package template

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

func TestListTemplatesReturnsTemplates(t *testing.T) {
	repository := &stubRepository{
		templates: []Template{{
			ID:                  "tmpl-1",
			ClusterID:           "cluster-1",
			Name:                "ubuntu-24.04",
			Description:         "Ubuntu 24.04 LTS",
			ProxmoxTemplateVMID: 9000,
			ProxmoxNode:         "pve1",
			CreatedAt:           time.Date(2026, 6, 11, 12, 0, 0, 0, time.UTC),
		}},
	}
	handler := NewHandler(repository)
	req := httptest.NewRequest(http.MethodGet, "/internal/templates", nil)
	rec := httptest.NewRecorder()

	handler.ListTemplates(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("status = %d, want %d", rec.Code, http.StatusOK)
	}

	var response struct {
		Data []Template `json:"data"`
	}
	if err := json.Unmarshal(rec.Body.Bytes(), &response); err != nil {
		t.Fatalf("unmarshal response: %v", err)
	}
	if len(response.Data) != 1 {
		t.Fatalf("len(data) = %d, want 1", len(response.Data))
	}
	if response.Data[0].ID != "tmpl-1" {
		t.Fatalf("template ID = %q, want tmpl-1", response.Data[0].ID)
	}
}

func TestListTemplatesReturnsEmptyList(t *testing.T) {
	handler := NewHandler(&stubRepository{templates: []Template{}})
	req := httptest.NewRequest(http.MethodGet, "/internal/templates", nil)
	rec := httptest.NewRecorder()

	handler.ListTemplates(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("status = %d, want %d", rec.Code, http.StatusOK)
	}
}

func TestCreateTemplateReturnsCreated(t *testing.T) {
	repository := &stubRepository{
		upsertResult: Template{
			ID:                  "tmpl-1",
			ClusterID:           "cluster-1",
			Name:                "ubuntu-24.04",
			Description:         "Ubuntu 24.04 LTS",
			ProxmoxTemplateVMID: 9000,
			ProxmoxNode:         "pve1",
		},
	}
	handler := NewHandler(repository)
	body := `{"cluster_id":"cluster-1","name":"ubuntu-24.04","description":"Ubuntu 24.04 LTS","proxmox_template_vmid":9000,"proxmox_node":"pve1"}`
	req := httptest.NewRequest(http.MethodPost, "/internal/templates", io.NopCloser(strings.NewReader(body)))
	rec := httptest.NewRecorder()

	handler.CreateTemplate(rec, req)

	if rec.Code != http.StatusCreated {
		t.Fatalf("status = %d, want %d", rec.Code, http.StatusCreated)
	}

	var response Template
	if err := json.Unmarshal(rec.Body.Bytes(), &response); err != nil {
		t.Fatalf("unmarshal response: %v", err)
	}
	if response.ID != "tmpl-1" {
		t.Fatalf("template ID = %q, want tmpl-1", response.ID)
	}
}

func TestCreateTemplateRejectsEmptyName(t *testing.T) {
	handler := NewHandler(&stubRepository{})
	body := `{"cluster_id":"cluster-1","name":"","proxmox_template_vmid":9000}`
	req := httptest.NewRequest(http.MethodPost, "/internal/templates", io.NopCloser(strings.NewReader(body)))
	rec := httptest.NewRecorder()

	handler.CreateTemplate(rec, req)

	if rec.Code != http.StatusBadRequest {
		t.Fatalf("status = %d, want %d", rec.Code, http.StatusBadRequest)
	}
}

func TestUpdateTemplateReturnsUpdated(t *testing.T) {
	repository := &stubRepository{
		getFound: true,
		getResult: Template{
			ID:                  "tmpl-1",
			ClusterID:           "cluster-1",
			Name:                "ubuntu-24.04",
			Description:         "Ubuntu 24.04 LTS",
			ProxmoxTemplateVMID: 9000,
			ProxmoxNode:         "pve1",
		},
		upsertResult: Template{
			ID:                  "tmpl-1",
			ClusterID:           "cluster-1",
			Name:                "ubuntu-24.04-updated",
			Description:         "Updated",
			ProxmoxTemplateVMID: 9000,
			ProxmoxNode:         "pve1",
		},
	}
	handler := NewHandler(repository)
	body := `{"name":"ubuntu-24.04-updated","description":"Updated"}`
	req := httptest.NewRequest(http.MethodPut, "/internal/templates/tmpl-1", io.NopCloser(strings.NewReader(body)))
	req.SetPathValue("templateID", "tmpl-1")
	rec := httptest.NewRecorder()

	handler.UpdateTemplate(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("status = %d, want %d", rec.Code, http.StatusOK)
	}
	var response Template
	if err := json.Unmarshal(rec.Body.Bytes(), &response); err != nil {
		t.Fatalf("unmarshal response: %v", err)
	}
	if response.Name != "ubuntu-24.04-updated" {
		t.Fatalf("name = %q, want ubuntu-24.04-updated", response.Name)
	}
}

func TestUpdateTemplateReturnsNotFound(t *testing.T) {
	handler := NewHandler(&stubRepository{getFound: false})
	body := `{"name":"updated"}`
	req := httptest.NewRequest(http.MethodPut, "/internal/templates/tmpl-xxx", io.NopCloser(strings.NewReader(body)))
	req.SetPathValue("templateID", "tmpl-xxx")
	rec := httptest.NewRecorder()

	handler.UpdateTemplate(rec, req)

	if rec.Code != http.StatusNotFound {
		t.Fatalf("status = %d, want %d", rec.Code, http.StatusNotFound)
	}
}

func TestDeleteTemplateReturnsNoContent(t *testing.T) {
	handler := NewHandler(&stubRepository{deleteResult: true})
	req := httptest.NewRequest(http.MethodDelete, "/internal/templates/tmpl-1", nil)
	req.SetPathValue("templateID", "tmpl-1")
	rec := httptest.NewRecorder()

	handler.DeleteTemplate(rec, req)

	if rec.Code != http.StatusNoContent {
		t.Fatalf("status = %d, want %d", rec.Code, http.StatusNoContent)
	}
}

func TestDeleteTemplateReturnsNotFound(t *testing.T) {
	handler := NewHandler(&stubRepository{deleteResult: false})
	req := httptest.NewRequest(http.MethodDelete, "/internal/templates/tmpl-xxx", nil)
	req.SetPathValue("templateID", "tmpl-xxx")
	rec := httptest.NewRecorder()

	handler.DeleteTemplate(rec, req)

	if rec.Code != http.StatusNotFound {
		t.Fatalf("status = %d, want %d", rec.Code, http.StatusNotFound)
	}
}

type stubRepository struct {
	templates    []Template
	getFound     bool
	getResult    Template
	upsertResult Template
	deleteResult bool
}

func (s *stubRepository) List(_ context.Context) ([]Template, error) {
	return s.templates, nil
}

func (s *stubRepository) Get(_ context.Context, _ string) (Template, bool, error) {
	return s.getResult, s.getFound, nil
}

func (s *stubRepository) Upsert(_ context.Context, _ Template) (Template, error) {
	return s.upsertResult, nil
}

func (s *stubRepository) Delete(_ context.Context, _ string) (bool, error) {
	return s.deleteResult, nil
}