package main

import (
	"errors"
	"fmt"
	"html/template"
	"io"
	"io/ioutil"
	"os"
	"os/exec"
	"path/filepath"
	"strings"
)

func generateContentType(name, path string) error {
	fileName := strings.ToLower(name) + ".go"
	typeName := strings.ToUpper(string(name[0])) + string(name[1:])

	// contain processed name an info for template
	data := map[string]string{
		"name":    typeName,
		"initial": string(fileName[0]),
	}

	// open file in ./content/ dir
	// if exists, alert user of conflict
	pwd, err := os.Getwd()
	if err != nil {
		return err
	}

	if path != "" {
		pwd = path
	}

	contentDir := filepath.Join(pwd, "content")
	filePath := filepath.Join(contentDir, fileName)

	if _, err := os.Stat(filePath); !os.IsNotExist(err) {
		return fmt.Errorf("Please remove '%s' before executing this command.", fileName)
	}

	// no file exists.. ok to write new one
	file, err := os.Create(filePath)
	defer file.Close()
	if err != nil {
		return err
	}

	// execute template
	tmpl := template.Must(template.New("content").Parse(contentTypeTmpl))
	err = tmpl.Execute(file, data)
	if err != nil {
		return err
	}

	return nil
}

const contentTypeTmpl = `
package content

import (
	"fmt"

	"github.com/bosssauce/ponzu/management/editor"
)

// {{ .name }} is the generic content struct
type {{ .name }} struct {
	Item
	editor editor.Editor

    // required: all maintained {{ .name }} fields must have json tags!
	Title      string ` + "`json:" + `"title"` + "`" + `
	Content    string ` + "`json:" + `"content"` + "`" + `
	Author     string ` + "`json:" + `"author"` + "`" + `
	Picture    string ` + "`json:" + `"picture"` + "`" + `	
	Category   []string ` + "`json:" + `"category"` + "`" + `
	ThemeStyle string ` + "`json:" + `"theme"` + "`" + `
}

func init() {
	Types["{{ .name }}"] = func() interface{} { return new({{ .name }}) }
}

// SetContentID partially implements editor.Editable
func ({{ .initial }} *{{ .name }}) SetContentID(id int) { {{ .initial }}.ID = id }

// ContentID partially implements editor.Editable
func ({{ .initial }} *{{ .name }}) ContentID() int { return {{ .initial }}.ID }

// ContentName partially implements editor.Editable
func ({{ .initial }} *{{ .name }}) ContentName() string { return {{ .initial }}.Title }

// SetSlug partially implements editor.Editable
func ({{ .initial }} *{{ .name }}) SetSlug(slug string) { {{ .initial }}.Slug = slug }

// Editor partially implements editor.Editable
func ({{ .initial }} *{{ .name }}) Editor() *editor.Editor { return &{{ .initial }}.editor }

// MarshalEditor writes a buffer of html to edit a {{ .name }} and partially implements editor.Editable
func ({{ .initial }} *{{ .name }}) MarshalEditor() ([]byte, error) {
/* EXAMPLE CODE (from post.go, the default content type) */
	view, err := editor.Form({{ .initial }},
		editor.Field{
			// Take careful note that the first argument to these Input-like methods 
            // is the string version of each {{ .name }} struct tag, and must follow this pattern
            // for auto-decoding and -encoding reasons.
			View: editor.Input("Title", {{ .initial }}, map[string]string{
				"label":       "{{ .name }} Title",
				"type":        "text",
				"placeholder": "Enter your {{ .name }} Title here",
			}),
		},
		editor.Field{
			View: editor.Richtext("Content", {{ .initial }}, map[string]string{
				"label":       "Content",
				"placeholder": "Add the content of your {{ .name }} here",
			}),
		},
		editor.Field{
			View: editor.Input("Author", {{ .initial }}, map[string]string{
				"label":       "Author",
				"type":        "text",
				"placeholder": "Enter the author name here",
			}),
		},
		editor.Field{
			View: editor.File("Picture", {{ .initial }}, map[string]string{
				"label":       "Author Photo",
				"placeholder": "Upload a profile picture for the author",
			}),
		},
		editor.Field{
			View: editor.Checkbox("Category", {{ .initial }}, map[string]string{
				"label": "{{ .name }} Category",
			}, map[string]string{
				"important": "Important",
				"active":    "Active",
				"unplanned": "Unplanned",
			}),
		},
		editor.Field{
			View: editor.Select("ThemeStyle", {{ .initial }}, map[string]string{
				"label": "Theme Style",
			}, map[string]string{
				"dark": "Dark",
				"light": "Light",
			}),
		},
	)

