import { isTable, Table } from "./table.js";
import { Column } from "./column.js";
import { entityKind, is } from "./entity.js";
import { PrimaryKeyBuilder } from "./pg-core/primary-keys.js";
import {
  and,
  asc,
  between,
  desc,
  eq,
  exists,
  gt,
  gte,
  ilike,
  inArray,
  isNotNull,
  isNull,
  like,
  lt,
  lte,
  ne,
  not,
  notBetween,
  notExists,
  notIlike,
  notInArray,
  notLike,
  or
} from "./sql/expressions/index.js";
import { SQL, sql } from "./sql/sql.js";
class Relation {
  constructor(sourceTable, referencedTable, relationName) {
    this.sourceTable = sourceTable;
    this.referencedTable = referencedTable;
    this.relationName = relationName;
    this.referencedTableName = referencedTable[Table.Symbol.Name];
  }
  static [entityKind] = "Relation";
  referencedTableName;
  fieldName;
}
class Relations {
  constructor(table, config) {
    this.table = table;
    this.config = config;
  }
  static [entityKind] = "Relations";
}
class One extends Relation {
  constructor(sourceTable, referencedTable, config, isNullable) {
    super(sourceTable, referencedTable, config?.relationName);
    this.config = config;
    this.isNullable = isNullable;
  }
  static [entityKind] = "One";
  withFieldName(fieldName) {
    const relation = new One(
      this.sourceTable,
      this.referencedTable,
      this.config,
      this.isNullable
    );
    relation.fieldName = fieldName;
    return relation;
  }
}
class Many extends Relation {
  constructor(sourceTable, referencedTable, config) {
    super(sourceTable, referencedTable, config?.relationName);
    this.config = config;
  }
  static [entityKind] = "Many";
  withFieldName(fieldName) {
    const relation = new Many(
      this.sourceTable,
      this.referencedTable,
      this.config
    );
    relation.fieldName = fieldName;
    return relation;
  }
}
function getOperators() {
  return {
    and,
    between,
    eq,
    exists,
    gt,
    gte,
    ilike,
    inArray,
    isNull,
    isNotNull,
    like,
    lt,
    lte,
    ne,
    not,
    notBetween,
    notExists,
    notLike,
    notIlike,
    notInArray,
    or,
    sql
  };
}
function getOrderByOperators() {
  return {
    sql,
    asc,
    desc
  };
}
function extractTablesRelationalConfig(schema, configHelpers) {
  if (Object.keys(schema).length === 1 && "default" in schema && !is(schema["default"], Table)) {
    schema = schema["default"];
  }
  const tableNamesMap = {};
  const relationsBuffer = {};
  const tablesConfig = {};
  for (const [key, value] of Object.entries(schema)) {
    if (isTable(value)) {
      const dbName = value[Table.Symbol.Name];
      const bufferedRelations = relationsBuffer[dbName];
      tableNamesMap[dbName] = key;
      tablesConfig[key] = {
        tsName: key,
        dbName: value[Table.Symbol.Name],
        schema: value[Table.Symbol.Schema],
        columns: value[Table.Symbol.Columns],
        relations: bufferedRelations?.relations ?? {},
        primaryKey: bufferedRelations?.primaryKey ?? []
      };
      for (const column of Object.values(
        value[Table.Symbol.Columns]
      )) {
        if (column.primary) {
          tablesConfig[key].primaryKey.push(column);
        }
      }
      const extraConfig = value[Table.Symbol.ExtraConfigBuilder]?.(value[Table.Symbol.ExtraConfigColumns]);
      if (extraConfig) {
        for (const configEntry of Object.values(extraConfig)) {
          if (is(configEntry, PrimaryKeyBuilder)) {
            tablesConfig[key].primaryKey.push(...configEntry.columns);
          }
        }
      }
    } else if (is(value, Relations)) {
      const dbName = value.table[Table.Symbol.Name];
      const tableName = tableNamesMap[dbName];
      const relations2 = value.config(
        configHelpers(value.table)
      );
      let primaryKey;
      for (const [relationName, relation] of Object.entries(relations2)) {
        if (tableName) {
          const tableConfig = tablesConfig[tableName];
          tableConfig.relations[relationName] = relation;
          if (primaryKey) {
            tableConfig.primaryKey.push(...primaryKey);
          }
        } else {
          if (!(dbName in relationsBuffer)) {
            relationsBuffer[dbName] = {
              relations: {},
              primaryKey
            };
          }
          relationsBuffer[dbName].relations[relationName] = relation;
        }
      }
    }
  }
  return { tables: tablesConfig, tableNamesMap };
}
