/**
 * Phase 1 tab-registration spec: mounts the CLIENT half against a mock
 * better-sidebar registry and verifies the five `apes:*` tabs register with
 * the right descriptors, the disposer tears them down (HMR-safe), and a
 * missing `betterSidebar` peer degrades without throwing.
 *
 * The React components are NOT rendered here (Phase 0 testing convention:
 * node vitest environment, no DOM). The descriptors' `component` field is
 * asserted to be a function; the JSX it returns is only evaluated when the
 * host actually mounts the tab, which a live DSH shell does (Phase 1+ mount
 * smoke). What this spec pins is the REGISTRATION CONTRACT: the ids, the
 * title/order/single shape, and the disposer lifecycle.
 *
 * The mock registry records every registered descriptor and returns a
 * disposer that removes it — mirroring the real better-sidebar
 * `registerTab` (returns `() => void`, invoked by cordis on fiber teardown).
 */
import { describe, expect, it } from 'vitest'
import { apply, filterTasksRows } from '../src/client/index.tsx'

/** The five tab ids this plugin owns (the + menu contract). */
const EXPECTED_IDS = ['apes:tasks', 'apes:agents', 'apes:apps', 'apes:messages', 'apes:profile']

/** One registered descriptor shape the mock records (the fields we assert). */
interface Registered {
  id: string
  title: string | (() => string)
  order?: number
  single?: boolean
  component: unknown
  badge?: (ctx: unknown, scope: unknown, state: unknown) => string | number | null | undefined
}

/**
 * A mock better-sidebar registry: `registerTab` records the descriptor and
 * returns a disposer that removes it (the real service's contract).
 */
function makeMockRegistry() {
  const registered: Registered[] = []
  return {
    registry: {
      registerTab: (descriptor: Registered) => {
        registered.push(descriptor)
        return () => {
          const i = registered.findIndex((r) => r.id === descriptor.id)
          if (i !== -1) registered.splice(i, 1)
        }
      },
      getTabs: () => registered,
      subscribe: () => () => undefined,
    },
    registered,
  }
}

/** A no-op locale service (registerLocales only needs register/getSnapshot/subscribe). */
function makeMockLocale() {
  return {
    getSnapshot: () => ({ active: 'zh' }),
    subscribe: () => () => undefined,
    register: () => () => undefined,
  }
}

/**
 * Drive a cordis effect: invoke the effect body, capture its returned
 * disposer, and expose `teardown()` so a test can simulate fiber unmount.
 */
function makeEffectHarness() {
  let disposer: (() => void) | undefined
  return {
    effect: (fn: () => void | (() => void)) => {
      const result = fn()
      if (typeof result === 'function') disposer = result
      return () => disposer?.()
    },
    teardown: () => disposer?.(),
  }
}

describe('apes-sidebar client tab registration (Phase 1)', () => {
  it('registers all five apes:* tabs into the better-sidebar registry', () => {
    const { registry, registered } = makeMockRegistry()
    const eff = makeEffectHarness()
    apply({ betterSidebar: registry, locale: makeMockLocale(), ...eff } as never)

    expect(registered.map((r) => r.id).sort()).toEqual([...EXPECTED_IDS].sort())
    expect(registry.getTabs()).toHaveLength(5)
  })

  it('gives every tab a title function, an ascending order, single-instance, and a component fn', () => {
    const { registered } = makeMockRegistry()
    const eff = makeEffectHarness()
    apply({ betterSidebar: makeMockRegistry().registry, locale: makeMockLocale(), ...eff } as never)
    // Re-run on the registry whose descriptors we captured.
    const { registry, registered: reg2 } = makeMockRegistry()
    const eff2 = makeEffectHarness()
    apply({ betterSidebar: registry, locale: makeMockLocale(), ...eff2 } as never)

    for (const d of reg2) {
      expect(EXPECTED_IDS).toContain(d.id)
      // title is a function (i18n-friendly) and resolves to a non-empty string.
      expect(typeof d.title === 'function' ? typeof d.title() : typeof d.title).toBe('string')
      if (typeof d.title === 'function') expect(d.title().length).toBeGreaterThan(0)
      // order is present and numeric.
      expect(typeof d.order).toBe('number')
      // single-instance sugar (each apes:* tab is a singleton panel).
      expect(d.single).toBe(true)
      // component is a render function.
      expect(typeof d.component).toBe('function')
    }
    // orders are strictly ascending in registration order.
    const orders = reg2.map((d) => d.order as number)
    for (let i = 1; i < orders.length; i++) {
      expect(orders[i]!).toBeGreaterThan(orders[i - 1]!)
    }
  })

  it('the combined disposer removes all five tabs (HMR-safe teardown)', () => {
    const { registry } = makeMockRegistry()
    const eff = makeEffectHarness()
    apply({ betterSidebar: registry, locale: makeMockLocale(), ...eff } as never)
    expect(registry.getTabs()).toHaveLength(5)

    // Simulate fiber unmount: cordis invokes the effect's returned disposer.
    eff.teardown()
    expect(registry.getTabs()).toHaveLength(0)

