package api

// P5c task 01: POST /v1/extract takes a PDF's bytes (a file already on the caller's host), and
// answers exactly like /v1/fetch does for a PDF URL. The cache key is the content hash.

import (
	"bytes"
	"encoding/json"
	"fmt"
	"log/slog"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
)

func (r *pdfRig) extract(t *testing.T, key, query string, body []byte, ct string) (int, map[string]any) {
	t.Helper()
	req := httptest.NewRequest(http.MethodPost, "/v1/extract"+query, bytes.NewReader(body))
	if ct != "" {
		req.Header.Set("Content-Type", ct)
	}
	if key != "" {
		req.Header.Set("Authorization", "Bearer "+key)
	}
	rec := httptest.NewRecorder()
	r.s.ServeHTTP(rec, req)
	var out map[string]any
	_ = json.Unmarshal(rec.Body.Bytes(), &out)
	return rec.Code, out
}

func TestExtractUpload(t *testing.T) {
	r := newPDFRig(t)
	pdf := threePDF()
	code, out := r.extract(t, r.fleet, "", pdf, "application/pdf")
	if code != 200 {
		t.Fatalf("%d %v", code, out)
	}
	content, _ := out["content"].(string)
	if !strings.Contains(content, "--- page 2 ---") || !strings.Contains(content, "quick brown fox") {
		t.Errorf("content %q", content)
	}
	if p := pdfInfo(t, out); p["pages"] != 3.0 || p["title"] != "Three Pages" {
		t.Errorf("pdf %v", p)
	}
	src, _ := out["source"].(map[string]any)
	if src["kind"] != "upload" || src["bytes"] != float64(len(pdf)) || !strings.HasPrefix(fmt.Sprint(src["hash"]), "sha256:") || src["cached"] != false {
		t.Errorf("source %v", src)
	}
	if _, hasURL := src["url"]; hasURL {
		t.Error("an upload has no URL; source must not invent one")
	}
	// The same bytes again: from the cache, no child.
	code, out = r.extract(t, r.fleet, "?pages=2", pdf, "application/octet-stream")
	if code != 200 || r.runs() != 1 {
		t.Fatalf("second upload: %d, %d extractions; want 200 and 1", code, r.runs())
	}
	if src, _ := out["source"].(map[string]any); src["cached"] != true {
		t.Errorf("second upload source %v, want cached", src)
	}
	if c, _ := out["content"].(string); strings.Contains(c, "--- page 1 ---") || !strings.Contains(c, "--- page 2 ---") {
		t.Errorf("pages=2: %q", c)
	}
	code, out = r.extract(t, r.fleet, "?grep=quick+brown", pdf, "application/pdf")
	if c, _ := out["content"].(string); code != 200 || !strings.Contains(c, "p. 2: The quick brown fox") {
		t.Errorf("grep: %d %q", code, c)
	}
}

func TestExtractRefusals(t *testing.T) {
	r := newPDFRig(t)
	if code, _ := r.extract(t, "", "", threePDF(), "application/pdf"); code != 401 {
		t.Errorf("no key: %d, want 401", code)
	}
	if code, out := r.extract(t, r.fleet, "", []byte("<html>not a pdf</html>"), "text/html"); code != 415 {
		t.Errorf("html body: %d %v, want 415", code, out)
	}
	if code, _ := r.extract(t, r.fleet, "", nil, "application/pdf"); code != 400 {
		t.Errorf("empty body: %d, want 400", code)
	}
	if code, _ := r.extract(t, r.fleet, "?pages=0-1", threePDF(), "application/pdf"); code != 400 {
		t.Errorf("bad pages: %d, want 400", code)
	}
	r.s.PDFMaxUpload = 1000
	if code, out := r.extract(t, r.fleet, "", threePDF(), "application/pdf"); code != 413 {
		t.Errorf("over PDFMaxUpload: %d %v, want 413", code, out)
	}
	if DefaultPDFMaxUpload != 100<<20 {
		t.Errorf("DefaultPDFMaxUpload = %d, want 100 MiB", DefaultPDFMaxUpload)
	}
	// The ordinary JSON endpoints keep their small request limit.
	big := bytes.Repeat([]byte("x"), 128<<10)
	rec := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodPost, "/v1/fetch", bytes.NewReader(append([]byte(`{"url":"`), append(big, []byte(`"}`)...)...)))
	req.Header.Set("Authorization", "Bearer "+r.fleet)
	r.s.ServeHTTP(rec, req)
	if rec.Code == 200 {
		t.Error("a 128 KiB /v1/fetch body was accepted; the JSON limit must still apply there")
	}
}

func TestExtractRestrictedPartition(t *testing.T) {
	r := newPDFRig(t)
	pdf := threePDF()
	if code, _ := r.extract(t, r.gs, "", pdf, "application/pdf"); code != 200 {
		t.Fatalf("restricted upload: %d", code)
	}
	r.logs.mu.Lock()
	for _, rec := range r.logs.recs {
		var b strings.Builder
		b.WriteString(rec.Message)
		rec.Attrs(func(a slog.Attr) bool { fmt.Fprintf(&b, " %s=%v", a.Key, a.Value); return true })
		if strings.Contains(b.String(), "Three Pages") || strings.Contains(b.String(), "quick brown") {
			t.Errorf("an upload's log line carries document text: %q", b.String())
		}
	}
	r.logs.mu.Unlock()
	if code, _ := r.extract(t, r.fleet, "", pdf, "application/pdf"); code != 200 || r.runs() != 2 {
		t.Errorf("fleet after restricted: %d, %d extractions; want 200 and 2 (separate partitions)", code, r.runs())
	}
}