import { UniqueID } from "@repo/rdx-ddd";
import { z } from "zod/v4";

import { Resource } from "../../domain/resource.aggregate";
import { ResourceCatalogError } from "../../domain/resource-definition";
import { ResourceRevision } from "../../domain/resource-revision.entity";
import type { ResourceOwnership } from "../../domain/resource-scope";
import { ResourceOwnershipSchema } from "../../domain/resource-scope";
import { ResourceInputSchema, ResourceSpecificationSchema } from "../../domain/resource-values";
import {
  ResourceSpecification,
  ResourceValues,
} from "../../domain/value-objects/resource-values.vo";

import type { InventoryRow, RevisionRow } from "./resource-inventory-relational";

export function inventoryIdentity(value: string) {
  const parsed = UniqueID.create(value);

  if (!parsed.isSuccess) {
    throw new Error("Identidad de recurso persistida inconsistente.");
  }

  return parsed.data;
}

export type ScopedInventoryRow = Omit<InventoryRow, "companyId"> & ResourceOwnership;

/** Único fallback legacy, reservado al origen de persistencia conocido. */
export function readResourceOwnership(row: { companyId: unknown }, mode: "legacy" | "scoped") {
  const scope: unknown =
    mode === "legacy" && !Object.hasOwn(row, "scope") ? "company" : Reflect.get(row, "scope");
  const parsed = ResourceOwnershipSchema.safeParse({ scope, companyId: row.companyId });

  if (!parsed.success) {
    throw new ResourceCatalogError("INVALID_RESOURCE_SCOPE");
  }

  return parsed.data;
}

export class ResourcePersistenceMapper {
  /** Entrada de la tabla legacy conocida: solo aquí se admite la ausencia de scope. */
  toDomain(row: InventoryRow, revisions: readonly RevisionRow[]) {
    return this.read(row, revisions, readResourceOwnership(row, "legacy"));
  }

  toScopedDomain(row: ScopedInventoryRow | InventoryRow, revisions: readonly RevisionRow[]) {
    return this.read(row, revisions, readResourceOwnership(row, "scoped"));
  }

  private read(
    row: Omit<InventoryRow, "companyId">,
    revisions: readonly RevisionRow[],
    ownership: ResourceOwnership
  ) {
    const owner =
      ownership.scope === "company"
        ? { scope: ownership.scope, companyId: inventoryIdentity(ownership.companyId) }
        : { scope: ownership.scope, companyId: null };

    const specification = ResourceSpecification.create(
      ResourceSpecificationSchema.parse(row.specification)
    );

    if (!specification.isSuccess) {
      throw new Error("Especificación de recurso persistida inconsistente.");
    }
    const values = ResourceValues.reconstruct(
      ResourceInputSchema.parse(row.values),
      specification.data
    );

    if (!values.isSuccess) {
      throw new Error("Valores de recurso persistidos inconsistentes.");
    }
    const current = values.data.toPrimitive();

    if (row.templateId !== current.templateId) {
      throw new Error("Referencia de recurso persistida inconsistente.");
    }
    const ordered = [...revisions].sort((a, b) => a.position - b.position);
    const history = ordered.map((revision, position) => {
      const revisionSpecification = ResourceSpecification.create(
        ResourceSpecificationSchema.parse(revision.specification ?? row.specification)
      );

      if (!revisionSpecification.isSuccess) {
        throw new Error("Especificación histórica inconsistente.");
      }
      const previous = ResourceValues.reconstruct(
        ResourceInputSchema.parse(revision.values),
        revisionSpecification.data
      );

      if (
        !previous.isSuccess ||
        revision.position !== position ||
        (position > 0 && revision.recordedAt < (ordered[position - 1]?.recordedAt ?? "")) ||
        !z.iso.datetime().safeParse(revision.recordedAt).success
      ) {
        throw new Error("Historial de recurso persistido inconsistente.");
      }
      if (revision.resourceId !== row.id) {
        throw new Error("Revisión fuera del recurso.");
      }

      return ResourceRevision.rehydrate(
        {
          values: previous.data,
          specification: revisionSpecification.data,
          actorId: inventoryIdentity(revision.actorId),
          recordedAt: revision.recordedAt,
        },
        inventoryIdentity(revision.id)
      );
    });

    if (!(history.length && history.at(-1)?.values.equals(values.data))) {
      throw new Error("Última revisión de recurso inconsistente.");
    }

    return Resource.rehydrate(
      {
        ...owner,
        specification: specification.data,
        values: values.data,
        history,
      },
      inventoryIdentity(row.id)
    );
  }

  toScopedPersistence(resource: Resource) {
    const saved = this.toPersistence(resource);

    return { ...saved, resource: { ...saved.resource, scope: "company" as const } };
  }

  toPersistence(resource: Resource) {
    const values = resource.values.toPrimitive();

    return {
      resource: {
        id: resource.id.toPrimitive(),
        companyId: resource.requireCompanyId().toPrimitive(),
        templateId: values.templateId,
        specification: resource.specification.toPrimitive(),
        values,
      },
      revisions: this.revisions(resource),
    };
  }

  toGlobalPersistence(resource: Resource) {
    if (
      resource.scope !== "global" ||
      resource.companyId !== null ||
      resource.values.toPrimitive().integration
    ) {
      throw new ResourceCatalogError("RESOURCE_SCOPE_UNSUPPORTED");
    }

    return {
      resource: {
        id: resource.id.toPrimitive(),
        scope: "global" as const,
        companyId: null,
        templateId: resource.values.toPrimitive().templateId,
        specification: resource.specification.toPrimitive(),
        values: resource.values.toPrimitive(),
      },
      revisions: this.revisions(resource),
    };
  }

  private revisions(resource: Resource) {
    return resource.history.map((revision, position) => ({
      id: revision.id.toPrimitive(),
      resourceId: resource.id.toPrimitive(),
      actorId: revision.actorId.toPrimitive(),
      recordedAt: revision.recordedAt,
      values: revision.values.toPrimitive(),
      specification: revision.specification.toPrimitive(),
      position,
    }));
  }
}