fractafrag/services/mcp/server.py

"""
Fractafrag MCP Server — AI agent interface to the shader platform.

Enables Claude, GPT, and other MCP clients to:
- Browse and search shaders
- Get full shader details by ID
- Submit new shaders
- Update existing shaders (push revisions)
- View version history
- Browse the desire queue
"""

import os
import json
import httpx
from mcp.server.fastmcp import FastMCP

API_BASE = os.environ.get("API_BASE_URL", "http://api:8000")
INTERNAL_AUTH = {"Authorization": "Bearer internal:mcp-service"}

mcp = FastMCP(
    "Fractafrag",
    stateless_http=True,
    json_response=True,
    host="0.0.0.0",
    port=3200,
)


async def api_get(path: str, params: dict | None = None):
    async with httpx.AsyncClient(base_url=API_BASE, timeout=15.0) as client:
        resp = await client.get(f"/api/v1{path}", params=params)
        resp.raise_for_status()
        return resp.json()


async def api_post(path: str, data: dict):
    async with httpx.AsyncClient(base_url=API_BASE, timeout=15.0) as client:
        resp = await client.post(f"/api/v1{path}", json=data, headers=INTERNAL_AUTH)
        resp.raise_for_status()
        return resp.json()


async def api_put(path: str, data: dict):
    async with httpx.AsyncClient(base_url=API_BASE, timeout=15.0) as client:
        resp = await client.put(f"/api/v1{path}", json=data, headers=INTERNAL_AUTH)
        resp.raise_for_status()
        return resp.json()


@mcp.tool()
async def browse_shaders(query: str = "", tags: str = "", shader_type: str = "", sort: str = "trending", limit: int = 20) -> str:
    """Browse and search shaders on Fractafrag.

    Args:
        query: Search text (matches title)
        tags: Comma-separated tag filter (e.g. "fractal,colorful")
        shader_type: Filter by type: 2d, 3d, or audio-reactive
        sort: Sort order: trending, new, or top
        limit: Number of results (1-50)
    """
    params: dict = {"sort": sort, "limit": min(limit, 50)}
    if query: params["q"] = query
    if tags: params["tags"] = [t.strip() for t in tags.split(",") if t.strip()]
    if shader_type: params["shader_type"] = shader_type

    shaders = await api_get("/shaders", params)
    results = [{"id": s["id"], "title": s["title"], "description": s.get("description", ""),
                "shader_type": s["shader_type"], "tags": s.get("tags", []),
                "score": s.get("score", 0), "view_count": s.get("view_count", 0),
                "is_system": s.get("is_system", False), "current_version": s.get("current_version", 1)}
               for s in shaders]
    return json.dumps({"count": len(results), "shaders": results})


@mcp.tool()
async def get_shader(shader_id: str) -> str:
    """Get full details of a shader by its ID, including GLSL source code.

    Args:
        shader_id: UUID of the shader
    """
    s = await api_get(f"/shaders/{shader_id}")
    return json.dumps({"id": s["id"], "title": s["title"], "description": s.get("description"),
                        "glsl_code": s["glsl_code"], "shader_type": s["shader_type"],
                        "tags": s.get("tags", []), "status": s.get("status"),
                        "is_system": s.get("is_system", False), "style_metadata": s.get("style_metadata"),
                        "current_version": s.get("current_version", 1),
                        "score": s.get("score", 0), "view_count": s.get("view_count", 0),
                        "forked_from": s.get("forked_from"), "created_at": s.get("created_at"),
                        "updated_at": s.get("updated_at")})


@mcp.tool()
async def get_shader_versions(shader_id: str) -> str:
    """Get the version history of a shader.

    Args:
        shader_id: UUID of the shader
    """
    versions = await api_get(f"/shaders/{shader_id}/versions")
    return json.dumps({"shader_id": shader_id, "version_count": len(versions),
                        "versions": [{"version_number": v["version_number"], "title": v["title"],
                                      "change_note": v.get("change_note"), "created_at": v["created_at"]}
                                     for v in versions]})


@mcp.tool()
async def get_shader_version_code(shader_id: str, version_number: int) -> str:
    """Get the GLSL code of a specific version of a shader.

    Args:
        shader_id: UUID of the shader
        version_number: Version number to retrieve
    """
    v = await api_get(f"/shaders/{shader_id}/versions/{version_number}")
    return json.dumps({"shader_id": shader_id, "version_number": v["version_number"],
                        "title": v["title"], "glsl_code": v["glsl_code"],
                        "tags": v.get("tags", []), "change_note": v.get("change_note")})


@mcp.tool()
async def submit_shader(title: str, glsl_code: str, description: str = "", tags: str = "",
                         shader_type: str = "2d", status: str = "published") -> str:
    """Submit a new GLSL shader to Fractafrag.

