// app/api/visa/route.ts

import { NextRequest, NextResponse } from "next/server";

// ==================== INTERFACES ====================

interface VisaItem {
  title: string;
  description: string;
}

interface VisaTypeCategory {
  title?: string;
  items: VisaItem[];
}

interface VisaProcessStep {
  number: string;
  title: string;
  description: string;
}

interface VisaProcess {
  title: string;
  steps: VisaProcessStep[];
}

interface VisaCategory {
  title: string;
  steps: string[][];
}

interface VisaService {
  title: string;
  steps: VisaProcessStep[];
}

interface RelatedCountry {
  id: number;
  name: string;
  icon: string;
}

interface ContactInfo {
  sectionTitle: string;
  helpText: string;
  img: string;
  phone: {
    label: string;
    value: string;
    link: string;
  };
  email: {
    label: string;
    value: string;
    link: string;
  };
  location: {
    label: string;
    address: string;
  };
}

interface ActiveCountry {
  id: number;
  name: string;
  title: string;
  mainImage: string;
  description: string;
  additionalInfo: string;
  tagline: string;
  visaTypes: VisaTypeCategory[];
  visaProcess: VisaProcess;
  gallery: string[];
  visaCategories: VisaCategory;
  visaService: VisaService;
}

export interface DetailedView {
  activeCountry: ActiveCountry;
  relatedCountries: RelatedCountry[];
  contactInfo: ContactInfo;
}

export interface VisaCountry {
  id: number;
  name: string;
  slug: string;
  icon: string;
  services: string[];
  detailedView?: DetailedView;
}

export interface VisaHero {
  title: string;
  summaryList: VisaCountry[];
}

export interface VisaData {
  hero: VisaHero;
}

export interface VisaApiResponse {
  success: boolean;
  message?: string;
  data?: VisaCountry | VisaCountry[] | VisaHero | null;
  error?: string;
}

export interface VisaInquiry {
  name: string;
  email: string;
  phone: string;
  country: string;
  visaType: string;
}

export interface VisaInquiryResponse {
  success: boolean;
  message: string;
  inquiryId?: string;
  data?: VisaInquiry;
}

// ==================== HELPER FUNCTIONS ====================

const getApiUrl = (): string => {
  return process.env.NEXT_PUBLIC_API_URL || "http://localhost:3001";
};

/**
 * Fetch visa data từ remote API hoặc fallback
 * @param slug - Optional country slug
 * @returns Promise<VisaCountry | VisaCountry[]>
 */
export async function fetchVisaData(): Promise<any> {
  const apiUrl = getApiUrl();
  const url = `${apiUrl}`; // Đảm bảo apiUrl không thừa dấu / ở cuối

  try {
    const response = await fetch(`${url}/api/visa`, {
      method: "GET",
      headers: { "Content-Type": "application/json" },
      cache: "no-store",
    });

    if (!response.ok) throw new Error(`API returned ${response.status}`);

    const apiResponse = await response.json();

    if (!apiResponse.success || !apiResponse.hero) {
      throw new Error("Dữ liệu API không đúng cấu trúc");
    }

    // Hàm bổ trợ để nối URL chuẩn
    const fixUrl = (path: string) => {
      if (!path || path.startsWith("http")) return path;
      return `${url}${path.startsWith("/") ? "" : "/"}${path}`;
    };

    // Duyệt qua danh sách summaryList để ghi đè toàn bộ ảnh
    if (apiResponse.hero.summaryList) {
      apiResponse.hero.summaryList = apiResponse.hero.summaryList.map(
        (country: any) => {
          // 1. Fix icon cấp gốc
          const updatedCountry = {
            ...country,
            icon: fixUrl(country.icon),
          };

          // 2. Fix sâu trong detailedView (nếu có)
          if (updatedCountry.detailedView) {
            const dv = updatedCountry.detailedView;

            updatedCountry.detailedView = {
              ...dv,
              // Fix ảnh trong activeCountry
              activeCountry: dv.activeCountry
                ? {
                    ...dv.activeCountry,
                    mainImage: fixUrl(dv.activeCountry.mainImage),
                    gallery: dv.activeCountry.gallery?.map(fixUrl),
                  }
                : dv.activeCountry,

