import { ADDON_IDS } from '../../addons';
import { isAddonEnabled } from '../../services/adminService';
import { isDemoUser, getCurrentUser } from '../../services/authService';
import {
  getOwnPlan,
  getActivePlan,
  getActivePlanId,
  getPlanData,
  updatePlan,
  setUserColor,
  sendInvite as sendVacayInvite,
  acceptInvite,
  declineInvite,
  cancelInvite,
  dissolvePlan,
  getAvailableUsers,
  listYears,
  addYear,
  deleteYear,
  getEntries as getVacayEntries,
  toggleEntry,
  toggleCompanyHoliday,
  getStats as getVacayStats,
  updateStats as updateVacayStats,
  addHolidayCalendar,
  updateHolidayCalendar,
  deleteHolidayCalendar,
  getCountries as getHolidayCountries,
  getHolidays,
} from '../../services/vacayService';
import { canRead, canWrite } from '../scopes';
import {
  TOOL_ANNOTATIONS_READONLY,
  TOOL_ANNOTATIONS_WRITE,
  TOOL_ANNOTATIONS_DELETE,
  TOOL_ANNOTATIONS_NON_IDEMPOTENT,
  demoDenied,
  ok,
} from './_shared';
import { McpServer } from '@modelcontextprotocol/sdk/server/mcp';

import { z } from 'zod';

export function registerVacayTools(server: McpServer, userId: number, scopes: string[] | null): void {
  const R = canRead(scopes, 'vacay');
  const W = canWrite(scopes, 'vacay');

  if (isAddonEnabled(ADDON_IDS.VACAY)) {
    if (R)
      server.registerTool(
        'get_vacay_plan',
        {
          description: "Get the current user's active vacation plan (own or joined).",
          inputSchema: {},
          annotations: TOOL_ANNOTATIONS_READONLY,
        },
        async () => {
          const plan = getPlanData(userId);
          return ok({ plan });
        },
      );

    if (W)
      server.registerTool(
        'update_vacay_plan',
        {
          description: 'Update vacation plan settings (weekends blocking, holidays, carry-over).',
          inputSchema: {
            block_weekends: z.boolean().optional(),
            holidays_enabled: z.boolean().optional(),
            holidays_region: z.string().nullable().optional(),
            company_holidays_enabled: z.boolean().optional(),
            carry_over_enabled: z.boolean().optional(),
          },
          annotations: TOOL_ANNOTATIONS_WRITE,
        },
        async ({ block_weekends, holidays_enabled, holidays_region, company_holidays_enabled, carry_over_enabled }) => {
          if (isDemoUser(userId)) return demoDenied();
          const planId = getActivePlanId(userId);
          await updatePlan(
            planId,
            { block_weekends, holidays_enabled, holidays_region, company_holidays_enabled, carry_over_enabled },
            undefined,
          );
          return ok({ success: true });
        },
      );

    if (W)
      server.registerTool(
        'set_vacay_color',
        {
          description: "Set the current user's color in the vacation plan calendar.",
          inputSchema: {
            color: z.string().describe('Hex color e.g. #6366f1'),
          },
          annotations: TOOL_ANNOTATIONS_WRITE,
        },
        async ({ color }) => {
          if (isDemoUser(userId)) return demoDenied();
          const planId = getActivePlanId(userId);
          setUserColor(userId, planId, color, undefined);
          return ok({ success: true });
        },
      );

    if (R)
      server.registerTool(
        'get_available_vacay_users',
        {
          description: 'List users who can be invited to the current vacation plan.',
          inputSchema: {},
          annotations: TOOL_ANNOTATIONS_READONLY,
        },
        async () => {
          const planId = getActivePlanId(userId);
          const users = getAvailableUsers(userId, planId);
          return ok({ users });
        },
      );

    if (W)
      server.registerTool(
        'send_vacay_invite',
        {
          description: 'Invite a user to join the vacation plan by their user ID.',
          inputSchema: {
            targetUserId: z.number().int().positive(),
          },
          annotations: TOOL_ANNOTATIONS_NON_IDEMPOTENT,
        },
        async ({ targetUserId }) => {
          if (isDemoUser(userId)) return demoDenied();
          const planId = getActivePlanId(userId);
          const me = getCurrentUser(userId);
          if (!me) return { content: [{ type: 'text' as const, text: 'User not found.' }], isError: true };
          const result = sendVacayInvite(planId, userId, me.username, me.email, targetUserId);
          if (result.error) return { content: [{ type: 'text' as const, text: result.error }], isError: true };
          return ok({ success: true });
        },
      );

