import 'dotenv/config';
import express from 'express';
import type { Request, Response, NextFunction } from 'express';
import cors from 'cors';
import { z } from 'zod';
import { PrismaClient, v2_ConsumableTempRequestStatus, Prisma } from './generated/prisma/index.js';

// ---------- Prisma ----------
const prisma = new PrismaClient();

// ---------- App ----------
const app = express();
app.use(cors());
app.use(express.json());

// ---------- Helpers ----------
const asyncHandler = <T extends express.RequestHandler>(fn: T): T => {
	// @ts-ignore
	return (async (req: Request, res: Response, next: NextFunction) => {
		try { await fn(req, res, next); } catch (e) { next(e); }
	}) as T;
};

const paginateParamsSchema = z.object({
	page: z.coerce.number().int().positive().default(1),
	pageSize: z.coerce.number().int().positive().max(100).default(20)
});

// ---------- Zod Schemas ----------
const requestItemInputSchema = z.object({
	name: z.string().min(1),
	spec: z.string().optional(),
	quantity: z.number().int().positive(),
	unit: z.string().optional(),
	estimatedUnitCost: z.number().positive().optional(),
	remark: z.string().optional(),
	catalogId: z.string().optional()
});

const createRequestSchema = z.object({
	applicantName: z.string().optional(),
	applicantPhone: z.string().min(3),
	department: z.string().optional(),
	reason: z.string().optional(),
	neededAt: z.coerce.date().optional(),
	items: z.array(requestItemInputSchema).min(1, '必须至少包含一条物料明细')
});

const updateRequestSchema = createRequestSchema.partial().extend({
	items: z.array(requestItemInputSchema.extend({ id: z.string().optional() })).optional()
});

const updateStatusSchema = z.object({
	status: z.nativeEnum(v2_ConsumableTempRequestStatus),
	approverId: z.string().optional(),
	remark: z.string().optional()
});

const catalogCreateSchema = z.object({
	name: z.string().min(1),
	spec: z.string().optional(),
	unit: z.string().optional(),
	isActive: z.boolean().optional().default(true)
});
const catalogUpdateSchema = catalogCreateSchema.partial();

// ---------- Routes ----------
app.get('/health', (_req, res) => res.json({ ok: true, time: new Date().toISOString() }));

// Create request with items
app.post('/api/consumable-temp-requests', asyncHandler(async (req, res) => {
	const parsed = createRequestSchema.parse(req.body);
	const result = await prisma.v2_ConsumableTempRequest.create({
		data: {
			applicantName: parsed.applicantName,
			applicantPhone: parsed.applicantPhone,
			department: parsed.department,
			reason: parsed.reason,
			neededAt: parsed.neededAt,
			items: { create: parsed.items.map(i => ({
				name: i.name,
				spec: i.spec,
				quantity: i.quantity,
				unit: i.unit,
				estimatedUnitCost: i.estimatedUnitCost !== undefined ? new Prisma.Decimal(i.estimatedUnitCost) : undefined,
				remark: i.remark,
				catalogId: i.catalogId ?? null
			})) }
		},
		include: { items: true }
	});
	res.status(201).json({ data: result });
}));

// List requests with filters & pagination
app.get('/api/consumable-temp-requests', asyncHandler(async (req, res) => {
	const { page, pageSize } = paginateParamsSchema.parse({ page: req.query.page, pageSize: req.query.pageSize });
	const where: any = {};
	if (req.query.status) where.status = req.query.status;
	if (req.query.applicantPhone) where.applicantPhone = req.query.applicantPhone;
	if (req.query.from || req.query.to) {
		where.createdAt = {};
		if (req.query.from) where.createdAt.gte = new Date(String(req.query.from));
		if (req.query.to) where.createdAt.lte = new Date(String(req.query.to));
	}
	const [total, items] = await Promise.all([
		prisma.v2_ConsumableTempRequest.count({ where }),
		prisma.v2_ConsumableTempRequest.findMany({
			where,
			orderBy: { createdAt: 'desc' },
			skip: (page - 1) * pageSize,
			take: pageSize,
			include: { items: true }
		})
	]);
	res.json({ data: items, meta: { total, page, pageSize } });
}));

// Get detail
app.get('/api/consumable-temp-requests/:id', asyncHandler(async (req, res) => {
	const data = await prisma.v2_ConsumableTempRequest.findUnique({
		where: { id: req.params.id },
		include: { items: true }
	});
	if (!data) return res.status(404).json({ error: 'Not Found' });
	res.json({ data });
}));

