//
//  GuidedReflection.swift
//  Reflect
//
//  Codable model for guided reflection responses, stored as JSON in MoodEntryModel.
//

import Foundation

// MARK: - Mood Category

enum MoodCategory: String, Codable {
    case positive  // great, good → 3 questions (Behavioral Activation)
    case neutral   // average → 4 questions (ACT Cognitive Defusion)
    case negative  // bad, horrible → 4 questions (CBT Thought Record)

    init(from mood: Mood) {
        switch mood {
        case .great, .good: self = .positive
        case .average: self = .neutral
        case .horrible, .bad: self = .negative
        default: self = .neutral
        }
    }

    var questionCount: Int {
        switch self {
        case .positive: return 3
        case .neutral, .negative: return 4
        }
    }

    /// The therapeutic technique name for display purposes.
    var techniqueName: String {
        switch self {
        case .positive: return "Behavioral Activation"
        case .neutral: return "Acceptance & Commitment Therapy"
        case .negative: return "Cognitive Behavioral Therapy"
        }
    }

    /// Short CBT step labels shown above each question.
    var stepLabels: [String] {
        switch self {
        case .negative:
            return [
                String(localized: "Situation"),
                String(localized: "Automatic Thought"),
                String(localized: "Perspective Check"),
                String(localized: "Reframe"),
            ]
        case .neutral:
            return [
                String(localized: "Awareness"),
                String(localized: "Thought"),
                String(localized: "Defusion"),
                String(localized: "Values"),
            ]
        case .positive:
            return [
                String(localized: "Activity"),
                String(localized: "Awareness"),
                String(localized: "Planning"),
            ]
        }
    }
}

// MARK: - Question Chips

struct QuestionChips {
    let topRow: [String]
    let expanded: [String]

    var hasExpanded: Bool { !expanded.isEmpty }

    static func chips(for category: MoodCategory, questionIndex: Int) -> QuestionChips? {
        switch (category, questionIndex) {

        // MARK: Positive (Great/Good) — Behavioral Activation

        // Q1: "What did you do today…?" — no chips (situational)
        // Q2: "What thought or moment stands out?" — memorable moments to savor
        case (.positive, 1):
            return QuestionChips(
                topRow: [
                    String(localized: "guided_chip_pos_moment_conversation"),
                    String(localized: "guided_chip_pos_moment_accomplished"),
                    String(localized: "guided_chip_pos_moment_calm"),
                    String(localized: "guided_chip_pos_moment_laugh"),
                    String(localized: "guided_chip_pos_moment_grateful_person"),
                    String(localized: "guided_chip_pos_moment_small_win"),
                ],
                expanded: [
                    String(localized: "guided_chip_pos_moment_beauty"),
                    String(localized: "guided_chip_pos_moment_connected"),
                    String(localized: "guided_chip_pos_moment_progress"),
                    String(localized: "guided_chip_pos_moment_like_myself"),
                    String(localized: "guided_chip_pos_moment_kindness"),
                    String(localized: "guided_chip_pos_moment_time_well_spent"),
                ]
            )

        // Q3: "How could you create more days like this?" — reinforcing actions
        case (.positive, 2):
            return QuestionChips(
                topRow: [
                    String(localized: "guided_chip_pos_act_more_of_this"),
                    String(localized: "guided_chip_pos_act_time_with_people"),
                    String(localized: "guided_chip_pos_act_get_outside"),
                    String(localized: "guided_chip_pos_act_stay_active"),
                    String(localized: "guided_chip_pos_act_keep_routine"),
                    String(localized: "guided_chip_pos_act_practice_gratitude"),
                ],
                expanded: [
                    String(localized: "guided_chip_pos_act_celebrate_wins"),
                    String(localized: "guided_chip_pos_act_hobbies"),
                    String(localized: "guided_chip_pos_act_help_someone"),
                    String(localized: "guided_chip_pos_act_say_yes"),
                    String(localized: "guided_chip_pos_act_rest"),
                    String(localized: "guided_chip_pos_act_limit_doomscroll"),
                ]
            )

