import type { Tenant } from "@suaveplan/api-tenant";
import {
    TENANT_PLUGIN_CODES,
    TenantPluginError,
} from "../error-codes/error-codes.js";
import type {
    CreateTenantInput,
    ListTenantsQuery,
    TenantStore,
    UpdateTenantInput,
} from "./store.js";

/** Test- and small-ops-friendly in-memory `TenantStore` implementation. */
export class MemoryTenantStore implements TenantStore {
    private readonly tenants = new Map<string, Tenant>();
    private nextSeq = 1;

    public async getById(id: string): Promise<Tenant | null> {
        return this.tenants.get(id) ?? null;
    }

    public async getBySlug(slug: string): Promise<Tenant | null> {
        for (const t of this.tenants.values()) {
            if (t.slug === slug) return t;
        }
        return null;
    }

    public async getByDomain(domain: string): Promise<Tenant | null> {
        for (const t of this.tenants.values()) {
            if (t.domains.includes(domain)) return t;
        }
        return null;
    }

    public async listAll(query?: ListTenantsQuery): Promise<readonly Tenant[]> {
        let rows = Array.from(this.tenants.values());
        if (query?.status !== undefined) {
            rows = rows.filter((t) => t.status === query.status);
        }
        const offset = query?.offset ?? 0;
        const limit = query?.limit ?? rows.length;
        return rows.slice(offset, offset + limit);
    }

    public async create(input: CreateTenantInput): Promise<Tenant> {
        for (const t of this.tenants.values()) {
            if (t.slug === input.slug) {
                throw new TenantPluginError(
                    TENANT_PLUGIN_CODES.TENANT_SLUG_TAKEN,
                    `Tenant slug '${input.slug}' is already taken`,
                    { context: { slug: input.slug, statusCode: 409 } }
                );
            }
        }
        const id = `tenant_${this.nextSeq++}`;
        const now = new Date();
        const tenant: Tenant = {
            id,
            name: input.name,
            slug: input.slug,
            status: input.status ?? "active",
            settings: input.settings ?? {},
            enabledPlugins: input.enabledPlugins
                ? [...input.enabledPlugins]
                : [],
            domains: input.domains ? [...input.domains] : [],
            createdAt: now,
            updatedAt: now,
            ...(input.plan !== undefined ? { plan: input.plan } : {}),
            ...(input.metadata !== undefined
                ? { metadata: input.metadata }
                : {}),
        };
        this.tenants.set(id, tenant);
        return tenant;
    }

    public async update(id: string, patch: UpdateTenantInput): Promise<Tenant> {
        const existing = this.tenants.get(id);
        if (!existing) {
            throw new TenantPluginError(
                TENANT_PLUGIN_CODES.TENANT_NOT_FOUND,
                `Tenant '${id}' not found`,
                { context: { id, statusCode: 404 } }
            );
        }
        if (patch.slug !== undefined && patch.slug !== existing.slug) {
            for (const t of this.tenants.values()) {
                if (t.id !== id && t.slug === patch.slug) {
                    throw new TenantPluginError(
                        TENANT_PLUGIN_CODES.TENANT_SLUG_TAKEN,
                        `Tenant slug '${patch.slug}' is already taken`,
                        {
                            context: {
                                slug: patch.slug,
                                statusCode: 409,
                            },
                        }
                    );
                }
            }
        }
        const updated: Tenant = {
            ...existing,
            ...(patch.name !== undefined ? { name: patch.name } : {}),
            ...(patch.slug !== undefined ? { slug: patch.slug } : {}),
            ...(patch.status !== undefined ? { status: patch.status } : {}),
            ...(patch.plan !== undefined ? { plan: patch.plan } : {}),
            ...(patch.enabledPlugins !== undefined
                ? { enabledPlugins: [...patch.enabledPlugins] }
                : {}),
            ...(patch.domains !== undefined
                ? { domains: [...patch.domains] }
                : {}),
            ...(patch.settings !== undefined
                ? { settings: patch.settings }
                : {}),
            ...(patch.metadata !== undefined
                ? { metadata: patch.metadata }
                : {}),
            updatedAt: new Date(),
        };
        this.tenants.set(id, updated);
        return updated;
    }

    public async delete(id: string): Promise<void> {
        const existing = this.tenants.get(id);
        if (!existing) {
            // Idempotent — deleting an unknown id is a no-op.
            return;
        }
        this.tenants.set(id, {
            ...existing,
            status: "deleted",
            updatedAt: new Date(),
        });
    }

    /** Test helper — number of stored entries. */
    public get size(): number {
        return this.tenants.size;
    }

    /** Test helper — drop everything. */
    public clear(): void {
        this.tenants.clear();
        this.nextSeq = 1;
    }
}