"""
Claude Code Bridge - Interface between DevLoop and Claude Code execution.

Handles:
- Translating Gemini plans into Claude Code instructions
- Executing code changes through OpenCode extension or CLI
- Capturing implementation results
"""

import asyncio
import json
import logging
import os
import subprocess
from dataclasses import dataclass
from datetime import datetime
from pathlib import Path
from typing import Any, Dict, List, Optional

logger = logging.getLogger(__name__)


@dataclass
class ImplementationResult:
    """Result of a Claude Code implementation."""

    status: str  # "success", "partial", "error"
    files_modified: List[str]
    warnings: List[str]
    errors: List[str]
    duration_seconds: float


class ClaudeCodeBridge:
    """
    Bridge between Gemini plans and Claude Code execution.

    Supports multiple execution modes:
    - CLI: Direct Claude Code CLI invocation
    - API: Anthropic API for code generation (if API key available)
    - Manual: Generate instructions for human execution
    """

    def __init__(self, config: Optional[Dict] = None):
        """
        Initialize the bridge.

        Args:
            config: Configuration with execution mode and API settings
        """
        self.config = config or {}
        self.workspace = Path(self.config.get("workspace", "C:/Users/antoi/Atomizer"))
        self.execution_mode = self.config.get("mode", "cli")
        self._client = None

    @property
    def client(self):
        """Lazy-load Anthropic client if API mode."""
        if self._client is None and self.execution_mode == "api":
            try:
                import anthropic

                api_key = self.config.get("api_key") or os.environ.get("ANTHROPIC_API_KEY")
                if api_key:
                    self._client = anthropic.Anthropic(api_key=api_key)
                    logger.info("Anthropic client initialized")
            except ImportError:
                logger.warning("anthropic package not installed")
        return self._client

    def create_implementation_session(self, plan: Dict) -> str:
        """
        Generate Claude Code instruction from Gemini plan.

        Args:
            plan: Plan dict from GeminiPlanner

        Returns:
            Formatted instruction string for Claude Code
        """
        objective = plan.get("objective", "Unknown objective")
        approach = plan.get("approach", "")
        tasks = plan.get("tasks", [])
        acceptance_criteria = plan.get("acceptance_criteria", [])

        instruction = f"""## Implementation Task: {objective}

### Approach
{approach}

### Tasks to Complete
"""

        for i, task in enumerate(tasks, 1):
            instruction += f"""
{i}. **{task.get("description", "Task")}**
   - File: `{task.get("file", "TBD")}`
   - Priority: {task.get("priority", "medium")}
"""
            if task.get("code_hint"):
                instruction += f"   - Hint: {task.get('code_hint')}\n"
            if task.get("dependencies"):
                instruction += f"   - Depends on: {', '.join(task['dependencies'])}\n"

        instruction += """
### Acceptance Criteria
"""
        for criterion in acceptance_criteria:
            instruction += f"- [ ] {criterion}\n"

        instruction += """
### Constraints
- Maintain existing API contracts
- Follow Atomizer coding standards
- Ensure AtomizerSpec v2.0 compatibility
- Create README.md for any new study
- Use existing extractors from SYS_12 when possible
"""

        return instruction

    async def execute_plan(self, plan: Dict) -> Dict:
        """
        Execute an implementation plan.

        Args:
            plan: Plan dict from GeminiPlanner

        Returns:
            Implementation result dict
        """
        instruction = self.create_implementation_session(plan)

        if self.execution_mode == "cli":
            return await self._execute_via_cli(instruction, plan)
        elif self.execution_mode == "api":
            return await self._execute_via_api(instruction, plan)
        else:
            return await self._execute_manual(instruction, plan)

    async def _execute_via_cli(self, instruction: str, plan: Dict) -> Dict:
        """Execute through Claude Code CLI."""
        start_time = datetime.now()

        # Write instruction to temp file
        instruction_file = self.workspace / ".devloop_instruction.md"
        instruction_file.write_text(instruction)

        files_modified = []
        warnings = []
        errors = []

        try:
            # Try to invoke Claude Code CLI
            # Note: This assumes claude-code or similar CLI is available
            result = subprocess.run(
                [
                    "powershell",
                    "-Command",
                    f"cd {self.workspace}; claude --print '{instruction_file}'",
                ],
                capture_output=True,
                text=True,
                timeout=300,  # 5 minute timeout
                cwd=str(self.workspace),
            )

            if result.returncode == 0:
                # Parse output for modified files
                output = result.stdout
                for line in output.split("\n"):
                    if "Modified:" in line or "Created:" in line:
                        parts = line.split(":", 1)
                        if len(parts) > 1:
                            files_modified.append(parts[1].strip())

                status = "success"
            else:
                errors.append(result.stderr or "CLI execution failed")
                status = "error"

        except subprocess.TimeoutExpired:
            errors.append("CLI execution timed out after 5 minutes")
            status = "error"
        except FileNotFoundError:
            # Claude CLI not found, fall back to manual mode
            logger.warning("Claude CLI not found, switching to manual mode")
            return await self._execute_manual(instruction, plan)
        except Exception as e:
            errors.append(str(e))
            status = "error"
        finally:
            # Clean up temp file
            if instruction_file.exists():
                instruction_file.unlink()

