/**
 * mizan-fastapi e2e — Real Chromium → React with generated hooks → real FastAPI server.
 *
 * Mirrors examples/django-react-site/mizan.spec.ts minus channel/form tests
 * (those features are Django-only — FastAPI projects use native equivalents
 * or skip them entirely).
 */

import { test, expect } from '@playwright/test'

const BASE = process.env.HARNESS_URL || 'http://localhost:5175'

async function fixture(page: any, name: string) {
    await page.goto(`${BASE}#${name}`)
    await page.waitForSelector('[data-testid="result"], [data-testid="error-type"]', { timeout: 10000 })
}

async function getResult(page: any): Promise<any> {
    const el = page.locator('[data-testid="result"]')
    if (await el.count() > 0) return JSON.parse(await el.textContent())
    return null
}

async function getError(page: any) {
    const typeEl = page.locator('[data-testid="error-type"]')
    if (await typeEl.count() === 0) return null
    return {
        type: await typeEl.textContent(),
        code: await page.locator('[data-testid="error-code"]').textContent(),
        message: await page.locator('[data-testid="error-message"]').textContent(),
    }
}

// ─── Function hooks ─────────────────────────────────────────────────────────

test.describe('generated function hooks', () => {
    test('useEcho returns echoed text', async ({ page }) => {
        await fixture(page, 'echo')
        const result = await getResult(page)
        expect(result.message).toBe('e2e-test')
    })

    test('useAdd returns correct sum', async ({ page }) => {
        await fixture(page, 'add')
        const result = await getResult(page)
        expect(result.result).toBe(42)
    })

    test('useMultiply returns product', async ({ page }) => {
        await fixture(page, 'multiply')
        const result = await getResult(page)
        expect(result.product).toBe(42)
    })

    test('usePermissionCheckFn succeeds with correct secret', async ({ page }) => {
        await fixture(page, 'permission-success')
        const result = await getResult(page)
        expect(result.message).toBe('access granted')
    })
})

// ─── Error codes ────────────────────────────────────────────────────────────

test.describe('error codes from generated hooks', () => {
    test('non-existent function → MizanError NOT_FOUND', async ({ page }) => {
        await fixture(page, 'not-found')
        const error = await getError(page)
        expect(error!.type).toBe('MizanError')
        expect(error!.code).toBe('NOT_FOUND')
    })

    test('wrong input types → MizanError VALIDATION_ERROR', async ({ page }) => {
        await fixture(page, 'validation-error')
        const error = await getError(page)
        expect(error!.type).toBe('MizanError')
        expect(error!.code).toBe('VALIDATION_ERROR')
    })

    test('useWhoami anonymous → auth error', async ({ page }) => {
        await fixture(page, 'auth-required')
        const error = await getError(page)
        expect(error!.type).toBe('MizanError')
        expect(['UNAUTHORIZED', 'FORBIDDEN']).toContain(error!.code)
    })

    test('useStaffOnly anonymous → UNAUTHORIZED', async ({ page }) => {
        await fixture(page, 'staff-only')
        const error = await getError(page)
        expect(error!.type).toBe('MizanError')
        expect(['UNAUTHORIZED', 'FORBIDDEN']).toContain(error!.code)
    })

    test('useSuperuserOnly anonymous → UNAUTHORIZED', async ({ page }) => {
        await fixture(page, 'superuser-only')
        const error = await getError(page)
        expect(error!.type).toBe('MizanError')
        expect(['UNAUTHORIZED', 'FORBIDDEN']).toContain(error!.code)
    })

    test('useVerifiedOnly anonymous → FORBIDDEN', async ({ page }) => {
        await fixture(page, 'verified-only')
        const error = await getError(page)
        expect(error!.type).toBe('MizanError')
        expect(['UNAUTHORIZED', 'FORBIDDEN']).toContain(error!.code)
    })

    test('useNotImplementedFn → NOT_IMPLEMENTED', async ({ page }) => {
        await fixture(page, 'not-implemented')
        const error = await getError(page)
        expect(error!.type).toBe('MizanError')
        expect(error!.code).toBe('NOT_IMPLEMENTED')
    })

    test('useBuggyFn → INTERNAL_ERROR', async ({ page }) => {
        await fixture(page, 'internal-error')
        const error = await getError(page)
        expect(error!.type).toBe('MizanError')
        expect(error!.code).toBe('INTERNAL_ERROR')
    })

    test('usePermissionCheckFn wrong secret → FORBIDDEN', async ({ page }) => {
        await fixture(page, 'permission-error')
        const error = await getError(page)
        expect(error!.type).toBe('MizanError')
        expect(error!.code).toBe('FORBIDDEN')
    })
})

// ─── Context hooks ──────────────────────────────────────────────────────────

test.describe('generated context hooks', () => {
    test('useCurrentUser returns anonymous data', async ({ page }) => {
        await page.goto(`${BASE}#context-current-user`)
        await page.waitForSelector('[data-testid="result"]', { timeout: 10000 })
        const result = await getResult(page)
        expect(result.authenticated).toBe(false)
        expect(result.email).toBe('')
    })
})

// ─── Session gate ───────────────────────────────────────────────────────────

test.describe('session gate', () => {
    test('no /session/ requests fire when configured with session={false}', async ({ page }) => {
        const sessionCalls: string[] = []
        page.on('request', (req) => {
            const url = req.url()
            if (url.includes('/session/')) sessionCalls.push(url)
        })
        await fixture(page, 'echo')
        await getResult(page)
        expect(sessionCalls).toEqual([])
    })
})

// ─── Merge protocol ─────────────────────────────────────────────────────────

test.describe('merge protocol', () => {
    test('@client(merge=...) routes to the correct slot, leaves siblings untouched, no refetch', async ({ page }) => {
        // The morphs context bundles two list slots:
        //   morph_groups: list[MorphGroupMeta]  — {id, label, count}
        //   morph_layers: list[MorphLayer]      — {id, group_id, label, value}
        // set_morph_value returns MorphLayer. Server-side slot resolution
        // (via mizan_core.type_utils.types_match_for_merge) must route to
        // morph_layers and leave morph_groups intact. A kernel-side heuristic
        // would have to guess between the two id-bearing list slots.
        const morphsFetches: string[] = []
        page.on('request', (req) => {
            const url = req.url()
            if (url.includes('/api/mizan/ctx/morphs/')) morphsFetches.push(url)
        })

        await page.goto(`${BASE}#merge-morph`)
        await page.waitForFunction(() => {
            const el = document.querySelector('[data-testid="result"]')
            if (!el) return false
            try {
                const data = JSON.parse(el.textContent!)
                return data.layers?.some((l: any) => l.id === 1 && l.value === 0.75)
            } catch { return false }
        }, { timeout: 5000 })

        const result = await getResult(page)
        const layer = result.layers.find((l: any) => l.id === 1)
        expect(layer.value).toBe(0.75)
        expect(layer.label).toBe('brow')
        // Sibling slot is unchanged — the server didn't route MorphLayer into morph_groups.
        expect(result.groups).toEqual([{ id: 1, label: 'face', count: 2 }])
        // Initial mount fetches once; merge path must not trigger a refetch.
        expect(morphsFetches.length).toBe(1)
    })
})