import { exportCustomWidgetDefinition } from "@homarr/custom-widgets/core";
import { CUSTOM_WIDGET_SCHEMA, customWidgetImportSchema } from "@homarr/custom-widgets/core";
import { z } from "zod/v4";

export const HOMARR_WEBSITE_URL = "https://homarr.dev";
export const WORKSHOP_API_URL = HOMARR_WEBSITE_URL;
export const WORKSHOP_WEB_URL = `${HOMARR_WEBSITE_URL}/workshop`;
export const WORKSHOP_CSS_SCHEMA = "homarr-custom-css-v1";
export const WORKSHOP_SCHEMA_BY_TYPE = {
  customWidget: CUSTOM_WIDGET_SCHEMA,
  customCss: WORKSHOP_CSS_SCHEMA,
} as const;
export const MAX_WORKSHOP_CSS_LENGTH = 16_384;
export const MAX_WORKSHOP_CONTENT_LENGTH = 1_000_000;
export const MAX_WORKSHOP_SCREENSHOTS = 5;
export const MAX_WORKSHOP_SCREENSHOT_BYTES = 5 * 1024 * 1024;
export const WORKSHOP_REQUEST_TIMEOUT_MS = 8_000;
export const WORKSHOP_SCREENSHOT_MIME_TYPES = ["image/png", "image/jpeg", "image/webp"] as const;

export const githubProfileUrl = (username: string) =>
  username ? `https://github.com/${encodeURIComponent(username)}` : "";
export const githubAvatarUrl = (username: string) =>
  username ? `https://github.com/${encodeURIComponent(username)}.png` : "";

export interface HomarrUrlConfig {
  homarrWebsiteUrl: string;
  workshopApiUrl: string;
  workshopWebUrl: string;
}

export interface HomarrUrlConfigInput {
  homarrWebsiteUrl?: string;
  workshopApiUrl?: string;
  workshopWebUrl?: string;
}

export function normalizeHttpUrl(value: string, variableName: string): string {
  if (value !== value.trim() || hasAsciiControl(value)) {
    throw new Error(`${variableName} must not include surrounding whitespace or control characters`);
  }

  let url: URL;
  try {
    url = new URL(value);
  } catch {
    throw new Error(`${variableName} must be a valid absolute HTTP(S) URL`);
  }

  if (url.protocol !== "http:" && url.protocol !== "https:") {
    throw new Error(`${variableName} must use HTTP or HTTPS`);
  }
  if (url.username || url.password) {
    throw new Error(`${variableName} must not include credentials`);
  }
  if (url.search || url.hash) {
    throw new Error(`${variableName} must not include a query string or fragment`);
  }

  return url.toString().replace(/\/+$/u, "");
}

function hasAsciiControl(value: string): boolean {
  return [...value].some((character) => {
    const code = character.codePointAt(0) ?? 0;
    return code <= 31 || code === 127;
  });
}

export function resolveHomarrUrlConfig(input: HomarrUrlConfigInput = {}): HomarrUrlConfig {
  const homarrWebsiteUrl = normalizeHttpUrl(input.homarrWebsiteUrl ?? HOMARR_WEBSITE_URL, "HOMARR_WEBSITE_URL");
  const workshopApiUrl = normalizeHttpUrl(input.workshopApiUrl ?? homarrWebsiteUrl, "WORKSHOP_API_URL");
  const workshopWebUrl = normalizeHttpUrl(input.workshopWebUrl ?? `${homarrWebsiteUrl}/workshop`, "WORKSHOP_WEB_URL");

  return { homarrWebsiteUrl, workshopApiUrl, workshopWebUrl };
}

export const workshopReportCategorySchema = z.enum([
  "outdated",
  "malicious",
  "spam",
  "copyright",
  "inappropriate",
  "other",
]);
export const workshopSubmissionTypeSchema = z.enum(["customWidget", "customCss"]);
export type WorkshopSubmissionType = z.infer<typeof workshopSubmissionTypeSchema>;

const workshopFileListSchema = z
  .preprocess((value) => {
    if (typeof value !== "string") return value;
    try {
      return JSON.parse(value) as unknown;
    } catch {
      return [];
    }
  }, z.array(z.string()))
  .default([]);

export const workshopUserSchema = z.object({
  id: z.string(),
  name: z.string().default(""),
  isAdmin: z.boolean().default(false),
});
export type WorkshopUser = z.infer<typeof workshopUserSchema>;

export const workshopAssistantUsageSchema = z.object({
  limit: z.number().int().nonnegative(),
  used: z.number().int().nonnegative(),
  remaining: z.number().int().nonnegative(),
  resetsAt: z.iso.datetime({ offset: true }),
});
export type WorkshopAssistantUsage = z.infer<typeof workshopAssistantUsageSchema>;

const normalizeWorkshopSubmissionRecord = (value: unknown) => {
  if (typeof value !== "object" || value === null || Array.isArray(value)) return value;
  const record = value as Record<string, unknown>;
  if (record.type === "customWidget" || record.type === "customCss") return value;
  if (record.widgetSchema === WORKSHOP_CSS_SCHEMA) return { ...record, type: "customCss" };
  if (typeof record.widgetSchema === "string" && record.widgetSchema.startsWith("homarr-custom-widget-"))
    return { ...record, type: "customWidget" };
  return value;
};

