import * as log from "loglevel";

import { defineStore } from "pinia";

import { itPost } from "@/fetchHelpers";
import type { Circle } from "@/services/circle";
import { useLearningPathStore } from "@/stores/learningPath";
import type {
  CourseCompletionStatus,
  LearningContent,
  LearningUnit,
  LearningUnitPerformanceCriteria,
} from "@/types";

export type CircleStoreState = {
  circle: Circle | undefined;
  page: "INDEX" | "OVERVIEW";
};

function createLearningUnitHash(learningUnit: LearningUnit | undefined) {
  const luSlug = learningUnit?.slug;
  const circleSlug = learningUnit?.parentCircle?.slug;
  if (luSlug && circleSlug) {
    return "#" + luSlug.replace(`${circleSlug}-`, "");
  }

  return "";
}

export const useCircleStore = defineStore({
  id: "circle",
  state: () => {
    return {
      circle: undefined,
      page: "INDEX",
    } as CircleStoreState;
  },
  getters: {},
  actions: {
    async loadCircle(learningPathSlug: string, circleSlug: string): Promise<Circle> {
      this.circle = undefined;
      const learningPathStore = useLearningPathStore();
      await learningPathStore.loadLearningPath(learningPathSlug);
      if (learningPathStore.learningPath) {
        this.circle = learningPathStore.learningPath.circles.find((circle) => {
          return circle.slug.endsWith(circleSlug);
        });
      }

      if (!this.circle) {
        throw `No circle found with slug: ${circleSlug}`;
      }

      return this.circle;
    },
    async loadLearningContent(
      learningPathSlug: string,
      circleSlug: string,
      learningContentSlug: string
    ) {
      const circle = await this.loadCircle(learningPathSlug, circleSlug);
      const result = circle.flatLearningContents.find((learningContent) => {
        return learningContent.slug.endsWith(learningContentSlug);
      });

      if (!result) {
        throw `No learning content found with slug: ${learningContentSlug}`;
      }

      return result;
    },
    async loadSelfEvaluation(
      learningPathSlug: string,
      circleSlug: string,
      learningUnitSlug: string
    ) {
      const circle = await this.loadCircle(learningPathSlug, circleSlug);
      const learningUnit = circle.flatLearningUnits.find((child) => {
        return child.slug.endsWith(learningUnitSlug);
      });

      if (!learningUnit) {
        throw `No self evaluation found with slug: ${learningUnitSlug}`;
      }

      return learningUnit;
    },
    async markCompletion(
      page: LearningContent | LearningUnitPerformanceCriteria,
      completion_status: CourseCompletionStatus = "success"
    ) {
      try {
        page.completion_status = completion_status;
        const completionData = await itPost("/api/course/completion/mark/", {
          page_key: page.translation_key,
          completion_status: page.completion_status,
        });
        if (this.circle) {
          this.circle.parseCompletionData(completionData);
        }
      } catch (error) {
        log.error(error);
        return error;
      }
    },
    openLearningContent(learningContent: LearningContent) {
      this.router.push({
        path: learningContent.frontend_url,
      });
    },
    closeLearningContent(learningContent: LearningContent) {
      this.router.push({
        path: `${this.circle?.frontend_url}`,
        hash: createLearningUnitHash(learningContent.parentLearningUnit),
      });
    },
    openSelfEvaluation(learningUnit: LearningUnit) {
      this.router.push({
        path: learningUnit.frontend_url,
      });
    },
    closeSelfEvaluation(learningUnit: LearningUnit) {
      this.router.push({
        path: `${this.circle?.frontend_url}`,
        hash: createLearningUnitHash(learningUnit),
      });
    },
    calcSelfEvaluationStatus(learningUnit: LearningUnit) {
      if (learningUnit.children.length > 0) {
        if (learningUnit.children.every((q) => q.completion_status === "success")) {
          return true;
        }
        if (learningUnit.children.some((q) => q.completion_status === "fail")) {
          return false;
        }
      }
      return undefined;
    },
    continueFromLearningContent(currentLearningContent: LearningContent) {
      if (currentLearningContent) {
        this.markCompletion(currentLearningContent, "success");

        const nextLearningContent = currentLearningContent.nextLearningContent;
        const currentParent = currentLearningContent.parentLearningUnit;
        const nextParent = nextLearningContent?.parentLearningUnit;

        if (
          currentParent &&
          currentParent.id &&
          currentParent.id !== nextParent?.id &&
          currentParent.children.length > 0
        ) {
          // go to self evaluation
          this.openSelfEvaluation(currentParent);
        } else if (currentLearningContent.nextLearningContent) {
          if (
            currentLearningContent.parentLearningUnit &&
            currentLearningContent.parentLearningUnit.id ===
              nextLearningContent?.parentLearningUnit?.id
          ) {
            this.openLearningContent(currentLearningContent.nextLearningContent);
          } else {
            this.closeLearningContent(currentLearningContent);
          }
        } else {
          this.closeLearningContent(currentLearningContent);
        }
      } else {
        log.error("currentLearningContent is undefined");
      }
    },
    continueFromSelfEvaluation(learningUnit: LearningUnit) {
      this.closeSelfEvaluation(learningUnit);
    },
  },
});