/**
 * `createContactsPlugin` — `PluginDescriptor` factory for
 * `@suaveplan/api`. Validates options, constructs the three SurrealDB
 * repositories, registers them in the host `ServiceRegistry` + Hono
 * `ContextVariableMap`, applies the bundled SurrealQL schema, and
 * mounts the `/contacts` + `/groups` route trees via
 * `definePluginRoutes`.
 */

import type { OpenAPIHono } from "@hono/zod-openapi";
import { definePluginRoutes } from "@suaveplan/api-openapi";
import {
    definePlugin,
    type PluginContext,
    type PluginDescriptor,
} from "@suaveplan/api-plugin";
import {
    CONTACTS_API_CODES,
    ContactsApiError,
} from "../error-codes/error-codes.js";
import {
    SurrealContactRepository,
    SurrealGroupRepository,
    SurrealMembershipRepository,
} from "../repositories/index.js";
import { buildContactRoutes } from "../routes/contacts/build-routes.js";
import { buildGroupRoutes } from "../routes/groups/build-routes.js";
import { ContactsPluginOptionsSchema } from "../schemas/options.js";
import type {
    ContactsPluginConfig,
    ContactsPluginOptions,
} from "../types/types.js";
import { applyContactsSchema } from "./schema.js";
import "../context/context.js";
import "../services/registry-augmentation.js";

/**
 * Factory — returns the typed `PluginDescriptor`.
 *
 * Zod-validates `options` at construction time; invalid options
 * surface as `ContactsApiError(INVALID_INPUT)` with the `ZodError`
 * carried as `cause`. The descriptor declares
 * `dependencies: ["database", "auth"]` so the host topo-sorts after
 * `@suaveplan/api-plugin-database` and `@suaveplan/api-plugin-auth`.
 */
export function createContactsPlugin(
    options: ContactsPluginOptions = {}
): PluginDescriptor<ContactsPluginConfig> {
    const parsed = ContactsPluginOptionsSchema.safeParse(options);
    if (!parsed.success) {
        throw new ContactsApiError(
            CONTACTS_API_CODES.INVALID_INPUT,
            "createContactsPlugin received invalid options",
            { cause: parsed.error, context: { statusCode: 500 } }
        );
    }
    const resolved: ContactsPluginConfig = {
        routePrefix: parsed.data.routePrefix,
        maxImportBatchSize: parsed.data.maxImportBatchSize,
        maxGroupDepth: parsed.data.maxGroupDepth,
        enforceGroupDepth: parsed.data.enforceGroupDepth,
        applySchemaOnInit: parsed.data.applySchemaOnInit,
        ...(parsed.data.logger !== undefined
            ? { logger: parsed.data.logger }
            : {}),
    };

    return definePlugin<ContactsPluginConfig>({
        name: "contacts",
        version: "0.1.0",
        description:
            "Contacts and groups HTTP plugin for @suaveplan/api. Mounts /contacts and /groups on a Hono OpenAPIHono backed by SurrealDB.",
        dependencies: ["database", "auth"],
        defaults: resolved,
        tags: ["contacts", "groups", "audience"],
        onInit: async (ctx) => runOnInit(ctx, resolved),
    });
}

export async function runOnInit(
    ctx: PluginContext<ContactsPluginConfig>,
    config: ContactsPluginConfig
): Promise<void> {
    const app = ctx.getService("app");
    if (app === undefined) {
        throw new ContactsApiError(
            CONTACTS_API_CODES.SERVICE_NOT_AVAILABLE,
            "contacts plugin requires the `app` service in ServiceRegistry",
            { context: { missing: ["app"], statusCode: 500 } }
        );
    }
    const db = ctx.getService("db");
    if (db === undefined) {
        throw new ContactsApiError(
            CONTACTS_API_CODES.SERVICE_NOT_AVAILABLE,
            "contacts plugin requires the `db` service — load @suaveplan/api-plugin-database first",
            { context: { missing: ["db"], statusCode: 500 } }
        );
    }
    const openAPIRegistry = ctx.getService("openAPIRegistry");
    const migrationRunner = ctx.getService("migrationRunner");
    const logger = config.logger ?? ctx.logger;

