import {
	CustomerNotFoundError,
	ErrCode,
	InternalError,
	RecaseError,
	RewardCategory,
	type RewardRedemption,
	RewardTriggerEvent,
} from "@autumn/shared";
import { z } from "zod/v4";
import { parseCtxForAction } from "@/internal/analytics/actionUtils.js";
import { CusService } from "@/internal/customers/CusService.js";
import { RewardProgramService } from "@/internal/rewards/RewardProgramService.js";
import { RewardRedemptionService } from "@/internal/rewards/RewardRedemptionService.js";
import { RewardService } from "@/internal/rewards/RewardService.js";
import { triggerFreeProduct } from "@/internal/rewards/referralUtils/triggerFreeProduct.js";
import { triggerRedemption } from "@/internal/rewards/referralUtils.js";
import { getRewardCat } from "@/internal/rewards/rewardUtils.js";
import { generateId, notNullish } from "@/utils/genUtils.js";
import type { ExtendedRequest } from "@/utils/models/Request.js";
import { createRoute } from "../../../../../honoMiddlewares/routeHandler";

export const handleRedeemReferral = createRoute({
	body: z.object({
		code: z.string(),
		customer_id: z.string(),
	}),
	handler: async (c) => {
		const ctx = c.get("ctx");
		const { db, org, env } = ctx;
		const { code, customer_id: customerId } = c.req.valid("json");

		// 1. Get redeemed by customer, and referral code
		const [customer, referralCode] = await Promise.all([
			CusService.get({
				db,
				orgId: org.id,
				env,
				idOrInternalId: customerId,
			}),
			RewardProgramService.getReferralCode({
				db,
				orgId: org.id,
				env,
				code,
				withRewardProgram: true,
			}),
		]);

		if (!customer) throw new CustomerNotFoundError({ customerId });

		// 2. Check that code has not reached max redemptions
		const redemptionCount = await RewardProgramService.getCodeRedemptionCount({
			db,
			referralCodeId: referralCode.id,
		});

		if (
			referralCode.reward_program.max_redemptions &&
			redemptionCount >= referralCode.reward_program.max_redemptions
		) {
			throw new RecaseError({
				message: "Referral code has reached max redemptions",
				statusCode: 400,
				code: ErrCode.ReferralCodeMaxRedemptionsReached,
			});
		}

		// 3. Check that customer has not already redeemed a code in this referral program
		const existingRedemptions = await RewardRedemptionService.getByCustomer({
			db,
			internalCustomerId: customer.internal_id,
			internalRewardProgramId: referralCode.internal_reward_program_id,
		});

		if (existingRedemptions.length > 0) {
			throw new RecaseError({
				message: `Customer ${customer.id} has already redeemed a code in this referral program`,
				statusCode: 400,
				code: ErrCode.CustomerAlreadyRedeemedReferralCode,
			});
		}

		// Don't let customer redeem their own code
		const codeCustomer = await CusService.getByInternalId({
			db,
			internalId: referralCode.internal_customer_id,
		});

		if (!codeCustomer) {
			throw new InternalError({
				message: `Referral code customer not found, internal ID: ${referralCode.internal_customer_id}`,
			});
		}

		if (
			codeCustomer.id === customer.id ||
			(notNullish(codeCustomer.fingerprint) &&
				codeCustomer.fingerprint === customer.fingerprint)
		) {
			throw new RecaseError({
				message: "Customer cannot redeem their own code",
				statusCode: 400,
				code: ErrCode.CustomerCannotRedeemOwnCode,
			});
		}

		// 4. Insert redemption into db
		let redemption: RewardRedemption = {
			id: generateId("rr"),
			referral_code_id: referralCode.id,
			internal_customer_id: customer.internal_id, // redeemed by customer
			internal_reward_program_id: referralCode.internal_reward_program_id,
			created_at: Date.now(),
			triggered:
				referralCode.reward_program.when ===
				RewardTriggerEvent.CustomerCreation,
			applied: false,
			updated_at: Date.now(),
			redeemer_applied: false,
		};

		redemption = await RewardRedemptionService.insert({
			db,
			rewardRedemption: redemption,
		});

		// 5. If reward trigger when is immediate:
		const { reward_program } = referralCode;
		const redeemRewardNow =
			referralCode.reward_program.when === RewardTriggerEvent.CustomerCreation;

		if (redeemRewardNow) {
			const reward = await RewardService.get({
				db,
				orgId: org.id,
				env,
				idOrInternalId: reward_program.internal_reward_id,
			});

			if (!reward) {
				throw new RecaseError({
					message: `Reward ${reward_program.internal_reward_id} not found`,
					statusCode: 404,
					code: ErrCode.RewardNotFound,
				});
			}

			const rewardCat = getRewardCat(reward);
			if (rewardCat === RewardCategory.FreeProduct) {
				await triggerFreeProduct({
					req: parseCtxForAction({ ctx }) as ExtendedRequest,
					db,
					referralCode,
					redeemer: customer,
					rewardProgram: reward_program,
					org,
					env,
					logger: ctx.logger,
					redemption,
				});
			} else {
				await triggerRedemption({
					db,
					referralCode,
					org,
					env,
					logger: ctx.logger,
					reward,
					redemption,
				});
			}
		}

		return c.json({
			id: redemption.id,
			customer_id: customer.id,
			reward_id: reward_program.reward.id,
			referrer: {
				id: codeCustomer.id,
				name: codeCustomer.name,
				email: codeCustomer.email,
				created_at: codeCustomer.created_at,
			},
			redeemer: {
				id: customer.id,
				name: customer.name,
				email: customer.email,
				created_at: customer.created_at,
			},
		});
	},
});

