import { mkdtempSync, rmSync, writeFileSync } from 'node:fs'
import path from 'node:path'
import { describe, expect, it } from 'vitest'
import {
  OXLINT_SCANS,
  diagnosticTouchesAddedLines,
  isAntiSlopDirectiveUnusedWarning,
  isMovedCode,
  isRootCodeQualityPath,
  overlapsAddedLines,
  parseAddedLineRanges
} from './check-changed-code-quality.mjs'

describe('changed-code quality line matching', () => {
  it('parses added and replaced hunk ranges while ignoring deletions', () => {
    const ranges = parseAddedLineRanges(
      ['@@ -10,2 +10,3 @@', '@@ -20 +21 @@', '@@ -40,4 +42,0 @@', '@@ -50 +48,2 @@'].join('\n')
    )

    expect(ranges).toEqual([
      { start: 10, end: 12 },
      { start: 21, end: 21 },
      { start: 48, end: 49 }
    ])
  })

  it('matches diagnostics that overlap any added line', () => {
    const ranges = [
      { start: 5, end: 7 },
      { start: 12, end: 12 }
    ]

    expect(overlapsAddedLines(3, 5, ranges)).toBe(true)
    expect(overlapsAddedLines(8, 11, ranges)).toBe(false)
    expect(overlapsAddedLines(12, 14, ranges)).toBe(true)
  })

  it('normalizes absolute diagnostic paths before matching', () => {
    const root = process.cwd()
    const file = 'config/scripts/check-changed-code-quality.test.mjs'
    const diagnostic = {
      filename: `${root}/${file}`,
      labels: [{ span: { line: 24 } }]
    }

    expect(
      diagnosticTouchesAddedLines(diagnostic, new Map([[file, [{ start: 24, end: 24 }]]]), root)
    ).toBe(true)
  })

  // Why: pinning --config disables nested-config discovery, so root rules that
  // mobile/.oxlintrc.json turns off would fail the gate on mobile files.
  it('lets the untyped scan discover nested configs instead of pinning the root config', () => {
    const scan = OXLINT_SCANS.find((candidate) => candidate.label === 'code quality')

    expect(scan.args).not.toContain('--config')
    expect(scan.args).not.toContain('--disable-nested-config')
  })

  it('leaves Cloud source to the independent Cloud quality checks', () => {
    expect(isRootCodeQualityPath('cloud/apps/relay/src/index.ts')).toBe(false)
    expect(isRootCodeQualityPath('src/main/index.ts')).toBe(true)
  })
})

describe('moved-code exemption', () => {
  it('treats a verbatim contiguous block from the base as moved', () => {
    const base = [['const a = 1', 'items.map((item, index) => (', 'key={index}', '))']]
    expect(isMovedCode(['items.map((item, index) => (', 'key={index}', '))'], base)).toBe(true)
  })

  it('ignores indentation and whitespace changes from the move', () => {
    const base = [['    items.map((item, index) => (', '      key={index}']]
    expect(isMovedCode(['items.map((item, index) => (', 'key={index}'], base)).toBe(true)
  })

  it('does not exempt a genuinely new violation', () => {
    const base = [['const a = 1', 'const b = 2']]
    expect(isMovedCode(['rows.map((row, i) => <td key={i} />)'], base)).toBe(false)
  })

  it('does not exempt a block that is only partly present in the base', () => {
    const base = [['doThing()', 'unrelated()']]
    expect(isMovedCode(['doThing()', 'newlyAddedSideEffect()'], base)).toBe(false)
  })

  it('tolerates a few lines appended inside the moved block', () => {
    // A split commonly grows a hook dependency array when closure variables
    // become props; the moved body around it is still moved.
    const body = Array.from({ length: 20 }, (_, i) => `line${i}()`)
    const base = [body]
    const moved = [...body.slice(0, 19), 'newDep,', body[19]]
    expect(isMovedCode(moved, base)).toBe(true)
  })

  it('does not exempt when the anchor line is absent from the base', () => {
    const base = [['doThing()', 'filler()', 'other()']]
    expect(isMovedCode(['brandNewCall()', 'doThing()', 'other()'], base)).toBe(false)
  })

  it('does not exempt when most of the block is absent from the base', () => {
    const base = [['keep0()', 'keep1()', 'unrelated()']]
    const mostlyNew = ['keep0()', ...Array.from({ length: 18 }, (_, i) => `fresh${i}()`)]
    expect(isMovedCode(mostlyNew, base)).toBe(false)
  })

  it('ignores blank lines when matching', () => {
    const base = [['a()', 'b()']]
    expect(isMovedCode(['a()', '', 'b()'], base)).toBe(true)
  })

  it('never exempts an empty highlight', () => {
    expect(isMovedCode(['', '   '], [['a()']])).toBe(false)
  })
})

describe('anti-slop directive unused warning', () => {
  const root = path.resolve(import.meta.dirname, '..', '..')
  // Assembled so no line here is itself a directive the gate would scan.
  const directive = (rule) => `/* oxlint-disable ${rule} -- reason */`

  const withFixture = (firstLine, assert) => {
    const directory = mkdtempSync(path.join(root, 'config', 'anti-slop-directive-test-'))
    try {
      const file = path.join(directory, 'fixture.ts')
      writeFileSync(file, [firstLine, 'export const value = 1', ''].join('\n'))
      assert({
        message: 'Unused oxlint-disable directive (no problems were reported).',
        filename: file,
        labels: [{ span: { line: 1 } }]
      })
    } finally {
      rmSync(directory, { recursive: true, force: true })
    }
  }

  it('exempts a suppression the root scan cannot resolve', () => {
    withFixture(directive('anti-slop/no-module-mocking'), (diagnostic) => {
      expect(isAntiSlopDirectiveUnusedWarning(diagnostic, root)).toBe(true)
    })
  })

  it('still reports an unused directive for a rule the root scan does load', () => {
    withFixture(directive('unicorn/no-array-reduce'), (diagnostic) => {
      expect(isAntiSlopDirectiveUnusedWarning(diagnostic, root)).toBe(false)
    })
  })

  it('ignores diagnostics that are not unused-directive warnings', () => {
    withFixture(directive('anti-slop/no-module-mocking'), (diagnostic) => {
      expect(
        isAntiSlopDirectiveUnusedWarning({ ...diagnostic, message: 'Unexpected any.' }, root)
      ).toBe(false)
    })
  })
})