use super::build_response;
use crate::config::Config;
use crate::content_server;
use anyhow::Result;
use hyper::{Response, StatusCode};

use super::{is_valid_app_id, ApiHandler};

impl ApiHandler {
    pub(super) async fn handle_content_catalog(config: &Config) -> Result<Response<hyper::Body>> {
        match content_server::load_catalog(&config.data_dir).await {
            Ok(catalog) => {
                // Only expose public metadata for available items
                let items: Vec<serde_json::Value> = catalog
                    .items
                    .iter()
                    .filter(|i| !matches!(i.availability, content_server::Availability::Nobody))
                    .map(|i| {
                        serde_json::json!({
                            "id": i.id,
                            "filename": i.filename,
                            "mime_type": i.mime_type,
                            "size_bytes": i.size_bytes,
                            "description": i.description,
                            "access": i.access,
                        })
                    })
                    .collect();
                let body =
                    serde_json::to_vec(&serde_json::json!({ "items": items })).unwrap_or_default();
                Ok(build_response(
                    StatusCode::OK,
                    "application/json",
                    hyper::Body::from(body),
                ))
            }
            Err(e) => {
                let body = serde_json::json!({ "error": e.to_string() });
                let body_bytes = serde_json::to_vec(&body).unwrap_or_default();
                Ok(build_response(
                    StatusCode::INTERNAL_SERVER_ERROR,
                    "application/json",
                    hyper::Body::from(body_bytes),
                ))
            }
        }
    }

    pub(super) async fn handle_content_request(
        path: &str,
        headers: &hyper::HeaderMap,
        config: &Config,
    ) -> Result<Response<hyper::Body>> {
        let content_id = path.strip_prefix("/content/").unwrap_or("");
        if content_id.is_empty() || !is_valid_app_id(content_id) {
            return Ok(build_response(
                StatusCode::BAD_REQUEST,
                "text/plain",
                hyper::Body::from("Invalid content ID"),
            ));
        }

        // Extract payment token from X-Payment-Token header
        let payment_token = headers
            .get("x-payment-token")
            .and_then(|v| v.to_str().ok())
            .map(|s| s.to_string());

        // Extract federation peer DID from X-Federation-DID header
        let peer_did = headers
            .get("x-federation-did")
            .and_then(|v| v.to_str().ok())
            .map(|s| s.to_string());

        // Parse Range header for streaming support
        let range = headers
            .get("range")
            .and_then(|v| v.to_str().ok())
            .and_then(content_server::parse_range_header);

        match content_server::serve_content(
            &config.data_dir,
            content_id,
            payment_token.as_deref(),
            peer_did.as_deref(),
            range,
        )
        .await
        {
            Ok(content_server::ServeResult::Ok(bytes, mime_type)) => {
                let len = bytes.len();
                Ok(Response::builder()
                    .status(StatusCode::OK)
                    .header("Content-Type", mime_type)
                    .header("Content-Length", len.to_string())
                    .header("Accept-Ranges", "bytes")
                    .body(hyper::Body::from(bytes))
                    .unwrap())
            }
            Ok(content_server::ServeResult::Partial {
                bytes,
                mime_type,
                start,
                end,
                total,
            }) => Ok(Response::builder()
                .status(StatusCode::PARTIAL_CONTENT)
                .header("Content-Type", mime_type)
                .header("Content-Length", bytes.len().to_string())
                .header(
                    "Content-Range",
                    format!("bytes {}-{}/{}", start, end, total),
                )
                .header("Accept-Ranges", "bytes")
                .body(hyper::Body::from(bytes))
                .unwrap()),
            Ok(content_server::ServeResult::PaymentRequired(price_sats)) => {
                let body = serde_json::json!({
                    "error": "Payment required",
                    "price_sats": price_sats,
                    "payment_header": "X-Payment-Token",
                });
                let body_bytes = serde_json::to_vec(&body).unwrap_or_default();
                Ok(build_response(
                    StatusCode::PAYMENT_REQUIRED,
                    "application/json",
                    hyper::Body::from(body_bytes),
                ))
            }
            Ok(content_server::ServeResult::Forbidden) => Ok(build_response(
                StatusCode::FORBIDDEN,
                "application/json",
                hyper::Body::from(r#"{"error":"Access denied — federation peer required"}"#),
            )),
            Ok(content_server::ServeResult::NotFound) | Err(_) => Ok(build_response(
                StatusCode::NOT_FOUND,
                "text/plain",
                hyper::Body::from("Content not found"),
            )),
        }
    }

    /// Serve a degraded preview of paid content (blurred image or first 2% of video).
    pub(super) async fn handle_content_preview(
        path: &str,
        config: &Config,
    ) -> Result<Response<hyper::Body>> {
        // Path format: /content/{id}/preview
        let content_id = path
            .strip_prefix("/content/")
            .and_then(|s| s.strip_suffix("/preview"))
            .unwrap_or("");

        if content_id.is_empty() || !is_valid_app_id(content_id) {
            return Ok(build_response(
                StatusCode::BAD_REQUEST,
                "text/plain",
                hyper::Body::from("Invalid content ID"),
            ));
        }

        match content_server::serve_content_preview(&config.data_dir, content_id).await {
            Ok(content_server::PreviewResult::FullContent(bytes, mime_type)) => {
                let len = bytes.len();
                Ok(Response::builder()
                    .status(StatusCode::OK)
                    .header("Content-Type", mime_type)
                    .header("Content-Length", len.to_string())
                    .body(hyper::Body::from(bytes))
                    .unwrap())
            }
            Ok(content_server::PreviewResult::BlurPreview(bytes, mime_type)) => {
                let len = bytes.len();
                Ok(Response::builder()
                    .status(StatusCode::OK)
                    .header("Content-Type", mime_type)
                    .header("Content-Length", len.to_string())
                    .header("X-Content-Preview", "blur")
                    .body(hyper::Body::from(bytes))
                    .unwrap())
            }
            Ok(content_server::PreviewResult::TruncatedPreview(bytes, mime_type, total_size)) => {
                let len = bytes.len();
                Ok(Response::builder()
                    .status(StatusCode::OK)
                    .header("Content-Type", mime_type)
                    .header("Content-Length", len.to_string())
                    .header("X-Content-Preview", "truncated")
                    .header("X-Content-Total-Size", total_size.to_string())
                    .body(hyper::Body::from(bytes))
                    .unwrap())
            }
            Ok(content_server::PreviewResult::NotFound) | Err(_) => Ok(build_response(
                StatusCode::NOT_FOUND,
                "text/plain",
                hyper::Body::from("Preview not available"),
            )),
        }
    }
}