// export default async (req: any, res: any) =>
// 	routeHandler({
// 		req,
// 		res,
// 		action: "redeem referral code",
// 		handler: async (req, res) => {
// 			const { orgId, env, logger, db } = req;
// 			const { code, customer_id: customerId } = req.body;

// 			// 1. Get redeemed by customer, and referral code
// 			const [customer, referralCode, org] = await Promise.all([
// 				CusService.get({
// 					db,
// 					orgId,
// 					env,
// 					idOrInternalId: customerId,
// 				}),
// 				RewardProgramService.getReferralCode({
// 					db,
// 					orgId,
// 					env,
// 					code,
// 					withRewardProgram: true,
// 				}),
// 				OrgService.getFromReq(req),
// 			]);

// 			if (!customer) {
// 				throw new RecaseError({
// 					message: "Customer not found",
// 					statusCode: 404,
// 					code: ErrCode.CustomerNotFound,
// 				});
// 			}

// 			// 2. Check that code has not reached max redemptions
// 			const redemptionCount = await RewardProgramService.getCodeRedemptionCount(
// 				{
// 					db,
// 					referralCodeId: referralCode.id,
// 				},
// 			);

// 			if (
// 				referralCode.reward_program.max_redemptions &&
// 				redemptionCount >= referralCode.reward_program.max_redemptions
// 			) {
// 				throw new RecaseError({
// 					message: "Referral code has reached max redemptions",
// 					statusCode: 400,
// 					code: ErrCode.ReferralCodeMaxRedemptionsReached,
// 				});
// 			}

// 			// 3. Check that customer has not already redeemed a code in this referral program
// 			const existingRedemptions = await RewardRedemptionService.getByCustomer({
// 				db,
// 				internalCustomerId: customer.internal_id,
// 				internalRewardProgramId: referralCode.internal_reward_program_id,
// 			});

// 			if (existingRedemptions.length > 0) {
// 				throw new RecaseError({
// 					message: `Customer ${customer.id} has already redeemed a code in this referral program`,
// 					statusCode: 400,
// 					code: ErrCode.CustomerAlreadyRedeemedReferralCode,
// 				});
// 			}

// 			// Don't let customer redeem their own code
// 			const codeCustomer = await CusService.getByInternalId({
// 				db: req.db,
// 				internalId: referralCode.internal_customer_id,
// 			});

// 			if (!codeCustomer) {
// 				throw new RecaseError({
// 					message: "Referral code customer not found",
// 					statusCode: 404,
// 					code: ErrCode.CustomerNotFound,
// 				});
// 			}

// 			if (
// 				codeCustomer.id === customer.id ||
// 				(notNullish(codeCustomer.fingerprint) &&
// 					codeCustomer.fingerprint === customer.fingerprint)
// 			) {
// 				throw new RecaseError({
// 					message: "Customer cannot redeem their own code",
// 					statusCode: 400,
// 					code: ErrCode.CustomerCannotRedeemOwnCode,
// 				});
// 			}

// 			// 4. Insert redemption into db
// 			let redemption: RewardRedemption = {
// 				id: generateId("rr"),
// 				referral_code_id: referralCode.id,
// 				internal_customer_id: customer.internal_id, // redeemed by customer
// 				internal_reward_program_id: referralCode.internal_reward_program_id,
// 				created_at: Date.now(),
// 				triggered:
// 					referralCode.reward_program.when ===
// 					RewardTriggerEvent.CustomerCreation,
// 				applied: false,
// 				updated_at: Date.now(),
// 				redeemer_applied: false,
// 			};

// 			redemption = await RewardRedemptionService.insert({
// 				db,
// 				rewardRedemption: redemption,
// 			});

// 			// 5. If reward trigger when is immediate:
// 			const { reward_program } = referralCode;
// 			const redeemRewardNow =
// 				referralCode.reward_program.when ===
// 				RewardTriggerEvent.CustomerCreation;

// 			if (redeemRewardNow) {
// 				const reward = await RewardService.get({
// 					db,
// 					orgId,
// 					env,
// 					idOrInternalId: reward_program.internal_reward_id,
// 				});

// 				if (!reward) {
// 					throw new RecaseError({
// 						message: `Reward ${reward_program.internal_reward_id} not found`,
// 						statusCode: 404,
// 						code: ErrCode.RewardNotFound,
// 					});
// 				}

// 				const rewardCat = getRewardCat(reward);
// 				if (rewardCat === RewardCategory.FreeProduct) {
// 					await triggerFreeProduct({
// 						req: parseReqForAction(req) as ExtendedRequest,
// 						db,
// 						referralCode,
// 						redeemer: customer,
// 						rewardProgram: reward_program,
// 						org,
// 						env,
// 						logger,
// 						redemption,
// 					});
// 				} else {
// 					await triggerRedemption({
// 						db,
// 						referralCode,
// 						org,
// 						env,
// 						logger,
// 						reward,
// 						redemption,
// 					});
// 				}
// 			}

// 			return res.status(200).json({
// 				id: redemption.id,
// 				customer_id: customer.id,
// 				reward_id: reward_program.reward.id,
// 				referrer: {
// 					id: codeCustomer.id,
// 					name: codeCustomer.name,
// 					email: codeCustomer.email,
// 					created_at: codeCustomer.created_at,
// 				},
// 				redeemer: {
// 					id: customer.id,
// 					name: customer.name,
// 					email: customer.email,
// 					created_at: customer.created_at,
// 				},
// 			});
// 		},
// 	});