import { describe, it, expect } from 'vitest'
import * as fc from 'fast-check'
import {
  computeContentHash,
  buildProvisioningCode,
  parseProvisioningCode,
} from '../../app/utils/provisioning_code.js'
import { PolicyType } from '../../app/domain/configuration/configuration.js'
import type { Configuration, DesiredParameter } from '../../app/domain/configuration/configuration.js'

/**
 * **Validates: Requirements 6.2**
 *
 * Property 11: ProvisioningCode format correctness
 */

// --- Arbitraries ---

const parameterTypeArb = fc.constantFrom('string', 'int', 'unsignedInt', 'boolean', 'dateTime') as fc.Arbitrary<DesiredParameter['type']>

const desiredParameterArb: fc.Arbitrary<DesiredParameter> = fc.record({
  name: fc.stringMatching(/^[A-Za-z][A-Za-z0-9.]{1,50}$/),
  value: fc.oneof(
    fc.string({ minLength: 0, maxLength: 20 }),
    fc.integer(),
    fc.boolean()
  ),
  type: parameterTypeArb,
})

const firmwareTargetArb = fc.record({
  productClass: fc.string({ minLength: 1, maxLength: 20 }),
  targetVersion: fc.stringMatching(/^[0-9]+\.[0-9]+\.[0-9]+$/),
})

/** Generates a valid Configuration with random identifier, version, and desired state. */
function configurationArb(): fc.Arbitrary<Configuration> {
  return fc.record({
    identifier: fc.stringMatching(/^[A-Za-z0-9][A-Za-z0-9_-]{0,30}$/),
    name: fc.string({ minLength: 1, maxLength: 50 }),
    version: fc.stringMatching(/^[0-9]+\.[0-9]+\.[0-9]+$/),
    priority: fc.integer({ min: 1, max: 1000 }),
    policy: fc.constantFrom(PolicyType.ONCE, PolicyType.MAINTAIN),
    enabled: fc.boolean(),
    tags: fc.array(fc.string({ minLength: 1, maxLength: 10 }), { maxLength: 5 }),
    criteria: fc.record({
      manufacturer: fc.option(fc.string({ minLength: 1, maxLength: 20 }), { nil: undefined }),
      productClass: fc.option(fc.string({ minLength: 1, maxLength: 20 }), { nil: undefined }),
    }),
    inventory: fc.array(
      fc.record({ path: fc.stringMatching(/^[A-Za-z][A-Za-z0-9.]{1,30}\.$/) }),
      { maxLength: 5 }
    ),
    desiredParameters: fc.array(desiredParameterArb, { maxLength: 10 }),
    firmwareTarget: fc.option(firmwareTargetArb, { nil: undefined }),
    schedule: fc.constant(undefined),
    createdAt: fc.date(),
    updatedAt: fc.date(),
  }) as fc.Arbitrary<Configuration>
}

describe('Property 11: ProvisioningCode format correctness', () => {
  it('buildProvisioningCode output always matches the expected regex', () => {
    fc.assert(
      fc.property(configurationArb(), (config) => {
        const code = buildProvisioningCode(config)
        expect(code).toMatch(/^(.+)\(v(.+)\)-([a-f0-9]{12})$/)
      }),
      { numRuns: 200 }
    )
  })

  it('parseProvisioningCode(buildProvisioningCode(config)) round-trips correctly', () => {
    fc.assert(
      fc.property(configurationArb(), (config) => {
        const code = buildProvisioningCode(config)
        const parsed = parseProvisioningCode(code)

        expect(parsed).not.toBeNull()
        expect(parsed!.identifier).toBe(config.identifier)
        expect(parsed!.version).toBe(config.version)
        expect(parsed!.hash).toBe(computeContentHash(config))
      }),
      { numRuns: 200 }
    )
  })

  it('computeContentHash is deterministic (same config → same hash)', () => {
    fc.assert(
      fc.property(configurationArb(), (config) => {
        const hash1 = computeContentHash(config)
        const hash2 = computeContentHash(config)
        expect(hash1).toBe(hash2)
      }),
      { numRuns: 200 }
    )
  })

  it('computeContentHash produces exactly 12 hex characters', () => {
    fc.assert(
      fc.property(configurationArb(), (config) => {
        const hash = computeContentHash(config)
        expect(hash).toMatch(/^[a-f0-9]{12}$/)
      }),
      { numRuns: 200 }
    )
  })

  it('changing desiredParameters changes the hash', () => {
    fc.assert(
      fc.property(
        configurationArb(),
        desiredParameterArb,
        (config, extraParam) => {
          // Ensure the extra param has a different name from all existing ones
          const existingNames = new Set(config.desiredParameters.map((p) => p.name))
          if (existingNames.has(extraParam.name)) return // skip this case

          const hash1 = computeContentHash(config)
          const modified = {
            ...config,
            desiredParameters: [...config.desiredParameters, extraParam],
          }
          const hash2 = computeContentHash(modified)
          expect(hash1).not.toBe(hash2)
        }
      ),
      { numRuns: 200 }
    )
  })

  it('parseProvisioningCode returns null for invalid strings', () => {
    const invalidStringsArb = fc.oneof(
      fc.constant(''),
      fc.constant('no-parens-here'),
      fc.constant('id(v1.0)-tooshort'),
      fc.constant('id(1.0)-a1b2c3d4e5f6'), // missing 'v' prefix
      fc.constant('id(v1.0)-ZZZZZZZZZZZZ'), // uppercase not hex
      // Random strings that don't match the pattern
      fc.string({ minLength: 0, maxLength: 50 }).filter(
        (s) => !/^(.+)\(v(.+)\)-([a-f0-9]{12})$/.test(s)
      )
    )

    fc.assert(
      fc.property(invalidStringsArb, (input) => {
        expect(parseProvisioningCode(input)).toBeNull()
      }),
      { numRuns: 200 }
    )
  })
})