    if (W)
      server.registerTool(
        'accept_vacay_invite',
        {
          description: "Accept a pending invitation to join another user's vacation plan.",
          inputSchema: {
            planId: z.number().int().positive(),
          },
          annotations: TOOL_ANNOTATIONS_NON_IDEMPOTENT,
        },
        async ({ planId }) => {
          if (isDemoUser(userId)) return demoDenied();
          const result = acceptInvite(userId, planId, undefined);
          if (result.error) return { content: [{ type: 'text' as const, text: result.error }], isError: true };
          return ok({ success: true });
        },
      );

    if (W)
      server.registerTool(
        'decline_vacay_invite',
        {
          description: 'Decline a pending vacation plan invitation.',
          inputSchema: {
            planId: z.number().int().positive(),
          },
          annotations: TOOL_ANNOTATIONS_WRITE,
        },
        async ({ planId }) => {
          declineInvite(userId, planId, undefined);
          return ok({ success: true });
        },
      );

    if (W)
      server.registerTool(
        'cancel_vacay_invite',
        {
          description: 'Cancel an outgoing invitation (owner cancels invite they sent).',
          inputSchema: {
            targetUserId: z.number().int().positive(),
          },
          annotations: TOOL_ANNOTATIONS_WRITE,
        },
        async ({ targetUserId }) => {
          if (isDemoUser(userId)) return demoDenied();
          const planId = getActivePlanId(userId);
          cancelInvite(planId, targetUserId);
          return ok({ success: true });
        },
      );

    if (W)
      server.registerTool(
        'dissolve_vacay_plan',
        {
          description:
            'Dissolve the shared plan — all members are removed and everyone returns to their own individual plan.',
          inputSchema: {},
          annotations: TOOL_ANNOTATIONS_DELETE,
        },
        async () => {
          if (isDemoUser(userId)) return demoDenied();
          dissolvePlan(userId, undefined);
          return ok({ success: true });
        },
      );

    if (R)
      server.registerTool(
        'list_vacay_years',
        {
          description: 'List calendar years tracked in the current vacation plan.',
          inputSchema: {},
          annotations: TOOL_ANNOTATIONS_READONLY,
        },
        async () => {
          const planId = getActivePlanId(userId);
          const years = listYears(planId);
          return ok({ years });
        },
      );

    if (W)
      server.registerTool(
        'add_vacay_year',
        {
          description: 'Add a calendar year to the vacation plan.',
          inputSchema: {
            year: z.number().int().min(2000).max(2100),
          },
          annotations: TOOL_ANNOTATIONS_NON_IDEMPOTENT,
        },
        async ({ year }) => {
          if (isDemoUser(userId)) return demoDenied();
          const planId = getActivePlanId(userId);
          const years = addYear(planId, year, undefined);
          return ok({ years });
        },
      );

    if (W)
      server.registerTool(
        'delete_vacay_year',
        {
          description: 'Remove a calendar year from the vacation plan.',
          inputSchema: {
            year: z.number().int(),
          },
          annotations: TOOL_ANNOTATIONS_DELETE,
        },
        async ({ year }) => {
          if (isDemoUser(userId)) return demoDenied();
          const planId = getActivePlanId(userId);
          const years = deleteYear(planId, year, undefined);
          return ok({ years });
        },
      );

    if (R)
      server.registerTool(
        'get_vacay_entries',
        {
          description: 'Get all vacation day entries for a plan and year.',
          inputSchema: {
            year: z.number().int(),
          },
          annotations: TOOL_ANNOTATIONS_READONLY,
        },
        async ({ year }) => {
          const planId = getActivePlanId(userId);
          const entries = getVacayEntries(planId, String(year));
          return ok({ entries });
        },
      );

    if (W)
      server.registerTool(
        'toggle_vacay_entry',
        {
          description: 'Toggle a day on or off as a vacation day for the current user.',
          inputSchema: {
            date: z.string().describe('ISO date YYYY-MM-DD'),
          },
          annotations: TOOL_ANNOTATIONS_NON_IDEMPOTENT,
        },
        async ({ date }) => {
          if (isDemoUser(userId)) return demoDenied();
          const planId = getActivePlanId(userId);
          const result = toggleEntry(userId, planId, date, undefined);
          return ok(result);
        },
      );

