// Package templates provides output formatting templates and customization options.
package templates

import (
	"time"

	"github.com/ivuorinen/gibidify/shared"
)

// OutputTemplate represents a customizable output template.
type OutputTemplate struct {
	Name        string            `json:"name"        yaml:"name"`
	Description string            `json:"description" yaml:"description"`
	Format      string            `json:"format"      yaml:"format"` // markdown, json, yaml
	Header      string            `json:"header"      yaml:"header"`
	Footer      string            `json:"footer"      yaml:"footer"`
	FileHeader  string            `json:"file_header" yaml:"file_header"`
	FileFooter  string            `json:"file_footer" yaml:"file_footer"`
	Metadata    MetadataOptions   `json:"metadata"    yaml:"metadata"`
	Markdown    MarkdownOptions   `json:"markdown"    yaml:"markdown"`
	Variables   map[string]string `json:"variables"   yaml:"variables"`
}

// MetadataOptions controls what metadata to include in the output.
type MetadataOptions struct {
	IncludeStats          bool `json:"include_stats"           yaml:"include_stats"`
	IncludeTimestamp      bool `json:"include_timestamp"       yaml:"include_timestamp"`
	IncludeFileCount      bool `json:"include_file_count"      yaml:"include_file_count"`
	IncludeSourcePath     bool `json:"include_source_path"     yaml:"include_source_path"`
	IncludeFileTypes      bool `json:"include_file_types"      yaml:"include_file_types"`
	IncludeProcessingTime bool `json:"include_processing_time" yaml:"include_processing_time"`
	IncludeTotalSize      bool `json:"include_total_size"      yaml:"include_total_size"`
	IncludeMetrics        bool `json:"include_metrics"         yaml:"include_metrics"`
}

// MarkdownOptions controls markdown-specific formatting.
type MarkdownOptions struct {
	UseCodeBlocks      bool   `json:"use_code_blocks"     yaml:"use_code_blocks"`
	IncludeLanguage    bool   `json:"include_language"    yaml:"include_language"`
	HeaderLevel        int    `json:"header_level"        yaml:"header_level"` // 1-6 for # levels
	TableOfContents    bool   `json:"table_of_contents"   yaml:"table_of_contents"`
	UseCollapsible     bool   `json:"use_collapsible"     yaml:"use_collapsible"`
	SyntaxHighlighting bool   `json:"syntax_highlighting" yaml:"syntax_highlighting"`
	LineNumbers        bool   `json:"line_numbers"        yaml:"line_numbers"`
	FoldLongFiles      bool   `json:"fold_long_files"     yaml:"fold_long_files"`
	MaxLineLength      int    `json:"max_line_length"     yaml:"max_line_length"`
	CustomCSS          string `json:"custom_css"          yaml:"custom_css"`
}

// TemplateContext provides data available for template substitution.
type TemplateContext struct {
	// Basic information
	Timestamp  time.Time `json:"timestamp"`
	SourcePath string    `json:"source_path"`
	Format     string    `json:"format"`

	// File statistics
	TotalFiles     int   `json:"total_files"`
	ProcessedFiles int   `json:"processed_files"`
	SkippedFiles   int   `json:"skipped_files"`
	ErrorFiles     int   `json:"error_files"`
	TotalSize      int64 `json:"total_size"`

	// Processing metrics
	ProcessingTime string         `json:"processing_time"`
	FilesPerSecond float64        `json:"files_per_second"`
	BytesPerSecond float64        `json:"bytes_per_second"`
	FileTypes      map[string]int `json:"file_types"`

	// Custom variables
	Variables map[string]string `json:"variables"`
}

// FileContext provides data for individual file formatting.
type FileContext struct {
	Path         string    `json:"path"`
	RelativePath string    `json:"relative_path"`
	Name         string    `json:"name"`
	Extension    string    `json:"extension"`
	Language     string    `json:"language"`
	Size         int64     `json:"size"`
	ModTime      time.Time `json:"mod_time"`
	Content      string    `json:"content"`
	LineCount    int       `json:"line_count"`
	IsLarge      bool      `json:"is_large"`
	Truncated    bool      `json:"truncated"`
}

