#!/usr/bin/env python3
"""
Support data analysis tool for Infix

Analyze support data collected from Infix devices. Provides TUI for exploring
logs, comparing between devices or time periods, and generating summaries.

Installation:
    This tool requires Python 3.10+ and the 'textual' library.

    Option 1: Using a virtual environment (recommended):
        python3 -m venv ~/.venv/support
        source ~/.venv/support/bin/activate
        pip install textual rich
        ./support analyze ~/support/

        # To use later, just activate the venv again:
        source ~/.venv/support/bin/activate

    Option 2: Using uvx (if you have uv installed):
        uvx --from textual --with rich ./support analyze ~/support/

    Option 3: System-wide installation:
        pip install --user textual rich
        ./support analyze ~/support/

    Note: System packages (apt-get/apt) often have outdated versions.
          Use pip with venv for the latest textual version.

Usage:
    support analyze <directory>           # Single device TUI browser
    support analyze <dir1> <dir2>         # Comparison view (auto-detect)
    support diff <dir1> <dir2> [--file]   # Focused diff view
    support summary <directory...>        # Quick CLI summary
"""

import argparse
import sys
from pathlib import Path


class SupportArchive:
    """Represents a single support collection directory."""

    def __init__(self, path: Path):
        self.path = path
        self.name = path.name

        # Parse directory name: support-<hostname>-<timestamp>
        # e.g., support-infix-00-00-00-2025-11-30T06:40:58+00:00
        # Timestamp is ISO 8601: YYYY-MM-DDTHH:MM:SS+TZ
        # So we look for the pattern YYYY-MM-DD (last occurrence of date pattern)

        if self.name.startswith('support-'):
            remainder = self.name[8:]  # Remove 'support-' prefix

            # Find the timestamp by looking for ISO 8601 date pattern
            # Pattern: YYYY-MM-DDTHH:MM:SS
            import re
            match = re.search(r'(\d{4}-\d{2}-\d{2}T[\d:+-]+)$', remainder)

            if match:
                # Everything before the timestamp is the hostname
                timestamp_start = match.start()
                # hostname is everything up to (but not including) the last dash before timestamp
                hostname_part = remainder[:timestamp_start].rstrip('-')
                self.hostname = hostname_part
                self.timestamp = match.group(1)
            else:
                # No timestamp found
                self.hostname = remainder
                self.timestamp = None
        else:
            # Doesn't start with 'support-'
            self.hostname = self.name
            self.timestamp = None

        self.collection_log = path / "collection.log"
        self.is_valid = self.collection_log.exists()

    def get_file(self, relative_path: str) -> Path:
        """Get path to a file within the archive."""
        return self.path / relative_path

    def list_files(self, pattern: str = "*") -> list[Path]:
        """List all files matching pattern (recursive)."""
        return sorted(self.path.rglob(pattern))

    def get_structure(self) -> dict:
        """Get organized structure of collected data."""
        structure = {
            "system": [],
            "network": [],
            "frr": [],
            "podman": [],
            "config": [],
            "logs": [],
            "other": [],
        }

        for file in self.path.rglob("*"):
            if file.is_file():
                rel_path = file.relative_to(self.path)
                parts = rel_path.parts

                if len(parts) > 0:
                    category = parts[0] if parts[0] in structure else "other"
                    structure[category].append(rel_path)

        return structure

    def get_summary_data(self) -> dict:
        """Parse key files and extract summary information."""
        summary = {
            "uptime": "unknown",
            "uptime_seconds": -1,  # -1 means unknown, 0 is valid (just booted)
            "memory_percent": 0,
            "memory_used_mb": 0,
            "memory_total_mb": 0,
            "load_avg": "unknown",
            "dmesg_errors": 0,
            "dmesg_warnings": 0,
        }

        # Parse uptime
        uptime_file = self.get_file("uptime.txt")
        if uptime_file.exists():
            try:
                uptime_text = uptime_file.read_text().strip()
                # Format: " 06:41:19 up 1 min,  1 users,  load average: 0.00, 0.00, 0.00"
                summary["uptime"] = uptime_text

                # Extract load average
                if "load average:" in uptime_text:
                    load_part = uptime_text.split("load average:")[1].strip()
                    summary["load_avg"] = load_part

