/**
 * Tests for the FOL compiler's cross-package compatibility.
 *
 * Verifies that duck-type checks replace instanceof so that assertions
 * compile correctly when packages are symlinked or duplicated.
 */

import { describe, it } from 'node:test'
import assert from 'node:assert'
import { compileAssertionsToFOL } from './fol-compiler.js'

describe('fol-compiler duck-type compilation', () => {
  it('compiles a plain object resembling FluentRelation', () => {
    const plainRelation = {
      relation: 'leftOf',
      assertion: {
        getSubject: () => '.a',
        getQuantifier: () => 'all',
      },
      referenceSelector: '.b',
      options: { minGap: 8 },
    }
    const formula = compileAssertionsToFOL([plainRelation as any])
    assert.ok(formula !== null, 'Plain object FluentRelation should compile to a formula')
    assert.strictEqual(formula?.kind, 'forall')
  })

  it('compiles a plain object resembling FluentQuantifier', () => {
    const plainQuantifier = {
      bindings: [{ selector: '.item' }],
      toFormula: () => ({
        type: 'FormulaNode',
        kind: 'forall',
        bindings: [],
        body: { type: 'FormulaNode', kind: 'predicate', predicate: 'true', args: [] },
      }),
    }
    const formula = compileAssertionsToFOL([plainQuantifier as any])
    assert.ok(formula !== null, 'Plain object FluentQuantifier should compile to a formula')
  })

  it('ignores objects that do not duck-type as FluentRelation or FluentQuantifier', () => {
    const plainObj = { foo: 'bar' }
    const formula = compileAssertionsToFOL([plainObj as any])
    assert.strictEqual(formula, null)
  })

  it('rejects null and primitive values', () => {
    assert.strictEqual(compileAssertionsToFOL([null as any]), null)
    assert.strictEqual(compileAssertionsToFOL([42 as any]), null)
    assert.strictEqual(compileAssertionsToFOL(['string' as any]), null)
  })

  it('adapts grammar.ts ForAll shape to logic-ast.ts shape', () => {
    const grammarForAll = {
      bindings: [{ selector: '.item' }],
      toFormula: () => ({
        type: 'ForAll',
        variable: { type: 'VariableRef', name: '$x' },
        domain: { type: 'DomainRef', kind: 'elements', selector: '.item' },
        body: {
          type: 'PredicateCall',
          name: 'leftOf',
          args: [{ type: 'VariableRef', name: '$x' }],
        },
      }),
    }
    const formula = compileAssertionsToFOL([grammarForAll as any])
    assert.ok(formula !== null)
    assert.strictEqual(formula!.kind, 'forall')
    assert.strictEqual((formula as any).bindings[0].variables[0], '$x')
    assert.strictEqual((formula as any).bindings[0].domain.domain, 'elements')
    assert.strictEqual((formula as any).body.kind, 'predicate')
    assert.strictEqual((formula as any).body.predicate, 'leftOf')
  })

  it('adapts grammar.ts Exists shape to logic-ast.ts shape', () => {
    const grammarExists = {
      bindings: [{ selector: '.item' }],
      toFormula: () => ({
        type: 'Exists',
        variable: { type: 'VariableRef', name: '$y' },
        domain: { type: 'DomainRef', kind: 'elements', selector: '.item' },
        body: {
          type: 'PredicateCall',
          name: 'above',
          args: [{ type: 'VariableRef', name: '$y' }],
        },
      }),
    }
    const formula = compileAssertionsToFOL([grammarExists as any])
    assert.ok(formula !== null)
    assert.strictEqual(formula!.kind, 'exists')
  })

  it('adapts grammar.ts And shape to logic-ast.ts shape', () => {
    const grammarAnd = {
      bindings: [{ selector: '.item' }],
      toFormula: () => ({
        type: 'And',
        left: {
          type: 'PredicateCall',
          name: 'leftOf',
          args: [{ type: 'VariableRef', name: '$x' }],
        },
        right: {
          type: 'PredicateCall',
          name: 'above',
          args: [{ type: 'VariableRef', name: '$x' }],
        },
      }),
    }
    const formula = compileAssertionsToFOL([grammarAnd as any])
    assert.ok(formula !== null)
    assert.strictEqual(formula!.kind, 'and')
    assert.strictEqual((formula as any).left.kind, 'predicate')
    assert.strictEqual((formula as any).right.kind, 'predicate')
  })

  it('adapts grammar.ts Not shape to logic-ast.ts shape', () => {
    const grammarNot = {
      bindings: [{ selector: '.item' }],
      toFormula: () => ({
        type: 'Not',
        operand: {
          type: 'PredicateCall',
          name: 'overlaps',
          args: [{ type: 'VariableRef', name: '$x' }],
        },
      }),
    }
    const formula = compileAssertionsToFOL([grammarNot as any])
    assert.ok(formula !== null)
    assert.strictEqual(formula!.kind, 'not')
    assert.strictEqual((formula as any).operand.kind, 'predicate')
  })

