/**
 * Price Calculator for Service Offerings
 * Handles interactive pricing calculation with sliders and plan selection
 */

class PriceCalculator {
    constructor() {
        this.pricingData = null;
        this.storagePrice = 0.15; // CHF per GB per month
        this.currentOffering = null;
        this.init();
    }

    // Initialize calculator elements and event listeners
    init() {
        // Get offering info from URL
        const pathParts = window.location.pathname.split('/');
        if (pathParts.length >= 4 && pathParts[1] === 'offering') {
            this.currentOffering = {
                provider_slug: pathParts[2],
                service_slug: pathParts[3]
            };
        }

        // Initialize DOM elements
        this.initElements();

        // Load pricing data and setup calculator
        if (this.currentOffering) {
            this.loadPricingData();
        }
    }

    // Initialize DOM element references
    initElements() {
        // Calculator controls
        this.cpuRange = document.getElementById('cpuRange');
        this.memoryRange = document.getElementById('memoryRange');
        this.storageRange = document.getElementById('storageRange');
        this.cpuValue = document.getElementById('cpuValue');
        this.memoryValue = document.getElementById('memoryValue');
        this.storageValue = document.getElementById('storageValue');
        this.serviceLevelInputs = document.querySelectorAll('input[name="serviceLevel"]');
        this.planSelect = document.getElementById('planSelect');

        // Result display elements
        this.planMatchStatus = document.getElementById('planMatchStatus');
        this.selectedPlanDetails = document.getElementById('selectedPlanDetails');
        this.noMatchFound = document.getElementById('noMatchFound');

        // Plan detail elements
        this.planGroup = document.getElementById('planGroup');
        this.planName = document.getElementById('planName');
        this.planDescription = document.getElementById('planDescription');
        this.planCpus = document.getElementById('planCpus');
        this.planMemory = document.getElementById('planMemory');
        this.managedServicePrice = document.getElementById('managedServicePrice');
        this.storagePriceEl = document.getElementById('storagePrice');
        this.storageAmount = document.getElementById('storageAmount');
        this.totalPrice = document.getElementById('totalPrice');
    }

    // Load pricing data from API endpoint
    async loadPricingData() {
        try {
            const response = await fetch(`/offering/${this.currentOffering.provider_slug}/${this.currentOffering.service_slug}/?pricing=json`);
            if (!response.ok) {
                throw new Error('Failed to load pricing data');
            }

            this.pricingData = await response.json();
            this.setupEventListeners();
            this.populatePlanDropdown();
            this.updatePricing();
        } catch (error) {
            console.error('Error loading pricing data:', error);
            this.showError('Failed to load pricing information');
        }
    }

    // Setup event listeners for calculator controls
    setupEventListeners() {
        if (!this.cpuRange || !this.memoryRange || !this.storageRange) return;

        // Setup service levels based on available data
        this.setupServiceLevels();

        // Slider event listeners
        this.cpuRange.addEventListener('input', () => {
            this.cpuValue.textContent = this.cpuRange.value;
            this.updatePricing();
        });

        this.memoryRange.addEventListener('input', () => {
            this.memoryValue.textContent = this.memoryRange.value;
            this.updatePricing();
        });

        this.storageRange.addEventListener('input', () => {
            this.storageValue.textContent = this.storageRange.value;
            this.updatePricing();
        });

        // Service level change listeners
        this.serviceLevelInputs.forEach(input => {
            input.addEventListener('change', () => {
                this.populatePlanDropdown();
                this.updatePricing();
            });
        });

        // Plan selection listener
        if (this.planSelect) {
            this.planSelect.addEventListener('change', () => {
                if (this.planSelect.value) {
                    const selectedPlan = JSON.parse(this.planSelect.value);

                    // Update sliders to match selected plan
                    this.cpuRange.value = selectedPlan.vcpus;
                    this.memoryRange.value = selectedPlan.ram;
                    this.cpuValue.textContent = selectedPlan.vcpus;
                    this.memoryValue.textContent = selectedPlan.ram;

                    this.updatePricingWithPlan(selectedPlan);
                } else {
                    this.updatePricing();
                }
            });
        }
    }

    // Setup service levels dynamically from pricing data
    setupServiceLevels() {
        if (!this.pricingData) return;

        const serviceLevelGroup = document.getElementById('serviceLevelGroup');
        if (!serviceLevelGroup) return;

        // Get all available service levels from the pricing data
        const availableServiceLevels = new Set();
        Object.keys(this.pricingData).forEach(groupName => {
            const group = this.pricingData[groupName];
            Object.keys(group).forEach(serviceLevel => {
                availableServiceLevels.add(serviceLevel);
            });
        });

        // Clear existing service level buttons
        serviceLevelGroup.innerHTML = '';

