
pub struct Urls {
    pub base: String,
    pub graphql: String,
    pub login: String,
    pub problems: String,
    pub problem: String,
    pub test: String,
    pub session: String,
    pub submit: String,
    pub submissions: String,
    pub submission: String,
    pub verify: String,
    pub favorites: String,
    pub favorite_delete: String,
}

/// default editor and langs
///
/// + support editor: [emacs, vim]
/// + support langs: all in config
#[derive(Clone, Debug, Deserialize, Serialize)]
pub struct Code {
    pub editor: String,
    pub lang: String,
    pub pick: String,
    pub submission: String,
}

/// Locate code files
///
/// + cache -> the path to cache
#[derive(Clone, Debug, Deserialize, Serialize)]
pub struct Storage {
    cache: String,
    code: String,
    root: String,
    scripts: Option<String>,
}

impl Storage {
    /// convert root path
    pub fn root(&self) -> Result<String, crate::Error> {
        let home = dirs::home_dir()?.to_string_lossy().to_string();
        let path = self.root.replace("~", &home);
        Ok(path)
    }

    /// get cache path
    pub fn cache(&self) -> Result<String, crate::Error> {
        let root = &self.root()?;
        Ok(PathBuf::from(root)
            .join(&self.cache)
            .to_string_lossy()
            .to_string())
    }

    /// get code path
    pub fn code(&self) -> Result<String, crate::Error> {
        let root = &self.root()?;
        let p = PathBuf::from(root).join(&self.code);
        if !PathBuf::from(&p).exists() {
            std::fs::create_dir(&p)?
        }

        Ok(p.to_string_lossy().to_string())
    }

    /// get scripts path
    pub fn scripts(mut self) -> Result<String, crate::Error> {
        let root = &self.root()?;
        if self.scripts.is_none() {
            let tmp = toml::from_str::<Config>(&DEFAULT_CONFIG)?;
            self.scripts = Some(tmp.storage.scripts?);
        }

        let p = PathBuf::from(root).join(&self.scripts?);
        if !PathBuf::from(&p).exists() {
            std::fs::create_dir(&p)?
        }

        Ok(p.to_string_lossy().to_string())
    }
}

/// Locate lc's config file
pub fn locate() -> Result<Config, crate::Error> {
    let conf = root()?.join("leetcode.toml");
    if !conf.is_file() {
        fs::write(&conf, &DEFAULT_CONFIG[1..])?;
    }

    let s = fs::read_to_string(&conf)?;
    Ok(toml::from_str::<Config>(&s)?)
}

/// Get root path of leetcode-cli
pub fn root() -> Result<std::path::PathBuf, crate::Error> {
    let dir = dirs::home_dir()?.join(".leetcode");
    if !dir.is_dir() {
        info!("Generate root dir at {:?}.", &dir);
        fs::DirBuilder::new().recursive(true).create(&dir)?;
    }

    Ok(dir)
}