package job

import (
	"encoding/base64"
	"io"
	"net/http"
	"os"
	"path/filepath"
	"strings"
	"testing"

	"github.com/VeraeLLC/PrintToVeraeTimeStamp/internal/auth"
	"github.com/VeraeLLC/PrintToVeraeTimeStamp/internal/veraeapi"
)

func TestSanitizeAndStem(t *testing.T) {
	if SanitizeReceiptID("bafy/xyz!") != "bafy-xyz" {
		t.Fatal(SanitizeReceiptID("bafy/xyz!"))
	}
	if StemFromPath("/tmp/My Contract (1).pdf", "") != "My-Contract-1" {
		t.Fatal(StemFromPath("/tmp/My Contract (1).pdf", ""))
	}
}

func TestRunZapierWritesNamedFiles(t *testing.T) {
	dir := t.TempDir()
	src := filepath.Join(dir, "src.pdf")
	if err := os.WriteFile(src, []byte("%PDF-1.4 hello"), 0o600); err != nil {
		t.Fatal(err)
	}
	out := filepath.Join(dir, "out")
	pdf := []byte("%PDF-1.4 certificate-bytes")
	b64 := base64.StdEncoding.EncodeToString(pdf)

	client := &veraeapi.Client{
		Channel:     auth.ChannelZapier,
		ZapierBase:  "https://zap.test",
		XVeraeToken: "xVerae-x",
		HTTPDo: func(req *http.Request) (*http.Response, error) {
			body := `{"receipt_id":"bafyReceipt99","pdfBase64":"` + b64 + `"}`
			return &http.Response{StatusCode: 200, Body: io.NopCloser(strings.NewReader(body)), Header: make(http.Header)}, nil
		},
	}

	res, err := Run(Options{
		SourcePDF:    src,
		OutDir:       out,
		DocumentName: "Contract.pdf",
		Channel:      auth.ChannelZapier,
		Client:       client,
	})
	if err != nil {
		t.Fatal(err)
	}
	wantCert := filepath.Join(out, "Contract-verae-timestamp-bafyReceipt99.pdf")
	if res.CertificatePDF != wantCert {
		t.Fatalf("cert path %s want %s", res.CertificatePDF, wantCert)
	}
	if _, err := os.Stat(res.OriginalPDF); err != nil {
		t.Fatal(err)
	}
	got, _ := os.ReadFile(res.CertificatePDF)
	if !strings.HasPrefix(string(got), "%PDF") {
		t.Fatal("certificate is not a PDF")
	}
	if !strings.Contains(string(got), "Verae Timestamp Registration Document") {
		t.Fatal("missing branded title")
	}
	if strings.Contains(string(got), "mcp.verae.ai") || strings.Contains(string(got), "via MCP") {
		t.Fatal("certificate must not mention mcp.verae.ai / via MCP")
	}
	if _, err := os.Stat(res.ReceiptJSON); err != nil {
		t.Fatal(err)
	}
}

func TestRunVeraeRendersLocalCert(t *testing.T) {
	dir := t.TempDir()
	src := filepath.Join(dir, "memo.pdf")
	_ = os.WriteFile(src, []byte("%PDF-1.4 memo"), 0o600)
	out := filepath.Join(dir, "out")
	client := &veraeapi.Client{
		Channel:    auth.ChannelVerae,
		VeraeBase:  "https://api.test",
		VeraeToken: "jwt",
		HTTPDo: func(req *http.Request) (*http.Response, error) {
			body := `{"existing":true,"certificate":"cidLocal1","receipts":[{"certificate":"cidLocal1","completedAt":"2026-10-03T12:00:00Z","blockIndex":"99"}]}`
			if strings.HasPrefix(req.URL.Path, "/api/hash/") {
				body = `{"receipts":[{"certificate":"cidLocal1","completedAt":"2026-10-03T12:00:00Z","blockIndex":"99"}]}`
			}
			return &http.Response{StatusCode: 200, Body: io.NopCloser(strings.NewReader(body)), Header: make(http.Header)}, nil
		},
	}
	res, err := Run(Options{SourcePDF: src, OutDir: out, Channel: auth.ChannelVerae, Client: client})
	if err != nil {
		t.Fatal(err)
	}
	if !strings.Contains(res.CertificatePDF, "memo-verae-timestamp-cidLocal1.pdf") {
		t.Fatal(res.CertificatePDF)
	}
	b, _ := os.ReadFile(res.CertificatePDF)
	if !strings.HasPrefix(string(b), "%PDF") {
		t.Fatal("not a pdf")
	}
}

func TestRunNeverOverwritesSameName(t *testing.T) {
	dir := t.TempDir()
	out := filepath.Join(dir, "out")
	n := 0
	client := &veraeapi.Client{
		Channel:     auth.ChannelZapier,
		ZapierBase:  "https://zap.test",
		XVeraeToken: "xVerae-x",
		HTTPDo: func(req *http.Request) (*http.Response, error) {
			n++
			// same receipt id every time, to also exercise cert-name collisions
			body := `{"receipt_id":"bafySame"}`
			return &http.Response{StatusCode: 200, Body: io.NopCloser(strings.NewReader(body)), Header: make(http.Header)}, nil
		},
	}
	var results []Result
	for i, content := range []string{"%PDF-1.4 first", "%PDF-1.4 second", "%PDF-1.4 third"} {
		src := filepath.Join(dir, "src"+string(rune('a'+i))+".pdf")
		_ = os.WriteFile(src, []byte(content), 0o600)
		res, err := Run(Options{SourcePDF: src, OutDir: out, DocumentName: "Printed 2026-10-03 192901.pdf", Channel: auth.ChannelZapier, Client: client})
		if err != nil {
			t.Fatal(err)
		}
		results = append(results, res)
	}
	wantOrig := []string{"Printed 2026-10-03 192901.pdf", "Printed 2026-10-03 192901-2.pdf", "Printed 2026-10-03 192901-3.pdf"}
	wantJSON := []string{"Printed-2026-10-03-192901.verae.json", "Printed-2026-10-03-192901-2.verae.json", "Printed-2026-10-03-192901-3.verae.json"}
	wantCert := []string{"Printed-2026-10-03-192901-verae-timestamp-bafySame.pdf", "Printed-2026-10-03-192901-2-verae-timestamp-bafySame.pdf", "Printed-2026-10-03-192901-3-verae-timestamp-bafySame.pdf"}
	for i, r := range results {
		if filepath.Base(r.OriginalPDF) != wantOrig[i] || filepath.Base(r.ReceiptJSON) != wantJSON[i] || filepath.Base(r.CertificatePDF) != wantCert[i] {
			t.Fatalf("job %d: %s | %s | %s", i, filepath.Base(r.OriginalPDF), filepath.Base(r.ReceiptJSON), filepath.Base(r.CertificatePDF))
		}
	}
	if b, _ := os.ReadFile(results[0].OriginalPDF); string(b) != "%PDF-1.4 first" {
		t.Fatalf("first original overwritten: %q", b)
	}
	// a pre-existing cert with the target name is never overwritten
	p, err := writeExclusive(out, "Printed-2026-10-03-192901-verae-timestamp-bafySame", ".pdf", []byte("x"))
	if err != nil || filepath.Base(p) != "Printed-2026-10-03-192901-verae-timestamp-bafySame-2.pdf" {
		t.Fatal(p, err)
	}
}