package cmd

import (
	"bytes"
	"os"
	"strings"
	"testing"

	"git.membo.co.uk/dtomlinson/gitlocal/internal/config"
	"git.membo.co.uk/dtomlinson/gitlocal/internal/git"
	"git.membo.co.uk/dtomlinson/gitlocal/internal/testutil"
)

// setupTestConfig creates a temporary home directory and config for testing
func setupTestConfig(t *testing.T) (cleanup func()) {
	t.Helper()

	originalHome := os.Getenv("HOME")
	tempHome := t.TempDir()
	os.Setenv("HOME", tempHome)

	return func() {
		os.Setenv("HOME", originalHome)
	}
}

func TestConvertSingleRepo(t *testing.T) {
	cleanup := setupTestConfig(t)
	defer cleanup()

	repoDir := testutil.CreateTempGitRepoWithRemote(t, "git@github.com:test/repo.git")

	// Run convert command
	convertCmd.Flags().Set("recursive", "false")
	convertCmd.Flags().Set("dry-run", "false")
	err := runConvert(convertCmd, []string{repoDir})

	if err != nil {
		t.Fatalf("convert command failed: %v", err)
	}

	// Verify .git was renamed to .gitlocal
	if git.IsGitRepo(repoDir) {
		t.Error("expected .git to be converted")
	}

	if !git.IsGitLocalRepo(repoDir) {
		t.Error("expected .gitlocal to exist")
	}

	// Verify config was updated
	cfg, err := config.Load()
	if err != nil {
		t.Fatalf("failed to load config: %v", err)
	}

	if len(cfg.Repos) != 1 {
		t.Fatalf("expected 1 repo in config, got %d", len(cfg.Repos))
	}

	if cfg.Repos[0].Path != repoDir {
		t.Errorf("expected path %s, got %s", repoDir, cfg.Repos[0].Path)
	}

	if cfg.Repos[0].OriginalRemote != "git@github.com:test/repo.git" {
		t.Errorf("expected remote to be saved in config, got %s", cfg.Repos[0].OriginalRemote)
	}
}

func TestConvertDryRun(t *testing.T) {
	cleanup := setupTestConfig(t)
	defer cleanup()

	repoDir := testutil.CreateTempGitRepo(t)

	// Run convert with dry-run
	dryRun = true
	defer func() { dryRun = false }()

	convertCmd.Flags().Set("dry-run", "true")
	err := runConvert(convertCmd, []string{repoDir})

	if err != nil {
		t.Fatalf("convert dry-run failed: %v", err)
	}

	// Verify nothing was actually converted
	if !git.IsGitRepo(repoDir) {
		t.Error("expected .git to still exist (dry-run)")
	}

	if git.IsGitLocalRepo(repoDir) {
		t.Error("expected .gitlocal to not exist (dry-run)")
	}

	// Verify config was not updated
	cfg, err := config.Load()
	if err != nil {
		t.Fatalf("failed to load config: %v", err)
	}

	if len(cfg.Repos) != 0 {
		t.Errorf("expected config to be empty (dry-run), got %d repos", len(cfg.Repos))
	}
}

func TestConvertRecursive(t *testing.T) {
	cleanup := setupTestConfig(t)
	defer cleanup()

	rootDir, nestedDirs := testutil.CreateNestedRepoStructure(t)

	// Run convert recursively
	recursive = true
	defer func() { recursive = false }()

	convertCmd.Flags().Set("recursive", "true")
	err := runConvert(convertCmd, []string{rootDir})

	if err != nil {
		t.Fatalf("convert recursive failed: %v", err)
	}

	// Verify all nested repos were converted
	for _, nestedDir := range nestedDirs {
		if git.IsGitRepo(nestedDir) {
			t.Errorf("expected %s to be converted", nestedDir)
		}

		if !git.IsGitLocalRepo(nestedDir) {
			t.Errorf("expected %s to have .gitlocal", nestedDir)
		}
	}

	// Verify config has all repos
	cfg, err := config.Load()
	if err != nil {
		t.Fatalf("failed to load config: %v", err)
	}

	if len(cfg.Repos) != len(nestedDirs) {
		t.Errorf("expected %d repos in config, got %d", len(nestedDirs), len(cfg.Repos))
	}
}

func TestConvertAlreadyConverted(t *testing.T) {
	cleanup := setupTestConfig(t)
	defer cleanup()

	repoDir := testutil.CreateTempGitRepo(t)

