import semver from "semver";
import { warn } from "luban-cli-shared-utils";

import { tryGetNewerRange } from "./tryGetNewerRange";
import { StringDictionary } from "../types";

const extractSemver = function(r: string): string {
  return r.replace(/^.+#semver:/, "");
};
const injectSemver = function(r: string, v: string): string {
  return semver.validRange(r) ? v : r.replace(/#semver:.+$/, `#semver:${v}`);
};

export const resolveDeps = function(
  generatorId: string,
  to: StringDictionary<any>,
  from: StringDictionary<any>,
  sources: StringDictionary<any>,
  forceNewVersion?: boolean,
): StringDictionary<any> {
  const res = Object.assign({}, to);
  for (const name in from) {
    const r1 = to[name];
    const r2 = from[name];
    const sourceGeneratorId = sources[name];
    const isValidURI = r2.match(/^(?:file|git|git\+ssh|git\+http|git\+https|git\+file|https?):/) != null;
    const isValidGitHub = r2.match(/^[^/]+\/[^/]+/) != null;

    // if they are the same, do nothing. Helps when non semver type deps are used
    if (r1 === r2) continue;

    if (!isValidGitHub && !isValidURI && !semver.validRange(r2)) {
      warn(`invalid version range for dependency "${name}":\n\n` + `- ${r2} injected by generator "${generatorId}"`);
      continue;
    }

    if (!r1) {
      res[name] = r2;
      sources[name] = generatorId;
    } else {
      const r1semver = extractSemver(r1);
      const r2semver = extractSemver(r2);
      const r = tryGetNewerRange(r1semver, r2semver);
      const didGetNewer = !!r;
      // if failed to infer newer version, use existing one because it's likely
      // built-in
      res[name] = didGetNewer ? injectSemver(r2, r || "") : r1;
      // if changed, update source
      if (res[name] === r2) {
        sources[name] = generatorId;
      }
      // warn incompatible version requirements
      if (
        !forceNewVersion &&
        (!semver.validRange(r1semver) || !semver.validRange(r2semver) || !semver.intersects(r1semver, r2semver))
      ) {
        warn(
          `conflicting versions for project dependency "${name}":\n\n` +
            `- ${r1} injected by generator "${sourceGeneratorId}"\n` +
            `- ${r2} injected by generator "${generatorId}"\n\n` +
            `Using ${didGetNewer ? `newer ` : ``}version (${res[name]}), but this may cause build errors.`,
        );
      }
    }
  }
  return res;
};