"""
AUTARCH Pentest Pipeline
Three-module architecture (Parsing -> Reasoning -> Generation)
based on PentestGPT's USENIX paper methodology.
Uses AUTARCH's local LLM via llama-cpp-python.
"""

import re
from typing import Optional, List, Dict, Any, Tuple
from datetime import datetime

from .pentest_tree import PentestTree, PTTNode, PTTNodeType, NodeStatus
from .config import get_config


# ─── Source type detection patterns ──────────────────────────────────

SOURCE_PATTERNS = {
    'nmap': re.compile(r'Nmap scan report|PORT\s+STATE\s+SERVICE|nmap', re.IGNORECASE),
    'msf_scan': re.compile(r'auxiliary/scanner|msf\d?\s*>.*auxiliary|^\[\*\]\s.*scanning', re.IGNORECASE | re.MULTILINE),
    'msf_exploit': re.compile(r'exploit/|meterpreter|session\s+\d+\s+opened|^\[\*\]\s.*exploit', re.IGNORECASE | re.MULTILINE),
    'msf_post': re.compile(r'post/|meterpreter\s*>', re.IGNORECASE),
    'web': re.compile(r'HTTP/\d|<!DOCTYPE|<html|Content-Type:', re.IGNORECASE),
    'shell': re.compile(r'^\$\s|^root@|^#\s|bash|zsh', re.IGNORECASE | re.MULTILINE),
    'gobuster': re.compile(r'Gobuster|gobuster|Dir found|/\w+\s+\(Status:\s*\d+\)', re.IGNORECASE),
    'nikto': re.compile(r'Nikto|nikto|^\+\s', re.IGNORECASE | re.MULTILINE),
}


def detect_source_type(output: str) -> str:
    """Auto-detect tool output type from content patterns."""
    for source, pattern in SOURCE_PATTERNS.items():
        if pattern.search(output[:2000]):
            return source
    return 'manual'


# ─── Prompt Templates ────────────────────────────────────────────────

PARSING_SYSTEM_PROMPT = """You are a penetration testing output parser. Extract key findings from raw tool output.

Given raw output from a security tool, extract and summarize:
1. Open ports and services (with versions when available)
2. Vulnerabilities or misconfigurations found
3. Credentials or sensitive information discovered
4. Operating system and software versions
5. Any error messages or access denials

Rules:
- Be concise. Use bullet points.
- Include specific version numbers, port numbers, and IP addresses.
- Prefix exploitable findings with [VULN]
- Prefix credentials with [CRED]
- Note failed attempts and why they failed.
- Do not speculate beyond what the output shows.

Format your response as:
SUMMARY: one line description
FINDINGS:
- finding 1
- finding 2
- [VULN] vulnerability finding
STATUS: success/partial/failed"""

REASONING_SYSTEM_PROMPT = """You are a penetration testing strategist. You maintain a task tree and decide next steps.

You will receive:
1. The current task tree showing completed and todo tasks
2. New findings from the latest tool execution

Your job:
1. UPDATE the tree based on new findings
2. DECIDE the single most important next task

Rules:
- Prioritize exploitation paths with highest success likelihood.
- If a service version is known, suggest checking for known CVEs.
- After recon, focus on the most promising attack surface.
- Do not add redundant tasks.
- Mark tasks not-applicable if findings make them irrelevant.

Respond in this exact format:
TREE_UPDATES:
- ADD: parent_id | node_type | priority | task description
- COMPLETE: node_id | findings summary
- NOT_APPLICABLE: node_id | reason

NEXT_TASK: description of the single most important next action
REASONING: 1-2 sentences explaining why this is the highest priority"""

GENERATION_SYSTEM_PROMPT = """You are a penetration testing command generator. Convert task descriptions into specific executable commands.

Available tools:
- shell: Run shell command. Args: {"command": "...", "timeout": 30}
- msf_search: Search MSF modules. Args: {"query": "search term"}
- msf_module_info: Module details. Args: {"module_type": "auxiliary|exploit|post", "module_name": "path"}
- msf_execute: Run MSF module. Args: {"module_type": "...", "module_name": "...", "options": "{\\"RHOSTS\\": \\"...\\"}" }
- msf_sessions: List sessions. Args: {}
- msf_session_command: Command in session. Args: {"session_id": "...", "command": "..."}
- msf_console: MSF console command. Args: {"command": "..."}

Rules:
- Provide the EXACT tool name and JSON arguments.
- Describe what to look for in the output.
- If multiple steps needed, number them.
- Always include RHOSTS/target in module options.
- Prefer auxiliary scanners before exploits.

