//! Networking profit tracking.
//!
//! Aggregates earnings from content sales (ecash) and Lightning routing fees.

use anyhow::{Context, Result};
use serde::{Deserialize, Serialize};
use std::path::Path;
use tokio::fs;
use tracing::debug;

use super::ecash;

const PROFITS_FILE: &str = "wallet/profits.json";

/// Earnings breakdown by source.
#[derive(Debug, Clone, Default, Serialize, Deserialize)]
pub struct ProfitsSummary {
    /// Total earnings in sats from all sources.
    pub total_sats: u64,
    /// Earnings from ecash content sales.
    pub content_sales_sats: u64,
    /// Earnings from Lightning routing fees.
    pub routing_fees_sats: u64,
    /// Recent earning entries (newest first).
    pub recent: Vec<ProfitEntry>,
}

/// A single profit event.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ProfitEntry {
    pub source: ProfitSource,
    pub amount_sats: u64,
    pub timestamp: String,
    #[serde(default)]
    pub description: String,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum ProfitSource {
    ContentSale,
    RoutingFee,
}

/// Load profits summary from disk.
pub async fn load_profits(data_dir: &Path) -> Result<ProfitsSummary> {
    let path = data_dir.join(PROFITS_FILE);
    if !path.exists() {
        return Ok(ProfitsSummary::default());
    }
    let content = fs::read_to_string(&path)
        .await
        .context("Failed to read profits file")?;
    let summary: ProfitsSummary = serde_json::from_str(&content).unwrap_or_default();
    Ok(summary)
}

/// Save profits summary to disk.
pub async fn save_profits(data_dir: &Path, summary: &ProfitsSummary) -> Result<()> {
    let dir = data_dir.join("wallet");
    fs::create_dir_all(&dir)
        .await
        .context("Failed to create wallet dir")?;
    let path = data_dir.join(PROFITS_FILE);
    let content =
        serde_json::to_string_pretty(summary).context("Failed to serialize profits")?;
    fs::write(&path, content)
        .await
        .context("Failed to write profits file")?;
    Ok(())
}

/// Record a content sale profit.
pub async fn record_content_sale(data_dir: &Path, amount_sats: u64, description: &str) -> Result<()> {
    let mut summary = load_profits(data_dir).await?;
    summary.total_sats += amount_sats;
    summary.content_sales_sats += amount_sats;
    summary.recent.insert(
        0,
        ProfitEntry {
            source: ProfitSource::ContentSale,
            amount_sats,
            timestamp: chrono::Utc::now().to_rfc3339(),
            description: description.to_string(),
        },
    );
    // Keep only the last 100 entries
    summary.recent.truncate(100);
    save_profits(data_dir, &summary).await?;
    debug!("Recorded content sale: {} sats", amount_sats);
    Ok(())
}

/// Compute a full profits summary including ecash receive transactions.
pub async fn get_networking_profits(data_dir: &Path) -> Result<ProfitsSummary> {
    let mut summary = load_profits(data_dir).await?;

    // Also count ecash "receive" transactions as content sales revenue
    let wallet = ecash::load_wallet(data_dir).await?;
    let ecash_received: u64 = wallet
        .transactions
        .iter()
        .filter(|tx| matches!(tx.tx_type, ecash::TransactionType::Receive))
        .map(|tx| tx.amount_sats)
        .sum();

    // Use the higher of tracked profits or ecash receives as content sales
    if ecash_received > summary.content_sales_sats {
        summary.content_sales_sats = ecash_received;
    }
    summary.total_sats = summary.content_sales_sats + summary.routing_fees_sats;

    Ok(summary)
}