        // MARK: Neutral (Average) — ACT Cognitive Defusion

        // Q1: "What feeling has been sitting with you?" — ambivalent feelings
        case (.neutral, 0):
            return QuestionChips(
                topRow: [
                    String(localized: "guided_chip_neu_boredom"),
                    String(localized: "guided_chip_neu_restlessness"),
                    String(localized: "guided_chip_neu_uncertainty"),
                    String(localized: "guided_chip_neu_numbness"),
                    String(localized: "guided_chip_neu_indifference"),
                    String(localized: "guided_chip_neu_distraction"),
                ],
                expanded: [
                    String(localized: "guided_chip_neu_flatness"),
                    String(localized: "guided_chip_neu_disconnection"),
                    String(localized: "guided_chip_neu_ambivalence"),
                    String(localized: "guided_chip_neu_weariness"),
                    String(localized: "guided_chip_neu_apathy"),
                    String(localized: "guided_chip_neu_autopilot"),
                ]
            )

        // Q2: "What thought is connected to that feeling?" — no chips (specific thought)
        // Q3: "Is that thought true, or something your mind is telling you?" — defusion reframes
        case (.neutral, 2):
            return QuestionChips(
                topRow: [
                    String(localized: "guided_chip_neu_def_just_a_thought"),
                    String(localized: "guided_chip_neu_def_storytelling"),
                    String(localized: "guided_chip_neu_def_thought_passed"),
                    String(localized: "guided_chip_neu_def_more_weight"),
                    String(localized: "guided_chip_neu_def_not_helpful"),
                    String(localized: "guided_chip_neu_def_notice_not_act"),
                    String(localized: "guided_chip_neu_def_dont_solve_now"),
                    String(localized: "guided_chip_neu_def_doesnt_define"),
                ],
                expanded: []
            )

        // Q4: "What matters to you about tomorrow?" — values-aligned intentions
        case (.neutral, 3):
            return QuestionChips(
                topRow: [
                    String(localized: "guided_chip_neu_val_be_present"),
                    String(localized: "guided_chip_neu_val_connect"),
                    String(localized: "guided_chip_neu_val_body"),
                    String(localized: "guided_chip_neu_val_meaningful_work"),
                    String(localized: "guided_chip_neu_val_kind_to_self"),
                    String(localized: "guided_chip_neu_val_small_goal"),
                ],
                expanded: [
                    String(localized: "guided_chip_neu_val_less_autopilot"),
                    String(localized: "guided_chip_neu_val_one_thing_better"),
                    String(localized: "guided_chip_neu_val_ask_what_i_need"),
                    String(localized: "guided_chip_neu_val_let_go"),
                ]
            )

        // MARK: Negative (Bad/Horrible) — CBT Thought Record

        // Q1: "What happened today…?" — no chips (situational)
        // Q2: "What thought kept coming back?" — common automatic negative thoughts
        case (.negative, 1):
            return QuestionChips(
                topRow: [
                    String(localized: "guided_chip_neg_not_good_enough"),
                    String(localized: "guided_chip_neg_nothing_goes_right"),
                    String(localized: "guided_chip_neg_all_my_fault"),
                    String(localized: "guided_chip_neg_cant_handle"),
                    String(localized: "guided_chip_neg_no_one_understands"),
                    String(localized: "guided_chip_neg_should_have"),
                ],
                expanded: [
                    String(localized: "guided_chip_neg_never_change"),
                    String(localized: "guided_chip_neg_falling_behind"),
                    String(localized: "guided_chip_neg_dont_matter"),
                    String(localized: "guided_chip_neg_something_wrong"),
                    String(localized: "guided_chip_neg_letting_down"),
                    String(localized: "guided_chip_neg_cant_do_right"),
                ]
            )

        // Q3: "What would you tell a friend?" — compassionate reframes
        case (.negative, 2):
            return QuestionChips(
                topRow: [
                    String(localized: "guided_chip_neg_too_hard"),
                    String(localized: "guided_chip_neg_one_bad_day"),
                    String(localized: "guided_chip_neg_better_than_think"),
                    String(localized: "guided_chip_neg_ok_to_struggle"),
                    String(localized: "guided_chip_neg_feeling_will_pass"),
                    String(localized: "guided_chip_neg_dont_need_figured"),
                    String(localized: "guided_chip_neg_not_whole_story"),
                    String(localized: "guided_chip_neg_give_grace"),
                ],
                expanded: []
            )

