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"""Main installer logic."""

import asyncio
import logging
import platform
import sys
from pathlib import Path

from rich.console import Console
from rich.panel import Panel
from rich.prompt import Prompt

from ..agent_discovery import AgentDiscovery, AgentMetadata
from .agent_selector import AgentSelector
from .config_generator import ConfigGenerator
from .mcp_configurator import MCPConfigurator
from .task_mapper import TASK_CATEGORIES, TaskMapper

logger = logging.getLogger(__name__)
console = Console()


class DelegationInstaller:
    """Automated installer for delegation-mcp."""

    def __init__(self):
        self.project_dir = Path.cwd()
        self.agent_discovery = AgentDiscovery()
        self.mcp_configurator = MCPConfigurator()
        self.agent_selector = AgentSelector()
        self.task_mapper = TaskMapper()
        self.config_generator = ConfigGenerator()
        self.discovered_agents: dict[str, AgentMetadata] = {}
        self.selected_agents: list[str] = []
        self.task_mappings: dict[str, str] = {}

    def install(self) -> bool:
        """Run full installation."""
        try:
            self._welcome()

            if not self._check_system():
                return False

            asyncio.run(self._discover_agents())

            if not self.discovered_agents:
                self._no_agents_guide()
                return False

            # Select which agents to enable
            self.selected_agents = self._select_agents()
            if len(self.selected_agents) < 2:
                console.print("[red]Need at least 2 agents for delegation.[/red]")
                return False

            # Select primary orchestrator
            self.selected_orchestrator = "claude"
            # Check if Claude is available
            if "claude" not in self.discovered_agents:
                 console.print("[yellow]Claude Code not detected. Please install it first: npm install -g @anthropic/claude-code[/yellow]")
                 return False

            # Map tasks to agents
            if len(self.selected_agents) >= 2:
                self.task_mappings = self._map_tasks()

            # Ask about installation scope
            install_project_instructions, install_user_instructions, mcp_scope = self._ask_user_level_instructions()

            # Get the actual path to Claude executable
            orchestrator_path = None
            if "claude" in self.discovered_agents:
                orchestrator_path = self.discovered_agents["claude"].path

            if not self._configure_mcp(install_project_instructions, install_user_instructions, orchestrator_path, mcp_scope):
                return False

            self._print_success()
            return True

        except KeyboardInterrupt:
            console.print("\n[yellow]Installation cancelled[/yellow]")
            return False
        except Exception as e:
            console.print(f"\n[red]Installation failed: {e}[/red]")
            logger.error(f"Installation error: {e}", exc_info=True)
            return False

    def _welcome(self):
        """Print welcome message."""
        console.print(Panel.fit(
            "[bold blue]Delegation MCP Installer[/bold blue]\n"
            "Automated multi-agent orchestration setup",
            border_style="blue"
        ))

    def _check_system(self) -> bool:
        """Check system requirements."""
        console.print("\n[bold]Checking system requirements...[/bold]")

        # Check Python version
        if sys.version_info < (3, 10):
            console.print(f"[red]X Python 3.10+ required (found {sys.version_info.major}.{sys.version_info.minor})[/red]")
            return False
        console.print(f"[green]OK Python {sys.version_info.major}.{sys.version_info.minor}[/green]")

        # Check OS
        system = platform.system()
        console.print(f"[green]OK {system}[/green]")

        return True

    async def _discover_agents(self):
        """Discover available agents."""
        console.print("\n[bold]Discovering agents...[/bold]")

        discovered = await self.agent_discovery.discover_agents(force_refresh=True)
        self.discovered_agents = {k: v for k, v in discovered.items() if v.available}

        if self.discovered_agents:
            console.print(f"[green]Found {len(self.discovered_agents)} agents:[/green]")
            for name, meta in self.discovered_agents.items():
                console.print(f"  [green]OK[/green] {name} ({meta.version})")
        else:
            console.print("[yellow]No agents detected[/yellow]")

    def _no_agents_guide(self):
        """Guide user to install agents."""
        console.print("\n[bold yellow]No agents detected![/bold yellow]\n")
        console.print("Install Claude Code:")
        console.print("  • Claude Code: npm install -g @anthropic/claude-code\n")
        console.print("Then run: [bold]python install.py[/bold]")

    def _select_agents(self) -> list[str]:
        """Let user select which agents to enable."""
        return self.agent_selector.prompt_selection(self.discovered_agents)



    def _map_tasks(self) -> dict[str, str]:
        """Interactive task-to-agent mapping."""
        console.print("\n[bold]Task Assignment Configuration[/bold]")
        console.print("Configure which agents should handle which types of tasks.\n")
        return self.task_mapper.map_tasks(self.selected_agents)

    def _ask_user_level_instructions(self) -> tuple[bool, bool, str]:
        """
        Ask where to install system instructions and MCP server.
        