	// First convert
	convertCmd.Flags().Set("recursive", "false")
	err := runConvert(convertCmd, []string{repoDir})
	if err != nil {
		t.Fatalf("first convert failed: %v", err)
	}

	// Try to convert again - should register it
	err = runConvert(convertCmd, []string{repoDir})
	if err != nil {
		t.Errorf("expected no error when re-converting, got: %v", err)
	}

	// Should still only have 1 entry in config
	cfg, err := config.Load()
	if err != nil {
		t.Fatalf("failed to load config: %v", err)
	}

	if len(cfg.Repos) != 1 {
		t.Errorf("expected 1 repo in config, got %d", len(cfg.Repos))
	}
}

func TestConvertNoGitRepo(t *testing.T) {
	cleanup := setupTestConfig(t)
	defer cleanup()

	nonGitDir := t.TempDir()

	err := runConvert(convertCmd, []string{nonGitDir})

	if err == nil {
		t.Error("expected error when converting non-git directory")
	}

	if !strings.Contains(err.Error(), "no .git directory") {
		t.Errorf("expected 'no .git directory' error, got: %v", err)
	}
}

func TestRevertSingleRepo(t *testing.T) {
	cleanup := setupTestConfig(t)
	defer cleanup()

	repoDir := testutil.CreateTempGitRepo(t)

	// Convert first
	convertCmd.Flags().Set("recursive", "false")
	if err := runConvert(convertCmd, []string{repoDir}); err != nil {
		t.Fatalf("convert failed: %v", err)
	}

	// Now revert
	err := runRevert(revertCmd, []string{repoDir})

	if err != nil {
		t.Fatalf("revert command failed: %v", err)
	}

	// Verify .gitlocal was renamed back to .git
	if !git.IsGitRepo(repoDir) {
		t.Error("expected .git to exist after revert")
	}

	if git.IsGitLocalRepo(repoDir) {
		t.Error("expected .gitlocal to be gone after revert")
	}

	// Verify config was updated
	cfg, err := config.Load()
	if err != nil {
		t.Fatalf("failed to load config: %v", err)
	}

	if len(cfg.Repos) != 0 {
		t.Errorf("expected config to be empty after revert, got %d repos", len(cfg.Repos))
	}
}

func TestRevertAll(t *testing.T) {
	cleanup := setupTestConfig(t)
	defer cleanup()

	// Create and convert multiple repos
	repo1 := testutil.CreateTempGitRepo(t)
	repo2 := testutil.CreateTempGitRepo(t)
	repo3 := testutil.CreateTempGitRepo(t)

	for _, repo := range []string{repo1, repo2, repo3} {
		convertCmd.Flags().Set("recursive", "false")
		if err := runConvert(convertCmd, []string{repo}); err != nil {
			t.Fatalf("convert failed for %s: %v", repo, err)
		}
	}

	// Verify all were converted
	cfg, err := config.Load()
	if err != nil {
		t.Fatalf("failed to load config: %v", err)
	}
	if len(cfg.Repos) != 3 {
		t.Fatalf("expected 3 repos in config, got %d", len(cfg.Repos))
	}

	// Revert all
	revertAll = true
	defer func() { revertAll = false }()

	revertCmd.Flags().Set("all", "true")
	err = runRevert(revertCmd, []string{})

	if err != nil {
		t.Fatalf("revert --all failed: %v", err)
	}

	// Verify all were reverted
	for _, repo := range []string{repo1, repo2, repo3} {
		if !git.IsGitRepo(repo) {
			t.Errorf("expected %s to have .git after revert --all", repo)
		}

		if git.IsGitLocalRepo(repo) {
			t.Errorf("expected %s to not have .gitlocal after revert --all", repo)
		}
	}

	// Verify config is empty
	cfg, err = config.Load()
	if err != nil {
		t.Fatalf("failed to load config: %v", err)
	}

	if len(cfg.Repos) != 0 {
		t.Errorf("expected config to be empty after revert --all, got %d repos", len(cfg.Repos))
	}
}

func TestRevertNoGitLocal(t *testing.T) {
	cleanup := setupTestConfig(t)
	defer cleanup()

	nonGitDir := t.TempDir()

	err := runRevert(revertCmd, []string{nonGitDir})

	if err == nil {
		t.Error("expected error when reverting directory without .gitlocal")
	}

	if !strings.Contains(err.Error(), "no .gitlocal directory") {
		t.Errorf("expected 'no .gitlocal directory' error, got: %v", err)
	}
}

func TestStatus(t *testing.T) {
	cleanup := setupTestConfig(t)
	defer cleanup()

