import { SIDEBAR_TREE_ROW_HEIGHT, type FlatTreeNode } from "@/composables/useFlatTree";
import type { QueryTab, TreeNode } from "@/types/database";

export type ActiveTabSidebarTarget =
  | {
      type: "table";
      connectionId: string;
      database: string;
      schema?: string;
      tableName: string;
    }
  | {
      type: "mongo-collection";
      connectionId: string;
      database: string;
      collectionName: string;
    }
  | {
      type: "saved-sql-file";
      savedSqlId: string;
    };

export function activeTabSidebarTarget(tab: QueryTab | undefined | null): ActiveTabSidebarTarget | null {
  if (!tab) return null;

  if (tab.savedSqlId) {
    return { type: "saved-sql-file", savedSqlId: tab.savedSqlId };
  }

  if (tab.mode === "data") {
    const tableName = tab.tableMeta?.tableName || tab.title;
    if (!tableName) return null;
    return {
      type: "table",
      connectionId: tab.connectionId,
      database: tab.database,
      schema: tab.tableMeta?.schema ?? tab.schema,
      tableName,
    };
  }

  if (tab.mode === "mongo") {
    const collectionName = tab.sql || tab.title.split(".").pop() || tab.title;
    if (!collectionName) return null;
    return {
      type: "mongo-collection",
      connectionId: tab.connectionId,
      database: tab.database,
      collectionName,
    };
  }

  return null;
}

function schemaMatches(node: TreeNode, schema: string | undefined): boolean {
  if (!schema) return true;
  return (node.schema || "") === schema;
}

function matchesTarget(node: TreeNode, target: ActiveTabSidebarTarget): boolean {
  if (target.type === "saved-sql-file") {
    return node.type === "saved-sql-file" && node.savedSqlId === target.savedSqlId;
  }

  if (target.type === "mongo-collection") {
    return (
      node.type === "mongo-collection" &&
      node.connectionId === target.connectionId &&
      node.database === target.database &&
      node.label === target.collectionName
    );
  }

  return (
    (node.type === "table" || node.type === "view") &&
    node.connectionId === target.connectionId &&
    node.database === target.database &&
    schemaMatches(node, target.schema) &&
    node.label === target.tableName
  );
}

export function findSidebarNodeForActiveTab(
  tab: QueryTab | undefined | null,
  flatNodes: readonly FlatTreeNode[],
): FlatTreeNode | null {
  const target = activeTabSidebarTarget(tab);
  if (!target) return null;
  return flatNodes.find((item) => matchesTarget(item.node, target)) ?? null;
}

export function shouldScrollActiveSidebarSelection(options: {
  activeTabId: string | null | undefined;
  previousActiveTabId: string | null | undefined;
  autoSelectEnabled: boolean;
  previousAutoSelectEnabled: boolean | undefined;
}): boolean {
  if (!options.autoSelectEnabled) return false;
  return (
    options.activeTabId !== options.previousActiveTabId ||
    (options.autoSelectEnabled && options.previousAutoSelectEnabled === false)
  );
}

export function scrollTopForSidebarNode(options: {
  index: number;
  currentScrollTop: number;
  viewportHeight: number;
  rowHeight?: number;
}): number {
  const rowHeight = options.rowHeight ?? SIDEBAR_TREE_ROW_HEIGHT;
  if (options.index < 0 || options.viewportHeight <= 0) return options.currentScrollTop;

  const rowTop = options.index * rowHeight;
  const rowBottom = rowTop + rowHeight;
  const viewportTop = options.currentScrollTop;
  const viewportBottom = options.currentScrollTop + options.viewportHeight;

  if (rowTop < viewportTop) return rowTop;
  if (rowBottom > viewportBottom) return Math.max(0, rowBottom - options.viewportHeight);
  return options.currentScrollTop;
}