package ui

import (
	"fmt"
	"os"
	"os/exec"
	"strings"
	"time"

	gemlog "git.travisshears.com/travisshears/gemlog-cli/gemlog"
	tea "github.com/charmbracelet/bubbletea"
	"gopkg.in/yaml.v3"
)

// TODO: add edit command
// func EditPostCMD(config *gemlog.Config) tea.Cmd {}

func WritePostCMD(config *gemlog.Config) tea.Cmd {
	return func() tea.Msg {
		// Create a temporary file
		tmpFile, err := os.CreateTemp("/tmp", "gemlog-*.md")
		if err != nil {
			return ErrorMsg{fmt.Errorf("failed to create temporary file: %w", err)}
		}

		// Load initial content from template file
		initialContent, err := os.ReadFile("templates/default_post.gmi")
		if err != nil {
			tmpFile.Close()
			os.Remove(tmpFile.Name())
			return ErrorMsg{fmt.Errorf("failed to read template file: %w", err)}
		}

		if _, err := tmpFile.Write(initialContent); err != nil {
			tmpFile.Close()
			os.Remove(tmpFile.Name())
			return ErrorMsg{fmt.Errorf("failed to write initial content: %w", err)}
		}
		tmpFile.Close()

		// Get the editor from environment variable, default to vim
		editor := os.Getenv("EDITOR")
		if editor == "" {
			editor = "vim"
		}

		// Create the command to open the editor with the temp file
		c := exec.Command(editor, tmpFile.Name()) //nolint:gosec

		// Return tea.ExecProcess which will suspend the TUI and run the editor
		return tea.ExecProcess(c, func(err error) tea.Msg {
			defer os.Remove(tmpFile.Name()) // Clean up the temp file

			if err != nil {
				return ErrorMsg{fmt.Errorf("editor command failed: %w", err)}
			}

			// Read the contents of the file after editing
			content, readErr := os.ReadFile(tmpFile.Name())
			if readErr != nil {
				return ErrorMsg{fmt.Errorf("failed to read file contents: %w", readErr)}
			}

			gemlogEntry, err := parsePost(string(content))
			if err != nil {
				return ErrorMsg{fmt.Errorf("failed to parse post: %w", err)}
			}
			if err := gemlog.SaveGemlogEntry(config, &gemlogEntry); err != nil {
				return ErrorMsg{fmt.Errorf("failed to save gemlog entry: %w", err)}
			}

			// Return success with the content
			return Notification(fmt.Sprintf("Post created: \ngemini://travisshears.com/gemlog/%s\n\n", gemlogEntry.Slug))
		})()
	}
}

func parsePost(post string) (gemlog.GemlogEntry, error) {
	// split post on new lines
	lines := strings.Split(post, "\n")

	// Find the separator line "---"
	separatorIndex := -1
	for i, line := range lines {
		if strings.TrimSpace(line) == "---" {
			separatorIndex = i
			break
		}
	}

	if separatorIndex == -1 {
		return gemlog.GemlogEntry{}, fmt.Errorf("no frontmatter separator '---' found")
	}

	// Extract frontmatter and body
	frontmatterLines := lines[:separatorIndex]
	bodyLines := lines[separatorIndex+1:]

	// Parse frontmatter YAML
	frontmatterYAML := strings.Join(frontmatterLines, "\n")

	var frontmatter struct {
		Title string `yaml:"title"`
		Date  string `yaml:"date"`
		Slug  string `yaml:"slug"`
		Tags  string `yaml:"tags"`
	}

	if err := yaml.Unmarshal([]byte(frontmatterYAML), &frontmatter); err != nil {
		return gemlog.GemlogEntry{}, fmt.Errorf("failed to parse frontmatter: %w", err)
	}

	// Parse date
	date, err := time.Parse("2006-01-02", strings.TrimSpace(frontmatter.Date))
	if err != nil {
		return gemlog.GemlogEntry{}, fmt.Errorf("failed to parse date: %w", err)
	}

	// Parse tags (comma-separated)
	var tags []string
	if frontmatter.Tags != "" {
		tagParts := strings.Split(frontmatter.Tags, ",")
		for _, tag := range tagParts {
			trimmed := strings.TrimSpace(tag)
			if trimmed != "" {
				tags = append(tags, trimmed)
			}
		}
	}

	// Join body lines
	body := strings.Join(bodyLines, "\n")

	return gemlog.GemlogEntry{
		Title:  frontmatter.Title,
		Date:   date,
		Slug:   frontmatter.Slug,
		Tags:   tags,
		Gemtxt: body,
	}, nil
}