"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 { apiClient } from "@/services/api-client";
import { loadSkillCategories, loadTeams } from "@/lib/data-loader";
import { AuthService } from "@/lib/auth-utils";

// Fonction pour migrer une évaluation existante avec de nouvelles catégories
function migrateEvaluation(
  evaluation: UserEvaluation,
  allCategories: SkillCategory[]
): UserEvaluation {
  const existingCategoryNames = evaluation.evaluations.map((e) => e.category);
  const missingCategories = allCategories.filter(
    (cat) => !existingCategoryNames.includes(cat.category)
  );

  if (missingCategories.length === 0) {
    return evaluation; // Pas de migration nécessaire
  }

  console.log(
    "🔄 Migrating evaluation with new categories:",
    missingCategories.map((c) => c.category)
  );

  const newCategoryEvaluations: CategoryEvaluation[] = missingCategories.map(
    (category) => ({
      category: category.category,
      skills: [],
      selectedSkillIds: [],
    })
  );

  return {
    ...evaluation,
    evaluations: [...evaluation.evaluations, ...newCategoryEvaluations],
    lastUpdated: new Date().toISOString(),
  };
}

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 user profile from cookie and then load evaluation from API
        try {
          const profile = await AuthService.getCurrentUser();
          if (profile) {
            const saved = await loadUserEvaluation(profile);
            if (saved) {
              // Migrate evaluation to include new categories if needed
              const migratedEvaluation = migrateEvaluation(saved, categories);
              setUserEvaluation(migratedEvaluation);
              if (migratedEvaluation !== saved) {
                await saveUserEvaluation(migratedEvaluation); // Save the migrated version
              }
            }
          }
        } catch (profileError) {
          console.error("Failed to load user profile:", profileError);
        }
      } catch (error) {
        console.error("Failed to initialize data:", error);
      } finally {
        setLoading(false);
      }
    }

    initializeData();
  }, []);

  const loadEvaluationForProfile = async (profile: UserProfile) => {
    try {
      setLoading(true);
      const saved = await loadUserEvaluation(profile);
      if (saved) {
        // Migrate evaluation to include new categories if needed
        const migratedEvaluation = migrateEvaluation(saved, skillCategories);
        setUserEvaluation(migratedEvaluation);
        if (migratedEvaluation !== saved) {
          await saveUserEvaluation(migratedEvaluation); // Save the migrated version
        }
      } else {
        // Create new evaluation
        const evaluations = createEmptyEvaluation(skillCategories);
        const newEvaluation: UserEvaluation = {
          profile,
          evaluations,
          lastUpdated: new Date().toISOString(),
        };
        setUserEvaluation(newEvaluation);
      }
    } catch (error) {
      console.error("Failed to load evaluation for profile:", error);
    } finally {
      setLoading(false);
    }
  };

  const reloadSkillCategories = async () => {
    try {
      const categories = await loadSkillCategories();
      setSkillCategories(categories);

      // Si on a une évaluation en cours, la migrer avec les nouvelles catégories
      if (userEvaluation) {
        const migratedEvaluation = migrateEvaluation(
          userEvaluation,
          categories
        );
        if (migratedEvaluation !== userEvaluation) {
          setUserEvaluation(migratedEvaluation);
          await saveUserEvaluation(migratedEvaluation);
        }
      }
    } catch (error) {
      console.error("Failed to reload skill categories:", error);
    }
  };

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

    // Authenticate user and create cookie
    await AuthService.login(profile);

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

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

    try {
      // Optimistic update
      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);

      // Update via API
      await apiClient.updateSkillLevel(
        userEvaluation.profile,
        category,
        skillId,
        level
      );
    } catch (error) {
      console.error("Failed to update skill level:", error);
      // Revert optimistic update if needed
    }
  };

  const updateSkillMentorStatus = async (
    category: string,
    skillId: string,
    canMentor: boolean
  ) => {
    if (!userEvaluation) return;

    try {
      const updatedEvaluations = userEvaluation.evaluations.map((catEval) => {
        if (catEval.category === category) {
          const updatedSkills = catEval.skills.map((skill) =>
            skill.skillId === skillId ? { ...skill, canMentor } : skill
          );

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

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

      setUserEvaluation(newEvaluation);
      await apiClient.updateSkillMentorStatus(
        userEvaluation.profile,
        category,
        skillId,
        canMentor
      );
    } catch (error) {
      console.error("Failed to update skill mentor status:", error);
    }
  };

  const updateSkillLearningStatus = async (
    category: string,
    skillId: string,
    wantsToLearn: boolean
  ) => {
    if (!userEvaluation) return;

    try {
      const updatedEvaluations = userEvaluation.evaluations.map((catEval) => {
        if (catEval.category === category) {
          const updatedSkills = catEval.skills.map((skill) =>
            skill.skillId === skillId ? { ...skill, wantsToLearn } : skill
          );

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

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

      setUserEvaluation(newEvaluation);
      await apiClient.updateSkillLearningStatus(
        userEvaluation.profile,
        category,
        skillId,
        wantsToLearn
      );
    } catch (error) {
      console.error("Failed to update skill learning status:", error);
    }
  };

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

    // Sauvegarder l'état actuel pour le rollback
    const previousEvaluation = userEvaluation;

    try {
      // Optimistic UI update - mettre à jour immédiatement l'interface
      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, canMentor: false, wantsToLearn: false },
              ],
            };
          }
        }
        return catEval;
      });

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

      setUserEvaluation(newEvaluation);

      // Appel API en arrière-plan
      await apiClient.addSkillToEvaluation(
        userEvaluation.profile,
        category,
        skillId
      );
    } catch (error) {
      console.error("Failed to add skill to evaluation:", error);
      // Rollback optimiste en cas d'erreur
      setUserEvaluation(previousEvaluation);
      // Optionnel: afficher une notification d'erreur à l'utilisateur
    }
  };

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

    // Sauvegarder l'état actuel pour le rollback
    const previousEvaluation = userEvaluation;

    try {
      // Optimistic UI update - mettre à jour immédiatement l'interface
      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);

      // Appel API en arrière-plan
      await apiClient.removeSkillFromEvaluation(
        userEvaluation.profile,
        category,
        skillId
      );
    } catch (error) {
      console.error("Failed to remove skill from evaluation:", error);
      // Rollback optimiste en cas d'erreur
      setUserEvaluation(previousEvaluation);
      // Optionnel: afficher une notification d'erreur à l'utilisateur
    }
  };

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

    // Authenticate user and create cookie
    await AuthService.login(profile);

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

  const clearUserProfile = async () => {
    try {
      await AuthService.logout();
      setUserEvaluation(null);
    } catch (error) {
      console.error("Failed to logout:", error);
      setUserEvaluation(null);
    }
  };

  return {
    userEvaluation,
    skillCategories,
    teams,
    loading,
    loadEvaluationForProfile,
    updateProfile,
    updateSkillLevel,
    updateSkillMentorStatus,
    updateSkillLearningStatus,
    addSkillToEvaluation,
    removeSkillFromEvaluation,
    initializeEmptyEvaluation,
    clearUserProfile,
    reloadSkillCategories,
  };
}