"""Notification email compressor for terminal-friendly display."""

from typing import Any

from .notification_detector import (
    NotificationType,
    classify_notification,
    extract_notification_summary,
    is_notification_email,
)


class NotificationCompressor:
    """Compress notification emails into terminal-friendly summaries."""

    def __init__(self, mode: str = "summary"):
        """Initialize compressor.

        Args:
            mode: Compression mode - "summary", "detailed", or "off"
        """
        self.mode = mode

    def should_compress(self, envelope: dict[str, Any]) -> bool:
        """Check if email should be compressed.

        Args:
            envelope: Email envelope metadata

        Returns:
            True if email should be compressed
        """
        if self.mode == "off":
            return False

        return is_notification_email(envelope)

    def compress(
        self, content: str, envelope: dict[str, Any]
    ) -> tuple[str, NotificationType | None]:
        """Compress notification email content.

        Args:
            content: Raw email content
            envelope: Email envelope metadata

        Returns:
            Tuple of (compressed content, notification_type)
        """

        if not self.should_compress(envelope):
            return content, None

        # Classify notification type
        notif_type = classify_notification(envelope, content)

        # Extract summary
        summary = extract_notification_summary(content, notif_type)

        # Format as markdown
        compressed = self._format_as_markdown(summary, envelope, notif_type)

        return compressed, notif_type

    def _format_as_markdown(
        self,
        summary: dict[str, Any],
        envelope: dict[str, Any],
        notif_type: NotificationType | None,
    ) -> str:
        """Format summary as markdown for terminal display.

        Args:
            summary: Extracted summary data
            envelope: Email envelope metadata
            notif_type: Classified notification type

        Returns:
            Markdown-formatted compressed email
        """

        from_addr = envelope.get("from", {}).get("name") or envelope.get(
            "from", {}
        ).get("addr", "")
        subject = envelope.get("subject", "")

        # Get icon
        icon = notif_type.icon if notif_type else "\uf0f3"

        # Build markdown
        lines = []

        # Header with icon
        if notif_type:
            lines.append(f"## {icon} {notif_type.name.title()} Notification")
        else:
            lines.append(f"## {icon} Notification")

        lines.append("")

        # Title/subject
        if summary.get("title"):
            lines.append(f"**{summary['title']}**")
        else:
            lines.append(f"**{subject}**")
        lines.append("")

        # Metadata section
        if summary.get("metadata"):
            lines.append("### Details")
            for key, value in summary["metadata"].items():
                # Format key nicely
                key_formatted = key.replace("_", " ").title()
                lines.append(f"- **{key_formatted}**: {value}")
            lines.append("")

        # Action items
        if summary.get("action_items"):
            lines.append("### Actions")
            for i, action in enumerate(summary["action_items"], 1):
                lines.append(f"{i}. {action}")
            lines.append("")

        # Add footer
        lines.append("---")
        lines.append("")
        lines.append(f"*From: {from_addr}*")
        lines.append(
            "*This is a compressed notification view. Press `m` to toggle full view.*"
        )

        return "\n".join(lines)


class DetailedCompressor(NotificationCompressor):
    """Compressor that includes more detail in summaries."""

    def _format_as_markdown(
        self,
        summary: dict[str, Any],
        envelope: dict[str, Any],
        notif_type: NotificationType | None,
    ) -> str:
        """Format summary with more detail."""

        from_addr = envelope.get("from", {}).get("name") or envelope.get(
            "from", {}
        ).get("addr", "")
        subject = envelope.get("subject", "")
        date = envelope.get("date", "")

        icon = notif_type.icon if notif_type else "\uf0f3"

        lines = []

        # Header
        lines.append(
            f"## {icon} {notif_type.name.title()} Notification"
            if notif_type
            else f"## {icon} Notification"
        )
        lines.append("")

        # Subject and from
        lines.append(f"**Subject:** {subject}")
        lines.append(f"**From:** {from_addr}")
        lines.append(f"**Date:** {date}")
        lines.append("")

        # Summary title
        if summary.get("title"):
            lines.append(f"### {summary['title']}")
            lines.append("")

        # Metadata table
        if summary.get("metadata"):
            lines.append("| Property | Value |")
            lines.append("|----------|-------|")
            for key, value in summary["metadata"].items():
                key_formatted = key.replace("_", " ").title()
                lines.append(f"| {key_formatted} | {value} |")
            lines.append("")

        # Action items
        if summary.get("action_items"):
            lines.append("### Action Items")
            for i, action in enumerate(summary["action_items"], 1):
                lines.append(f"- [ ] {action}")
            lines.append("")

        # Key links
        if summary.get("key_links"):
            lines.append("### Important Links")
            for link in summary["key_links"]:
                lines.append(f"- [{link.get('text', 'Link')}]({link.get('url', '#')})")
            lines.append("")

        # Footer
        lines.append("---")
        lines.append(
            "*This is a compressed notification view. Press `m` to toggle full view.*"
        )

        return "\n".join(lines)


def create_compressor(mode: str) -> NotificationCompressor:
    """Factory function to create appropriate compressor.

    Args:
        mode: Compression mode - "summary", "detailed", or "off"

    Returns:
        NotificationCompressor instance
    """

    if mode == "detailed":
        return DetailedCompressor(mode=mode)
    return NotificationCompressor(mode=mode)