import { Page } from '@playwright/test'

/**
 * Shared mock helper for the /stundenplan suite. Intercepts every endpoint
 * the school-service proxy serves so tests stay hermetic.
 */

export const MOCK_TEACHER_ID = '11111111-1111-1111-1111-111111111111'
export const MOCK_SUBJECT_ID = '22222222-2222-2222-2222-222222222222'
export const MOCK_CLASS_ID = '33333333-3333-3333-3333-333333333333'

export interface MockClass {
  id: string
  name: string
  grade_level: number
  student_count: number
  notes?: string
  created_by_user_id: string
  created_at: string
}

export interface MockOpts {
  classes?: MockClass[]
  teachers?: unknown[]
  subjects?: unknown[]
  rooms?: unknown[]
  periods?: unknown[]
  curriculum?: unknown[]
  assignments?: unknown[]
  solutions?: unknown[]
  lessons?: unknown[]
}

export async function mockSchoolApi(page: Page, opts: MockOpts = {}) {
  const classes = opts.classes ?? []
  const teachers = opts.teachers ?? []
  const subjects = opts.subjects ?? []
  const rooms = opts.rooms ?? []
  const periods = opts.periods ?? []
  const curriculum = opts.curriculum ?? []
  const assignments = opts.assignments ?? []
  const solutions = opts.solutions ?? []
  const lessons = opts.lessons ?? []

  await page.route('**/api/school/timetable/classes', async (route) => {
    if (route.request().method() === 'GET') {
      return route.fulfill({ status: 200, contentType: 'application/json', body: JSON.stringify(classes) })
    }
    if (route.request().method() === 'POST') {
      const body = JSON.parse(route.request().postData() || '{}')
      const created: MockClass = {
        id: 'new-class-id',
        name: body.name,
        grade_level: body.grade_level,
        student_count: body.student_count ?? 0,
        notes: body.notes,
        created_by_user_id: 'test-user',
        created_at: new Date().toISOString(),
      }
      classes.push(created)
      return route.fulfill({ status: 201, contentType: 'application/json', body: JSON.stringify(created) })
    }
    return route.fulfill({ status: 405 })
  })

  const staticList = (path: string, data: unknown) =>
    page.route(`**/api/school/timetable/${path}`, async (route) =>
      route.fulfill({ status: 200, contentType: 'application/json', body: JSON.stringify(data) }))

  await staticList('teachers', teachers)
  await staticList('subjects', subjects)
  await staticList('rooms', rooms)
  await staticList('periods', periods)
  await staticList('curriculum', curriculum)
  await staticList('assignments', assignments)

  for (const path of [
    'constraints/teacher/unavailable-day',
    'constraints/teacher/unavailable-window',
    'constraints/teacher/max-hours-day',
    'constraints/teacher/max-hours-week',
    'constraints/teacher/excluded-subject',
    'constraints/teacher/excluded-room',
    'constraints/subject/max-consecutive',
    'constraints/subject/preferred-period',
    'constraints/subject/min-day-gap',
    'constraints/subject/contiguous-when-repeated',
    'constraints/subject/double-lesson',
    'constraints/class/max-hours-day',
    'constraints/class/no-gaps',
    'constraints/room/requires-type',
    'constraints/room/unavailable',
  ]) {
    await staticList(path, [])
  }

  await page.route('**/api/school/timetable/solutions', async (route) => {
    if (route.request().method() === 'GET') {
      return route.fulfill({ status: 200, contentType: 'application/json', body: JSON.stringify(solutions) })
    }
    if (route.request().method() === 'POST') {
      const body = JSON.parse(route.request().postData() || '{}')
      const created = {
        id: 'new-solution-id',
        created_by_user_id: 'test-user',
        name: body.name || 'Plan',
        status: 'pending',
        hard_score: null,
        soft_score: null,
        created_at: new Date().toISOString(),
      }
      ;(solutions as unknown[]).push(created)
      return route.fulfill({ status: 201, contentType: 'application/json', body: JSON.stringify(created) })
    }
    return route.fulfill({ status: 405 })
  })

  await page.route(/\/api\/school\/timetable\/solutions\/[^/]+\/lessons$/, async (route) => {
    return route.fulfill({ status: 200, contentType: 'application/json', body: JSON.stringify(lessons) })
  })
  await page.route(/\/api\/school\/timetable\/solutions\/[^/]+$/, async (route) => {
    if (route.request().method() === 'DELETE') {
      return route.fulfill({ status: 200, contentType: 'application/json', body: '{"message":"deleted"}' })
    }
    const url = route.request().url()
    const id = url.split('/').pop() ?? ''
    const sol = (solutions as Array<{ id: string }>).find(s => s.id === id)
    if (!sol) return route.fulfill({ status: 404 })
    return route.fulfill({ status: 200, contentType: 'application/json', body: JSON.stringify(sol) })
  })
}