  it('adapts grammar.ts Implies shape to logic-ast.ts shape', () => {
    const grammarImplies = {
      bindings: [{ selector: '.item' }],
      toFormula: () => ({
        type: 'Implies',
        left: {
          type: 'PredicateCall',
          name: 'inside',
          args: [{ type: 'VariableRef', name: '$x' }],
        },
        right: {
          type: 'PredicateCall',
          name: 'alignedWith',
          args: [{ type: 'VariableRef', name: '$x' }],
        },
      }),
    }
    const formula = compileAssertionsToFOL([grammarImplies as any])
    assert.ok(formula !== null)
    assert.strictEqual(formula!.kind, 'implies')
    assert.strictEqual((formula as any).antecedent.kind, 'predicate')
    assert.strictEqual((formula as any).consequent.kind, 'predicate')
  })

  it('adapts deeply nested grammar.ts shape', () => {
    const grammarNested = {
      bindings: [{ selector: '.item' }],
      toFormula: () => ({
        type: 'ForAll',
        variable: { type: 'VariableRef', name: '$x' },
        domain: { type: 'DomainRef', kind: 'elements', selector: '.item' },
        body: {
          type: 'And',
          left: {
            type: 'Not',
            operand: {
              type: 'PredicateCall',
              name: 'overlaps',
              args: [{ type: 'VariableRef', name: '$x' }],
            },
          },
          right: {
            type: 'Exists',
            variable: { type: 'VariableRef', name: '$y' },
            domain: { type: 'DomainRef', kind: 'elements', selector: '.ref' },
            body: {
              type: 'PredicateCall',
              name: 'leftOf',
              args: [
                { type: 'VariableRef', name: '$x' },
                { type: 'VariableRef', name: '$y' },
              ],
            },
          },
        },
      }),
    }
    const formula = compileAssertionsToFOL([grammarNested as any])
    assert.ok(formula !== null)
    assert.strictEqual(formula!.kind, 'forall')
    const body = (formula as any).body
    assert.strictEqual(body.kind, 'and')
    assert.strictEqual(body.left.kind, 'not')
    assert.strictEqual(body.right.kind, 'exists')
    assert.strictEqual(body.right.body.kind, 'predicate')
    assert.strictEqual(body.right.body.args.length, 2)
  })

  it('passes through already-correct logic-ast.ts shape', () => {
    const logicAstForAll = {
      bindings: [{ selector: '.item' }],
      toFormula: () => ({
        type: 'FormulaNode',
        kind: 'forall',
        bindings: [
          {
            type: 'TupleBinding',
            variables: ['$x'],
            domain: { type: 'DomainRef', domain: 'elements', selector: '.item' },
          },
        ],
        body: { type: 'FormulaNode', kind: 'predicate', predicate: 'true', args: [] },
      }),
    }
    const formula = compileAssertionsToFOL([logicAstForAll as any])
    assert.ok(formula !== null)
    assert.strictEqual(formula!.kind, 'forall')
  })

  it('compiles mixed arrays of plain objects', () => {
    const plainRelation = {
      relation: 'above',
      assertion: {
        getSubject: () => '.c',
        getQuantifier: () => 'all',
      },
      referenceSelector: '.d',
      options: { minGap: 4 },
    }
    const plainQuantifier = {
      bindings: [{ selector: '.x' }],
      toFormula: () => ({
        type: 'FormulaNode',
        kind: 'exists',
        bindings: [],
        body: { type: 'FormulaNode', kind: 'predicate', predicate: 'true', args: [] },
      }),
    }
    const formula = compileAssertionsToFOL([plainRelation as any, plainQuantifier as any])
    assert.ok(formula !== null)
    assert.strictEqual(formula?.kind, 'and')
  })

  it('propagates assertion layout space to simple relations', () => {
    const relation = {
      relation: 'leftOf',
      assertion: {
        getSubject: () => '.a',
        getQuantifier: () => 'all',
        getSpace: () => 'layout',
      },
      referenceSelector: '.b',
      options: {},
    }

    const formula = compileAssertionsToFOL([relation as any]) as any
    const predicate = formula.body
    assert.strictEqual(predicate.kind, 'predicate')
    assert.strictEqual(predicate.options.space, 'layout')
  })

  it('propagates assertion visual space to compound relations', () => {
    const relation = {
      relation: 'above',
      assertion: {
        getSubject: () => '.a',
        getQuantifier: () => 'all',
        getSpace: () => 'visual',
      },
      referenceSelector: '.c',
      options: {},
      _compoundOperator: 'and',
      _compoundParts: [
        { relation: 'leftOf', referenceSelector: '.b', options: {} },
        { relation: 'above', referenceSelector: '.c', options: {} },
      ],
    }

    const formula = compileAssertionsToFOL([relation as any]) as any
    assert.strictEqual(formula.kind, 'forall')
    const andBody = formula.body
    assert.strictEqual(andBody.kind, 'and')
    assert.strictEqual(andBody.left.body.options.space, 'visual')
    assert.strictEqual(andBody.right.body.options.space, 'visual')
  })
})