package gitpb

import (
	"bytes"
	"errors"
	"fmt"
	"os"
	"os/exec"
	"path/filepath"
	"strings"

	"github.com/go-cmd/cmd"
	"go.wit.com/lib/gui/shell"
	"go.wit.com/log"
)

// execute something with the working directory
// set to the FullPath
func (repo *Repo) Run(cmd []string) cmd.Status {
	result := shell.PathRun(repo.FullPath, cmd)
	output := strings.Join(result.Stdout, "\n")
	if result.Error != nil {
		log.Log(WARN, "cmd:", cmd)
		log.Log(WARN, "ouptput:", output)
		log.Log(WARN, "failed with error:", result.Error)
	}
	return result
}

func (repo *Repo) RunEcho(cmd []string) cmd.Status {
	result := shell.PathRunQuiet(repo.FullPath, cmd)
	log.Log(NOW, "cmd:", repo.FullPath, cmd)
	log.Warn(WARN, "cmd.Exit:", result.Exit, "cmd.Error:", result.Error)
	for _, line := range result.Stdout {
		log.Log(NOW, "STDOUT:", line)
	}
	for _, line := range result.Stderr {
		log.Log(NOW, "STDERR:", line)
	}
	return result
}

func (repo *Repo) RunRealtime(cmd []string) cmd.Status {
	return shell.PathRunRealtime(repo.GetFullPath(), cmd)
}

func (repo *Repo) RunRealtimeVerbose(cmd []string) cmd.Status {
	log.Log(NOW, "EXEC: cd", repo.GetFullPath(), ";", cmd)
	return shell.PathRunRealtime(repo.GetFullPath(), cmd)
}

func (repo *Repo) RunQuiet(cmd []string) (*cmd.Status, error) {
	result := shell.PathRunQuiet(repo.FullPath, cmd)
	if result.Error != nil {
		log.Warn(repo.GetGoPath(), cmd, "wow. golang is cool. an os.Error:", result.Error)
		return &result, result.Error
	}
	if result.Exit != 0 {
		// log.Warn(cmd, "failed with", result.Exit, repo.GetGoPath())
		return &result, errors.New(fmt.Sprint(cmd, "failed with", result.Exit))
	}
	return &result, nil
}

func (repo *Repo) RunStrict(cmd []string) (*cmd.Status, error) {
	result, err := repo.RunQuiet(cmd)
	if err != nil {
		log.Warn(cmd, "failed with", result.Exit, repo.GetGoPath())
		return result, errors.New(fmt.Sprint(cmd, "failed with", result.Exit))
	}
	return result, nil
}

func (repo *Repo) Exists(filename string) bool {
	if repo == nil {
		return false
	}
	testf := filepath.Join(repo.FullPath, filename)
	_, err := os.Stat(testf)
	if err != nil {
		return false
	}
	return true
}

func (repo *Repo) IsValidDir() bool {
	if repo == nil {
		return false
	}
	if !repo.IsGitDirectory() {
		return false
	}
	return true
}

func (repo *Repo) ReadFile(fname string) ([]byte, error) {
	fullname := filepath.Join(repo.FullPath, fname)
	return os.ReadFile(fullname)
}

func (repo *Repo) IsGitDirectory() bool {
	gitdir := filepath.Join(repo.FullPath, ".git")
	info, err := os.Stat(gitdir)
	if err != nil {
		return false
	}
	return info.IsDir()
}

func (repo *Repo) IsDirectory() bool {
	info, err := os.Stat(repo.FullPath)
	if err != nil {
		return false
	}
	return info.IsDir()
}

func (repo *Repo) RunAll(all [][]string) bool {
	for _, cmd := range all {
		log.Log(WARN, "doAll() RUNNING: cmd =", cmd)
		r := repo.Run(cmd)
		if r.Error != nil {
			log.Log(WARN, "doAll() err =", r.Error)
			log.Log(WARN, "doAll() out =", r.Stdout)
			return false
		}
	}
	return true
}

