"""Base commands for module: list, search, show, validate, generate."""

from __future__ import annotations

import logging
from dataclasses import dataclass
from pathlib import Path

from typer import Exit

from ..config import ConfigManager
from ..display import DisplayManager, IconManager
from ..exceptions import (
    TemplateRenderError,
    TemplateSyntaxError,
    TemplateValidationError,
)
from ..input import InputManager
from ..template import Template
from ..validators import get_validator_registry
from .generation_destination import (
    GenerationDestination,
    format_remote_destination,
    prompt_generation_destination,
    resolve_cli_destination,
    write_rendered_files_remote,
)
from .helpers import (
    apply_cli_overrides,
    apply_var_file,
    apply_variable_defaults,
    collect_variable_values,
)

logger = logging.getLogger(__name__)

# File size thresholds for display formatting
BYTES_PER_KB = 1024
BYTES_PER_MB = 1024 * 1024


@dataclass
class GenerationConfig:
    """Configuration for template generation."""

    id: str
    output: str | None = None
    remote: str | None = None
    remote_path: str | None = None
    interactive: bool = True
    var: list[str] | None = None
    var_file: str | None = None
    dry_run: bool = False
    show_files: bool = False
    quiet: bool = False
    name: str | None = None


def list_templates(module_instance, raw: bool = False) -> list:
    """List all templates."""
    logger.debug(f"Listing templates for module '{module_instance.name}'")

    # Load all templates using centralized helper
    filtered_templates = module_instance._load_all_templates()

    if filtered_templates:
        if raw:
            # Output raw format (tab-separated values for easy filtering with awk/sed/cut)
            # Format: ID\tNAME\tTAGS\tVERSION\tLIBRARY
            for template in filtered_templates:
                name = template.metadata.name or "Unnamed Template"
                tags_list = template.metadata.tags or []
                tags = ",".join(tags_list) if tags_list else "-"
                version = template.metadata.version.name if template.metadata.version else "-"
                library = template.metadata.library or "-"
                module_instance.display.text("\t".join([template.id, name, tags, version, library]))
        else:
            # Output rich table format
            def format_template_row(template):
                name = template.metadata.name or "Unnamed Template"
                tags_list = template.metadata.tags or []
                tags = ", ".join(tags_list) if tags_list else "-"
                version = template.metadata.version.name if template.metadata.version else ""
                library_name = template.metadata.library or ""
                library_type = template.metadata.library_type or "git"
                # Format library with icon and color
                icon = IconManager.UI_LIBRARY_STATIC if library_type == "static" else IconManager.UI_LIBRARY_GIT
                color = "yellow" if library_type == "static" else "blue"
                library_display = f"[{color}]{icon} {library_name}[/{color}]"
                return (template.id, name, tags, version, library_display)

            module_instance.display.data_table(
                columns=[
                    {"name": "ID", "style": "bold", "no_wrap": True},
                    {"name": "Name"},
                    {"name": "Tags"},
                    {"name": "Version", "no_wrap": True},
                    {"name": "Library", "no_wrap": True},
                ],
                rows=filtered_templates,
                row_formatter=format_template_row,
            )
    else:
        logger.info(f"No templates found for module '{module_instance.name}'")
        module_instance.display.info(
            f"No templates found for module '{module_instance.name}'",
            context="Use 'bp repo update' to update libraries or check library configuration",
        )

    return filtered_templates


def search_templates(module_instance, query: str) -> list:
    """Search for templates by ID containing the search string."""
    logger.debug(f"Searching templates for module '{module_instance.name}' with query='{query}'")

