feat: Define Waste Struct

contracts/waste-management/Cargo.toml

@@ -0,0 +1,21 @@
+[package]
+name = "waste-management"
+description = "Waste tracking and recycling management contract"
+edition.workspace = true
+license.workspace = true
+repository.workspace = true
+publish = false
+version.workspace = true
+
+[package.metadata.stellar]
+cargo_inherit = true 
+
+[lib]
+crate-type = ["cdylib"]
+doctest = false
+
+[dependencies]
+soroban-sdk.workspace = true
+
+[dev-dependencies]
+soroban-sdk = { workspace = true, features = ["testutils"] }

contracts/waste-management/README.md

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+# Waste Management Smart Contract
+
+A Soroban smart contract for tracking and managing waste recycling on the Stellar blockchain.
+
+## Overview
+
+This contract provides a robust system for recording waste entries with comprehensive tracking capabilities including location data, ownership, and confirmation status.
+
+## Waste Struct
+
+The main `Waste` struct contains the following fields:
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `waste_id` | `u128` | Unique identifier for the waste entry |
+| `waste_type` | `WasteType` | Type of waste (Plastic, Glass, Metal, etc.) |
+| `weight` | `u128` | Weight of the waste in grams |
+| `current_owner` | `Address` | Current owner of the waste |
+| `latitude` | `i128` | Latitude coordinate (multiplied by 10^7 for precision) |
+| `longitude` | `i128` | Longitude coordinate (multiplied by 10^7 for precision) |
+| `recycled_timestamp` | `u64` | Timestamp when the waste was recycled |
+| `is_active` | `bool` | Whether the waste entry is active |
+| `is_confirmed` | `bool` | Whether the waste has been confirmed |
+| `confirmer` | `Address` | Address of the confirmer |
+
+## Waste Types
+
+The contract supports the following waste types:
+
+- `Plastic`
+- `Glass`
+- `Metal`
+- `Paper`
+- `Organic`
+- `Electronic`
+- `Hazardous`
+- `Mixed`
+
+## Builder Pattern
+
+The contract implements a builder pattern for convenient waste creation:
+
+```rust
+let waste = WasteBuilder::new()
+    .waste_id(1)
+    .waste_type(WasteType::Plastic)
+    .weight(1000)
+    .current_owner(owner)
+    .latitude(404850000)  // 40.4850000 * 10^7
+    .longitude(-740600000) // -74.0600000 * 10^7
+    .recycled_timestamp(timestamp)
+    .is_active(true)
+    .is_confirmed(false)
+    .confirmer(confirmer)
+    .build();
+```
+
+## Contract Methods
+
+### `create_waste`
+
+Creates a new waste entry with the specified parameters.
+
+**Parameters:**
+- `waste_id`: Unique identifier
+- `waste_type`: Type of waste
+- `weight`: Weight in grams
+- `current_owner`: Owner address (requires auth)
+- `latitude`: Latitude coordinate
+- `longitude`: Longitude coordinate
+
+**Returns:** `Waste` struct
+
+## Location Coordinates
+
+Latitude and longitude values are stored as `i128` integers multiplied by 10^7 for precision:
+- Example: 40.4850000° → 404850000
+- Example: -74.0600000° → -740600000
+
+## Building
+
+```bash
+cargo build --manifest-path contracts/waste-management/Cargo.toml --release --target wasm32-unknown-unknown
+```
+
+## Testing
+
+```bash
+cargo test --manifest-path contracts/waste-management/Cargo.toml
+```
+
+## Acceptance Criteria
+
+✅ Struct compiles and can be stored  
+✅ All fields are properly typed  
+✅ Builder pattern works correctly  
+✅ All tests pass  
+✅ Contract can be built for WASM deployment

contracts/waste-management/src/lib.rs

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+#![no_std]
+
+mod waste;
+
+pub use waste::{Waste, WasteBuilder, WasteType};
+
+use soroban_sdk::{contract, contractimpl, Address, Env};
+
+#[contract]
+pub struct WasteManagement;
+
+#[contractimpl]
+impl WasteManagement {
+    /// Create a new waste entry
+    pub fn create_waste(
+        env: Env,
+        waste_id: u128,
+        waste_type: WasteType,
+        weight: u128,
+        current_owner: Address,
+        latitude: i128,
+        longitude: i128,
+    ) -> Waste {
+        current_owner.require_auth();
+
+        let waste = WasteBuilder::new()
+            .waste_id(waste_id)
+            .waste_type(waste_type)
+            .weight(weight)
+            .current_owner(current_owner.clone())
+            .latitude(latitude)
+            .longitude(longitude)
+            .recycled_timestamp(env.ledger().timestamp())
+            .is_active(true)
+            .is_confirmed(false)
+            .confirmer(current_owner)
+            .build();
+
+        waste
+    }
+}
+
+#[cfg(test)]
+mod test;

