/**
 * Cart module — cosmolocal print-on-demand shop.
 *
 * Ported from /opt/apps/rcart/ (Express → Hono).
 * Handles catalog (artifact listings), orders, fulfillment resolution.
 * Integrates with provider-registry for provider matching and flow-service for revenue splits.
 */

import { Hono } from "hono";
import { readFileSync } from "node:fs";
import { resolve } from "node:path";
import { sql } from "../../shared/db/pool";
import { renderShell } from "../../server/shell";
import { getModuleInfoList } from "../../shared/module";
import { depositOrderRevenue } from "./flow";
import type { RSpaceModule } from "../../shared/module";

const routes = new Hono();

// ── DB initialization ──
const SCHEMA_SQL = readFileSync(resolve(import.meta.dir, "db/schema.sql"), "utf-8");

async function initDB() {
	try {
		await sql.unsafe(SCHEMA_SQL);
		console.log("[Cart] DB schema initialized");
	} catch (e) {
		console.error("[Cart] DB init error:", e);
	}
}

initDB();

// Provider registry URL (for fulfillment resolution)
const PROVIDER_REGISTRY_URL = process.env.PROVIDER_REGISTRY_URL || "";

function getProviderUrl(): string {
	// In unified mode, providers module is co-located — call its routes directly via internal URL
	// In standalone mode, use PROVIDER_REGISTRY_URL env
	return PROVIDER_REGISTRY_URL || "http://localhost:3000/demo/providers";
}

// ── CATALOG ROUTES ──

// POST /api/catalog/ingest — Add artifact to catalog
routes.post("/api/catalog/ingest", async (c) => {
	const artifact = await c.req.json();

	if (!artifact.id || !artifact.schema_version || !artifact.type) {
		return c.json({ error: "Invalid artifact envelope. Required: id, schema_version, type" }, 400);
	}
	if (artifact.type !== "print-ready") {
		return c.json({ error: `Only 'print-ready' artifacts can be listed. Got: '${artifact.type}'` }, 400);
	}
	if (!artifact.render_targets || Object.keys(artifact.render_targets).length === 0) {
		return c.json({ error: "print-ready artifacts must have at least one render_target" }, 400);
	}

	const existing = await sql.unsafe("SELECT id FROM rcart.catalog_entries WHERE artifact_id = $1", [artifact.id]);
	if (existing.length > 0) {
		return c.json({ error: "Artifact already listed", catalog_entry_id: existing[0].id }, 409);
	}

	const result = await sql.unsafe(
		`INSERT INTO rcart.catalog_entries (
			artifact_id, artifact, title, product_type,
			required_capabilities, substrates, creator_id,
			source_space, tags
		) VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9)
		RETURNING id, artifact_id, title, product_type, status, created_at`,
		[
			artifact.id, JSON.stringify(artifact),
			artifact.payload?.title || "Untitled",
			artifact.spec?.product_type || null,
			artifact.spec?.required_capabilities || [],
			artifact.spec?.substrates || [],
			artifact.creator?.id || null,
			artifact.source_space || null,
			artifact.payload?.tags || [],
		]
	);

	return c.json(result[0], 201);
});

// GET /api/catalog — Browse catalog
routes.get("/api/catalog", async (c) => {
	const { product_type, capability, tag, source_space, q, limit = "50", offset = "0" } = c.req.query();

	const conditions: string[] = ["status = 'active'"];
	const params: unknown[] = [];
	let paramIdx = 1;

	if (product_type) {
		conditions.push(`product_type = $${paramIdx}`);
		params.push(product_type);
		paramIdx++;
	}
	if (capability) {
		conditions.push(`required_capabilities && $${paramIdx}`);
		params.push(capability.split(","));
		paramIdx++;
	}
	if (tag) {
		conditions.push(`$${paramIdx} = ANY(tags)`);
		params.push(tag);
		paramIdx++;
	}
	if (source_space) {
		conditions.push(`source_space = $${paramIdx}`);
		params.push(source_space);
		paramIdx++;
	}
	if (q) {
		conditions.push(`title ILIKE $${paramIdx}`);
		params.push(`%${q}%`);
		paramIdx++;
	}

	const where = conditions.join(" AND ");
	const limitNum = Math.min(parseInt(limit) || 50, 100);
	const offsetNum = parseInt(offset) || 0;

	const [result, countResult] = await Promise.all([
		sql.unsafe(
			`SELECT id, artifact_id, title, product_type,
				required_capabilities, tags, source_space,
				artifact->'payload'->>'description' as description,
				artifact->'pricing' as pricing,
				artifact->'spec'->'dimensions' as dimensions,
				status, created_at
			FROM rcart.catalog_entries
			WHERE ${where}
			ORDER BY created_at DESC
			LIMIT ${limitNum} OFFSET ${offsetNum}`,
			params
		),
		sql.unsafe(`SELECT count(*) FROM rcart.catalog_entries WHERE ${where}`, params),
	]);

	return c.json({ entries: result, total: parseInt(countResult[0].count as string), limit: limitNum, offset: offsetNum });
});

