tables.ts

import type { Literal, MigrationOptions } from '../types';
import {
  applyType,
  applyTypeAdapters,
  escapeValue,
  formatLines,
  intersection,
  makeComment,
} from '../utils';
import type { FunctionParamType } from './functionsTypes';
import type { Name } from './generalTypes';
import { parseSequenceOptions } from './sequences';
import type {
  AddColumns,
  AlterColumn,
  AlterTable,
  ColumnDefinition,
  ColumnDefinitions,
  ConstraintOptions,
  CreateConstraint,
  CreateTable,
  DropColumns,
  DropConstraint,
  DropTable,
  Like,
  LikeOptions,
  ReferencesOptions,
  RenameColumn,
  RenameConstraint,
  RenameTable,
} from './tablesTypes';

export type {
  CreateTable,
  DropTable,
  AlterTable,
  RenameTable,
  AddColumns,
  DropColumns,
  AlterColumn,
  RenameColumn,
  CreateConstraint,
  DropConstraint,
  RenameConstraint,
};

const parseReferences = (options: ReferencesOptions, literal: Literal) => {
  const { references, match, onDelete, onUpdate } = options;

  const clauses: string[] = [];

  clauses.push(
    typeof references === 'string' &&
      (references.startsWith('"') || references.endsWith(')'))
      ? `REFERENCES ${references}`
      : `REFERENCES ${literal(references)}`
  );

  if (match) {
    clauses.push(`MATCH ${match}`);
  }

  if (onDelete) {
    clauses.push(`ON DELETE ${onDelete}`);
  }

  if (onUpdate) {
    clauses.push(`ON UPDATE ${onUpdate}`);
  }

  return clauses.join(' ');
};

const parseDeferrable = (options: { deferred?: boolean }) =>
  `DEFERRABLE INITIALLY ${options.deferred ? 'DEFERRED' : 'IMMEDIATE'}`;

const parseColumns = (
  tableName: Name,
  columns: ColumnDefinitions,
  mOptions: MigrationOptions
): {
  columns: string[];
  constraints: ConstraintOptions;
  comments: string[];
} => {
  const extendingTypeShorthands = mOptions.typeShorthands;

  let columnsWithOptions = Object.keys(columns).reduce<{
    [x: string]: ColumnDefinition & FunctionParamType;
  }>(
    (previous, column) => ({
      ...previous,
      [column]: applyType(columns[column], extendingTypeShorthands),
    }),
    {}
  );

  const primaryColumns = Object.entries(columnsWithOptions)
    .filter(([, { primaryKey }]) => Boolean(primaryKey))
    .map(([columnName]) => columnName);
  const multiplePrimaryColumns = primaryColumns.length > 1;

  if (multiplePrimaryColumns) {
    columnsWithOptions = Object.entries(columnsWithOptions).reduce(
      (previous, [columnName, options]) => ({
        ...previous,
        [columnName]: {
          ...options,
          primaryKey: false,
        },
      }),
      {}
    );
  }

  const comments = Object.entries(columnsWithOptions)
    .map(([columnName, { comment }]) => {
      return (
        typeof comment !== 'undefined' &&
        makeComment(
          'COLUMN',
          `${mOptions.literal(tableName)}.${mOptions.literal(columnName)}`,
          comment
        )
      );
    })
    .filter((comment): comment is string => Boolean(comment));

  return {
    columns: Object.entries(columnsWithOptions).map(([columnName, options]) => {
      const {
        type,
        collation,
        default: defaultValue,
        unique,
        primaryKey,
        notNull,
        check,
        references,
        referencesConstraintName,
        referencesConstraintComment,
        deferrable,
        expressionGenerated,
      }: ColumnDefinition = options;

      const sequenceGenerated =
        options.sequenceGenerated === undefined
          ? options.generated
          : options.sequenceGenerated;
      const constraints: string[] = [];

      if (collation) {
        constraints.push(`COLLATE ${collation}`);
      }

      if (defaultValue !== undefined) {
        constraints.push(`DEFAULT ${escapeValue(defaultValue)}`);
      }