        duration = (datetime.now() - start_time).total_seconds()

        return {
            "status": status,
            "files": files_modified,
            "warnings": warnings,
            "errors": errors,
            "duration_seconds": duration,
        }

    async def _execute_via_api(self, instruction: str, plan: Dict) -> Dict:
        """Execute through Anthropic API for code generation."""
        if not self.client:
            return await self._execute_manual(instruction, plan)

        start_time = datetime.now()
        files_modified = []
        warnings = []
        errors = []

        try:
            # Use Claude API for code generation
            response = self.client.messages.create(
                model="claude-sonnet-4-20250514",
                max_tokens=8192,
                messages=[
                    {
                        "role": "user",
                        "content": f"""You are implementing code for the Atomizer FEA optimization framework.

{instruction}

For each file that needs to be created or modified, output the complete file content in this format:

### FILE: path/to/file.py
```python
# file content here
```

Be thorough and implement all tasks completely.
""",
                    }
                ],
            )

            # Parse response for file contents
            content = response.content[0].text

            # Extract files from response
            import re

            file_pattern = r"### FILE: (.+?)\n```\w*\n(.*?)```"
            matches = re.findall(file_pattern, content, re.DOTALL)

            for file_path, file_content in matches:
                try:
                    full_path = self.workspace / file_path.strip()
                    full_path.parent.mkdir(parents=True, exist_ok=True)
                    full_path.write_text(file_content.strip())
                    files_modified.append(str(file_path.strip()))
                    logger.info(f"Created/modified: {file_path}")
                except Exception as e:
                    errors.append(f"Failed to write {file_path}: {e}")

            status = "success" if files_modified else "partial"

        except Exception as e:
            errors.append(str(e))
            status = "error"

        duration = (datetime.now() - start_time).total_seconds()

        return {
            "status": status,
            "files": files_modified,
            "warnings": warnings,
            "errors": errors,
            "duration_seconds": duration,
        }

    async def _execute_manual(self, instruction: str, plan: Dict) -> Dict:
        """
        Generate manual instructions (when automation not available).

        Saves instruction to file for human execution.
        """
        start_time = datetime.now()

        # Save instruction for manual execution
        output_file = self.workspace / ".devloop" / "pending_instruction.md"
        output_file.parent.mkdir(parents=True, exist_ok=True)
        output_file.write_text(instruction)

        logger.info(f"Manual instruction saved to: {output_file}")

        return {
            "status": "pending_manual",
            "instruction_file": str(output_file),
            "files": [],
            "warnings": ["Automated execution not available. Please execute manually."],
            "errors": [],
            "duration_seconds": (datetime.now() - start_time).total_seconds(),
        }

    async def execute_fix(self, fix_plan: Dict) -> Dict:
        """
        Execute a specific fix from analysis.

        Args:
            fix_plan: Fix plan dict from ProblemAnalyzer

        Returns:
            Fix result dict
        """
        issue_id = fix_plan.get("issue_id", "unknown")
        approach = fix_plan.get("approach", "")
        steps = fix_plan.get("steps", [])

        instruction = f"""## Bug Fix: {issue_id}

### Approach
{approach}

### Steps
"""
        for i, step in enumerate(steps, 1):
            instruction += f"{i}. {step.get('description', step.get('action', 'Step'))}\n"
            if step.get("file"):
                instruction += f"   File: `{step['file']}`\n"

        instruction += """
### Verification
After implementing the fix, verify that:
1. The specific test case passes
2. No regressions are introduced
3. Code follows Atomizer patterns
"""

        # Execute as a mini-plan
        return await self.execute_plan(
            {
                "objective": f"Fix: {issue_id}",
                "approach": approach,
                "tasks": [
                    {
                        "description": step.get("description", step.get("action")),
                        "file": step.get("file"),
                        "priority": "high",
                    }
                    for step in steps
                ],
                "acceptance_criteria": [
                    "Original test passes",
                    "No new errors introduced",
                ],
            }
        )

    def get_execution_status(self) -> Dict:
        """Get current execution status."""
        pending_file = self.workspace / ".devloop" / "pending_instruction.md"

        return {
            "mode": self.execution_mode,
            "workspace": str(self.workspace),
            "has_pending_instruction": pending_file.exists(),
            "api_available": self.client is not None,
        }

    async def verify_implementation(self, expected_files: List[str]) -> Dict:
        """
        Verify that implementation created expected files.

        Args:
            expected_files: List of file paths that should exist

        Returns:
            Verification result
        """
        missing = []
        found = []

        for file_path in expected_files:
            path = (
                self.workspace / file_path if not Path(file_path).is_absolute() else Path(file_path)
            )
            if path.exists():
                found.append(str(file_path))
            else:
                missing.append(str(file_path))

        return {
            "complete": len(missing) == 0,
            "found": found,
            "missing": missing,
        }