package providers

import (
	"context"
	"encoding/json"
	"io"
	"net/http"
	"net/http/httptest"
	"reflect"
	"testing"
)

func TestAniListMapsMatch(t *testing.T) {
	var gotMethod string
	var gotBody []byte
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		gotMethod = r.Method
		gotBody, _ = io.ReadAll(r.Body)
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte(`{"data":{"Page":{"media":[
			{"id": 12345,
			 "title": {"romaji": "Romaji Name", "english": "", "native": "Native Name"},
			 "description": "A <i>bold</i> start<br>and a line &amp; more.",
			 "coverImage": {"large": "https://img/anime.jpg"},
			 "startDate": {"year": 2001}},
			{"id": 6789,
			 "title": {"romaji": "", "english": "", "native": "Native Only"},
			 "description": "Native.",
			 "coverImage": {"large": "https://img/native.jpg"},
			 "startDate": {"year": 2004}}
		]}}}`))
	}))
	t.Cleanup(srv.Close)

	p := NewAniList()
	p.BaseURL = srv.URL

	cands, err := p.Search(context.Background(), Query{Title: "  something  ", Year: 2001})
	if err != nil {
		t.Fatalf("Search: %v", err)
	}
	want := []Candidate{
		{
			Provider:    "anilist",
			ExternalID:  "anime/12345",
			Title:       "Romaji Name", // english empty, falls back to romaji
			Year:        2001,
			Description: "A bold startand a line & more.", // tags stripped, entity decoded
			CoverURL:    "https://img/anime.jpg",
		},
		{
			Provider:    "anilist",
			ExternalID:  "anime/6789",
			Title:       "Native Only", // both english and romaji empty
			Year:        2004,
			Description: "Native.",
			CoverURL:    "https://img/native.jpg",
		},
	}
	if !reflect.DeepEqual(cands, want) {
		t.Errorf("candidates = %+v, want %+v", cands, want)
	}

	if gotMethod != http.MethodPost {
		t.Errorf("method = %s, want POST", gotMethod)
	}
	var body struct {
		Query     string `json:"query"`
		Variables struct {
			Search  string `json:"search"`
			IsAdult bool   `json:"isAdult"`
			Year    string `json:"year"`
		} `json:"variables"`
	}
	if err := json.Unmarshal(gotBody, &body); err != nil {
		t.Fatalf("request body: %v", err)
	}
	if body.Variables.Search != "something" {
		t.Errorf("search = %q, want trimmed title", body.Variables.Search)
	}
	if !body.Variables.IsAdult {
		t.Errorf("isAdult = false, want true")
	}
	if body.Variables.Year != "2001%" {
		t.Errorf("year = %q, want 2001%%", body.Variables.Year)
	}
}

func TestAniListEmptyResultIsNotError(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte(`{"data":{"Page":{"media":[]}}}`))
	}))
	t.Cleanup(srv.Close)

	p := NewAniList()
	p.BaseURL = srv.URL

	cands, err := p.Search(context.Background(), Query{Title: "nothing"})
	if err != nil {
		t.Fatalf("Search: %v", err)
	}
	if len(cands) != 0 {
		t.Errorf("got %d candidates, want 0", len(cands))
	}
}

func TestAniListBlankTitleSkipsRequest(t *testing.T) {
	var calls int
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		calls++
	}))
	t.Cleanup(srv.Close)

	p := NewAniList()
	p.BaseURL = srv.URL

	cands, err := p.Search(context.Background(), Query{Title: "   "})
	if err != nil {
		t.Fatalf("Search: %v", err)
	}
	if cands != nil {
		t.Errorf("got %v, want nil", cands)
	}
	if calls != 0 {
		t.Errorf("server got %d requests, want 0", calls)
	}
}

func TestAniListErrorsArrayIsError(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte(`{"errors":[{"message":"Not Found."}]}`))
	}))
	t.Cleanup(srv.Close)

	p := NewAniList()
	p.BaseURL = srv.URL

	if _, err := p.Search(context.Background(), Query{Title: "x"}); err == nil {
		t.Fatal("Search: got nil error, want error")
	}
}