pub mod c;
pub mod cpp;
mod go;
mod java;
pub mod javascript;
mod php;
mod python;
mod ruby;
pub mod rust;
pub mod typescript;

use console::style;
use once_cell::sync::Lazy;
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::fmt;
use std::str::FromStr;

#[derive(Debug, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Serialize, Deserialize)]
pub enum Severity {
    High,
    Medium,
    Low,
}

impl fmt::Display for Severity {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        let s = match *self {
            Severity::High => style("HIGH").red().bold().to_string(),
            Severity::Medium => style("MEDIUM").yellow().bold().to_string(),
            Severity::Low => style("LOW").cyan().bold().to_string(),
        };
        f.write_str(&s)
    }
}

impl Severity {
    /// Textual value stored in SQLite.
    pub fn as_db_str(self) -> &'static str {
        match self {
            Severity::High => "HIGH",
            Severity::Medium => "MEDIUM",
            Severity::Low => "LOW",
        }
    }
}

impl FromStr for Severity {
    // TODO: FIX
    type Err = ();

    fn from_str(input: &str) -> Result<Self, Self::Err> {
        match input.to_lowercase().as_str() {
            "medium" => Ok(Severity::Medium),
            "high" => Ok(Severity::High),
            _ => Ok(Severity::Low),
        }
    }
}

/// One AST pattern with a tree-sitter query and meta-data.
#[derive(Debug, Clone, Serialize)]
pub struct Pattern {
    /// Unique identifier (snake-case preferred).
    pub id: &'static str,
    /// Human-readable explanation.
    pub description: &'static str,
    /// tree-sitter query string.
    pub query: &'static str,
    /// Rough severity bucket.
    pub severity: Severity,
}

/// Global, lazily-initialised registry: lang-name → pattern slice
static REGISTRY: Lazy<HashMap<&'static str, &'static [Pattern]>> = Lazy::new(|| {
    let mut m = HashMap::new();

    // ---- Rust ----
    m.insert("rust", rust::PATTERNS);

    // ---- TypeScript ----
    m.insert("typescript", typescript::PATTERNS);
    m.insert("ts", typescript::PATTERNS);
    m.insert("tsx", typescript::PATTERNS);

    // ---- JavaScript ----
    m.insert("javascript", javascript::PATTERNS);
    m.insert("js", javascript::PATTERNS);

    // ---- C & C++ ----
    m.insert("c", c::PATTERNS);
    m.insert("cpp", cpp::PATTERNS);
    m.insert("c++", cpp::PATTERNS);

    // ---- Other languages in the folder ----
    m.insert("java", java::PATTERNS);
    m.insert("go", go::PATTERNS);
    m.insert("php", php::PATTERNS);
    m.insert("python", python::PATTERNS);
    m.insert("py", python::PATTERNS);
    m.insert("ruby", ruby::PATTERNS);
    m.insert("rb", ruby::PATTERNS);

    tracing::debug!("AST-pattern registry initialised ({} languages)", m.len());

    m
});

/// Return all patterns for the requested language (case-insensitive).
///
/// Unknown languages yield an **empty** `Vec`.
pub fn load(lang: &str) -> Vec<Pattern> {
    let key = lang.to_ascii_lowercase();
    REGISTRY.get(key.as_str()).copied().unwrap_or(&[]).to_vec()
}