	if err != nil {
		return nil, fmt.Errorf("Failed to render {{ .name }} editor view: %s", err.Error())
	}

	return view, nil
}
`

func newProjectInDir(path string) error {
	// set path to be nested inside $GOPATH/src
	gopath := os.Getenv("GOPATH")
	path = filepath.Join(gopath, "src", path)

	// check if anything exists at the path, ask if it should be overwritten
	if _, err := os.Stat(path); !os.IsNotExist(err) {
		fmt.Println("Path exists, overwrite contents? (y/N):")
		// input := bufio.NewReader(os.Stdin)
		// answer, err := input.ReadString('\n')

		var answer string
		_, err := fmt.Scanf("%s\n", &answer)
		if err != nil {
			return err
		}

		answer = strings.ToLower(answer)

		switch answer {
		case "n", "no", "":
			fmt.Println("")

		case "y", "yes":
			err := os.RemoveAll(path)
			if err != nil {
				return fmt.Errorf("Failed to overwrite %s. \n%s", path, err)
			}

			return createProjInDir(path)

		default:
			fmt.Println("Input not recognized. No files overwritten. Answer as 'y' or 'n' only.")
		}

		return nil
	}

	return createProjInDir(path)
}

var ponzuRepo = []string{"github.com", "bosssauce", "ponzu"}

func createProjInDir(path string) error {
	gopath := os.Getenv("GOPATH")
	repo := ponzuRepo
	local := filepath.Join(gopath, "src", filepath.Join(repo...))
	network := "https://" + strings.Join(repo, "/") + ".git"

	// create the directory or overwrite it
	err := os.MkdirAll(path, os.ModeDir|os.ModePerm)
	if err != nil {
		return err
	}

	if dev {
		devClone := exec.Command("git", "clone", local, "--branch", "ponzu-dev", "--single-branch", path)
		devClone.Stdout = os.Stdout
		devClone.Stderr = os.Stderr

		err := devClone.Start()
		if err != nil {
			return err
		}

		err = devClone.Wait()
		if err != nil {
			return err
		}

		err = vendorCorePackages(path)
		if err != nil {
			return err
		}

		err = generateContentType("post", path)
		if err != nil {
			// TODO: rollback, remove ponzu project from path
			return err
		}

		fmt.Println("Dev build cloned from bosssauce/ponzu:ponzu-dev")
		return nil
	}

	// try to git clone the repository from the local machine's $GOPATH
	localClone := exec.Command("git", "clone", local, path)
	localClone.Stdout = os.Stdout
	localClone.Stderr = os.Stderr

	err = localClone.Start()
	if err != nil {
		return err
	}
	err = localClone.Wait()
	if err != nil {
		fmt.Println("Couldn't clone from", local, ". Trying network...")

