// Oppsummerings-dispatcher — delegerer til synops-summarize CLI.
//
// Maskinrommet orkestrerer, CLI-verktøyet gjør jobben.
// Ref: docs/retninger/unix_filosofi.md
//
// Jobbtype: "summarize_communication"
// Payload: { "communication_id": "<uuid>", "requested_by": "<uuid>" }

use std::process::Stdio;
use uuid::Uuid;

use crate::jobs::JobRow;
use crate::stdb::StdbClient;

/// Synops-summarize binary path.
/// Søker i PATH, men kan overrides med SYNOPS_SUMMARIZE_BIN.
fn summarize_bin() -> String {
    std::env::var("SYNOPS_SUMMARIZE_BIN")
        .unwrap_or_else(|_| "synops-summarize".to_string())
}

/// Handler for summarize_communication-jobber.
///
/// Spawner synops-summarize med --write for å gjøre alt arbeidet:
/// LLM-kall, node-opprettelse, edge-skriving, ressurslogging.
///
/// Payload forventer:
///   - communication_id: UUID — kommunikasjonsnoden som skal oppsummeres
///   - requested_by: UUID — brukeren som utløste oppsummeringen
pub async fn handle_summarize_communication(
    job: &JobRow,
    _db: &sqlx::PgPool,
    _stdb: &StdbClient,
) -> Result<serde_json::Value, String> {
    let communication_id: Uuid = job
        .payload
        .get("communication_id")
        .and_then(|v| v.as_str())
        .and_then(|s| s.parse().ok())
        .ok_or("Mangler gyldig communication_id i payload")?;

    let requested_by: Uuid = job
        .payload
        .get("requested_by")
        .and_then(|v| v.as_str())
        .and_then(|s| s.parse().ok())
        .ok_or("Mangler gyldig requested_by i payload")?;

    // Bygg kommando
    let bin = summarize_bin();
    let mut cmd = tokio::process::Command::new(&bin);

    cmd.arg("--communication-id")
        .arg(communication_id.to_string())
        .arg("--requested-by")
        .arg(requested_by.to_string())
        .arg("--write");

    // Sett miljøvariabler CLI-verktøyet trenger
    let db_url = std::env::var("DATABASE_URL")
        .map_err(|_| "DATABASE_URL ikke satt".to_string())?;

    cmd.env("DATABASE_URL", &db_url);

    // Videresend AI-relaterte env-variabler hvis satt
    if let Ok(v) = std::env::var("AI_GATEWAY_URL") {
        cmd.env("AI_GATEWAY_URL", v);
    }
    if let Ok(v) = std::env::var("LITELLM_MASTER_KEY") {
        cmd.env("LITELLM_MASTER_KEY", v);
    }
    if let Ok(v) = std::env::var("AI_SUMMARY_MODEL") {
        cmd.env("AI_SUMMARY_MODEL", v);
    }

    cmd.stdout(Stdio::piped())
        .stderr(Stdio::piped());

    tracing::info!(
        communication_id = %communication_id,
        requested_by = %requested_by,
        bin = %bin,
        "Starter synops-summarize"
    );

    // Spawn og vent
    let child = cmd
        .spawn()
        .map_err(|e| format!("Kunne ikke starte {bin}: {e}"))?;
    let output = child
        .wait_with_output()
        .await
        .map_err(|e| format!("Feil ved kjøring av {bin}: {e}"))?;

    let stderr = String::from_utf8_lossy(&output.stderr);
    if !stderr.is_empty() {
        tracing::info!(stderr = %stderr, "synops-summarize stderr");
    }

    if !output.status.success() {
        let code = output.status.code().unwrap_or(-1);
        return Err(format!(
            "synops-summarize feilet (exit {code}): {stderr}"
        ));
    }

    // Parse stdout som JSON — det er resultatet
    let stdout = String::from_utf8_lossy(&output.stdout);
    let result: serde_json::Value = serde_json::from_str(&stdout)
        .map_err(|e| format!("Kunne ikke parse synops-summarize output: {e}"))?;

    tracing::info!(
        communication_id = %communication_id,
        summary_node_id = result["summary_node_id"].as_str().unwrap_or("n/a"),
        status = result["status"].as_str().unwrap_or("unknown"),
        "synops-summarize fullført"
    );

    Ok(result)
}