import { db } from '../db';
import {
  formFields,
  formStatuses,
  tasks,
  taskFieldValues,
  type Task,
  type FormField,
  type FormStatus,
} from '@shared/schema';
import { eq, and, sql, isNull } from 'drizzle-orm';
import { storage } from '../storage';
import { VPN_FORM_ID } from './vpn.config';

export interface VpnFormCache {
  fields: FormField[];
  statuses: FormStatus[];
  fieldByCode: Map<string, FormField>;
  statusByName: Map<string, FormStatus>;
}

const cacheByOrg = new Map<number, VpnFormCache>();

export async function getVpnFormCache(organizationId: number): Promise<VpnFormCache> {
  if (cacheByOrg.has(organizationId)) {
    return cacheByOrg.get(organizationId)!;
  }

  const [fields, statuses] = await Promise.all([
    db
      .select()
      .from(formFields)
      .where(and(eq(formFields.formId, VPN_FORM_ID), isNull(formFields.deletedAt)))
      .then(rows => rows as FormField[]),
    db
      .select()
      .from(formStatuses)
      .where(eq(formStatuses.formId, VPN_FORM_ID))
      .then(rows => rows as FormStatus[]),
  ]);

  const cache: VpnFormCache = {
    fields,
    statuses,
    fieldByCode: new Map(fields.map(f => [f.code, f])),
    statusByName: new Map(statuses.map(s => [s.name, s])),
  };
  cacheByOrg.set(organizationId, cache);
  return cache;
}

export function getFieldId(cache: VpnFormCache, code: string): number {
  const f = cache.fieldByCode.get(code);
  if (!f) throw new Error(`VPN field not found: ${code}`);
  return f.id;
}

export function getStatusId(cache: VpnFormCache, name: string): number {
  const s = cache.statusByName.get(name);
  if (!s) throw new Error(`VPN status not found: ${name}`);
  return s.id;
}

export function clearVpnFormCache(organizationId: number): void {
  cacheByOrg.delete(organizationId);
}

export interface VpnTaskData {
  task: Task;
  values: Record<string, unknown>;
}

export async function findVpnTaskByToken(
  token: string,
  organizationId: number,
): Promise<VpnTaskData | null> {
  const cache = await getVpnFormCache(organizationId);
  const fieldId = getFieldId(cache, 'subscription_token');

  const rows = await db
    .select({ task: tasks, value: taskFieldValues.value })
    .from(taskFieldValues)
    .innerJoin(tasks, eq(taskFieldValues.taskId, tasks.id))
    .where(
      and(
        eq(taskFieldValues.fieldId, fieldId),
        eq(taskFieldValues.formId, VPN_FORM_ID),
        sql`${taskFieldValues.value} = to_jsonb(${token}::text)`,
        eq(tasks.organizationId, organizationId),
      ),
    )
    .limit(1);

  if (!rows.length) return null;
  return loadVpnTaskValues(rows[0].task.id, organizationId);
}

export async function findVpnTaskByRoomUrl(
  roomUrl: string,
  organizationId: number,
): Promise<VpnTaskData | null> {
  const cache = await getVpnFormCache(organizationId);
  const fieldId = getFieldId(cache, 'room_url');

  const rows = await db
    .select({ task: tasks })
    .from(taskFieldValues)
    .innerJoin(tasks, eq(taskFieldValues.taskId, tasks.id))
    .where(
      and(
        eq(taskFieldValues.fieldId, fieldId),
        eq(taskFieldValues.formId, VPN_FORM_ID),
        sql`${taskFieldValues.value} = to_jsonb(${roomUrl}::text)`,
        eq(tasks.organizationId, organizationId),
      ),
    )
    .limit(1);

  if (!rows.length) return null;
  return loadVpnTaskValues(rows[0].task.id, organizationId);
}

export async function findVpnTaskByRoomAndDevice(
  roomUrl: string,
  deviceId: string,
  organizationId: number,
): Promise<VpnTaskData | null> {
  const cache = await getVpnFormCache(organizationId);
  const roomFieldId = getFieldId(cache, 'room_url');

  const rows = await db
    .select({ task: tasks })
    .from(taskFieldValues)
    .innerJoin(tasks, eq(taskFieldValues.taskId, tasks.id))
    .where(
      and(
        eq(taskFieldValues.fieldId, roomFieldId),
        eq(taskFieldValues.formId, VPN_FORM_ID),
        sql`${taskFieldValues.value} = to_jsonb(${roomUrl}::text)`,
        eq(tasks.organizationId, organizationId),
      ),
    )
    .limit(1);

  if (!rows.length) return null;
  const data = await loadVpnTaskValues(rows[0].task.id, organizationId);
  if (data.values.hwid !== deviceId) return null;
  return data;
}

export async function findVpnTaskByRoomAndSession(
  roomUrl: string,
  sessionId: string,
  organizationId: number,
): Promise<VpnTaskData | null> {
  const cache = await getVpnFormCache(organizationId);
  const roomFieldId = getFieldId(cache, 'room_url');

  const rows = await db
    .select({ task: tasks })
    .from(taskFieldValues)
    .innerJoin(tasks, eq(taskFieldValues.taskId, tasks.id))
    .where(
      and(
        eq(taskFieldValues.fieldId, roomFieldId),
        eq(taskFieldValues.formId, VPN_FORM_ID),
        sql`${taskFieldValues.value} = to_jsonb(${roomUrl}::text)`,
        eq(tasks.organizationId, organizationId),
      ),
    )
    .limit(1);

