package sqlite

import (
	"context"
	"testing"

	"github.com/steveyegge/beads/internal/types"
)

func TestDeleteIssues(t *testing.T) {
	ctx := context.Background()

	t.Run("delete non-existent issue", func(t *testing.T) {
		store := newTestStore(t, "file::memory:?mode=memory&cache=private")
		result, err := store.DeleteIssues(ctx, []string{"bd-999"}, false, false, false)
		if err != nil {
			t.Fatalf("DeleteIssues failed: %v", err)
		}
		if result.DeletedCount != 0 {
			t.Errorf("Expected 0 deletions, got %d", result.DeletedCount)
		}
	})

	t.Run("delete with dependents - should fail without force or cascade", func(t *testing.T) {
		store := newTestStore(t, "file::memory:?mode=memory&cache=private")
		
		// Create issues with dependency
		issue1 := &types.Issue{ID: "bd-1", Title: "Parent", Status: types.StatusOpen, Priority: 1, IssueType: types.TypeTask}
		issue2 := &types.Issue{ID: "bd-2", Title: "Child", Status: types.StatusOpen, Priority: 1, IssueType: types.TypeTask}
		if err := store.CreateIssue(ctx, issue1, "test"); err != nil {
			t.Fatalf("Failed to create issue1: %v", err)
		}
		if err := store.CreateIssue(ctx, issue2, "test"); err != nil {
			t.Fatalf("Failed to create issue2: %v", err)
		}
		dep := &types.Dependency{IssueID: "bd-2", DependsOnID: "bd-1", Type: types.DepBlocks}
		if err := store.AddDependency(ctx, dep, "test"); err != nil {
			t.Fatalf("Failed to add dependency: %v", err)
		}
		
		_, err := store.DeleteIssues(ctx, []string{"bd-1"}, false, false, false)
		if err == nil {
			t.Fatal("Expected error when deleting issue with dependents")
		}
	})

	t.Run("delete with cascade - should delete all dependents", func(t *testing.T) {
		store := newTestStore(t, "file::memory:?mode=memory&cache=private")
		
		// Create chain: bd-1 -> bd-2 -> bd-3
		issue1 := &types.Issue{ID: "bd-1", Title: "Cascade Parent", Status: types.StatusOpen, Priority: 1, IssueType: types.TypeTask}
		issue2 := &types.Issue{ID: "bd-2", Title: "Cascade Child", Status: types.StatusOpen, Priority: 1, IssueType: types.TypeTask}
		issue3 := &types.Issue{ID: "bd-3", Title: "Cascade Grandchild", Status: types.StatusOpen, Priority: 1, IssueType: types.TypeTask}
		
		if err := store.CreateIssue(ctx, issue1, "test"); err != nil {
			t.Fatalf("Failed to create issue1: %v", err)
		}
		if err := store.CreateIssue(ctx, issue2, "test"); err != nil {
			t.Fatalf("Failed to create issue2: %v", err)
		}
		if err := store.CreateIssue(ctx, issue3, "test"); err != nil {
			t.Fatalf("Failed to create issue3: %v", err)
		}
		
		dep1 := &types.Dependency{IssueID: "bd-2", DependsOnID: "bd-1", Type: types.DepBlocks}
		if err := store.AddDependency(ctx, dep1, "test"); err != nil {
			t.Fatalf("Failed to add dependency: %v", err)
		}
		dep2 := &types.Dependency{IssueID: "bd-3", DependsOnID: "bd-2", Type: types.DepBlocks}
		if err := store.AddDependency(ctx, dep2, "test"); err != nil {
			t.Fatalf("Failed to add dependency: %v", err)
		}

		result, err := store.DeleteIssues(ctx, []string{"bd-1"}, true, false, false)
		if err != nil {
			t.Fatalf("DeleteIssues with cascade failed: %v", err)
		}
		if result.DeletedCount != 3 {
			t.Errorf("Expected 3 deletions (cascade), got %d", result.DeletedCount)
		}

