package handler

import (
	"bytes"
	"net/http"
	"net/http/httptest"
	"testing"
)

func TestSavingsHandler_CreateCategory_InvalidBody(t *testing.T) {
	req := httptest.NewRequest("POST", "/savings/categories", bytes.NewBufferString("not json"))
	rr := httptest.NewRecorder()

	h := &SavingsHandler{repo: nil}
	h.CreateCategory(rr, req)

	if rr.Code != http.StatusBadRequest {
		t.Errorf("expected 400, got %d", rr.Code)
	}
}

func TestSavingsHandler_CreateCategory_EmptyName(t *testing.T) {
	body := `{"name":""}`
	req := httptest.NewRequest("POST", "/savings/categories", bytes.NewBufferString(body))
	rr := httptest.NewRecorder()

	h := &SavingsHandler{repo: nil}
	h.CreateCategory(rr, req)

	if rr.Code != http.StatusBadRequest {
		t.Errorf("expected 400, got %d", rr.Code)
	}
}

func TestSavingsHandler_CreateTransaction_InvalidBody(t *testing.T) {
	req := httptest.NewRequest("POST", "/savings/transactions", bytes.NewBufferString("bad"))
	rr := httptest.NewRecorder()

	h := &SavingsHandler{repo: nil}
	h.CreateTransaction(rr, req)

	if rr.Code != http.StatusBadRequest {
		t.Errorf("expected 400, got %d", rr.Code)
	}
}

func TestSavingsHandler_CreateTransaction_Validation(t *testing.T) {
	tests := []struct {
		name string
		body string
	}{
		{"missing category_id", `{"amount": 100, "type": "deposit", "date": "2026-01-01"}`},
		{"zero amount", `{"category_id": 1, "amount": 0, "type": "deposit", "date": "2026-01-01"}`},
		{"negative amount", `{"category_id": 1, "amount": -10, "type": "deposit", "date": "2026-01-01"}`},
		{"invalid type", `{"category_id": 1, "amount": 100, "type": "invalid", "date": "2026-01-01"}`},
		{"missing date", `{"category_id": 1, "amount": 100, "type": "deposit", "date": ""}`},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			req := httptest.NewRequest("POST", "/savings/transactions", bytes.NewBufferString(tt.body))
			rr := httptest.NewRecorder()

			h := &SavingsHandler{repo: nil}
			h.CreateTransaction(rr, req)

			if rr.Code != http.StatusBadRequest {
				t.Errorf("expected 400, got %d", rr.Code)
			}
		})
	}
}

func TestSavingsHandler_UpdateCategory_InvalidBody(t *testing.T) {
	req := httptest.NewRequest("PUT", "/savings/categories/1", bytes.NewBufferString("bad"))
	rr := httptest.NewRecorder()

	h := &SavingsHandler{repo: nil}
	h.UpdateCategory(rr, req)

	// No chi route params → will fail on ParseInt → 400
	if rr.Code != http.StatusBadRequest {
		t.Errorf("expected 400, got %d", rr.Code)
	}
}

func TestSavingsHandler_CreateRecurringPlan_InvalidBody(t *testing.T) {
	req := httptest.NewRequest("POST", "/savings/categories/1/plans", bytes.NewBufferString("bad"))
	rr := httptest.NewRecorder()

	h := &SavingsHandler{repo: nil}
	h.CreateRecurringPlan(rr, req)

	if rr.Code != http.StatusBadRequest {
		t.Errorf("expected 400, got %d", rr.Code)
	}
}