import type { ModelAttributeColumnOptions, Sequelize, Transaction } from "sequelize";
import { DataTypes, QueryTypes } from "sequelize";
import { z } from "zod/v4";

import {
  AccessDefinitionSchema,
  type AccessKind,
  AccessKindSchema,
} from "../../domain/access/access-definition";

import { supportIdentifier, writeSupportScalars } from "./support-record-relational";

const ref = (model = "access_items", allowNull = false): ModelAttributeColumnOptions => ({
  type: DataTypes.UUID,
  allowNull,
  references: { model, key: "id" },
  onDelete: "RESTRICT",
});

const named = {
  name: { type: DataTypes.STRING(100), allowNull: false },
  active: { type: DataTypes.BOOLEAN, allowNull: false },
};
const note = { type: DataTypes.TEXT, allowNull: true };
const scope = { systemId: ref(), environmentId: ref("access_items", true) };
const period = {
  startDate: { type: DataTypes.STRING(10), allowNull: false },
  endDate: { type: DataTypes.STRING(10), allowNull: true },
};
const configuration = { type: DataTypes.STRING(20), allowNull: false };

export const accessColumns: Record<AccessKind, Record<string, ModelAttributeColumnOptions>> = {
  system: named,
  resource_type: named,
  permission: { ...named, resourceTypeId: ref(), description: note },
  template: { ...named, description: note, systemId: ref("access_items", true) },
  environment: { ...named, systemId: ref() },
  account: {
    ...scope,
    login: { type: DataTypes.STRING(255), allowNull: false },
    usage: { type: DataTypes.STRING(16), allowNull: false },
    active: named.active,
    expiresOn: { type: DataTypes.STRING(10), allowNull: true },
    notes: note,
  },
  account_person: {
    accountId: ref(),
    personId: ref("company_contacts"),
    ...period,
    configuration: { ...configuration, allowNull: true },
  },
  group: {
    ...scope,
    ...named,
    identifier: { type: DataTypes.STRING(255), allowNull: false },
    description: note,
    templateId: ref("access_items", true),
  },
  membership: { accountId: ref(), groupId: ref(), ...period, configuration },
  resource: {
    ...named,
    resourceTypeId: ref(),
    systemId: ref("access_items", true),
    environmentId: ref("access_items", true),
    reference: { type: DataTypes.STRING(255), allowNull: true },
    notes: note,
  },
  grant: {
    resourceId: ref(),
    permissionId: ref(),
    accountId: ref("access_items", true),
    groupId: ref("access_items", true),
    ...period,
    configuration,
  },
  need: { personId: ref("company_contacts"), resourceId: ref(), ...period, notes: note },
  coverage: {
    needId: ref(),
    grantId: ref(),
    accountPersonId: ref(),
    membershipId: ref("access_items", true),
    ...period,
  },
};

export function accessValueTable(kind: AccessKind, history = false) {
  return `access_${kind}_${history ? "revision_" : ""}values`;
}

const itemSchema = z.object({
  id: z.uuid(),
  workspaceId: z.uuid(),
  kind: AccessKindSchema,
  values: AccessDefinitionSchema,
});
const revisionSchema = z.object({
  id: z.uuid(),
  itemId: z.uuid(),
  sequence: z.number().int().nonnegative(),
  actorId: z.uuid(),
  recordedAt: z.iso.datetime(),
  values: AccessDefinitionSchema,
});

export type AccessItemRow = z.infer<typeof itemSchema>;

export type AccessRevisionRow = z.infer<typeof revisionSchema>;

function decoded(row: Record<string, unknown>, permissionIds: string[]) {
  const kind = AccessKindSchema.parse(row.kind);
  const values = Object.fromEntries(
    Object.keys(accessColumns[kind]).map((key) => [
      key,
      key === "active"
        ? z
            .union([z.boolean(), z.literal(0), z.literal(1)])
            .transform(Boolean)
            .parse(row[key])
        : row[key],
    ])
  );

  return AccessDefinitionSchema.parse({
    kind,
    ...values,
    ...(kind === "need" ? { permissionIds } : {}),
  });
}

export async function readAccessItems(
  database: Sequelize,
  transaction: Transaction,
  companyId?: string
) {
  const rows = await database.query<Record<string, unknown>>(
    `SELECT i.id,i.workspaceId,v.* FROM access_items i JOIN access_workspaces w ON w.id=i.workspaceId LEFT JOIN access_current_values v ON v.ownerId=i.id AND v.kind=i.kind${companyId ? " WHERE w.companyId=:companyId OR w.companyId IS NULL" : ""}`,
    { replacements: { companyId: companyId ?? null }, transaction, type: QueryTypes.SELECT }
  );
  const permissions = await database.query<{
    ownerId: string;
    permissionId: string;
    position: number;
  }>("SELECT * FROM access_need_permissions ORDER BY ownerId,position", {
    transaction,
    type: QueryTypes.SELECT,
  });

  return rows.map((row) =>
    itemSchema.parse({ ...row, values: decoded(row, permissionIds(permissions, row.id)) })
  );
}

export async function readAccessRevisions(database: Sequelize, transaction: Transaction) {
  const rows = await database.query<Record<string, unknown>>(
    "SELECT r.id,r.itemId,r.sequence,r.actorId,r.recordedAt,v.* FROM access_revisions r JOIN access_items i ON i.id=r.itemId LEFT JOIN access_historical_values v ON v.ownerId=r.id AND v.kind=i.kind",
    { transaction, type: QueryTypes.SELECT }
  );
  const permissions = await database.query<{
    ownerId: string;
    permissionId: string;
    position: number;
  }>("SELECT * FROM access_need_revision_permissions ORDER BY ownerId,position", {
    transaction,
    type: QueryTypes.SELECT,
  });

