package main

import (
	"context"
	"crypto/sha256"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"strconv"
	"strings"
	"testing"
)

func TestSearchItemsContinuesWhenServerCapsLimit(t *testing.T) {
	var offsets []int
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Path != "/api/v1/sec/item/search" {
			t.Fatalf("unexpected path: %s", r.URL.Path)
		}
		var req struct {
			Offset int `json:"offset"`
			Limit  int `json:"limit"`
		}
		if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
			t.Fatal(err)
		}
		offsets = append(offsets, req.Offset)
		count := 200
		if req.Offset >= 400 {
			count = 0
		}
		items := make([]SearchItem, count)
		for i := range items {
			items[i] = SearchItem{ID: strconv.Itoa(req.Offset + i)}
		}
		_ = json.NewEncoder(w).Encode(map[string]any{
			"groups": []map[string]any{{"items": items}},
			"limit":  200,
			"offset": req.Offset,
		})
	}))
	defer server.Close()

	client := NewDocspellClient(server.URL, "")
	items, err := client.SearchItems(context.Background(), "*", 1000)
	if err != nil {
		t.Fatal(err)
	}
	if len(items) != 400 {
		t.Fatalf("expected 400 items, got %d", len(items))
	}
	wantOffsets := []int{0, 200, 400}
	if len(offsets) != len(wantOffsets) {
		t.Fatalf("expected offsets %v, got %v", wantOffsets, offsets)
	}
	for i := range wantOffsets {
		if offsets[i] != wantOffsets[i] {
			t.Fatalf("expected offsets %v, got %v", wantOffsets, offsets)
		}
	}
}

func TestFileExistsUsesAuthenticatedChecksumEndpoint(t *testing.T) {
	file := filepath.Join(t.TempDir(), "doc.txt")
	content := []byte("hello docspell")
	if err := os.WriteFile(file, content, 0644); err != nil {
		t.Fatal(err)
	}
	wantHash := fmt.Sprintf("%x", sha256.Sum256(content))

	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method != http.MethodGet {
			t.Fatalf("expected GET, got %s", r.Method)
		}
		if r.URL.Path != "/api/v1/sec/checkfile/"+wantHash {
			t.Fatalf("unexpected path: %s", r.URL.Path)
		}
		if r.Header.Get(defaultDocspellAuthHeader) != "token-1" {
			t.Fatalf("missing auth header: %q", r.Header.Get(defaultDocspellAuthHeader))
		}
		_ = json.NewEncoder(w).Encode(FileExistsResult{
			Exists: true,
			Items:  []DocspellItem{{ID: "item-1", Name: "Invoice", State: "confirmed", ItemDate: 1720396800000}},
		})
	}))
	defer server.Close()

	client := NewDocspellClient(server.URL, "")
	client.Token = "token-1"
	got, err := client.FileExists(context.Background(), file)
	if err != nil {
		t.Fatal(err)
	}
	if !got.Exists || got.Items[0].ID != "item-1" {
		t.Fatalf("unexpected result: %#v", got)
	}
	if got.File == "" {
		t.Fatal("expected local file path to be populated")
	}
}

func TestUploadFileUsesAuthenticatedMultipartEndpoint(t *testing.T) {
	file := filepath.Join(t.TempDir(), "upload.txt")
	if err := os.WriteFile(file, []byte("upload body"), 0644); err != nil {
		t.Fatal(err)
	}

	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method != http.MethodPost {
			t.Fatalf("expected POST, got %s", r.Method)
		}
		if r.URL.Path != "/api/v1/sec/upload/item" {
			t.Fatalf("unexpected path: %s", r.URL.Path)
		}
		if r.Header.Get(defaultDocspellAuthHeader) != "token-1" {
			t.Fatalf("missing auth header: %q", r.Header.Get(defaultDocspellAuthHeader))
		}
		if !strings.HasPrefix(r.Header.Get("Content-Type"), "multipart/form-data") {
			t.Fatalf("expected multipart content type, got %q", r.Header.Get("Content-Type"))
		}
		if err := r.ParseMultipartForm(10 << 20); err != nil {
			t.Fatal(err)
		}
		var meta UploadMeta
		if err := json.Unmarshal([]byte(r.FormValue("meta")), &meta); err != nil {
			t.Fatal(err)
		}
		if !meta.Multiple {
			t.Fatalf("expected multiple upload meta, got %#v", meta)
		}
		parts := r.MultipartForm.File["file"]
		if len(parts) != 1 || parts[0].Filename != "upload.txt" {
			t.Fatalf("unexpected file parts: %#v", parts)
		}
		opened, err := parts[0].Open()
		if err != nil {
			t.Fatal(err)
		}
		defer opened.Close()
		data, err := io.ReadAll(opened)
		if err != nil {
			t.Fatal(err)
		}
		if string(data) != "upload body" {
			t.Fatalf("unexpected upload body %q", string(data))
		}
		_ = json.NewEncoder(w).Encode(BasicResult{Success: true, Message: "ok"})
	}))
	defer server.Close()

	client := NewDocspellClient(server.URL, "")
	client.Token = "token-1"
	got, err := client.UploadFile(context.Background(), file, UploadMeta{Multiple: true})
	if err != nil {
		t.Fatal(err)
	}
	if !got.Success {
		t.Fatalf("expected success, got %#v", got)
	}
}