compact_sets/webapp/server.py

#!/usr/bin/env python
"""
Flask server for Path Navigator with OSC support.
"""

from flask import Flask, jsonify, request, send_from_directory
import json
import os
from pathlib import Path

# Add parent directory to path for imports
import sys

sys.path.insert(0, str(Path(__file__).parent.parent))

from src.pitch import Pitch
from src.osc_sender import OSCSender
from fractions import Fraction

app = Flask(__name__)

# Path to output directory
DATA_DIR = Path(__file__).parent.parent / "output"
DEFAULT_FILE = "output_chords.json"  # default file

# State
current_index = 0
chords = []

# OSC settings
fundamental = 110.0
osc_sender = OSCSender(ip="127.0.0.1", port=57120, fundamental=fundamental)


def load_chords(filepath=None):
    global chords, current_index
    if filepath is None:
        filepath = DATA_DIR / DEFAULT_FILE
    if filepath.exists():
        with open(filepath) as f:
            data = json.load(f)
            chords = data.get("chords", [])
        current_index = 0
    else:
        chords = []


load_chords()


def parse_fraction(frac_str):
    """Parse a fraction string to float."""
    if isinstance(frac_str, (int, float)):
        return float(frac_str)
    if "/" in frac_str:
        num, den = frac_str.split("/")
        return int(num) / int(den)
    return float(frac_str)


def calculate_cents(fraction_str):
    """Calculate cents from fraction string."""
    import math

    fr = parse_fraction(fraction_str)
    if fr <= 0:
        return 0
    return 1200 * math.log2(fr)


@app.route("/")
def index():
    return send_from_directory(".", "path_navigator.html")


@app.route("/<path:filename>")
def serve_static(filename):
    return send_from_directory(".", filename)


@app.route("/api/chords")
def get_chords():
    return jsonify({"chords": chords, "total": len(chords)})


@app.route("/api/set-fundamental", methods=["POST"])
def set_fundamental():
    """Set the fundamental frequency for OSC playback."""
    global fundamental, osc_sender
    data = request.json
    fundamental = data.get("fundamental", 110.0)
    osc_sender = OSCSender(ip="127.0.0.1", port=57120, fundamental=fundamental)
    return jsonify({"fundamental": fundamental})


@app.route("/api/play-freq", methods=["POST"])
def play_freq():
    """Play a single frequency for a node."""
    data = request.json
    chord_index = data.get("chordIndex")
    node_index = data.get("nodeIndex")
    octave = data.get("octave", 0)

    if chord_index < 0 or chord_index >= len(chords):
        return jsonify({"error": "Invalid chord index"}), 400

    chord = chords[chord_index]
    if node_index < 0 or node_index >= len(chord):
        return jsonify({"error": "Invalid node index"}), 400

    pitch = chord[node_index]
    fraction = Fraction(pitch.get("fraction", "1"))
    frequency = fundamental * float(fraction) * (2**octave)
    voice = node_index + 1  # 1-indexed

    osc_sender.send_single(frequency, voice)

    return jsonify(
        {
            "frequency": frequency,
            "voice": voice,
            "fundamental": fundamental,
            "fraction": pitch.get("fraction", "1"),
        }
    )


@app.route("/api/play-siren", methods=["POST"])
def play_siren():
    """Play a single frequency for a node on the siren."""
    data = request.json
    chord_index = data.get("chordIndex")
    node_index = data.get("nodeIndex")

    if chord_index < 0 or chord_index >= len(chords):
        return jsonify({"error": "Invalid chord index"}), 400

    chord = chords[chord_index]
    if node_index < 0 or node_index >= len(chord):
        return jsonify({"error": "Invalid node index"}), 400

    pitch = chord[node_index]
    fraction = Fraction(pitch.get("fraction", "1"))
    frequency = fundamental * float(fraction)
    voice = node_index + 1  # 1-indexed

    # Send to siren (192.168.4.200:54001) using current fundamental
    siren_sender = OSCSender(ip="192.168.4.200", port=54001, fundamental=fundamental)
    siren_sender.set_chords(chords)  # Set chords to ensure proper voice count
    siren_sender.send_single(frequency, voice)

    return jsonify(
        {
            "frequency": frequency,
            "voice": voice,
            "fundamental": fundamental,
            "fraction": pitch.get("fraction", "1"),
            "destination": "siren",
        }
    )


@app.route("/api/kill-siren", methods=["POST"])
def kill_siren():
    """Send kill message to siren (soft or hard)."""
    data = request.json
    soft = data.get("soft", True)  # default to soft kill

    kill_freq = 20.0 if soft else 0.0
    kill_type = "soft" if soft else "hard"

    # Send kill to all voices on siren using send_kill
    siren_sender = OSCSender(ip="192.168.4.200", port=54001, fundamental=fundamental)
    siren_sender.set_chords(chords)  # Set chords to get correct num_voices
    siren_sender.send_kill(soft=soft)

    return jsonify(
        {
            "kill_freq": kill_freq,
            "kill_type": kill_type,
            "voices": list(range(1, siren_sender.num_voices + 1)),
        }
    )


@app.route("/api/load-file", methods=["POST"])
def load_file():
    global current_index, chords
    data = request.json
    filepath = data.get("filepath")

    if not filepath:
        return jsonify({"error": "No filepath provided"}), 400

    try:
        with open(filepath) as f:
            chords_data = json.load(f)
            chords = chords_data.get("chords", [])
        current_index = 0
        return jsonify({"loaded": len(chords), "filepath": filepath})
    except FileNotFoundError:
        return jsonify({"error": f"File not found: {filepath}"}), 404
    except json.JSONDecodeError:
        return jsonify({"error": f"Invalid JSON in: {filepath}"}), 400


@app.route("/api/parse-fraction", methods=["POST"])
def parse_fraction_api():
    """Parse a fraction string to float."""
    data = request.json
    fraction = data.get("fraction", "1")
    try:
        value = parse_fraction(fraction)
        return jsonify({"fraction": fraction, "value": value})
    except Exception as e:
        return jsonify({"error": str(e)}), 400


@app.route("/api/calculate-cents", methods=["POST"])
def calculate_cents_api():
    """Calculate cents from fraction string."""
    data = request.json
    fraction = data.get("fraction", "1")
    try:
        cents = calculate_cents(fraction)
        return jsonify({"fraction": fraction, "cents": cents})
    except Exception as e:
        return jsonify({"error": str(e)}), 400


@app.route("/api/batch-calculate-cents", methods=["POST"])
def batch_calculate_cents_api():
    """Calculate cents for multiple fractions at once."""
    data = request.json
    fractions = data.get("fractions", [])
    try:
        results = []
        for fraction in fractions:
            cents = calculate_cents(fraction)
            results.append({"fraction": fraction, "cents": cents})
        return jsonify({"results": results})
    except Exception as e:
        return jsonify({"error": str(e)}), 400


if __name__ == "__main__":
    print("Starting Path Navigator server...")
    filepath = DATA_DIR / DEFAULT_FILE
    print(f"Loading chords from: {filepath}")
    load_chords()
    print(f"Loaded {len(chords)} chords")
    app.run(host="0.0.0.0", port=8080, debug=True)