        Returns:
            Tuple of (install_project_level, install_user_level, mcp_scope)
        """
        console.print("\n[bold]Installation Scope:[/bold]")
        
        console.print("  1. Project-level only (.claude/CLAUDE.md + local MCP) - Only for this project")
        console.print("  2. User-level only (~/.claude/CLAUDE.md + global MCP) - For ALL Claude sessions")
        console.print("  3. Both project and user level (project instructions + global MCP)")
        
        console.print(f"\n[dim]Recommended: Option 1 for project-specific setup, or 2 for global access.[/dim]")
        
        choice = Prompt.ask(
            "Choose installation scope",
            choices=["1", "2", "3"],
            default="1"
        )
        
        if choice == "1":
            return (True, False, "local")  # Project only
        elif choice == "2":
            return (False, True, "user")  # User only
        else:
            return (True, True, "user")  # Both (use user scope for MCP)


    def _configure_mcp(self, install_project_instructions: bool = True, install_user_instructions: bool = False, orchestrator_path: Path = None, scope: str = "local") -> bool:
        """Configure MCP client for Claude (the only orchestrator)."""
        console.print(f"\n[bold]Configuring MCP client and delegation rules for Claude...[/bold]")

        # Generate delegation configuration files
        if self.task_mappings and len(self.selected_agents) >= 2:
            console.print("\n[cyan]Generating delegation configuration files...[/cyan]")
            self.config_generator.generate_configs(
                selected_agents=self.selected_agents,
                task_mappings=self.task_mappings,
                agent_metadata=self.discovered_agents,
                primary_orchestrator="claude",
                project_dir=self.project_dir,
                scope=scope,
            )
            console.print("[green]✓ Configuration files generated[/green]")

        # Configure MCP server
        results = self.mcp_configurator.inject_delegation_mcp(
            self.project_dir, 
            "claude",  # Claude is the only orchestrator
            install_project_instructions,
            install_user_instructions,
            orchestrator_path,
            scope,
            task_mappings=self.task_mappings,
            selected_agents=self.selected_agents,
        )

        configured_any = False

        for client, success in results.get("clients", {}).items():
            if success:
                console.print(f"[green]OK {client}: delegation-mcp registered[/green]")
                configured_any = True
            else:
                console.print(f"[yellow]! {client} not configured automatically[/yellow]")

        for message in results.get("messages", []):
            console.print(message)

        manual_steps = results.get("manual_instructions", [])
        if manual_steps:
            console.print("\n[bold]Manual setup required:[/bold]")
            for step in manual_steps:
                console.print(f"  [cyan]{step}[/cyan]")

        # Claude supports auto-injection, so no manual instructions needed
        if not configured_any and not results.get("allow_continue", False):
            console.print("[red]X Failed to configure MCP client automatically.[/red]")
            return False

        return True

    def _print_success(self):
        """Print success message."""
        console.print(f"\n[bold cyan]For Claude:[/bold cyan]")
        console.print("  1. Restart Claude Desktop app")
        console.print("  2. Open a chat and try: [cyan]'scan for security vulnerabilities'[/cyan]")
        
        console.print("\n[bold]The system will automatically:[/bold]")
        
        # Dynamic task routing summary grouped by agent
        if self.task_mappings:
            # Create a lookup for task names
            task_names = {cat["key"]: cat["name"] for cat in TASK_CATEGORIES}
            
            # Group tasks by agent
            agent_tasks = {}
            for task_key, agent in self.task_mappings.items():
                task_name = task_names.get(task_key, task_key)
                if agent not in agent_tasks:
                    agent_tasks[agent] = []
                agent_tasks[agent].append(task_name)
            
            # Display grouped by agent
            for agent, tasks in sorted(agent_tasks.items()):
                tasks_str = ", ".join(tasks)
                console.print(f"  • Route {tasks_str} to {agent}")
        
        console.print("  • Fall back if agent fails")


def main():
    """CLI entry point."""
    logging.basicConfig(level=logging.INFO)
    installer = DelegationInstaller()
    success = installer.install()
    sys.exit(0 if success else 1)


if __name__ == "__main__":
    main()