package setup_test

import (
	"bytes"
	"context"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"testing"

	"git.unsupervised.ca/walkies/internal/setup"
)

// ---- fakes ---------------------------------------------------------------

type fakeStore struct {
	needsSetup     bool
	needsSetupErr  error
	createAdminID  int64
	createAdminErr error
}

func (f *fakeStore) NeedsSetup(_ context.Context) (bool, error) {
	return f.needsSetup, f.needsSetupErr
}

func (f *fakeStore) CreateAdmin(_ context.Context, _, _, _ string) (int64, error) {
	return f.createAdminID, f.createAdminErr
}

type fakeTokenIssuer struct {
	token string
	err   error
}

func (f *fakeTokenIssuer) IssueToken(_ int64, _ string) (string, error) {
	return f.token, f.err
}

// Compile-time interface checks.
var _ setup.Storer = (*fakeStore)(nil)
var _ setup.TokenIssuer = (*fakeTokenIssuer)(nil)

// ---- helpers -------------------------------------------------------------

func do(t *testing.T, handler http.HandlerFunc, method, path, body string) *httptest.ResponseRecorder {
	t.Helper()
	var b *bytes.Reader
	if body != "" {
		b = bytes.NewReader([]byte(body))
	} else {
		b = bytes.NewReader(nil)
	}
	req := httptest.NewRequest(method, path, b)
	if body != "" {
		req.Header.Set("Content-Type", "application/json")
	}
	w := httptest.NewRecorder()
	handler.ServeHTTP(w, req)
	return w
}

// ---- Status tests --------------------------------------------------------

func TestStatus_NeedsSetup(t *testing.T) {
	h := setup.NewHandlerFromInterfaces(
		&fakeStore{needsSetup: true},
		&fakeTokenIssuer{},
	)
	w := do(t, h.Status, "GET", "/api/v1/setup/status", "")

	if w.Code != http.StatusOK {
		t.Fatalf("expected 200, got %d: %s", w.Code, w.Body)
	}
	var resp map[string]bool
	json.NewDecoder(w.Body).Decode(&resp)
	if !resp["needs_setup"] {
		t.Error("expected needs_setup=true")
	}
}

func TestStatus_SetupDone(t *testing.T) {
	h := setup.NewHandlerFromInterfaces(
		&fakeStore{needsSetup: false},
		&fakeTokenIssuer{},
	)
	w := do(t, h.Status, "GET", "/api/v1/setup/status", "")

	if w.Code != http.StatusOK {
		t.Fatalf("expected 200, got %d: %s", w.Code, w.Body)
	}
	var resp map[string]bool
	json.NewDecoder(w.Body).Decode(&resp)
	if resp["needs_setup"] {
		t.Error("expected needs_setup=false")
	}
}

// ---- CreateAdmin tests ---------------------------------------------------

func TestCreateAdmin_Success(t *testing.T) {
	h := setup.NewHandlerFromInterfaces(
		&fakeStore{createAdminID: 1},
		&fakeTokenIssuer{token: "jwt-token"},
	)
	w := do(t, h.CreateAdmin, "POST", "/api/v1/setup/admin",
		`{"name":"Admin","email":"admin@example.com","password":"supersecret"}`)

	if w.Code != http.StatusCreated {
		t.Fatalf("expected 201, got %d: %s", w.Code, w.Body)
	}
	var resp map[string]string
	json.NewDecoder(w.Body).Decode(&resp)
	if resp["token"] != "jwt-token" {
		t.Errorf("expected token jwt-token, got %q", resp["token"])
	}
}

func TestCreateAdmin_AlreadyDone(t *testing.T) {
	h := setup.NewHandlerFromInterfaces(
		&fakeStore{createAdminErr: setup.ErrSetupAlreadyDone},
		&fakeTokenIssuer{},
	)
	w := do(t, h.CreateAdmin, "POST", "/api/v1/setup/admin",
		`{"name":"Admin","email":"admin@example.com","password":"supersecret"}`)

	if w.Code != http.StatusForbidden {
		t.Fatalf("expected 403, got %d: %s", w.Code, w.Body)
	}
}

func TestCreateAdmin_MissingFields(t *testing.T) {
	h := setup.NewHandlerFromInterfaces(
		&fakeStore{},
		&fakeTokenIssuer{},
	)

	tests := []struct {
		name string
		body string
	}{
		{"missing name", `{"email":"a@b.com","password":"supersecret"}`},
		{"missing email", `{"name":"Admin","password":"supersecret"}`},
		{"missing password", `{"name":"Admin","email":"a@b.com"}`},
	}

	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			w := do(t, h.CreateAdmin, "POST", "/api/v1/setup/admin", tc.body)
			if w.Code != http.StatusBadRequest {
				t.Fatalf("expected 400, got %d: %s", w.Code, w.Body)
			}
		})
	}
}

func TestCreateAdmin_PasswordTooShort(t *testing.T) {
	h := setup.NewHandlerFromInterfaces(
		&fakeStore{},
		&fakeTokenIssuer{},
	)
	w := do(t, h.CreateAdmin, "POST", "/api/v1/setup/admin",
		`{"name":"Admin","email":"admin@example.com","password":"short"}`)

	if w.Code != http.StatusBadRequest {
		t.Fatalf("expected 400, got %d: %s", w.Code, w.Body)
	}
}