//go:build ignore

package main

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

type Colors struct {
	Mode string `json:"mode"`
}

type ThemeDefinition struct {
	Colors Colors `json:"colors"`
	Id     string `json:"id"`
}

func main() {
	themesPath := filepath.Join("..", "..", "..", "packages", "grafana-data", "src", "themes", "themeDefinitions")

	// Check if the themes directory exists
	if _, err := os.Stat(themesPath); os.IsNotExist(err) {
		fmt.Fprintf(os.Stderr, "Themes directory not found: %s\n", themesPath)
		os.Exit(1)
	}

	output := `// Code generated by go generate; DO NOT EDIT.

package pref

var themes = []ThemeDTO{
	{ID: "light", Type: "light"},
	{ID: "dark", Type: "dark"},
	{ID: "system", Type: "dark"},
`

	err := filepath.WalkDir(themesPath, func(path string, d os.DirEntry, err error) error {
		if err != nil {
			return err
		}

		// Only process json files
		if d.IsDir() || !strings.HasSuffix(d.Name(), ".json") {
			return nil
		}

		fileBytes, readErr := os.ReadFile(path)
		if readErr != nil {
			fmt.Fprintf(os.Stderr, "Error reading file %s: %v\n", path, readErr)
			return nil // Continue processing other files
		}

		var themeDef ThemeDefinition
		jsonErr := json.Unmarshal(fileBytes, &themeDef)
		if jsonErr != nil {
			fmt.Fprintf(os.Stderr, "Error parsing JSON from %s: %v\n", path, jsonErr)
			return nil // Continue processing other files
		}

		themeId := themeDef.Id
		themeType := "dark" // default fallback
		if themeDef.Colors.Mode != "" {
			themeType = themeDef.Colors.Mode
		}

		output += fmt.Sprintf("\t{ID: %q, Type: %q, IsExtra: true},\n", themeId, themeType)

		return nil
	})

	if err != nil {
		fmt.Fprintf(os.Stderr, "Error walking themes directory: %v\n", err)
		os.Exit(1)
	}

	output += "}\n"

	// Write the generated file
	outputPath := filepath.Join("themes_generated.go")
	if err := os.WriteFile(outputPath, []byte(output), 0644); err != nil {
		fmt.Fprintf(os.Stderr, "Error writing output file: %v\n", err)
		os.Exit(1)
	}

	fmt.Printf("Successfully generated themes_generated.go\n")
}