package main

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

func TestShiftsCRUDHandler(t *testing.T) {
	app := testApp(t)
	admin := testAdminUser(t, app)
	token := testToken(t, app, admin)
	mux := testMux(app)

	dept, _ := app.createDepartment(Department{Name: "Gate"})

	// Create
	req := testAuthRequest("POST", "/api/shifts", map[string]any{
		"department_id": dept.ID,
		"name":          "Morning",
		"day":           "2026-03-15",
		"start_time":    "08:00",
		"end_time":      "12:00",
		"capacity":      5,
	}, token)
	w := httptest.NewRecorder()
	mux.ServeHTTP(w, req)
	if w.Code != http.StatusCreated {
		t.Fatalf("create: status = %d\nbody: %s", w.Code, w.Body.String())
	}

	// List
	req = testAuthRequest("GET", "/api/shifts", nil, token)
	w = httptest.NewRecorder()
	mux.ServeHTTP(w, req)
	if w.Code != http.StatusOK {
		t.Fatalf("list: status = %d", w.Code)
	}

	// Delete
	req = testAuthRequest("DELETE", "/api/shifts/1", nil, token)
	w = httptest.NewRecorder()
	mux.ServeHTTP(w, req)
	if w.Code != http.StatusNoContent {
		t.Errorf("delete: status = %d", w.Code)
	}
}

func TestShiftAssignVolunteer(t *testing.T) {
	app := testApp(t)
	admin := testAdminUser(t, app)
	token := testToken(t, app, admin)
	mux := testMux(app)

	dept, _ := app.createDepartment(Department{Name: "Gate"})
	deptID := dept.ID
	app.createShift(Shift{DepartmentID: deptID, Name: "AM", Day: "2026-03-15", StartTime: "08:00", EndTime: "12:00"})
	app.createVolunteer(Volunteer{Name: "Alice", DepartmentID: &deptID})

	// Assign
	req := testAuthRequest("POST", "/api/shifts/1/volunteers", map[string]any{
		"volunteer_id": 1,
	}, token)
	w := httptest.NewRecorder()
	mux.ServeHTTP(w, req)
	if w.Code != http.StatusNoContent {
		t.Fatalf("assign: status = %d\nbody: %s", w.Code, w.Body.String())
	}

	// Unassign
	req = testAuthRequest("DELETE", "/api/shifts/1/volunteers/1", nil, token)
	w = httptest.NewRecorder()
	mux.ServeHTTP(w, req)
	if w.Code != http.StatusNoContent {
		t.Errorf("unassign: status = %d", w.Code)
	}
}

func TestShiftAssignConflict(t *testing.T) {
	app := testApp(t)
	admin := testAdminUser(t, app)
	token := testToken(t, app, admin)
	mux := testMux(app)

	dept, _ := app.createDepartment(Department{Name: "Gate"})
	deptID := dept.ID
	app.createShift(Shift{DepartmentID: deptID, Name: "AM", Day: "2026-03-15", StartTime: "08:00", EndTime: "12:00"})
	app.createShift(Shift{DepartmentID: deptID, Name: "Overlap", Day: "2026-03-15", StartTime: "10:00", EndTime: "14:00"})
	app.createVolunteer(Volunteer{Name: "Alice", DepartmentID: &deptID})

	// Assign to first shift
	app.assignShift(1, 1)

	// Try to assign to overlapping shift — should get 409
	req := testAuthRequest("POST", "/api/shifts/2/volunteers", map[string]any{
		"volunteer_id": 1,
	}, token)
	w := httptest.NewRecorder()
	mux.ServeHTTP(w, req)
	if w.Code != http.StatusConflict {
		t.Fatalf("conflict: status = %d, want 409", w.Code)
	}
}

func TestShiftReorder(t *testing.T) {
	app := testApp(t)
	admin := testAdminUser(t, app)
	token := testToken(t, app, admin)
	mux := testMux(app)

	dept, _ := app.createDepartment(Department{Name: "Gate"})
	deptID := dept.ID
	app.createShift(Shift{DepartmentID: deptID, Name: "A", Day: "2026-03-15", StartTime: "08:00", EndTime: "12:00"})
	app.createShift(Shift{DepartmentID: deptID, Name: "B", Day: "2026-03-15", StartTime: "12:00", EndTime: "16:00"})

	req := testAuthRequest("POST", "/api/shifts/reorder", []map[string]int{
		{"id": 1, "position": 2},
		{"id": 2, "position": 1},
	}, token)
	w := httptest.NewRecorder()
	mux.ServeHTTP(w, req)
	if w.Code != http.StatusNoContent {
		t.Errorf("reorder: status = %d\nbody: %s", w.Code, w.Body.String())
	}

	s1, _ := app.getShift(1)
	s2, _ := app.getShift(2)
	if s1.Position != 2 || s2.Position != 1 {
		t.Errorf("positions: s1=%d, s2=%d, want 2,1", s1.Position, s2.Position)
	}
}