              // Fix icon trong danh sách nước liên quan
              relatedCountries: dv.relatedCountries?.map((rc: any) => ({
                ...rc,
                icon: fixUrl(rc.icon),
              })),

              // Fix ảnh nền trong contactInfo
              contactInfo: dv.contactInfo
                ? {
                    ...dv.contactInfo,
                    img: fixUrl(dv.contactInfo.img),
                  }
                : dv.contactInfo,
            };
          }

          return updatedCountry;
        },
      );
    }

    return apiResponse;
  } catch (error) {
    console.error("❌ Error fetching:", error);
    return getFallbackVisaData();
  }
}
// ==================== FALLBACK DATA ====================

/**
 * Fallback visa data - được dùng khi API không hoạt động
 */
function getFallbackVisaData(): VisaData {
  return {
    hero: {
      title: "Visa Services ",
      summaryList: [
        {
          id: 1,
          name: "France",
          slug: "france",
          icon: "/assets/img/home-2/visa/03.png",
          services: [
            "Student Visa & Admission",
            "Work Visa – H1B",
            "Work permit for Canada",
            "Student Visa for Canada",
          ],
          detailedView: {
            activeCountry: {
              id: 1,
              name: "France",
              title: "COUNTRY FRANCE",
              mainImage: "/assets/img/inner-page/country-details/details-1.jpg",
              description:
                "France is one of the most popular destinations for international students, offering world-class universities, diverse cultural experiences, and countless career opportunities...",
              additionalInfo:
                "Our consultancy provides complete guidance for study visas, work permits, and permanent residency pathways tailored to your goals.",
              tagline:
                "Over the last 35 Years we made an impact that is strong & we have long way to go.",
              visaTypes: [
                {
                  items: [
                    {
                      title: "Tourist Visa",
                      description:
                        "Broad term that can refer to various aspects of interconnectedness",
                    },
                    {
                      title: "Work Permit",
                      description:
                        "Broad term that can refer to various aspects of interconnectedness",
                    },
                  ],
                },
                {
                  items: [
                    {
                      title: "Student",
                      description:
                        "Broad term that can refer to various aspects of interconnectedness",
                    },
                    {
                      title: "Family Visa",
                      description:
                        "Broad term that can refer to various aspects of interconnectedness",
                    },
                  ],
                },
              ],
              visaProcess: {
                title: "France Visa Process",
                steps: [
                  {
                    number: "01",
                    title: "Consultation & Eligibility Check",
                    description:
                      "Our experts review your profile and visa requirements.",
                  },
                  {
                    number: "02",
                    title: "Application Preparation",
                    description:
                      "We help with document collection, form filling, and statement drafting.",
                  },
                  {
                    number: "03",
                    title: "Submission",
                    description:
                      "Visa application is submitted online with required fees.",
                  },
                  {
                    number: "04",
                    title: "Interview Guidance",
                    description:
                      "Get training and mock sessions for embassy interview.",
                  },
                  {
                    number: "05",
                    title: "Approval & Travel",
                    description:
                      "Once approved, we provide travel and pre-departure guidance.",
                  },
                ],
              },
              gallery: [
                "/assets/img/inner-page/country-details/details-2.jpg",
                "/assets/img/inner-page/country-details/details-3.png",
              ],
              visaCategories: {
                title: "Types of France Visas",
                steps: [
                  [
                    "Student Visa (F1, M1, J1)",
                    "Work Visa (H1B, L1)",
                    "Tourist Visa (B1/B2)",
                  ],
                  [
                    "Family/Spouse Visa (K1, IR1, F2A)",
                    "Green Card / Immigrant Visa",
                  ],
                ],
              },
              visaService: {
                title: "Our France Visa Service Options",
                steps: [
                  {
                    number: "01",
                    title: "Consultation & Eligibility Check",
                    description:
                      "Our experts review your profile and visa requirements.",
                  },
                  {
                    number: "02",
                    title: "Application Preparation",
                    description:
