# AEVS CLI Tool — Sprint 1 Specification

## Overview

CLI tool for syncing `.env` variables between machines and team members.

- **Language:** Go (golang)
- **Architecture:** CLI communicates with a REST API server
- **Sprint scope:** CLI implementation with mock server interface

---

## Commands

### `aevs init`

Initializes or updates project configuration.

```bash
aevs init
```

**Behavior (new config):**
1. Interactive prompt for `api_url`
2. Interactive prompt for `api_key`
3. Runs `parseLocals` to scan for env files
4. Creates `aevs.yaml` config with found environments
5. `project` field left empty (will be set on first sync)

**Behavior (config exists):**
1. Runs `parseLocals` to scan for new env files
2. Merges newly found files into existing config
3. Displays list of added files

---

### `aevs project`

Project management commands.

#### List projects
```bash
aevs project -l, --list
```

**Output:**
```
uuid                                 | name
11111111-1111-1111-1111-0123456789ab | my-project
22222222-2222-2222-2222-0123456789ab | another-project
```

#### Update project name
```bash
aevs project save -n, --name "new_name"
```

**Optional flags:**
- `-c, --config <path>` — config path to read `project_id`
- `-i, --id <uuid>` — project ID directly (without config)

#### Delete project
```bash
aevs project remove -r, --id <uuid>
```

**Behavior:**
1. Fetches project name from server
2. Prompts user to confirm:
   ```
   To delete project "my-project", type the name exactly: my-project
   > _
   ```
3. If input matches → removes project and all versions from server
4. If input doesn't match → abort with error

#### Read project versions
```bash
aevs project read --id <uuid>
aevs project read --name <name>
```

**Output:**
```
timestamp           | version_name | creator | branch      | state
1706000000000000000 | v1.0         | root    | main        | active
  - ./envs/.env.prod
  - ./envs/.env.dev
1705900000000000000 | initial      | root    | feature/xyz | inactive
  - ./envs/.env.prod
```

---

### `aevs sync`

Synchronizes local environment files with server.

```bash
aevs sync [-c, --config <path>]
```

**Flags:**
- `-c, --config <path>` — path to config (default: `./aevs.yaml`)

**Flow:**
1. Parse config via `parseConfig`
2. If `project` is empty:
   - Generate UUID on client (`uuid.New()`)
   - Prompt for project name
   - Create project on server via `POST /projects` with generated ID
   - Save `project` ID to config
3. Read local env files (paths from config only, no scanning)
4. Request version data from server:
   - If config version is inactive → server returns latest **active** version
5. Build diff map between local and remote
6. Interactive conflict resolution:
   ```
   ENVIRONMENT: .env.prod
   VARIABLE: DATABASE_URL
   [1] local:  postgres://localhost:5432/dev
   [2] remote: postgres://prod.db:5432/prod
   Select (1/2):
   ```
7. New variables from remote are added without prompts
8. **Always create new version** (never update existing)
9. Prompt for new version name
10. Update local files and push new version to server
11. Update `version` in config

**Edge case — no changes:**
- If local = remote → message: "Already up to date" (no new version created)

**Edge case — no active version exists:**
- If local files exist → create new version (prompt for name)
- If no local files → error: "No active versions and no local env files found"

---

### `aevs merge`

Merges multiple versions into one.

```bash
aevs merge -v, --version "ts1 ts2 ts3" [-n, --name "merged"] [-c, --config <path>] [-p, --project <uuid>]
```

**Flags:**
- `-v, --version <timestamps>` — **required**, space-separated list of version timestamps
- `-n, --name <name>` — new version name (default: current timestamp)
- `-c, --config <path>` — config path to read `project_id`
- `-p, --project <uuid>` — project ID directly

**Note:** At least one of `-c` or `-p` must be provided.

**Flow:**
1. Fetch all specified versions from server
2. Interactive conflict resolution (same UX as sync)
3. Prompt for branch name (default: current git branch via `git symbolic-ref --short HEAD`)
4. Create new active version
5. Mark all source versions as `inactive`

---

## Functions

### `parseConfig`

Reads `aevs.yaml` configuration file.

