use axum::{
    extract::{Path, State},
    http::HeaderMap,
    http::StatusCode,
    response::{Html, IntoResponse, Json},
};
use serde_json::json;

use crate::server::AppState;

// === Admin Auth Helper ===

fn verify_admin_or_401(
    state: &AppState,
    headers: &HeaderMap,
) -> Result<(), impl IntoResponse> {
    let auth_header = headers
        .get("Authorization")
        .and_then(|v| v.to_str().ok())
        .and_then(|v| v.strip_prefix("Bearer "));

    match auth_header {
        Some(token) if state.auth.verify_admin_token(token).is_some() => Ok(()),
        _ => Err((
            StatusCode::UNAUTHORIZED,
            Json(json!({"ok": false, "error": "Invalid admin token"})),
        )),
    }
}

// === Admin Authentication Handlers ===

pub async fn admin_login_handler(
    State(state): State<AppState>,
    Json(body): Json<crate::auth::AdminLoginRequest>,
) -> impl IntoResponse {
    match state.auth.admin_login(&body.username, &body.password) {
        Some(response) => (StatusCode::OK, Json(response)).into_response(),
        None => (
            StatusCode::UNAUTHORIZED,
            Json(json!({"error": "Invalid admin credentials"})),
        )
            .into_response(),
    }
}

pub async fn admin_verify_handler(
    State(state): State<AppState>,
    headers: HeaderMap,
) -> impl IntoResponse {
    let auth_header = headers
        .get("Authorization")
        .and_then(|v| v.to_str().ok())
        .and_then(|v| v.strip_prefix("Bearer "));

    if let Some(token) = auth_header {
        if let Some(session) = state.auth.verify_admin_token(token) {
            return (
                StatusCode::OK,
                Json(json!({
                    "ok": true,
                    "username": session.username,
                    "expires_at": session.expires_at
                })),
            )
                .into_response();
        }
    }

    (
        StatusCode::UNAUTHORIZED,
        Json(json!({"ok": false, "error": "Invalid admin token"})),
    )
        .into_response()
}

// === Admin Page Handlers ===

pub async fn admin_products_page(
    State(state): State<AppState>,
    headers: HeaderMap,
) -> impl IntoResponse {
    if let Err(resp) = verify_admin_or_401(&state, &headers) {
        return resp.into_response();
    }
    Html(include_str!("../product_manager.html")).into_response()
}

pub async fn admin_files_page(
    State(state): State<AppState>,
    headers: HeaderMap,
) -> impl IntoResponse {
    if let Err(resp) = verify_admin_or_401(&state, &headers) {
        return resp.into_response();
    }
    Html(include_str!("../file_list.html")).into_response()
}

pub async fn admin_upload_page(
    State(state): State<AppState>,
    headers: HeaderMap,
) -> impl IntoResponse {
    if let Err(resp) = verify_admin_or_401(&state, &headers) {
        return resp.into_response();
    }
    Html(include_str!("../upload.html")).into_response()
}

// === Admin-Wrapped Product/File API Handlers ===

pub async fn admin_list_all_products(
    State(state): State<AppState>,
    headers: HeaderMap,
) -> axum::response::Response {
    if let Err(resp) = verify_admin_or_401(&state, &headers) {
        return resp.into_response();
    }
    crate::download::product_handlers::list_all_products(State(state))
        .await
        .into_response()
}

pub async fn admin_create_product(
    State(state): State<AppState>,
    headers: HeaderMap,
    Json(payload): Json<serde_json::Value>,
) -> axum::response::Response {
    if let Err(resp) = verify_admin_or_401(&state, &headers) {
        return resp.into_response();
    }
    crate::download::product_handlers::create_product_handler(State(state), Json(payload))
        .await
        .into_response()
}

pub async fn admin_get_series_stats(
    State(state): State<AppState>,
    headers: HeaderMap,
) -> axum::response::Response {
    if let Err(resp) = verify_admin_or_401(&state, &headers) {
        return resp.into_response();
    }
    crate::download::product_handlers::get_series_stats(State(state))
        .await
        .into_response()
}

pub async fn admin_get_product_files(
    State(state): State<AppState>,
    headers: HeaderMap,
    Path(product_id): Path<i64>,
) -> axum::response::Response {
    if let Err(resp) = verify_admin_or_401(&state, &headers) {
        return resp.into_response();
    }
    crate::download::product_handlers::get_product_files(Path(product_id), State(state))
        .await
        .into_response()
}