      if (unique) {
        constraints.push('UNIQUE');
      }

      if (primaryKey) {
        constraints.push('PRIMARY KEY');
      }

      if (notNull) {
        constraints.push('NOT NULL');
      }

      if (check) {
        constraints.push(`CHECK (${check})`);
      }

      if (references) {
        const name =
          referencesConstraintName ||
          (referencesConstraintComment ? `${tableName}_fk_${columnName}` : '');
        const constraintName = name
          ? `CONSTRAINT ${mOptions.literal(name)} `
          : '';
        constraints.push(
          `${constraintName}${parseReferences(options as ReferencesOptions, mOptions.literal)}`
        );

        if (referencesConstraintComment) {
          comments.push(
            makeComment(
              `CONSTRAINT ${mOptions.literal(name)} ON`,
              mOptions.literal(tableName),
              referencesConstraintComment
            )
          );
        }
      }

      if (deferrable) {
        constraints.push(parseDeferrable(options));
      }

      if (sequenceGenerated) {
        const sequenceOptions = parseSequenceOptions(
          extendingTypeShorthands,
          sequenceGenerated
        ).join(' ');
        constraints.push(
          `GENERATED ${sequenceGenerated.precedence} AS IDENTITY${sequenceOptions ? ` (${sequenceOptions})` : ''}`
        );
      }

      if (expressionGenerated) {
        constraints.push(`GENERATED ALWAYS AS (${expressionGenerated}) STORED`);
      }

      const constraintsStr = constraints.length
        ? ` ${constraints.join(' ')}`
        : '';

      const sType = typeof type === 'object' ? mOptions.literal(type) : type;

      return `${mOptions.literal(columnName)} ${sType}${constraintsStr}`;
    }),
    constraints: multiplePrimaryColumns ? { primaryKey: primaryColumns } : {},
    comments,
  };
};

const parseConstraints = (
  table: Name,
  options: ConstraintOptions,
  optionName: string | null,
  literal: Literal
) => {
  const {
    check,
    unique,
    primaryKey,
    foreignKeys,
    exclude,
    deferrable,
    comment,
  }: ConstraintOptions = options;

  const tableName = typeof table === 'object' ? table.name : table;

  let constraints: string[] = [];
  const comments: string[] = [];

  if (check) {
    if (Array.isArray(check)) {
      check.forEach((ch, i) => {
        const name = literal(optionName || `${tableName}_chck_${i + 1}`);
        constraints.push(`CONSTRAINT ${name} CHECK (${ch})`);
      });
    } else {
      const name = literal(optionName || `${tableName}_chck`);
      constraints.push(`CONSTRAINT ${name} CHECK (${check})`);
    }
  }

  if (unique) {
    const uniqueArray: Array<Name | Name[]> = Array.isArray(unique)
      ? unique
      : [unique];
    const isArrayOfArrays = uniqueArray.some((uniqueSet) =>
      Array.isArray(uniqueSet)
    );

    (
      (isArrayOfArrays ? uniqueArray : [uniqueArray]) as Array<Name | Name[]>
    ).forEach((uniqueSet) => {
      const cols = Array.isArray(uniqueSet) ? uniqueSet : [uniqueSet];
      const name = literal(optionName || `${tableName}_uniq_${cols.join('_')}`);

      constraints.push(
        `CONSTRAINT ${name} UNIQUE (${cols.map(literal).join(', ')})`
      );
    });
  }

  if (primaryKey) {
    const name = literal(optionName || `${tableName}_pkey`);
    const key = (Array.isArray(primaryKey) ? primaryKey : [primaryKey])
      .map(literal)
      .join(', ');

    constraints.push(`CONSTRAINT ${name} PRIMARY KEY (${key})`);
  }

  if (foreignKeys) {
    (Array.isArray(foreignKeys) ? foreignKeys : [foreignKeys]).forEach((fk) => {
      const { columns, referencesConstraintName, referencesConstraintComment } =
        fk;