        // Q4: "More balanced way to see it?" — cognitive reframes first, grounding actions expanded
        case (.negative, 3):
            return QuestionChips(
                topRow: [
                    String(localized: "guided_chip_neg_act_worst_case"),
                    String(localized: "guided_chip_neg_act_facts_feelings"),
                    String(localized: "guided_chip_neg_act_matter_in_week"),
                    String(localized: "guided_chip_neg_act_got_through"),
                    String(localized: "guided_chip_neg_ref_one_chapter"),
                    String(localized: "guided_chip_neg_ref_doing_my_best"),
                ],
                expanded: [
                    String(localized: "guided_chip_neg_act_talk_someone"),
                    String(localized: "guided_chip_neg_act_write_it_out"),
                    String(localized: "guided_chip_neg_act_take_walk"),
                    String(localized: "guided_chip_neg_act_step_away"),
                    String(localized: "guided_chip_neg_act_get_rest"),
                    String(localized: "guided_chip_neg_act_one_small_thing"),
                ]
            )

        default:
            return nil
        }
    }
}

// MARK: - Guided Reflection

struct GuidedReflection: Codable, Equatable {

    struct Response: Codable, Equatable, Identifiable {
        var id: Int  // question index (0-based)
        let question: String
        var answer: String
        var selectedChips: [String] = []

        enum CodingKeys: String, CodingKey {
            case id, question, answer, selectedChips
        }

        init(id: Int, question: String, answer: String, selectedChips: [String] = []) {
            self.id = id
            self.question = question
            self.answer = answer
            self.selectedChips = selectedChips
        }

        init(from decoder: Decoder) throws {
            let container = try decoder.container(keyedBy: CodingKeys.self)
            id = try container.decode(Int.self, forKey: .id)
            question = try container.decode(String.self, forKey: .question)
            answer = try container.decode(String.self, forKey: .answer)
            selectedChips = try container.decodeIfPresent([String].self, forKey: .selectedChips) ?? []
        }
    }

    let moodCategory: MoodCategory
    var responses: [Response]
    var completedAt: Date?

    // MARK: - Computed Properties

    var isComplete: Bool {
        responses.count == moodCategory.questionCount &&
        responses.allSatisfy { !$0.answer.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty }
    }

    var answeredCount: Int {
        responses.filter { !$0.answer.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty }.count
    }

    var totalQuestions: Int {
        moodCategory.questionCount
    }

    // MARK: - Factory

    static func createNew(for mood: Mood) -> GuidedReflection {
        let category = MoodCategory(from: mood)
        let questionTexts = questions(for: category)
        let responses = questionTexts.enumerated().map { index, question in
            Response(id: index, question: question, answer: "")
        }
        return GuidedReflection(moodCategory: category, responses: responses, completedAt: nil)
    }

    static func questions(for category: MoodCategory) -> [String] {
        switch category {
        case .positive:
            return [
                String(localized: "guided_reflection_positive_q1"),
                String(localized: "guided_reflection_positive_q2"),
                String(localized: "guided_reflection_positive_q3"),
            ]
        case .neutral:
            return [
                String(localized: "guided_reflection_neutral_q1"),
                String(localized: "guided_reflection_neutral_q2"),
                String(localized: "guided_reflection_neutral_q3"),
                String(localized: "guided_reflection_neutral_q4"),
            ]
        case .negative:
            return [
                String(localized: "guided_reflection_negative_q1"),
                String(localized: "guided_reflection_negative_q2"),
                String(localized: "guided_reflection_negative_q3"),
                String(localized: "guided_reflection_negative_q4"),
            ]
        }
    }

    // MARK: - JSON Helpers

    func encode() -> String? {
        guard let data = try? JSONEncoder().encode(self) else { return nil }
        return String(data: data, encoding: .utf8)
    }

    static func decode(from json: String) -> GuidedReflection? {
        guard let data = json.data(using: .utf8) else { return nil }
        return try? JSONDecoder().decode(GuidedReflection.self, from: data)
    }
}