package forge

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

func TestClient_Good_Get(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method != http.MethodGet {
			t.Errorf("expected GET, got %s", r.Method)
		}
		if r.Header.Get("Authorization") != "token test-token" {
			t.Errorf("missing auth header")
		}
		if r.URL.Path != "/api/v1/user" {
			t.Errorf("wrong path: %s", r.URL.Path)
		}
		json.NewEncoder(w).Encode(map[string]string{"login": "virgil"})
	}))
	defer srv.Close()

	c := NewClient(srv.URL, "test-token")
	var out map[string]string
	err := c.Get(context.Background(), "/api/v1/user", &out)
	if err != nil {
		t.Fatal(err)
	}
	if out["login"] != "virgil" {
		t.Errorf("got login=%q", out["login"])
	}
}

func TestClient_Good_Post(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method != http.MethodPost {
			t.Errorf("expected POST, got %s", r.Method)
		}
		var body map[string]string
		json.NewDecoder(r.Body).Decode(&body)
		if body["name"] != "test-repo" {
			t.Errorf("wrong body: %v", body)
		}
		w.WriteHeader(http.StatusCreated)
		json.NewEncoder(w).Encode(map[string]any{"id": 1, "name": "test-repo"})
	}))
	defer srv.Close()

	c := NewClient(srv.URL, "test-token")
	body := map[string]string{"name": "test-repo"}
	var out map[string]any
	err := c.Post(context.Background(), "/api/v1/orgs/core/repos", body, &out)
	if err != nil {
		t.Fatal(err)
	}
	if out["name"] != "test-repo" {
		t.Errorf("got name=%v", out["name"])
	}
}

func TestClient_Good_Delete(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method != http.MethodDelete {
			t.Errorf("expected DELETE, got %s", r.Method)
		}
		w.WriteHeader(http.StatusNoContent)
	}))
	defer srv.Close()

	c := NewClient(srv.URL, "test-token")
	err := c.Delete(context.Background(), "/api/v1/repos/core/test")
	if err != nil {
		t.Fatal(err)
	}
}

func TestClient_Bad_ServerError(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusInternalServerError)
		json.NewEncoder(w).Encode(map[string]string{"message": "internal error"})
	}))
	defer srv.Close()

	c := NewClient(srv.URL, "test-token")
	err := c.Get(context.Background(), "/api/v1/user", nil)
	if err == nil {
		t.Fatal("expected error")
	}
	var apiErr *APIError
	if !errors.As(err, &apiErr) {
		t.Fatalf("expected APIError, got %T", err)
	}
	if apiErr.StatusCode != 500 {
		t.Errorf("got status=%d", apiErr.StatusCode)
	}
}

func TestClient_Bad_NotFound(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusNotFound)
		json.NewEncoder(w).Encode(map[string]string{"message": "not found"})
	}))
	defer srv.Close()

	c := NewClient(srv.URL, "test-token")
	err := c.Get(context.Background(), "/api/v1/repos/x/y", nil)
	if !IsNotFound(err) {
		t.Fatalf("expected not found, got %v", err)
	}
}

func TestClient_Good_ContextCancellation(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		<-r.Context().Done()
	}))
	defer srv.Close()

	c := NewClient(srv.URL, "test-token")
	ctx, cancel := context.WithCancel(context.Background())
	cancel() // cancel immediately
	err := c.Get(ctx, "/api/v1/user", nil)
	if err == nil {
		t.Fatal("expected error from cancelled context")
	}
}

func TestClient_Good_Options(t *testing.T) {
	c := NewClient("https://forge.lthn.ai", "tok",
		WithUserAgent("go-forge/1.0"),
	)
	if c.userAgent != "go-forge/1.0" {
		t.Errorf("got user agent=%q", c.userAgent)
	}
}