import type { UniqueID } from "@repo/rdx-ddd";
import { Maybe, Result } from "@repo/rdx-utils";
import type { Sequelize, Transaction } from "sequelize";
import { QueryTypes } from "sequelize";
import { z } from "zod/v4";

import type { ListGlobalApplicationHistoryRequestDTO } from "../../../common";
import {
  GlobalResourceAdminSchema,
  ListGlobalApplicationHistoryResponseSchema,
  ResourceOwnershipSchema,
} from "../../../common";
import type { IGlobalResourceRepository } from "../../application/global-resource.repository";
import { captureGlobalResourceSpecification } from "../../application/global-resource-specification";
import {
  readOperatingSystemIdentity,
  validateOperatingSystemIdentity,
} from "../../application/operating-system-identity-policy";
import {
  completeOperatingSystemIdentity,
  sameOperatingSystemIdentity,
} from "../../domain/operating-system-identity";
import type { Resource } from "../../domain/resource.aggregate";
import type { ResourceCatalog } from "../../domain/resource-catalog.aggregate";
import { ResourceCatalogError } from "../../domain/resource-definition";
import type { ResourceInput } from "../../domain/resource-values";

import { ResourceBindingModel, ResourceCatalogModel } from "./resource-catalog.model";
import { ResourceCatalogPersistenceMapper } from "./resource-catalog-persistence.mapper";
import { readDefinitions } from "./resource-catalog-relational";
import { readInventoryByIds, writeGlobalInventory } from "./resource-inventory-relational";
import { ResourcePersistenceMapper } from "./resource-persistence.mapper";
import { readResourceReferenceMetadata } from "./resource-reference-metadata";
import { ResourceScopeSchemaReader } from "./resource-scope-schema";

const HistoryCursorSchema = z.strictObject({
  version: z.literal(1),
  resourceId: z.uuid(),
  position: z.number().int().nonnegative(),
});
const HistoryIdentitySchema = z.object({ id: z.uuid(), position: z.number().int().nonnegative() });

export class SequelizeGlobalResourceRepository implements IGlobalResourceRepository {
  private readonly schema: ResourceScopeSchemaReader;
  private readonly mapper = new ResourcePersistenceMapper();

  constructor(
    private readonly database: Sequelize,
    private readonly kind: "application" | "os" = "application"
  ) {
    this.schema = new ResourceScopeSchemaReader(database);
  }

  private async catalog(transaction: Transaction, write: boolean) {
    const root = await ResourceCatalogModel.findOne({
      where: { catalogKey: "global" },
      transaction,
      ...(write ? { lock: transaction.LOCK.UPDATE } : {}),
    });

    if (!root) {
      throw new Error("Catálogo de recursos no inicializado.");
    }
    const definitions = await readDefinitions(this.database, root.id, transaction);
    const bindings = await ResourceBindingModel.findAll({
      where: { templateId: definitions.map((item) => item.id) },
      transaction,
    });

    return new ResourceCatalogPersistenceMapper().toDomain(root, definitions, bindings, []);
  }

  template(options = { existing: true, kind: this.kind }) {
    return this.database.transaction(async (transaction) => {
      const catalog = await this.catalog(transaction, false);
      const template = catalog.definitions.find(
        (item) => item.stockKey.getOrUndefined() === `template:${this.kind}`
      );

      return template
        ? this.specificationResponse(
            captureGlobalResourceSpecification(catalog, template.id.toPrimitive(), {
              ...options,
              kind: this.kind,
            })
          )
        : Result.fail(new ResourceCatalogError("TEMPLATE_UNAVAILABLE"));
    });
  }

  private specificationResponse(result: ReturnType<typeof captureGlobalResourceSpecification>) {
    return result.isSuccess ? Result.ok(result.data.toPrimitive()) : result;
  }

  private async isGlobal(id: UniqueID, transaction: Transaction) {
    const rows = await this.database.query<{
      companyId: unknown;
      scope?: unknown;
      templateId: string;
    }>("SELECT * FROM resources WHERE id=:id", {
      replacements: { id: id.toPrimitive() },
      transaction,
      type: QueryTypes.SELECT,
    });
    const root = rows[0];

    if (!root) {
      return false;
    }
    const mode = await this.schema.read();
    const ownership = ResourceOwnershipSchema.parse({
      scope: mode === "legacy" ? "company" : root.scope,
      companyId: root.companyId,
    });

    if (ownership.scope !== "global") {
      return false;
    }
    const metadata = await readResourceReferenceMetadata(this.database, transaction, mode, {
      globalOnly: true,
      ids: [id.toPrimitive()],
    });