contracts/waste-management/src/test.rs

@@ -0,0 +1,169 @@
+#![cfg(test)]
+extern crate std;
+
+use crate::{Waste, WasteBuilder, WasteManagement, WasteManagementClient, WasteType};
+use soroban_sdk::{testutils::Address as _, Address, Env};
+use std::vec;
+
+#[test]
+fn test_waste_struct_creation() {
+    let env = Env::default();
+    let owner = Address::generate(&env);
+    let confirmer = Address::generate(&env);
+
+    let waste = Waste {
+        waste_id: 1,
+        waste_type: WasteType::Plastic,
+        weight: 1000,
+        current_owner: owner.clone(),
+        latitude: 404850000, // 40.4850000 * 10^7
+        longitude: -740600000, // -74.0600000 * 10^7
+        recycled_timestamp: 1234567890,
+        is_active: true,
+        is_confirmed: false,
+        confirmer: confirmer.clone(),
+    };
+
+    assert_eq!(waste.waste_id, 1);
+    assert_eq!(waste.waste_type, WasteType::Plastic);
+    assert_eq!(waste.weight, 1000);
+    assert_eq!(waste.current_owner, owner);
+    assert_eq!(waste.latitude, 404850000);
+    assert_eq!(waste.longitude, -740600000);
+    assert_eq!(waste.recycled_timestamp, 1234567890);
+    assert_eq!(waste.is_active, true);
+    assert_eq!(waste.is_confirmed, false);
+    assert_eq!(waste.confirmer, confirmer);
+}
+
+#[test]
+fn test_waste_builder_pattern() {
+    let env = Env::default();
+    let owner = Address::generate(&env);
+    let confirmer = Address::generate(&env);
+
+    let waste = WasteBuilder::new()
+        .waste_id(42)
+        .waste_type(WasteType::Glass)
+        .weight(2500)
+        .current_owner(owner.clone())
+        .latitude(337700000) // 33.7700000 * 10^7
+        .longitude(-842800000) // -84.2800000 * 10^7
+        .recycled_timestamp(9876543210)
+        .is_active(true)
+        .is_confirmed(true)
+        .confirmer(confirmer.clone())
+        .build();
+
+    assert_eq!(waste.waste_id, 42);
+    assert_eq!(waste.waste_type, WasteType::Glass);
+    assert_eq!(waste.weight, 2500);
+    assert_eq!(waste.current_owner, owner);
+    assert_eq!(waste.latitude, 337700000);
+    assert_eq!(waste.longitude, -842800000);
+    assert_eq!(waste.recycled_timestamp, 9876543210);
+    assert_eq!(waste.is_active, true);
+    assert_eq!(waste.is_confirmed, true);
+    assert_eq!(waste.confirmer, confirmer);
+}
+
+#[test]
+fn test_all_waste_types() {
+    let env = Env::default();
+    let owner = Address::generate(&env);
+
+    let waste_types = vec![
+        WasteType::Plastic,
+        WasteType::Glass,
+        WasteType::Metal,
+        WasteType::Paper,
+        WasteType::Organic,
+        WasteType::Electronic,
+        WasteType::Hazardous,
+        WasteType::Mixed,
+    ];
+
+    for (i, waste_type) in waste_types.iter().enumerate() {
+        let waste = WasteBuilder::new()
+            .waste_id(i as u128)
+            .waste_type(waste_type.clone())
+            .weight(1000)
+            .current_owner(owner.clone())
+            .latitude(0)
+            .longitude(0)
+            .recycled_timestamp(0)
+            .is_active(true)
+            .is_confirmed(false)
+            .confirmer(owner.clone())
+            .build();
+
+        assert_eq!(waste.waste_type, *waste_type);
+    }
+}
+
+#[test]
+fn test_contract_create_waste() {
+    let env = Env::default();
+    env.mock_all_auths();
+
+    let contract_id = env.register(WasteManagement, ());
+    let client = WasteManagementClient::new(&env, &contract_id);
+
+    let owner = Address::generate(&env);
+
+    let waste = client.create_waste(
+        &123,
+        &WasteType::Metal,
+        &5000,
+        &owner,
+        &515000000, // 51.5000000 * 10^7 (London)
+        &-1270000, // -0.1270000 * 10^7
+    );
+
+    assert_eq!(waste.waste_id, 123);
+    assert_eq!(waste.waste_type, WasteType::Metal);
+    assert_eq!(waste.weight, 5000);
+    assert_eq!(waste.current_owner, owner);
+    assert_eq!(waste.latitude, 515000000);
+    assert_eq!(waste.longitude, -1270000);
+    assert_eq!(waste.is_active, true);
+    assert_eq!(waste.is_confirmed, false);
+}
+
+#[test]
+#[should_panic(expected = "waste_id is required")]
+fn test_builder_missing_waste_id() {
+    let env = Env::default();
+    let owner = Address::generate(&env);
+
+    WasteBuilder::new()
+        .waste_type(WasteType::Plastic)
+        .weight(1000)
+        .current_owner(owner.clone())
+        .latitude(0)
+        .longitude(0)
+        .recycled_timestamp(0)
+        .is_active(true)
+        .is_confirmed(false)
+        .confirmer(owner)
+        .build();
+}
+
+#[test]
+#[should_panic(expected = "waste_type is required")]
+fn test_builder_missing_waste_type() {
+    let env = Env::default();
+    let owner = Address::generate(&env);
+
+    WasteBuilder::new()
+        .waste_id(1)
+        .weight(1000)
+        .current_owner(owner.clone())
+        .latitude(0)
+        .longitude(0)
+        .recycled_timestamp(0)
+        .is_active(true)
+        .is_confirmed(false)
+        .confirmer(owner)
+        .build();
+}