// BuiltinTemplates contains predefined templates.
var BuiltinTemplates = map[string]OutputTemplate{
	"default": {
		Name:        "Default",
		Description: "Standard output template",
		Format:      shared.FormatMarkdown,
		Header:      "# {{.SourcePath}}\n\nGenerated on {{.Timestamp.Format \"2006-01-02 15:04:05\"}}\n",
		Footer:      "\n---\nGenerated by gibidify\n",
		FileHeader:  "## {{.Path}}\n\n```{{.Language}}\n",
		FileFooter:  "```\n\n",
		Metadata: MetadataOptions{
			IncludeStats:      true,
			IncludeTimestamp:  true,
			IncludeFileCount:  true,
			IncludeSourcePath: true,
		},
		Markdown: MarkdownOptions{
			UseCodeBlocks:      true,
			IncludeLanguage:    true,
			HeaderLevel:        2,
			SyntaxHighlighting: true,
		},
	},
	"minimal": {
		Name:        "Minimal",
		Description: "Minimal output with just file contents",
		Format:      shared.FormatMarkdown,
		Header:      "",
		Footer:      "",
		FileHeader:  "<!-- {{.Path}} -->\n",
		FileFooter:  "\n",
		Metadata: MetadataOptions{
			IncludeStats:      false,
			IncludeTimestamp:  false,
			IncludeFileCount:  false,
			IncludeSourcePath: false,
		},
		Markdown: MarkdownOptions{
			UseCodeBlocks:   false,
			IncludeLanguage: false,
		},
	},
	"detailed": {
		Name:        "Detailed",
		Description: "Comprehensive output with full metadata",
		Format:      shared.FormatMarkdown,
		Header: `# Project Analysis: {{.SourcePath}}

Generated on {{.Timestamp.Format "January 2, 2006 at 3:04 PM"}}

## Summary

- **Total Files**: {{.TotalFiles}}
- **Processed Files**: {{.ProcessedFiles}}
- **Total Size**: {{.TotalSize}} bytes
- **Processing Time**: {{.ProcessingTime}}
- **Rate**: {{.FilesPerSecond}} files/sec

`,
		Footer: "\n---\n*Generated by gibidify*\n",
		FileHeader: "### {{.RelativePath}}\n\n**Language**: {{.Language}}  \n" +
			"**Size**: {{.Size}} bytes  \n**Lines**: {{.LineCount}}  \n\n```{{.Language}}\n",
		FileFooter: "```\n\n",
		Metadata: MetadataOptions{
			IncludeStats:          true,
			IncludeTimestamp:      true,
			IncludeFileCount:      true,
			IncludeSourcePath:     true,
			IncludeFileTypes:      true,
			IncludeProcessingTime: true,
			IncludeTotalSize:      true,
			IncludeMetrics:        true,
		},
		Markdown: MarkdownOptions{
			UseCodeBlocks:      true,
			IncludeLanguage:    true,
			HeaderLevel:        3,
			TableOfContents:    true,
			SyntaxHighlighting: true,
			LineNumbers:        false,
		},
	},
	"compact": {
		Name:        "Compact",
		Description: "Space-efficient output with collapsible sections",
		Format:      shared.FormatMarkdown,
		Header: "# {{.SourcePath}}\n\n<details><summary>📊 Stats ({{.TotalFiles}} files)</summary>\n\n" +
			"- Processed: {{.ProcessedFiles}}\n- Size: {{.TotalSize}} bytes\n" +
			"- Time: {{.ProcessingTime}}\n\n</details>\n\n",
		Footer:     "\n---\n*Compressed with gibidify*\n",
		FileHeader: "<details><summary>📄 {{.RelativePath}} ({{.Size}} bytes)</summary>\n\n```{{.Language}}\n",
		FileFooter: "```\n\n</details>\n\n",
		Metadata: MetadataOptions{
			IncludeStats:     true,
			IncludeFileCount: true,
			IncludeTotalSize: true,
		},
		Markdown: MarkdownOptions{
			UseCodeBlocks:      true,
			IncludeLanguage:    true,
			UseCollapsible:     true,
			SyntaxHighlighting: true,
		},
	},
}

// DefaultMetadataOptions returns the default metadata options.
func DefaultMetadataOptions() MetadataOptions {
	return MetadataOptions{
		IncludeStats:          true,
		IncludeTimestamp:      true,
		IncludeFileCount:      true,
		IncludeSourcePath:     true,
		IncludeFileTypes:      false,
		IncludeProcessingTime: false,
		IncludeTotalSize:      false,
		IncludeMetrics:        false,
	}
}

// DefaultMarkdownOptions returns the default markdown options.
func DefaultMarkdownOptions() MarkdownOptions {
	return MarkdownOptions{
		UseCodeBlocks:      true,
		IncludeLanguage:    true,
		HeaderLevel:        2,
		TableOfContents:    false,
		UseCollapsible:     false,
		SyntaxHighlighting: true,
		LineNumbers:        false,
		FoldLongFiles:      false,
		MaxLineLength:      120,
	}
}