    if (W)
      server.registerTool(
        'toggle_company_holiday',
        {
          description: 'Toggle a date as a company holiday for the whole plan.',
          inputSchema: {
            date: z.string(),
            note: z.string().optional(),
          },
          annotations: TOOL_ANNOTATIONS_NON_IDEMPOTENT,
        },
        async ({ date, note }) => {
          if (isDemoUser(userId)) return demoDenied();
          const planId = getActivePlanId(userId);
          const result = toggleCompanyHoliday(planId, date, note, undefined);
          return ok(result);
        },
      );

    if (R)
      server.registerTool(
        'get_vacay_stats',
        {
          description: 'Get vacation statistics for a specific year (days used, remaining, carried over).',
          inputSchema: {
            year: z.number().int(),
          },
          annotations: TOOL_ANNOTATIONS_READONLY,
        },
        async ({ year }) => {
          const planId = getActivePlanId(userId);
          const stats = getVacayStats(planId, year);
          return ok({ stats });
        },
      );

    if (W)
      server.registerTool(
        'update_vacay_stats',
        {
          description: 'Update the vacation day allowance for a specific user and year.',
          inputSchema: {
            year: z.number().int(),
            vacationDays: z.number().int().min(0),
          },
          annotations: TOOL_ANNOTATIONS_WRITE,
        },
        async ({ year, vacationDays }) => {
          if (isDemoUser(userId)) return demoDenied();
          const planId = getActivePlanId(userId);
          updateVacayStats(userId, planId, year, vacationDays, undefined);
          return ok({ success: true });
        },
      );

    if (W)
      server.registerTool(
        'add_holiday_calendar',
        {
          description: 'Add a public holiday calendar (by region code) to the vacation plan.',
          inputSchema: {
            region: z.string().describe('Country/region code e.g. US, GB, DE'),
            label: z.string().nullable().optional(),
            color: z.string().optional(),
            sortOrder: z.number().int().optional(),
          },
          annotations: TOOL_ANNOTATIONS_NON_IDEMPOTENT,
        },
        async ({ region, label, color, sortOrder }) => {
          if (isDemoUser(userId)) return demoDenied();
          const planId = getActivePlanId(userId);
          const calendar = addHolidayCalendar(planId, region, label ?? null, color, sortOrder, undefined);
          return ok({ calendar });
        },
      );

    if (W)
      server.registerTool(
        'update_holiday_calendar',
        {
          description: 'Update label or color for a holiday calendar.',
          inputSchema: {
            calendarId: z.number().int().positive(),
            label: z.string().nullable().optional(),
            color: z.string().optional(),
          },
          annotations: TOOL_ANNOTATIONS_WRITE,
        },
        async ({ calendarId, label, color }) => {
          if (isDemoUser(userId)) return demoDenied();
          const planId = getActivePlanId(userId);
          const cal = updateHolidayCalendar(calendarId, planId, { label, color }, undefined);
          if (!cal) return { content: [{ type: 'text' as const, text: 'Holiday calendar not found.' }], isError: true };
          return ok({ calendar: cal });
        },
      );

    if (W)
      server.registerTool(
        'delete_holiday_calendar',
        {
          description: 'Remove a holiday calendar from the vacation plan.',
          inputSchema: {
            calendarId: z.number().int().positive(),
          },
          annotations: TOOL_ANNOTATIONS_DELETE,
        },
        async ({ calendarId }) => {
          if (isDemoUser(userId)) return demoDenied();
          const planId = getActivePlanId(userId);
          deleteHolidayCalendar(calendarId, planId, undefined);
          return ok({ success: true });
        },
      );

    if (R)
      server.registerTool(
        'list_holiday_countries',
        {
          description: 'List countries available for public holiday calendars.',
          inputSchema: {},
          annotations: TOOL_ANNOTATIONS_READONLY,
        },
        async () => {
          const result = await getHolidayCountries();
          if (result.error) return { content: [{ type: 'text' as const, text: result.error }], isError: true };
          return ok({ countries: result.data });
        },
      );

    if (R)
      server.registerTool(
        'list_holidays',
        {
          description: 'List public holidays for a country and year.',
          inputSchema: {
            country: z.string().describe('ISO 3166-1 alpha-2 code'),
            year: z.number().int(),
          },
          annotations: TOOL_ANNOTATIONS_READONLY,
        },
        async ({ country, year }) => {
          const result = await getHolidays(String(year), country);
          if (result.error) return { content: [{ type: 'text' as const, text: result.error }], isError: true };
          return ok({ holidays: result.data });
        },
      );
  }
}