  return rows.map((row) =>
    revisionSchema.parse({ ...row, values: decoded(row, permissionIds(permissions, row.id)) })
  );
}

function permissionIds(
  rows: readonly { ownerId: string; permissionId: string; position: number }[],
  id: unknown
) {
  const selected = rows.filter((row) => row.ownerId === id);

  if (selected.some((row, position) => row.position !== position)) {
    throw new Error("Orden de permisos de necesidad inconsistente.");
  }

  return selected.map((row) => row.permissionId);
}

export async function writeAccessRow(
  database: Sequelize,
  row: AccessItemRow | AccessRevisionRow,
  transaction: Transaction,
  operation: "insert" | "update"
) {
  const { values, ...metadata } = row;
  const input = AccessDefinitionSchema.parse(values);
  const history = "itemId" in row;

  await writeSupportScalars(
    database,
    history ? "access_revisions" : "access_items",
    metadata,
    transaction,
    operation
  );
  await writeAccessValues(database, row.id, input, history, transaction);
}

async function writeAccessValues(
  database: Sequelize,
  id: string,
  input: z.infer<typeof AccessDefinitionSchema>,
  history: boolean,
  transaction: Transaction
) {
  const { kind, ...values } = input;
  const { permissionIds: _permissions, ...columns } = z
    .record(z.string(), z.unknown())
    .parse(values);
  const table = accessValueTable(kind, history);

  await database.query(`DELETE FROM ${supportIdentifier(table)} WHERE ownerId=:id`, {
    replacements: { id },
    transaction,
  });
  await writeSupportScalars(database, table, { ownerId: id, ...columns }, transaction, "insert");
  if (kind === "need") {
    const links = history ? "access_need_revision_permissions" : "access_need_permissions";

    await database.query(`DELETE FROM ${supportIdentifier(links)} WHERE ownerId=:id`, {
      replacements: { id },
      transaction,
    });
    for (const [position, permissionId] of input.permissionIds.entries()) {
      await writeSupportScalars(
        database,
        links,
        { ownerId: id, permissionId, position },
        transaction,
        "insert"
      );
    }
  }
}

async function prepareAccessValues(database: Sequelize) {
  const query = database.getQueryInterface();
  const existing = await database.query<{ name: string }>(
    "SELECT TABLE_NAME AS name FROM information_schema.TABLES WHERE TABLE_SCHEMA=DATABASE()",
    { type: QueryTypes.SELECT }
  );

  for (const kind of AccessKindSchema.options) {
    for (const history of [false, true]) {
      const table = accessValueTable(kind, history);

      if (!existing.some((row) => row.name === table)) {
        await query.createTable(table, {
          ownerId: {
            ...ref(history ? "access_revisions" : "access_items"),
            primaryKey: true,
            onDelete: "CASCADE",
          },
          ...accessColumns[kind],
        });
      }
    }
  }
  await prepareNeedPermissions(database, existing);
  await createAccessViews(database);
}

async function prepareNeedPermissions(database: Sequelize, existing: readonly { name: string }[]) {
  const query = database.getQueryInterface();

  for (const history of [false, true]) {
    const table = history ? "access_need_revision_permissions" : "access_need_permissions";

    if (!existing.some((row) => row.name === table)) {
      await query.createTable(table, {
        ownerId: {
          ...ref(accessValueTable("need", history)),
          references: { model: accessValueTable("need", history), key: "ownerId" },
          primaryKey: true,
          onDelete: "CASCADE",
        },
        position: { type: DataTypes.INTEGER, allowNull: false, primaryKey: true },
        permissionId: ref(),
      });
    }
    const indexes = await database.query<{ name: string }>(
      "SELECT DISTINCT INDEX_NAME AS name FROM information_schema.STATISTICS WHERE TABLE_SCHEMA=DATABASE() AND TABLE_NAME=:table",
      { replacements: { table }, type: QueryTypes.SELECT }
    );

    if (!indexes.some((index) => index.name === `${table}_unique`)) {
      await query.addIndex(table, ["ownerId", "permissionId"], {
        unique: true,
        name: `${table}_unique`,
      });
    }
  }
}

async function createAccessViews(database: Sequelize) {
  // Vistas de lectura: columnas SQL, sin reconstruir documentos JSON en la base.
  const allColumns = [...new Set(Object.values(accessColumns).flatMap(Object.keys))];

  for (const history of [false, true]) {
    const selections = AccessKindSchema.options.map(
      (kind) =>
        `SELECT ownerId,'${kind}' AS kind,${allColumns.map((name) => (name in accessColumns[kind] ? supportIdentifier(name) : `NULL AS ${supportIdentifier(name)}`)).join(",")} FROM ${supportIdentifier(accessValueTable(kind, history))}`
    );

    await database.query(
      `CREATE OR REPLACE VIEW ${history ? "access_historical_values" : "access_current_values"} AS ${selections.join(" UNION ALL ")}`
    );
  }
}

export async function initializeAccessValues(database: Sequelize) {
  await prepareAccessValues(database);
}

export function readCompanyAccessItems(
  database: Sequelize,
  companyId: string,
  transaction: Transaction
) {
  return readAccessItems(database, transaction, companyId);
}