                # Extract uptime seconds (rough estimate from days/hours/minutes)
                import re
                if " day" in uptime_text:
                    days = int(re.search(r'(\d+)\s+day', uptime_text).group(1))
                    summary["uptime_seconds"] = days * 86400
                elif " min" in uptime_text:
                    mins = int(re.search(r'(\d+)\s+min', uptime_text).group(1))
                    summary["uptime_seconds"] = mins * 60
                elif ":" in uptime_text and "up" in uptime_text:
                    # Format like "up 1:23" (hours:minutes)
                    time_match = re.search(r'up\s+(\d+):(\d+)', uptime_text)
                    if time_match:
                        hours, mins = int(time_match.group(1)), int(time_match.group(2))
                        summary["uptime_seconds"] = hours * 3600 + mins * 60
            except:
                pass

        # Parse memory from meminfo
        meminfo_file = self.get_file("system/meminfo.txt")
        if meminfo_file.exists():
            try:
                meminfo = meminfo_file.read_text()
                mem_total = 0
                mem_available = 0

                for line in meminfo.splitlines():
                    if line.startswith("MemTotal:"):
                        mem_total = int(line.split()[1])  # in KB
                    elif line.startswith("MemAvailable:"):
                        mem_available = int(line.split()[1])  # in KB

                if mem_total > 0:
                    mem_used = mem_total - mem_available
                    summary["memory_total_mb"] = mem_total // 1024
                    summary["memory_used_mb"] = mem_used // 1024
                    summary["memory_percent"] = int((mem_used / mem_total) * 100)
            except:
                pass

        # Count errors/warnings in dmesg
        dmesg_file = self.get_file("system/dmesg.txt")
        if dmesg_file.exists():
            try:
                dmesg = dmesg_file.read_text().lower()
                # Count lines with error/warning (case insensitive)
                for line in dmesg.splitlines():
                    if 'error' in line or 'fail' in line:
                        summary["dmesg_errors"] += 1
                    elif 'warn' in line:
                        summary["dmesg_warnings"] += 1
            except:
                pass

        return summary

    def __repr__(self):
        return f"SupportArchive({self.hostname}@{self.timestamp})"


def discover_archives(directory: Path) -> list[SupportArchive]:
    """
    Discover all support collection directories in the given path.

    Handles both:
    - Direct path to a support directory
    - Parent directory containing multiple support directories
    """
    archives = []

    if not directory.exists():
        print(f"Error: Directory not found: {directory}", file=sys.stderr)
        return archives

    # Check if directory itself is a support archive
    if (directory / "collection.log").exists():
        archives.append(SupportArchive(directory))
        return archives

    # Otherwise, scan for support directories
    for item in directory.iterdir():
        if item.is_dir() and item.name.startswith("support-"):
            archive = SupportArchive(item)
            if archive.is_valid:
                archives.append(archive)
            else:
                print(f"Warning: Invalid archive (no collection.log): {item}",
                      file=sys.stderr)

    return sorted(archives, key=lambda a: (a.hostname, a.timestamp or ""))


def detect_mode(archives: list[SupportArchive]) -> str:
    """
    Auto-detect analysis mode based on archives.

    Returns:
        - "analyze": One archive (single archive browser)
        - "compare": Two archives
        - "summary": Multiple archives (fleet view)
    """
    if len(archives) == 0:
        return "summary"
    elif len(archives) == 1:
        return "analyze"  # Single archive -> analyze mode
    elif len(archives) == 2:
        return "compare"
    else:
        return "summary"  # Multiple archives -> summary/fleet view


def cmd_analyze(args):
    """Main TUI analysis command."""
    # Collect all archives from provided paths
    all_archives = []
    for path_str in args.directories:
        path = Path(path_str).resolve()
        archives = discover_archives(path)
        all_archives.extend(archives)

    if not all_archives:
        print("Error: No valid support archives found", file=sys.stderr)
        return 1

    # Auto-detect or use explicit mode
    mode = args.mode or detect_mode(all_archives)

    # Launch TUI
    try:
        from support_tui import launch_tui
        launch_tui(all_archives, mode)
        return 0
    except ImportError as e:
        print(f"Error: TUI dependencies not available: {e}", file=sys.stderr)
        print("Please install: pip install textual", file=sys.stderr)
        return 1
    except Exception as e:
        print(f"Error launching TUI: {e}", file=sys.stderr)
        return 1


def cmd_diff(args):
    """Diff command for comparing two archives."""
    dir1 = Path(args.dir1).resolve()
    dir2 = Path(args.dir2).resolve()

    archives1 = discover_archives(dir1)
    archives2 = discover_archives(dir2)

    if not archives1 or not archives2:
        print("Error: Could not find valid archives in provided paths",
              file=sys.stderr)
        return 1

    archive1 = archives1[0]
    archive2 = archives2[0]

    print(f"Comparing:")
    print(f"  {archive1.name}")
    print(f"  {archive2.name}")

    if args.file:
        print(f"\nFile: {args.file}")

    print("\nDiff view not yet implemented - coming next!")

