"use client";

import { useState, useEffect } from "react";
import {
  UserEvaluation,
  SkillCategory,
  Team,
  CategoryEvaluation,
  UserProfile,
  SkillLevel,
} from "@/lib/types";
import {
  loadUserEvaluation,
  saveUserEvaluation,
  createEmptyEvaluation,
} from "@/lib/evaluation-utils";
import { loadSkillCategories, loadTeams } from "@/lib/data-loader";

export function useEvaluation() {
  const [userEvaluation, setUserEvaluation] = useState<UserEvaluation | null>(
    null
  );
  const [skillCategories, setSkillCategories] = useState<SkillCategory[]>([]);
  const [teams, setTeams] = useState<Team[]>([]);
  const [loading, setLoading] = useState(true);

  // Load initial data
  useEffect(() => {
    async function initializeData() {
      try {
        const [categories, teamsData] = await Promise.all([
          loadSkillCategories(),
          loadTeams(),
        ]);

        setSkillCategories(categories);
        setTeams(teamsData);

        // Try to load existing evaluation
        const saved = loadUserEvaluation();
        if (saved) {
          setUserEvaluation(saved);
        }
      } catch (error) {
        console.error("Failed to initialize data:", error);
      } finally {
        setLoading(false);
      }
    }

    initializeData();
  }, []);

  const updateProfile = (profile: UserProfile) => {
    const evaluations =
      userEvaluation?.evaluations || createEmptyEvaluation(skillCategories);
    const newEvaluation: UserEvaluation = {
      profile,
      evaluations,
      lastUpdated: new Date().toISOString(),
    };

    setUserEvaluation(newEvaluation);
    saveUserEvaluation(newEvaluation);
  };

  const updateSkillLevel = (
    category: string,
    skillId: string,
    level: SkillLevel
  ) => {
    if (!userEvaluation) return;

    const updatedEvaluations = userEvaluation.evaluations.map((catEval) => {
      if (catEval.category === category) {
        const existingSkill = catEval.skills.find((s) => s.skillId === skillId);
        const updatedSkills = existingSkill
          ? catEval.skills.map((skill) =>
              skill.skillId === skillId ? { ...skill, level } : skill
            )
          : [...catEval.skills, { skillId, level }];

        return {
          ...catEval,
          skills: updatedSkills,
        };
      }
      return catEval;
    });

    const newEvaluation: UserEvaluation = {
      ...userEvaluation,
      evaluations: updatedEvaluations,
      lastUpdated: new Date().toISOString(),
    };

    setUserEvaluation(newEvaluation);
    saveUserEvaluation(newEvaluation);
  };

  const addSkillToEvaluation = (category: string, skillId: string) => {
    if (!userEvaluation) return;

    const updatedEvaluations = userEvaluation.evaluations.map((catEval) => {
      if (catEval.category === category) {
        if (!catEval.selectedSkillIds.includes(skillId)) {
          return {
            ...catEval,
            selectedSkillIds: [...catEval.selectedSkillIds, skillId],
            skills: [...catEval.skills, { skillId, level: null }],
          };
        }
      }
      return catEval;
    });

    const newEvaluation: UserEvaluation = {
      ...userEvaluation,
      evaluations: updatedEvaluations,
      lastUpdated: new Date().toISOString(),
    };

    setUserEvaluation(newEvaluation);
    saveUserEvaluation(newEvaluation);
  };

  const removeSkillFromEvaluation = (category: string, skillId: string) => {
    if (!userEvaluation) return;

    const updatedEvaluations = userEvaluation.evaluations.map((catEval) => {
      if (catEval.category === category) {
        return {
          ...catEval,
          selectedSkillIds: catEval.selectedSkillIds.filter(
            (id) => id !== skillId
          ),
          skills: catEval.skills.filter((skill) => skill.skillId !== skillId),
        };
      }
      return catEval;
    });

    const newEvaluation: UserEvaluation = {
      ...userEvaluation,
      evaluations: updatedEvaluations,
      lastUpdated: new Date().toISOString(),
    };

    setUserEvaluation(newEvaluation);
    saveUserEvaluation(newEvaluation);
  };

  const initializeEmptyEvaluation = (profile: UserProfile) => {
    const evaluations = createEmptyEvaluation(skillCategories);
    const newEvaluation: UserEvaluation = {
      profile,
      evaluations,
      lastUpdated: new Date().toISOString(),
    };

    setUserEvaluation(newEvaluation);
    saveUserEvaluation(newEvaluation);
  };

  return {
    userEvaluation,
    skillCategories,
    teams,
    loading,
    updateProfile,
    updateSkillLevel,
    addSkillToEvaluation,
    removeSkillFromEvaluation,
    initializeEmptyEvaluation,
  };
}