import type { Sequelize, Transaction } from "sequelize";
import { QueryTypes } from "sequelize";

import type { ResourceInput, ResourceSpecificationData } from "../../domain/resource-values";
import { ResourceInputSchema, ResourceSpecificationSchema } from "../../domain/resource-values";

import type { ResourcePersistenceMapper } from "./resource-persistence.mapper";
import { readResourceRows, sqlIdentifier, writeResourceRow } from "./resource-relational-sql";
import {
  readResourceRevisionSpecifications,
  writeResourceRevisionSpecification,
} from "./resource-revision-specifications";

export type InventoryRow = {
  id: string;
  companyId: string;
  templateId: string;
  values: unknown;
  specification: unknown;
};

export type RevisionRow = {
  id: string;
  resourceId: string;
  actorId: string;
  recordedAt: string;
  position: number;
  specification?: unknown;
  values: unknown;
};

type IntegrationColumns = {
  integrationKind: string | null;
  addressFieldId: string | null;
  contextFieldId: string | null;
  mailboxKind: string | null;
  accountId: string | null;
  referenceFieldId: string | null;
  resourceTypeId: string | null;
  systemId: string | null;
  environmentId: string | null;
};

function integration(row: IntegrationColumns) {
  switch (row.integrationKind) {
    case null:
      return {};
    case "mailbox":
      return {
        integration: {
          kind: "mailbox",
          addressFieldId: row.addressFieldId,
          contextFieldId: row.contextFieldId,
          mailboxKind: row.mailboxKind,
          accountId: row.accountId,
        },
      };
    case "access":
      return {
        integration: {
          kind: "access",
          referenceFieldId: row.referenceFieldId,
          resourceTypeId: row.resourceTypeId,
          systemId: row.systemId,
          environmentId: row.environmentId,
        },
      };
    default:
      throw new Error("Integración de recurso persistida inconsistente.");
  }
}

function integrationColumns(values: ResourceInput): IntegrationColumns {
  const item = values.integration;

  return {
    integrationKind: item?.kind ?? null,
    addressFieldId: item?.kind === "mailbox" ? item.addressFieldId : null,
    contextFieldId: item?.kind === "mailbox" ? item.contextFieldId : null,
    mailboxKind: item?.kind === "mailbox" ? item.mailboxKind : null,
    accountId: item?.kind === "mailbox" ? item.accountId : null,
    referenceFieldId: item?.kind === "access" ? item.referenceFieldId : null,
    resourceTypeId: item?.kind === "access" ? item.resourceTypeId : null,
    systemId: item?.kind === "access" ? item.systemId : null,
    environmentId: item?.kind === "access" ? item.environmentId : null,
  };
}

type ResourceRow = Omit<InventoryRow, "values" | "specification"> &
  IntegrationColumns & {
    name: string;
    active: boolean;
    notes: string;
    templateName: string;
    sectionsDefined: boolean;
  };

type RevisionColumns = Omit<RevisionRow, "values" | "specification"> &
  IntegrationColumns & {
    name: string;
    active: boolean;
    notes: string;
    templateId: string;
  };

type SpecificationField = Omit<ResourceSpecificationData["fields"][number], "type" | "choices"> & {
  resourceId: string;
  fieldType: string;
  position: number;
};

type SpecificationSection = {
  resourceId: string;
  id: string;
  name: string;
  description: string;
  position: number;
};

type SpecificationChoice = { resourceId: string; fieldId: string; position: number; value: string };

type CharacteristicRow = {
  resourceId: string;
  revisionId?: string;
  fieldId: string;
  valueType: string;
  textValue: string | null;
  numberValue: number | null;
  booleanValue: boolean | null;
  dateValue: string | null;
};

export function decodeCharacteristic(
  row: Omit<CharacteristicRow, "resourceId" | "fieldId" | "revisionId">
) {
  const populated = [row.textValue, row.numberValue, row.booleanValue, row.dateValue].filter(
    (value) => value !== null
  );

