import type { SavedQuery, TabData } from '../types';
import { ReadSQLFile, WriteSQLFile } from '../../wailsjs/go/app/App';
import {
  getSQLFileTabPath,
  hasSQLFileTabUnsavedChanges,
  isSQLFileMissingReadResult,
  isSQLFileQueryTab,
  normalizeSQLFileReadContent,
} from './sqlFileTabDirty';
import { getQueryTabDraft, getSQLFileTabDraft } from './sqlFileTabDrafts';

type QueryResultLike = {
  success?: boolean;
  message?: string;
  data?: unknown;
};

export type ApplicationQuitUnsavedSQLTarget =
  | {
      kind: 'sql-file';
      tabId: string;
      title: string;
      filePath: string;
      draft: string;
    }
  | {
      kind: 'saved-query';
      tabId: string;
      title: string;
      savedQuery: SavedQuery;
      draft: string;
      connectionId: string;
      dbName: string;
    };

export type ReadSQLFileForQuit = (filePath: string) => Promise<QueryResultLike>;
export type WriteSQLFileForQuit = (filePath: string, content: string) => Promise<QueryResultLike>;
export type SaveQueryForQuit = (query: SavedQuery) => Promise<SavedQuery>;

const toTrimmedString = (value: unknown): string => String(value ?? '').trim();

const resolveTabTitle = (tab: TabData, fallback: string): string =>
  toTrimmedString(tab.title) || fallback;

const resolveSavedQueryForTab = (
  tab: TabData,
  savedQueries: SavedQuery[],
): SavedQuery | null => {
  if (tab.type !== 'query' || isSQLFileQueryTab(tab)) return null;
  const savedId = toTrimmedString(tab.savedQueryId) || toTrimmedString(tab.id);
  if (!savedId) return null;
  return savedQueries.find((query) => query.id === savedId) || null;
};

const hasSavedQueryUnsavedChanges = (
  tab: TabData,
  savedQuery: SavedQuery,
  draft: string,
): boolean => {
  const connectionId = toTrimmedString(tab.connectionId || savedQuery.connectionId);
  const dbName = toTrimmedString(tab.dbName || savedQuery.dbName);
  return draft !== String(savedQuery.sql ?? '')
    || connectionId !== toTrimmedString(savedQuery.connectionId)
    || dbName !== toTrimmedString(savedQuery.dbName);
};

export const buildApplicationQuitUnsavedSQLLabel = (
  targets: ApplicationQuitUnsavedSQLTarget[],
): string => {
  if (targets.length === 0) return '';
  if (targets.length === 1) return targets[0].title;
  return String(targets.length);
};

export const collectApplicationQuitUnsavedSQLTargets = async (
  tabs: TabData[],
  savedQueries: SavedQuery[],
  readSQLFile: ReadSQLFileForQuit = ReadSQLFile,
): Promise<ApplicationQuitUnsavedSQLTarget[]> => {
  const targets: ApplicationQuitUnsavedSQLTarget[] = [];

  for (const tab of tabs) {
    if (tab.type !== 'query') continue;

    if (isSQLFileQueryTab(tab)) {
      const filePath = getSQLFileTabPath(tab);
      const draft = getSQLFileTabDraft(tab.id, String(tab.query ?? ''));
      const title = resolveTabTitle(tab, filePath);
      try {
        const res = await readSQLFile(filePath);
        if (res?.success) {
          if (hasSQLFileTabUnsavedChanges({ ...tab, query: draft }, normalizeSQLFileReadContent(res.data))) {
            targets.push({ kind: 'sql-file', tabId: tab.id, title, filePath, draft });
          }
          continue;
        }
        if (isSQLFileMissingReadResult(res)) {
          targets.push({ kind: 'sql-file', tabId: tab.id, title, filePath, draft });
          continue;
        }
        throw new Error(res?.message || filePath);
      } catch {
        targets.push({ kind: 'sql-file', tabId: tab.id, title, filePath, draft });
      }
      continue;
    }

    const savedQuery = resolveSavedQueryForTab(tab, savedQueries);
    if (!savedQuery) continue;
    const draft = getQueryTabDraft(tab.id, String(tab.query ?? ''));
    if (!hasSavedQueryUnsavedChanges(tab, savedQuery, draft)) continue;
    targets.push({
      kind: 'saved-query',
      tabId: tab.id,
      title: resolveTabTitle(tab, savedQuery.name),
      savedQuery,
      draft,
      connectionId: toTrimmedString(tab.connectionId || savedQuery.connectionId),
      dbName: toTrimmedString(tab.dbName || savedQuery.dbName),
    });
  }

  return targets;
};

export const saveApplicationQuitUnsavedSQLTargets = async (
  targets: ApplicationQuitUnsavedSQLTarget[],
  saveQuery: SaveQueryForQuit,
  writeSQLFile: WriteSQLFileForQuit = WriteSQLFile,
): Promise<void> => {
  for (const target of targets) {
    if (target.kind === 'sql-file') {
      const res = await writeSQLFile(target.filePath, target.draft);
      if (!res?.success) {
        throw new Error(res?.message || target.filePath);
      }
      continue;
    }

    await saveQuery({
      ...target.savedQuery,
      sql: target.draft,
      connectionId: target.connectionId,
      dbName: target.dbName,
    });
  }
};