/**
 * SAVE/LOAD SYSTEM & AGING ENGINE
 * Persistent storage for player progress, Kai aging, and companion states
 */

class SaveLoadSystem {
    constructor() {
        this.saveKey = 'mrtva_dolina_save';
        this.currentSave = null;
        this.autoSaveInterval = 300000; // 5 minutes
        this.autoSaveTimer = null;
    }

    /**
     * CREATE NEW SAVE FILE
     */
    createNewSave() {
        this.currentSave = {
            version: '1.0.0',
            created: new Date().toISOString(),
            lastSaved: new Date().toISOString(),

            // Player data
            player: {
                position: { x: 0, y: 0 },
                age_level: 1,     // 1-9 (corresponds to age stages)
                current_age: 14,  // Actual age in years
                age_sprite: 'kai_age14',
                inventory: [],
                equipped_tools: {
                    weapon: null,
                    tool: null
                },
                health: 100,
                stamina: 100,
                stats: {
                    strength: 1,
                    speed: 1,
                    farming: 1
                }
            },

            // Progress tracking
            progress: {
                memories_found: 0,
                total_memories: 100,
                quests_completed: [],
                quests_active: [],
                npcs_met: [],
                biomes_unlocked: ['grassland'],
                locations_discovered: [],
                enemies_defeated: 0,
                crops_harvested: 0,
                buildings_built: 0
            },

            // Companions
            companions: {
                gronk: {
                    unlocked: false,
                    level: 1,
                    xp: 0,
                    stats: {}
                },
                susi: {
                    unlocked: false,
                    position: { x: 0, y: 0 },
                    loyalty: 100
                }
            },

            // Farm state
            farm: {
                crops: [],
                buildings: [],
                animals: [],
                resources: {
                    wood: 0,
                    stone: 0,
                    cannabis_capital: 0
                }
            },

            // Economic state
            economy: {
                money: 0,
                cannabis_seeds: 5, // Starting capital!
                cannabis_harvested: 0,
                total_earnings: 0
            },

            // Game settings
            settings: {
                difficulty: 'normal',
                language: 'en',
                music_volume: 0.7,
                sfx_volume: 0.8
            },

            // Playtime
            playtime: 0 // seconds
        };

        console.log('💾 New save file created');
        return this.currentSave;
    }

    /**
     * SAVE GAME
     */
    save() {
        if (!this.currentSave) {
            this.currentSave = this.createNewSave();
        }

        this.currentSave.lastSaved = new Date().toISOString();

        try {
            localStorage.setItem(this.saveKey, JSON.stringify(this.currentSave));
            console.log('💾 Game saved successfully');

            // Show save notification
            this.showSaveNotification();

            return true;
        } catch (e) {
            console.error('❌ Save failed:', e);
            return false;
        }
    }

    /**
     * LOAD GAME
     */
    load() {
        try {
            const saved = localStorage.getItem(this.saveKey);
            if (!saved) {
                console.log('📂 No save file found, creating new...');
                return this.createNewSave();
            }

            this.currentSave = JSON.parse(saved);
            console.log('📂 Game loaded successfully');
            console.log('   Age Level:', this.currentSave.player.age_level);
            console.log('   Memories:', this.currentSave.progress.memories_found + '/' + this.currentSave.progress.total_memories);

            return this.currentSave;
        } catch (e) {
            console.error('❌ Load failed:', e);
            return this.createNewSave();
        }
    }

    /**
     * UPDATE PLAYER DATA
     */
    updatePlayer(data) {
        if (!this.currentSave) this.load();

        this.currentSave.player = {
            ...this.currentSave.player,
            ...data
        };

        this.save();
    }

    /**
     * UPDATE PROGRESS
     */
    updateProgress(data) {
        if (!this.currentSave) this.load();

        this.currentSave.progress = {
            ...this.currentSave.progress,
            ...data
        };

        // Check if aging should trigger
        this.checkAgingProgress();

        this.save();
    }

    /**
     * START AUTO-SAVE
     */
    startAutoSave() {
        if (this.autoSaveTimer) {
            clearInterval(this.autoSaveTimer);
        }

        this.autoSaveTimer = setInterval(() => {
            this.save();
            console.log('💾 Auto-save triggered');
        }, this.autoSaveInterval);
    }

    /**
     * STOP AUTO-SAVE
     */
    stopAutoSave() {
        if (this.autoSaveTimer) {
            clearInterval(this.autoSaveTimer);
            this.autoSaveTimer = null;
        }
    }

