/**
 * Internal director endpoints (WP10 wiring slice).
 *
 * Process-to-process only: a shared-secret bearer (DIRECTOR_API_TOKEN) when
 * configured, plus the ref's workspace/channel UUID shape. Not registered under
 * the session RBAC guard — the scheduler worker has no browser session; its
 * authorization is the generation/version fence in DirectorService.
 */
import { BadRequestException, Body, Controller, Get, Headers, HttpCode, Inject, Param, Post } from "@nestjs/common";
import { DirectorService, type DirectorApplyBody } from "./director.service.js";

function requireToken(token: string | undefined): void {
  const expected = process.env.DIRECTOR_API_TOKEN;
  if (expected === undefined || expected === "") return; // unset = local dev, no shared secret configured
  if (token !== `Bearer ${expected}`) throw new BadRequestException("director token is invalid");
}

@Controller("internal/director/channels")
export class DirectorController {
  constructor(@Inject(DirectorService) private readonly director: DirectorService) {}

  @Get(":workspaceId/:channelId/state")
  async state(@Headers() headers: Record<string, string>, @Param("workspaceId") ws: string, @Param("channelId") ch: string): Promise<unknown> {
    requireToken(headers.authorization);
    return this.director.channelState(ws, ch);
  }

  @Get(":workspaceId/:channelId/fence")
  async fence(@Headers() headers: Record<string, string>, @Param("workspaceId") ws: string, @Param("channelId") ch: string): Promise<unknown> {
    requireToken(headers.authorization);
    return this.director.fence(ws, ch);
  }

  @Post(":workspaceId/:channelId/apply")
  @HttpCode(200)
  async apply(@Headers() headers: Record<string, string>, @Param("workspaceId") ws: string, @Param("channelId") ch: string,
    @Body() body: unknown): Promise<unknown> {
    requireToken(headers.authorization);
    return this.director.applyProgramSwitch(ws, ch, parseApply(body));
  }

  @Post(":workspaceId/:channelId/audit")
  @HttpCode(204)
  async audit(@Headers() headers: Record<string, string>, @Param("workspaceId") ws: string, @Param("channelId") ch: string,
    @Body() body: unknown): Promise<void> {
    requireToken(headers.authorization);
    const event = body as { commandId?: unknown; outcome?: unknown; reason?: unknown };
    if (typeof event.commandId !== "string" || (event.outcome !== "SUPERSEDED" && event.outcome !== "AUTHZ_REVOKED")
      || typeof event.reason !== "string") throw new BadRequestException("audit event is invalid");
    await this.director.audit(ws, ch, { commandId: event.commandId, outcome: event.outcome, reason: event.reason });
  }
}

function parseApply(body: unknown): DirectorApplyBody {
  if (typeof body !== "object" || body === null || Array.isArray(body)) throw new BadRequestException("apply body must be an object");
  const value = body as Record<string, unknown>;
  const commandId = value.commandId;
  if (typeof commandId !== "string" || commandId === "" || commandId.length > 128) throw new BadRequestException("commandId must be 1-128 characters");
  const expectedDesiredVersion = value.expectedDesiredVersion;
  if (typeof expectedDesiredVersion !== "number" || !Number.isSafeInteger(expectedDesiredVersion) || expectedDesiredVersion < 0) {
    throw new BadRequestException("expectedDesiredVersion must be a non-negative integer");
  }
  const authzEpoch = value.authzEpoch;
  if (typeof authzEpoch !== "number" || !Number.isSafeInteger(authzEpoch) || authzEpoch < 0) {
    throw new BadRequestException("authzEpoch must be a non-negative integer");
  }
  const program = value.program;
  if (typeof program !== "object" || program === null) throw new BadRequestException("program must be an object");
  const p = program as Record<string, unknown>;
  let parsedProgram: DirectorApplyBody["program"];
  if (p.kind === "sources") {
    if (!Array.isArray(p.sourceIds) || p.sourceIds.some((id) => typeof id !== "string")) throw new BadRequestException("program.sourceIds must be strings");
    parsedProgram = { kind: "sources", sourceIds: p.sourceIds };
  } else if (p.kind === "fallback") {
    if (p.sceneId !== null && typeof p.sceneId !== "string") throw new BadRequestException("program.sceneId must be a string or null");
    parsedProgram = { kind: "fallback", sceneId: p.sceneId as string | null };
  } else throw new BadRequestException("program.kind must be sources or fallback");
  const layout = value.layout;
  if (typeof layout !== "string" || layout === "") throw new BadRequestException("layout must be a non-empty string");
  if (!Array.isArray(value.reasons) || value.reasons.some((r) => typeof r !== "string")) throw new BadRequestException("reasons must be strings");
  const releaseOverride = value.releaseOverride;
  if (releaseOverride !== undefined && typeof releaseOverride !== "string") throw new BadRequestException("releaseOverride must be a string");
  return { commandId, expectedDesiredVersion, authzEpoch, program: parsedProgram, layout, reasons: value.reasons, ...(releaseOverride === undefined ? {} : { releaseOverride }) };
}