import * as db from '../../db/stock.js';
import { emit } from '../sse.js';

// #region Helpers

function requireSelectedCompany(req) {
    const companyId = req.user?.selectedCompanyId;
    if (companyId == null) {
        return { error: 'No company selected' };
    }
    return { companyId };
}

function stockErrorStatus(error) {
    if (error.message === 'No company selected') return 400;
    if (error.message === 'Not authorized') return 403;
    if (error.message?.includes('not found')) return 404;
    if (
        error.message?.includes('already accepted') ||
        error.message?.includes('already shipped') ||
        error.message?.includes('already booked') ||
        error.message?.includes('Stock tracking is disabled') ||
        error.message?.startsWith('Insufficient stock')
    ) {
        return 409;
    }
    if (
        error.message?.includes('required') ||
        error.message?.includes('Invalid') ||
        error.message?.includes('Amount must be') ||
        error.message?.includes('Warehouse must be') ||
        error.message?.includes('No items') ||
        error.message?.includes('does not belong to') ||
        error.message?.includes('cannot have stock') ||
        error.message?.includes('parent article') ||
        error.message?.includes('Stückliste') ||
        error.message?.includes('has no SKU')
    ) {
        return 400;
    }
    return 500;
}

function emitStockEvents(companyId, body, result) {
    emit('stock', { companyId });
    emit('ledger', { companyId });
    emit('articles', { companyId });

    if (body.sku) {
        emit(`article-${body.sku}`, { companyId });
    }
    if (Array.isArray(body.lines)) {
        for (const line of body.lines) {
            if (line?.sku) {
                emit(`article-${line.sku}`, { companyId });
            }
        }
    }
    if (Array.isArray(result?.lines)) {
        for (const line of result.lines) {
            if (line?.sku) {
                emit(`article-${line.sku}`, { companyId });
            }
        }
    }
}

// #endregion

/**
 * Registers stock adjustment routes for the authenticated user's selected company.
 * All operations append to the append-only ledger under an implicit "adjustment" manifest.
 *
 * @param {import('express').Application} app
 * @param {string} [basePath='']
 */
export function register(app, basePath = '') {

    /**
     * @openapi
     * /stock/adjust:
     *   post:
     *     tags: [Stock]
     *     summary: Adjust stock manually
     *     description: |
     *       Writes signed (+ or -) entries to the append-only ledger under an implicit manifest
     *       of type "adjustment", allocating a number from the "adjustment" number scheme.
     *
     *       **Note:** `sku` must be a string (e.g. `"25"`), not a number. For single-item adjustments, provide `sku` and `amount` at top-level. For batch adjustments, provide `lines: [{ sku, amount, ... }]`.
     *     security:
     *       - cookieAuth: []
     *     x-signals: [stock, ledger, articles, article-<sku>]
     *     x-markdown: stock/adjust.md
     *     requestBody:
     *       required: true
     *       content:
     *         application/json:
     *           schema:
     *             $ref: '#/components/schemas/StockAdjustmentInput'
     *     responses:
     *       201:
     *         description: Stock adjusted successfully
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/StockAdjustmentResult'
     *       400:
     *         description: Missing fields, invalid amount, parent article cannot have stock, or no company selected
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       401:
     *         description: Unauthorized
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       403:
     *         description: Not authorized
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       404:
     *         description: Article or warehouse not found
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       409:
     *         description: Stock tracking is disabled
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     */
    // #region POST /stock/adjust

    app.post(`${basePath}/stock/adjust`, async (req, res) => {
        const selected = requireSelectedCompany(req);
        if (selected.error) {
            return res.status(400).json({ error: selected.error });
        }

        try {
            const result = await db.adjust(req.user.id, req.body ?? {});
            emitStockEvents(selected.companyId, req.body ?? {}, result);
            res.status(201).json(result);
        } catch (error) {
            const status = stockErrorStatus(error);
            if (status === 500) console.error('Stock adjust failed:', error);
            res.status(status).json({ error: error.message });
        }
    });