  if (!rows.length) return null;
  const data = await loadVpnTaskValues(rows[0].task.id, organizationId);
  if (data.values.active_session_id !== sessionId) return null;
  return data;
}

export async function loadVpnTaskValues(
  taskId: number,
  organizationId: number,
): Promise<VpnTaskData> {
  const cache = await getVpnFormCache(organizationId);
  const [task, fvs] = await Promise.all([
    storage.getTask(taskId, organizationId),
    storage.getTaskFieldValues(taskId, organizationId),
  ]);
  if (!task) throw new Error(`VPN task not found: ${taskId}`);

  const values: Record<string, unknown> = {};
  for (const fv of fvs) {
    const field = cache.fields.find(f => f.id === fv.fieldId);
    if (field) {
      values[field.code] = fv.value;
    }
  }
  return { task, values };
}

export async function setVpnTaskField(
  taskId: number,
  fieldCode: string,
  value: unknown,
  organizationId: number,
): Promise<void> {
  const cache = await getVpnFormCache(organizationId);
  const fieldId = getFieldId(cache, fieldCode);

  const existing = await db
    .select({ id: taskFieldValues.id })
    .from(taskFieldValues)
    .where(and(eq(taskFieldValues.taskId, taskId), eq(taskFieldValues.fieldId, fieldId)))
    .limit(1);

  if (existing.length) {
    await storage.updateTaskFieldValue(taskId, fieldId, organizationId, { value: value as any });
  } else {
    await storage.createTaskFieldValue({
      taskId,
      fieldId,
      formId: VPN_FORM_ID,
      value: value as any,
    });
  }
}

export async function setVpnTaskStatus(
  taskId: number,
  statusName: string,
  organizationId: number,
): Promise<void> {
  const cache = await getVpnFormCache(organizationId);
  const statusId = getStatusId(cache, statusName);
  const status = cache.statusByName.get(statusName)!;
  await storage.updateTask(taskId, organizationId, {
    currentStatusId: statusId,
    isCompleted: status.isFinal,
  });
}

export async function createVpnTask(
  input: {
    organizationId: number;
    createdBy: number;
    title: string;
    statusName: string;
    fields: Record<string, unknown>;
  },
): Promise<Task> {
  const cache = await getVpnFormCache(input.organizationId);
  const statusId = getStatusId(cache, input.statusName);

  return db.transaction(async (tx) => {
    const [task] = await tx
      .insert(tasks)
      .values({
        organizationId: input.organizationId,
        formId: VPN_FORM_ID,
        title: input.title,
        currentStatusId: statusId,
        createdBy: input.createdBy,
        isCompleted: false,
      })
      .returning();

    const fieldInserts = Object.entries(input.fields)
      .filter(([, value]) => value !== undefined && value !== null)
      .map(([code, value]) => ({
        taskId: task.id,
        fieldId: getFieldId(cache, code),
        formId: VPN_FORM_ID,
        value: value as any,
      }));

    if (fieldInserts.length > 0) {
      await tx.insert(taskFieldValues).values(fieldInserts);
    }

    return task;
  });
}

export async function updateVpnTaskFieldMap(
  taskId: number,
  organizationId: number,
  fields: Record<string, unknown>,
): Promise<void> {
  for (const [code, value] of Object.entries(fields)) {
    if (value === undefined) continue;
    await setVpnTaskField(taskId, code, value, organizationId);
  }
}

export interface ActiveVpnTaskInfo {
  taskId: number;
  organizationId: number;
  createdBy: number;
  roomUrl: string;
}

export async function findAllActiveVpnTasks(): Promise<ActiveVpnTaskInfo[]> {
  // Find all organizations that have VPN tasks
  const orgRows = await db
    .select({ orgId: tasks.organizationId })
    .from(tasks)
    .where(eq(tasks.formId, VPN_FORM_ID))
    .groupBy(tasks.organizationId);

  const results: ActiveVpnTaskInfo[] = [];

  for (const { orgId } of orgRows) {
    try {
      const cache = await getVpnFormCache(orgId);
      const statusFieldId = getFieldId(cache, 'status');
      const activeFieldId = getFieldId(cache, 'is_active');
      const roomUrlFieldId = getFieldId(cache, 'room_url');

      const rows = await db
        .select({
          taskId: tasks.id,
          createdBy: tasks.createdBy,
          roomUrl: taskFieldValues.value,
        })
        .from(tasks)
        .innerJoin(
          taskFieldValues,
          and(
            eq(taskFieldValues.taskId, tasks.id),
            eq(taskFieldValues.formId, VPN_FORM_ID),
            eq(taskFieldValues.fieldId, roomUrlFieldId),
          ),
        )
        .where(
          and(
            eq(tasks.formId, VPN_FORM_ID),
            eq(tasks.organizationId, orgId),
            sql`exists (
              select 1 from task_field_values tfv
              where tfv.task_id = tasks.id
                and tfv.field_id = ${statusFieldId}
                and tfv.value = to_jsonb('Активна'::text)
            )`,
            sql`exists (
              select 1 from task_field_values tfv
              where tfv.task_id = tasks.id
                and tfv.field_id = ${activeFieldId}
                and tfv.value = to_jsonb(true)
            )`,
          ),
        );

      for (const row of rows) {
        if (typeof row.roomUrl === 'string' && row.roomUrl) {
          results.push({
            taskId: row.taskId,
            organizationId: orgId,
            createdBy: row.createdBy,
            roomUrl: row.roomUrl,
          });
        }
      }
    } catch (err) {
      console.error(`[VPN DB] findAllActiveVpnTasks error for org ${orgId}:`, err);
    }
  }

  return results;
}