pub async fn admin_delete_product(
    State(state): State<AppState>,
    headers: HeaderMap,
    Path(product_id): Path<i64>,
) -> axum::response::Response {
    if let Err(resp) = verify_admin_or_401(&state, &headers) {
        return resp.into_response();
    }
    crate::download::product_handlers::delete_product(Path(product_id), State(state))
        .await
        .into_response()
}

pub async fn admin_assign_files(
    State(state): State<AppState>,
    headers: HeaderMap,
    Path(product_id): Path<i64>,
    Json(payload): Json<serde_json::Value>,
) -> axum::response::Response {
    if let Err(resp) = verify_admin_or_401(&state, &headers) {
        return resp.into_response();
    }
    crate::download::product_handlers::assign_files_to_product(
        Path(product_id),
        State(state),
        Json(payload),
    )
    .await
    .into_response()
}

pub async fn admin_list_uploaded_files(
    State(state): State<AppState>,
    headers: HeaderMap,
    Path(user_id): Path<String>,
) -> axum::response::Response {
    if let Err(resp) = verify_admin_or_401(&state, &headers) {
        return resp.into_response();
    }
    crate::download::handlers::list_uploaded_files(Path(user_id))
        .await
        .into_response()
}

// === Sync Handlers ===

pub async fn manual_sync_handler(
    State(state): State<AppState>,
    headers: HeaderMap,
) -> impl IntoResponse {
    if let Err(resp) = verify_admin_or_401(&state, &headers) {
        return resp.into_response();
    }
    let syncer = crate::pg_client::SftpGoSync::new(&state.auth_db_path);

    match syncer {
        Ok(syncer) => match syncer.full_sync().await {
            Ok(result) => {
                if result.status == "success" {
                    (
                        StatusCode::OK,
                        Json(json!({
                            "status": "success",
                            "users_synced": result.users_synced,
                            "groups_synced": result.groups_synced,
                            "mappings_synced": result.mappings_synced
                        })),
                    )
                        .into_response()
                } else if result.status == "partial_success" {
                    (
                        StatusCode::OK,
                        Json(json!({
                            "status": "partial_success",
                            "users_synced": result.users_synced,
                            "users_failed": result.users_failed,
                            "groups_synced": result.groups_synced,
                            "groups_failed": result.groups_failed,
                            "errors": result.errors
                        })),
                    )
                        .into_response()
                } else {
                    (
                        StatusCode::OK,
                        Json(json!({
                            "status": result.status,
                            "errors": result.errors
                        })),
                    )
                        .into_response()
                }
            }
            Err(e) => (
                StatusCode::INTERNAL_SERVER_ERROR,
                Json(json!({
                    "status": "failed",
                    "error": e.to_string()
                })),
            )
                .into_response(),
        },
        Err(e) => (
            StatusCode::INTERNAL_SERVER_ERROR,
            Json(json!({
                "status": "failed",
                "error": e.to_string()
            })),
        )
            .into_response(),
    }
}

pub async fn sync_status_handler(
    State(state): State<AppState>,
    headers: HeaderMap,
) -> impl IntoResponse {
    if let Err(resp) = verify_admin_or_401(&state, &headers) {
        return resp.into_response();
    }
    let auth_db = crate::sync::AuthDb::new(&state.auth_db_path);

    match auth_db {
        Ok(db) => match db.open() {
            Ok(conn) => {
                match conn.query_row(
                    "SELECT sync_type, sync_time, users_synced, users_failed,
                                groups_synced, groups_failed, mappings_synced, status
                         FROM sync_log ORDER BY sync_time DESC LIMIT 5",
                    [],
                    |row| {
                        Ok(json!({
                            "sync_type": row.get::<_, String>(0)?,
                            "sync_time": row.get::<_, i64>(1)?,
                            "users_synced": row.get::<_, usize>(2)?,
                            "users_failed": row.get::<_, usize>(3)?,
                            "groups_synced": row.get::<_, usize>(4)?,
                            "groups_failed": row.get::<_, usize>(5)?,
                            "mappings_synced": row.get::<_, usize>(6)?,
                            "status": row.get::<_, String>(7)?,
                        }))
                    },
                ) {
                    Ok(entries) => (StatusCode::OK, Json(entries)).into_response(),
                    Err(e) => (
                        StatusCode::INTERNAL_SERVER_ERROR,
                        Json(json!({"error": e.to_string()})),
                    )
                        .into_response(),
                }
            }
            Err(e) => (
                StatusCode::INTERNAL_SERVER_ERROR,
                Json(json!({"error": e.to_string()})),
            )
                .into_response(),
        },
        Err(e) => (
            StatusCode::INTERNAL_SERVER_ERROR,
            Json(json!({"error": e.to_string()})),
        )
            .into_response(),
    }
}