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 type { IAssetRepository, InventoryContext } from "../../application/asset.repository";
import { AssetCatalogError } from "../../domain/asset-definition";
import type { Workstation } from "../../domain/workstation.aggregate";

import { AvailabilityModel, CatalogModel } from "./asset-catalog.model";
import { AssetCatalogPersistenceMapper } from "./asset-catalog-persistence.mapper";
import { readBindings, readDefinitions } from "./asset-catalog-relational";
import { readInventory, writeInventory } from "./asset-inventory-relational";
import { AssetPersistenceMapper, inventoryIdentity } from "./asset-persistence.mapper";
import { sqlIdentifier } from "./asset-relational-sql";
import { RelationshipModel } from "./asset-relationship.model";
import { AssetRelationshipPersistenceMapper } from "./asset-relationship-persistence.mapper";
import { loadWorkstations } from "./load-workstations";
import { readBrands } from "./sequelize-brand.repository";
import { WorkstationAssetModel } from "./workstation.model";
import { WorkstationPersistenceMapper } from "./workstation-persistence.mapper";
import { writeWorkstation } from "./workstation-relational";

export class SequelizeAssetRepository implements IAssetRepository {
  private readonly mapper = new AssetPersistenceMapper();

  constructor(private readonly database: Sequelize) {}

  private async load(
    companyId: UniqueID,
    transaction: Transaction,
    write: boolean
  ): Promise<Result<InventoryContext, AssetCatalogError>> {
    // Orden fijo de bloqueos: catálogo antes de compañía, compartido con las escrituras del catálogo.
    const root = await CatalogModel.findOne({
      where: { catalogKey: "global" },
      transaction,
      ...(write ? { lock: transaction.LOCK.UPDATE } : {}),
    });

    if (!root) {
      throw new Error("Catálogo no inicializado.");
    }
    const replacements = { id: companyId.toPrimitive() };
    const companies = await this.database.query<{ id: string }>(
      `SELECT id FROM companies WHERE id=:id${write ? " FOR UPDATE" : ""}`,
      { replacements, type: QueryTypes.SELECT, transaction }
    );

    if (!companies.length) {
      return Result.fail(new AssetCatalogError("COMPANY_NOT_FOUND"));
    }
    const definitions = await readDefinitions(this.database, root.id, transaction);
    const bindings = await readBindings(
      this.database,
      definitions.map((item) => item.id),
      transaction
    );
    const overrides = await AvailabilityModel.findAll({
      where: { catalogId: root.id },
      transaction,
    });
    const catalog = new AssetCatalogPersistenceMapper().toDomain(
      root,
      definitions,
      bindings,
      overrides
    );
    const { rows, revisions } = await readInventory(
      this.database,
      companyId.toPrimitive(),
      transaction
    );
    const sites = await this.database.query<{ id: string }>(
      "SELECT id FROM company_sites WHERE companyId=:id",
      { replacements, type: QueryTypes.SELECT, transaction }
    );
    const people = await this.database.query<{ id: string; active: boolean }>(
      "SELECT id, active FROM company_contacts WHERE companyId=:id",
      { replacements, type: QueryTypes.SELECT, transaction }
    );
    const actors = await this.database.query<{ id: string; name: string }>(
      "SELECT id, name FROM users",
      { type: QueryTypes.SELECT, transaction }
    );
    const assets = rows.map((row) => {
      const asset = this.mapper.toDomain(
        row,
        revisions.filter((revision) => revision.assetId === row.id)
      );
      const spec = asset.specification.toPrimitive();
      const template = definitions.find((item) => item.id === spec.templateId);

      if (
        !template ||
        (template.companyId !== null && template.companyId !== companyId.toPrimitive())
      ) {
        throw new Error("Plantilla de activo fuera de su compañía.");
      }
      for (const revision of asset.history) {
        const values = revision.values.toPrimitive();

        if (values.siteId && !sites.some((site) => site.id === values.siteId)) {
          throw new Error("Asignación de inventario fuera de su compañía.");
        }
      }

      return asset;
    });
    const relationships = (
      await RelationshipModel.findAll({
        where: { companyId: companyId.toPrimitive() },
        transaction,
      })
    ).map((row) => new AssetRelationshipPersistenceMapper().toDomain(row));

    for (const relationship of relationships) {
      const values = relationship.values;
      const definition = catalog
        .visible(Maybe.some(companyId))
        .find((item) => item.id.equals(values.typeId));