		// Verify all deleted
		if issue, _ := store.GetIssue(ctx, "bd-1"); issue != nil {
			t.Error("bd-1 should be deleted")
		}
		if issue, _ := store.GetIssue(ctx, "bd-2"); issue != nil {
			t.Error("bd-2 should be deleted")
		}
		if issue, _ := store.GetIssue(ctx, "bd-3"); issue != nil {
			t.Error("bd-3 should be deleted")
		}
	})

	t.Run("delete with force - should orphan dependents", func(t *testing.T) {
		store := newTestStore(t, "file::memory:?mode=memory&cache=private")
		
		// Create chain: bd-1 -> bd-2 -> bd-3
		issue1 := &types.Issue{ID: "bd-1", Title: "Force Parent", Status: types.StatusOpen, Priority: 1, IssueType: types.TypeTask}
		issue2 := &types.Issue{ID: "bd-2", Title: "Force Child", Status: types.StatusOpen, Priority: 1, IssueType: types.TypeTask}
		issue3 := &types.Issue{ID: "bd-3", Title: "Force Grandchild", Status: types.StatusOpen, Priority: 1, IssueType: types.TypeTask}
		
		if err := store.CreateIssue(ctx, issue1, "test"); err != nil {
			t.Fatalf("Failed to create issue1: %v", err)
		}
		if err := store.CreateIssue(ctx, issue2, "test"); err != nil {
			t.Fatalf("Failed to create issue2: %v", err)
		}
		if err := store.CreateIssue(ctx, issue3, "test"); err != nil {
			t.Fatalf("Failed to create issue3: %v", err)
		}
		
		dep1 := &types.Dependency{IssueID: "bd-2", DependsOnID: "bd-1", Type: types.DepBlocks}
		if err := store.AddDependency(ctx, dep1, "test"); err != nil {
			t.Fatalf("Failed to add dependency: %v", err)
		}
		dep2 := &types.Dependency{IssueID: "bd-3", DependsOnID: "bd-2", Type: types.DepBlocks}
		if err := store.AddDependency(ctx, dep2, "test"); err != nil {
			t.Fatalf("Failed to add dependency: %v", err)
		}

		result, err := store.DeleteIssues(ctx, []string{"bd-1"}, false, true, false)
		if err != nil {
			t.Fatalf("DeleteIssues with force failed: %v", err)
		}
		if result.DeletedCount != 1 {
			t.Errorf("Expected 1 deletion (force), got %d", result.DeletedCount)
		}
		if len(result.OrphanedIssues) != 1 || result.OrphanedIssues[0] != "bd-2" {
			t.Errorf("Expected bd-2 to be orphaned, got %v", result.OrphanedIssues)
		}

		// Verify bd-1 deleted, bd-2 and bd-3 still exist
		if issue, _ := store.GetIssue(ctx, "bd-1"); issue != nil {
			t.Error("bd-1 should be deleted")
		}
		if issue, _ := store.GetIssue(ctx, "bd-2"); issue == nil {
			t.Error("bd-2 should still exist")
		}
		if issue, _ := store.GetIssue(ctx, "bd-3"); issue == nil {
			t.Error("bd-3 should still exist")
		}
	})

	t.Run("dry run - should not delete", func(t *testing.T) {
		store := newTestStore(t, "file::memory:?mode=memory&cache=private")
		
		issue1 := &types.Issue{ID: "bd-1", Title: "DryRun Issue 1", Status: types.StatusOpen, Priority: 1, IssueType: types.TypeTask}
		issue2 := &types.Issue{ID: "bd-2", Title: "DryRun Issue 2", Status: types.StatusOpen, Priority: 1, IssueType: types.TypeTask}
		
		if err := store.CreateIssue(ctx, issue1, "test"); err != nil {
			t.Fatalf("Failed to create issue1: %v", err)
		}
		if err := store.CreateIssue(ctx, issue2, "test"); err != nil {
			t.Fatalf("Failed to create issue2: %v", err)
		}

		result, err := store.DeleteIssues(ctx, []string{"bd-1", "bd-2"}, false, true, true)
		if err != nil {
			t.Fatalf("DeleteIssues dry run failed: %v", err)
		}