      const cols = Array.isArray(columns) ? columns : [columns];
      const name = literal(
        referencesConstraintName ||
          optionName ||
          `${tableName}_fk_${cols.join('_')}`
      );
      const key = cols.map(literal).join(', ');
      const referencesStr = parseReferences(fk, literal);

      constraints.push(
        `CONSTRAINT ${name} FOREIGN KEY (${key}) ${referencesStr}`
      );

      if (referencesConstraintComment) {
        comments.push(
          makeComment(
            `CONSTRAINT ${name} ON`,
            literal(tableName),
            referencesConstraintComment
          )
        );
      }
    });
  }

  if (exclude) {
    const name = literal(optionName || `${tableName}_excl`);
    constraints.push(`CONSTRAINT ${name} EXCLUDE ${exclude}`);
  }

  if (deferrable) {
    constraints = constraints.map(
      (constraint) => `${constraint} ${parseDeferrable(options)}`
    );
  }

  if (comment) {
    if (!optionName) {
      throw new Error('cannot comment on unspecified constraints');
    }

    comments.push(
      makeComment(
        `CONSTRAINT ${literal(optionName)} ON`,
        literal(tableName),
        comment
      )
    );
  }

  return {
    constraints,
    comments,
  };
};

const parseLike = (
  like: Name | { table: Name; options?: LikeOptions },
  literal: Literal
) => {
  const formatOptions = (
    name: 'INCLUDING' | 'EXCLUDING',
    options?: Like | Like[]
  ) =>
    (Array.isArray(options) ? options : [options])
      .filter((option): option is Like => option !== undefined)
      .map((option) => ` ${name} ${option}`)
      .join('');

  const table =
    typeof like === 'string' || !('table' in like) ? like : like.table;
  const options =
    typeof like === 'string' ||
    !('options' in like) ||
    like.options === undefined
      ? ''
      : [
          formatOptions('INCLUDING', like.options.including),
          formatOptions('EXCLUDING', like.options.excluding),
        ].join('');

  return `LIKE ${literal(table)}${options}`;
};

export function dropTable(mOptions: MigrationOptions): DropTable {
  const _drop: DropTable = (tableName, options = {}) => {
    const { ifExists, cascade } = options;

    const ifExistsStr = ifExists ? ' IF EXISTS' : '';
    const cascadeStr = cascade ? ' CASCADE' : '';
    const tableNameStr = mOptions.literal(tableName);

    return `DROP TABLE${ifExistsStr} ${tableNameStr}${cascadeStr};`;
  };

  return _drop;
}

export function createTable(mOptions: MigrationOptions): CreateTable {
  const _create: CreateTable = (tableName, columns, options = {}) => {
    const {
      temporary,
      ifNotExists,
      inherits,
      like,
      constraints: optionsConstraints = {},
      comment,
    } = options;

    const {
      columns: columnLines,
      constraints: crossColumnConstraints,
      comments: columnComments = [],
    } = parseColumns(tableName, columns, mOptions);

    const dupes = intersection(
      Object.keys(optionsConstraints),
      Object.keys(crossColumnConstraints)
    );

    if (dupes.length > 0) {
      const dupesStr = dupes.join(', ');
      throw new Error(
        `There is duplicate constraint definition in table and columns options: ${dupesStr}`
      );
    }

    const constraints: ConstraintOptions = {
      ...optionsConstraints,
      ...crossColumnConstraints,
    };
    const { constraints: constraintLines, comments: constraintComments } =
      parseConstraints(tableName, constraints, '', mOptions.literal);
    const tableDefinition = [...columnLines, ...constraintLines].concat(
      like ? [parseLike(like, mOptions.literal)] : []
    );

    const temporaryStr = temporary ? ' TEMPORARY' : '';
    const ifNotExistsStr = ifNotExists ? ' IF NOT EXISTS' : '';
    const inheritsStr = inherits
      ? ` INHERITS (${mOptions.literal(inherits)})`
      : '';
    const tableNameStr = mOptions.literal(tableName);

    const createTableQuery = `CREATE${temporaryStr} TABLE${ifNotExistsStr} ${tableNameStr} (
${formatLines(tableDefinition)}
)${inheritsStr};`;
    const comments = [...columnComments, ...constraintComments];

    if (typeof comment !== 'undefined') {
      comments.push(makeComment('TABLE', mOptions.literal(tableName), comment));
    }

    return `${createTableQuery}${comments.length > 0 ? `\n${comments.join('\n')}` : ''}`;
  };