      if (
        !(
          definition &&
          definition.values.data.kind === "relation" &&
          definition.values.data.symmetric === values.symmetric &&
          [values.sourceId, values.targetId].every((id) =>
            assets.some((asset) => asset.id.equals(id))
          )
        )
      ) {
        throw new Error("Relación de activos fuera de su compañía.");
      }
    }
    const workstations = await loadWorkstations(companyId, transaction, assets, sites, people);

    return Result.ok({
      workstations,
      brands: await readBrands(this.database, transaction, write),
      relationships,
      catalog,
      assets,
      sites: sites.map((site) => inventoryIdentity(site.id)),
      people: people.map((person) => ({
        id: inventoryIdentity(person.id),
        active: Boolean(person.active),
      })),
      actorNames: new Map(actors.map((actor) => [actor.id, actor.name])),
    });
  }

  saveWorkstation(companyId: UniqueID, action: Parameters<IAssetRepository["saveWorkstation"]>[1]) {
    return this.database.transaction(async (transaction) => {
      const loaded = await this.load(companyId, transaction, true);

      if (!loaded.isSuccess) {
        return Result.fail(loaded.error);
      }
      const changed = action(loaded.data);

      if (!changed.isSuccess) {
        return Result.fail(changed.error);
      }
      const previous = loaded.data.workstations.find((item) => item.id.equals(changed.data.id));

      if (previous !== changed.data) {
        await this.persistWorkstation(changed.data, previous, transaction);
      }

      return Result.ok({ workstation: changed.data, actorNames: loaded.data.actorNames });
    });
  }

  removeWorkstation(companyId: UniqueID, id: UniqueID): Promise<Result<void, AssetCatalogError>> {
    return this.database.transaction(async (transaction) => {
      const loaded = await this.load(companyId, transaction, true);

      if (!loaded.isSuccess) {
        return Result.fail(loaded.error);
      }
      if (!loaded.data.workstations.some((item) => item.id.equals(id))) {
        return Result.fail(new AssetCatalogError("WORKSTATION_NOT_FOUND"));
      }
      const references = await this.database.query<{ tableName: string; columnName: string }>(
        "SELECT TABLE_NAME AS tableName,COLUMN_NAME AS columnName FROM information_schema.KEY_COLUMN_USAGE WHERE REFERENCED_TABLE_SCHEMA=DATABASE() AND REFERENCED_TABLE_NAME='workstations' AND REFERENCED_COLUMN_NAME='id'",
        { type: QueryTypes.SELECT, transaction }
      );
      const owned = new Set(["workstation_assets", "workstation_members", "workstation_revisions"]);
      const replacements = { id: id.toPrimitive(), companyId: companyId.toPrimitive() };

      for (const reference of references) {
        if (owned.has(reference.tableName)) {
          continue;
        }
        const rows = await this.database.query<{ value: number }>(
          `SELECT 1 AS value FROM ${sqlIdentifier(reference.tableName)} WHERE ${sqlIdentifier(reference.columnName)}=:id LIMIT 1`,
          { replacements, transaction, type: QueryTypes.SELECT }
        );

        if (rows.length) {
          return Result.fail(new AssetCatalogError("WORKSTATION_IN_USE"));
        }
      }
      // Las asociaciones de composición se eliminan; sus activos no se borran.
      await this.database.query("DELETE FROM workstation_assets WHERE workstationId=:id", {
        replacements,
        transaction,
      });
      await this.database.query("DELETE FROM workstation_revisions WHERE workstationId=:id", {
        replacements,
        transaction,
      });
      await this.database.query("DELETE FROM workstations WHERE companyId=:companyId AND id=:id", {
        replacements,
        transaction,
      });

      return Result.ok(undefined);
    });
  }

  private async persistWorkstation(
    item: Workstation,
    previous: Workstation | undefined,
    transaction: Transaction
  ) {
    const rows = new WorkstationPersistenceMapper().toPersistence(item);

    const existing = new Set(previous?.history.map((item) => item.id.toPrimitive()));

    await writeWorkstation(this.database, rows, existing, transaction);
    for (const reference of rows.references) {
      await WorkstationAssetModel.upsert(reference, { transaction });
    }
  }

  private async hasExternalReferences(assetId: string, transaction: Transaction) {
    const references = await this.database.query<{ tableName: string; columnName: string }>(
      "SELECT TABLE_NAME AS tableName,COLUMN_NAME AS columnName FROM information_schema.KEY_COLUMN_USAGE WHERE REFERENCED_TABLE_SCHEMA=DATABASE() AND REFERENCED_TABLE_NAME='assets' AND REFERENCED_COLUMN_NAME='id'",
      { type: QueryTypes.SELECT, transaction }
    );
    const ownedTables = new Set([
      "asset_characteristics",
      "asset_revision_characteristics",
      "asset_revisions",
      "asset_specification_field_choices",
      "asset_specification_fields",
      "asset_specification_sections",
    ]);