Format:
COMMANDS:
1. TOOL: tool_name | ARGS: {"key": "value"} | EXPECT: what to look for
2. TOOL: tool_name | ARGS: {"key": "value"} | EXPECT: what to look for
FALLBACK: alternative approach if primary fails"""

INITIAL_PLAN_PROMPT = """You are a penetration testing strategist planning an engagement.

Target: {target}

Create an initial reconnaissance plan. List the first 3-5 specific tasks to perform, ordered by priority.

Format:
TASKS:
1. node_type | priority | task description
2. node_type | priority | task description
3. node_type | priority | task description

FIRST_ACTION: description of the very first thing to do
REASONING: why start here"""

DISCUSS_SYSTEM_PROMPT = """You are a penetration testing expert assistant. Answer the user's question about their current engagement.

Current target: {target}

Current status:
{tree_summary}

Answer concisely and provide actionable advice."""


# ─── Pipeline Modules ────────────────────────────────────────────────

class ParsingModule:
    """Normalizes raw tool output into structured summaries."""

    def __init__(self, llm):
        self.llm = llm
        self.config = get_config()

    def parse(self, raw_output: str, source_type: str = "auto",
              context: str = "") -> dict:
        """Parse raw tool output into normalized summary.

        Returns dict with 'summary', 'findings', 'status', 'raw_source'.
        """
        if source_type == "auto":
            source_type = detect_source_type(raw_output)

        chunk_size = 2000
        try:
            chunk_size = self.config.get_int('pentest', 'output_chunk_size', 2000)
        except Exception:
            pass

        chunks = self._chunk_output(raw_output, chunk_size)

        all_findings = []
        all_summaries = []
        status = "unknown"

        for i, chunk in enumerate(chunks):
            prefix = f"[{source_type} output"
            if len(chunks) > 1:
                prefix += f" part {i+1}/{len(chunks)}"
            prefix += "]"

            message = f"{prefix}\n{chunk}"
            if context:
                message = f"Context: {context}\n\n{message}"

            self.llm.clear_history()
            try:
                response = self.llm.chat(
                    message,
                    system_prompt=PARSING_SYSTEM_PROMPT,
                    temperature=0.2,
                    max_tokens=512,
                )
            except Exception as e:
                return {
                    'summary': f"Parse error: {e}",
                    'findings': [],
                    'status': 'failed',
                    'raw_source': source_type,
                }

            summary, findings, chunk_status = self._parse_response(response)
            all_summaries.append(summary)
            all_findings.extend(findings)
            if chunk_status != "unknown":
                status = chunk_status

        return {
            'summary': " | ".join(all_summaries) if all_summaries else "No summary",
            'findings': all_findings,
            'status': status,
            'raw_source': source_type,
        }

    def _chunk_output(self, output: str, max_chunk: int = 2000) -> List[str]:
        """Split large output into chunks."""
        if len(output) <= max_chunk:
            return [output]
        chunks = []
        lines = output.split('\n')
        current = []
        current_len = 0
        for line in lines:
            if current_len + len(line) + 1 > max_chunk and current:
                chunks.append('\n'.join(current))
                current = []
                current_len = 0
            current.append(line)
            current_len += len(line) + 1
        if current:
            chunks.append('\n'.join(current))
        return chunks

    def _parse_response(self, response: str) -> Tuple[str, List[str], str]:
        """Extract summary, findings, and status from LLM response."""
        summary = ""
        findings = []
        status = "unknown"

        # Extract SUMMARY
        m = re.search(r'SUMMARY:\s*(.+)', response, re.IGNORECASE)
        if m:
            summary = m.group(1).strip()

        # Extract FINDINGS
        findings_section = re.search(
            r'FINDINGS:\s*\n((?:[-*]\s*.+\n?)+)',
            response, re.IGNORECASE
        )
        if findings_section:
            for line in findings_section.group(1).strip().split('\n'):
                line = re.sub(r'^[-*]\s*', '', line).strip()
                if line:
                    findings.append(line)

        # Extract STATUS
        m = re.search(r'STATUS:\s*(\w+)', response, re.IGNORECASE)
        if m:
            status = m.group(1).strip().lower()

        # Fallback: if structured parse failed, use full response
        if not summary and not findings:
            summary = response[:200].strip()
            for line in response.split('\n'):
                line = line.strip()
                if line.startswith(('-', '*', '[VULN]', '[CRED]')):
                    findings.append(re.sub(r'^[-*]\s*', '', line))

        return summary, findings, status


class ReasoningModule:
    """Maintains PTT and decides next actions."""

    def __init__(self, llm, tree: PentestTree):
        self.llm = llm
        self.tree = tree

    def reason(self, parsed_output: dict, context: str = "") -> dict:
        """Three-step reasoning: update tree, validate, extract next todo.

