import {
  batchDeleteAppIndexDocumentsSchema,
  batchUpsertAppIndexDocumentsSchema,
  colineAppRegistrationPayloadSchema,
  createNotificationInputSchema,
  emitAmbientEventsInputSchema,
  appPermissionSchema,
  type AppPermission,
  type BatchDeleteAppIndexDocumentsInput,
  type BatchUpsertAppIndexDocumentsInput,
  type ColineAppRegistrationPayload,
  type CreateNotificationInputInput,
  type EmitAmbientEventsInputInput,
} from "./manifest";

interface ApiErrorPayload {
  error?: {
    code?: string;
    message?: string;
  };
}

async function parseApiResponse<T>(response: Response): Promise<T> {
  const payload = (await response.json().catch(() => null)) as
    | { data?: T; error?: ApiErrorPayload["error"] }
    | null;

  if (!response.ok) {
    throw new Error(
      payload?.error?.message ?? `Request failed (${response.status}).`,
    );
  }

  if (!payload || !("data" in payload)) {
    throw new Error("Invalid API response.");
  }

  return payload.data as T;
}

export interface ColineApiClientOptions {
  baseUrl: string;
  apiKey?: string;
  fetch?: typeof fetch;
}

export interface RegisteredAppRecord {
  appId: string;
  appKey: string;
  name: string;
  description: string | null;
  iconUrl: string | null;
  status: "draft" | "active" | "disabled" | "archived";
  ownerUserId: string | null;
  latestPublishedVersion: string | null;
}

export interface RegisteredAppDetail extends RegisteredAppRecord {
  latestPublishedVersionId: string | null;
}

export interface RegisteredAppVersionSummary {
  versionId: string;
  version: string;
  status: "draft" | "published" | "deprecated";
  apiBaseUrl: string;
  permissions: string[];
  fileTypes: Array<{
    typeKey: string;
    name: string;
    description: string | null;
  }>;
  createdAt: string;
  updatedAt: string;
}

export interface WorkspaceInstalledApp {
  installId: string;
  appId: string;
  appKey: string;
  name: string;
  description: string | null;
  iconUrl: string | null;
  status: "active" | "suspended" | "revoked";
  installScope: "workspace" | "user";
  scopeSubjectId: string;
  version: string | null;
}

export interface WorkspaceAppCatalogItem {
  appId: string;
  appKey: string;
  name: string;
  description: string | null;
  iconUrl: string | null;
  status: "draft" | "active" | "disabled" | "archived";
  latestPublishedVersion: string | null;
  latestPublishedVersionId: string | null;
  isInstalled: boolean;
}

export interface WorkspaceAppsResponse {
  installedApps: WorkspaceInstalledApp[];
  catalog: WorkspaceAppCatalogItem[];
  permissions: {
    canManageApps: boolean;
  };
}

export interface InstallWorkspaceAppInput {
  appId: string;
  pinnedVersionId?: string;
  grantedPermissions?: AppPermission[];
}

export interface InstallWorkspaceAppResponse {
  installId: string;
  appId: string;
  appKey: string;
  version: string;
  grantedPermissions: AppPermission[];
}

export interface WorkspaceAppPermissionsResponse {
  install: WorkspaceInstalledApp;
  availablePermissions: string[];
  grantedPermissions: string[];
  permissions: {
    canManageApps: boolean;
  };
}

export interface WorkspaceInstalledAppResponse {
  install: WorkspaceInstalledApp;
  permissions: {
    canManageApps: boolean;
  };
}

export interface UpdateWorkspaceAppPermissionsInput {
  grantedPermissions: AppPermission[];
}

function joinUrl(baseUrl: string, path: string): string {
  return `${baseUrl.replace(/\/+$/, "")}${path}`;
}

export class ColineApiClient {
  private readonly baseUrl: string;
  private readonly apiKey: string | undefined;
  private readonly fetchImpl: typeof fetch;

  constructor(options: ColineApiClientOptions) {
    this.baseUrl = options.baseUrl;
    this.apiKey = options.apiKey;
    this.fetchImpl = options.fetch ?? fetch;
  }

  private async request<T>(path: string, init?: RequestInit): Promise<T> {
    const headers = new Headers(init?.headers);

    if (!headers.has("Content-Type") && init?.body) {
      headers.set("Content-Type", "application/json");
    }

    if (this.apiKey && !headers.has("Authorization")) {
      headers.set("Authorization", `Bearer ${this.apiKey}`);
    }

    const response = await this.fetchImpl(joinUrl(this.baseUrl, path), {
      ...init,
      headers,
    });

    return parseApiResponse<T>(response);
  }

  async listApps(): Promise<{ apps: RegisteredAppRecord[] }> {
    return this.request<{ apps: RegisteredAppRecord[] }>("/api/apps");
  }

  async getApp(appKey: string): Promise<{ app: RegisteredAppDetail }> {
    return this.request<{ app: RegisteredAppDetail }>(`/api/apps/${appKey}`);
  }

  async listAppVersions(
    appKey: string,
  ): Promise<{ versions: RegisteredAppVersionSummary[] }> {
    return this.request<{ versions: RegisteredAppVersionSummary[] }>(
      `/api/apps/${appKey}/versions`,
    );
  }