                      "We help with document collection, form filling, and statement drafting.",
                  },
                  {
                    number: "03",
                    title: "Submission",
                    description:
                      "Visa application is submitted online with required fees.",
                  },
                  {
                    number: "04",
                    title: "Interview Guidance",
                    description:
                      "Get training and mock sessions for embassy interview.",
                  },
                  {
                    number: "05",
                    title: "Approval & Travel",
                    description:
                      "Once approved, we provide travel and pre-departure guidance.",
                  },
                ],
              },
            },
            relatedCountries: [
              {
                id: 1,
                name: "Canada",
                icon: "/assets/img/inner-page/country-details/01.png",
              },
              {
                id: 2,
                name: "USA",
                icon: "/assets/img/inner-page/country-details/02.png",
              },
              {
                id: 3,
                name: "UK",
                icon: "/assets/img/inner-page/country-details/03.png",
              },
              {
                id: 4,
                name: "Germany",
                icon: "/assets/img/inner-page/country-details/05.png",
              },
              {
                id: 5,
                name: "Spain",
                icon: "/assets/img/inner-page/country-details/06.png",
              },
            ],
            contactInfo: {
              sectionTitle: "Visa & Immigration",
              helpText: "Need Help? Book Lab Visit",
              img: "/assets/img/inner-page/country-details/bg.jpg",
              phone: {
                label: "Call Us",
                value: "+33 1 23 45 67 89",
                link: "tel:+33123456789",
              },
              email: {
                label: "Mail Us",
                value: "visa@france-consultant.com",
                link: "mailto:visa@france-consultant.com",
              },
              location: {
                label: "Location",
                address: "Paris, Lyon, Marseille",
              },
            },
          },
        },
        {
          id: 2,
          name: "UK",
          slug: "uk",
          icon: "/assets/img/home-2/visa/11.png",
          services: [
            "Student Visa & Admission",
            "Work Visa – Skilled Worker",
            "Family Visa",
            "Entrepreneur Visa",
          ],
          detailedView: {
            activeCountry: {
              id: 2,
              name: "United Kingdom",
              title: "COUNTRY UK",
              mainImage: "/assets/img/inner-page/country-details/details-1.jpg",
              description:
                "The UK is a world leader in education and innovation, offering exceptional universities and career opportunities for international professionals...",
              additionalInfo:
                "We provide comprehensive support for UK student visas, work visas, and family sponsorship applications.",
              tagline: "35+ years of excellence in UK visa consulting.",
              visaTypes: [
                {
                  title: "Student & Work",
                  items: [
                    {
                      title: "Student Visa",
                      description:
                        "Study at UK universities with part-time work opportunities",
                    },
                    {
                      title: "Graduate Visa",
                      description:
                        "Work in the UK after completing your studies",
                    },
                  ],
                },
                {
                  title: "Family & Other",
                  items: [
                    {
                      title: "Skilled Worker Visa",
                      description: "Work in a skilled occupation in the UK",
                    },
                    {
                      title: "Family Visa",
                      description: "Join your family in the UK",
                    },
                  ],
                },
              ],
              visaProcess: {
                title: "UK Visa Process",
                steps: [
                  {
                    number: "01",
                    title: "Eligibility Assessment",
                    description:
                      "We evaluate your qualifications and circumstances.",
                  },
                  {
                    number: "02",
                    title: "Documentation",
                    description:
                      "Comprehensive document preparation and review.",
                  },
                  {
                    number: "03",
                    title: "Application Submission",
                    description: "Submit your visa application online.",
                  },
                  {
                    number: "04",
                    title: "Biometrics & Interview",
                    description: "Complete biometric appointment if required.",
                  },
                  {
                    number: "05",
                    title: "Visa Decision",
                    description: "Receive your visa and start your UK journey.",
                  },
                ],
