# project_manager.py
#
# Copyright 2025 Pavel Baksy
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.
#
# SPDX-License-Identifier: GPL-3.0-or-later

import json
import uuid
from pathlib import Path
from typing import List
from datetime import datetime, timezone
from .models import Project, SavedRequest, HttpRequest


class ProjectManager:
    """Manages project and saved request persistence."""

    def __init__(self):
        # Store in ~/.roster/ (not ~/.config/) for git versioning
        self.data_dir = Path.home() / '.roster'
        self.projects_file = self.data_dir / 'requests.json'
        self._ensure_data_dir()

    def _ensure_data_dir(self):
        """Create data directory if it doesn't exist."""
        self.data_dir.mkdir(parents=True, exist_ok=True)

    def load_projects(self) -> List[Project]:
        """Load projects from JSON file."""
        if not self.projects_file.exists():
            return []

        try:
            with open(self.projects_file, 'r') as f:
                data = json.load(f)
            return [Project.from_dict(p) for p in data.get('projects', [])]
        except Exception as e:
            print(f"Error loading projects: {e}")
            return []

    def save_projects(self, projects: List[Project]):
        """Save projects to JSON file."""
        try:
            data = {
                'version': 1,
                'projects': [p.to_dict() for p in projects]
            }
            with open(self.projects_file, 'w') as f:
                json.dump(data, f, indent=2)
        except Exception as e:
            print(f"Error saving projects: {e}")

    def add_project(self, name: str) -> Project:
        """Create new project."""
        projects = self.load_projects()
        project = Project(
            id=str(uuid.uuid4()),
            name=name,
            requests=[],
            created_at=datetime.now(timezone.utc).isoformat()
        )
        projects.append(project)
        self.save_projects(projects)
        return project

    def update_project(self, project_id: str, new_name: str = None, new_icon: str = None):
        """Update a project's name and/or icon."""
        projects = self.load_projects()
        for p in projects:
            if p.id == project_id:
                if new_name is not None:
                    p.name = new_name
                if new_icon is not None:
                    p.icon = new_icon
                break
        self.save_projects(projects)

    def delete_project(self, project_id: str):
        """Delete a project and all its requests."""
        projects = self.load_projects()
        projects = [p for p in projects if p.id != project_id]
        self.save_projects(projects)

    def add_request(self, project_id: str, name: str, request: HttpRequest) -> SavedRequest:
        """Add request to a project."""
        projects = self.load_projects()
        now = datetime.now(timezone.utc).isoformat()
        saved_request = SavedRequest(
            id=str(uuid.uuid4()),
            name=name,
            request=request,
            created_at=now,
            modified_at=now
        )
        for p in projects:
            if p.id == project_id:
                p.requests.append(saved_request)
                break
        self.save_projects(projects)
        return saved_request

    def delete_request(self, project_id: str, request_id: str):
        """Delete a saved request."""
        projects = self.load_projects()
        for p in projects:
            if p.id == project_id:
                p.requests = [r for r in p.requests if r.id != request_id]
                break
        self.save_projects(projects)