    # Load templates with search filter using centralized helper
    filtered_templates = module_instance._load_all_templates(lambda t: query.lower() in t.id.lower())

    if filtered_templates:
        logger.info(f"Found {len(filtered_templates)} templates matching '{query}' for module '{module_instance.name}'")

        def format_template_row(template):
            name = template.metadata.name or "Unnamed Template"
            tags_list = template.metadata.tags or []
            tags = ", ".join(tags_list) if tags_list else "-"
            version = template.metadata.version.name if template.metadata.version else ""
            library_name = template.metadata.library or ""
            library_type = template.metadata.library_type or "git"
            # Format library with icon and color
            icon = IconManager.UI_LIBRARY_STATIC if library_type == "static" else IconManager.UI_LIBRARY_GIT
            color = "yellow" if library_type == "static" else "blue"
            library_display = f"[{color}]{icon} {library_name}[/{color}]"
            return (template.id, name, tags, version, library_display)

        module_instance.display.data_table(
            columns=[
                {"name": "ID", "style": "bold", "no_wrap": True},
                {"name": "Name"},
                {"name": "Tags"},
                {"name": "Version", "no_wrap": True},
                {"name": "Library", "no_wrap": True},
            ],
            rows=filtered_templates,
            row_formatter=format_template_row,
        )
    else:
        logger.info(f"No templates found matching '{query}' for module '{module_instance.name}'")
        module_instance.display.warning(
            f"No templates found matching '{query}'",
            context=f"module '{module_instance.name}'",
        )

    return filtered_templates


def show_template(module_instance, id: str, var: list[str] | None = None, var_file: str | None = None) -> None:
    """Show template details with optional variable overrides."""
    logger.debug(f"Showing template '{id}' from module '{module_instance.name}'")
    template = module_instance._load_template_by_id(id)

    if not template:
        module_instance.display.error(f"Template '{id}' not found", context=f"module '{module_instance.name}'")
        return

    # Apply defaults and overrides (same precedence as generate command)
    if template.variables:
        config = ConfigManager()
        apply_variable_defaults(template, config, module_instance.name)
        apply_var_file(template, var_file, module_instance.display)
        apply_cli_overrides(template, var)

        # Re-sort sections after applying overrides (toggle values may have changed)
        template.variables.sort_sections()

        # Reset disabled bool variables to False to prevent confusion
        reset_vars = template.variables.reset_disabled_bool_variables()
        if reset_vars:
            logger.debug(f"Reset {len(reset_vars)} disabled bool variables to False")

    # Display template header
    module_instance.display.templates.render_template_header(template, id)
    # Display file tree
    module_instance.display.templates.render_file_tree(template)
    # Display variables table
    module_instance.display.variables.render_variables_table(template)


def check_output_directory(
    output_dir: Path,
    rendered_files: dict[str, str],
    interactive: bool,
    display: DisplayManager,
) -> list[Path] | None:
    """Check output directory for conflicts and get user confirmation if needed."""
    dir_exists = output_dir.exists()
    dir_not_empty = dir_exists and any(output_dir.iterdir())

    # Check which files already exist
    existing_files = []
    if dir_exists:
        for file_path in rendered_files:
            full_path = output_dir / file_path
            if full_path.exists():
                existing_files.append(full_path)

    # Warn if directory is not empty
    if dir_not_empty:
        if interactive:
            display.text("")  # Add newline before warning
            # Combine directory warning and file count on same line
            warning_msg = f"Directory '{output_dir}' is not empty."
            if existing_files:
                warning_msg += f" {len(existing_files)} file(s) will be overwritten."
            display.warning(warning_msg)
            display.text("")  # Add newline after warning

            input_mgr = InputManager()
            if not input_mgr.confirm("Continue?", default=False):
                display.info("Generation cancelled")
                return None
        else:
            # Non-interactive mode: show warning but continue
            logger.warning(f"Directory '{output_dir}' is not empty")
            if existing_files:
                logger.warning(f"{len(existing_files)} file(s) will be overwritten")

    return existing_files


def _analyze_file_operations(
    output_dir: Path, rendered_files: dict[str, str]
) -> tuple[list[tuple[str, int, str]], int, int, int]:
    """Analyze file operations and return statistics."""
    total_size = 0
    new_files = 0
    overwrite_files = 0
    file_operations = []

    for file_path, content in sorted(rendered_files.items()):
        full_path = output_dir / file_path
        file_size = len(content.encode("utf-8"))
        total_size += file_size