        // Create buttons for each available service level
        let isFirst = true;
        availableServiceLevels.forEach(serviceLevel => {
            const inputId = `serviceLevel${serviceLevel.replace(/\s+/g, '')}`;

            // Create radio input
            const input = document.createElement('input');
            input.type = 'radio';
            input.className = 'btn-check';
            input.name = 'serviceLevel';
            input.id = inputId;
            input.value = serviceLevel;
            if (isFirst) {
                input.checked = true;
                isFirst = false;
            }

            // Create label
            const label = document.createElement('label');
            label.className = 'btn btn-outline-primary';
            label.setAttribute('for', inputId);
            label.textContent = serviceLevel;

            // Add event listener
            input.addEventListener('change', () => {
                this.populatePlanDropdown();
                this.updatePricing();
            });

            serviceLevelGroup.appendChild(input);
            serviceLevelGroup.appendChild(label);
        });

        // Update the serviceLevelInputs reference
        this.serviceLevelInputs = document.querySelectorAll('input[name="serviceLevel"]');

        // Calculate and set slider maximums based on available plans
        this.updateSliderMaximums();
    }

    // Calculate maximum values for sliders based on available plans
    updateSliderMaximums() {
        if (!this.pricingData || !this.cpuRange || !this.memoryRange) return;

        let maxCpus = 0;
        let maxMemory = 0;

        // Find maximum CPU and memory across all plans
        Object.keys(this.pricingData).forEach(groupName => {
            const group = this.pricingData[groupName];
            Object.keys(group).forEach(serviceLevel => {
                group[serviceLevel].forEach(plan => {
                    const planCpus = parseFloat(plan.vcpus);
                    const planMemory = parseFloat(plan.ram);

                    if (planCpus > maxCpus) maxCpus = planCpus;
                    if (planMemory > maxMemory) maxMemory = planMemory;
                });
            });
        });

        // Set slider maximums with some padding
        if (maxCpus > 0) {
            this.cpuRange.max = Math.ceil(maxCpus);
            // Update the max display under the slider
            const cpuMaxDisplay = this.cpuRange.parentElement.querySelector('.d-flex.justify-content-between .text-muted span:last-child');
            if (cpuMaxDisplay) cpuMaxDisplay.textContent = Math.ceil(maxCpus);
        }

        if (maxMemory > 0) {
            this.memoryRange.max = Math.ceil(maxMemory);
            // Update the max display under the slider
            const memoryMaxDisplay = this.memoryRange.parentElement.querySelector('.d-flex.justify-content-between .text-muted span:last-child');
            if (memoryMaxDisplay) memoryMaxDisplay.textContent = Math.ceil(maxMemory) + ' GB';
        }
    }

    // Populate plan dropdown based on selected service level
    populatePlanDropdown() {
        if (!this.planSelect || !this.pricingData) return;

        const serviceLevel = document.querySelector('input[name="serviceLevel"]:checked')?.value;
        if (!serviceLevel) return;

        // Clear existing options
        this.planSelect.innerHTML = '<option value="">Auto-select best matching plan</option>';

        // Collect all plans for selected service level
        const availablePlans = [];
        Object.keys(this.pricingData).forEach(groupName => {
            const group = this.pricingData[groupName];
            if (group[serviceLevel]) {
                group[serviceLevel].forEach(plan => {
                    availablePlans.push({
                        ...plan,
                        groupName: groupName
                    });
                });
            }
        });

        // Sort plans by vCPU, then by RAM
        availablePlans.sort((a, b) => {
            if (parseInt(a.vcpus) !== parseInt(b.vcpus)) {
                return parseInt(a.vcpus) - parseInt(b.vcpus);
            }
            return parseInt(a.ram) - parseInt(b.ram);
        });

        // Add plans to dropdown
        availablePlans.forEach(plan => {
            const option = document.createElement('option');
            option.value = JSON.stringify(plan);
            option.textContent = `${plan.compute_plan} - ${plan.vcpus} vCPUs, ${plan.ram} GB RAM`;
            this.planSelect.appendChild(option);
        });
    }

    // Find best matching plan based on requirements
    findBestMatchingPlan(cpus, memory, serviceLevel) {
        if (!this.pricingData) return null;

        let bestMatch = null;
        let bestScore = Infinity;

        // Iterate through all groups and service levels
        Object.keys(this.pricingData).forEach(groupName => {
            const group = this.pricingData[groupName];

            if (group[serviceLevel]) {
                group[serviceLevel].forEach(plan => {
                    const planCpus = parseInt(plan.vcpus);
                    const planMemory = parseInt(plan.ram);