const workshopSubmissionBaseObjectSchema = z.object({
  id: z.string(),
  type: workshopSubmissionTypeSchema,
  title: z.string(),
  description: z.string().default(""),
  widgetSchema: z.string(),
  screenshots: workshopFileListSchema,
  author: z.string(),
  authorName: z.string().default(""),
  score: z.number().int().default(0),
  upvotes: z.number().int().default(0),
  downvotes: z.number().int().default(0),
  commentCount: z.number().int().default(0),
  reportCount: z.number().int().default(0),
  revision: z.number().int().positive().default(1),
  changelog: z.string().default(""),
  outdated: z.boolean().default(false),
  created: z.string(),
  updated: z.string(),
});

export const workshopSubmissionSummarySchema = z.preprocess(
  normalizeWorkshopSubmissionRecord,
  workshopSubmissionBaseObjectSchema,
);
export type WorkshopSubmissionSummary = z.infer<typeof workshopSubmissionSummarySchema>;
export const workshopSubmissionDetailSchema = z.preprocess(
  normalizeWorkshopSubmissionRecord,
  workshopSubmissionBaseObjectSchema.extend({ content: z.string() }),
);
export type WorkshopSubmissionDetail = z.infer<typeof workshopSubmissionDetailSchema>;

export const workshopSubmissionInputSchema = z
  .object({
    type: workshopSubmissionTypeSchema,
    title: z.string().trim().min(3).max(100),
    description: z.string().trim().max(2_000).default(""),
    content: z.string().min(1).max(MAX_WORKSHOP_CONTENT_LENGTH),
    changelog: z.string().trim().max(2_000).default(""),
    outdated: z.boolean().default(false),
  })
  .superRefine((input, context) => {
    const result = validateWorkshopContent(input.type, input.content);
    if (!result.success) context.addIssue({ code: "custom", path: ["content"], message: result.error });
  })
  .transform((input) => ({ ...input, content: formatWorkshopContent(input.type, input.content) }));
export type WorkshopSubmissionInput = z.input<typeof workshopSubmissionInputSchema>;

export const workshopScreenshotsSchema = z
  .array(
    z.object({
      size: z.number().max(MAX_WORKSHOP_SCREENSHOT_BYTES),
      type: z.enum(WORKSHOP_SCREENSHOT_MIME_TYPES),
    }),
  )
  .max(MAX_WORKSHOP_SCREENSHOTS);

export const workshopVoteSchema = z.object({
  id: z.string(),
  submission: z.string(),
  user: z.string(),
  value: z.union([z.literal(1), z.literal(-1)]),
});
export type WorkshopVote = z.infer<typeof workshopVoteSchema>;

export const workshopReportSchema = z.object({
  id: z.string(),
  submission: z.string(),
  reporter: z.string(),
  reporterName: z.string().default(""),
  submissionTitle: z.string().default("Deleted submission"),
  category: workshopReportCategorySchema,
  explanation: z.string(),
  status: z.enum(["open", "dismissed"]).default("open"),
  created: z.string(),
  updated: z.string(),
});
export type WorkshopReport = z.infer<typeof workshopReportSchema>;

export const workshopReportSummarySchema = z.object({
  id: z.string(),
  submission: z.string(),
  category: workshopReportCategorySchema,
  explanation: z.string(),
  created: z.string(),
});
export type WorkshopReportSummary = z.infer<typeof workshopReportSummarySchema>;

export const workshopCommentSchema = z.object({
  id: z.string(),
  submission: z.string(),
  author: z.string(),
  content: z.string().min(1).max(2_000),
  created: z.string(),
  updated: z.string(),
  authorName: z.string().default(""),
});
export type WorkshopComment = z.infer<typeof workshopCommentSchema>;

export type WorkshopWidgetValidationResult =
  | { success: true; data: z.infer<typeof customWidgetImportSchema> }
  | { success: false; error: string };
export type WorkshopValidationResult =
  | { success: true; data: z.infer<typeof customWidgetImportSchema> | string }
  | { success: false; error: string };

export function validateWorkshopContent(type: WorkshopSubmissionType, content: string): WorkshopValidationResult {
  if (type === "customCss") {
    if (!content.trim()) return { success: false, error: "CSS cannot be empty" };
    if (content.length > MAX_WORKSHOP_CSS_LENGTH)
      return { success: false, error: `CSS must be at most ${MAX_WORKSHOP_CSS_LENGTH} characters` };
    return { success: true, data: content };
  }

  return validateWorkshopWidget(content);
}

export function formatWorkshopContent(type: WorkshopSubmissionType, content: string): string {
  if (type !== "customWidget") return content;
  const validation = validateWorkshopWidget(content);
  if (!validation.success) return content;
  return JSON.stringify(validation.data, null, 2);
}

export function validateWorkshopWidget(content: string): WorkshopWidgetValidationResult {
  try {
    const parsed: unknown = JSON.parse(content);
    const result = customWidgetImportSchema.safeParse(parsed);
    if (!result.success) {
      const error = result.error.issues
        .slice(0, 5)
        .map((issue) => `${issue.path.join(".") || "widget"}: ${issue.message}`)
        .join("\n");
      return { success: false, error: error || "Invalid widget" };
    }
    return { success: true, data: exportCustomWidgetDefinition(result.data) };
  } catch {
    return { success: false, error: "Widget content is not valid JSON" };
  }
}

export function workshopExportFilename(title: string, type: WorkshopSubmissionType = "customWidget") {
  const safe =
    title
      .trim()
      .toLowerCase()
      .replaceAll(/[^a-z0-9]+/g, "-")
      .replaceAll(/^-|-$/g, "") || "homarr-widget";
  return `${safe}.${type === "customCss" ? "css" : "json"}`;
}