    // A second teardown is a safe no-op (double-dispose is swallowed).
    expect(() => eff.teardown()).not.toThrow()
  })

  it('does not register when betterSidebar is absent (bare DSH degrades)', () => {
    const eff = makeEffectHarness()
    expect(() => apply({ locale: makeMockLocale(), ...eff } as never)).not.toThrow()
    // No effect was run (the guard returns before ctx.effect).
    // The effect harness captured nothing.
    expect(eff.effect).toBeTypeOf('function')
  })

  it('registers synchronously when no effect API is present (non-cordis harness)', () => {
    const { registry } = makeMockRegistry()
    // No `effect` on the context → apply registers synchronously.
    apply({ betterSidebar: registry, locale: makeMockLocale() } as never)
    expect(registry.getTabs()).toHaveLength(5)
  })

  it('tab ids follow the apes:* namespace (never wb:* or builtin ids)', () => {
    const { registered } = makeMockRegistry()
    const eff = makeEffectHarness()
    apply({ betterSidebar: makeMockRegistry().registry, locale: makeMockLocale(), ...eff } as never)
    for (const d of registered) {
      expect(d.id.startsWith('apes:')).toBe(true)
      expect(d.id).not.toMatch(/^wb:/)
    }
  })
})

/**
 * Build a mock `ctx.sessions.list.getSnapshot()` feed for badge assertions.
 * `byId` maps session id → a summary with optional `running` / `origin`.
 */
function makeMockSessionsCtx(byId: Record<string, { running?: boolean; origin?: string }>) {
  const snapshot = { current: undefined as string | undefined, byId }
  return {
    sessions: {
      list: {
        getSnapshot: () => snapshot,
        subscribe: () => () => undefined,
      },
    },
  }
}

/**
 * Phase 2 badge contract: `apes:tasks` shows the running-session count,
 * `apes:agents` shows the subagent count, and BOTH hide (return null) when
 * their count is 0. The badge is a pure `(ctx) => …` function, so it is
 * exercised directly against a mock sessions feed — no DOM, no rendering.
 */
describe('apes-sidebar tab badges (Phase 2)', () => {
  /** Register into a fresh mock registry and return the captured descriptors. */
  function registeredDescriptors() {
    const { registry, registered } = makeMockRegistry()
    const eff = makeEffectHarness()
    apply({ betterSidebar: registry, locale: makeMockLocale(), ...eff } as never)
    return registered
  }

  function badgeOf(registered: Registered[], id: string) {
    return registered.find((d) => d.id === id)?.badge
  }

  it('apes:tasks badge is the running-session count (2 running → 2)', () => {
    const badge = badgeOf(registeredDescriptors(), 'apes:tasks')
    expect(badge).toBeTypeOf('function')
    const ctx = makeMockSessionsCtx({
      a: { running: true },
      b: { running: true },
      c: { running: false },
    })
    expect(badge!(ctx as never, {} as never, {} as never)).toBe(2)
  })

  it('apes:tasks badge is null when nothing is running (hidden pill)', () => {
    const badge = badgeOf(registeredDescriptors(), 'apes:tasks')
    const ctx = makeMockSessionsCtx({ a: { running: false }, b: {} })
    expect(badge!(ctx as never, {} as never, {} as never)).toBeNull()
  })

  it('apes:agents badge is the subagent count (1 subagent → 1)', () => {
    const badge = badgeOf(registeredDescriptors(), 'apes:agents')
    expect(badge).toBeTypeOf('function')
    const ctx = makeMockSessionsCtx({
      parent: {},
      child: { origin: 'subagent' },
      other: { running: true }, // running but NOT a subagent → not counted
    })
    expect(badge!(ctx as never, {} as never, {} as never)).toBe(1)
  })

  it('apes:agents badge is null when there are no subagents (hidden pill)', () => {
    const badge = badgeOf(registeredDescriptors(), 'apes:agents')
    const ctx = makeMockSessionsCtx({ a: {}, b: { running: true } })
    expect(badge!(ctx as never, {} as never, {} as never)).toBeNull()
  })

  it('apps/messages/profile have NO badge (information placeholders, no count)', () => {
    const registered = registeredDescriptors()
    for (const id of ['apes:apps', 'apes:messages', 'apes:profile']) {
      expect(badgeOf(registered, id)).toBeUndefined()
    }
  })
})

/**
 * Phase 2 per-tab state: the apes:tasks `showInactive` filter. When the user
 * toggles the preference off, only running sessions render. This is a pure
 * decision function (the hook's uSES↔settings wiring needs a render, but the
 * filter itself is plain and unit-testable).
 */
describe('apes:tasks showInactive per-tab state filter (Phase 2)', () => {
  const sessions = [
    { id: 'a', running: true },
    { id: 'b', running: false },
    { id: 'c', running: true },
    { id: 'd' }, // running undefined → treated as not running
  ]

  it('showInactive=true renders every session', () => {
    expect(filterTasksRows(sessions, true)).toHaveLength(4)
  })

  it('showInactive=false renders only running sessions (2 of 4)', () => {
    const rows = filterTasksRows(sessions, false)
    expect(rows).toHaveLength(2)
    expect(rows.map((s) => s.id)).toEqual(['a', 'c'])
  })

  it('showInactive=false on an all-running list keeps everything', () => {
    expect(filterTasksRows([{ running: true }, { running: true }], false)).toHaveLength(2)
  })

  it('showInactive=false on an all-inactive list yields empty', () => {
    expect(filterTasksRows([{ running: false }, {}], false)).toHaveLength(0)
  })
})