    return metadata[0]?.reference?.kind === this.kind;
  }

  admin(id: UniqueID) {
    return this.database.transaction(async (transaction) => {
      if (!(await this.isGlobal(id, transaction))) {
        return Result.fail(new ResourceCatalogError("RESOURCE_NOT_FOUND"));
      }
      const catalog = await this.catalog(transaction, false);
      const latest = await this.database.query<{ id: string }>(
        "SELECT id FROM resource_revisions WHERE resourceId=:id ORDER BY position DESC LIMIT 1",
        { replacements: { id: id.toPrimitive() }, transaction, type: QueryTypes.SELECT }
      );
      const loaded = await readInventoryByIds(
        this.database,
        [id.toPrimitive()],
        transaction,
        latest.map((item) => item.id)
      );
      const row = loaded.rows[0];

      if (!(row && latest[0])) {
        throw new Error("Raíz global sin revisión actual.");
      }
      const eligible = captureGlobalResourceSpecification(catalog, row.templateId, {
        existing: true,
        kind: this.kind,
      });

      if (!eligible.isSuccess) {
        throw new Error("Plantilla global persistida incompatible.");
      }

      return Result.ok(
        GlobalResourceAdminSchema.parse({
          id: row.id,
          scope: "global",
          companyId: null,
          revisionId: latest[0].id,
          values: row.values,
          specification: row.specification,
        })
      );
    });
  }

  private async writeContext(id: UniqueID, transaction: Transaction) {
    const mode = await this.schema.read();
    const catalog = await this.catalog(transaction, true);
    const roots = await this.database.query<{ companyId: unknown; scope?: unknown }>(
      "SELECT * FROM resources WHERE id=:id FOR UPDATE",
      { replacements: { id: id.toPrimitive() }, transaction, type: QueryTypes.SELECT }
    );
    const root = roots[0];
    const ownership = root
      ? ResourceOwnershipSchema.parse({
          scope: mode === "legacy" ? "company" : root.scope,
          companyId: root.companyId,
        })
      : undefined;
    const loaded =
      ownership?.scope === "global"
        ? await readInventoryByIds(this.database, [id.toPrimitive()], transaction)
        : undefined;
    const row = loaded?.rows[0];
    const expectedTemplate = catalog.definitions.find(
      (item) => item.stockKey.getOrUndefined() === `template:${this.kind}`
    );
    const previous =
      row && loaded && row.templateId === expectedTemplate?.id.toPrimitive()
        ? this.mapper.toScopedDomain(row, loaded.revisions)
        : undefined;

    if (previous) {
      await readResourceReferenceMetadata(this.database, transaction, mode, {
        globalOnly: true,
        ids: [id.toPrimitive()],
      });
    }

    if (
      previous &&
      !captureGlobalResourceSpecification(catalog, previous.values.toPrimitive().templateId, {
        existing: true,
        kind: this.kind,
      }).isSuccess
    ) {
      throw new Error("Plantilla global persistida incompatible.");
    }

    return {
      mode,
      catalog,
      root,
      previous,
      persistedRevisionIds: new Set(previous?.history.map((item) => item.id.toPrimitive()) ?? []),
    };
  }

  async write(id: UniqueID, action: Parameters<IGlobalResourceRepository["write"]>[1]) {
    try {
      return await this.database.transaction(async (transaction) => {
        const { mode, catalog, root, previous, persistedRevisionIds } = await this.writeContext(
          id,
          transaction
        );
        const changed = action({
          catalog,
          resource: previous ? Maybe.some(previous) : Maybe.none(),
          occupied: Boolean(root),
        });

        if (!changed.isSuccess) {
          return changed;
        }
        const validation = await this.validateWrite(changed.data, id, catalog, mode, transaction);

        if (!validation.isSuccess) {
          return validation;
        }
        if (changed.data !== previous) {
          await writeGlobalInventory(
            this.database,
            this.mapper.toGlobalPersistence(changed.data),
            persistedRevisionIds,
            transaction
          );
        }
        const revision = changed.data.history.at(-1);

        if (!revision) {
          throw new Error("Recurso global sin revisión.");
        }

        return Result.ok({
          created: !root,
          resource: GlobalResourceAdminSchema.parse({
            id: changed.data.id.toPrimitive(),
            scope: "global",
            companyId: null,
            revisionId: revision.id.toPrimitive(),
            values: changed.data.values.toPrimitive(),
            specification: changed.data.specification.toPrimitive(),
          }),
        });
      });
    } catch (error) {
      if (error instanceof ResourceCatalogError) {
        return Result.fail(error);
      }
      throw error;
    }
  }

  private async validateWrite(
    resource: Resource,
    id: UniqueID,
    catalog: ResourceCatalog,
    mode: "legacy" | "scoped",
    transaction: Transaction
  ) {
    if (mode !== "scoped") {
      return Result.fail(new ResourceCatalogError("RESOURCE_GLOBAL_FEATURE_DISABLED"));
    }
    if (!resource.id.equals(id) || resource.scope !== "global") {
      throw new ResourceCatalogError("RESOURCE_OWNERSHIP_FIXED");
    }
    const eligible = captureGlobalResourceSpecification(
      catalog,
      resource.values.toPrimitive().templateId,
      { existing: true, kind: this.kind }
    );

