/**
 * Shapes (typed query projection) + Forms (schema / validate / submit) tests.
 *
 * Shapes prove over-fetch elimination: the projected record carries only the
 * declared fields + nested relations, nothing else. Forms prove the three
 * roles register as dispatchable `@client` functions carrying the IR's
 * `form`/`form-name`/`form-role` meta, and that validate/submit enforce the
 * declared field rules.
 */

import { describe, test, expect, beforeEach } from 'bun:test'
import {
    clearRegistry,
    getFunction,
    handleMutationCall,
    Shape,
    project,
    registerForm,
    formSchema,
    validateForm,
    type QueryProjection,
} from '../src'

describe('Shapes — typed query projection', () => {
    test('keeps only declared scalar fields', () => {
        const projection: QueryProjection = { fields: ['id', 'name'] }
        const out = project([{ id: 1, name: 'A', secret: 'x', internal: 42 }], projection)
        expect(out).toEqual([{ id: 1, name: 'A' }])
        expect(out[0]).not.toHaveProperty('secret')
        expect(out[0]).not.toHaveProperty('internal')
    })

    test('prunes nested relations recursively', () => {
        const projection: QueryProjection = {
            fields: ['id'],
            relations: { orders: { fields: ['total'] } },
        }
        const out = project(
            [{ id: 1, name: 'drop', orders: [{ id: 9, total: 100, hidden: true }] }],
            projection,
        )
        expect(out).toEqual([{ id: 1, orders: [{ total: 100 }] }])
        expect(out[0].orders[0]).not.toHaveProperty('hidden')
    })

    test('handles single-object relation + null', () => {
        const projection: QueryProjection = {
            fields: ['id'],
            relations: { profile: { fields: ['bio'] } },
        }
        const out = project(
            [
                { id: 1, profile: { bio: 'hi', age: 30 } },
                { id: 2, profile: null },
            ],
            projection,
        )
        expect(out[0]).toEqual({ id: 1, profile: { bio: 'hi' } })
        expect(out[1]).toEqual({ id: 2, profile: null })
    })

    test('Shape.query binds a projection to a source', () => {
        const UserShape = new Shape('user', { fields: ['id', 'email'] })
        const out = UserShape.query([{ id: 1, email: 'a@b.c', password: 'nope' }])
        expect(out).toEqual([{ id: 1, email: 'a@b.c' }])
    })
})

describe('Forms — schema / validate / submit', () => {
    beforeEach(() => clearRegistry())

    const contactForm = {
        fields: [
            { name: 'email', type: 'email', required: true, label: 'Email' },
            {
                name: 'age',
                type: 'number',
                required: false,
                validate: (v: unknown) => (Number(v) < 0 ? 'must be non-negative' : null),
            },
        ],
    }

    test('formSchema produces field definitions', () => {
        const schema = formSchema(contactForm)
        expect(schema.fields).toHaveLength(2)
        expect(schema.fields[0]).toEqual({
            name: 'email',
            type: 'email',
            required: true,
            label: 'Email',
            helpText: '',
            choices: null,
            initial: null,
        })
        // Default label derived from name when omitted.
        expect(schema.fields[1].label).toBe('Age')
    })

    test('validateForm: required + custom validator', () => {
        expect(validateForm(contactForm, { email: 'a@b.c' }).valid).toBe(true)
        expect(validateForm(contactForm, {}).errors.email).toEqual(['This field is required.'])
        expect(validateForm(contactForm, { email: 'a@b.c', age: -1 }).errors.age).toEqual([
            'must be non-negative',
        ])
    })

    test('registerForm registers schema + validate + submit with form meta', () => {
        const reg = registerForm(contactForm, 'contact', {
            submit: async (data) => ({ saved: data.email }),
        })
        expect(reg).toEqual({ schema: 'contact-schema', validate: 'contact-validate', submit: 'contact-submit' })

        for (const [wire, role] of [
            ['contact-schema', 'schema'],
            ['contact-validate', 'validate'],
            ['contact-submit', 'submit'],
        ] as const) {
            const entry = getFunction(wire)
            expect(entry).toBeDefined()
            expect(entry!.form).toBe(true)
            expect(entry!.formName).toBe('contact')
            expect(entry!.formRole).toBe(role)
        }
    })

    test('schema function dispatches to the field defs', async () => {
        registerForm(contactForm, 'contact')
        const r = await handleMutationCall('contact-schema', {})
        expect(r.status).toBe(200)
        expect(r.body.result.fields).toHaveLength(2)
    })

    test('validate function dispatches and rejects bad data', async () => {
        registerForm(contactForm, 'contact')
        const ok = await handleMutationCall('contact-validate', { data: { email: 'a@b.c' } })
        expect(ok.body.result.valid).toBe(true)

        const bad = await handleMutationCall('contact-validate', { data: {} })
        expect(bad.body.result.valid).toBe(false)
        expect(bad.body.result.errors.email).toBeDefined()
    })

    test('submit validates then runs the handler', async () => {
        let handled: any = null
        registerForm(contactForm, 'contact', {
            submit: async (data) => {
                handled = data
                return { id: 7 }
            },
        })

        const ok = await handleMutationCall('contact-submit', { data: { email: 'a@b.c' } })
        expect(ok.body.result).toEqual({ ok: true, result: { id: 7 } })
        expect(handled).toEqual({ email: 'a@b.c' })

        const bad = await handleMutationCall('contact-submit', { data: {} })
        expect(bad.body.result.ok).toBe(false)
        expect(bad.body.result.errors.email).toBeDefined()
    })

    test('submit not registered without a handler', () => {
        const reg = registerForm(contactForm, 'noSubmit')
        expect(reg.submit).toBeUndefined()
        expect(getFunction('noSubmit-submit')).toBeUndefined()
    })
})