package engine

import (
	"fmt"
	"os"
	"os/exec"
	"path/filepath"
	"regexp"
	"strings"
)

// SearchContent performs a full-text search using ripgrep
func (jd *JadeDepo) SearchContent(query string) ([]string, error) {
	// Check if ripgrep is available
	if _, err := exec.LookPath("rg"); err != nil {
		return nil, fmt.Errorf("ripgrep (rg) is not installed. Please install it to use search functionality")
	}

	// Run ripgrep to search for content
	cmd := exec.Command("rg",
		"--files-with-matches", // Only show filenames
		"--glob", "*.md",       // Only search markdown files
		"--glob", "!.jade", // Exclude .jade directory
		query,
		jd.Config.DepoPath,
	)

	output, err := cmd.Output()
	if err != nil {
		// ripgrep returns exit code 1 when no matches found
		if exitErr, ok := err.(*exec.ExitError); ok && exitErr.ExitCode() == 1 {
			return []string{}, nil
		}
		return nil, fmt.Errorf("search failed: %w", err)
	}

	// Parse output into list of files
	files := strings.Split(strings.TrimSpace(string(output)), "\n")

	// Make paths relative to depo
	var results []string
	for _, file := range files {
		if file != "" {
			relPath, err := filepath.Rel(jd.Config.DepoPath, file)
			if err != nil {
				relPath = file
			}
			results = append(results, relPath)
		}
	}

	return results, nil
}

// SearchByTag searches for notes containing a specific tag
func (jd *JadeDepo) SearchByTag(tag string) ([]string, error) {
	// Ensure tag has prefix
	if !strings.HasPrefix(tag, jd.Config.TagPrefix) {
		tag = jd.Config.TagPrefix + tag
	}

	// Use ripgrep to find the tag (escape special regex characters)
	escapedTag := regexp.QuoteMeta(tag)
	return jd.SearchContent(escapedTag)
}

// ListAllNotes returns all markdown notes in the depository
func (jd *JadeDepo) ListAllNotes() ([]*Note, error) {
	var notes []*Note

	err := filepath.Walk(jd.Config.DepoPath, func(path string, info os.FileInfo, err error) error {
		if err != nil {
			return err
		}

		// Skip .jade directory
		if info.IsDir() && info.Name() == ".jade" {
			return filepath.SkipDir
		}

		// Only process .md files
		if !info.IsDir() && strings.HasSuffix(info.Name(), ".md") {
			relPath, err := filepath.Rel(jd.Config.DepoPath, path)
			if err != nil {
				return err
			}

			note, err := LoadNote(jd.Config.DepoPath, relPath, jd.Config.TagPrefix)
			if err != nil {
				// Log error but continue
				fmt.Fprintf(os.Stderr, "Warning: failed to load note %s: %v\n", relPath, err)
				return nil
			}

			notes = append(notes, note)
		}

		return nil
	})

	if err != nil {
		return nil, fmt.Errorf("failed to list notes: %w", err)
	}

	return notes, nil
}

// FindNoteByTitle searches for a note by title (fuzzy match)
func (jd *JadeDepo) FindNoteByTitle(title string) ([]*Note, error) {
	allNotes, err := jd.ListAllNotes()
	if err != nil {
		return nil, err
	}

	var matches []*Note
	titleLower := strings.ToLower(title)

	for _, note := range allNotes {
		// Check if title contains the search term
		if strings.Contains(strings.ToLower(note.Title), titleLower) {
			matches = append(matches, note)
		}
	}

	return matches, nil
}