"""
Export Utilities - Handle various export formats
"""
import json
import csv
import io
from typing import Dict, List
from datetime import datetime


def save_json_file(data: Dict, prefix: str = "export") -> str:
    """
    Save data to JSON file and return filepath.

    Args:
        data: Data to save
        prefix: Filename prefix

    Returns:
        Path to saved file
    """
    timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
    filename = f"{prefix}_{timestamp}.json"

    with open(filename, 'w', encoding='utf-8') as f:
        json.dump(data, f, indent=2, ensure_ascii=False)

    return filename


def survey_to_csv(survey_data: Dict) -> str:
    """
    Convert survey to CSV format (one row per question).

    Args:
        survey_data: Survey dictionary

    Returns:
        Path to CSV file
    """
    timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
    filename = f"survey_{timestamp}.csv"

    with open(filename, 'w', newline='', encoding='utf-8') as f:
        writer = csv.writer(f)

        # Write header
        writer.writerow(['Question ID', 'Question Text', 'Type', 'Options', 'Required', 'Help Text'])

        # Write questions
        for q in survey_data.get('questions', []):
            writer.writerow([
                q.get('id', ''),
                q.get('question_text', ''),
                q.get('question_type', ''),
                '; '.join(q.get('options', [])) if q.get('options') else '',
                'Yes' if q.get('required', False) else 'No',
                q.get('help_text', '')
            ])

    return filename


def responses_to_csv(responses: List[Dict], filename_prefix: str = "responses") -> str:
    """
    Convert responses to CSV format.

    Args:
        responses: List of response dictionaries
        filename_prefix: Prefix for filename

    Returns:
        Path to CSV file
    """
    if not responses:
        return None

    timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
    filename = f"{filename_prefix}_{timestamp}.csv"

    # Get all unique keys from all responses
    all_keys = set()
    for response in responses:
        if isinstance(response, dict):
            all_keys.update(response.keys())

    fieldnames = sorted(all_keys)

    with open(filename, 'w', newline='', encoding='utf-8') as f:
        writer = csv.DictWriter(f, fieldnames=fieldnames)
        writer.writeheader()

        for response in responses:
            if isinstance(response, dict):
                writer.writerow(response)

    return filename


def analysis_to_markdown_file(analysis_report: str, prefix: str = "analysis_report") -> str:
    """
    Save analysis report to markdown file.

    Args:
        analysis_report: Markdown formatted report
        prefix: Filename prefix

    Returns:
        Path to markdown file
    """
    timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
    filename = f"{prefix}_{timestamp}.md"

    with open(filename, 'w', encoding='utf-8') as f:
        f.write(analysis_report)

    return filename


def create_survey_package(survey_data: Dict) -> Dict[str, str]:
    """
    Create a complete package of survey files (JSON, CSV, etc.).

    Args:
        survey_data: Survey dictionary

    Returns:
        Dictionary mapping format to filepath
    """
    package = {}

    # Save JSON
    package['json'] = save_json_file(survey_data, "survey")

    # Save CSV
    package['csv'] = survey_to_csv(survey_data)

    return package


def conversation_to_transcript(conversation_session) -> str:
    """
    Export conversation session as readable text transcript.

    Args:
        conversation_session: ConversationSession object

    Returns:
        Path to transcript file
    """
    transcript = conversation_session.get_transcript()

    timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
    filename = f"conversation_transcript_{timestamp}.txt"

    with open(filename, 'w', encoding='utf-8') as f:
        f.write(transcript)

    return filename


def conversation_to_json(conversation_session) -> str:
    """
    Export conversation session as JSON.

    Args:
        conversation_session: ConversationSession object

    Returns:
        Path to JSON file
    """
    return save_json_file(conversation_session.to_dict(), "conversation_session")


def conversation_to_csv(conversation_session) -> str:
    """
    Export conversation turns as CSV.

    Args:
        conversation_session: ConversationSession object

    Returns:
        Path to CSV file
    """
    timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
    filename = f"conversation_{timestamp}.csv"

    with open(filename, 'w', newline='', encoding='utf-8') as f:
        writer = csv.writer(f)

        # Write header
        writer.writerow(['Turn', 'Speaker', 'Timestamp', 'Content', 'Node ID', 'Summary'])

        # Write turns
        for i, turn in enumerate(conversation_session.conversation_history, 1):
            speaker = "AI Moderator" if turn.role == "ai" else "Respondent"
            writer.writerow([
                i,
                speaker,
                turn.timestamp,
                turn.content,
                turn.node_id or '',
                turn.summary or ''
            ])

    return filename


def flow_to_markdown(conversation_flow) -> str:
    """
    Export conversation flow as markdown document.

    Args:
        conversation_flow: ConversationFlow object

    Returns:
        Path to markdown file
    """
    lines = []
    lines.append(f"# {conversation_flow.name}\n")
    lines.append(f"**Description:** {conversation_flow.description}\n")
    lines.append(f"**Created:** {conversation_flow.created_at}")
    lines.append(f"**Updated:** {conversation_flow.updated_at}\n")
    lines.append("\n## Conversation Flow\n")

    for i, node in enumerate(conversation_flow.nodes, 1):
        lines.append(f"### Step {i}: {node.type.capitalize()}\n")
        lines.append(f"**Content:** {node.content}\n")
        if node.next:
            lines.append(f"**Next Node:** {node.next}\n")
        if node.branches:
            lines.append(f"**Branches:** {len(node.branches)}\n")
        lines.append("")

    content = "\n".join(lines)

    timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
    filename = f"conversation_flow_{timestamp}.md"

    with open(filename, 'w', encoding='utf-8') as f:
        f.write(content)

    return filename