    /**
     * AGING ENGINE - CHECK IF KAI SHOULD AGE UP
     */
    checkAgingProgress() {
        if (!this.currentSave) return;

        const memoriesFound = this.currentSave.progress.memories_found;
        const totalMemories = this.currentSave.progress.total_memories;
        const progress = (memoriesFound / totalMemories) * 100;

        let newAgeLevel = 1;
        let newAge = 14;
        let newSprite = 'kai_age14';

        // Age progression based on memory recovery
        if (progress >= 90) {
            newAgeLevel = 9;
            newAge = 60;
            newSprite = 'kai_age60';
        } else if (progress >= 75) {
            newAgeLevel = 7;
            newAge = 50;
            newSprite = 'kai_age50';
        } else if (progress >= 60) {
            newAgeLevel = 6;
            newAge = 40;
            newSprite = 'kai_age40';
        } else if (progress >= 50) {
            newAgeLevel = 5;
            newAge = 30;
            newSprite = 'kai_age30';
        } else if (progress >= 35) {
            newAgeLevel = 4;
            newAge = 25;
            newSprite = 'kai_age25';
        } else if (progress >= 25) {
            newAgeLevel = 3;
            newAge = 20;
            newSprite = 'kai_age20';
        } else if (progress >= 10) {
            newAgeLevel = 2;
            newAge = 16;
            newSprite = 'kai_age16';
        }

        // Check if age changed
        if (newAgeLevel > this.currentSave.player.age_level) {
            this.triggerAging(newAgeLevel, newAge, newSprite);
        }
    }

    /**
     * TRIGGER AGING CUTSCENE
     */
    triggerAging(newLevel, newAge, newSprite) {
        const oldLevel = this.currentSave.player.age_level;
        const oldAge = this.currentSave.player.current_age;

        // Update save data
        this.currentSave.player.age_level = newLevel;
        this.currentSave.player.current_age = newAge;
        this.currentSave.player.age_sprite = newSprite;

        console.log(`⏰ KAI AGES UP!`);
        console.log(`   ${oldAge} → ${newAge} years old`);
        console.log(`   Sprite: ${newSprite}`);

        // Emit aging event for cutscene
        const event = new CustomEvent('kai-aging', {
            detail: {
                oldLevel: oldLevel,
                newLevel: newLevel,
                oldAge: oldAge,
                newAge: newAge,
                newSprite: newSprite,
                memoriesFound: this.currentSave.progress.memories_found
            }
        });
        window.dispatchEvent(event);

        this.save();
    }

    /**
     * SHOW SAVE NOTIFICATION
     */
    showSaveNotification() {
        const event = new CustomEvent('game-saved', {
            detail: {
                time: new Date().toLocaleTimeString(),
                slot: 1
            }
        });
        window.dispatchEvent(event);
    }

    /**
     * GET CURRENT SAVE DATA
     */
    getCurrentSave() {
        if (!this.currentSave) {
            this.load();
        }
        return this.currentSave;
    }

    /**
     * DELETE SAVE
     */
    deleteSave() {
        if (confirm('Are you sure you want to delete your save file?')) {
            localStorage.removeItem(this.saveKey);
            this.currentSave = null;
            console.log('🗑️ Save file deleted');
            return true;
        }
        return false;
    }

    /**
     * EXPORT SAVE (for backup)
     */
    exportSave() {
        if (!this.currentSave) return null;

        const saveData = JSON.stringify(this.currentSave, null, 2);
        const blob = new Blob([saveData], { type: 'application/json' });
        const url = URL.createObjectURL(blob);

        const a = document.createElement('a');
        a.href = url;
        a.download = `mrtva_dolina_save_${Date.now()}.json`;
        a.click();

        console.log('📤 Save exported');
    }

    /**
     * IMPORT SAVE (from backup)
     */
    importSave(fileInput) {
        const file = fileInput.files[0];
        if (!file) return;

        const reader = new FileReader();
        reader.onload = (e) => {
            try {
                const imported = JSON.parse(e.target.result);
                localStorage.setItem(this.saveKey, JSON.stringify(imported));
                this.currentSave = imported;
                console.log('📥 Save imported successfully');
            } catch (err) {
                console.error('❌ Import failed:', err);
            }
        };
        reader.readAsText(file);
    }
}

// Singleton instance
const saveLoadSystem = new SaveLoadSystem();
export default saveLoadSystem;