    if (!eligible.isSuccess) {
      return eligible;
    }
    const identityError = validateOperatingSystemIdentity(resource, catalog);

    if (identityError) {
      return Result.fail(new ResourceCatalogError(identityError));
    }
    if (this.kind === "os" && (await this.duplicate(resource, catalog, transaction))) {
      return Result.fail(new ResourceCatalogError("OS_DUPLICATE"));
    }

    return Result.ok(undefined);
  }

  /** El lock exclusivo del catálogo serializa esta comprobación con altas y propagaciones. */
  private async duplicate(resource: Resource, catalog: ResourceCatalog, transaction: Transaction) {
    const identity = readOperatingSystemIdentity(catalog, resource.values.toPrimitive());

    if (!completeOperatingSystemIdentity(identity)) {
      return false;
    }
    const rows = await readResourceReferenceMetadata(this.database, transaction, "scoped", {
      globalOnly: true,
      globalKind: "os",
      currentRead: true,
    });

    return rows.some(
      ({ reference }) =>
        reference?.scope === "global" &&
        reference.kind === "os" &&
        reference.id !== resource.id.toPrimitive() &&
        sameOperatingSystemIdentity(identity, reference)
    );
  }

  review(values: ResourceInput) {
    return this.database.transaction(async (transaction) => {
      const catalog = await this.catalog(transaction, false);
      const identity = readOperatingSystemIdentity(catalog, values);
      const rows = await readResourceReferenceMetadata(
        this.database,
        transaction,
        await this.schema.read(),
        { globalOnly: true }
      );

      return {
        identity,
        duplicates: rows.flatMap(({ reference }) =>
          reference?.scope === "global" &&
          reference.kind === "os" &&
          sameOperatingSystemIdentity(identity, reference)
            ? [reference]
            : []
        ),
      };
    });
  }

  history(id: UniqueID, query: ListGlobalApplicationHistoryRequestDTO) {
    return this.database.transaction(async (transaction) => {
      if (!(await this.isGlobal(id, transaction))) {
        return Result.fail(new ResourceCatalogError("RESOURCE_NOT_FOUND"));
      }
      let position: number | null = null;

      if (query.cursor) {
        try {
          const cursor = HistoryCursorSchema.parse(
            JSON.parse(Buffer.from(query.cursor, "base64url").toString("utf8"))
          );

          if (cursor.resourceId !== id.toPrimitive()) {
            return Result.fail(new ResourceCatalogError("INVALID_REQUEST"));
          }
          position = cursor.position;
        } catch {
          return Result.fail(new ResourceCatalogError("INVALID_REQUEST"));
        }
      }
      const identities = z.array(HistoryIdentitySchema).parse(
        await this.database.query(
          "SELECT id,position FROM resource_revisions WHERE resourceId=:id AND (:position IS NULL OR position < :position) ORDER BY position DESC LIMIT :limit",
          {
            replacements: { id: id.toPrimitive(), position, limit: query.pageSize + 1 },
            transaction,
            type: QueryTypes.SELECT,
          }
        )
      );
      const page = identities.slice(0, query.pageSize);
      const loaded = await readInventoryByIds(
        this.database,
        [id.toPrimitive()],
        transaction,
        page.map((item) => item.id)
      );
      const actors = page.length
        ? await this.database.query<{ id: string; name: string }>(
            "SELECT u.id,u.name FROM users u JOIN resource_revisions r ON r.actorId=u.id WHERE r.id IN (:ids)",
            {
              replacements: { ids: page.map((item) => item.id) },
              transaction,
              type: QueryTypes.SELECT,
            }
          )
        : [];
      const last = page.at(-1);

      return Result.ok(
        ListGlobalApplicationHistoryResponseSchema.parse({
          items: page.map((item) => {
            const revision = loaded.revisions.find((entry) => entry.id === item.id);

            if (!revision) {
              throw new Error("Revisión global ausente.");
            }

            return {
              id: revision.id,
              values: revision.values,
              specification: revision.specification,
              actorId: revision.actorId,
              actorName:
                actors.find((actor) => actor.id === revision.actorId)?.name ?? revision.actorId,
              recordedAt: revision.recordedAt,
            };
          }),
          nextCursor:
            last && identities.length > page.length
              ? Buffer.from(
                  JSON.stringify({
                    version: 1,
                    resourceId: id.toPrimitive(),
                    position: last.position,
                  })
                ).toString("base64url")
              : null,
        })
      );
    });
  }
}