import {
  CreateCountrySchema,
  CreateMetroCitySchema,
  UpdateCountrySchema,
  UpdateMetroCitySchema,
} from "@capakraken/shared";
import type { Prisma } from "@capakraken/db";
import { z } from "zod";
import { findUniqueOrThrow } from "../db/helpers.js";
import { createAuditEntry } from "../lib/audit.js";
import type { TRPCContext } from "../trpc.js";
import {
  assertCountryCodeAvailable,
  assertMetroCityDeletable,
  buildCountryCreateData,
  buildCountryListWhere,
  buildCountryUpdateData,
  buildMetroCityCreateData,
  buildMetroCityUpdateData,
  findCountryByIdentifier,
} from "./country-support.js";

type CountryProcedureContext = Pick<TRPCContext, "db" | "dbUser">;

type CountryIdentifierReadModel = {
  id: string;
  code: string;
  name: string;
  isActive: boolean;
  dailyWorkingHours: number;
};

type CountryDetailReadModel = CountryIdentifierReadModel & {
  scheduleRules?: Prisma.JsonValue | null;
  metroCities: Array<{ id: string; name: string; countryId: string }>;
  _count: { resources: number };
};

function withAuditUser(userId: string | undefined) {
  return userId ? { userId } : {};
}

export const countryListInputSchema = z.object({
  isActive: z.boolean().optional(),
}).optional();

export const countryIdentifierInputSchema = z.object({
  identifier: z.string().trim().min(1),
});

export const countryIdInputSchema = z.object({
  id: z.string(),
});

export const metroCityIdInputSchema = z.object({
  id: z.string(),
});

export const countryUpdateInputSchema = z.object({
  id: z.string(),
  data: UpdateCountrySchema,
});

export const metroCityUpdateInputSchema = z.object({
  id: z.string(),
  data: UpdateMetroCitySchema,
});

type CountryListInput = z.infer<typeof countryListInputSchema>;
type CountryIdentifierInput = z.infer<typeof countryIdentifierInputSchema>;
type CountryIdInput = z.infer<typeof countryIdInputSchema>;
type CreateCountryInput = z.infer<typeof CreateCountrySchema>;
type UpdateCountryInput = z.infer<typeof countryUpdateInputSchema>;
type CreateMetroCityInput = z.infer<typeof CreateMetroCitySchema>;
type UpdateMetroCityInput = z.infer<typeof metroCityUpdateInputSchema>;
type MetroCityIdInput = z.infer<typeof metroCityIdInputSchema>;

export async function listCountries(ctx: CountryProcedureContext, input: CountryListInput) {
  return ctx.db.country.findMany({
    where: buildCountryListWhere(input ?? {}),
    include: { metroCities: { orderBy: { name: "asc" } } },
    orderBy: { name: "asc" },
  });
}

export async function resolveCountryByIdentifier(
  ctx: CountryProcedureContext,
  input: CountryIdentifierInput,
) {
  return findCountryByIdentifier<CountryIdentifierReadModel>(ctx.db, input.identifier, {
    select: {
      id: true,
      code: true,
      name: true,
      isActive: true,
      dailyWorkingHours: true,
    },
  });
}

export async function getCountryByIdentifier(
  ctx: CountryProcedureContext,
  input: CountryIdentifierInput,
) {
  return findCountryByIdentifier<CountryDetailReadModel>(ctx.db, input.identifier, {
    include: {
      metroCities: { orderBy: { name: "asc" } },
      _count: { select: { resources: true } },
    },
  });
}

export async function getCountryById(ctx: CountryProcedureContext, input: CountryIdInput) {
  return findUniqueOrThrow(
    ctx.db.country.findUnique({
      where: { id: input.id },
      include: {
        metroCities: { orderBy: { name: "asc" } },
        _count: { select: { resources: true } },
      },
    }),
    "Country",
  );
}