        if full_path.exists():
            status = "Overwrite"
            overwrite_files += 1
        else:
            status = "Create"
            new_files += 1

        file_operations.append((file_path, file_size, status))

    return file_operations, total_size, new_files, overwrite_files


def _format_size(total_size: int) -> str:
    """Format byte size into human-readable string."""
    if total_size < BYTES_PER_KB:
        return f"{total_size}B"
    if total_size < BYTES_PER_MB:
        return f"{total_size / BYTES_PER_KB:.1f}KB"
    return f"{total_size / BYTES_PER_MB:.1f}MB"


def _get_rendered_file_stats(rendered_files: dict[str, str]) -> tuple[int, int, str]:
    """Return file count, total size, and formatted size for rendered output."""
    total_size = sum(len(content.encode("utf-8")) for content in rendered_files.values())
    return len(rendered_files), total_size, _format_size(total_size)


def _display_rendered_file_contents(rendered_files: dict[str, str], display: DisplayManager) -> None:
    """Display rendered file contents for dry-run mode."""
    display.text("")
    display.heading("File Contents")
    for file_path, content in sorted(rendered_files.items()):
        display.text(f"\n[cyan]{file_path}[/cyan]")
        display.text(f"{'─' * 80}")
        display.text(content)
    display.text("")


def execute_dry_run(
    id: str,
    output_dir: Path,
    rendered_files: dict[str, str],
    show_files: bool,
    display: DisplayManager,
) -> tuple[int, int, str]:
    """Execute dry run mode - preview files without writing.

    Returns:
        Tuple of (total_files, overwrite_files, size_str) for summary display
    """
    _file_operations, total_size, _new_files, overwrite_files = _analyze_file_operations(output_dir, rendered_files)
    size_str = _format_size(total_size)

    if show_files:
        _display_rendered_file_contents(rendered_files, display)

    logger.info(f"Dry run completed for template '{id}' - {len(rendered_files)} files, {total_size} bytes")
    return len(rendered_files), overwrite_files, size_str


def execute_remote_dry_run(
    remote_host: str,
    remote_path: str,
    rendered_files: dict[str, str],
    show_files: bool,
    display: DisplayManager,
) -> tuple[int, str]:
    """Preview a remote upload without writing files."""
    total_files, _total_size, size_str = _get_rendered_file_stats(rendered_files)

    if show_files:
        _display_rendered_file_contents(rendered_files, display)

    logger.info(
        "Dry run completed for remote destination '%s' - %s files",
        format_remote_destination(remote_host, remote_path),
        total_files,
    )
    return total_files, size_str


def _validate_output_name(name: str) -> str:
    """Validate and normalize a generated output name."""
    normalized_name = name.strip()
    if not normalized_name:
        raise ValueError("--name cannot be empty")
    if "/" in normalized_name or "\\" in normalized_name:
        raise ValueError("--name must be a file name, not a path")
    if normalized_name in {".", ".."}:
        raise ValueError("--name cannot be '.' or '..'")
    return normalized_name


def _prefix_path_part(name: str, part: str) -> str:
    """Prefix one top-level path part with the generated output name."""
    path = Path(part)
    if path.stem == "main" and path.suffix:
        return f"{name}{path.suffix}"
    return f"{name}_{part}"


def apply_output_name(rendered_files: dict[str, str], name: str | None) -> dict[str, str]:
    """Rename top-level generated paths with a user-provided output name.