              },
              gallery: [
                "/assets/img/inner-page/country-details/details-2.jpg",
                "/assets/img/inner-page/country-details/details-3.png",
              ],
              visaCategories: {
                title: "Types of UK Visas",
                steps: [
                  [
                    "Student Visa (Tier 4)",
                    "Graduate Visa",
                    "Skilled Worker Visa",
                  ],
                  ["Family Visa", "Visitor Visa", "Entrepreneur Visa"],
                ],
              },
              visaService: {
                title: "Our UK Visa Services",
                steps: [
                  {
                    number: "01",
                    title: "Initial Consultation",
                    description: "Free assessment of your visa eligibility.",
                  },
                  {
                    number: "02",
                    title: "Document Preparation",
                    description: "Expert guidance on all required documents.",
                  },
                  {
                    number: "03",
                    title: "Application Submission",
                    description: "Professional submission and tracking.",
                  },
                  {
                    number: "04",
                    title: "Interview Coaching",
                    description: "Prepare for your visa interview.",
                  },
                  {
                    number: "05",
                    title: "Post-Visa Support",
                    description: "Guidance for accommodation and settlement.",
                  },
                ],
              },
            },
            relatedCountries: [
              {
                id: 1,
                name: "Canada",
                icon: "/assets/img/inner-page/country-details/01.png",
              },
              {
                id: 2,
                name: "USA",
                icon: "/assets/img/inner-page/country-details/02.png",
              },
              {
                id: 3,
                name: "Australia",
                icon: "/assets/img/inner-page/country-details/03.png",
              },
            ],
            contactInfo: {
              sectionTitle: "UK Visa & Immigration",
              helpText: "Need Help? Book Consultation",
              img: "/assets/img/inner-page/country-details/bg.jpg",
              phone: {
                label: "Call Us",
                value: "+44 20 7946 0958",
                link: "tel:+442079460958",
              },
              email: {
                label: "Mail Us",
                value: "visa@uk-consultant.com",
                link: "mailto:visa@uk-consultant.com",
              },
              location: {
                label: "Location",
                address: "London, Manchester, Birmingham",
              },
            },
          },
        },
        {
          id: 3,
          name: "Canada",
          slug: "canada",
          icon: "/assets/img/home-2/visa/02.png",
          services: [
            "Student Visa & Admission",
            "Work Permit",
            "Express Entry",
            "Family Sponsorship",
          ],
          detailedView: {
            activeCountry: {
              id: 3,
              name: "Canada",
              title: "COUNTRY CANADA",
              mainImage: "/assets/img/inner-page/country-details/details-1.jpg",
              description:
                "Canada is known for its high quality of life, excellent education system, and welcoming immigration policies...",
              additionalInfo:
                "We specialize in Express Entry, study permits, and work permits for Canada.",
              tagline: "Your pathway to a better life in Canada starts here.",
              visaTypes: [
                {
                  title: "Study & Work",
                  items: [
                    {
                      title: "Study Permit",
                      description: "Study at Canadian institutions",
                    },
                    {
                      title: "Work Permit",
                      description: "Temporary work in Canada",
                    },
                  ],
                },
                {
                  title: "Immigration & Family",
                  items: [
                    {
                      title: "Express Entry",
                      description: "Fast-track permanent residency",
                    },
                    {
                      title: "Family Sponsorship",
                      description: "Bring your family to Canada",
                    },
                  ],
                },
              ],
              visaProcess: {
                title: "Canada Visa Process",
                steps: [
                  {
                    number: "01",
                    title: "Initial Assessment",
                    description:
                      "We assess your eligibility for Canadian programs.",
                  },
                  {
                    number: "02",
                    title: "Documentation",
                    description: "Prepare comprehensive application packages.",
                  },
                  {
                    number: "03",
                    title: "Application",
                    description: "Submit to IRCC (Immigration Canada).",
                  },
                  {
                    number: "04",