	// Create and convert a repo
	repoDir := testutil.CreateTempGitRepoWithRemote(t, "git@github.com:test/repo.git")
	convertCmd.Flags().Set("recursive", "false")
	if err := runConvert(convertCmd, []string{repoDir}); err != nil {
		t.Fatalf("convert failed: %v", err)
	}

	// Capture output
	var buf bytes.Buffer
	originalStdout := os.Stdout
	r, w, _ := os.Pipe()
	os.Stdout = w

	err := runStatus(statusCmd, []string{})

	w.Close()
	os.Stdout = originalStdout
	buf.ReadFrom(r)
	output := buf.String()

	if err != nil {
		t.Fatalf("status command failed: %v", err)
	}

	// Verify output contains repo info
	if !strings.Contains(output, repoDir) {
		t.Errorf("expected output to contain repo path %s", repoDir)
	}

	if !strings.Contains(output, "git@github.com:test/repo.git") {
		t.Error("expected output to contain remote URL")
	}
}

func TestStatusEmpty(t *testing.T) {
	cleanup := setupTestConfig(t)
	defer cleanup()

	// Capture output
	var buf bytes.Buffer
	originalStdout := os.Stdout
	r, w, _ := os.Pipe()
	os.Stdout = w

	err := runStatus(statusCmd, []string{})

	w.Close()
	os.Stdout = originalStdout
	buf.ReadFrom(r)
	output := buf.String()

	if err != nil {
		t.Fatalf("status command failed: %v", err)
	}

	if !strings.Contains(output, "No converted repositories") {
		t.Error("expected 'No converted repositories' message")
	}
}

func TestConvertCurrentDirectory(t *testing.T) {
	cleanup := setupTestConfig(t)
	defer cleanup()

	repoDir := testutil.CreateTempGitRepo(t)

	// Change to repo directory
	originalWd, _ := os.Getwd()
	os.Chdir(repoDir)
	defer os.Chdir(originalWd)

	// Run convert without arguments (should use current directory)
	convertCmd.Flags().Set("recursive", "false")
	err := runConvert(convertCmd, []string{})

	if err != nil {
		t.Fatalf("convert current directory failed: %v", err)
	}

	// Verify conversion
	if !git.IsGitLocalRepo(repoDir) {
		t.Error("expected current directory to be converted")
	}
}

func TestIntegrationFullWorkflow(t *testing.T) {
	cleanup := setupTestConfig(t)
	defer cleanup()

	// Create a root repo with nested repos
	rootDir, nestedDirs := testutil.CreateNestedRepoStructure(t)

	// Step 1: Convert all recursively
	recursive = true
	defer func() { recursive = false }()
	convertCmd.Flags().Set("recursive", "true")

	if err := runConvert(convertCmd, []string{rootDir}); err != nil {
		t.Fatalf("recursive convert failed: %v", err)
	}

	// Verify all converted
	for _, nestedDir := range nestedDirs {
		if !git.IsGitLocalRepo(nestedDir) {
			t.Errorf("expected %s to be converted", nestedDir)
		}
	}

	// Step 2: Check status
	cfg, err := config.Load()
	if err != nil {
		t.Fatalf("failed to load config: %v", err)
	}

	if len(cfg.Repos) != len(nestedDirs) {
		t.Errorf("expected %d repos in config, got %d", len(nestedDirs), len(cfg.Repos))
	}

	// Step 3: Revert one repo
	revertAll = false
	if err := runRevert(revertCmd, []string{nestedDirs[0]}); err != nil {
		t.Fatalf("revert single repo failed: %v", err)
	}

	// Verify it was reverted
	if !git.IsGitRepo(nestedDirs[0]) {
		t.Error("expected reverted repo to have .git")
	}

	// Step 4: Revert all remaining
	revertAll = true
	revertCmd.Flags().Set("all", "true")
	if err := runRevert(revertCmd, []string{}); err != nil {
		t.Fatalf("revert all failed: %v", err)
	}

	// Verify all reverted
	for _, nestedDir := range nestedDirs {
		if !git.IsGitRepo(nestedDir) {
			t.Errorf("expected %s to be reverted", nestedDir)
		}
	}

	// Verify config is empty
	cfg, err = config.Load()
	if err != nil {
		t.Fatalf("failed to load config: %v", err)
	}

	if len(cfg.Repos) != 0 {
		t.Errorf("expected empty config, got %d repos", len(cfg.Repos))
	}
}