    The top-level entrypoint file named ``main.<ext>`` becomes ``<name>.<ext>``.
    All other top-level files or directories receive ``<name>_`` as a prefix.
    Nested path segments are preserved unchanged.
    """
    if name is None:
        return rendered_files

    normalized_name = _validate_output_name(name)
    renamed_files: dict[str, str] = {}
    for file_path, content in rendered_files.items():
        path = Path(file_path)
        parts = path.parts
        if not parts:
            continue

        renamed_top_level = _prefix_path_part(normalized_name, parts[0])
        renamed_path = Path(renamed_top_level, *parts[1:]).as_posix()
        if renamed_path in renamed_files:
            raise ValueError(f"--name creates duplicate generated path: {renamed_path}")
        renamed_files[renamed_path] = content

    return renamed_files


def write_rendered_files(output_dir: Path, rendered_files: dict[str, str]) -> None:
    """Write rendered files to the output directory."""
    output_dir.mkdir(parents=True, exist_ok=True)

    for file_path, content in rendered_files.items():
        full_path = output_dir / file_path
        full_path.parent.mkdir(parents=True, exist_ok=True)
        with full_path.open("w", encoding="utf-8") as f:
            f.write(content)

    logger.info(f"Template written to directory: {output_dir}")


def _prepare_template(
    module_instance,
    id: str,
    var_file: str | None,
    var: list[str] | None,
    display: DisplayManager,
):
    """Load template and apply all defaults/overrides."""
    template = module_instance._load_template_by_id(id)
    config = ConfigManager()
    apply_variable_defaults(template, config, module_instance.name)
    apply_var_file(template, var_file, display)
    apply_cli_overrides(template, var)

    if template.variables:
        template.variables.sort_sections()
        reset_vars = template.variables.reset_disabled_bool_variables()
        if reset_vars:
            logger.debug(f"Reset {len(reset_vars)} disabled bool variables to False")

    return template


def _render_template(template, id: str, display: DisplayManager, interactive: bool):
    """Validate, render template and collect variable values."""
    variable_values = collect_variable_values(template, interactive)

    if template.variables:
        template.variables.validate_all()

    debug_mode = logger.isEnabledFor(logging.DEBUG)
    rendered_files, variable_values = template.render(template.variables, debug=debug_mode)

    if not rendered_files:
        display.error(
            "Template rendering returned no files",
            context="template generation",
        )
        raise Exit(code=1)

    logger.info(f"Successfully rendered template '{id}'")
    return rendered_files, variable_values


def _display_template_error(display: DisplayManager, template_id: str, error: TemplateRenderError) -> None:
    """Display template rendering error with clean formatting."""
    display.text("")
    display.text("─" * 80, style="dim")
    display.text("")

    # Build details if available
    details = None
    if error.file_path:
        details = error.file_path
        if error.line_number:
            details += f":line {error.line_number}"

    # Display error with details
    display.error(f"Failed to generate boilerplate from template '{template_id}'", details=details)


def _display_generic_error(display: DisplayManager, template_id: str, error: Exception) -> None:
    """Display generic error with clean formatting."""
    display.text("")
    display.text("─" * 80, style="dim")
    display.text("")

    # Truncate long error messages
    max_error_length = 100
    error_msg = str(error)
    if len(error_msg) > max_error_length:
        error_msg = f"{error_msg[:max_error_length]}..."

    # Display error with details
    display.error(f"Failed to generate boilerplate from template '{template_id}'", details=error_msg)


def generate_template(module_instance, config: GenerationConfig) -> None:  # noqa: PLR0912, PLR0915
    """Generate from template."""
    logger.info(f"Starting generation for template '{config.id}' from module '{module_instance.name}'")

    display = DisplayManager(quiet=config.quiet) if config.quiet else module_instance.display
    template = _prepare_template(module_instance, config.id, config.var_file, config.var, display)
    slug = getattr(template, "slug", template.id)
    used_implicit_dry_run_destination = False

    try:
        destination = resolve_cli_destination(config.output, config.remote, config.remote_path, slug)
    except ValueError as e:
        display.error(str(e), context="template generation")
        raise Exit(code=1) from None

    if not config.quiet:
        # Display template header
        module_instance.display.templates.render_template_header(template, config.id)
        # Display file tree
        module_instance.display.templates.render_file_tree(template)
        # Display variables table
        module_instance.display.variables.render_variables_table(template)
        module_instance.display.text("")

    try:
        rendered_files, _variable_values = _render_template(template, config.id, display, config.interactive)
        rendered_files = apply_output_name(rendered_files, config.name)

        if destination is None:
            if config.dry_run:
                destination = GenerationDestination(mode="local", local_output_dir=Path.cwd() / slug)
                used_implicit_dry_run_destination = True
            elif config.interactive:
                destination = prompt_generation_destination(slug)
            else:
                destination = GenerationDestination(mode="local", local_output_dir=Path.cwd() / slug)

        if not destination.is_remote:
            output_dir = destination.local_output_dir or (Path.cwd() / slug)
            if (
                not config.dry_run
                and not config.quiet
                and check_output_directory(output_dir, rendered_files, config.interactive, display) is None
            ):
                return