  _create.reverse = dropTable(mOptions);

  return _create;
}

export function alterTable(mOptions: MigrationOptions): AlterTable {
  const _alter: AlterTable = (tableName, options) => {
    const alterDefinition: string[] = [];

    if (options.levelSecurity) {
      alterDefinition.push(`${options.levelSecurity} ROW LEVEL SECURITY`);
    }

    return `ALTER TABLE ${mOptions.literal(tableName)}
  ${formatLines(alterDefinition)};`;
  };

  return _alter;
}

export function dropColumns(mOptions: MigrationOptions): DropColumns {
  const _drop: DropColumns = (tableName, columns, options = {}) => {
    const { ifExists, cascade } = options;

    if (typeof columns === 'string') {
      columns = [columns];
    } else if (!Array.isArray(columns) && typeof columns === 'object') {
      columns = Object.keys(columns);
    }

    const columnsStr = formatLines(
      columns.map(mOptions.literal),
      `  DROP ${ifExists ? 'IF EXISTS ' : ''}`,
      `${cascade ? ' CASCADE' : ''},`
    );

    return `ALTER TABLE ${mOptions.literal(tableName)}
${columnsStr};`;
  };

  return _drop;
}

export function addColumns(mOptions: MigrationOptions): AddColumns {
  const _add: AddColumns = (tableName, columns, options = {}) => {
    const { ifNotExists } = options;

    const { columns: columnLines, comments: columnComments = [] } =
      parseColumns(tableName, columns, mOptions);
    const columnsStr = formatLines(
      columnLines,
      `  ADD ${ifNotExists ? 'IF NOT EXISTS ' : ''}`
    );
    const tableNameStr = mOptions.literal(tableName);
    const alterTableQuery = `ALTER TABLE ${tableNameStr}\n${columnsStr};`;
    const columnCommentsStr =
      columnComments.length > 0 ? `\n${columnComments.join('\n')}` : '';

    return `${alterTableQuery}${columnCommentsStr}`;
  };

  _add.reverse = dropColumns(mOptions);

  return _add;
}

export function alterColumn(mOptions: MigrationOptions): AlterColumn {
  return (tableName, columnName, options) => {
    const {
      default: defaultValue,
      type,
      collation,
      using,
      notNull,
      allowNull,
      comment,
    } = options;

    const sequenceGenerated =
      options.sequenceGenerated === undefined
        ? options.generated
        : options.sequenceGenerated;

    const actions: string[] = [];

    if (defaultValue === null) {
      actions.push('DROP DEFAULT');
    } else if (defaultValue !== undefined) {
      actions.push(`SET DEFAULT ${escapeValue(defaultValue)}`);
    }

    if (type) {
      const typeStr = applyTypeAdapters(type);
      const collationStr = collation ? ` COLLATE ${collation}` : '';
      const usingStr = using ? ` USING ${using}` : '';

      actions.push(`SET DATA TYPE ${typeStr}${collationStr}${usingStr}`);
    }

    if (notNull) {
      actions.push('SET NOT NULL');
    } else if (notNull === false || allowNull) {
      actions.push('DROP NOT NULL');
    }

    if (sequenceGenerated !== undefined) {
      if (!sequenceGenerated) {
        actions.push('DROP IDENTITY');
      } else {
        const sequenceOptions = parseSequenceOptions(
          mOptions.typeShorthands,
          sequenceGenerated
        ).join(' ');

