import { getBlog } from "@/content/blogs/blogs";
import { getWebpage } from "@/content/pages/pages";
import { getAlbum } from "@/content/photos/albums";
import { getPhotoFromHash } from "@/content/photos/photos";
import { getProject } from "@/content/projects/projects";

export async function getPage(settings: GlobalSettings, route: string): Promise<PageType | null> {  
    // Blog Index  
    if (regexToRoute({ template: settings.blog.indexRouteTemplate, allowPagination: true }).regex.test(route)) {
        const { regex, keys } = regexToRoute({ template: settings.blog.indexRouteTemplate, allowPagination: true });
        const match = route.match(regex);
        const params: Record<string, string> = {};
        
        if (!match) return null;

        keys.forEach((key, i) => {
            params[key] = match[i + 1];
        });

        return {
            route: route,
            pageType: "BlogIndex",
            page: {
                type: "BlogIndex",
                exists: true,
                pageNumber: params["page"] !== undefined ? Number(params["page"]) : 1
            }
        };
    }
    // Blog Post
    else if (regexToRoute({ template: settings.blog.blogRouteTemplate, allowPagination: false }).regex.test(route)) {
        const { regex, keys } = regexToRoute({ template: settings.blog.blogRouteTemplate, allowPagination: false });
        const match = route.match(regex);
        const params: Record<string, string> = {};

        if (!match) return null;

        keys.forEach((key, i) => {
            params[key] = match[i + 1];
        });
        
        const blog = await getBlog(settings, `/${params["R"]}`);

        return {
            route: route,
            pageType: "BlogPost",
            page: blog
        };
    }
    // Project Index
    else if (regexToRoute({ template: settings.project.indexRouteTemplate, allowPagination: true }).regex.test(route)) {
        const { regex, keys } = regexToRoute({ template: settings.project.indexRouteTemplate, allowPagination: true });
        const match = route.match(regex);
        const params: Record<string, string> = {};
        
        if (!match) return null;

        keys.forEach((key, i) => {
            params[key] = match[i + 1];
        });

        return {
            route: route,
            pageType: "ProjectIndex",
            page: {
                type: "ProjectIndex",
                exists: true,
                pageNumber: params["page"] !== undefined ? Number(params["page"]) : 1
            }
        };
    }
    // Project Post
    else if (regexToRoute({ template: settings.project.projectRouteTemplate, allowPagination: false }).regex.test(route)) {
        const { regex, keys } = regexToRoute({ template: settings.project.projectRouteTemplate, allowPagination: false });
        const match = route.match(regex);
        const params: Record<string, string> = {};
        
        if (!match) return null;

        keys.forEach((key, i) => {
            params[key] = match[i + 1];
        });
        
        const project = await getProject(settings, `/${params["R"]}`);

        return {
            route: route,
            pageType: "ProjectPost",
            page: project
        };
    }
    // Photo Category Index
    else if (regexToRoute({ template: settings.photo.categoryIndex.indexRouteTemplate, allowPagination: false }).regex.test(route)) {
        return {
            route: route,
            pageType: "PhotoCategoryIndex",
            page: {
                type: "PhotoCategoryIndex",
                exists: true
            }
        };
    }
    // Photo Category / Album List
    else if (regexToRoute({ template: settings.photo.category.routeTemplate, allowPagination: true }).regex.test(route)) {
        const { regex, keys } = regexToRoute({ template: settings.photo.category.routeTemplate, allowPagination: true });
        const match = route.match(regex);
        const params: Record<string, string> = {};
        
        if (!match) return null;

        keys.forEach((key, i) => {
            params[key] = match[i + 1];
        });

        return {
            route: route,
            pageType: "PhotoCategory",
            page: {
                type: "PhotoCategory",
                exists: true,
                category: params["category"],
                pageNumber: params["page"] !== undefined ? Number(params["page"]) : 1
            }
        };
    }
    // Photo Album
    else if (regexToRoute({ template: settings.photo.album.routeTemplate, allowPagination: true }).regex.test(route)) {
        const { regex, keys } = regexToRoute({ template: settings.photo.album.routeTemplate, allowPagination: true });
        const match = route.match(regex);
        const params: Record<string, string> = {};
        
        if (!match) return null;

        keys.forEach((key, i) => {
            params[key] = match[i + 1];
        });

        const photoAlbum = await getAlbum(settings, `/${params["R"]}`);
        
        return {
            route: route,
            pageType: "PhotoAlbum",
            page: photoAlbum
        };
    }
    // Photograph
    else if (regexToRoute({ template: settings.photo.photo.routeTemplate, allowPagination: false }).regex.test(route)) {
        const { regex, keys } = regexToRoute({ template: settings.photo.photo.routeTemplate, allowPagination: false });
        const match = route.match(regex);
        const params: Record<string, string> = {};
        
        if (!match) return null;

        keys.forEach((key, i) => {
            params[key] = match[i + 1];
        });

        const photo = await getPhotoFromHash(`/${params["R"]}`, params["H"]);

        if (photo === null) {}

        return {
            route: route,
            pageType: "Photo",
            page: {
                type: "PhotoPage",
                exists: true,
                
                id: photo!.id,
                photo: photo!.photo,
                text: photo!.text
            }
        };
    }
    // Regular webpage
    else if (regexToRoute({ template: "/", allowPagination: false }).regex.test(route) || 
        regexToRoute({ template: "/%R", allowPagination: false }).regex.test(route)) {
        const webpageContent = await getWebpage(route);

        if (webpageContent === null || !webpageContent.exists) {
            return {
                route: route,
                pageType: "Webpage",
                page: {
                    type: "Webpage",
                    exists: false
                }
            }
        }
        
        return {
            route: route,
            pageType: "Webpage",
            page: {
                type: "Webpage",
                exists: true,
                id: webpageContent.id,
                lastModified: webpageContent.lastModified,
                url: webpageContent.url,
                searchEngine: webpageContent.searchEngine,
                components: webpageContent.components
            }
        };
    }
    else {
        return null;
    }
}

function regexToRoute(template: PageRegexMatchProps) {
    const keys: string[] = [];

    let pattern = template.template
        .replaceAll("%Y", () => { keys.push("Y"); return "(\\d{4})"; })
        .replaceAll("%M", () => { keys.push("M"); return "(\\d{2})"; })
        .replaceAll("%D", () => { keys.push("D"); return "(\\d{2})"; })
        .replaceAll("%R", () => { keys.push("R"); return "([^/]+)"; })
        .replaceAll("%C", () => { keys.push("C"); return "([^/]+)"; })
        .replaceAll("%H", () => { keys.push("H"); return "([^/]+)"; })
        .replace(/\/+/g, "/");

    if (template.allowPagination) {
        keys.push("page");
        pattern += "(?:\\/(\\d+))?";
    }

    return {
        regex: new RegExp(`^${pattern}$`),
        keys
    };
}