//go:build cgo && manual

package parser

import (
	"context"
	"os"
	"path/filepath"
	"testing"
)

// TestTableRotation_Integration validates rotation detection with real DeepDoc.
//
// Prerequisites:
//   - DeepDoc running at localhost:9390 (or set DEEPDOC_URL)
//   - Test PDF: testdata/pdfs/table_rotation_test.pdf (generated by tools/generate_rotated_table_pdf.py)
//
// Run:
//
//	CGO_CFLAGS="..." CGO_LDFLAGS="..." \
//	  go test -tags 'cgo,manual' -run TestTableRotation_Integration -v -count=1
func TestTableRotation_Integration(t *testing.T) {
	pdfPath := filepath.Join("testdata", "pdfs", "table_rotation_test.pdf")
	if _, err := os.Stat(pdfPath); os.IsNotExist(err) {
		t.Skipf("test PDF not found: %s (run tools/generate_rotated_table_pdf.py first)", pdfPath)
	}

	baseURL := os.Getenv("DEEPDOC_URL")
	if baseURL == "" {
		baseURL = "http://localhost:9390"
	}
	dd, err := NewDeepDocClient(baseURL)
	if err != nil {
		t.Fatal(err)
	}
	if !dd.Health() {
		t.Fatalf("DeepDoc not available at %s", baseURL)
	}
	t.Logf("DeepDoc available at %s", baseURL)

	// Open PDF
	data, err := os.ReadFile(pdfPath)
	if err != nil {
		t.Fatal(err)
	}
	eng, err := NewEngine(data)
	if err != nil {
		t.Fatal(err)
	}
	defer eng.Close()

	pageCount, _ := eng.PageCount()
	t.Logf("PDF: %d pages", pageCount)

	cfg := DefaultParserConfig()
	cfg.ToPage = pageCount - 1
	autoRotate := true
	cfg.AutoRotateTables = &autoRotate
	_ = NewParser(cfg, dd) // verify construction does not panic

	for pg := 0; pg < pageCount; pg++ {
		pageImg, err := renderPageToImage(eng, pg)
		if err != nil {
			t.Fatalf("render page %d: %v", pg, err)
		}

		regions, err := dd.DLA(context.Background(), pageImg)
		if err != nil {
			t.Fatalf("DLA page %d: %v", pg, err)
		}

		tableCount := 0
		for _, r := range regions {
			if r.Label != "table" {
				continue
			}
			tableCount++

			// Crop table region
			cropped, err := cropImageRegion(pageImg, r)
			if err != nil {
				t.Errorf("  crop table %d: %v", tableCount, err)
				continue
			}

			// Evaluate rotation
			angle, _, scores := evaluateTableOrientation(context.Background(), cropped, dd)
			t.Logf("  Page %d Table %d: %dx%d, bestAngle=%d°, scores: 0=%.3f 90=%.3f 180=%.3f 270=%.3f",
				pg, tableCount, cropped.Bounds().Dx(), cropped.Bounds().Dy(),
				angle,
				scores[0], scores[90], scores[180], scores[270])

			// Verify: page 0 should be ~0°, page 1 should be ~90°
			if pg == 0 && angle != 0 {
				t.Errorf("Page 0 normal table: expected 0°, got %d°", angle)
			}
			// Page 1 has the rotated table - expect 90° (or 270° depending on DLA bbox)
			if pg == 1 {
				t.Logf("  NOTE: Page 1 rotated table detected as %d° (expect 90 or 270)", angle)

				// Verify TSR returns labels (6th element in bbox array).
				testCells, tsrErr := dd.TSR(context.Background(), cropped)
				if tsrErr == nil && len(testCells) > 0 {
					hasLabel := false
					for _, c := range testCells {
						if c.Label != "" {
							hasLabel = true
							break
						}
					}
					if !hasLabel {
						t.Error("TSR returned cells without labels")
					} else {
						t.Logf("  TSR labels OK: %d cells", len(testCells))
					}
				}
			}
		}
		t.Logf("Page %d: %d tables detected", pg, tableCount)
	}
}

// TestTableRotation_Stability runs rotation detection on a sample real PDF
// and verifies the pipeline doesn't crash. Set BATCH_COUNT to limit.
func TestTableRotation_Stability(t *testing.T) {
	baseURL := os.Getenv("DEEPDOC_URL")
	if baseURL == "" {
		baseURL = "http://localhost:9390"
	}
	dd, err := NewDeepDocClient(baseURL)
	if err != nil {
		t.Fatal(err)
	}
	if !dd.Health() {
		t.Fatalf("DeepDoc not available at %s", baseURL)
	}

	realDir := filepath.Join("testdata", "real_pdfs")
	entries, err := os.ReadDir(realDir)
	if err != nil {
		t.Skipf("no real PDFs: %v", err)
	}

	count := 0
	maxCount := 3 // sample size
	for _, e := range entries {
		if e.IsDir() || filepath.Ext(e.Name()) != ".pdf" {
			continue
		}
		if count >= maxCount {
			break
		}

		data, err := os.ReadFile(filepath.Join(realDir, e.Name()))
		if err != nil {
			continue
		}
		eng, err := NewEngine(data)
		if err != nil {
			continue
		}

		pageImg, err := renderPageToImage(eng, 0)
		eng.Close()
		if err != nil {
			continue
		}

		regions, _ := dd.DLA(context.Background(), pageImg)
		tables := 0
		rotated := 0
		for _, r := range regions {
			if r.Label != "table" {
				continue
			}
			tables++
			cropped, _ := cropImageRegion(pageImg, r)
			if cropped == nil {
				continue
			}
			angle, _, _ := evaluateTableOrientation(context.Background(), cropped, dd)
			if angle != 0 {
				rotated++
				t.Logf("  %s: rotated table detected (angle=%d°)", e.Name(), angle)
			}
		}
		t.Logf("  %s: %d tables, %d rotated", e.Name(), tables, rotated)
		count++
	}

	t.Logf("Sampled %d real PDFs", count)
}