func (repo *Repo) RunStrictAll(all [][]string) (*cmd.Status, error) {
	for _, cmd := range all {
		log.Log(WARN, "doAll() RUNNING: cmd =", cmd)
		if result, err := repo.RunStrict(cmd); err != nil {
			return result, err
		}
	}
	return nil, nil
}

func (repo *Repo) RunVerbose(cmd []string) error {
	// log.Info("EXEC Running:", repo.GetGoPath(), cmd)
	err := shell.PathExecVerbose(repo.GetFullPath(), cmd)
	if err != nil {
		log.Info("Error", cmd, err)
		return err
	}
	return nil
}

func (repo *Repo) RunVerboseOnError(cmd []string) (*cmd.Status, error) {
	r, err := repo.RunStrict(cmd)
	if err == nil {
		return r, err
	}
	log.Info("Run Error:", repo.GetGoPath(), cmd, err)
	for _, line := range r.Stdout {
		log.Info(line)
	}
	for _, line := range r.Stderr {
		log.Info(line)
	}
	return r, err
}

// only safe to run len() on STDOUT
// DO NOT TRY TO PARSE THIS EXCEPT HASH AS FIRST VALUE
// Intended to be human readable
func (repo *Repo) ConstructGitDiffLog(branch1, branch2 string) []string {
	var cmd []string
	cmd = append(cmd, "git")
	cmd = append(cmd, "log")
	cmd = append(cmd, "--format=\"%H %ae %as %s\"")
	cmd = append(cmd, branch1)
	cmd = append(cmd, "--not")
	cmd = append(cmd, branch2)
	return cmd
}

// count all objects only in branch1
func (repo *Repo) CountDiffObjects(branch1, branch2 string) int {
	cmd := repo.ConstructGitDiffLog(branch1, branch2)
	r, err := repo.RunVerboseOnError(cmd)
	if err != nil {
		return -1
	}
	// log.Info("countDiffObjects()", cmd, len(r.Stdout), strings.Join(r.Stdout, " "))
	return len(r.Stdout)
}

func (repo *Repo) RunPipe(cmd1 []string, cmd2 []string) cmd.Status {
	var s cmd.Status
	var arg0 string
	var args []string
	if len(cmd1) == 0 {
		s.Error = errors.New("Error: Command slice is empty.")
		return s
	}
	if len(cmd1) == 1 {
		// Pass the first element as the command, and the rest as variadic arguments
		arg0 = cmd1[0]
	} else {
		arg0 = cmd1[0]
		args = cmd1[1:]
	}
	cmdShow := exec.Command(arg0, args...)
	cmdShow.Dir = repo.GetFullPath()

	if len(cmd2) == 0 {
		s.Error = errors.New("Error: Command slice is empty.")
		return s
	}
	if len(cmd2) == 1 {
		// Pass the first element as the command, and the rest as variadic arguments
		arg0 = cmd2[0]
	} else {
		arg0 = cmd2[0]
		args = cmd2[1:]
	}
	// 2. Create the command to calculate the patch-id from stdin.
	cmdPipeID := exec.Command(arg0, args...)
	cmdPipeID.Dir = repo.GetFullPath()

	// 3. Connect the output of "git show" to the input of "git patch-id".
	//    This is the Go equivalent of the shell pipe `|`.
	pipe, err := cmdShow.StdoutPipe()
	if err != nil {
		s.Error = fmt.Errorf("failed to create pipe: %w", err)
		return s
	}
	cmdPipeID.Stdin = pipe

	// 4. We need a buffer to capture the final output from git patch-id.
	var output bytes.Buffer
	cmdPipeID.Stdout = &output

	// 5. Start the reading command (patch-id) first.
	if err := cmdPipeID.Start(); err != nil {
		s.Error = fmt.Errorf("failed to start git-patch-id: %w", err)
		return s
	}

	// 6. Run the writing command (show). This will block until it's done.
	if err := cmdShow.Run(); err != nil {
		s.Error = fmt.Errorf("failed to run git-show: %w", err)
		return s
	}

	// 7. Wait for the reading command to finish.
	if err := cmdPipeID.Wait(); err != nil {
		s.Error = fmt.Errorf("failed to wait for git-patch-id: %w", err)
		return s
	}

	return s
}