/**
 * ADR-0027: Admin routes for organization-scoped capability connections.
 * GET    /api/org/:orgSlug/capability-connections           — list all
 * GET    /api/org/:orgSlug/capability-connections/:capId    — read one
 * PUT    /api/org/:orgSlug/capability-connections/:capId    — rotate/create
 * DELETE /api/org/:orgSlug/capability-connections/:capId    — disable
 */
import type { PrismaClient } from "@prisma/client";
import type { FastifyInstance } from "fastify";
import {
  CapabilityConnectionService,
  type CapabilityCredentialInput,
} from "../../capability/capabilityConnectionService.js";
import { CapabilityReadinessError, type CapabilityReadinessProbe } from "../../capability/capabilityReadiness.js";
import { secretKindForCapability } from "../../capability/types.js";
import type { LocalSecretEnvelope } from "../../security/secretEnvelope.js";
import { requireOrgRole, type GuardDeps } from "../auth/guards.js";
import { handleRouteError } from "../errors.js";

export interface CapabilityConnectionRouteConfig {
  readonly prisma: PrismaClient;
  readonly sessionSecret: string;
  readonly secretEnvelope: LocalSecretEnvelope;
  readonly readinessProbe?: CapabilityReadinessProbe;
}

export async function registerCapabilityConnectionRoutes(
  app: FastifyInstance,
  config: CapabilityConnectionRouteConfig,
): Promise<void> {
  const guardDeps: GuardDeps = { prisma: config.prisma, sessionSecret: config.sessionSecret };
  const connections =
    config.readinessProbe === undefined
      ? new CapabilityConnectionService(config.prisma, config.secretEnvelope)
      : new CapabilityConnectionService(config.prisma, config.secretEnvelope, config.readinessProbe);

  app.get("/api/org/:orgSlug/capability-connections", async (request, reply) => {
    try {
      const { orgSlug } = request.params as { orgSlug: string };
      const auth = await requireOrgRole(request, reply, guardDeps, { orgSlug });
      if (auth === null) return;
      return { connections: await connections.list(auth.organization.id) };
    } catch (error) {
      request.log.error({ requestId: request.id, operation: "capability_connection.list" }, "list failed");
      return handleRouteError(reply, error);
    }
  });

  app.get("/api/org/:orgSlug/capability-connections/:capabilityId", async (request, reply) => {
    try {
      const { orgSlug, capabilityId } = request.params as { orgSlug: string; capabilityId: string };
      const auth = await requireOrgRole(request, reply, guardDeps, { orgSlug });
      if (auth === null) return;
      return { connection: await connections.read(auth.organization.id, capabilityId) };
    } catch (error) {
      request.log.error({ requestId: request.id, operation: "capability_connection.read" }, "read failed");
      return handleRouteError(reply, error);
    }
  });

  app.put("/api/org/:orgSlug/capability-connections/:capabilityId", async (request, reply) => {
    try {
      const { orgSlug, capabilityId } = request.params as { orgSlug: string; capabilityId: string };
      const auth = await requireOrgRole(request, reply, guardDeps, { orgSlug });
      if (auth === null) return;
      const credential = parseCredentialBody(capabilityId, request.body);
      const result = await connections.rotate({
        organizationId: auth.organization.id,
        capabilityId,
        actorUserId: auth.user.id,
        credential,
      });
      request.log.info({
        organizationId: auth.organization.id,
        capabilityId,
        connectionId: result.id,
        status: result.status,
        secretVersion: result.activeVersion,
      }, result.created ? "Capability Connection created" : "Capability Connection rotated");
      const { created, ...metadata } = result;
      return reply.status(created ? 201 : 200).send(metadata);
    } catch (error) {
      const facts = error instanceof CapabilityReadinessError
        ? {
            errorCode: error.code,
            failureCategory: error.category,
            ...(error.upstreamStatus !== undefined ? { upstreamStatus: error.upstreamStatus } : {}),
          }
        : { errorCode: "capability_connection_write_failed" };
      request.log.error({ requestId: request.id, operation: "capability_connection.rotate", ...facts }, "rotate failed");
      return handleRouteError(reply, error);
    }
  });

  app.delete("/api/org/:orgSlug/capability-connections/:capabilityId", async (request, reply) => {
    try {
      const { orgSlug, capabilityId } = request.params as { orgSlug: string; capabilityId: string };
      const auth = await requireOrgRole(request, reply, guardDeps, { orgSlug });
      if (auth === null) return;
      const result = await connections.disable({
        organizationId: auth.organization.id,
        capabilityId,
        actorUserId: auth.user.id,
      });
      request.log.info({
        organizationId: auth.organization.id,
        capabilityId,
        connectionId: result.id,
        status: result.status,
      }, "Capability Connection disabled");
      return reply.send(result);
    } catch (error) {
      request.log.error({ requestId: request.id, operation: "capability_connection.disable" }, "disable failed");
      return handleRouteError(reply, error);
    }
  });
}

function parseCredentialBody(capabilityId: string, value: unknown): CapabilityCredentialInput {
  if (typeof value !== "object" || value === null || Array.isArray(value)) {
    throw new Error("invalid capability credential body");
  }
  const body = value as Record<string, unknown>;
  const expectedKind = secretKindForCapability(capabilityId);
  const kind =
    body.kind === "docmind" || body.kind === "pbank"
      ? body.kind
      : expectedKind;

  if (kind !== expectedKind) {
    throw new Error(`capability ${capabilityId} requires kind=${expectedKind}`);
  }

  if (kind === "docmind") {
    return {
      kind: "docmind",
      accessKeyId: requireStringField(body, "accessKeyId"),
      accessKeySecret: requireStringField(body, "accessKeySecret"),
      endpoint: requireStringField(body, "endpoint"),
    };
  }

  const rightsStatus = optionalStringField(body, "rightsStatus");
  const rightsHolder = optionalStringField(body, "rightsHolder");
  const rightsScope = optionalStringField(body, "rightsScope");
  const rightsNote = optionalStringField(body, "rightsNote");
  return {
    kind: "pbank",
    baseUrl: requireStringField(body, "baseUrl"),
    username: requireStringField(body, "username"),
    password: requireStringField(body, "password"),
    ...(rightsStatus !== undefined ? { rightsStatus } : {}),
    ...(rightsHolder !== undefined ? { rightsHolder } : {}),
    ...(rightsScope !== undefined ? { rightsScope } : {}),
    ...(rightsNote !== undefined ? { rightsNote } : {}),
  };
}

function requireStringField(body: Record<string, unknown>, name: string): string {
  const value = body[name];
  if (typeof value !== "string" || value.trim() === "") {
    throw new Error(`${name} is required`);
  }
  return value;
}

function optionalStringField(body: Record<string, unknown>, name: string): string | undefined {
  const value = body[name];
  if (typeof value !== "string") return undefined;
  const trimmed = value.trim();
  return trimmed === "" ? undefined : trimmed;
}