    Shader format: void mainImage(out vec4 fragColor, in vec2 fragCoord)
    Uniforms: iTime (float), iResolution (vec3), iMouse (vec4)

    Args:
        title: Shader title (max 120 chars)
        glsl_code: Complete GLSL fragment shader code
        description: Optional description
        tags: Comma-separated tags (e.g. "fractal,noise,colorful")
        shader_type: 2d, 3d, or audio-reactive
        status: "published" to go live, "draft" to save privately
    """
    tag_list = [t.strip() for t in tags.split(",") if t.strip()] if tags else []
    result = await api_post("/shaders", {"title": title, "glsl_code": glsl_code,
                                          "description": description, "tags": tag_list,
                                          "shader_type": shader_type, "status": status})
    return json.dumps({"id": result["id"], "title": result["title"],
                        "status": result.get("status"), "current_version": result.get("current_version", 1),
                        "message": f"Shader '{result['title']}' created.", "url": f"/shader/{result['id']}"})


@mcp.tool()
async def update_shader(shader_id: str, glsl_code: str = "", title: str = "",
                         description: str = "", tags: str = "", status: str = "",
                         change_note: str = "") -> str:
    """Update an existing shader. Creates a new version in the history.

    Use this to iterate — change code, adjust metadata, or publish a draft.
    Every code change creates an immutable version snapshot.

    Args:
        shader_id: UUID of the shader to update
        glsl_code: New GLSL code (empty = keep current)
        title: New title (empty = keep current)
        description: New description (empty = keep current)
        tags: New comma-separated tags (empty = keep current)
        status: Change status: draft, published, or archived
        change_note: Brief note about what changed (e.g. "made it pinker")
    """
    payload = {}
    if glsl_code: payload["glsl_code"] = glsl_code
    if title: payload["title"] = title
    if description: payload["description"] = description
    if tags: payload["tags"] = [t.strip() for t in tags.split(",") if t.strip()]
    if status: payload["status"] = status
    if change_note: payload["change_note"] = change_note
    if not payload:
        return json.dumps({"error": "No changes provided."})

    result = await api_put(f"/shaders/{shader_id}", payload)
    return json.dumps({"id": result["id"], "title": result["title"], "status": result.get("status"),
                        "current_version": result.get("current_version"),
                        "message": f"Updated to v{result.get('current_version', '?')}.",
                        "url": f"/shader/{result['id']}"})


@mcp.tool()
async def get_trending(limit: int = 10) -> str:
    """Get currently trending shaders.

    Args:
        limit: Number of results (1-50)
    """
    shaders = await api_get("/feed/trending", {"limit": min(limit, 50)})
    return json.dumps({"count": len(shaders),
                        "shaders": [{"id": s["id"], "title": s["title"], "shader_type": s["shader_type"],
                                     "tags": s.get("tags", []), "score": s.get("score", 0)}
                                    for s in shaders]})


@mcp.tool()
async def get_desire_queue(min_heat: float = 0, limit: int = 10) -> str:
    """Get open shader desires/bounties. These are community requests.

    Args:
        min_heat: Minimum heat score (higher = more demand)
        limit: Number of results (1-20)
    """
    desires = await api_get("/desires", {"min_heat": min_heat, "limit": min(limit, 20)})
    return json.dumps({"count": len(desires),
                        "desires": [{"id": d["id"], "prompt_text": d["prompt_text"],
                                     "heat_score": d.get("heat_score", 0),
                                     "tip_amount_cents": d.get("tip_amount_cents", 0),
                                     "status": d.get("status")}
                                    for d in desires]})


@mcp.resource("fractafrag://platform-info")
def platform_info() -> str:
    """Platform overview and shader writing guidelines."""
    return """# Fractafrag — GLSL Shader Platform

## Shader Format (Shadertoy-compatible, WebGL2 / GLSL ES 3.00)
```glsl
void mainImage(out vec4 fragColor, in vec2 fragCoord) {
    vec2 uv = fragCoord / iResolution.xy;
    fragColor = vec4(color, 1.0);
}
```

## Uniforms: iTime (float), iResolution (vec3), iMouse (vec4)

## Workflow
1. browse_shaders to see what exists
2. get_shader to read code by ID
3. submit_shader to create new, or update_shader to revise existing
4. Every code update creates a versioned snapshot
5. get_shader_versions / get_shader_version_code for history
"""


if __name__ == "__main__":
    print(f"Fractafrag MCP server starting on :3200")
    print(f"API backend: {API_BASE}")
    mcp.run(transport="streamable-http")