use actix_web::{web, App, HttpServer, HttpResponse, HttpRequest, middleware::Logger};
use serde_json::json;
use std::sync::Mutex;
use std::time::Instant;
use anyhow::Result;
use crate::endpoints::{IngestQueue, IngestRequest};

/// Server state.
pub struct AppState {
    pub api_key: String,
    pub start_time: Instant,
    pub queue: Mutex<IngestQueue>,
}

/// Auth extractor — validates apikey header.
fn check_auth(req: &HttpRequest, state: &AppState) -> Result<(), HttpResponse> {
    let api_key = req
        .headers()
        .get("apikey")
        .and_then(|h| h.to_str().ok())
        .map(|s| s.to_string());

    if api_key.as_ref() != Some(&state.api_key) {
        return Err(HttpResponse::Unauthorized()
            .json(json!({"error": "unauthorized", "reason": "missing apikey header"})));
    }
    Ok(())
}

/// Start HTTP server.
pub async fn start_server(port: u16, api_key: String) -> Result<()> {
    let state = web::Data::new(AppState {
        api_key,
        start_time: Instant::now(),
        queue: Mutex::new(IngestQueue::new()),
    });

    HttpServer::new(move || {
        App::new()
            .app_data(state.clone())
            .wrap(Logger::default())
            .route("/health", web::get().to(health_check))
            .route("/memory/ingest", web::post().to(ingest_handler))
            .route("/memory/ingest/{job_id}", web::get().to(ingest_status))
            .route("/memory/query", web::get().to(query_handler))
            .route("/memory/skills", web::get().to(skills_handler))
            .route("/memory/skills/{name}", web::get().to(skill_detail))
            .route("/memory/projects", web::get().to(projects_handler))
            .route("/memory/projects/{id}/status", web::get().to(project_status))
    })
    .bind(("127.0.0.1", port))?
    .run()
    .await?;

    Ok(())
}

/// Health check endpoint (no auth required).
pub async fn health_check(state: web::Data<AppState>) -> HttpResponse {
    let uptime = state.start_time.elapsed().as_secs();
    HttpResponse::Ok()
        .json(json!({"status": "ok", "uptime_seconds": uptime}))
}

/// POST /memory/ingest
pub async fn ingest_handler(
    req: HttpRequest,
    body: web::Json<IngestRequest>,
    state: web::Data<AppState>,
) -> HttpResponse {
    if let Err(e) = check_auth(&req, &state) {
        return e;
    }

    let mut q = state.queue.lock().unwrap();
    let (job_id, _) = q.submit(&body.project, &body.ingest_id);

    HttpResponse::Accepted().json(json!({
        "job_id": job_id,
        "ingest_id": body.ingest_id,
        "status_url": format!("/memory/ingest/{}", job_id),
        "estimated_wait_seconds": 15
    }))
}

/// GET /memory/ingest/{job_id}
pub async fn ingest_status(
    req: HttpRequest,
    job_id: web::Path<String>,
    state: web::Data<AppState>,
) -> HttpResponse {
    if let Err(e) = check_auth(&req, &state) {
        return e;
    }

    let q = state.queue.lock().unwrap();
    match q.get_status(&job_id) {
        Some(status) => HttpResponse::Ok().json(status),
        None => HttpResponse::NotFound().json(json!({"error": "job not found"})),
    }
}

/// GET /memory/query
pub async fn query_handler(
    req: HttpRequest,
    state: web::Data<AppState>,
) -> HttpResponse {
    if let Err(e) = check_auth(&req, &state) {
        return e;
    }

    HttpResponse::Ok().json(json!({
        "results": [{
            "level": "L1",
            "score": 0.95,
            "text": "Infrastructure root causes",
            "provenance": ["pi-2026-07-21-xyz"]
        }]
    }))
}

/// GET /memory/skills
pub async fn skills_handler(
    req: HttpRequest,
    state: web::Data<AppState>,
) -> HttpResponse {
    if let Err(e) = check_auth(&req, &state) {
        return e;
    }

    HttpResponse::Ok().json(json!({
        "skills": [
            {"name": "infrastructure", "queries": 3},
            {"name": "errors", "queries": 5}
        ]
    }))
}

/// GET /memory/skills/{name}
pub async fn skill_detail(
    req: HttpRequest,
    name: web::Path<String>,
    state: web::Data<AppState>,
) -> HttpResponse {
    if let Err(e) = check_auth(&req, &state) {
        return e;
    }

    HttpResponse::Ok().json(json!({
        "name": name.into_inner(),
        "description": "Skill details",
        "related_queries": 3
    }))
}

/// GET /memory/projects
pub async fn projects_handler(
    req: HttpRequest,
    state: web::Data<AppState>,
) -> HttpResponse {
    if let Err(e) = check_auth(&req, &state) {
        return e;
    }

    HttpResponse::Ok().json(json!({
        "projects": [
            {"id": "poimen", "status": "healthy", "memories": 147}
        ]
    }))
}

/// GET /memory/projects/{id}/status
pub async fn project_status(
    req: HttpRequest,
    id: web::Path<String>,
    state: web::Data<AppState>,
) -> HttpResponse {
    if let Err(e) = check_auth(&req, &state) {
        return e;
    }

    HttpResponse::Ok().json(json!({
        "project": id.into_inner(),
        "status": "healthy",
        "l0_chunks": 412,
        "l1_memories": 17,
        "l2_synthesis": 1
    }))
}