    if (config.applySchemaOnInit) {
        await applyContactsSchema({
            ...(migrationRunner !== undefined ? { migrationRunner } : {}),
            db,
        });
    }

    const contactRepository = new SurrealContactRepository(db);
    const groupRepository = new SurrealGroupRepository(db, {
        maxGroupDepth: config.maxGroupDepth,
        enforceGroupDepth: config.enforceGroupDepth,
    });
    const membershipRepository = new SurrealMembershipRepository(db);

    ctx.registerService("contactRepository", contactRepository);
    ctx.registerService("groupRepository", groupRepository);
    ctx.registerService("membershipRepository", membershipRepository);

    // Inject the repositories + eventBus into every Hono request context.
    const eventBus = ctx.eventBus;
    const prefix = config.routePrefix;
    const mountPattern = prefix === "/" ? "*" : `${prefix}/*`;
    app.use(mountPattern, async (c, next) => {
        c.set("contactRepository", contactRepository);
        c.set("groupRepository", groupRepository);
        c.set("membershipRepository", membershipRepository);
        c.set("eventBus", eventBus);
        await next();
    });

    registerRoutes({
        app,
        openAPIRegistry,
        routePrefix: prefix,
        maxImportBatchSize: config.maxImportBatchSize,
        logger,
    });
}

interface RegisterRoutesArgs {
    readonly app: OpenAPIHono;
    readonly openAPIRegistry: ReturnType<
        PluginContext<ContactsPluginConfig>["getService"]
    >;
    readonly routePrefix: string;
    readonly maxImportBatchSize: number;
    readonly logger: {
        warn: (msg: string, ctx?: Readonly<Record<string, unknown>>) => void;
    };
}

function registerRoutes(args: RegisterRoutesArgs): void {
    const { app, openAPIRegistry, routePrefix, maxImportBatchSize, logger } =
        args;
    const entries = [
        ...buildContactRoutes({ maxImportBatchSize }),
        ...buildGroupRoutes(),
    ];
    if (openAPIRegistry !== undefined) {
        const reg = openAPIRegistry as {
            getRoutes: () => Array<{ path: string }>;
        };
        const collisionPrefix =
            routePrefix === "/" ? "/contacts" : `${routePrefix}/contacts`;
        const existing = reg
            .getRoutes()
            .filter((r) => r.path.startsWith(collisionPrefix));
        if (existing.length > 0) {
            throw new ContactsApiError(
                CONTACTS_API_CODES.ROUTE_PREFIX_COLLISION,
                `Route prefix '${routePrefix}' collides with previously registered routes`,
                {
                    context: {
                        prefix: routePrefix,
                        existing: existing.map((r) => r.path),
                        statusCode: 500,
                    },
                }
            );
        }
        const prefixedEntries = entries.map((entry) => ({
            ...entry,
            route: {
                ...entry.route,
                path: `${routePrefix === "/" ? "" : routePrefix}${entry.route.path}`,
            },
        }));
        definePluginRoutes(prefixedEntries, {
            app,
            registry: openAPIRegistry as Parameters<
                typeof definePluginRoutes
            >[1]["registry"],
            pluginName: "contacts",
        });
        return;
    }
    logger.warn(
        "contacts plugin: openAPIRegistry not registered — routes will not appear in /openapi.json"
    );
    for (const entry of entries) {
        const method = entry.route.method as
            | "get"
            | "post"
            | "put"
            | "patch"
            | "delete";
        const path = `${routePrefix === "/" ? "" : routePrefix}${entry.route.path}`;
        app[method](
            path,
            async (c) => (await entry.handler(c as never)) as Response
        );
    }
}