# pylint: disable=too-many-branches
# pylint: disable=too-many-nested-blocks

import itertools
import os
import os.path
import tempfile
import subprocess
import json
from datetime import datetime
from typing import Dict, List, Any, Optional

from osbuild.solver import (
    DepsolveError,
    MarkingError,
    NoReposError,
    RepoError,
    SolverBase,
    modify_rootdir_path,
    read_keys,
)


class APT(SolverBase):
    def __init__(self, request, persistdir, cache_dir, license_index_path=None):
        arch = request["arch"]
        releasever = request.get("releasever")
        proxy = request.get("proxy")

        arguments = request["arguments"]
        repos = arguments.get("repos", [])
        root_dir = arguments.get("root_dir")

        self.arch = arch
        self.releasever = releasever
        self.root_dir = root_dir
        self.cache_dir = cache_dir
        self.persistdir = persistdir
        self.proxy = proxy

        # APT configuration
        self.apt_config = {
            "APT::Architecture": arch,
            "APT::Default-Release": releasever or "trixie",
            "APT::Get::Assume-Yes": "true",
            "APT::Get::AllowUnauthenticated": "false",
            "APT::Get::Fix-Broken": "true",
            "APT::Get::Show-Upgraded": "true",
            "APT::Get::Show-User-Simulation-Note": "false",
            "APT::Install-Recommends": "false",
            "APT::Install-Suggests": "false",
            "APT::Cache::ShowFull": "true",
            "Dir::Etc::Trusted": "/etc/apt/trusted.gpg",
            "Dir::Etc::TrustedParts": "/etc/apt/trusted.gpg.d/",
        }

        # Set up proxy if provided
        if proxy:
            self.apt_config.update({
                "Acquire::http::Proxy": proxy,
                "Acquire::https::Proxy": proxy,
                "Acquire::ftp::Proxy": proxy,
            })

        # Repository configuration
        self.repos = []
        for repo in repos:
            self._add_repository(repo)

        if not self.repos:
            raise NoReposError("No repositories configured")

    def _add_repository(self, repo_config):
        """Add a repository to the APT configuration."""
        repo = {
            "name": repo_config.get("name", "unknown"),
            "baseurl": repo_config.get("baseurl", ""),
            "enabled": repo_config.get("enabled", True),
            "gpgcheck": repo_config.get("gpgcheck", True),
            "gpgkey": repo_config.get("gpgkey", []),
            "priority": repo_config.get("priority", 500),
            "components": repo_config.get("components", ["main"]),
            "architectures": repo_config.get("architectures", [self.arch]),
        }

        if not repo["baseurl"]:
            raise RepoError(f"Repository {repo['name']} has no baseurl")

        # Add GPG keys if specified
        if repo["gpgcheck"] and repo["gpgkey"]:
            try:
                keys = read_keys(repo["gpgkey"], self.root_dir)
                # In a real implementation, we would add these keys to the keyring
                # For now, we'll just validate they exist
                for key in keys:
                    if not key.strip():
                        raise RepoError(f"Empty GPG key for repository {repo['name']}")
            except Exception as e:
                raise RepoError(f"Failed to read GPG keys for repository {repo['name']}: {e}") from e

        self.repos.append(repo)

    def _run_apt_command(self, command, args=None, env=None):
        """Run an APT command with proper configuration."""
        if args is None:
            args = []

        # Set up environment
        cmd_env = os.environ.copy()
        if env:
            cmd_env.update(env)

        # Add APT configuration
        apt_opts = []
        for key, value in self.apt_config.items():
            apt_opts.extend(["-o", f"{key}={value}"])

        # Add root directory if specified
        if self.root_dir:
            apt_opts.extend(["-o", f"Dir={self.root_dir}"])

        # Build command
        full_command = ["apt-get"] + apt_opts + [command] + args

        try:
            result = subprocess.run(
                full_command,
                capture_output=True,
                text=True,
                check=True,
                env=cmd_env,
                cwd=self.root_dir or "/"
            )
            return result
        except subprocess.CalledProcessError as e:
            raise DepsolveError(f"APT command failed: {e.stderr}") from e

    def _run_apt_cache_command(self, command, args=None):
        """Run an apt-cache command with proper configuration."""
        if args is None:
            args = []

        # Set up APT configuration
        apt_opts = []
        for key, value in self.apt_config.items():
            apt_opts.extend(["-o", f"{key}={value}"])

        # Add root directory if specified
        if self.root_dir:
            apt_opts.extend(["-o", f"Dir={self.root_dir}"])

        # Build command
        full_command = ["apt-cache"] + apt_opts + [command] + args

        try:
            result = subprocess.run(
                full_command,
                capture_output=True,
                text=True,
                check=True,
                cwd=self.root_dir or "/"
            )
            return result
        except subprocess.CalledProcessError as e:
            raise DepsolveError(f"apt-cache command failed: {e.stderr}") from e

    def _update_package_lists(self):
        """Update package lists from repositories."""
        try:
            self._run_apt_command("update")
        except DepsolveError as e:
            raise RepoError(f"Failed to update package lists: {e}") from e

    def dump(self):
        """Dump the current APT configuration and package state."""
        try:
            # Get package list
            result = self._run_apt_cache_command("pkgnames")
            packages = result.stdout.strip().split('\n') if result.stdout.strip() else []