        Returns dict with 'tree_updates', 'next_task', 'reasoning'.
        """
        tree_summary = self.tree.render_summary()

        findings_text = parsed_output.get('summary', '')
        if parsed_output.get('findings'):
            findings_text += "\nFindings:\n"
            for f in parsed_output['findings']:
                findings_text += f"- {f}\n"

        message = (
            f"Current pentest tree:\n{tree_summary}\n\n"
            f"New information ({parsed_output.get('raw_source', 'unknown')}):\n"
            f"{findings_text}"
        )
        if context:
            message += f"\n\nAdditional context: {context}"

        self.llm.clear_history()
        try:
            response = self.llm.chat(
                message,
                system_prompt=REASONING_SYSTEM_PROMPT,
                temperature=0.3,
                max_tokens=1024,
            )
        except Exception as e:
            return {
                'tree_updates': [],
                'next_task': f"Error during reasoning: {e}",
                'reasoning': str(e),
            }

        updates = self._parse_tree_updates(response)
        self._apply_updates(updates)

        next_task = ""
        m = re.search(r'NEXT_TASK:\s*(.+)', response, re.IGNORECASE)
        if m:
            next_task = m.group(1).strip()

        reasoning = ""
        m = re.search(r'REASONING:\s*(.+)', response, re.IGNORECASE | re.DOTALL)
        if m:
            reasoning = m.group(1).strip().split('\n')[0]

        # Fallback: if no NEXT_TASK parsed, get from tree
        if not next_task:
            todo = self.tree.get_next_todo()
            if todo:
                next_task = todo.label

        return {
            'tree_updates': updates,
            'next_task': next_task,
            'reasoning': reasoning,
        }

    def _parse_tree_updates(self, response: str) -> List[dict]:
        """Extract tree operations from LLM response."""
        updates = []

        # Parse ADD operations
        for m in re.finditer(
            r'ADD:\s*(\S+)\s*\|\s*(\w+)\s*\|\s*(\d)\s*\|\s*(.+)',
            response, re.IGNORECASE
        ):
            parent = m.group(1).strip()
            if parent.lower() in ('root', 'none', '-'):
                parent = None
            ntype_str = m.group(2).strip().lower()
            ntype = self._map_node_type(ntype_str)
            updates.append({
                'operation': 'add',
                'parent_id': parent,
                'node_type': ntype,
                'priority': int(m.group(3)),
                'label': m.group(4).strip(),
            })

        # Parse COMPLETE operations
        for m in re.finditer(
            r'COMPLETE:\s*(\S+)\s*\|\s*(.+)',
            response, re.IGNORECASE
        ):
            updates.append({
                'operation': 'complete',
                'node_id': m.group(1).strip(),
                'findings': m.group(2).strip(),
            })

        # Parse NOT_APPLICABLE operations
        for m in re.finditer(
            r'NOT_APPLICABLE:\s*(\S+)\s*\|\s*(.+)',
            response, re.IGNORECASE
        ):
            updates.append({
                'operation': 'not_applicable',
                'node_id': m.group(1).strip(),
                'reason': m.group(2).strip(),
            })

        return updates

    def _map_node_type(self, type_str: str) -> PTTNodeType:
        """Map a string to PTTNodeType."""
        mapping = {
            'recon': PTTNodeType.RECONNAISSANCE,
            'reconnaissance': PTTNodeType.RECONNAISSANCE,
            'initial_access': PTTNodeType.INITIAL_ACCESS,
            'initial': PTTNodeType.INITIAL_ACCESS,
            'access': PTTNodeType.INITIAL_ACCESS,
            'privesc': PTTNodeType.PRIVILEGE_ESCALATION,
            'privilege_escalation': PTTNodeType.PRIVILEGE_ESCALATION,
            'escalation': PTTNodeType.PRIVILEGE_ESCALATION,
            'lateral': PTTNodeType.LATERAL_MOVEMENT,
            'lateral_movement': PTTNodeType.LATERAL_MOVEMENT,
            'persistence': PTTNodeType.PERSISTENCE,
            'credential': PTTNodeType.CREDENTIAL_ACCESS,
            'credential_access': PTTNodeType.CREDENTIAL_ACCESS,
            'creds': PTTNodeType.CREDENTIAL_ACCESS,
            'exfiltration': PTTNodeType.EXFILTRATION,
            'exfil': PTTNodeType.EXFILTRATION,
        }
        return mapping.get(type_str.lower(), PTTNodeType.CUSTOM)

