// routes/api/brain/progress.ts
// API endpoint for Brain study progress with mode progression

import { define, State } from "../../../utils.ts";
import { SessionCookie } from "../../auth/callback.ts";
import { brainDataClient } from "../../../utils/BrainDataClient.ts";

export const handler = define.handlers({
  // GET: Fetch user's brain progress stats
  async GET(ctx) {
    const state = ctx.state as State;
    const stateData: SessionCookie = state.data ?? {
      started_on: 0,
      user_name: "",
      user_id: "",
      role: "",
      user_encrypted: false,
    };

    if (!state.stateId || !stateData.user_id) {
      return new Response(
        JSON.stringify({ error: "Unauthorized" }),
        { status: 401, headers: { "Content-Type": "application/json" } },
      );
    }

    try {
      const stats = await brainDataClient.getStats(stateData.user_id);
      const dueCount = await brainDataClient.getDueCount(stateData.user_id);

      return new Response(
        JSON.stringify({
          success: true,
          stats,
          dueCount,
        }),
        { status: 200, headers: { "Content-Type": "application/json" } },
      );
    } catch (error) {
      console.error("Error fetching brain progress:", error);
      return new Response(
        JSON.stringify({ error: "Failed to fetch progress" }),
        { status: 500, headers: { "Content-Type": "application/json" } },
      );
    }
  },

  // POST: Record answer result with mode progression
  async POST(ctx) {
    const state = ctx.state as State;
    const stateData: SessionCookie = state.data ?? {
      started_on: 0,
      user_name: "",
      user_id: "",
      role: "",
      user_encrypted: false,
    };

    if (!state.stateId || !stateData.user_id) {
      return new Response(
        JSON.stringify({ error: "Unauthorized" }),
        { status: 401, headers: { "Content-Type": "application/json" } },
      );
    }

    try {
      const body = await ctx.req.json();
      const { questionId, quizId, wasCorrectFirstTry } = body;

      // Mode is no longer required - it's tracked per-card by the backend
      if (!questionId || !quizId || typeof wasCorrectFirstTry !== "boolean") {
        return new Response(
          JSON.stringify({
            error:
              "Missing required fields: questionId, quizId, wasCorrectFirstTry",
          }),
          { status: 400, headers: { "Content-Type": "application/json" } },
        );
      }

      const progress = await brainDataClient.recordAnswer(
        stateData.user_id,
        questionId,
        quizId,
        wasCorrectFirstTry,
      );

      return new Response(
        JSON.stringify({
          success: true,
          progress,
          // Include mode advancement info for UI feedback
          modeAdvanced: wasCorrectFirstTry && progress.mode_index > 0,
          isReviewOnly: progress.is_review_only,
        }),
        { status: 200, headers: { "Content-Type": "application/json" } },
      );
    } catch (error) {
      console.error("Error recording brain progress:", error);
      return new Response(
        JSON.stringify({ error: "Failed to record progress" }),
        { status: 500, headers: { "Content-Type": "application/json" } },
      );
    }
  },

  // DELETE: Reset progress
  async DELETE(ctx) {
    const state = ctx.state as State;
    const stateData: SessionCookie = state.data ?? {
      started_on: 0,
      user_name: "",
      user_id: "",
      role: "",
      user_encrypted: false,
    };

    if (!state.stateId || !stateData.user_id) {
      return new Response(
        JSON.stringify({ error: "Unauthorized" }),
        { status: 401, headers: { "Content-Type": "application/json" } },
      );
    }

    const url = new URL(ctx.req.url);
    const questionId = url.searchParams.get("questionId");
    const quizId = url.searchParams.get("quizId");
    const resetAll = url.searchParams.get("all") === "true";

    try {
      if (resetAll) {
        await brainDataClient.resetAllProgress(stateData.user_id);
      } else if (quizId) {
        await brainDataClient.resetQuizProgress(stateData.user_id, quizId);
      } else if (questionId) {
        // Mode is no longer needed - progress is per-question now
        await brainDataClient.resetQuestionProgress(
          stateData.user_id,
          questionId,
        );
      } else {
        return new Response(
          JSON.stringify({ error: "Missing reset parameters" }),
          { status: 400, headers: { "Content-Type": "application/json" } },
        );
      }

      return new Response(
        JSON.stringify({ success: true }),
        { status: 200, headers: { "Content-Type": "application/json" } },
      );
    } catch (error) {
      console.error("Error resetting brain progress:", error);
      return new Response(
        JSON.stringify({ error: "Failed to reset progress" }),
        { status: 500, headers: { "Content-Type": "application/json" } },
      );
    }
  },
});