/**
 * Reporter -> Diagnostics integration tests.
 *
 * Verifies that solver results produce correct diagnostics, that proof traces
 * map to human-readable output, and that witness shrinking works end-to-end.
 */

import { describe, it } from 'node:test'
import assert from 'node:assert'
import {
  makeDiagnostic,
  diagnosticFromProof,
  renderHumanReport,
  renderJsonReport,
  buildJsonReport,
  shrinkWitness,
  createTraceBuilder,
  findClauseTraces,
  formatDiagnosticCompact,
} from 'imhotep-reporter'
import type {
  ProofLike,
  Witness,
  ShrinkResult,
} from 'imhotep-reporter'
import { buildMockSolverResult } from './integration-mocks.js'

describe('Reporter -> Diagnostics', () => {
  it('solver results produce correct diagnostics from failing proofs', () => {
    // Arrange: create a failing proof with predicate and witness
    const proof: ProofLike = {
      proofId: 'p1',
      clauseId: 'c1',
      outcome: 'fail',
      truth: 'determinate',
      failedPredicate: { op: '>=', left: 10, right: 24 },
      witness: {
        subjectId: 1,
        referenceId: 2,
        envCaseId: 'env_1',
        snapshotId: 'default',
      },
    }

    // Act: convert proof to diagnostic
    const diagnostic = diagnosticFromProof(proof, {
      idGen: () => 'd1',
      codeForClause: () => 'IMH_RELATION_ABOVE_FAILED',
      messageForClause: () => 'Expected .tooltip to be above .trigger',
      fixHintsForClause: () => ['Increase vertical gap to at least 24px'],
    })

    // Assert
    assert.ok(diagnostic)
    assert.strictEqual(diagnostic!.code, 'IMH_RELATION_ABOVE_FAILED')
    assert.strictEqual(diagnostic!.category, 'contract-failure')
    assert.strictEqual(diagnostic!.severity, 'error')
    assert.ok(
      diagnostic!.related.some((rel) =>
        rel.message.includes('Predicate'),
      ),
    )
    assert.ok(
      diagnostic!.fixHints.some((hint) =>
        hint.includes('gap'),
      ),
    )
  })

  it('indeterminate proofs produce indeterminate-result diagnostics', () => {
    // Arrange: create an indeterminate failing proof
    const proof: ProofLike = {
      proofId: 'p1',
      clauseId: 'c1',
      outcome: 'fail',
      truth: 'indeterminate',
      witness: { envCaseId: 'env_1' },
    }

    // Act
    const diagnostic = diagnosticFromProof(proof, {
      idGen: () => 'd1',
      codeForClause: () => 'IMH_RELATION_ABOVE_FAILED',
      messageForClause: () => 'Could not determine relation',
      fixHintsForClause: () => [],
    })

    // Assert
    assert.ok(diagnostic)
    assert.strictEqual(diagnostic!.category, 'indeterminate-result')
  })

  it('passing proofs produce no diagnostics', () => {
    // Arrange: create a passing proof
    const proof: ProofLike = {
      proofId: 'p1',
      clauseId: 'c1',
      outcome: 'pass',
      truth: 'determinate',
    }

    // Act
    const diagnostic = diagnosticFromProof(proof, {
      idGen: () => 'd1',
      codeForClause: () => 'IMH_RELATION_ABOVE_FAILED',
      messageForClause: () => 'Should not be called',
      fixHintsForClause: () => [],
    })

    // Assert
    assert.strictEqual(diagnostic, null)
  })

  it('proof traces map to human-readable output', () => {
    // Arrange: create diagnostic linked to a trace
    const diagnostic = makeDiagnostic(
      {
        code: 'IMH_RELATION_LEFT_OF_FAILED',
        category: 'contract-failure',
        message: 'Button is not left of field',
        traceRef: 't1',
        position: {
          start: { line: 3, column: 5, offset: 20 },
          end: { line: 3, column: 40, offset: 55 },
        },
      },
      { idGen: () => 'd1' },
    )

    const traces = [
      {
        traceEventId: 't1',
        phase: 'clause-evaluated' as const,
        at: 1000,
        refs: { clauseId: 'c1', diagnosticId: 'd1' },
        payload: { status: 'fail' },
      },
      {
        traceEventId: 't2',
        phase: 'proof-created' as const,
        at: 1001,
        refs: { clauseId: 'c1', proofId: 'p1' },
        payload: {},
      },
    ]

    // Act: render human report with traces
    const report = renderHumanReport(
      [diagnostic],
      traces,
      new Map(),
      { showTraces: true },
    )

    // Assert
    assert.ok(report.includes('Button is not left of field'))
    assert.ok(report.includes('clause-evaluated'))
    assert.ok(report.includes('IMH_RELATION_LEFT_OF_FAILED'))
    assert.ok(report.includes('line 3'))
  })

  it('trace builder emits events findable by clause id', () => {
    // Arrange: create trace builder
    const builder = createTraceBuilder({
      idGen: () => 't1',
      now: () => Date.now(),
    })

