use super::super::{build_admin_users_bad_request_response, format_optional_datetime_iso8601};
use super::support::{
    admin_user_id_from_detail_path, build_admin_user_export_payload,
    build_admin_user_payload_with_groups, find_admin_export_user,
};
use crate::handlers::admin::request::{AdminAppState, AdminRequestContext};
use crate::handlers::admin::shared::{query_param_optional_bool, query_param_value};
use crate::GatewayError;
use axum::{
    body::Body,
    http,
    response::{IntoResponse, Response},
    Json,
};
use serde_json::json;
use std::collections::BTreeMap;

pub(in super::super) async fn build_admin_list_users_response(
    state: &AdminAppState<'_>,
    request_context: &AdminRequestContext<'_>,
) -> Result<Response<Body>, GatewayError> {
    let skip = query_param_value(request_context.query_string(), "skip")
        .and_then(|value| value.parse::<usize>().ok())
        .unwrap_or(0);
    let limit = query_param_value(request_context.query_string(), "limit")
        .and_then(|value| value.parse::<usize>().ok())
        .unwrap_or(100)
        .clamp(1, 1000);
    let role = query_param_value(request_context.query_string(), "role")
        .map(|value| value.trim().to_ascii_lowercase())
        .filter(|value| !value.is_empty());
    let is_active = query_param_optional_bool(request_context.query_string(), "is_active");
    let search = query_param_value(request_context.query_string(), "search")
        .map(|value| value.trim().to_string())
        .filter(|value| !value.is_empty());
    let group_id = query_param_value(request_context.query_string(), "group_id")
        .map(|value| value.trim().to_string())
        .filter(|value| !value.is_empty());

    let sort_by = query_param_value(request_context.query_string(), "sort_by")
        .and_then(|value| aether_data::repository::users::UserExportSortBy::parse(&value))
        .unwrap_or_default();
    let sort_order = query_param_value(request_context.query_string(), "sort_order")
        .and_then(|value| aether_data::repository::users::UserExportSortOrder::parse(&value))
        .unwrap_or_default();

    let query = aether_data::repository::users::UserExportListQuery {
        skip,
        limit,
        role: role.clone(),
        is_active,
        search,
        group_id,
        sort_by,
        sort_order,
    };
    let (paged_rows_result, total_result) = tokio::join!(
        state.list_export_users_page(&query),
        state.count_export_users(&query),
    );
    let paged_rows = paged_rows_result?;
    let total = total_result?;
    let user_ids = paged_rows
        .iter()
        .map(|row| row.id.clone())
        .collect::<Vec<_>>();
    let (
        auth_rows_result,
        wallet_rows_result,
        usage_totals_result,
        memberships_result,
        groups_result,
    ) = tokio::join!(
        state.list_user_auth_by_ids(&user_ids),
        state.list_wallet_snapshots_by_user_ids(&user_ids),
        state.summarize_usage_totals_by_user_ids(&user_ids),
        state.list_user_group_memberships_by_user_ids(&user_ids),
        state.list_user_groups(),
    );
    let auth_by_user_id = auth_rows_result?
        .into_iter()
        .map(|user| (user.id.clone(), user))
        .collect::<BTreeMap<_, _>>();
    let wallet_by_user_id = wallet_rows_result?
        .into_iter()
        .filter_map(|wallet| wallet.user_id.clone().map(|user_id| (user_id, wallet)))
        .collect::<BTreeMap<_, _>>();
    let usage_totals_by_user_id = usage_totals_result?
        .into_iter()
        .map(|item| (item.user_id.clone(), item))
        .collect::<BTreeMap<_, _>>();
    let groups_by_id = groups_result?
        .into_iter()
        .map(|group| (group.id.clone(), group))
        .collect::<BTreeMap<_, _>>();
    let mut group_ids_by_user_id = BTreeMap::<String, Vec<String>>::new();
    for membership in memberships_result? {
        group_ids_by_user_id
            .entry(membership.user_id)
            .or_default()
            .push(membership.group_id);
    }

    let mut payload = Vec::with_capacity(paged_rows.len());
    for row in paged_rows {
        let auth = auth_by_user_id.get(&row.id);
        let unlimited = wallet_by_user_id
            .get(&row.id)
            .is_some_and(|wallet| wallet.limit_mode.eq_ignore_ascii_case("unlimited"));
        let usage_totals = usage_totals_by_user_id.get(&row.id);
        let groups = group_ids_by_user_id
            .get(&row.id)
            .into_iter()
            .flatten()
            .filter_map(|group_id| groups_by_id.get(group_id).cloned())
            .collect::<Vec<_>>();
        payload.push(build_admin_user_export_payload(
            &row,
            unlimited,
            auth.as_ref().and_then(|user| user.created_at),
            auth.as_ref().and_then(|user| user.last_login_at),
            usage_totals
                .map(|item| item.request_count)
                .unwrap_or_default(),
            usage_totals
                .map(|item| item.total_tokens)
                .unwrap_or_default(),
            &groups,
        ));
    }

    let has_more = (skip as u64).saturating_add(payload.len() as u64) < total;
    Ok(Json(json!({
        "items": payload,
        "total": total,
        "skip": skip,
        "limit": limit,
        "has_more": has_more,
    }))
    .into_response())
}

pub(in super::super) async fn build_admin_get_user_response(
    state: &AdminAppState<'_>,
    request_context: &AdminRequestContext<'_>,
) -> Result<Response<Body>, GatewayError> {
    let Some(user_id) = admin_user_id_from_detail_path(request_context.path()) else {
        return Ok(build_admin_users_bad_request_response("缺少 user_id"));
    };
    let Some(user) = state.find_user_auth_by_id(&user_id).await? else {
        return Ok((
            http::StatusCode::NOT_FOUND,
            Json(json!({ "detail": "用户不存在" })),
        )
            .into_response());
    };

    let wallet = state
        .find_wallet(aether_data::repository::wallet::WalletLookupKey::UserId(
            &user_id,
        ))
        .await?;
    let export_row = find_admin_export_user(state, &user_id).await?;
    let groups = state.list_user_groups_for_user(&user_id).await?;
    let unlimited = wallet
        .as_ref()
        .is_some_and(|wallet| wallet.limit_mode.eq_ignore_ascii_case("unlimited"));
    let mut payload = build_admin_user_payload_with_groups(
        &user,
        export_row.as_ref().and_then(|row| row.rate_limit),
        export_row.as_ref().map(|row| row.rate_limit_mode.as_str()),
        unlimited,
        &groups,
    );
    payload["feature_settings"] = export_row
        .as_ref()
        .and_then(|row| row.feature_settings.clone())
        .unwrap_or(serde_json::Value::Null);
    Ok(Json(payload).into_response())
}