function relations(table, relations2) {
  return new Relations(
    table,
    (helpers) => Object.fromEntries(
      Object.entries(relations2(helpers)).map(([key, value]) => [
        key,
        value.withFieldName(key)
      ])
    )
  );
}
function createOne(sourceTable) {
  return function one(table, config) {
    return new One(
      sourceTable,
      table,
      config,
      config?.fields.reduce((res, f) => res && f.notNull, true) ?? false
    );
  };
}
function createMany(sourceTable) {
  return function many(referencedTable, config) {
    return new Many(sourceTable, referencedTable, config);
  };
}
function normalizeRelation(schema, tableNamesMap, relation) {
  if (is(relation, One) && relation.config) {
    return {
      fields: relation.config.fields,
      references: relation.config.references
    };
  }
  const referencedTableTsName = tableNamesMap[relation.referencedTable[Table.Symbol.Name]];
  if (!referencedTableTsName) {
    throw new Error(
      `Table "${relation.referencedTable[Table.Symbol.Name]}" not found in schema`
    );
  }
  const referencedTableConfig = schema[referencedTableTsName];
  if (!referencedTableConfig) {
    throw new Error(`Table "${referencedTableTsName}" not found in schema`);
  }
  const sourceTable = relation.sourceTable;
  const sourceTableTsName = tableNamesMap[sourceTable[Table.Symbol.Name]];
  if (!sourceTableTsName) {
    throw new Error(
      `Table "${sourceTable[Table.Symbol.Name]}" not found in schema`
    );
  }
  const reverseRelations = [];
  for (const referencedTableRelation of Object.values(
    referencedTableConfig.relations
  )) {
    if (relation.relationName && relation !== referencedTableRelation && referencedTableRelation.relationName === relation.relationName || !relation.relationName && referencedTableRelation.referencedTable === relation.sourceTable) {
      reverseRelations.push(referencedTableRelation);
    }
  }
  if (reverseRelations.length > 1) {
    throw relation.relationName ? new Error(
      `There are multiple relations with name "${relation.relationName}" in table "${referencedTableTsName}"`
    ) : new Error(
      `There are multiple relations between "${referencedTableTsName}" and "${relation.sourceTable[Table.Symbol.Name]}". Please specify relation name`
    );
  }
  if (reverseRelations[0] && is(reverseRelations[0], One) && reverseRelations[0].config) {
    return {
      fields: reverseRelations[0].config.references,
      references: reverseRelations[0].config.fields
    };
  }
  throw new Error(
    `There is not enough information to infer relation "${sourceTableTsName}.${relation.fieldName}"`
  );
}
function createTableRelationsHelpers(sourceTable) {
  return {
    one: createOne(sourceTable),
    many: createMany(sourceTable)
  };
}
function mapRelationalRow(tablesConfig, tableConfig, row, buildQueryResultSelection, mapColumnValue = (value) => value) {
  const result = {};
  for (const [
    selectionItemIndex,
    selectionItem
  ] of buildQueryResultSelection.entries()) {
    if (selectionItem.isJson) {
      const relation = tableConfig.relations[selectionItem.tsKey];
      const rawSubRows = row[selectionItemIndex];
      const subRows = typeof rawSubRows === "string" ? JSON.parse(rawSubRows) : rawSubRows;
      result[selectionItem.tsKey] = is(relation, One) ? subRows && mapRelationalRow(
        tablesConfig,
        tablesConfig[selectionItem.relationTableTsKey],
        subRows,
        selectionItem.selection,
        mapColumnValue
      ) : subRows.map(
        (subRow) => mapRelationalRow(
          tablesConfig,
          tablesConfig[selectionItem.relationTableTsKey],
          subRow,
          selectionItem.selection,
          mapColumnValue
        )
      );
    } else {
      const value = mapColumnValue(row[selectionItemIndex]);
      const field = selectionItem.field;
      let decoder;
      if (is(field, Column)) {
        decoder = field;
      } else if (is(field, SQL)) {
        decoder = field.decoder;
      } else {
        decoder = field.sql.decoder;
      }
      result[selectionItem.tsKey] = value === null ? null : decoder.mapFromDriverValue(value);
    }
  }
  return result;
}
export {
  Many,
  One,
  Relation,
  Relations,
  createMany,
  createOne,
  createTableRelationsHelpers,
  extractTablesRelationalConfig,
  getOperators,
  getOrderByOperators,
  mapRelationalRow,
  normalizeRelation,
  relations
};
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