use serde::Serialize;

use lumotia_core::hardware::{self, Os};
use lumotia_core::recommendation;

#[derive(Serialize)]
pub struct SystemInfo {
    pub ram_mb: u64,
    pub cpu_brand: String,
    pub cpu_cores: usize,
    pub os: String,
    pub gpu: Option<String>,
}

#[derive(Serialize)]
pub struct ModelRecommendation {
    pub id: String,
    pub display_name: &'static str,
    pub disk_size_mb: u64,
    pub ram_required_mb: u64,
    pub description: &'static str,
    pub score: f64,
    pub reason: String,
    pub is_downloaded: bool,
}

/// Probe system hardware and return a summary.
#[tauri::command]
pub fn probe_system() -> Result<SystemInfo, String> {
    let profile = hardware::probe_system();
    Ok(SystemInfo {
        ram_mb: profile.ram.0,
        cpu_brand: profile.cpu.brand,
        cpu_cores: profile.cpu.logical_processors,
        os: match profile.os {
            Os::Windows => "Windows",
            Os::Linux => "Linux",
            Os::MacOs => "macOS",
            Os::Ios => "iOS",
            Os::Android => "Android",
        }
        .to_string(),
        gpu: profile.gpu.map(|g| format!("{:?}", g.vendor)),
    })
}

/// Rank models for the current system and return recommendations.
#[tauri::command]
pub fn rank_models() -> Result<Vec<ModelRecommendation>, String> {
    let profile = hardware::probe_system();
    let ranked = recommendation::rank_recommendations(&profile);

    Ok(ranked
        .into_iter()
        .map(|scored| {
            let downloaded = lumotia_transcription::is_downloaded(&scored.entry.id);
            ModelRecommendation {
                id: scored.entry.id.as_str().to_string(),
                display_name: scored.entry.display_name,
                disk_size_mb: scored.entry.disk_size.0,
                ram_required_mb: scored.entry.ram_required.0,
                description: scored.entry.description,
                score: scored.score,
                reason: scored.reason,
                is_downloaded: downloaded,
            }
        })
        .collect())
}