  async registerApp(
    payload: ColineAppRegistrationPayload,
  ): Promise<{ appId: string; appKey: string; versionId: string; version: string }> {
    const body = colineAppRegistrationPayloadSchema.parse(payload);

    return this.request<{
      appId: string;
      appKey: string;
      versionId: string;
      version: string;
    }>("/api/apps", {
      method: "POST",
      body: JSON.stringify(body),
    });
  }

  async listWorkspaceApps(workspaceSlug: string): Promise<WorkspaceAppsResponse> {
    return this.request<WorkspaceAppsResponse>(
      `/api/workspaces/${workspaceSlug}/apps`,
    );
  }

  async installWorkspaceApp(
    workspaceSlug: string,
    input: InstallWorkspaceAppInput,
  ): Promise<InstallWorkspaceAppResponse> {
    const grantedPermissions = input.grantedPermissions
      ? input.grantedPermissions.map((permission) =>
          appPermissionSchema.parse(permission),
        )
      : undefined;

    return this.request<InstallWorkspaceAppResponse>(
      `/api/workspaces/${workspaceSlug}/apps`,
      {
        method: "POST",
        body: JSON.stringify({
          appId: input.appId,
          ...(input.pinnedVersionId
            ? { pinnedVersionId: input.pinnedVersionId }
            : {}),
          ...(grantedPermissions ? { grantedPermissions } : {}),
        }),
      },
    );
  }

  async getWorkspaceAppPermissions(
    workspaceSlug: string,
    appKey: string,
  ): Promise<WorkspaceAppPermissionsResponse> {
    return this.request<WorkspaceAppPermissionsResponse>(
      `/api/workspaces/${workspaceSlug}/apps/${appKey}/permissions`,
    );
  }

  async getWorkspaceInstalledApp(
    workspaceSlug: string,
    appKey: string,
  ): Promise<WorkspaceInstalledAppResponse> {
    return this.request<WorkspaceInstalledAppResponse>(
      `/api/workspaces/${workspaceSlug}/apps/${appKey}`,
    );
  }

  async updateWorkspaceAppPermissions(
    workspaceSlug: string,
    appKey: string,
    input: UpdateWorkspaceAppPermissionsInput,
  ): Promise<WorkspaceAppPermissionsResponse> {
    return this.request<WorkspaceAppPermissionsResponse>(
      `/api/workspaces/${workspaceSlug}/apps/${appKey}/permissions`,
      {
        method: "PUT",
        body: JSON.stringify({
          grantedPermissions: input.grantedPermissions.map((permission) =>
            appPermissionSchema.parse(permission),
          ),
        }),
      },
    );
  }

  async uninstallWorkspaceApp(
    workspaceSlug: string,
    appKey: string,
  ): Promise<{ ok: true }> {
    return this.request<{ ok: true }>(
      `/api/workspaces/${workspaceSlug}/apps/${appKey}`,
      {
        method: "DELETE",
      },
    );
  }

  async emitAppAmbientEvents(
    workspaceSlug: string,
    appKey: string,
    input: EmitAmbientEventsInputInput,
  ): Promise<{ events: Array<{ id: string; dedupeKey: string }> }> {
    const body = emitAmbientEventsInputSchema.parse(input);

    return this.request<{ events: Array<{ id: string; dedupeKey: string }> }>(
      `/api/v1/workspaces/${workspaceSlug}/apps/${appKey}/ambient/events`,
      {
        method: "POST",
        body: JSON.stringify(body),
      },
    );
  }

  async createAppNotification(
    workspaceSlug: string,
    appKey: string,
    input: CreateNotificationInputInput,
  ): Promise<{ ok: true }> {
    const body = createNotificationInputSchema.parse(input);

    return this.request<{ ok: true }>(
      `/api/workspaces/${workspaceSlug}/apps/${appKey}/notifications`,
      {
        method: "POST",
        body: JSON.stringify(body),
      },
    );
  }

  async upsertAppIndexDocuments(
    workspaceSlug: string,
    appKey: string,
    input: BatchUpsertAppIndexDocumentsInput,
  ): Promise<{ documents: Array<{ id: string; documentKey: string; visibilityMode: string }> }> {
    const body = batchUpsertAppIndexDocumentsSchema.parse(input);

    return this.request<{
      documents: Array<{ id: string; documentKey: string; visibilityMode: string }>;
    }>(`/api/workspaces/${workspaceSlug}/apps/${appKey}/index-documents`, {
      method: "POST",
      body: JSON.stringify(body),
    });
  }

  async deleteAppIndexDocuments(
    workspaceSlug: string,
    appKey: string,
    input: BatchDeleteAppIndexDocumentsInput,
  ): Promise<{ deleted: Array<{ id: string; documentKey: string }> }> {
    const body = batchDeleteAppIndexDocumentsSchema.parse(input);

    return this.request<{ deleted: Array<{ id: string; documentKey: string }> }>(
      `/api/workspaces/${workspaceSlug}/apps/${appKey}/index-documents`,
      {
        method: "DELETE",
        body: JSON.stringify(body),
      },
    );
  }
}