// Full update (basic fields + replace items if provided via upsert logic)
app.put('/api/consumable-temp-requests/:id', asyncHandler(async (req, res) => {
	const parsed = updateRequestSchema.parse(req.body);
	// We will handle items manually in a transaction: update existing, create new, delete removed
	const result = await prisma.$transaction(async (tx) => {
		const existing = await tx.v2_ConsumableTempRequest.findUnique({ where: { id: req.params.id }, include: { items: true } });
		if (!existing) throw new Error('NOT_FOUND');
		// Update base
		await tx.v2_ConsumableTempRequest.update({
			where: { id: existing.id },
			data: {
				applicantName: parsed.applicantName ?? existing.applicantName,
				applicantPhone: parsed.applicantPhone ?? existing.applicantPhone,
				department: parsed.department ?? existing.department,
				reason: parsed.reason ?? existing.reason,
				neededAt: parsed.neededAt ?? existing.neededAt
			}
		});
		if (parsed.items) {
			const incoming = parsed.items;
			const incomingIds = new Set(incoming.filter(i => i.id).map(i => i.id!));
			// Delete removed
			const toDelete = existing.items.filter(i => !incomingIds.has(i.id)).map(i => i.id);
			if (toDelete.length) {
				await tx.v2_ConsumableTempRequestItem.deleteMany({ where: { id: { in: toDelete } } });
			}
			// Upsert each incoming
			for (const item of incoming) {
				if (item.id) {
					await tx.v2_ConsumableTempRequestItem.update({
						where: { id: item.id },
						data: {
							name: item.name ?? undefined,
							spec: item.spec,
							quantity: item.quantity ?? undefined,
							unit: item.unit,
							estimatedUnitCost: item.estimatedUnitCost !== undefined ? new Prisma.Decimal(item.estimatedUnitCost) : undefined,
							remark: item.remark,
							catalogId: item.catalogId
						}
					});
				} else {
					await tx.v2_ConsumableTempRequestItem.create({ data: {
						requestId: existing.id,
						name: item.name,
						spec: item.spec,
						quantity: item.quantity,
						unit: item.unit,
						estimatedUnitCost: item.estimatedUnitCost !== undefined ? new Prisma.Decimal(item.estimatedUnitCost) : undefined,
						remark: item.remark,
						catalogId: item.catalogId
					}});
				}
			}
		}
		return tx.v2_ConsumableTempRequest.findUnique({ where: { id: existing.id }, include: { items: true } });
	});
	res.json({ data: result });
}));

// Update status
app.patch('/api/consumable-temp-requests/:id/status', asyncHandler(async (req, res) => {
	const parsed = updateStatusSchema.parse(req.body);
	const data = await prisma.v2_ConsumableTempRequest.update({
		where: { id: req.params.id },
		data: {
			status: parsed.status,
			approverId: parsed.approverId,
			approvedAt: (parsed.status === v2_ConsumableTempRequestStatus.APPROVED || parsed.status === v2_ConsumableTempRequestStatus.REJECTED) ? new Date() : undefined,
			remark: parsed.remark
		},
		include: { items: true }
	}).catch(e => { if ((e as any).code === 'P2025') return null; throw e; });
	if (!data) return res.status(404).json({ error: 'Not Found' });
	res.json({ data });
}));

// Delete request (cascade deletes items)
app.delete('/api/consumable-temp-requests/:id', asyncHandler(async (req, res) => {
	await prisma.v2_ConsumableTempRequest.delete({ where: { id: req.params.id } }).catch(e => { if ((e as any).code === 'P2025') return null; throw e; });
	res.status(204).end();
}));

// Add item to request
app.post('/api/consumable-temp-requests/:id/items', asyncHandler(async (req, res) => {
	const parsed = requestItemInputSchema.parse(req.body);
	// Ensure request exists
	const exists = await prisma.v2_ConsumableTempRequest.count({ where: { id: req.params.id } });
	if (!exists) return res.status(404).json({ error: 'Request Not Found' });
	const item = await prisma.v2_ConsumableTempRequestItem.create({ data: {
		requestId: req.params.id as string,
		name: parsed.name,
		spec: parsed.spec,
		quantity: parsed.quantity,
		unit: parsed.unit,
		estimatedUnitCost: parsed.estimatedUnitCost !== undefined ? new Prisma.Decimal(parsed.estimatedUnitCost) : undefined,
		remark: parsed.remark,
		catalogId: parsed.catalogId ?? null
	}});
	res.status(201).json({ data: item });
}));

