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package cmd

import (
	"bytes"
	"errors"
	"fmt"
	"io/fs"
	"os"
	"os/exec"
	"path/filepath"

	"github.com/urfave/cli/v2"
)

var Init = &cli.Command{
	Name:        "init",
	Aliases:     []string{"i"},
	Description: "Initialize git-age",
	Action:      actionInit,
}

func actionInit(ctx *cli.Context) error {
	exe, err := os.Executable()
	if err != nil {
		return fmt.Errorf("could not get path to executable: %w", err)
	}
	var debugFlag string
	if debug {
		debugFlag = " -d"
	}
	if _, err := cmd("git", "config", "filter.git-age.required", "true"); err != nil {
		return err
	}
	if _, err := cmd("git", "config", "filter.git-age.smudge", exe+debugFlag+" smudge -f %f"); err != nil {
		return err
	}
	if _, err := cmd("git", "config", "filter.git-age.clean", exe+debugFlag+" clean -f %f"); err != nil {
		return err
	}
	if _, err := cmd("git", "config", "diff.git-age.textconv", exe+debugFlag+" textconv"); err != nil {
		return err
	}

	cfg, err := LoadConfig()
	if err != nil {
		if errors.Is(err, fs.ErrNotExist) {
			return nil
		}
		return err
	}
	dir, err := gitBaseDir()
	if err != nil {
		return err
	}

	for file := range cfg {
		apn := filepath.Join(dir, file)
		args := []string{"smudge", "-f", file}
		if debug {
			args = append([]string{"-d"}, args...)
		}
		if err := func() error {
			content, err := os.ReadFile(apn)
			if err != nil {
				return err
			}

			var buf bytes.Buffer
			c := exec.Command(exe, args...)
			c.Stdin = bytes.NewReader(content)
			c.Stdout = &buf
			if debug {
				c.Stderr = os.Stderr
			}
			if err := c.Run(); err != nil {
				if debug {
					fmt.Fprintf(os.Stderr, "could not smudge file: %v\n", err)
				}
				return nil
			}

			fi, err := os.Create(apn)
			if err != nil {
				return err
			}
			fi.Write(buf.Bytes())
			if err := fi.Close(); err != nil {
				return err
			}
			cmd("git", "add", "--renormalize", apn)

			return nil
		}(); err != nil {
			return err
		}
	}

	return nil
}