package forgejo

import (
	"bytes"
	"encoding/json"
	"fmt"
	"net/http"
	"os"
	"os/exec"
	"path/filepath"
	"strings"
	"time"

	"github.com/Pingu-Studio/MaidnCLI/internal/utils"
)

type RepoManager struct {
	BaseURL           string
	Token             string
	Owner             string
	Username          string
	ManifestsRepoName string
	FluxRepoName      string
}

type createRepoRequest struct {
	Name        string `json:"name"`
	Description string `json:"description"`
	Private     bool   `json:"private"`
	AutoInit    bool   `json:"auto_init"`
}

func NewRepoManager(baseURL, token, owner, username, manifestsRepo, fluxRepo string) *RepoManager {
	return &RepoManager{
		BaseURL:           strings.TrimRight(baseURL, "/"),
		Token:             token,
		Owner:             owner,
		Username:          username,
		ManifestsRepoName: manifestsRepo,
		FluxRepoName:      fluxRepo,
	}
}

func (rm *RepoManager) InitializeAll(createRepo func(string) error, createFlux func(string) error) error {
	if err := rm.ensureRepo(rm.ManifestsRepoName, "Centralized deployment manifests for Flux CD", createRepo); err != nil {
		return err
	}
	if err := rm.ensureRepo(rm.FluxRepoName, "Flux CD cluster configurations", createFlux); err != nil {
		return err
	}
	return nil
}

func (rm *RepoManager) ensureRepo(name, description string, createStructure func(string) error) error {
	repoURL := fmt.Sprintf("%s/%s/%s.git", rm.BaseURL, rm.Owner, name)
	apiURL := fmt.Sprintf("%s/api/v1/repos/%s/%s", rm.BaseURL, rm.Owner, name)
	if err := rm.apiRequest(http.MethodGet, apiURL, nil); err != nil {
		createURL := fmt.Sprintf("%s/api/v1/orgs/%s/repos", rm.BaseURL, rm.Owner)
		if rm.Owner == rm.Username {
			createURL = fmt.Sprintf("%s/api/v1/user/repos", rm.BaseURL)
		}
		body, _ := json.Marshal(createRepoRequest{Name: name, Description: description, Private: true, AutoInit: true})
		if apiErr := rm.apiRequest(http.MethodPost, createURL, body); apiErr != nil {
			return apiErr
		}
	}
	return rm.setupRepository(repoURL, name, createStructure)
}

func (rm *RepoManager) setupRepository(repoURL, repoName string, createStructure func(string) error) error {
	tempDir, err := os.MkdirTemp("", "repo-setup-*")
	if err != nil {
		return err
	}
	defer os.RemoveAll(tempDir)
	if err := utils.RunCommand("git", "clone", repoURL, tempDir); err != nil {
		return err
	}
	if err := createStructure(tempDir); err != nil {
		return err
	}
	return commitAndPush(tempDir, repoName)
}

func commitAndPush(tempDir, repoName string) error {
	utils.RunCommandInDir(tempDir, "git", "config", "user.name", "Maidn")
	utils.RunCommandInDir(tempDir, "git", "config", "user.email", "maidn@free-maidn.com")
	utils.RunCommandInDir(tempDir, "git", "add", ".")
	statusCmd := exec.Command("git", "status", "--porcelain")
	statusCmd.Dir = tempDir
	output, _ := statusCmd.Output()
	if len(output) == 0 {
		return nil
	}
	if err := utils.RunCommandInDir(tempDir, "git", "commit", "-m", "feat: initialize repository structure for CI/CD"); err != nil {
		return err
	}
	if err := utils.RunCommandInDir(tempDir, "git", "push", "origin", "main"); err != nil {
		return err
	}
	fmt.Printf("[SUCCESS] Changes pushed to %s successfully.\n", repoName)
	return nil
}

func (rm *RepoManager) apiRequest(method, endpoint string, body []byte) error {
	client := http.Client{Timeout: 15 * time.Second}
	request, err := http.NewRequest(method, endpoint, bytes.NewReader(body))
	if err != nil {
		return err
	}
	request.Header.Set("Authorization", "token "+rm.Token)
	request.Header.Set("Content-Type", "application/json")
	response, err := client.Do(request)
	if err != nil {
		return err
	}
	defer response.Body.Close()
	if response.StatusCode >= 300 {
		return fmt.Errorf("forgejo returned %s for %s", response.Status, endpoint)
	}
	return nil
}

func FluxSourceURL(baseURL, owner, repo string) string {
	return fmt.Sprintf("%s/%s/%s.git", strings.TrimRight(baseURL, "/"), owner, repo)
}

func CloneURL(baseURL, owner, repo string) string {
	return fmt.Sprintf("%s/%s/%s.git", strings.TrimRight(baseURL, "/"), owner, repo)
}

func RepoPath(parent, dirName string) string {
	return filepath.Join(parent, dirName)
}