    // #endregion

    /**
     * @openapi
     * /stock/accept:
     *   post:
     *     tags: [Stock]
     *     summary: Accept delivery manifest item(s)
     *     description: |
     *       Books acceptance for a delivery manifest item on the ledger (warehouse_id = null).
     *       If the connected article has stock tracking enabled, an adjustment entry is also
     *       booked to adjust physical stock in the target warehouse.
     *       If line amount is negative, books as a delivery return (outgoing).
     *     security:
     *       - cookieAuth: []
     *     x-signals: [stock, ledger, articles, delivery]
     *     requestBody:
     *       required: true
     *       content:
     *         application/json:
     *           schema:
     *             type: object
     *             properties:
     *               manifestarticleId:
     *                 type: integer
     *                 description: Manifest article ID of the delivery line
     *               warehouseId:
     *                 type: integer
     *                 description: Optional warehouse ID for inventory intake
     *               items:
     *                 type: array
     *                 items:
     *                   type: object
     *                   required: [manifestarticleId]
     *                   properties:
     *                     manifestarticleId:
     *                       type: integer
     *                     warehouseId:
     *                       type: integer
     *     responses:
     *       200:
     *         description: Delivery item(s) accepted successfully
     *       400:
     *         description: Validation error or no company selected
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       401:
     *         description: Unauthorized
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       403:
     *         description: Not authorized
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       404:
     *         description: Manifest article or warehouse not found
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       409:
     *         description: Delivery line already accepted on ledger or stock tracking disabled
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     */
    // #region POST /stock/accept

    app.post(`${basePath}/stock/accept`, async (req, res) => {
        const selected = requireSelectedCompany(req);
        if (selected.error) {
            return res.status(400).json({ error: selected.error });
        }

        try {
            const result = await db.accept(req.user.id, req.body ?? {});
            emit('stock', { companyId: selected.companyId });
            emit('ledger', { companyId: selected.companyId });
            emit('articles', { companyId: selected.companyId });
            emit('delivery', { companyId: selected.companyId });
            res.status(200).json(result);
        } catch (error) {
            const status = stockErrorStatus(error);
            if (status === 500) console.error('Stock accept failed:', error);
            res.status(status).json({ error: error.message });
        }
    });

    // #endregion

    /**
     * @openapi
     * /stock/ship:
     *   post:
     *     tags: [Stock]
     *     summary: Ship shipment manifest item(s)
     *     description: |
     *       Books shipment for a shipment manifest item on the ledger (warehouse_id = null).
     *       If the connected article has stock tracking enabled, an adjustment entry is also
     *       booked to deduct physical stock from the target warehouse.
     *     security:
     *       - cookieAuth: []
     *     x-signals: [stock, ledger, articles, shipping]
     *     requestBody:
     *       required: true
     *       content:
     *         application/json:
     *           schema:
     *             type: object
     *             properties:
     *               manifestarticleId:
     *                 type: integer
     *                 description: Manifest article ID of the shipment line
     *               warehouseId:
     *                 type: integer
     *                 description: Optional warehouse ID for inventory deduction
     *               items:
     *                 type: array
     *                 items:
     *                   type: object
     *                   required: [manifestarticleId]
     *                   properties:
     *                     manifestarticleId:
     *                       type: integer
     *                     warehouseId:
     *                       type: integer
     *     responses:
     *       200:
     *         description: Shipment item(s) shipped successfully
     *       400:
     *         description: Validation error or no company selected
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       401:
     *         description: Unauthorized
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       403:
     *         description: Not authorized
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       404:
     *         description: Manifest article or warehouse not found
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       409:
     *         description: Shipment line already shipped on ledger or stock tracking disabled
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     */
    // #region POST /stock/ship

    app.post(`${basePath}/stock/ship`, async (req, res) => {
        const selected = requireSelectedCompany(req);
        if (selected.error) {
            return res.status(400).json({ error: selected.error });
        }

        try {
            const result = await db.ship(req.user.id, req.body ?? {});
            emit('stock', { companyId: selected.companyId });
            emit('ledger', { companyId: selected.companyId });
            emit('articles', { companyId: selected.companyId });
            emit('shipping', { companyId: selected.companyId });
            res.status(200).json(result);
        } catch (error) {
            const status = stockErrorStatus(error);
            if (status === 500) console.error('Stock ship failed:', error);
            res.status(status).json({ error: error.message });
        }
    });

    // #endregion
}