"""Web page generator for Rocky Man."""

import gzip
import json
import logging
from pathlib import Path
from typing import List, Dict, Any

from jinja2 import Environment, FileSystemLoader, select_autoescape

from ..models import ManFile

logger = logging.getLogger(__name__)


class WebGenerator:
    """Generates web pages and search index for Rocky Man.

    Handles:
    - Generating index/search page
    - Wrapping man page HTML in templates
    - Creating search index JSON
    """

    def __init__(self, template_dir: Path, output_dir: Path):
        """Initialize web generator.

        Args:
            template_dir: Directory containing Jinja2 templates
            output_dir: Directory for HTML output
        """
        self.template_dir = Path(template_dir)
        self.output_dir = Path(output_dir)
        self.output_dir.mkdir(parents=True, exist_ok=True)

        # Setup Jinja2 environment
        self.env = Environment(
            loader=FileSystemLoader(str(self.template_dir)),
            autoescape=select_autoescape(['html', 'xml'])
        )

    def generate_manpage_html(self, man_file: ManFile, version: str) -> bool:
        """Generate complete HTML page for a man page.

        Args:
            man_file: ManFile with html_content already set
            version: Rocky Linux version

        Returns:
            True if successful
        """
        if not man_file.html_content:
            logger.warning(f"No HTML content for {man_file.display_name}")
            return False

        try:
            template = self.env.get_template('manpage.html')

            html = template.render(
                title=f"{man_file.display_name} - {man_file.package_name} - Rocky Linux {version}",
                header_title=man_file.display_name,
                package_name=man_file.package_name,
                version=version,
                section=man_file.section,
                language=man_file.language or 'en',
                content=man_file.html_content
            )

            # Ensure output path is set
            if not man_file.html_path:
                man_file.html_path = self._get_manpage_path(man_file, version)

            man_file.html_path.parent.mkdir(parents=True, exist_ok=True)

            with open(man_file.html_path, 'w', encoding='utf-8') as f:
                f.write(html)

            return True

        except Exception as e:
            logger.error(f"Error generating HTML for {man_file.display_name}: {e}")
            return False

    def generate_index(self, version: str, search_data: Dict[str, Any]) -> bool:
        """Generate search/index page for a version.

        Args:
            version: Rocky Linux version
            search_data: Search index data

        Returns:
            True if successful
        """
        try:
            template = self.env.get_template('index.html')

            html = template.render(
                title=f"Rocky Linux {version} Man Pages",
                version=version,
                total_pages=len(search_data),
                packages=sorted(search_data.keys())
            )

            index_path = self.output_dir / version / 'index.html'
            index_path.parent.mkdir(parents=True, exist_ok=True)

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

            logger.info(f"Generated index for version {version}")
            return True

        except Exception as e:
            logger.error(f"Error generating index for {version}: {e}")
            return False
    
    def generate_packages_index(self, version: str, search_data: Dict[str, Any]) -> bool:
        """Generate full packages index page.

        Args:
            version: Rocky Linux version
            search_data: Search index data

        Returns:
            True if successful
        """
        try:
            # Group packages by first letter
            packages_by_letter = {}
            
            for pkg_name, pages in search_data.items():
                first_char = pkg_name[0].upper()
                if not first_char.isalpha():
                    first_char = 'other'
                
                if first_char not in packages_by_letter:
                    packages_by_letter[first_char] = []
                
                packages_by_letter[first_char].append({
                    'name': pkg_name,
                    'count': len(pages)
                })

            # Sort packages within each letter
            for letter in packages_by_letter:
                packages_by_letter[letter].sort(key=lambda x: x['name'])

            template = self.env.get_template('packages.html')

            html = template.render(
                title=f"All Packages - Rocky Linux {version}",
                version=version,
                total_packages=len(search_data),
                packages_by_letter=packages_by_letter
            )

            output_path = self.output_dir / version / 'packages.html'
            output_path.parent.mkdir(parents=True, exist_ok=True)

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

            logger.info(f"Generated packages index for version {version}")
            return True

        except Exception as e:
            logger.error(f"Error generating packages index for {version}: {e}")
            return False

    def generate_search_index(
        self,
        man_files: List[ManFile],
        version: str
    ) -> Dict[str, Any]:
        """Generate search index from man files.

        Args:
            man_files: List of ManFile objects
            version: Rocky Linux version

        Returns:
            Search index dictionary
        """
        index = {}

        for man_file in man_files:
            pkg_name = man_file.package_name

            if pkg_name not in index:
                index[pkg_name] = {}

            # Create entry for this man page
            entry = {
                'name': man_file.name,
                'section': man_file.section,
                'display_name': man_file.display_name,
                'language': man_file.language or 'en',
                'url': man_file.uri_path,
                'full_name': f"{man_file.package_name} - {man_file.display_name}"
            }

            # Use display name as key (handles duplicates with different sections)
            key = man_file.display_name
            if man_file.language:
                key = f"{key}.{man_file.language}"

            index[pkg_name][key] = entry

        return index

    def save_search_index(self, index: Dict[str, Any], version: str) -> bool:
        """Save search index as JSON (both plain and gzipped).

        Args:
            index: Search index dictionary
            version: Rocky Linux version

        Returns:
            True if successful
        """
        try:
            version_dir = self.output_dir / version
            version_dir.mkdir(parents=True, exist_ok=True)

            json_path = version_dir / 'search.json'
            gz_path = version_dir / 'search.json.gz'

            # Sort for consistency
            sorted_index = {k: index[k] for k in sorted(index)}

            # Save plain JSON
            with open(json_path, 'w', encoding='utf-8') as f:
                json.dump(sorted_index, f, indent=2)

            # Save gzipped JSON
            with gzip.open(gz_path, 'wt', encoding='utf-8') as f:
                json.dump(sorted_index, f)

            logger.info(f"Saved search index for {version} ({len(index)} packages)")
            return True

        except Exception as e:
            logger.error(f"Error saving search index: {e}")
            return False

    def _get_manpage_path(self, man_file: ManFile, version: str) -> Path:
        """Get output path for a man page HTML file.

        Args:
            man_file: ManFile object
            version: Rocky Linux version

        Returns:
            Path for HTML file
        """
        version_dir = self.output_dir / version
        pkg_dir = version_dir / man_file.package_name
        section_dir = pkg_dir / f"man{man_file.section}"

        return section_dir / man_file.html_filename

    def generate_root_index(self, versions: List[str]) -> bool:
        """Generate root index page linking to all versions.

        Args:
            versions: List of Rocky Linux versions

        Returns:
            True if successful
        """
        try:
            template = self.env.get_template('root.html')

            # Sort versions numerically (e.g., 8.10, 9.6, 10.0)
            def version_key(v):
                try:
                    parts = v.split('.')
                    return tuple(int(p) for p in parts)
                except (ValueError, AttributeError):
                    return (0, 0)

            html = template.render(
                title="Rocky Linux Man Pages",
                versions=sorted(versions, key=version_key)
            )

            index_path = self.output_dir / 'index.html'

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

            logger.info("Generated root index page")
            return True

        except Exception as e:
            logger.error(f"Error generating root index: {e}")
            return False