# Phase 4, Milestone 1: Contract Development Kit

> SDK and tooling for smart contract development

**Status**: ✅ Complete
**Priority**: Medium
**Crates**: `synor-sdk`, `contracts/*`

---

## Overview

Create a comprehensive development kit for building smart contracts on Synor, including SDK, templates, and example contracts.

---

## Tasks

### Task 1.1: Contract Template
- [x] Create boilerplate project structure
- [x] Cargo.toml template with WASM target
- [x] Basic contract skeleton
- [x] README with instructions
- [x] Generator script

**Files:**
- `contracts/template/`
- `scripts/new-contract.sh`

**Template Structure:**
```
contracts/template/
├── Cargo.toml
├── src/
│   └── lib.rs
├── tests/
│   └── integration.rs
└── README.md
```

### Task 1.2: Host Function Documentation
- [x] Document all host functions
- [x] Parameter types and return values
- [x] Gas costs per function
- [x] Usage examples
- [x] Security considerations

**Files:**
- `contracts/HOST_FUNCTIONS.md`

**Host Functions:**
| Function | Description | Gas |
|----------|-------------|-----|
| `env::caller()` | Get caller address | 100 |
| `env::block_height()` | Current height | 50 |
| `env::timestamp()` | Block timestamp | 50 |
| `env::value()` | SYNOR sent | 50 |
| `storage::get(key)` | Read storage | 500 |
| `storage::set(key, value)` | Write storage | 5000 |
| `storage::delete(key)` | Delete storage | 500 |
| `env::emit_event(name, data)` | Emit event | 1000 |
| `crypto::hash(data)` | Blake3 hash | 200 |
| `crypto::verify(pk, msg, sig)` | Verify signature | 3000 |

### Task 1.3: Rust SDK
- [x] Procedural macros for contracts
- [x] Storage abstractions
- [x] Event emission helpers
- [x] Crypto utilities
- [x] ABI generation

**Files:**
- `crates/synor-sdk/`

**SDK Features:**
```rust
#[synor_contract]
mod my_contract {
    #[init]
    pub fn init() { ... }

    #[call]
    pub fn transfer(to: Address, amount: u64) { ... }

    #[view]
    pub fn balance_of(addr: Address) -> u64 { ... }
}
```

### Task 1.4: Example Contracts
- [x] Fungible token (ERC-20 style)
- [x] Non-fungible token (ERC-721 style)
- [x] Decentralized exchange (AMM)
- [x] Staking contract

**Files:**
- `contracts/token/` - Fungible token
- `contracts/nft/` - NFT contract
- `contracts/dex/` - AMM exchange
- `contracts/staking/` - Staking rewards

---

## Validation

### Validation Commands

```bash
# Build all contracts
for dir in contracts/*/; do
  (cd "$dir" && cargo build --target wasm32-unknown-unknown --release)
done

# Run contract tests
for dir in contracts/*/; do
  (cd "$dir" && cargo test)
done

# Verify WASM output
wasm-objdump -h contracts/token/target/wasm32-unknown-unknown/release/token.wasm
```

### Validation Agents

| Agent | Purpose |
|-------|---------|
| `code-reviewer` | Review SDK and contracts |
| `type-design-analyzer` | Validate SDK types |

### Contract Test Matrix

| Contract | Unit Tests | Integration Tests | Gas Tests |
|----------|------------|-------------------|-----------|
| Token | 15 | 5 | 3 |
| NFT | 12 | 4 | 2 |
| DEX | 20 | 8 | 5 |
| Staking | 18 | 6 | 4 |

### Security Checks

- [ ] Re-entrancy protection in SDK
- [ ] Integer overflow checks
- [ ] Access control patterns
- [ ] Storage key collision prevention
- [ ] Gas limit enforcement

### Contract Verification

```rust
// Token contract tests
#[test]
fn test_transfer() {
    let mut env = TestEnv::new();
    let alice = env.create_account(1000);
    let bob = env.create_account(0);
    let contract = env.deploy("token", &alice, &[1000u64]);

    env.call(&contract, &alice, "transfer", &[&bob, &100u64]);

    assert_eq!(env.view::<u64>(&contract, "balance_of", &[&alice]), 900);
    assert_eq!(env.view::<u64>(&contract, "balance_of", &[&bob]), 100);
}
```

---

## Acceptance Criteria

1. SDK compiles and tests pass
2. All example contracts deploy successfully
3. Host functions documented
4. Template script generates valid projects
5. Gas costs are reasonable

---

*Completed: January 2025*