// Package wizard provides configuration export functionality.
package wizard

import (
	"encoding/json"
	"fmt"
	"os"
	"path/filepath"

	"github.com/goccy/go-yaml"

	"github.com/ivuorinen/gh-action-readme/internal"
)

// ExportFormat represents the supported export formats.
type ExportFormat string

const (
	// FormatYAML exports configuration as YAML.
	FormatYAML ExportFormat = "yaml"
	// FormatJSON exports configuration as JSON.
	FormatJSON ExportFormat = "json"
	// FormatTOML exports configuration as TOML.
	FormatTOML ExportFormat = "toml"
)

// ConfigExporter handles exporting configuration to various formats.
type ConfigExporter struct {
	output *internal.ColoredOutput
}

// NewConfigExporter creates a new configuration exporter.
func NewConfigExporter(output *internal.ColoredOutput) *ConfigExporter {
	return &ConfigExporter{
		output: output,
	}
}

// ExportConfig exports the configuration to the specified format and path.
func (e *ConfigExporter) ExportConfig(config *internal.AppConfig, format ExportFormat, outputPath string) error {
	// Create output directory if it doesn't exist
	if err := os.MkdirAll(filepath.Dir(outputPath), 0750); err != nil { // #nosec G301 -- output directory permissions
		return fmt.Errorf("failed to create output directory: %w", err)
	}

	switch format {
	case FormatYAML:
		return e.exportYAML(config, outputPath)
	case FormatJSON:
		return e.exportJSON(config, outputPath)
	case FormatTOML:
		return e.exportTOML(config, outputPath)
	default:
		return fmt.Errorf("unsupported export format: %s", format)
	}
}

// GetSupportedFormats returns the list of supported export formats.
func (e *ConfigExporter) GetSupportedFormats() []ExportFormat {
	return []ExportFormat{FormatYAML, FormatJSON, FormatTOML}
}

// GetDefaultOutputPath returns the default output path for a given format.
func (e *ConfigExporter) GetDefaultOutputPath(format ExportFormat) (string, error) {
	configPath, err := internal.GetConfigPath()
	if err != nil {
		return "", fmt.Errorf("failed to get config directory: %w", err)
	}

	dir := filepath.Dir(configPath)

	switch format {
	case FormatYAML:
		return filepath.Join(dir, "config.yaml"), nil
	case FormatJSON:
		return filepath.Join(dir, "config.json"), nil
	case FormatTOML:
		return filepath.Join(dir, "config.toml"), nil
	default:
		return "", fmt.Errorf("unsupported format: %s", format)
	}
}

// exportYAML exports configuration as YAML.
func (e *ConfigExporter) exportYAML(config *internal.AppConfig, outputPath string) error {
	// Create a clean config without sensitive data for export
	exportConfig := e.sanitizeConfig(config)

	file, err := os.Create(outputPath) // #nosec G304 -- output path from function parameter
	if err != nil {
		return fmt.Errorf("failed to create YAML file: %w", err)
	}
	defer func() {
		_ = file.Close() // File will be closed, error not actionable in defer
	}()

	encoder := yaml.NewEncoder(file, yaml.Indent(2))

	// Add header comment
	_, _ = file.WriteString("# gh-action-readme configuration file\n")
	_, _ = file.WriteString("# Generated by the interactive configuration wizard\n\n")

	if err := encoder.Encode(exportConfig); err != nil {
		return fmt.Errorf("failed to encode YAML: %w", err)
	}

	e.output.Success("Configuration exported to: %s", outputPath)

	return nil
}

// exportJSON exports configuration as JSON.
func (e *ConfigExporter) exportJSON(config *internal.AppConfig, outputPath string) error {
	// Create a clean config without sensitive data for export
	exportConfig := e.sanitizeConfig(config)

	file, err := os.Create(outputPath) // #nosec G304 -- output path from function parameter
	if err != nil {
		return fmt.Errorf("failed to create JSON file: %w", err)
	}
	defer func() {
		_ = file.Close() // File will be closed, error not actionable in defer
	}()

	encoder := json.NewEncoder(file)
	encoder.SetIndent("", "  ")

	if err := encoder.Encode(exportConfig); err != nil {
		return fmt.Errorf("failed to encode JSON: %w", err)
	}

	e.output.Success("Configuration exported to: %s", outputPath)

	return nil
}

// exportTOML exports configuration as TOML.
func (e *ConfigExporter) exportTOML(config *internal.AppConfig, outputPath string) error {
	// For now, we'll use a basic TOML export since the TOML library adds dependencies
	// In a full implementation, you would use "github.com/BurntSushi/toml"
	exportConfig := e.sanitizeConfig(config)

	file, err := os.Create(outputPath) // #nosec G304 -- output path from function parameter
	if err != nil {
		return fmt.Errorf("failed to create TOML file: %w", err)
	}
	defer func() {
		_ = file.Close() // File will be closed, error not actionable in defer
	}()

	// Write TOML header
	_, _ = file.WriteString("# gh-action-readme configuration file\n")
	_, _ = file.WriteString("# Generated by the interactive configuration wizard\n\n")