export async function getMetroCityById(
  ctx: CountryProcedureContext,
  input: MetroCityIdInput,
) {
  return findUniqueOrThrow(
    ctx.db.metroCity.findUnique({
      where: { id: input.id },
      select: { id: true, name: true, countryId: true },
    }),
    "Metro city",
  );
}

export async function createCountry(ctx: CountryProcedureContext, input: CreateCountryInput) {
  await assertCountryCodeAvailable(ctx.db, input.code);

  const created = await ctx.db.country.create({
    data: buildCountryCreateData(input),
    include: { metroCities: true },
  });

  void createAuditEntry({
    db: ctx.db,
    entityType: "Country",
    entityId: created.id,
    entityName: created.name,
    action: "CREATE",
    ...withAuditUser(ctx.dbUser?.id),
    after: created as unknown as Record<string, unknown>,
    source: "ui",
  });

  return created;
}

export async function updateCountry(ctx: CountryProcedureContext, input: UpdateCountryInput) {
  const existing = await findUniqueOrThrow(
    ctx.db.country.findUnique({ where: { id: input.id } }),
    "Country",
  );

  if (input.data.code && input.data.code !== existing.code) {
    await assertCountryCodeAvailable(ctx.db, input.data.code, existing.id);
  }

  const before = existing as unknown as Record<string, unknown>;

  const updated = await ctx.db.country.update({
    where: { id: input.id },
    data: buildCountryUpdateData(input.data),
    include: { metroCities: true },
  });

  void createAuditEntry({
    db: ctx.db,
    entityType: "Country",
    entityId: updated.id,
    entityName: updated.name,
    action: "UPDATE",
    ...withAuditUser(ctx.dbUser?.id),
    before,
    after: updated as unknown as Record<string, unknown>,
    source: "ui",
  });

  return updated;
}

export async function createMetroCity(ctx: CountryProcedureContext, input: CreateMetroCityInput) {
  await findUniqueOrThrow(
    ctx.db.country.findUnique({ where: { id: input.countryId } }),
    "Country",
  );

  const created = await ctx.db.metroCity.create({
    data: buildMetroCityCreateData(input),
  });

  void createAuditEntry({
    db: ctx.db,
    entityType: "MetroCity",
    entityId: created.id,
    entityName: created.name,
    action: "CREATE",
    ...withAuditUser(ctx.dbUser?.id),
    after: created as unknown as Record<string, unknown>,
    source: "ui",
  });

  return created;
}

export async function updateMetroCity(
  ctx: CountryProcedureContext,
  input: UpdateMetroCityInput,
) {
  const existing = await findUniqueOrThrow(
    ctx.db.metroCity.findUnique({ where: { id: input.id } }),
    "Metro city",
  );
  const before = existing as unknown as Record<string, unknown>;

  const updated = await ctx.db.metroCity.update({
    where: { id: input.id },
    data: buildMetroCityUpdateData(input.data),
  });

  void createAuditEntry({
    db: ctx.db,
    entityType: "MetroCity",
    entityId: updated.id,
    entityName: updated.name,
    action: "UPDATE",
    ...withAuditUser(ctx.dbUser?.id),
    before,
    after: updated as unknown as Record<string, unknown>,
    source: "ui",
  });

  return updated;
}

export async function deleteMetroCity(
  ctx: CountryProcedureContext,
  input: MetroCityIdInput,
) {
  const city = await findUniqueOrThrow(
    ctx.db.metroCity.findUnique({
      where: { id: input.id },
      include: { _count: { select: { resources: true } } },
    }),
    "Metro city",
  );
  assertMetroCityDeletable(city);
  await ctx.db.metroCity.delete({ where: { id: input.id } });

  void createAuditEntry({
    db: ctx.db,
    entityType: "MetroCity",
    entityId: city.id,
    entityName: city.name,
    action: "DELETE",
    ...withAuditUser(ctx.dbUser?.id),
    before: city as unknown as Record<string, unknown>,
    source: "ui",
  });

  return { success: true, id: city.id, name: city.name };
}