/**
 * Upload tests — multipart File-part binding + constraint enforcement.
 *
 * Mirrors mizan-fastapi/tests/test_upload.py: a multipart call binds file parts
 * into the function's Upload-typed inputs, and `File(...)` constraints
 * (max-size, content-type) reject at dispatch with a 400.
 */

import { describe, test, expect, beforeEach } from 'bun:test'
import {
    client,
    clearRegistry,
    handleMultipartCall,
    parseSize,
    validateUpload,
    UploadedFile,
    type StructField,
} from '../src'

const uploadField = (name: string, opts: { maxSize?: number; contentTypes?: string[]; optional?: boolean; list?: boolean } = {}): StructField => {
    let shape: any = { kind: 'upload', maxSize: opts.maxSize, contentTypes: opts.contentTypes }
    if (opts.list) shape = { kind: 'list', inner: shape }
    if (opts.optional) shape = { kind: 'optional', inner: shape }
    return { name, required: !opts.optional, shape }
}
const intField = (name: string): StructField => ({ name, required: true, shape: { kind: 'primitive', primitive: 'integer' } })

function multipart(fn: string, args: Record<string, any>, files: Record<string, Blob | Blob[]>): FormData {
    const form = new FormData()
    form.set('fn', fn)
    form.set('args', JSON.stringify(args))
    for (const [key, val] of Object.entries(files)) {
        for (const f of Array.isArray(val) ? val : [val]) form.append(key, f)
    }
    return form
}

describe('parseSize', () => {
    test('parses human sizes', () => {
        expect(parseSize('5MB')).toBe(5 * 1024 * 1024)
        expect(parseSize('1KB')).toBe(1024)
        expect(parseSize('2GB')).toBe(2 * 1024 ** 3)
        expect(parseSize(123)).toBe(123)
        expect(parseSize('500')).toBe(500)
    })
})

describe('validateUpload', () => {
    test('max-size rejection', () => {
        const f = new UploadedFile('a.bin', 'application/octet-stream', new Uint8Array(100))
        expect(validateUpload(f, { maxSize: 50 })).toContain('exceeds max size')
        expect(validateUpload(f, { maxSize: 200 })).toBeNull()
    })

    test('content-type allowlist + wildcard', () => {
        const png = new UploadedFile('a.png', 'image/png', new Uint8Array(1))
        expect(validateUpload(png, { contentTypes: ['image/png'] })).toBeNull()
        expect(validateUpload(png, { contentTypes: ['image/*'] })).toBeNull()
        expect(validateUpload(png, { contentTypes: ['application/pdf'] })).toContain('not allowed')
    })
})

describe('multipart dispatch', () => {
    beforeEach(() => clearRegistry())

    test('binds a file part into the Upload input', async () => {
        let received: UploadedFile | null = null
        client(
            {
                affects: 'avatars',
                ir: { input: [intField('user_id'), uploadField('avatar', { contentTypes: ['image/png'] })] },
            },
            async function set_avatar(user_id: number, avatar: UploadedFile) {
                received = avatar
                return { ok: true, name: avatar.filename, bytes: avatar.size }
            },
        )

        const form = multipart('set_avatar', { user_id: 5 }, {
            avatar: new File([new Uint8Array([1, 2, 3, 4])], 'face.png', { type: 'image/png' }),
        })
        const r = await handleMultipartCall(form)
        expect(r.status).toBe(200)
        expect(r.body.result).toEqual({ ok: true, name: 'face.png', bytes: 4 })
        expect(received).not.toBeNull()
        expect(received!.read()).toEqual(new Uint8Array([1, 2, 3, 4]))
    })

    test('max-size violation rejects with 400', async () => {
        client(
            { affects: 'avatars', ir: { input: [uploadField('avatar', { maxSize: 3 })] } },
            async function set_avatar(_avatar: UploadedFile) {
                return { ok: true }
            },
        )
        const form = multipart('set_avatar', {}, {
            avatar: new File([new Uint8Array([1, 2, 3, 4, 5])], 'big.bin', { type: 'application/octet-stream' }),
        })
        const r = await handleMultipartCall(form)
        expect(r.status).toBe(400)
        expect(r.body.message).toContain('avatar:')
        expect(r.body.message).toContain('exceeds max size')
    })

    test('content-type violation rejects with 400', async () => {
        client(
            { affects: 'avatars', ir: { input: [uploadField('avatar', { contentTypes: ['image/png'] })] } },
            async function set_avatar(_avatar: UploadedFile) {
                return { ok: true }
            },
        )
        const form = multipart('set_avatar', {}, {
            avatar: new File([new Uint8Array([1])], 'doc.pdf', { type: 'application/pdf' }),
        })
        const r = await handleMultipartCall(form)
        expect(r.status).toBe(400)
        expect(r.body.message).toContain('not allowed')
    })

    test('list upload binds multiple parts', async () => {
        let count = 0
        client(
            { affects: 'gallery', ir: { input: [uploadField('photos', { list: true })] } },
            async function add_photos(photos: UploadedFile[]) {
                count = photos.length
                return { ok: true, count: photos.length }
            },
        )
        const form = multipart('add_photos', {}, {
            photos: [
                new File([new Uint8Array([1])], 'a.png', { type: 'image/png' }),
                new File([new Uint8Array([2])], 'b.png', { type: 'image/png' }),
            ],
        })
        const r = await handleMultipartCall(form)
        expect(r.status).toBe(200)
        expect(r.body.result.count).toBe(2)
        expect(count).toBe(2)
    })

    test('missing fn → 400', async () => {
        const form = new FormData()
        form.set('args', '{}')
        const r = await handleMultipartCall(form)
        expect(r.status).toBe(400)
        expect(r.body.message).toContain("'fn'")
    })

    test('invalidation still emitted on multipart mutation', async () => {
        client(
            { affects: 'avatars', ir: { input: [intField('user_id'), uploadField('avatar')] } },
            async function set_avatar(_user_id: number, _avatar: UploadedFile) {
                return { ok: true }
            },
        )
        const form = multipart('set_avatar', { user_id: 9 }, {
            avatar: new File([new Uint8Array([1])], 'a.bin', { type: 'application/octet-stream' }),
        })
        const r = await handleMultipartCall(form)
        expect(r.status).toBe(200)
        expect(r.headers['X-Mizan-Invalidate']).toContain('avatars')
    })
})