from flask import Blueprint, jsonify, request, current_app
from utils.data_loader import load_data
from utils.json_crud import load_json, save_json, add_entry, delete_entry, update_entry
from models.project_model import ProjectModel
import os

DATA_DIR = os.path.join(os.path.dirname(__file__), '../data')
PROJECTS_FILE = os.path.join(DATA_DIR, 'projects.json')

projects_bp = Blueprint('projects', __name__, url_prefix='/api/projects')

@projects_bp.route('/', methods=['GET'])
def get_projects():
    projects = load_data('projects.json')
    return jsonify(projects)

@projects_bp.route('/<project_id>', methods=['GET'])
def get_project(project_id):
    projects = load_data('projects.json')
    # Ensure numeric comparison for id
    project = next((p for p in projects if str(p.get('id')) == str(project_id)), None)
    if not project:
        return jsonify({"error": "Project not found"}), 404
    return jsonify(project)

@projects_bp.route('/', methods=['POST'])
def create_project():
    key = request.headers.get('x-api-key')
    
    if key != current_app.config['API_KEY']:
        return jsonify({
            "error": "Unauthorized"
        }), 401
    projects = load_data('projects.json')
    entry = request.json or {}

    project = ProjectModel(entry)

    if not project.is_valid():
        return jsonify({
            "error": "Invalid project data"
        }), 400

    new_id = max((p.get('id') for p in projects), default=0) + 1

    data = project.to_dict()
    data['id'] = new_id

    added = add_entry(PROJECTS_FILE, data)
    return jsonify(added), 201

@projects_bp.route('/<project_id>', methods=['PUT', 'PATCH'])
def update_project(project_id):
    key = request.headers.get('x-api-key')
    if key != current_app.config['API_KEY']:
        return jsonify({"error": "Unauthorized"}), 401

    projects = load_json(PROJECTS_FILE)
    project = next((p for p in projects if str(p.get('id')) == str(project_id)), None)
    if not project:
        return jsonify({"error": "Project not found"}), 404

    payload = request.json or {}
    # Merge existing with payload
    updated = {**project, **payload}
    # Preserve id
    updated['id'] = project['id']

    # Validate using model
    model = ProjectModel(updated)
    if not model.is_valid():
        return jsonify({"error": "Invalid project data"}), 400

    saved = update_entry(PROJECTS_FILE, updated['id'], model.to_dict())
    return jsonify(saved), 200

@projects_bp.route('/<project_id>', methods=['DELETE'])
def delete_project(project_id):
    key = request.headers.get('x-api-key')
    if key != current_app.config['API_KEY']:
        return jsonify({"error": "Unauthorized"}), 401

    projects = load_json(PROJECTS_FILE)
    project = next((p for p in projects if str(p.get('id')) == str(project_id)), None)

    if project:
        deleted = delete_entry(PROJECTS_FILE, project_id)
        return jsonify(deleted), 200
    return jsonify({"error": "Project not found"}), 404