    // Act: emit events
    builder.emit({
      phase: 'clause-evaluated',
      refs: { clauseId: 'c1' },
      payload: { status: 'pass' },
    })
    builder.emit({
      phase: 'clause-evaluated',
      refs: { clauseId: 'c2' },
      payload: { status: 'fail' },
    })
    builder.emit({
      phase: 'proof-created',
      refs: { clauseId: 'c1', proofId: 'p1' },
      payload: {},
    })

    // Assert: findClauseTraces returns correct subset
    const found = findClauseTraces(builder.events(), 'c1')
    assert.strictEqual(found.length, 2)
    assert.ok(
      found.every((ev) => ev.refs.clauseId === 'c1'),
    )
  })

  it('witness shrinking works end-to-end', () => {
    // Arrange: create a witness with redundant env cases
    const witness: Witness = {
      proof: {
        proofId: 'p1',
        clauseId: 'c1',
        outcome: 'fail',
        truth: 'determinate',
      },
      envCases: ['env_1', 'env_2', 'env_3'],
      snapshots: ['default', 'hover'],
      subjects: [1, 2, 3],
      facts: [100, 101, 102],
    }

    // Act: shrink witness — only env_2 and default snapshot are needed
    const stillFails = (w: Witness) =>
      w.envCases.includes('env_2') && w.snapshots.includes('default')

    const result = shrinkWitness(witness, stillFails)

    // Assert: witness was reduced
    assert.strictEqual(result.reduced, true)
    assert.deepStrictEqual(result.witness.envCases, ['env_2'])
    assert.deepStrictEqual(result.witness.snapshots, ['default'])
    assert.ok(result.axes.includes('env-case'))
    assert.ok(result.axes.includes('snapshot'))
    assert.ok(result.steps > 0)
  })

  it('shrink results render in JSON report', () => {
    // Arrange: create a shrunk witness
    const witness: Witness = {
      proof: {
        proofId: 'p1',
        clauseId: 'c1',
        outcome: 'fail',
        truth: 'determinate',
      },
      envCases: ['env_1'],
      snapshots: ['default'],
      subjects: [1],
      facts: [100],
    }

    const shrinkResult: ShrinkResult = {
      reduced: true,
      witness,
      axes: ['env-case', 'subject'],
      steps: 3,
    }

    const shrinkMap = new Map<string, ShrinkResult>()
    shrinkMap.set('c1', shrinkResult)

    const diagnostic = makeDiagnostic(
      {
        code: 'IMH_TEST',
        category: 'contract-failure',
        message: 'Fail',
        clauseId: 'c1',
      },
      { idGen: () => 'd1' },
    )

    // Act: build JSON report with shrink
    const report = buildJsonReport(
      [diagnostic],
      [],
      shrinkMap,
      { includeShrink: true },
    )

    // Assert
    assert.strictEqual(report.summary.errorCount, 1)
    assert.ok(report.shrinkResults)
    assert.ok(report.shrinkResults!.c1)
    assert.strictEqual(report.shrinkResults!.c1.reduced, true)
    assert.ok(report.shrinkResults!.c1.axes.includes('env-case'))

    // Act: stringify
    const json = renderJsonReport(
      [diagnostic],
      [],
      shrinkMap,
      { includeShrink: true, indent: 2 },
    )
    assert.ok(json.includes('shrinkResults'))
    assert.ok(json.includes('env-case'))
  })

  it('solver diagnostics flow through to reporter formatting', () => {
    // Arrange: create solver result with diagnostics
    const solverResult = buildMockSolverResult({
      clauseResults: [
        {
          clauseId: 'c1',
          status: 'fail',
          truth: 'determinate',
          metrics: { observedGap: 4, minGap: 16 },
          witness: { subjectId: 1, referenceId: 2 },
        },
      ],
      diagnostics: [
        {
          code: 'IMH_INTERNAL_UNKNOWN_CLAUSE_KIND',
          severity: 'error',
          category: 'internal-error',
          message: 'Evaluation error',
        },
      ],
    })

    // Act: convert solver diagnostics to reporter diagnostics
    const diagnostics = solverResult.diagnostics.map((d) =>
      makeDiagnostic(
        {
          code: d.code,
          category: d.category as any,
          message: d.message,
          severity: d.severity as any,
        },
        { idGen: () => 'd1' },
      ),
    )

    // Assert
    assert.strictEqual(diagnostics.length, 1)
    assert.strictEqual(diagnostics[0].code, 'IMH_INTERNAL_UNKNOWN_CLAUSE_KIND')

    // Act: render compact
    const compact = formatDiagnosticCompact(diagnostics[0])
    assert.ok(compact.includes('IMH_INTERNAL_UNKNOWN_CLAUSE_KIND'))
  })
})