                    // Check if plan meets minimum requirements
                    if (planCpus >= cpus && planMemory >= memory) {
                        // Calculate efficiency score (lower is better)
                        const cpuOverhead = planCpus - cpus;
                        const memoryOverhead = planMemory - memory;
                        const score = cpuOverhead + memoryOverhead + plan.final_price * 0.1;

                        if (score < bestScore) {
                            bestScore = score;
                            bestMatch = {
                                ...plan,
                                groupName: groupName
                            };
                        }
                    }
                });
            }
        });

        return bestMatch;
    }

    // Update pricing with specific plan
    updatePricingWithPlan(selectedPlan) {
        const storage = parseInt(this.storageRange?.value || 20);

        this.showPlanDetails(selectedPlan, storage);
        this.updateStatusMessage('Plan selected directly!', 'success');
    }

    // Main pricing update function
    updatePricing() {
        if (!this.pricingData || !this.cpuRange || !this.memoryRange || !this.storageRange) return;

        // Reset plan selection if in auto-select mode
        if (!this.planSelect?.value) {
            const cpus = parseInt(this.cpuRange.value);
            const memory = parseInt(this.memoryRange.value);
            const storage = parseInt(this.storageRange.value);
            const serviceLevel = document.querySelector('input[name="serviceLevel"]:checked')?.value;

            if (!serviceLevel) return;

            // Find best matching plan
            const matchedPlan = this.findBestMatchingPlan(cpus, memory, serviceLevel);

            if (matchedPlan) {
                this.showPlanDetails(matchedPlan, storage);
                this.updateStatusMessage('Perfect match found!', 'success');
            } else {
                this.showNoMatch();
            }
        } else {
            // Plan is directly selected, update storage pricing
            const selectedPlan = JSON.parse(this.planSelect.value);
            this.updatePricingWithPlan(selectedPlan);
        }
    }

    // Show plan details in the UI
    showPlanDetails(plan, storage) {
        if (!this.selectedPlanDetails) return;

        // Show plan details section
        this.planMatchStatus.style.display = 'block';
        this.selectedPlanDetails.style.display = 'block';
        if (this.noMatchFound) this.noMatchFound.style.display = 'none';

        // Update plan information
        if (this.planGroup) this.planGroup.textContent = plan.groupName;
        if (this.planName) this.planName.textContent = plan.compute_plan;
        if (this.planDescription) this.planDescription.textContent = plan.compute_plan_group_description || '';
        if (this.planCpus) this.planCpus.textContent = plan.vcpus;
        if (this.planMemory) this.planMemory.textContent = plan.ram + ' GB';

        // Calculate pricing
        const computePriceValue = parseFloat(plan.compute_plan_price);
        const servicePriceValue = parseFloat(plan.sla_price);
        const managedServicePrice = computePriceValue + servicePriceValue;
        const storagePriceValue = storage * this.storagePrice;
        const totalPriceValue = managedServicePrice + storagePriceValue;

        // Update pricing display
        if (this.managedServicePrice) this.managedServicePrice.textContent = managedServicePrice.toFixed(2);
        if (this.storagePriceEl) this.storagePriceEl.textContent = storagePriceValue.toFixed(2);
        if (this.storageAmount) this.storageAmount.textContent = storage;
        if (this.totalPrice) this.totalPrice.textContent = totalPriceValue.toFixed(2);
    }

    // Show no matching plan found
    showNoMatch() {
        if (this.planMatchStatus) this.planMatchStatus.style.display = 'none';
        if (this.selectedPlanDetails) this.selectedPlanDetails.style.display = 'none';
        if (this.noMatchFound) this.noMatchFound.style.display = 'block';
    }

    // Update status message
    updateStatusMessage(message, type) {
        if (!this.planMatchStatus) return;

        const iconClass = type === 'success' ? 'bi-check-circle' : 'bi-info-circle';
        const textClass = type === 'success' ? 'text-success' : '';
        const alertClass = type === 'success' ? 'alert-success' : 'alert-info';

        this.planMatchStatus.innerHTML = `<i class="bi ${iconClass} me-2 ${textClass}"></i><span class="${textClass}">${message}</span>`;
        this.planMatchStatus.className = `alert ${alertClass} mb-3`;
        this.planMatchStatus.style.display = 'block';
    }

    // Show error message
    showError(message) {
        if (this.planMatchStatus) {
            this.planMatchStatus.innerHTML = `<i class="bi bi-exclamation-triangle me-2 text-danger"></i><span class="text-danger">${message}</span>`;
            this.planMatchStatus.className = 'alert alert-danger mb-3';
            this.planMatchStatus.style.display = 'block';
        }
    }
}

// Initialize calculator when DOM is loaded
document.addEventListener('DOMContentLoaded', () => {
    // Only initialize if we're on an offering detail page with pricing calculator
    if (document.getElementById('cpuRange')) {
        new PriceCalculator();
    }
});