package bootstrap

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

	"github.com/Pingu-Studio/MaidnCLI/internal/config"
	"github.com/Pingu-Studio/MaidnCLI/internal/forgejo"
)

type FreshOrganizationOptions struct {
	Organization       string
	CreateOrganization bool
	EnableDelivery     bool
	Mode               Mode
	ConfirmRebuild     bool
}

type FreshOrganizationPlan struct {
	Phases []string
}

var ensureFreshTemplateRevisions = EnsureTemplateRevisions
var newFreshRepoManager = forgejo.NewRepoManager
var runFreshLifecycle = reconcileFreshOrganization

// PlanFreshOrganization validates the fresh, reversible setup phases before
// any Forgejo or Git boundary is reached.
func PlanFreshOrganization(cfg config.Config, options FreshOrganizationOptions) (config.Config, FreshOrganizationPlan, error) {
	mode, err := resolveLifecycleMode(options.Mode, options.ConfirmRebuild)
	if err != nil {
		return cfg, FreshOrganizationPlan{}, err
	}
	resolved, err := config.ResolveFreshBootstrap(cfg, options.Organization, options.EnableDelivery)
	if err != nil {
		return cfg, FreshOrganizationPlan{}, err
	}
	if !options.CreateOrganization {
		return cfg, FreshOrganizationPlan{}, errors.New("--create-organization is required for fresh organization bootstrap")
	}
	if err := validateFreshWorkspace(resolved); err != nil {
		return cfg, FreshOrganizationPlan{}, err
	}
	phases := []string{
		"validate isolated workspace and configuration",
		"lock template revisions in the isolated workspace",
		"ensure the Forgejo organization",
		"ensure baseline Flux and manifests repositories",
	}
	phases = append(phases, "initialize the user-managed Tekton catalog repository")
	phases = append(phases, fmt.Sprintf("%s the CI/CD cluster", mode))
	return resolved, FreshOrganizationPlan{Phases: phases}, nil
}

// RunFreshOrganization completes a fresh bootstrap through the selected lifecycle.
func RunFreshOrganization(cfg config.Config, options FreshOrganizationOptions) (FreshOrganizationPlan, error) {
	resolved, plan, err := PlanFreshOrganization(cfg, options)
	if err != nil {
		return FreshOrganizationPlan{}, err
	}
	if err := ensureFreshTemplateRevisions(resolved); err != nil {
		return plan, fmt.Errorf("lock template revisions: %w", err)
	}
	manager := newFreshRepoManager(resolved.Git.BaseURL, resolved.Git.Token, resolved.Git.Owner, resolved.Git.Username, "", "", resolved.Flux.Branch, "")
	if _, err := manager.EnsureOrganization(options.CreateOrganization); err != nil {
		return plan, fmt.Errorf("ensure Forgejo organization: %w", err)
	}
	if err := runFreshLifecycle(resolved, options); err != nil {
		return plan, fmt.Errorf("run fresh CI/CD bootstrap: %w", err)
	}
	return plan, nil
}

func reconcileFreshOrganization(cfg config.Config, options FreshOrganizationOptions) error {
	return freshLifecycleRunner(cfg, options).Run()
}

func freshLifecycleRunner(cfg config.Config, options FreshOrganizationOptions) Runner {
	mode := options.Mode
	if mode == "" {
		mode = Reconcile
	}
	return Runner{
		Config:                      cfg,
		Mode:                        mode,
		ConfirmRebuild:              options.ConfirmRebuild,
		SkipDeliveryScaffolding:     true,
		AutoMergeBootstrapMigration: true,
	}
}

