use std::path::{Path, PathBuf};
use anyhow::{Result, Context, bail};
use std::fs;
use colored::*;

pub mod android;
pub mod ftc;
pub mod gradle;
pub mod proxy;

pub struct SdkConfig {
    pub ftc_sdk_path: PathBuf,
    pub android_sdk_path: PathBuf,
    pub cache_dir: PathBuf,
}

impl SdkConfig {
    pub fn new() -> Result<Self> {
        // Allow tests (or power users) to override the cache directory.
        // When WEEVIL_HOME is set, we also skip the system Android SDK
        // search so tests are fully isolated.
        let (cache_dir, android_sdk_path) = if let Ok(weevil_home) = std::env::var("WEEVIL_HOME") {
            let cache = PathBuf::from(weevil_home);
            let android = cache.join("android-sdk");
            (cache, android)
        } else {
            let home = dirs::home_dir()
                .context("Could not determine home directory")?;
            let cache = home.join(".weevil");
            let android = Self::find_android_sdk().unwrap_or_else(|| cache.join("android-sdk"));
            (cache, android)
        };
        
        fs::create_dir_all(&cache_dir)?;
        
        Ok(Self {
            ftc_sdk_path: cache_dir.join("ftc-sdk"),
            android_sdk_path,
            cache_dir,
        })
    }
    
    pub fn with_paths(ftc_sdk: Option<&str>, android_sdk: Option<&str>) -> Result<Self> {
        let mut config = Self::new()?;
        
        if let Some(path) = ftc_sdk {
            config.ftc_sdk_path = PathBuf::from(path);
        }
        
        if let Some(path) = android_sdk {
            config.android_sdk_path = PathBuf::from(path);
        }
        
        Ok(config)
    }
    
    fn find_android_sdk() -> Option<PathBuf> {
        // Check common locations
        let home = dirs::home_dir()?;
        
        let candidates = vec![
            home.join("Android/Sdk"),
            home.join(".android-sdk"),
            PathBuf::from("/usr/lib/android-sdk"),
        ];
        
        for candidate in candidates {
            if candidate.join("platform-tools").exists() {
                return Some(candidate);
            }
        }
        
        None
    }
    
    #[allow(dead_code)]
    pub fn validate(&self) -> Result<()> {
        if !self.ftc_sdk_path.exists() {
            bail!(
                "FTC SDK not found at: {}\nRun: weevil sdk install",
                self.ftc_sdk_path.display()
            );
        }
        
        if !self.android_sdk_path.exists() {
            bail!(
                "Android SDK not found at: {}\nRun: weevil sdk install",
                self.android_sdk_path.display()
            );
        }
        
        Ok(())
    }
    
    pub fn print_status(&self) {
        println!("{}", "SDK Configuration:".bright_yellow().bold());
        println!();
        
        self.print_sdk_status("FTC SDK", &self.ftc_sdk_path);
        self.print_sdk_status("Android SDK", &self.android_sdk_path);
        
        println!();
        println!("{}: {}", "Cache Directory".bright_yellow(), self.cache_dir.display());
    }
    
    fn print_sdk_status(&self, name: &str, path: &Path) {
        let status = if path.exists() {
            format!("{} {}", "✓".green(), path.display())
        } else {
            format!("{} {} {}", "✗".red(), path.display(), "(not found)".red())
        };
        
        println!("{}: {}", name.bright_yellow(), status);
    }
}