// Update single item
app.put('/api/consumable-temp-items/:itemId', asyncHandler(async (req, res) => {
	const parsed = requestItemInputSchema.partial().parse(req.body);
	const item = await prisma.v2_ConsumableTempRequestItem.update({
		where: { id: req.params.itemId },
		data: {
			name: parsed.name,
			spec: parsed.spec,
			quantity: parsed.quantity,
			unit: parsed.unit,
			estimatedUnitCost: parsed.estimatedUnitCost !== undefined ? new Prisma.Decimal(parsed.estimatedUnitCost) : undefined,
			remark: parsed.remark,
			catalogId: parsed.catalogId
		}
	}).catch(e => { if ((e as any).code === 'P2025') return null; throw e; });
	if (!item) return res.status(404).json({ error: 'Not Found' });
	res.json({ data: item });
}));

// Delete item
app.delete('/api/consumable-temp-items/:itemId', asyncHandler(async (req, res) => {
	await prisma.v2_ConsumableTempRequestItem.delete({ where: { id: req.params.itemId } }).catch(e => { if ((e as any).code === 'P2025') return null; throw e; });
	res.status(204).end();
}));

// Catalog CRUD
app.post('/api/consumable-temp-catalog', asyncHandler(async (req, res) => {
	const parsed = catalogCreateSchema.parse(req.body);
	const data = await prisma.v2_ConsumableTempCatalog.create({ data: parsed });
	res.status(201).json({ data });
}));

app.get('/api/consumable-temp-catalog', asyncHandler(async (req, res) => {
	const { page, pageSize } = paginateParamsSchema.parse({ page: req.query.page, pageSize: req.query.pageSize });
	const where: any = {};
	if (req.query.isActive !== undefined) where.isActive = req.query.isActive === 'true';
	if (req.query.q) where.name = { contains: String(req.query.q) };
	const [total, rows] = await Promise.all([
		prisma.v2_ConsumableTempCatalog.count({ where }),
		prisma.v2_ConsumableTempCatalog.findMany({ where, orderBy: { name: 'asc' }, skip: (page - 1) * pageSize, take: pageSize })
	]);
	res.json({ data: rows, meta: { total, page, pageSize } });
}));

app.get('/api/consumable-temp-catalog/:id', asyncHandler(async (req, res) => {
	const data = await prisma.v2_ConsumableTempCatalog.findUnique({ where: { id: req.params.id } });
	if (!data) return res.status(404).json({ error: 'Not Found' });
	res.json({ data });
}));

app.put('/api/consumable-temp-catalog/:id', asyncHandler(async (req, res) => {
	const parsed = catalogUpdateSchema.parse(req.body);
	const data = await prisma.v2_ConsumableTempCatalog.update({ where: { id: req.params.id }, data: parsed }).catch(e => { if ((e as any).code === 'P2025') return null; throw e; });
	if (!data) return res.status(404).json({ error: 'Not Found' });
	res.json({ data });
}));

// Deactivate instead of delete
app.delete('/api/consumable-temp-catalog/:id', asyncHandler(async (req, res) => {
	await prisma.v2_ConsumableTempCatalog.update({ where: { id: req.params.id }, data: { isActive: false } }).catch(e => { if ((e as any).code === 'P2025') return null; throw e; });
	res.status(204).end();
}));

// ---------- Error Handler ----------
// eslint-disable-next-line @typescript-eslint/no-unused-vars
app.use((err: any, _req: Request, res: Response, _next: NextFunction) => {
	if (err instanceof z.ZodError) {
		return res.status(400).json({ error: 'VALIDATION_ERROR', details: err.flatten() });
	}
	if (err.message === 'NOT_FOUND') return res.status(404).json({ error: 'Not Found' });
	console.error('Unhandled Error:', err);
	res.status(500).json({ error: 'INTERNAL_ERROR' });
});

// ---------- Start Server ----------
const PORT = Number(process.env.PORT) || 3000;
app.listen(PORT, () => {
	console.log(`Consumable Temp Request API listening on :${PORT}`);
});

// Graceful shutdown
process.on('SIGINT', async () => { await prisma.$disconnect(); process.exit(0); });
process.on('SIGTERM', async () => { await prisma.$disconnect(); process.exit(0); });