  if (populated.length !== 1) {
    throw new Error("Valor tipado de recurso persistido inconsistente.");
  }
  switch (row.valueType) {
    case "text":
    case "choice":
      if (row.textValue !== null) {
        return row.textValue;
      }
      break;
    case "number":
      if (row.numberValue !== null) {
        return Number(row.numberValue);
      }
      break;
    case "boolean":
      if (row.booleanValue !== null) {
        return Boolean(row.booleanValue);
      }
      break;
    case "date":
      if (row.dateValue !== null) {
        return row.dateValue;
      }
      break;
  }
  throw new Error("Tipo de característica persistida inconsistente.");
}

function characteristicRows(
  resourceId: string,
  values: ResourceInput,
  specification: ResourceSpecificationData,
  revisionId?: string
) {
  return Object.entries(values.characteristics).map(([fieldId, value]) => {
    const type = specification.fields.find((field) => field.fieldId === fieldId)?.type;

    if (!type) {
      throw new Error("Campo de recurso sin especificación.");
    }

    return {
      resourceId,
      ...(revisionId ? { revisionId } : {}),
      fieldId,
      valueType: type,
      textValue: type === "text" || type === "choice" ? String(value) : null,
      numberValue: type === "number" && typeof value === "number" ? value : null,
      booleanValue: type === "boolean" && typeof value === "boolean" ? value : null,
      dateValue: type === "date" ? String(value) : null,
    };
  });
}

export async function readInventory(
  database: Sequelize,
  companyId: string,
  transaction: Transaction
) {
  const resources = await readResourceRows<ResourceRow>(
    database,
    "resources",
    "companyId",
    [companyId],
    transaction
  );
  const ids = resources.map((row) => row.id);
  const fields = await readResourceRows<SpecificationField>(
    database,
    "resource_specification_fields",
    "resourceId",
    ids,
    transaction
  );
  const sections = await readResourceRows<SpecificationSection>(
    database,
    "resource_specification_sections",
    "resourceId",
    ids,
    transaction
  );
  const choices = await readResourceRows<SpecificationChoice>(
    database,
    "resource_specification_field_choices",
    "resourceId",
    ids,
    transaction
  );
  const current = await readCharacteristics(database, "resource_characteristics", ids, transaction);
  const histories = await readResourceRows<RevisionColumns>(
    database,
    "resource_revisions",
    "resourceId",
    ids,
    transaction
  );
  const historical = await readCharacteristics(
    database,
    "resource_revision_characteristics",
    ids,
    transaction
  );

  const values = (row: ResourceRow | RevisionColumns, entries: CharacteristicRow[]) =>
    ResourceInputSchema.parse({
      name: row.name,
      templateId: row.templateId,
      active: Boolean(row.active),
      ...integration(row),
      notes: row.notes,
      characteristics: Object.fromEntries(
        entries.map((entry) => [entry.fieldId, decodeCharacteristic(entry)])
      ),
    });

  const rows: InventoryRow[] = resources.map((row) => ({
    ...row,
    values: values(
      row,
      current.filter((entry) => entry.resourceId === row.id)
    ),
    specification: ResourceSpecificationSchema.parse({
      templateId: row.templateId,
      templateName: row.templateName,
      ...(row.sectionsDefined
        ? {
            sections: sections
              .filter((section) => section.resourceId === row.id)
              .sort((a, b) => a.position - b.position)
              .map(({ id, name, description }) => ({ id, name, description })),
          }
        : {}),
      fields: fields
        .filter((field) => field.resourceId === row.id)
        .sort((a, b) => a.position - b.position)
        .map((field) => ({
          fieldId: field.fieldId,
          name: field.name,
          type: field.fieldType,
          unit: field.unit,
          required: Boolean(field.required),
          ...(field.sectionId ? { sectionId: field.sectionId } : {}),
          choices: choices
            .filter((choice) => choice.resourceId === row.id && choice.fieldId === field.fieldId)
            .sort((a, b) => a.position - b.position)
            .map((choice) => choice.value),
        })),
    }),
  }));
  const revisionSpecifications = await readResourceRevisionSpecifications(
    database,
    ids,
    transaction
  );
  const revisions: RevisionRow[] = histories.map((row) => {
    const specification = revisionSpecifications.get(row.id);

