package cmd

import (
	"fmt"
	"log/slog"
	"os"
	"path"
	"regexp"
	"sort"
	"strings"
	"text/template"

	"github.com/spf13/cobra"
	"tf-provider.git.onstackit.cloud/stackit-dev-tools/terraform-provider-stackitprivatepreview/generator/cmd/tools"
)

var outFile string

var docsCmd = &cobra.Command{
	Use:   "docs",
	Short: "handle documentation",
	Long:  `...`,
	RunE: func(_ *cobra.Command, _ []string) error {
		// filePathStr := "stackit/internal/services/postgresflexalpha/database/datasources_gen/database_data_source_gen.go"
		//
		// src, err := os.ReadFile(filePathStr)
		// if err != nil {
		//	return err
		//}
		//
		// i := interp.New(
		//	interp.Options{
		//		GoPath:               "/home/henselinm/.asdf/installs/golang/1.25.6/packages",
		//		BuildTags:            nil,
		//		Stdin:                nil,
		//		Stdout:               nil,
		//		Stderr:               nil,
		//		Args:                 nil,
		//		Env:                  nil,
		//		SourcecodeFilesystem: nil,
		//		Unrestricted:         false,
		//	},
		//)
		// err = i.Use(i.Symbols("github.com/hashicorp/terraform-plugin-framework-validators"))
		// if err != nil {
		//	return err
		//}
		// err = i.Use(stdlib.Symbols)
		// if err != nil {
		//	return err
		//}
		// _, err = i.Eval(string(src))
		// if err != nil {
		//	return err
		//}
		//
		// v, err := i.Eval("DatabaseDataSourceSchema")
		// if err != nil {
		//	return err
		//}
		//
		// bar := v.Interface().(func(string) string)
		//
		// r := bar("Kung")
		// println(r)
		//
		// evalPath, err := i.EvalPath(filePathStr)
		// if err != nil {
		//	return err
		//}
		//
		// fmt.Printf("%+v\n", evalPath)

		// _, err = i.Eval(`import "fmt"`)
		// if err != nil {
		//	return err
		//}
		// _, err = i.Eval(`func Hallo() { fmt.Println("Hi!") }`)
		// if err != nil {
		//	return err
		//}

		// v = i.Symbols("Hallo")

		// fmt.Println(v)
		return workDocs()
	},
}

type NavDocs struct {
	PageTitle       string
	Description     string
	NavigationTitle string
	ProviderTitle   string
	IndexFound      bool
	Services        []Service
}

type Service struct {
	ServiceTitle string
	DataSources  []ResItem
	Resources    []ResItem
}

type ResItem struct {
	ItemName string
	ItemLink string
}

func workDocs() error {
	slog.Info("creating docs navigation")
	root, err := tools.GetGitRoot()
	if err != nil {
		slog.Error("ERROR", "err", err)
		return err
	}

	nav := NavDocs{
		PageTitle:       "STACKIT terraform provider PRIVATE-PREVIEW",
		Description:     "",
		NavigationTitle: "Navigation",
		ProviderTitle:   "Provider",
		IndexFound:      false,
	}
	startPath := path.Join(root, "docs")

	docs, err := os.ReadDir(startPath)
	if err != nil {
		return err
	}

	services := make(map[string]Service)
	dataSources := make(map[string][]ResItem)
	resources := make(map[string][]ResItem)

	for _, entry := range docs {
		if !entry.IsDir() {
			if entry.Name() == "index.md" {
				slog.Debug("  found provider index file")
				nav.IndexFound = true
				continue
			}
			slog.Debug("  found am ignored file", "fileName", entry.Name())
			continue
		}

		if entry.Name() != "data-sources" && entry.Name() != "resources" {
			slog.Error("unable to handle entry, skipping", "entry", entry.Name())
			continue
		}

		elements, err := os.ReadDir(path.Join(startPath, entry.Name()))
		if err != nil {
			return err
		}
		for _, res := range elements {
			if res.IsDir() {
				slog.Warn("found unexpected directory", "dir", res.Name())
				continue
			}

			re := regexp.MustCompile(`([a-z]+)_([a-z]+).md`)
			matches := re.FindAllStringSubmatch(res.Name(), -1)
			if matches == nil {
				slog.Error("unable to identify resource", "item", res.Name())
				continue
			}
			services[matches[0][1]] = Service{
				ServiceTitle: matches[0][1],
			}
			switch entry.Name() {
			case "data-sources":
				dataSources[matches[0][1]] = append(dataSources[matches[0][1]], ResItem{
					ItemName: matches[0][2],
					ItemLink: fmt.Sprintf("docs/%s/%s", entry.Name(), matches[0][0]),
				})
			case "resources":
				resources[matches[0][1]] = append(resources[matches[0][1]], ResItem{
					ItemName: matches[0][2],
					ItemLink: fmt.Sprintf("docs/%s/%s", entry.Name(), matches[0][0]),
				})
			default:
				return fmt.Errorf("this should never have happened")
			}
		}

	}

	keys := make([]string, 0, len(services))
	for k := range services {
		keys = append(keys, k)
	}
	sort.Strings(keys)

	for _, name := range keys {
		item := services[name]
		item.DataSources = dataSources[name]
		item.Resources = resources[name]
		nav.Services = append(nav.Services, item)
	}

	fn := template.FuncMap{
		"ucfirst": ucfirst,
	}

	tmpl, err := template.
		New("nav.md.gompl").
		Funcs(fn).
		ParseFiles(path.Join(root, "generator", "cmd", "docs", "templates", "nav.md.gompl"))
	if err != nil {
		return err
	}

	var f *os.File
	f, err = os.Create(outFile)
	if err != nil {
		return err
	}

	err = tmpl.Execute(f, nav)
	if err != nil {
		return err
	}

	err = f.Close()
	if err != nil {
		return err
	}

	slog.Info("finished")
	return nil
}

func NewDocsCmd() *cobra.Command {
	return docsCmd
}

func ucfirst(s string) string {
	if s == "" {
		return ""
	}
	return strings.ToUpper(s[:1]) + s[1:]
}

func init() { // nolint: gochecknoinits
	docsCmd.Flags().StringVarP(&outFile, "outFile", "o", "nav.md", "nav.md")
}