        actions.push(
          `ADD GENERATED ${sequenceGenerated.precedence} AS IDENTITY${sequenceOptions ? ` (${sequenceOptions})` : ''}`
        );
      }
    }

    const queries: string[] = [];

    if (actions.length > 0) {
      const columnsStr = formatLines(
        actions,
        `  ALTER ${mOptions.literal(columnName)} `
      );

      queries.push(
        `ALTER TABLE ${mOptions.literal(tableName)}\n${columnsStr};`
      );
    }

    if (typeof comment !== 'undefined') {
      queries.push(
        makeComment(
          'COLUMN',
          `${mOptions.literal(tableName)}.${mOptions.literal(columnName)}`,
          comment
        )
      );
    }

    return queries.join('\n');
  };
}

export function renameTable(mOptions: MigrationOptions): RenameTable {
  const _rename: RenameTable = (tableName, newName) => {
    const tableNameStr = mOptions.literal(tableName);
    const newNameStr = mOptions.literal(newName);

    return `ALTER TABLE ${tableNameStr} RENAME TO ${newNameStr};`;
  };

  _rename.reverse = (tableName, newName) => _rename(newName, tableName);

  return _rename;
}

export function renameColumn(mOptions: MigrationOptions): RenameColumn {
  const _rename: RenameColumn = (tableName, columnName, newName) => {
    const tableNameStr = mOptions.literal(tableName);
    const columnNameStr = mOptions.literal(columnName);
    const newNameStr = mOptions.literal(newName);

    return `ALTER TABLE ${tableNameStr} RENAME ${columnNameStr} TO ${newNameStr};`;
  };

  _rename.reverse = (tableName, columnName, newName) =>
    _rename(tableName, newName, columnName);

  return _rename;
}

export function renameConstraint(mOptions: MigrationOptions): RenameConstraint {
  const _rename: RenameConstraint = (tableName, constraintName, newName) => {
    const tableNameStr = mOptions.literal(tableName);
    const constraintNameStr = mOptions.literal(constraintName);
    const newNameStr = mOptions.literal(newName);

    return `ALTER TABLE ${tableNameStr} RENAME CONSTRAINT ${constraintNameStr} TO ${newNameStr};`;
  };

  _rename.reverse = (tableName, constraintName, newName) =>
    _rename(tableName, newName, constraintName);

  return _rename;
}

export function dropConstraint(mOptions: MigrationOptions): DropConstraint {
  const _drop: DropConstraint = (tableName, constraintName, options = {}) => {
    const { ifExists, cascade } = options;

    const ifExistsStr = ifExists ? ' IF EXISTS' : '';
    const cascadeStr = cascade ? ' CASCADE' : '';
    const tableNameStr = mOptions.literal(tableName);
    const constraintNameStr = mOptions.literal(constraintName);

    return `ALTER TABLE ${tableNameStr} DROP CONSTRAINT${ifExistsStr} ${constraintNameStr}${cascadeStr};`;
  };

  return _drop;
}

export function addConstraint(mOptions: MigrationOptions): CreateConstraint {
  const _add: CreateConstraint = (tableName, constraintName, expression) => {
    const { constraints, comments } =
      typeof expression === 'string'
        ? {
            constraints: [
              `${constraintName ? `CONSTRAINT ${mOptions.literal(constraintName)} ` : ''}${expression}`,
            ],
            comments: [],
          }
        : parseConstraints(
            tableName,
            expression,
            constraintName,
            mOptions.literal
          );

    const constraintStr = formatLines(constraints, '  ADD ');

    return [
      `ALTER TABLE ${mOptions.literal(tableName)}\n${constraintStr};`,
      ...comments,
    ].join('\n');
  };

  _add.reverse = (tableName, constraintName, options) => {
    if (constraintName === null) {
      throw new Error(
        'Impossible to automatically infer down migration for addConstraint without naming constraint'
      );
    }

    return dropConstraint(mOptions)(tableName, constraintName, options);
  };

  return _add;
}