**Input:** File path (or `DEFAULT_CONFIG`)

**Returns:**
- `project_id` — uuid.UUID (empty for new projects, set on first sync)
- `version_id` — int64 (unix nanoseconds)
- `api_key` — string
- `api_url` — string (server base URL)
- `environments` — []string (list of file paths)

### `parseLocals`

Scans directory tree for env files. **Only used during `aevs init`.**

**Patterns (include):**
- `.env` — exact match
- `*.env.*` — e.g., `.env.prod`, `config.env.local`
- `.env.example`, `.env.sample` — included (not ignored)

**Patterns (ignore directories):**
- `node_modules/`
- `.git/`
- `vendor/`

**Returns:** `map[string]map[string]string`
- Key: relative file path (e.g., `./docker/.env.prod`)
- Value: parsed KEY=VALUE pairs

**Note:** After config exists, only paths listed in config are used. Re-running `init` merges new files.

---

## Configuration

**File:** `aevs.yaml` (or path specified via `-c, --config`)

```yaml
api_url: "https://api.aevs.io"
api_key: "your-api-key-here"
project: "11111111-1111-1111-1111-0123456789ab"  # empty until first sync
version: 1706000000000000000  # unix nanoseconds
environments:
  - "./envs/.env.prod"
  - "./envs/.env.dev"
  - "./.env.local"
```

**Rules:**
- Single config file per project (no inheritance)
- Path is either explicit (`-c` flag) or current directory
- `project` may be empty initially (created on first sync)

---

## Types

```go
package types

import "github.com/google/uuid"

type Project struct {
    ID   uuid.UUID `json:"id"`
    Name string    `json:"name"`
}

type State int

const (
    Active   State = 1
    Inactive State = -1
)

type Version struct {
    Ts      int64  `json:"ts"`      // unix nanoseconds (time.Now().UnixNano())
    Name    string `json:"name"`
    Creator string `json:"creator"` // TODO: from api_key user, hardcode "root" for now
    Branch  string `json:"branch"`
    State   State  `json:"state"`
    Envs    []Env  `json:"envs"`
}

type Env struct {
    Path string            `json:"path"` // relative file path = identifier (e.g., "./.env.prod")
    Vars map[string]string `json:"vars"` // KEY=VALUE pairs (all strings, as in .env files)
}
```

**Note on Env.Vars:** All values are stored as strings because `.env` files only support string values. Type interpretation (number, bool, JSON) is handled by the application reading the env file.

---

## Server API Interface

**Base URL:** Configurable via `api_url` in config

**Authentication:** `Authorization: Bearer {api_key}`

**Content-Type:** `application/json`

### Endpoints

| Method | Path | Description | Request | Response |
|--------|------|-------------|---------|----------|
| GET | `/projects` | List projects (only accessible to api_key) | — | `[]Project` |
| POST | `/projects` | Create project | `{id, name}` | `Project` |
| PATCH | `/projects/{id}` | Update project name | `{name}` | `Project` |
| DELETE | `/projects/{id}` | Delete project | — | `204` |
| GET | `/projects/{id}/versions` | List versions | — | `[]Version` |
| POST | `/projects/{id}/versions` | Create version | `Version` | `Version` |
| GET | `/projects/{id}/versions/{ts}` | Get version with envs | — | `Version` |
| PATCH | `/projects/{id}/versions/{ts}` | Update version state | `{state}` | `Version` |

### Error Response Format

```json
{
  "error": "Human-readable error message",
  "code": "ERROR_CODE"
}
```

**Error codes:**
- `PROJECT_NOT_FOUND`
- `PROJECT_ALREADY_EXISTS` — when POST /projects with existing ID
- `VERSION_NOT_FOUND`
- `UNAUTHORIZED`
- `VALIDATION_ERROR`
- `INTERNAL_ERROR`

### Mock Server

For development and testing, implement mock server that:
- Stores data in memory
- Implements all endpoints above
- Validates api_key (hardcoded keys for MVP)
- **Authorization isolation:** Pre-populate with test data for different api_keys to verify users can't see other users' projects

**Test setup:**
```go
// Mock data for testing authorization
mockData := map[string][]Project{
    "api-key-user-1": {
        {ID: uuid.MustParse("..."), Name: "user1-project"},
    },
    "api-key-user-2": {
        {ID: uuid.MustParse("..."), Name: "user2-project"},
    },
}
// GET /projects with "api-key-user-1" must NOT return "user2-project"
```

---

## Error Handling

| Scenario | Behavior |
|----------|----------|
| No config found | Error: "Config not found. Run `aevs init` first." |
| Network failure | Error with message, preserve local state |
| Invalid api_key | Error: "Authentication failed" |
| Project not found | Error: "Project {id} not found" |
| Version not found | Error: "Version {ts} not found" |

---

## Git Integration

- **Branch tracking:** Before sync/merge, run `git symbolic-ref --short HEAD`
- **Purpose:** Visual indicator of which git branches used this version
- **Merge behavior:** Current branch overwrites version branch (with optional custom input)

---

## Concurrency

- **Concurrent sync:** Multiple users syncing simultaneously will each create their own new versions
- **No locking:** No optimistic/pessimistic locking mechanism
- **Resolution:** Conflicts between versions are resolved via `aevs merge`

---

## Constants

```go
const (
    DefaultConfig = "aevs.yaml"
    DefaultAPIURL = "https://api.aevs.io"
    DefaultCreator = "root" // TODO: get from api_key user info
)
```