    # TODO: Launch diff TUI
    return 0


def cmd_summary(args):
    """Generate quick summary of archives."""
    for path_str in args.directories:
        path = Path(path_str).resolve()
        archives = discover_archives(path)

        for archive in archives:
            print(f"\n{archive.hostname} @ {archive.timestamp or 'unknown'}")
            print("─" * 60)

            # Try to read some basic info
            hostname_file = archive.get_file("hostname.txt")
            if hostname_file.exists():
                hostname = hostname_file.read_text().strip()
                print(f"Hostname: {hostname}")

            uptime_file = archive.get_file("uptime.txt")
            if uptime_file.exists():
                uptime = uptime_file.read_text().strip()
                print(f"Uptime: {uptime}")

            # Show structure
            structure = archive.get_structure()
            print("\nCollected data:")
            for category, files in structure.items():
                if files:
                    print(f"  {category}: {len(files)} files")

    return 0


def main():
    # Special handling: if no args or first arg doesn't look like a command, treat as TUI launch
    if len(sys.argv) > 1 and sys.argv[1] not in ['analyze', 'diff', 'summary', '-h', '--help']:
        # Looks like directories were provided without a command - launch TUI
        all_archives = []
        for path_str in sys.argv[1:]:
            if path_str.startswith('-'):
                print(f"Error: Unknown option: {path_str}", file=sys.stderr)
                print("Usage: support <directory> [directory...]", file=sys.stderr)
                print("   or: support <command> [options]", file=sys.stderr)
                return 1
            path = Path(path_str).resolve()
            archives = discover_archives(path)
            all_archives.extend(archives)

        if not all_archives:
            print("Error: No valid support archives found", file=sys.stderr)
            return 1

        # Launch TUI with summary as default
        try:
            from support_tui import launch_tui
            launch_tui(all_archives, mode="summary")
            return 0
        except ImportError as e:
            print(f"Error: TUI dependencies not available: {e}", file=sys.stderr)
            print("Please install: pip install textual rich", file=sys.stderr)
            return 1
        except Exception as e:
            print(f"Error launching TUI: {e}", file=sys.stderr)
            import traceback
            traceback.print_exc()
            return 1

    # Otherwise, parse as normal with subcommands
    parser = argparse.ArgumentParser(
        description="Analyze support data from Infix devices",
        formatter_class=argparse.RawDescriptionHelpFormatter,
        epilog="""
Examples:
  %(prog)s ~/support/                            # Launch TUI (default: summary view)
  %(prog)s ~/support/support-router1-*           # Launch TUI with specific archives
  %(prog)s analyze ~/support/ --mode compare     # Force compare mode
  %(prog)s diff archive1/ archive2/
  %(prog)s summary ~/support/
        """
    )

    subparsers = parser.add_subparsers(dest="command", required=True)

    # analyze command
    analyze_parser = subparsers.add_parser(
        "analyze",
        help="Interactive TUI for exploring support data"
    )
    analyze_parser.add_argument(
        "directories",
        nargs="+",
        help="Support archive directories to analyze"
    )
    analyze_parser.add_argument(
        "--mode",
        choices=["analyze", "compare", "summary"],
        help="Force specific analysis mode (auto-detected by default)"
    )

    # diff command
    diff_parser = subparsers.add_parser(
        "diff",
        help="Compare two support archives"
    )
    diff_parser.add_argument("dir1", help="First archive directory")
    diff_parser.add_argument("dir2", help="Second archive directory")
    diff_parser.add_argument(
        "--file",
        help="Specific file to compare (relative path within archive)"
    )

    # summary command
    summary_parser = subparsers.add_parser(
        "summary",
        help="Generate quick text summary of archive(s)"
    )
    summary_parser.add_argument(
        "directories",
        nargs="+",
        help="Support archive directories to summarize"
    )

    args = parser.parse_args()

    # Dispatch to appropriate command handler
    if args.command == "analyze":
        return cmd_analyze(args)
    elif args.command == "diff":
        return cmd_diff(args)
    elif args.command == "summary":
        return cmd_summary(args)
    else:
        parser.print_help()
        return 1


if __name__ == "__main__":
    sys.exit(main())