import { createHash } from 'node:crypto'

import { DomainError } from '@devrunbook/domain'

import {
  authorizeWorkspaceAction,
  type AuthenticatedActor,
  type WorkspaceAuthorizationLookup,
} from '../auth/workspace-authorization'
import { lintPlaybookPackage } from '../quality/playbook-package-linter'
import {
  evaluateStaticCase,
  type QualityMatrix,
  type StaticEvaluationCase,
  type StaticEvaluationObservation,
  type StaticEvaluationResult,
} from '../quality/static-quality-evaluation'
import {
  parsePrivatePlaybookDraftEtag,
  type PrivatePlaybookDraftStore,
} from './private-playbook-drafts'

export interface PrivatePlaybookQualityStore {
  attestReview(attestation: {
    readonly workspaceId: string
    readonly versionId: string
    readonly reviewedBy: string
    readonly attestedDigest: string
    readonly schemaAndSemanticValidationPassed: boolean
    readonly blockingLintFindingCount: number
    readonly limitationsDocumented: boolean
    readonly unresolvedSafetyRegression: boolean
    readonly review: Readonly<Record<string, unknown>>
    readonly reviewedAt: Date
  }): Promise<boolean>
  upsertStaticCase(request: {
    readonly workspaceId: string
    readonly versionId: string
    readonly evaluationCase: StaticEvaluationCase
    readonly caseDigest: string
    readonly now: Date
  }): Promise<string | null>
  appendStaticResult(request: {
    readonly workspaceId: string
    readonly versionId: string
    readonly logicalCaseId: string
    readonly fixtureVersion: string
    readonly result: StaticEvaluationResult
    readonly environment: Readonly<Record<string, unknown>>
    readonly executedBy: string
    readonly now: Date
  }): Promise<string | null>
}

export interface PrivatePlaybookQualityDependencies {
  readonly authorization: WorkspaceAuthorizationLookup
  readonly drafts: PrivatePlaybookDraftStore
  readonly quality: PrivatePlaybookQualityStore
  readonly now: () => Date
}

interface QualityActorRequest {
  readonly actor: AuthenticatedActor | null
  readonly workspaceId: string
  readonly versionId: string
  readonly expectedEtag: string
}

async function authorizeEditor(
  dependencies: PrivatePlaybookQualityDependencies,
  request: QualityActorRequest,
): Promise<string> {
  const context = await authorizeWorkspaceAction(dependencies.authorization, {
    actor: request.actor,
    workspaceId: request.workspaceId,
    action: 'write',
  })
  return context.userId
}

async function currentDraft(
  dependencies: PrivatePlaybookQualityDependencies,
  request: QualityActorRequest,
) {
  const draft = await dependencies.drafts.findVersionForWorkspace(
    request.workspaceId,
    request.versionId,
  )
  if (!draft)
    throw new DomainError(
      'private_playbook_not_found',
      'Private playbook not found',
    )
  const expected = parsePrivatePlaybookDraftEtag(request.expectedEtag)
  if (
    expected.revision !== draft.draftRevision ||
    expected.digest !== draft.draftDigest
  ) {
    throw new DomainError(
      'private_playbook_quality_conflict',
      'The private playbook changed before evidence was recorded',
    )
  }
  if (draft.publishedAt !== null) {
    throw new DomainError(
      'private_playbook_published_immutable',
      'Published playbook versions cannot receive mutable draft evidence',
    )
  }
  return draft
}

function canonical(value: unknown): unknown {
  if (Array.isArray(value)) return value.map(canonical)
  if (value !== null && typeof value === 'object') {
    return Object.fromEntries(
      Object.entries(value as Record<string, unknown>)
        .sort(([left], [right]) => left.localeCompare(right, 'en'))
        .map(([key, child]) => [key, canonical(child)]),
    )
  }
  return value
}

function digest(value: unknown): string {
  return createHash('sha256')
    .update(JSON.stringify(canonical(value)), 'utf8')
    .digest('hex')
}

function reviewNote(value: string): string {
  const note = value.trim()
  if (note.length < 1 || note.length > 4000) {
    throw new DomainError(
      'private_playbook_review_invalid',
      'Review note must contain between 1 and 4000 characters',
    )
  }
  return note
}

export async function reviewPrivatePlaybookDraft(
  dependencies: PrivatePlaybookQualityDependencies,
  request: QualityActorRequest & {
    readonly limitationsDocumented: boolean
    readonly unresolvedSafetyRegression: boolean
    readonly note: string
  },
) {
  const reviewedBy = await authorizeEditor(dependencies, request)
  const draft = await currentDraft(dependencies, request)
  const lint = lintPlaybookPackage({
    packageJson: draft.packageJson,
    packageDigest: draft.draftDigest,
    template: { path: 'template', content: draft.templateText },
    published: false,
  })
  const blockingLintFindingCount = lint.findings.filter(
    (finding) => finding.severity === 'error',
  ).length
  const recorded = await dependencies.quality.attestReview({
    workspaceId: request.workspaceId,
    versionId: request.versionId,
    reviewedBy,
    attestedDigest: draft.draftDigest,
    schemaAndSemanticValidationPassed: true,
    blockingLintFindingCount,
    limitationsDocumented: request.limitationsDocumented,
    unresolvedSafetyRegression: request.unresolvedSafetyRegression,
    review: { note: reviewNote(request.note), lint },
    reviewedAt: dependencies.now(),
  })
  if (!recorded)
    throw new DomainError(
      'private_playbook_quality_conflict',
      'The private playbook changed before review evidence was recorded',
    )
  return { digest: draft.draftDigest, lint, recorded: true as const }
}

export async function evaluatePrivatePlaybookStaticCase(
  dependencies: PrivatePlaybookQualityDependencies,
  request: QualityActorRequest & {
    readonly evaluationCase: StaticEvaluationCase
    readonly observation: StaticEvaluationObservation
    readonly dimensions: QualityMatrix
    readonly environment: Readonly<Record<string, unknown>>
  },
) {
  const executedBy = await authorizeEditor(dependencies, request)
  const draft = await currentDraft(dependencies, request)
  const target = request.evaluationCase.target
  if (
    target.id !== draft.logicalId ||
    target.version !== draft.semanticVersion ||
    target.digest !== draft.draftDigest
  ) {
    throw new DomainError(
      'private_playbook_evaluation_stale',
      'Evaluation case target does not match the current draft',
    )
  }
  const caseId = await dependencies.quality.upsertStaticCase({
    workspaceId: request.workspaceId,
    versionId: request.versionId,
    evaluationCase: request.evaluationCase,
    caseDigest: digest(request.evaluationCase),
    now: dependencies.now(),
  })
  if (!caseId)
    throw new DomainError(
      'private_playbook_evaluation_conflict',
      'The private playbook changed before the evaluation case was stored',
    )
  const result = evaluateStaticCase(
    request.evaluationCase,
    request.observation,
    request.dimensions,
  )
  const resultId = await dependencies.quality.appendStaticResult({
    workspaceId: request.workspaceId,
    versionId: request.versionId,
    logicalCaseId: request.evaluationCase.id,
    fixtureVersion: request.evaluationCase.fixture.version,
    result,
    environment: request.environment,
    executedBy,
    now: dependencies.now(),
  })
  if (!resultId)
    throw new DomainError(
      'private_playbook_evaluation_conflict',
      'The private playbook changed before the result was stored',
    )
  return { caseId, resultId, result }
}