            # Get repository information
            repo_info = []
            for repo in self.repos:
                repo_info.append({
                    "name": repo["name"],
                    "baseurl": repo["baseurl"],
                    "enabled": repo["enabled"],
                    "priority": repo["priority"],
                    "components": repo["components"],
                    "architectures": repo["architectures"],
                })

            return {
                "packages": packages,
                "repositories": repo_info,
                "architecture": self.arch,
                "releasever": self.releasever,
                "root_dir": self.root_dir,
                "timestamp": datetime.now().isoformat(),
            }
        except Exception as e:
            raise DepsolveError(f"Failed to dump APT state: {e}") from e

    def depsolve(self, arguments):
        """Resolve dependencies for the given packages."""
        packages = arguments.get("packages", [])
        exclude_packages = arguments.get("exclude_packages", [])
        allow_erasing = arguments.get("allow_erasing", False)
        best = arguments.get("best", True)
        clean_requirements_on_remove = arguments.get("clean_requirements_on_remove", True)

        if not packages:
            return []

        try:
            # Update package lists first
            self._update_package_lists()

            # Build apt-get command arguments
            apt_args = []

            if best:
                apt_args.append("--fix-broken")

            if allow_erasing:
                apt_args.append("--allow-remove-essential")

            if clean_requirements_on_remove:
                apt_args.append("--auto-remove")

            # Add packages to install
            apt_args.extend(packages)

            # Add packages to exclude
            for pkg in exclude_packages:
                apt_args.extend(["--exclude", pkg])

            # Run dependency resolution
            result = self._run_apt_command("install", apt_args, env={"DEBIAN_FRONTEND": "noninteractive"})

            # Parse the output to get resolved packages
            resolved_packages = self._parse_apt_output(result.stdout)

            return resolved_packages

        except Exception as e:
            raise DepsolveError(f"Dependency resolution failed: {e}") from e

    def _parse_apt_output(self, output):
        """Parse apt-get output to extract resolved package information."""
        packages = []
        lines = output.split('\n')

        for line in lines:
            line = line.strip()
            if line.startswith(('Inst', 'Upgrading', 'Removing')):
                # Parse package installation/upgrade/removal lines
                parts = line.split()
                if len(parts) >= 2:
                    action = parts[0]
                    package_info = parts[1]
                    
                    # Extract package name and version
                    if ':' in package_info:
                        pkg_name, pkg_version = package_info.split(':', 1)
                    else:
                        pkg_name = package_info
                        pkg_version = None

                    packages.append({
                        "name": pkg_name,
                        "version": pkg_version,
                        "action": action,
                        "arch": self.arch,
                    })

        return packages

    def search(self, args):
        """Search for packages matching the given criteria."""
        query = args.get("query", "")
        match_type = args.get("match_type", "name")
        limit = args.get("limit", 100)

        if not query:
            return []

        try:
            # Update package lists first
            self._update_package_lists()

            # Build search command
            search_args = []
            
            if match_type == "name":
                search_args.extend(["--names-only", query])
            elif match_type == "description":
                search_args.extend(["--full", query])
            else:
                search_args.append(query)

            # Run search
            result = self._run_apt_cache_command("search", search_args)

            # Parse results
            packages = self._parse_search_output(result.stdout, limit)

            return packages

        except Exception as e:
            raise DepsolveError(f"Package search failed: {e}") from e

    def _parse_search_output(self, output, limit):
        """Parse apt-cache search output to extract package information."""
        packages = []
        lines = output.split('\n')

        for line in lines:
            if not line.strip() or len(packages) >= limit:
                break

            # Parse package name and description
            if ' - ' in line:
                pkg_name, description = line.split(' - ', 1)
                packages.append({
                    "name": pkg_name.strip(),
                    "description": description.strip(),
                    "arch": self.arch,
                })

        return packages

    def get_package_info(self, package_name):
        """Get detailed information about a specific package."""
        try:
            result = self._run_apt_cache_command("show", [package_name])
            return self._parse_package_info(result.stdout)
        except Exception as e:
            raise DepsolveError(f"Failed to get package info for {package_name}: {e}") from e

    def _parse_package_info(self, output):
        """Parse apt-cache show output to extract package information."""
        info = {}
        lines = output.split('\n')

        for line in lines:
            line = line.strip()
            if ':' in line:
                key, value = line.split(':', 1)
                key = key.strip().lower().replace(' ', '_')
                value = value.strip()
                info[key] = value

        return info

    def get_dependencies(self, package_name):
        """Get dependencies for a specific package."""
        try:
            result = self._run_apt_cache_command("depends", [package_name])
            return self._parse_dependencies(result.stdout)
        except Exception as e:
            raise DepsolveError(f"Failed to get dependencies for {package_name}: {e}") from e

    def _parse_dependencies(self, output):
        """Parse apt-cache depends output to extract dependency information."""
        dependencies = {
            "depends": [],
            "recommends": [],
            "suggests": [],
            "conflicts": [],
            "breaks": [],
            "replaces": [],
        }

        lines = output.split('\n')
        current_type = None

        for line in lines:
            line = line.strip()
            if not line:
                continue

            if line.startswith('Depends:'):
                current_type = "depends"
            elif line.startswith('Recommends:'):
                current_type = "recommends"
            elif line.startswith('Suggests:'):
                current_type = "suggests"
            elif line.startswith('Conflicts:'):
                current_type = "conflicts"
            elif line.startswith('Breaks:'):
                current_type = "breaks"
            elif line.startswith('Replaces:'):
                current_type = "replaces"
            elif current_type and line.startswith(' '):
                # Continuation line
                dep = line.strip()
                if dep:
                    dependencies[current_type].append(dep)
            elif current_type and not line.startswith(' '):
                # New dependency type
                current_type = None

        return dependencies