        # Execute generation (dry run or actual)
        dry_run_stats = None
        if destination.is_remote:
            remote_host = destination.remote_host or ""
            remote_path = destination.remote_path or f"~/{slug}"
            if config.dry_run:
                if not config.quiet:
                    dry_run_stats = execute_remote_dry_run(
                        remote_host,
                        remote_path,
                        rendered_files,
                        config.show_files,
                        display,
                    )
            else:
                write_rendered_files_remote(remote_host, remote_path, rendered_files)
        else:
            output_dir = destination.local_output_dir or (Path.cwd() / slug)
            if config.dry_run:
                if not config.quiet:
                    dry_run_stats = execute_dry_run(config.id, output_dir, rendered_files, config.show_files, display)
            else:
                write_rendered_files(output_dir, rendered_files)

        # Display final status message at the end
        if not config.quiet:
            display.text("")
            display.text("─" * 80, style="dim")

            if destination.is_remote:
                remote_host = destination.remote_host or ""
                remote_path = destination.remote_path or f"~/{slug}"
                remote_target = format_remote_destination(remote_host, remote_path)
                if config.dry_run and dry_run_stats:
                    total_files, size_str = dry_run_stats
                    display.success(
                        f"Dry run complete: {total_files} files ({size_str}) would be uploaded to '{remote_target}'"
                    )
                else:
                    display.success(f"Boilerplate uploaded successfully to '{remote_target}'")
            elif config.dry_run and dry_run_stats:
                total_files, overwrite_files, size_str = dry_run_stats
                if used_implicit_dry_run_destination:
                    display.success(
                        "Dry run complete: boilerplate rendered successfully "
                        f"({total_files} files, {size_str}, preview only)"
                    )
                elif overwrite_files > 0:
                    display.warning(
                        f"Dry run complete: {total_files} files ({size_str}) would be written to '{output_dir}' "
                        f"({overwrite_files} would be overwritten)"
                    )
                else:
                    display.success(
                        f"Dry run complete: {total_files} files ({size_str}) would be written to '{output_dir}'"
                    )
            else:
                display.success(f"Boilerplate generated successfully in '{output_dir}'")

    except TemplateRenderError as e:
        _display_template_error(display, config.id, e)
        raise Exit(code=1) from None
    except Exception as e:
        _display_generic_error(display, config.id, e)
        raise Exit(code=1) from None


def validate_templates(
    module_instance,
    template_id: str,
    path: str | None,
    verbose: bool,
    semantic: bool,
) -> None:
    """Validate templates for Jinja2 syntax, undefined variables, and semantic correctness."""
    # Load template based on input
    template = _load_template_for_validation(module_instance, template_id, path)

    if template:
        _validate_single_template(module_instance, template, template_id, verbose, semantic)
    else:
        _validate_all_templates(module_instance, verbose)


def _load_template_for_validation(module_instance, template_id: str, path: str | None):
    """Load a template from path or ID for validation."""
    if path:
        template_path = Path(path).resolve()
        if not template_path.exists():
            module_instance.display.error(f"Path does not exist: {path}")
            raise Exit(code=1) from None
        if not template_path.is_dir():
            module_instance.display.error(f"Path is not a directory: {path}")
            raise Exit(code=1) from None

        module_instance.display.info(f"[bold]Validating template from path:[/bold] [cyan]{template_path}[/cyan]")
        try:
            return Template(template_path, library_name="local")
        except Exception as e:
            module_instance.display.error(f"Failed to load template from path '{path}': {e}")
            raise Exit(code=1) from None