		// Should report what would be deleted
		if result.DeletedCount != 2 {
			t.Errorf("Dry run should report 2 deletions, got %d", result.DeletedCount)
		}

		// But issues should still exist
		if issue, _ := store.GetIssue(ctx, "bd-1"); issue == nil {
			t.Error("bd-1 should still exist after dry run")
		}
		if issue, _ := store.GetIssue(ctx, "bd-2"); issue == nil {
			t.Error("bd-2 should still exist after dry run")
		}
	})

	t.Run("delete multiple issues at once", func(t *testing.T) {
		store := newTestStore(t, "file::memory:?mode=memory&cache=private")
		
		independent1 := &types.Issue{ID: "bd-10", Title: "Independent 1", Status: types.StatusOpen, Priority: 1, IssueType: types.TypeTask}
		independent2 := &types.Issue{ID: "bd-11", Title: "Independent 2", Status: types.StatusOpen, Priority: 1, IssueType: types.TypeTask}

		if err := store.CreateIssue(ctx, independent1, "test"); err != nil {
			t.Fatalf("Failed to create independent1: %v", err)
		}
		if err := store.CreateIssue(ctx, independent2, "test"); err != nil {
			t.Fatalf("Failed to create independent2: %v", err)
		}

		result, err := store.DeleteIssues(ctx, []string{"bd-10", "bd-11"}, false, false, false)
		if err != nil {
			t.Fatalf("DeleteIssues failed: %v", err)
		}
		if result.DeletedCount != 2 {
			t.Errorf("Expected 2 deletions, got %d", result.DeletedCount)
		}

		// Verify both deleted
		if issue, _ := store.GetIssue(ctx, "bd-10"); issue != nil {
			t.Error("bd-10 should be deleted")
		}
		if issue, _ := store.GetIssue(ctx, "bd-11"); issue != nil {
			t.Error("bd-11 should be deleted")
		}
	})
}

func TestDeleteIssue(t *testing.T) {
	store := newTestStore(t, "file::memory:?mode=memory&cache=private")
	ctx := context.Background()

	issue := &types.Issue{
		ID:        "bd-1",
		Title:     "Single Delete Test Issue",
		Status:    types.StatusOpen,
		Priority:  1,
		IssueType: types.TypeTask,
	}

	if err := store.CreateIssue(ctx, issue, "test"); err != nil {
		t.Fatalf("Failed to create issue: %v", err)
	}

	// Delete it
	if err := store.DeleteIssue(ctx, "bd-1"); err != nil {
		t.Fatalf("DeleteIssue failed: %v", err)
	}

	// Verify deleted
	if issue, _ := store.GetIssue(ctx, "bd-1"); issue != nil {
		t.Error("Issue should be deleted")
	}

	// Delete non-existent - should error
	if err := store.DeleteIssue(ctx, "bd-999"); err == nil {
		t.Error("DeleteIssue of non-existent should error")
	}
}

func TestBuildIDSet(t *testing.T) {
	ids := []string{"bd-1", "bd-2", "bd-3"}
	idSet := buildIDSet(ids)

	if len(idSet) != 3 {
		t.Errorf("Expected set size 3, got %d", len(idSet))
	}

	for _, id := range ids {
		if !idSet[id] {
			t.Errorf("ID %s should be in set", id)
		}
	}

	if idSet["bd-999"] {
		t.Error("bd-999 should not be in set")
	}
}

func TestBuildSQLInClause(t *testing.T) {
	ids := []string{"bd-1", "bd-2", "bd-3"}
	inClause, args := buildSQLInClause(ids)

	expectedClause := "?,?,?"
	if inClause != expectedClause {
		t.Errorf("Expected clause %s, got %s", expectedClause, inClause)
	}

	if len(args) != 3 {
		t.Errorf("Expected 3 args, got %d", len(args))
	}

	for i, id := range ids {
		if args[i] != id {
			t.Errorf("Args[%d]: expected %s, got %v", i, id, args[i])
		}
	}
}