		// try to git clone the repository over the network
		networkClone := exec.Command("git", "clone", network, path)
		networkClone.Stdout = os.Stdout
		networkClone.Stderr = os.Stderr

		err = networkClone.Start()
		if err != nil {
			fmt.Println("Network clone failed to start. Try again and make sure you have a network connection.")
			return err
		}
		err = networkClone.Wait()
		if err != nil {
			fmt.Println("Network clone failure.")
			// failed
			return fmt.Errorf("Failed to clone files from local machine [%s] and over the network [%s].\n%s", local, network, err)
		}
	}

	// create a 'vendor' directory in $path/cmd/ponzu and move 'content',
	// 'management' and 'system' packages into it
	err = vendorCorePackages(path)
	if err != nil {
		return err
	}

	err = generateContentType("post", path)
	if err != nil {
		// TODO: rollback, remove ponzu project from path
		return err
	}

	fmt.Println("New ponzu project created at", path)
	return nil
}

func vendorCorePackages(path string) error {
	vendorPath := filepath.Join(path, "cmd", "ponzu", "vendor", "github.com", "bosssauce", "ponzu")
	err := os.MkdirAll(vendorPath, os.ModeDir|os.ModePerm)
	if err != nil {
		// TODO: rollback, remove ponzu project from path
		return err
	}

	dirs := []string{"content", "management", "system"}
	for _, dir := range dirs {
		err = os.Rename(filepath.Join(path, dir), filepath.Join(vendorPath, dir))
		if err != nil {
			// TODO: rollback, remove ponzu project from path
			return err
		}
	}

	// create a user 'content' package, and give it a single 'post.go' file
	// using generateContentType("post")
	contentPath := filepath.Join(path, "content")
	err = os.Mkdir(contentPath, os.ModeDir|os.ModePerm)
	if err != nil {
		// TODO: rollback, remove ponzu project from path
		return err
	}

	return nil
}

func buildPonzuServer(args []string) error {
	// copy all ./content .go files to $vendor/content
	// check to see if any file exists, move on to next file if so,
	// and report this conflict to user for them to fix & re-run build
	pwd, err := os.Getwd()
	if err != nil {
		return err
	}

	contentSrcPath := filepath.Join(pwd, "content")
	contentDstPath := filepath.Join(pwd, "cmd", "ponzu", "vendor", "github.com", "bosssauce", "ponzu", "content")

	srcFiles, err := ioutil.ReadDir(contentSrcPath)
	if err != nil {
		return err
	}

	var conflictFiles = []string{"item.go", "types.go"}
	var mustRenameFiles = []string{}
	for _, srcFileInfo := range srcFiles {
		// check srcFile exists in contentDstPath
		for _, conflict := range conflictFiles {
			if srcFileInfo.Name() == conflict {
				mustRenameFiles = append(mustRenameFiles, conflict)
				continue
			}
		}

		dstFile, err := os.Create(filepath.Join(contentDstPath, srcFileInfo.Name()))
		if err != nil {
			return err
		}

		srcFile, err := os.Open(filepath.Join(contentSrcPath, srcFileInfo.Name()))
		if err != nil {
			return err
		}

		_, err = io.Copy(dstFile, srcFile)
		if err != nil {
			return err
		}
	}

	if len(mustRenameFiles) > 1 {
		fmt.Println("Ponzu couldn't fully build your project:")
		fmt.Println("Some of your files in the content directory exist in the vendored directory.")
		fmt.Println("You must rename the following files, as they conflict with Ponzu core:")
		for _, file := range mustRenameFiles {
			fmt.Println(file)
		}

		fmt.Println("Once the files above have been renamed, run '$ ponzu build' to retry.")
		return errors.New("Ponzu has very few internal conflicts, sorry for the inconvenience.")
	}

	// execute go build -o ponzu-cms cmd/ponzu/*.go
	mainPath := filepath.Join(pwd, "cmd", "ponzu", "main.go")
	optsPath := filepath.Join(pwd, "cmd", "ponzu", "options.go")
	build := exec.Command("go", "build", "-o", "ponzu-server", mainPath, optsPath)
	build.Stderr = os.Stderr
	build.Stdout = os.Stdout

	err = build.Start()
	if err != nil {
		return errors.New("Ponzu build step failed. Please try again. " + "\n" + err.Error())

	}
	err = build.Wait()
	if err != nil {
		return errors.New("Ponzu build step failed. Please try again. " + "\n" + err.Error())

	}

	return nil
}