    if template_id:
        try:
            template = module_instance._load_template_by_id(template_id)
            module_instance.display.info(f"Validating template: {template_id}")
            return template
        except Exception as e:
            module_instance.display.error(f"Failed to load template '{template_id}': {e}")
            raise Exit(code=1) from None

    return None


def _validate_single_template(module_instance, template, template_id: str, verbose: bool, semantic: bool) -> None:
    """Validate a single template."""
    try:
        # Jinja2 validation
        _ = template.used_variables
        _ = template.variables
        module_instance.display.success("Jinja2 validation passed")

        # Semantic validation
        if semantic:
            _run_semantic_validation(module_instance, template, verbose)

        # Verbose output
        if verbose:
            _display_validation_details(module_instance, template, semantic)

    except TemplateRenderError as e:
        module_instance.display.error(str(e), context=f"template '{template_id}'")
        raise Exit(code=1) from None
    except (TemplateSyntaxError, TemplateValidationError, ValueError) as e:
        module_instance.display.error(f"Validation failed for '{template_id}':")
        module_instance.display.info(f"\n{e}")
        raise Exit(code=1) from None
    except Exception as e:
        module_instance.display.error(f"Unexpected error validating '{template_id}': {e}")
        raise Exit(code=1) from None


def _run_semantic_validation(module_instance, template, verbose: bool) -> None:
    """Run semantic validation on rendered template files."""
    module_instance.display.info("")
    module_instance.display.info("Running semantic validation...")

    registry = get_validator_registry()
    debug_mode = logger.isEnabledFor(logging.DEBUG)
    rendered_files, _ = template.render(template.variables, debug=debug_mode)

    has_semantic_errors = False
    for file_path, content in rendered_files.items():
        result = registry.validate_file(content, file_path)

        if result.errors or result.warnings or (verbose and result.info):
            module_instance.display.info(f"\nFile: {file_path}")
            result.display(f"{file_path}")

            if result.errors:
                has_semantic_errors = True

    if has_semantic_errors:
        module_instance.display.error("Semantic validation found errors")
        raise Exit(code=1) from None

    module_instance.display.success("Semantic validation passed")


def _display_validation_details(module_instance, template, semantic: bool) -> None:
    """Display verbose validation details."""
    module_instance.display.info(f"\nTemplate path: {template.template_dir}")
    module_instance.display.info(f"Found {len(template.used_variables)} variables")
    if semantic:
        debug_mode = logger.isEnabledFor(logging.DEBUG)
        rendered_files, _ = template.render(template.variables, debug=debug_mode)
        module_instance.display.info(f"Generated {len(rendered_files)} files")


def _validate_all_templates(module_instance, verbose: bool) -> None:
    """Validate all templates in the module."""
    module_instance.display.info(f"Validating all {module_instance.name} templates...")

    valid_count = 0
    invalid_count = 0
    errors = []

    all_templates = module_instance._load_all_templates()
    total = len(all_templates)

    for template in all_templates:
        try:
            _ = template.used_variables
            _ = template.variables
            valid_count += 1
            if verbose:
                module_instance.display.success(template.id)
        except ValueError as e:
            invalid_count += 1
            errors.append((template.id, str(e)))
            if verbose:
                module_instance.display.error(template.id)
        except Exception as e:
            invalid_count += 1
            errors.append((template.id, f"Load error: {e}"))
            if verbose:
                module_instance.display.warning(template.id)

    # Display summary
    module_instance.display.info("")
    module_instance.display.info(f"Total templates: {total}")
    module_instance.display.info(f"Valid: {valid_count}")
    module_instance.display.info(f"Invalid: {invalid_count}")

    if errors:
        module_instance.display.info("")
        for template_id, error_msg in errors:
            module_instance.display.error(f"{template_id}: {error_msg}")
        raise Exit(code=1)

    if total > 0:
        module_instance.display.info("")
        module_instance.display.success("All templates are valid")