// GET /api/catalog/:id — Single catalog entry
routes.get("/api/catalog/:id", async (c) => {
	const id = c.req.param("id");
	const result = await sql.unsafe(
		"SELECT * FROM rcart.catalog_entries WHERE id = $1 OR artifact_id = $1",
		[id]
	);
	if (result.length === 0) return c.json({ error: "Catalog entry not found" }, 404);
	const row = result[0];
	return c.json({ id: row.id, artifact: row.artifact, status: row.status, created_at: row.created_at, updated_at: row.updated_at });
});

// PATCH /api/catalog/:id — Update listing status
routes.patch("/api/catalog/:id", async (c) => {
	const { status } = await c.req.json();
	const valid = ["active", "paused", "sold_out", "removed"];
	if (!valid.includes(status)) return c.json({ error: `status must be one of: ${valid.join(", ")}` }, 400);

	const result = await sql.unsafe(
		"UPDATE rcart.catalog_entries SET status = $1, updated_at = NOW() WHERE id = $2 RETURNING id, status",
		[status, c.req.param("id")]
	);
	if (result.length === 0) return c.json({ error: "Catalog entry not found" }, 404);
	return c.json(result[0]);
});

// ── ORDER ROUTES ──

// POST /api/orders — Create an order
routes.post("/api/orders", async (c) => {
	const body = await c.req.json();
	const {
		catalog_entry_id, artifact_id, buyer_id, buyer_location, buyer_contact,
		provider_id, provider_name, provider_distance_km,
		quantity = 1, production_cost, creator_payout, community_payout,
		total_price, currency = "USD", payment_method = "manual",
		payment_tx, payment_network,
	} = body;

	if (!catalog_entry_id && !artifact_id) return c.json({ error: "Required: catalog_entry_id or artifact_id" }, 400);
	if (!provider_id || !total_price) return c.json({ error: "Required: provider_id, total_price" }, 400);

	const entryResult = await sql.unsafe(
		"SELECT id, artifact_id FROM rcart.catalog_entries WHERE id = $1 OR artifact_id = $1",
		[catalog_entry_id || artifact_id]
	);
	if (entryResult.length === 0) return c.json({ error: "Catalog entry not found" }, 404);

	const entry = entryResult[0];

	// x402 detection
	const x402Header = c.req.header("x-payment");
	const effectiveMethod = x402Header ? "x402" : payment_method;
	const initialStatus = x402Header ? "paid" : "pending";

	const result = await sql.unsafe(
		`INSERT INTO rcart.orders (
			catalog_entry_id, artifact_id, buyer_id, buyer_location, buyer_contact,
			provider_id, provider_name, provider_distance_km,
			quantity, production_cost, creator_payout, community_payout,
			total_price, currency, status, payment_method, payment_tx, payment_network
			${initialStatus === "paid" ? ", paid_at" : ""}
		) VALUES ($1,$2,$3,$4,$5,$6,$7,$8,$9,$10,$11,$12,$13,$14,$15,$16,$17,$18
			${initialStatus === "paid" ? ", NOW()" : ""})
		RETURNING *`,
		[
			entry.id, entry.artifact_id,
			buyer_id || null,
			buyer_location ? JSON.stringify(buyer_location) : null,
			buyer_contact ? JSON.stringify(buyer_contact) : null,
			provider_id, provider_name || null, provider_distance_km || null,
			quantity, production_cost || null, creator_payout || null, community_payout || null,
			total_price, currency, initialStatus, effectiveMethod,
			payment_tx || null, payment_network || null,
		]
	);

	const order = result[0];
	if (initialStatus === "paid") {
		depositOrderRevenue(total_price, order.id);
	}

	return c.json(order, 201);
});