    for (const reference of references) {
      if (ownedTables.has(reference.tableName)) {
        continue;
      }
      const rows = await this.database.query<{ value: number }>(
        `SELECT 1 AS value FROM ${sqlIdentifier(reference.tableName)} WHERE ${sqlIdentifier(reference.columnName)}=:assetId LIMIT 1`,
        { replacements: { assetId }, type: QueryTypes.SELECT, transaction }
      );

      if (rows.length) {
        return true;
      }
    }

    return false;
  }

  private async removeInventory(assetId: string, companyId: string, transaction: Transaction) {
    for (const table of [
      "asset_revision_characteristics",
      "asset_characteristics",
      "asset_specification_field_choices",
      "asset_specification_fields",
      "asset_specification_sections",
      "asset_revisions",
    ]) {
      await this.database.query(`DELETE FROM ${sqlIdentifier(table)} WHERE assetId=:assetId`, {
        replacements: { assetId },
        transaction,
      });
    }
    await this.database.query("DELETE FROM assets WHERE companyId=:companyId AND id=:assetId", {
      replacements: { assetId, companyId },
      transaction,
    });
  }

  remove(companyId: UniqueID, id: UniqueID) {
    return this.database.transaction(async (transaction) => {
      const loaded = await this.load(companyId, transaction, true);

      if (!loaded.isSuccess) {
        return Result.fail(loaded.error);
      }
      const asset = loaded.data.assets.find((item) => item.id.equals(id));

      if (!asset) {
        return Result.fail(new AssetCatalogError("ASSET_NOT_FOUND"));
      }
      if (await this.hasExternalReferences(id.toPrimitive(), transaction)) {
        return Result.fail(new AssetCatalogError("ASSET_IN_USE"));
      }
      await this.removeInventory(id.toPrimitive(), companyId.toPrimitive(), transaction);

      return Result.ok({ asset, actorNames: loaded.data.actorNames });
    });
  }

  removeRelationship(company: UniqueID, id: UniqueID): Promise<Result<void, AssetCatalogError>> {
    return this.database.transaction(async (transaction) => {
      await this.database.query("SELECT id FROM companies WHERE id=:companyId FOR UPDATE", {
        replacements: { companyId: company.toPrimitive() },
        transaction,
        type: QueryTypes.SELECT,
      });
      const row = await RelationshipModel.findOne({
        where: { companyId: company.toPrimitive(), id: id.toPrimitive() },
        transaction,
        lock: transaction.LOCK.UPDATE,
      });

      if (!row) {
        return Result.fail(new AssetCatalogError("RELATIONSHIP_NOT_FOUND"));
      }
      await row.destroy({ transaction });

      return Result.ok(undefined);
    });
  }

  saveRelationship(
    companyId: UniqueID,
    action: Parameters<IAssetRepository["saveRelationship"]>[1]
  ) {
    return this.database.transaction(async (transaction) => {
      const loaded = await this.load(companyId, transaction, true);

      if (!loaded.isSuccess) {
        return Result.fail(loaded.error);
      }
      const changed = action(loaded.data);

      if (!changed.isSuccess) {
        return Result.fail(changed.error);
      }
      const previous = loaded.data.relationships.find((item) => item.id.equals(changed.data.id));

      if (previous !== changed.data) {
        await RelationshipModel.upsert(
          new AssetRelationshipPersistenceMapper().toPersistence(changed.data),
          { transaction }
        );
      }

      return Result.ok({ relationship: changed.data, actorNames: loaded.data.actorNames });
    });
  }

  get(companyId: UniqueID) {
    return this.database.transaction((transaction) => this.load(companyId, transaction, false));
  }

  save(companyId: UniqueID, action: Parameters<IAssetRepository["save"]>[1]) {
    return this.database.transaction(async (transaction) => {
      const loaded = await this.load(companyId, transaction, true);

      if (!loaded.isSuccess) {
        return Result.fail(loaded.error);
      }
      const changed = action(loaded.data);

      if (!changed.isSuccess) {
        return Result.fail(changed.error);
      }
      const previous = loaded.data.assets.find((asset) => asset.id.equals(changed.data.id));

      if (changed.data !== previous) {
        const rows = this.mapper.toPersistence(changed.data);
        const existing = new Set(previous?.history.map((revision) => revision.id.toPrimitive()));

        await writeInventory(this.database, rows, existing, transaction);
      }

      return Result.ok({ asset: changed.data, actorNames: loaded.data.actorNames });
    });
  }
}