                    title: "Medical & Security",
                    description: "Complete medical exams and security checks.",
                  },
                  {
                    number: "05",
                    title: "Approval",
                    description: "Receive your visa and prepare for arrival.",
                  },
                ],
              },
              gallery: [
                "/assets/img/inner-page/country-details/details-2.jpg",
                "/assets/img/inner-page/country-details/details-3.png",
              ],
              visaCategories: {
                title: "Types of Canadian Visas",
                steps: [
                  [
                    "Study Permit",
                    "Work Permit (Open/Closed)",
                    "International Mobility Program",
                  ],
                  [
                    "Express Entry (FSW, CEC, FST)",
                    "Provincial Nominee Program",
                    "Family Sponsorship",
                  ],
                ],
              },
              visaService: {
                title: "Our Canada Visa Services",
                steps: [
                  {
                    number: "01",
                    title: "Free Consultation",
                    description: "Discuss your Canadian immigration goals.",
                  },
                  {
                    number: "02",
                    title: "Eligibility Check",
                    description: "Determine best pathway for you.",
                  },
                  {
                    number: "03",
                    title: "Application Support",
                    description: "Complete assistance with applications.",
                  },
                  {
                    number: "04",
                    title: "Preparation",
                    description: "Prepare for medical exams and interviews.",
                  },
                  {
                    number: "05",
                    title: "Settlement Support",
                    description: "Help with housing and job search.",
                  },
                ],
              },
            },
            relatedCountries: [
              {
                id: 1,
                name: "USA",
                icon: "/assets/img/inner-page/country-details/01.png",
              },
              {
                id: 2,
                name: "Australia",
                icon: "/assets/img/inner-page/country-details/02.png",
              },
            ],
            contactInfo: {
              sectionTitle: "Canada Visa & Immigration",
              helpText: "Ready to Immigrate to Canada?",
              img: "/assets/img/inner-page/country-details/bg.jpg",
              phone: {
                label: "Call Us",
                value: "+1 416 815 7755",
                link: "tel:+14168157755",
              },
              email: {
                label: "Mail Us",
                value: "visa@canada-consultant.com",
                link: "mailto:visa@canada-consultant.com",
              },
              location: {
                label: "Location",
                address: "Toronto, Vancouver, Montreal",
              },
            },
          },
        },
        {
          id: 4,
          name: "Germany",
          slug: "germany",
          icon: "/assets/img/home-2/visa/12.png",
          services: [
            "Student Visa & Admission",
            "Work Visa – H1B",
            "Work permit for Canada",
            "Student Visa for Canada",
          ],
        },
        {
          id: 5,
          name: "Spain",
          slug: "spain",
          icon: "/assets/img/home-2/visa/13.png",
          services: [
            "Student Visa & Admission",
            "Work Visa – H1B",
            "Work permit for Canada",
            "Student Visa for Canada",
          ],
        },
        {
          id: 6,
          name: "South Korea",
          slug: "south-korea",
          icon: "/assets/img/home-2/visa/14.png",
          services: [
            "Student Visa & Admission",
            "Work Visa – H1B",
            "Work permit for Canada",
            "Student Visa for Canada",
          ],
        },
        {
          id: 7,
          name: "Japan",
          slug: "japan",
          icon: "/assets/img/home-2/visa/15.png",
          services: [
            "Student Visa & Admission",
            "Work Visa – H1B",
            "Work permit for Canada",
            "Student Visa for Canada",
          ],
        },
        {
          id: 8,
          name: "Croatia",
          slug: "croatia",
          icon: "/assets/img/home-2/visa/16.png",
          services: [
            "Student Visa & Admission",
            "Work Visa – H1B",
            "Work permit for Canada",
            "Student Visa for Canada",
          ],
        },
        {
          id: 9,
          name: "England",
          slug: "england",
          icon: "/assets/img/home-2/visa/17.png",
          services: [
            "Student Visa & Admission",
            "Work Visa – H1B",
            "Work permit for Canada",
            "Student Visa for Canada",
          ],
        },
        {
          id: 10,
          name: "Indonesia",
          slug: "indonesia",
          icon: "/assets/img/home-2/visa/18.png",
          services: [
            "Student Visa & Admission",
            "Work Visa – H1B",
            "Work permit for Canada",
            "Student Visa for Canada",
          ],
        },
      ],
    },
  };
}