// GET /api/orders — List orders
routes.get("/api/orders", async (c) => {
	const { status, provider_id, buyer_id, limit = "50", offset = "0" } = c.req.query();

	const conditions: string[] = [];
	const params: unknown[] = [];
	let paramIdx = 1;

	if (status) { conditions.push(`o.status = $${paramIdx}`); params.push(status); paramIdx++; }
	if (provider_id) { conditions.push(`o.provider_id = $${paramIdx}`); params.push(provider_id); paramIdx++; }
	if (buyer_id) { conditions.push(`o.buyer_id = $${paramIdx}`); params.push(buyer_id); paramIdx++; }

	const where = conditions.length > 0 ? `WHERE ${conditions.join(" AND ")}` : "";
	const limitNum = Math.min(parseInt(limit) || 50, 100);
	const offsetNum = parseInt(offset) || 0;

	const result = await sql.unsafe(
		`SELECT o.*, c.title as artifact_title, c.product_type
		FROM rcart.orders o JOIN rcart.catalog_entries c ON c.id = o.catalog_entry_id
		${where} ORDER BY o.created_at DESC LIMIT ${limitNum} OFFSET ${offsetNum}`,
		params
	);

	return c.json({ orders: result });
});

// GET /api/orders/:id — Single order
routes.get("/api/orders/:id", async (c) => {
	const result = await sql.unsafe(
		`SELECT o.*, c.artifact as artifact_envelope, c.title as artifact_title
		FROM rcart.orders o JOIN rcart.catalog_entries c ON c.id = o.catalog_entry_id
		WHERE o.id = $1`,
		[c.req.param("id")]
	);
	if (result.length === 0) return c.json({ error: "Order not found" }, 404);
	return c.json(result[0]);
});

// PATCH /api/orders/:id/status — Update order status
routes.patch("/api/orders/:id/status", async (c) => {
	const body = await c.req.json();
	const { status, payment_tx, payment_network } = body;
	const valid = ["pending", "paid", "accepted", "in_production", "ready", "shipped", "completed", "cancelled"];
	if (!valid.includes(status)) return c.json({ error: `status must be one of: ${valid.join(", ")}` }, 400);

	const timestampField: Record<string, string> = { paid: "paid_at", accepted: "accepted_at", completed: "completed_at" };
	const extraSet = timestampField[status] ? `, ${timestampField[status]} = NOW()` : "";

	// Use parameterized query for payment info
	let paymentSet = "";
	const params: unknown[] = [status, c.req.param("id")];
	if (status === "paid" && payment_tx) {
		paymentSet = `, payment_tx = $3, payment_network = $4`;
		params.push(payment_tx, payment_network || null);
	}

	const result = await sql.unsafe(
		`UPDATE rcart.orders SET status = $1, updated_at = NOW()${extraSet}${paymentSet} WHERE id = $2 RETURNING *`,
		params
	);
	if (result.length === 0) return c.json({ error: "Order not found" }, 404);

	const updated = result[0];
	if (status === "paid" && updated.total_price) {
		depositOrderRevenue(updated.total_price, c.req.param("id"));
	}

	return c.json(updated);
});

// ── FULFILLMENT ROUTES ──

function round2(n: number): number {
	return Math.round(n * 100) / 100;
}

interface ProviderMatch {
	id: string; name: string; distance_km: number;
	location: { city: string; region: string; country: string };
	turnaround: { standard_days: number; rush_days: number; rush_surcharge_pct: number };
	pricing: Record<string, { base_price: number; per_unit: number; per_unit_label: string; currency: string; volume_breaks?: { min_qty: number; per_unit: number }[] }>;
	wallet: string;
}

function composeCost(artifact: Record<string, unknown>, provider: ProviderMatch, quantity: number) {
	const spec = artifact.spec as Record<string, unknown> | undefined;
	const capabilities = (spec?.required_capabilities as string[]) || [];
	const pages = (spec?.pages as number) || 1;
	const breakdown: { label: string; amount: number }[] = [];

	for (const cap of capabilities) {
		const capPricing = provider.pricing?.[cap];
		if (!capPricing) continue;

		const basePrice = capPricing.base_price || 0;
		let perUnit = capPricing.per_unit || 0;
		const unitLabel = capPricing.per_unit_label || "per unit";

		if (capPricing.volume_breaks) {
			for (const vb of capPricing.volume_breaks) {
				if (quantity >= vb.min_qty) perUnit = vb.per_unit;
			}
		}

		let units = quantity;
		if (unitLabel.includes("page")) units = pages * quantity;