    def _apply_updates(self, updates: List[dict]):
        """Apply parsed operations to the tree."""
        for update in updates:
            op = update['operation']

            if op == 'add':
                # Resolve parent - could be an ID or a label
                parent_id = update.get('parent_id')
                if parent_id and parent_id not in self.tree.nodes:
                    # Try to find by label match
                    node = self.tree.find_node_by_label(parent_id)
                    parent_id = node.id if node else None

                self.tree.add_node(
                    label=update['label'],
                    node_type=update['node_type'],
                    parent_id=parent_id,
                    priority=update.get('priority', 3),
                )

            elif op == 'complete':
                node_id = update['node_id']
                if node_id not in self.tree.nodes:
                    node = self.tree.find_node_by_label(node_id)
                    if node:
                        node_id = node.id
                    else:
                        continue
                self.tree.update_node(
                    node_id,
                    status=NodeStatus.COMPLETED,
                    findings=[update.get('findings', '')],
                )

            elif op == 'not_applicable':
                node_id = update['node_id']
                if node_id not in self.tree.nodes:
                    node = self.tree.find_node_by_label(node_id)
                    if node:
                        node_id = node.id
                    else:
                        continue
                self.tree.update_node(
                    node_id,
                    status=NodeStatus.NOT_APPLICABLE,
                    details=update.get('reason', ''),
                )


class GenerationModule:
    """Converts abstract tasks into concrete commands."""

    def __init__(self, llm):
        self.llm = llm

    def generate(self, task_description: str, target: str,
                 context: str = "") -> dict:
        """Generate executable commands for a task.

        Returns dict with 'commands' (list) and 'fallback' (str).
        """
        message = f"Target: {target}\nTask: {task_description}"
        if context:
            message += f"\n\nContext: {context}"

        self.llm.clear_history()
        try:
            response = self.llm.chat(
                message,
                system_prompt=GENERATION_SYSTEM_PROMPT,
                temperature=0.2,
                max_tokens=512,
            )
        except Exception as e:
            return {
                'commands': [],
                'fallback': f"Generation error: {e}",
                'raw_response': str(e),
            }

        commands = self._parse_commands(response)
        fallback = ""
        m = re.search(r'FALLBACK:\s*(.+)', response, re.IGNORECASE | re.DOTALL)
        if m:
            fallback = m.group(1).strip().split('\n')[0]

        return {
            'commands': commands,
            'fallback': fallback,
            'raw_response': response,
        }

    def _parse_commands(self, response: str) -> List[dict]:
        """Extract commands from LLM response."""
        commands = []

        # Parse structured TOOL: ... | ARGS: ... | EXPECT: ... format
        for m in re.finditer(
            r'TOOL:\s*(\w+)\s*\|\s*ARGS:\s*(\{[^}]+\})\s*\|\s*EXPECT:\s*(.+)',
            response, re.IGNORECASE
        ):
            tool_name = m.group(1).strip()
            args_str = m.group(2).strip()
            expect = m.group(3).strip()

            # Try to parse JSON args
            import json
            try:
                args = json.loads(args_str)
            except json.JSONDecodeError:
                # Try fixing common LLM JSON issues
                fixed = args_str.replace("'", '"')
                try:
                    args = json.loads(fixed)
                except json.JSONDecodeError:
                    args = {'raw': args_str}

            commands.append({
                'tool': tool_name,
                'args': args,
                'expect': expect,
            })

        # Fallback: try to find shell commands or MSF commands
        if not commands:
            for line in response.split('\n'):
                line = line.strip()
                # Detect nmap/shell commands
                if re.match(r'^(nmap|nikto|gobuster|curl|wget|nc|netcat)\s', line):
                    commands.append({
                        'tool': 'shell',
                        'args': {'command': line},
                        'expect': 'Check output for results',
                    })
                # Detect MSF use/run commands
                elif re.match(r'^(use |run |set )', line, re.IGNORECASE):
                    commands.append({
                        'tool': 'msf_console',
                        'args': {'command': line},
                        'expect': 'Check output for results',
                    })

        return commands


# ─── Pipeline Orchestrator ────────────────────────────────────────────

class PentestPipeline:
    """Orchestrates the three-module pipeline."""

    def __init__(self, llm, target: str, tree: PentestTree = None):
        self.llm = llm
        self.target = target
        self.tree = tree or PentestTree(target)
        self.parser = ParsingModule(llm)
        self.reasoner = ReasoningModule(llm, self.tree)
        self.generator = GenerationModule(llm)
        self.history: List[dict] = []

    def process_output(self, raw_output: str,
                       source_type: str = "auto") -> dict:
        """Full pipeline: parse -> reason -> generate.