    if (!specification) {
      throw new Error("Revisión sin especificación histórica persistida.");
    }

    return {
      ...row,
      specification,
      values: values(
        row,
        historical.filter((entry) => entry.revisionId === row.id)
      ),
    };
  });

  return { rows, revisions };
}

export async function writeInventory(
  database: Sequelize,
  rows: ReturnType<ResourcePersistenceMapper["toPersistence"]>,
  existing: Set<string>,
  transaction: Transaction
) {
  const { resource, revisions } = rows;
  const v = resource.values;
  const specification = resource.specification;

  await writeResourceRow(
    database,
    "resources",
    {
      id: resource.id,
      companyId: resource.companyId,
      templateId: v.templateId,
      ...integrationColumns(v),
      name: v.name,
      active: v.active,
      notes: v.notes,
      templateName: specification.templateName,
      sectionsDefined: specification.sections !== undefined,
    },
    transaction
  );
  for (const table of [
    "resource_characteristics",
    "resource_specification_field_choices",
    "resource_specification_fields",
    "resource_specification_sections",
  ]) {
    await database.query(`DELETE FROM ${sqlIdentifier(table)} WHERE resourceId=:id`, {
      replacements: { id: resource.id },
      transaction,
    });
  }
  for (const [position, section] of (specification.sections ?? []).entries()) {
    await writeResourceRow(
      database,
      "resource_specification_sections",
      { ...section, resourceId: resource.id, position },
      transaction
    );
  }
  for (const [position, field] of specification.fields.entries()) {
    await writeResourceRow(
      database,
      "resource_specification_fields",
      {
        resourceId: resource.id,
        fieldId: field.fieldId,
        name: field.name,
        fieldType: field.type,
        unit: field.unit,
        required: field.required,
        sectionId: field.sectionId ?? null,
        position,
      },
      transaction
    );
    for (const [choicePosition, value] of field.choices.entries()) {
      await writeResourceRow(
        database,
        "resource_specification_field_choices",
        {
          resourceId: resource.id,
          fieldId: field.fieldId,
          position: choicePosition,
          value,
        },
        transaction
      );
    }
  }

  for (const row of characteristicRows(resource.id, v, specification)) {
    await writeResourceRow(database, "resource_characteristics", row, transaction);
  }
  for (const revision of revisions) {
    if (existing.has(revision.id)) {
      continue;
    }
    const previous = revision.values;

    await writeResourceRow(
      database,
      "resource_revisions",
      {
        id: revision.id,
        resourceId: resource.id,
        actorId: revision.actorId,
        recordedAt: revision.recordedAt,
        position: revision.position,
        templateId: previous.templateId,
        ...integrationColumns(previous),
        name: previous.name,
        active: previous.active,
        notes: previous.notes,
      },
      transaction
    );
    await writeResourceRevisionSpecification(
      database,
      resource.id,
      revision.id,
      revision.specification,
      transaction
    );
    for (const row of characteristicRows(
      resource.id,
      previous,
      revision.specification,
      revision.id
    )) {
      await writeResourceRow(database, "resource_revision_characteristics", row, transaction);
    }
  }
}

async function readCharacteristics(
  database: Sequelize,
  table: "resource_characteristics" | "resource_revision_characteristics",
  ids: string[],
  transaction: Transaction
) {
  if (!ids.length) {
    return [];
  }
  // El protocolo de MariaDB puede devolver DATE como Date: fijar ISO evita depender
  // de la zona horaria del proceso y mantiene el contrato de fecha sin hora.
  const revision = table === "resource_revision_characteristics" ? "revisionId," : "";

  return database.query<CharacteristicRow>(
    `SELECT ${revision}resourceId,fieldId,valueType,textValue,numberValue,booleanValue,DATE_FORMAT(dateValue,'%Y-%m-%d') AS dateValue FROM ${sqlIdentifier(table)} WHERE resourceId IN (:ids)`,
    { replacements: { ids }, type: QueryTypes.SELECT, transaction }
  );
}