		if (basePrice > 0) breakdown.push({ label: `${cap} setup`, amount: round2(basePrice) });
		breakdown.push({ label: `${cap} (${units} x $${perUnit} ${unitLabel})`, amount: round2(perUnit * units) });
	}

	if (breakdown.length === 0) {
		breakdown.push({ label: "Production (estimated)", amount: round2(2.0 * quantity) });
	}

	return breakdown;
}

// POST /api/fulfill/resolve — Find fulfillment options
routes.post("/api/fulfill/resolve", async (c) => {
	const body = await c.req.json();
	const { artifact_id, catalog_entry_id, buyer_location, quantity = 1 } = body;

	if (!buyer_location?.lat || !buyer_location?.lng) {
		return c.json({ error: "Required: buyer_location.lat, buyer_location.lng" }, 400);
	}
	if (!artifact_id && !catalog_entry_id) {
		return c.json({ error: "Required: artifact_id or catalog_entry_id" }, 400);
	}

	const entryResult = await sql.unsafe(
		"SELECT * FROM rcart.catalog_entries WHERE (artifact_id = $1 OR id = $1) AND status = 'active'",
		[artifact_id || catalog_entry_id]
	);
	if (entryResult.length === 0) return c.json({ error: "Artifact not found in catalog" }, 404);

	const entry = entryResult[0];
	const artifact = entry.artifact;
	const capabilities = artifact.spec?.required_capabilities || [];
	const substrates = artifact.spec?.substrates || [];

	if (capabilities.length === 0) {
		return c.json({ error: "Artifact has no required_capabilities" }, 400);
	}

	// Query provider registry (internal module or external service)
	const providerUrl = getProviderUrl();
	const params = new URLSearchParams({
		capabilities: capabilities.join(","),
		lat: String(buyer_location.lat),
		lng: String(buyer_location.lng),
	});
	if (substrates.length > 0) params.set("substrates", substrates.join(","));

	let providers: ProviderMatch[];
	try {
		const resp = await fetch(`${providerUrl}/api/providers/match?${params}`);
		if (!resp.ok) throw new Error(`Provider registry returned ${resp.status}`);
		const data = await resp.json() as { matches?: ProviderMatch[] };
		providers = data.matches || [];
	} catch (err) {
		return c.json({ error: "Failed to query provider registry", detail: err instanceof Error ? err.message : String(err) }, 502);
	}

	if (providers.length === 0) {
		return c.json({ options: [], message: "No local providers found", artifact_id: artifact.id });
	}

	const options = providers.map((provider) => {
		const costBreakdown = composeCost(artifact, provider, quantity);
		const productionCost = costBreakdown.reduce((sum, item) => sum + item.amount, 0);
		const pricing = artifact.pricing || {};
		const creatorPct = (pricing.creator_share_pct || 30) / 100;
		const communityPct = (pricing.community_share_pct || 0) / 100;
		const markupMultiplier = 1 / (1 - creatorPct - communityPct);
		const totalPrice = productionCost * markupMultiplier;
		const creatorPayout = totalPrice * creatorPct;
		const communityPayout = totalPrice * communityPct;

		return {
			provider: { id: provider.id, name: provider.name, distance_km: provider.distance_km, city: provider.location?.city || "Unknown" },
			production_cost: round2(productionCost),
			creator_payout: round2(creatorPayout),
			community_payout: round2(communityPayout),
			total_price: round2(totalPrice),
			currency: "USD",
			turnaround_days: provider.turnaround?.standard_days || 5,
			cost_breakdown: costBreakdown,
		};
	});

	options.sort((a, b) => a.total_price - b.total_price);

	return c.json({ artifact_id: artifact.id, artifact_title: artifact.payload?.title, buyer_location, quantity, options });
});

// ── Page route: shop ──
routes.get("/", (c) => {
	const space = c.req.param("space") || "demo";
	return c.html(renderShell({
		title: `Shop | rSpace`,
		moduleId: "cart",
		spaceSlug: space,
		modules: getModuleInfoList(),
		theme: "light",
		styles: `<link rel="stylesheet" href="/modules/cart/cart.css">`,
		body: `<folk-cart-shop></folk-cart-shop>`,
		scripts: `<script type="module" src="/modules/cart/folk-cart-shop.js"></script>`,
	}));
});

export const cartModule: RSpaceModule = {
	id: "cart",
	name: "rCart",
	icon: "\u{1F6D2}",
	description: "Cosmolocal print-on-demand shop",
	routes,
	standaloneDomain: "rcart.online",
};