        Returns dict with 'parsed', 'reasoning', 'commands', 'next_task'.
        """
        # Step 1: Parse
        parsed = self.parser.parse(raw_output, source_type)

        # Step 2: Reason
        reasoning = self.reasoner.reason(parsed)

        # Step 3: Generate commands for the next task
        generated = {'commands': [], 'fallback': ''}
        if reasoning.get('next_task'):
            # Build context from recent findings
            context = parsed.get('summary', '')
            generated = self.generator.generate(
                reasoning['next_task'],
                self.target,
                context=context,
            )

        result = {
            'parsed': parsed,
            'reasoning': reasoning,
            'commands': generated.get('commands', []),
            'fallback': generated.get('fallback', ''),
            'next_task': reasoning.get('next_task', ''),
        }

        self.history.append({
            'timestamp': datetime.now().isoformat(),
            'result': {
                'parsed_summary': parsed.get('summary', ''),
                'findings_count': len(parsed.get('findings', [])),
                'next_task': reasoning.get('next_task', ''),
                'commands_count': len(generated.get('commands', [])),
            }
        })

        return result

    def get_initial_plan(self) -> dict:
        """Generate initial pentest plan for the target."""
        prompt = INITIAL_PLAN_PROMPT.format(target=self.target)

        self.llm.clear_history()
        try:
            response = self.llm.chat(
                prompt,
                system_prompt=REASONING_SYSTEM_PROMPT,
                temperature=0.3,
                max_tokens=1024,
            )
        except Exception as e:
            return {
                'tasks': [],
                'first_action': f"Error: {e}",
                'reasoning': str(e),
            }

        # Parse TASKS
        tasks = []
        for m in re.finditer(
            r'(\d+)\.\s*(\w+)\s*\|\s*(\d)\s*\|\s*(.+)',
            response
        ):
            ntype_str = m.group(2).strip()
            ntype = self.reasoner._map_node_type(ntype_str)
            tasks.append({
                'node_type': ntype,
                'priority': int(m.group(3)),
                'label': m.group(4).strip(),
            })

        # Add tasks to tree under appropriate branches
        for task in tasks:
            # Find matching root branch
            parent_id = None
            for root_id in self.tree.root_nodes:
                root = self.tree.get_node(root_id)
                if root and root.node_type == task['node_type']:
                    parent_id = root_id
                    break
            self.tree.add_node(
                label=task['label'],
                node_type=task['node_type'],
                parent_id=parent_id,
                priority=task['priority'],
            )

        # Parse first action
        first_action = ""
        m = re.search(r'FIRST_ACTION:\s*(.+)', response, re.IGNORECASE)
        if m:
            first_action = m.group(1).strip()

        reasoning = ""
        m = re.search(r'REASONING:\s*(.+)', response, re.IGNORECASE)
        if m:
            reasoning = m.group(1).strip()

        # Generate commands for first action
        commands = []
        if first_action:
            gen = self.generator.generate(first_action, self.target)
            commands = gen.get('commands', [])

        return {
            'tasks': tasks,
            'first_action': first_action,
            'reasoning': reasoning,
            'commands': commands,
        }

    def inject_information(self, info: str, source: str = "manual") -> dict:
        """Inject external information and get updated recommendations."""
        parsed = {
            'summary': info[:200],
            'findings': [info],
            'status': 'success',
            'raw_source': source,
        }
        return self.process_output(info, source_type=source)

    def discuss(self, question: str) -> str:
        """Ad-hoc question that doesn't affect the tree."""
        tree_summary = self.tree.render_summary()
        prompt = DISCUSS_SYSTEM_PROMPT.format(
            target=self.target,
            tree_summary=tree_summary,
        )
        self.llm.clear_history()
        try:
            return self.llm.chat(
                question,
                system_prompt=prompt,
                temperature=0.5,
                max_tokens=1024,
            )
        except Exception as e:
            return f"Error: {e}"