package database

import (
	"context"
	"fmt"
	"testing"
	"time"
)

// TestCascadeDeleteDebug tests cascade delete with debug output
func TestCascadeDeleteDebug(t *testing.T) {
	db, cleanup := setupTestDB(t)
	defer cleanup()

	ctx := context.Background()
	repos := NewRepositories(db)

	// Check if foreign keys are enabled
	var fkEnabled int
	err := db.conn.QueryRow("PRAGMA foreign_keys").Scan(&fkEnabled)
	if err != nil {
		t.Fatal(err)
	}
	t.Logf("Foreign keys enabled: %d", fkEnabled)

	// Create a file
	file := &File{
		Path:  "/cascade-test.txt",
		MTime: time.Now().Truncate(time.Second),
		CTime: time.Now().Truncate(time.Second),
		Size:  1024,
		Mode:  0644,
		UID:   1000,
		GID:   1000,
	}
	err = repos.Files.Create(ctx, nil, file)
	if err != nil {
		t.Fatalf("failed to create file: %v", err)
	}
	t.Logf("Created file with ID: %s", file.ID)

	// Create chunks and file-chunk mappings
	for i := 0; i < 3; i++ {
		chunk := &Chunk{
			ChunkHash: fmt.Sprintf("cascade-chunk-%d", i),
			SHA256:    fmt.Sprintf("cascade-sha-%d", i),
			Size:      1024,
		}
		err = repos.Chunks.Create(ctx, nil, chunk)
		if err != nil {
			t.Fatalf("failed to create chunk: %v", err)
		}

		fc := &FileChunk{
			FileID:    file.ID,
			Idx:       i,
			ChunkHash: chunk.ChunkHash,
		}
		err = repos.FileChunks.Create(ctx, nil, fc)
		if err != nil {
			t.Fatalf("failed to create file chunk: %v", err)
		}
		t.Logf("Created file chunk mapping: file_id=%s, idx=%d, chunk=%s", fc.FileID, fc.Idx, fc.ChunkHash)
	}

	// Verify file chunks exist
	fileChunks, err := repos.FileChunks.GetByFileID(ctx, file.ID)
	if err != nil {
		t.Fatal(err)
	}
	t.Logf("File chunks before delete: %d", len(fileChunks))

	// Check the foreign key constraint
	var fkInfo string
	err = db.conn.QueryRow(`
		SELECT sql FROM sqlite_master 
		WHERE type='table' AND name='file_chunks'
	`).Scan(&fkInfo)
	if err != nil {
		t.Fatal(err)
	}
	t.Logf("file_chunks table definition:\n%s", fkInfo)

	// Delete the file
	t.Log("Deleting file...")
	err = repos.Files.DeleteByID(ctx, nil, file.ID)
	if err != nil {
		t.Fatalf("failed to delete file: %v", err)
	}

	// Verify file is gone
	deletedFile, err := repos.Files.GetByID(ctx, file.ID)
	if err != nil {
		t.Fatal(err)
	}
	if deletedFile != nil {
		t.Error("file should have been deleted")
	} else {
		t.Log("File was successfully deleted")
	}

	// Check file chunks after delete
	fileChunks, err = repos.FileChunks.GetByFileID(ctx, file.ID)
	if err != nil {
		t.Fatal(err)
	}
	t.Logf("File chunks after delete: %d", len(fileChunks))

	// Manually check the database
	var count int
	err = db.conn.QueryRow("SELECT COUNT(*) FROM file_chunks WHERE file_id = ?", file.ID).Scan(&count)
	if err != nil {
		t.Fatal(err)
	}
	t.Logf("Manual count of file_chunks for deleted file: %d", count)

	if len(fileChunks) != 0 {
		t.Errorf("expected 0 file chunks after cascade delete, got %d", len(fileChunks))
		// List the remaining chunks
		for _, fc := range fileChunks {
			t.Logf("Remaining chunk: file_id=%s, idx=%d, chunk=%s", fc.FileID, fc.Idx, fc.ChunkHash)
		}
	}
}