	// Basic TOML export (simplified version)
	e.writeTOMLConfig(file, exportConfig)

	e.output.Success("Configuration exported to: %s", outputPath)

	return nil
}

// sanitizeConfig removes sensitive information from config for export.
func (e *ConfigExporter) sanitizeConfig(config *internal.AppConfig) *internal.AppConfig {
	// Create a copy of the config
	sanitized := *config

	// Remove sensitive information
	sanitized.GitHubToken = ""    // Never export tokens
	sanitized.RepoOverrides = nil // Don't export repo overrides

	// Remove empty/default values to keep the config clean
	if sanitized.Organization == "" {
		sanitized.Organization = ""
	}
	if sanitized.Repository == "" {
		sanitized.Repository = ""
	}
	if sanitized.Version == "" {
		sanitized.Version = ""
	}

	// Remove legacy fields if they match defaults
	defaults := internal.DefaultAppConfig()
	if sanitized.Template == defaults.Template {
		sanitized.Template = ""
	}
	if sanitized.Header == defaults.Header {
		sanitized.Header = ""
	}
	if sanitized.Footer == defaults.Footer {
		sanitized.Footer = ""
	}
	if sanitized.Schema == defaults.Schema {
		sanitized.Schema = ""
	}

	return &sanitized
}

// writeTOMLConfig writes a basic TOML configuration.
func (e *ConfigExporter) writeTOMLConfig(file *os.File, config *internal.AppConfig) {
	e.writeRepositorySection(file, config)
	e.writeTemplateSection(file, config)
	e.writeFeaturesSection(file, config)
	e.writeBehaviorSection(file, config)
	e.writeWorkflowSection(file, config)
	e.writePermissionsSection(file, config)
	e.writeVariablesSection(file, config)
}

// writeRepositorySection writes the repository information section.
func (e *ConfigExporter) writeRepositorySection(file *os.File, config *internal.AppConfig) {
	_, _ = fmt.Fprintf(file, "# Repository Information\n")
	if config.Organization != "" {
		_, _ = fmt.Fprintf(file, "organization = %q\n", config.Organization)
	}
	if config.Repository != "" {
		_, _ = fmt.Fprintf(file, "repository = %q\n", config.Repository)
	}
	if config.Version != "" {
		_, _ = fmt.Fprintf(file, "version = %q\n", config.Version)
	}
}

// writeTemplateSection writes the template settings section.
func (e *ConfigExporter) writeTemplateSection(file *os.File, config *internal.AppConfig) {
	_, _ = fmt.Fprintf(file, "\n# Template Settings\n")
	_, _ = fmt.Fprintf(file, "theme = %q\n", config.Theme)
	_, _ = fmt.Fprintf(file, "output_format = %q\n", config.OutputFormat)
	_, _ = fmt.Fprintf(file, "output_dir = %q\n", config.OutputDir)
}

// writeFeaturesSection writes the features section.
func (e *ConfigExporter) writeFeaturesSection(file *os.File, config *internal.AppConfig) {
	_, _ = fmt.Fprintf(file, "\n# Features\n")
	_, _ = fmt.Fprintf(file, "analyze_dependencies = %t\n", config.AnalyzeDependencies)
	_, _ = fmt.Fprintf(file, "show_security_info = %t\n", config.ShowSecurityInfo)
}

// writeBehaviorSection writes the behavior section.
func (e *ConfigExporter) writeBehaviorSection(file *os.File, config *internal.AppConfig) {
	_, _ = fmt.Fprintf(file, "\n# Behavior\n")
	_, _ = fmt.Fprintf(file, "verbose = %t\n", config.Verbose)
	_, _ = fmt.Fprintf(file, "quiet = %t\n", config.Quiet)
}

// writeWorkflowSection writes the workflow requirements section.
func (e *ConfigExporter) writeWorkflowSection(file *os.File, config *internal.AppConfig) {
	if len(config.RunsOn) == 0 {
		return
	}

	_, _ = fmt.Fprintf(file, "\n# Workflow Requirements\n")
	_, _ = fmt.Fprintf(file, "runs_on = [")
	for i, runner := range config.RunsOn {
		if i > 0 {
			_, _ = fmt.Fprintf(file, ", ")
		}
		_, _ = fmt.Fprintf(file, "%q", runner)
	}
	_, _ = fmt.Fprintf(file, "]\n")
}

// writePermissionsSection writes the permissions section.
func (e *ConfigExporter) writePermissionsSection(file *os.File, config *internal.AppConfig) {
	if len(config.Permissions) == 0 {
		return
	}

	_, _ = fmt.Fprintf(file, "\n[permissions]\n")
	for key, value := range config.Permissions {
		_, _ = fmt.Fprintf(file, "%s = %q\n", key, value)
	}
}

// writeVariablesSection writes the variables section.
func (e *ConfigExporter) writeVariablesSection(file *os.File, config *internal.AppConfig) {
	if len(config.Variables) == 0 {
		return
	}

	_, _ = fmt.Fprintf(file, "\n[variables]\n")
	for key, value := range config.Variables {
		_, _ = fmt.Fprintf(file, "%s = %q\n", key, value)
	}
}