// The handlers of the branding procedures: each resolves its ports and calls one use case.

import { type Container, implement, validationFailed } from "@conusai-kit/core"
import { DATA_SOURCE, OBJECT_STORE } from "@conusai-kit/data"
import { brandGet, brandSet, logoClear, logoGet, logoSet } from "../contract/index.js"
import { type BrandingDeps, clearLogo, getBrand, readLogo, setBrand, setLogo } from "../core/brand.js"

export const brandingDeps = (container: Container): BrandingDeps => ({
  data: container.resolve(DATA_SOURCE),
  store: container.resolve(OBJECT_STORE),
})

/** Standard base64 to bytes, refusing anything else as a 422 that names the field. */
function bytesOf(body: string): Uint8Array {
  if (!/^[A-Za-z0-9+/]*={0,2}$/.test(body) || body.length % 4 !== 0) {
    throw validationFailed([{ path: "body", message: "is not standard base64" }])
  }
  return Uint8Array.from(atob(body), (char) => char.charCodeAt(0))
}

const toBase64 = (bytes: Uint8Array): string => {
  let binary = ""
  for (const byte of bytes) binary += String.fromCharCode(byte)
  return btoa(binary)
}

export const brandGetImpl = implement(brandGet, async ({ ctx }) =>
  getBrand(brandingDeps(ctx.container).data, ctx.scope),
)

export const brandSetImpl = implement(brandSet, async ({ input, ctx }) =>
  setBrand(brandingDeps(ctx.container).data, ctx.scope, {
    displayName: input.displayName,
    primary: input.primary,
    accent: input.accent,
  }),
)

export const logoSetImpl = implement(logoSet, async ({ input, ctx }) =>
  setLogo(brandingDeps(ctx.container), ctx.scope, {
    variant: input.variant,
    contentType: input.contentType,
    bytes: bytesOf(input.body),
  }),
)

export const logoClearImpl = implement(logoClear, async ({ input, ctx }) =>
  clearLogo(brandingDeps(ctx.container), ctx.scope, input.variant),
)

export const logoGetImpl = implement(logoGet, async ({ input, ctx }) => {
  const logo = await readLogo(brandingDeps(ctx.container), ctx.scope, input.variant, input.size)
  return { contentType: logo.contentType, body: toBase64(logo.bytes) }
})

export const BRANDING_PROCEDURES = [brandGetImpl, brandSetImpl, logoSetImpl, logoClearImpl, logoGetImpl]