import { describe, it, expect } from 'bun:test';
import { parseExpectedColumns, simplifyColumnDef } from '../src/core/schema-verify.ts';

describe('parseExpectedColumns', () => {
  it('extracts columns from all major tables', () => {
    const columns = parseExpectedColumns();

    // Should find columns from known tables
    const tables = new Set(columns.map(c => c.table));
    expect(tables.has('pages')).toBe(true);
    expect(tables.has('content_chunks')).toBe(true);
    expect(tables.has('links')).toBe(true);
    expect(tables.has('sources')).toBe(true);
    expect(tables.has('minion_jobs')).toBe(true);
    expect(tables.has('files')).toBe(true);

    // Should find specific columns that have historically been missed by PgBouncer
    const columnKeys = new Set(columns.map(c => `${c.table}.${c.column}`));
    expect(columnKeys.has('content_chunks.symbol_type')).toBe(true);
    expect(columnKeys.has('content_chunks.start_line')).toBe(true);
    expect(columnKeys.has('content_chunks.end_line')).toBe(true);
    expect(columnKeys.has('content_chunks.parent_symbol_path')).toBe(true);
    expect(columnKeys.has('content_chunks.doc_comment')).toBe(true);
    expect(columnKeys.has('content_chunks.symbol_name_qualified')).toBe(true);
    expect(columnKeys.has('content_chunks.search_vector')).toBe(true);

    // pages columns
    expect(columnKeys.has('pages.slug')).toBe(true);
    expect(columnKeys.has('pages.source_id')).toBe(true);
    expect(columnKeys.has('pages.page_kind')).toBe(true);
    expect(columnKeys.has('pages.search_vector')).toBe(true);

    // sources columns
    expect(columnKeys.has('sources.chunker_version')).toBe(true);
  });

  it('does not include CONSTRAINT lines as columns', () => {
    const columns = parseExpectedColumns();
    const colNames = columns.map(c => c.column);

    // These are constraint names, not column names
    expect(colNames).not.toContain('constraint');
    expect(colNames).not.toContain('unique');
    expect(colNames).not.toContain('check');
    expect(colNames).not.toContain('primary');
    expect(colNames).not.toContain('foreign');
  });

  it('returns non-empty definitions for all columns', () => {
    const columns = parseExpectedColumns();
    for (const col of columns) {
      expect(col.definition.length).toBeGreaterThan(0);
    }
  });
});

describe('simplifyColumnDef', () => {
  it('strips REFERENCES clauses', () => {
    const result = simplifyColumnDef(
      "TEXT NOT NULL DEFAULT 'default' REFERENCES sources(id) ON DELETE CASCADE"
    );
    expect(result).toBe("TEXT NOT NULL DEFAULT 'default'");
  });

  it('strips CHECK constraints', () => {
    const result = simplifyColumnDef(
      "TEXT NOT NULL DEFAULT 'markdown' CHECK (page_kind IN ('markdown','code'))"
    );
    expect(result).toBe("TEXT NOT NULL DEFAULT 'markdown'");
  });

  it('preserves simple type + NOT NULL + DEFAULT', () => {
    const result = simplifyColumnDef("INTEGER NOT NULL DEFAULT 0");
    expect(result).toBe("INTEGER NOT NULL DEFAULT 0");
  });

  it('strips UNIQUE keyword', () => {
    const result = simplifyColumnDef("TEXT NOT NULL UNIQUE");
    expect(result).toBe("TEXT NOT NULL");
  });

  it('handles complex REFERENCES with ON DELETE and ON UPDATE', () => {
    const result = simplifyColumnDef(
      "INTEGER NOT NULL REFERENCES pages(id) ON DELETE CASCADE"
    );
    expect(result).toBe("INTEGER NOT NULL");
  });

  it('handles bare type', () => {
    const result = simplifyColumnDef("TEXT");
    expect(result).toBe("TEXT");
  });

  it('handles vector type', () => {
    const result = simplifyColumnDef("vector(1536)");
    expect(result).toBe("vector(1536)");
  });

  it('handles TSVECTOR type', () => {
    const result = simplifyColumnDef("TSVECTOR");
    expect(result).toBe("TSVECTOR");
  });

  it('handles array types', () => {
    const result = simplifyColumnDef("TEXT[]");
    expect(result).toBe("TEXT[]");
  });
});