import { describe, expect, it, vi } from 'vitest'
import {
  appReturnFromPlanningReturn,
  buildExercisesListReturnContext,
  buildMediaLibraryReturnContext,
  buildNavReturnContext,
  buildPlanningHubReturnContext,
  buildTrainingRunReturnContext,
  goNavReturn,
  readNavReturnFromLocation,
  resolveNavReturnTarget,
} from './navReturnContext.js'

describe('navReturnContext', () => {
  it('buildNavReturnContext requires path and label', () => {
    expect(buildNavReturnContext({ path: '/x', label: 'Zurück' })).toEqual({
      v: 1,
      path: '/x',
      label: 'Zurück',
    })
    expect(buildNavReturnContext({ path: '', label: 'X' })).toBeNull()
  })

  it('buildExercisesListReturnContext', () => {
    const ctx = buildExercisesListReturnContext()
    expect(ctx.path).toBe('/exercises')
    expect(ctx.kind).toBe('exerciseList')
  })

  it('readNavReturnFromLocation prefers appReturn', () => {
    const ctx = buildExercisesListReturnContext()
    expect(readNavReturnFromLocation({ state: { appReturn: ctx } })).toEqual(ctx)
  })

  it('readNavReturnFromLocation bridges planningReturn', () => {
    const loc = {
      state: {
        planningReturn: {
          v: 1,
          selectedGroupId: '3',
          planView: 'list',
          calendarMonthStr: '',
          startDate: '',
          endDate: '',
          planScope: 'group',
          assignedToMeOnly: false,
        },
      },
    }
    const ctx = readNavReturnFromLocation(loc)
    expect(ctx?.kind).toBe('planningHub')
    expect(ctx?.path).toContain('/planning')
    expect(ctx?.label).toBe('Zurück zur Planung')
  })

  it('appReturnFromPlanningReturn', () => {
    const ctx = appReturnFromPlanningReturn({
      v: 1,
      selectedGroupId: '',
      planView: 'calendar',
      calendarMonthStr: '2026-05',
      startDate: '',
      endDate: '',
      planScope: 'group',
      assignedToMeOnly: false,
    })
    expect(ctx?.path).toContain('month=2026-05')
  })

  it('resolveNavReturnTarget uses fallback when no state', () => {
    const fb = { path: '/planning/training-modules', label: 'Zurück zur Modul-Bibliothek' }
    expect(resolveNavReturnTarget({ state: null }, fb)).toEqual({ ...fb, fromContext: false })
  })

  it('goNavReturn navigates to context path first', () => {
    const navigate = vi.fn()
    const ctx = buildExercisesListReturnContext()
    goNavReturn(navigate, { state: { appReturn: ctx } }, null)
    expect(navigate).toHaveBeenCalledWith('/exercises')
  })

  it('buildPlanningHubReturnContext', () => {
    const ctx = buildPlanningHubReturnContext({ selectedGroupId: '7', planView: 'list' })
    expect(ctx?.path).toContain('group=7')
    expect(ctx?.kind).toBe('planningHub')
  })

  it('buildTrainingRunReturnContext', () => {
    const ctx = buildTrainingRunReturnContext(42)
    expect(ctx?.path).toBe('/planning/run/42')
    expect(ctx?.kind).toBe('trainingRun')
    expect(buildTrainingRunReturnContext('')).toBeNull()
  })

  it('buildMediaLibraryReturnContext', () => {
    const ctx = buildMediaLibraryReturnContext()
    expect(ctx?.path).toBe('/media')
    expect(ctx?.kind).toBe('mediaLibrary')
  })
})