func validateFreshWorkspace(cfg config.Config) error {
	cloneRelative, err := filepath.Rel(cfg.WorkspaceDir, cfg.Git.CloneParent)
	if err != nil || filepath.Dir(cloneRelative) != "." {
		return errors.New("git cloneParent must be a direct child of isolated workspaceDir")
	}
	secretFiles, secretDirectories, err := freshWorkspaceSecretPaths(cfg, cloneRelative)
	if err != nil {
		return err
	}
	info, err := os.Lstat(cfg.WorkspaceDir)
	if os.IsNotExist(err) {
		return nil
	}
	if err != nil {
		return fmt.Errorf("inspect workspaceDir: %w", err)
	}
	if info.Mode()&os.ModeSymlink != 0 || !info.IsDir() {
		return errors.New("workspaceDir must be an isolated directory")
	}
	entries, err := os.ReadDir(cfg.WorkspaceDir)
	if err != nil {
		return fmt.Errorf("inspect workspaceDir: %w", err)
	}
	if len(entries) == 0 {
		return nil
	}
	lockPath := filepath.Join(cfg.WorkspaceDir, "maidn-template-revisions.yaml")
	if !freshWorkspaceRegularFile(lockPath) {
		return errors.New("workspaceDir contains ambiguous state; use a new empty isolated workspaceDir")
	}
	lock, err := readTemplateRevisionLock(lockPath)
	if err != nil || !sameTemplateSource(lock.CICD, templateCheckout{Repository: cfg.Templates.CICDRepoURL, Ref: cfg.Templates.CICDRepoRef}) || !sameTemplateSource(lock.Manifests, templateCheckout{Repository: cfg.Templates.ManifestsRepoURL, Ref: cfg.Templates.ManifestsRepoRef}) || !sameTemplateSource(lock.Talos, templateCheckout{Repository: cfg.Templates.TalosRepoURL, Ref: cfg.Templates.TalosRepoRef}) {
		return errors.New("workspaceDir contains ambiguous state; use a new empty isolated workspaceDir")
	}
	allowedFiles := map[string]bool{
		"maidn-template-revisions.yaml": true,
		"maidn-bootstrap.resolved.yaml": true,
	}
	allowedDirectories := map[string]bool{
		"maidn-cicd-cluster-template":        true,
		"cicd-deployment-manifests-template": true,
		cloneRelative:                        true,
	}
	for path := range secretFiles {
		if filepath.Dir(path) == "." {
			allowedFiles[path] = true
		}
	}
	for path := range secretDirectories {
		if filepath.Dir(path) == "." {
			allowedDirectories[path] = true
		}
	}
	for _, entry := range entries {
		if allowedFiles[entry.Name()] {
			if !freshWorkspaceRegularFile(filepath.Join(cfg.WorkspaceDir, entry.Name())) {
				return errors.New("workspaceDir contains ambiguous state; use a new empty isolated workspaceDir")
			}
			continue
		}
		if !allowedDirectories[entry.Name()] || !freshWorkspaceDirectory(filepath.Join(cfg.WorkspaceDir, entry.Name())) {
			return errors.New("workspaceDir contains ambiguous state; use a new empty isolated workspaceDir")
		}
	}
	return validateFreshWorkspaceSecretDirectories(cfg.WorkspaceDir, secretFiles, secretDirectories)
}

func freshWorkspaceSecretPaths(cfg config.Config, cloneRelative string) (map[string]bool, map[string]bool, error) {
	files := map[string]bool{}
	directories := map[string]bool{}
	protected := map[string]bool{
		"maidn-template-revisions.yaml":      true,
		"maidn-bootstrap.resolved.yaml":      true,
		"maidn-cicd-cluster-template":        true,
		"cicd-deployment-manifests-template": true,
		cloneRelative:                        true,
	}
	for _, path := range []string{cfg.SOPS.AgeKeyPath, cfg.SOPS.BootstrapSecretsPath, cfg.SOPS.OperationalSecretsPath, cfg.SOPS.RecoveryIdentityPath, cfg.SOPS.RecoveryBundlePath} {
		if path == "" || !filepath.IsAbs(path) {
			continue
		}
		relative, err := filepath.Rel(cfg.WorkspaceDir, path)
		if err != nil || relative == "." || relative == ".." || filepath.IsAbs(relative) || strings.HasPrefix(relative, ".."+string(filepath.Separator)) {
			continue
		}
		parts := strings.Split(filepath.ToSlash(relative), "/")
		if protected[parts[0]] {
			return nil, nil, errors.New("SOPS and recovery paths must not use protected workspace paths")
		}
		files[relative] = true
		for parent := filepath.Dir(relative); parent != "."; parent = filepath.Dir(parent) {
			directories[parent] = true
		}
	}
	for path := range files {
		if directories[path] {
			return nil, nil, errors.New("SOPS and recovery paths must not overlap")
		}
	}
	return files, directories, nil
}

func validateFreshWorkspaceSecretDirectories(workspace string, files, directories map[string]bool) error {
	for directory := range directories {
		if directories[filepath.Dir(directory)] {
			continue
		}
		if err := validateFreshWorkspaceSecretDirectory(workspace, directory, files, directories); err != nil {
			return err
		}
	}
	return nil
}

func validateFreshWorkspaceSecretDirectory(workspace, directory string, files, directories map[string]bool) error {
	path := filepath.Join(workspace, directory)
	entries, err := os.ReadDir(path)
	if os.IsNotExist(err) {
		return nil
	}
	if err != nil || !freshWorkspaceDirectory(path) {
		return errors.New("workspaceDir contains ambiguous state; use a new empty isolated workspaceDir")
	}
	for _, entry := range entries {
		relative := filepath.Join(directory, entry.Name())
		path := filepath.Join(workspace, relative)
		if files[relative] && freshWorkspaceRegularFile(path) {
			continue
		}
		if directories[relative] && freshWorkspaceDirectory(path) {
			if err := validateFreshWorkspaceSecretDirectory(workspace, relative, files, directories); err != nil {
				return err
			}
			continue
		}
		return errors.New("workspaceDir contains ambiguous state; use a new empty isolated workspaceDir")
	}
	return nil
}

func freshWorkspaceRegularFile(path string) bool {
	info, err := os.Lstat(path)
	return err == nil && info.Mode()&os.ModeSymlink == 0 && info.Mode().IsRegular()
}

func freshWorkspaceDirectory(path string) bool {
	info, err := os.Lstat(path)
	return err == nil && info.Mode()&os.ModeSymlink == 0 && info.IsDir()
}