// ── Contextual Pre-Warning Messages ───────────────────────────
// Keyword → helpful prep message mapping. Expandable, no LLM needed.
// Used in notification body and on timeline to give actionable context.
// Ported from web/src/lib/context-messages.ts

import Foundation

// MARK: - Context Rule

struct ContextRule {
    let keywords: [String]
    let messages: [String]
}

// MARK: - Rules Engine

private let contextRules: [ContextRule] = [
    // Meetings & calls
    ContextRule(
        keywords: ["meeting", "standup", "sync", "huddle", "scrum", "1:1", "one-on-one"],
        messages: ["Review your agenda", "Check meeting notes", "Prepare talking points"]
    ),
    ContextRule(
        keywords: ["call", "phone", "dial"],
        messages: ["Have the number ready", "Review call notes", "Find a quiet spot"]
    ),
    ContextRule(
        keywords: ["interview", "screening"],
        messages: ["Review the job description", "Prepare your questions", "Test your camera and mic"]
    ),
    ContextRule(
        keywords: ["presentation", "demo", "pitch"],
        messages: ["Run through your slides", "Check your screen sharing", "Have backup ready"]
    ),

    // Travel & transport
    ContextRule(
        keywords: ["flight", "plane", "airport"],
        messages: ["Check in online", "Verify gate number", "Pack your carry-on"]
    ),
    ContextRule(
        keywords: ["train", "bus", "subway", "metro"],
        messages: ["Check for delays", "Have your ticket ready"]
    ),
    ContextRule(
        keywords: ["drive", "commute", "carpool", "uber", "lyft", "taxi", "cab"],
        messages: ["Check traffic conditions", "Grab your keys"]
    ),
    ContextRule(
        keywords: ["pickup", "pick up", "drop off", "dropoff"],
        messages: ["Confirm the location", "Check for any updates"]
    ),

    // Health & wellness
    ContextRule(
        keywords: ["doctor", "dentist", "therapist", "appointment", "clinic", "hospital"],
        messages: ["Bring your insurance card", "Leave with travel buffer", "Note any symptoms to mention"]
    ),
    ContextRule(
        keywords: ["medicine", "medication", "pill", "vitamin"],
        messages: ["Take with water", "Check dosage"]
    ),
    ContextRule(
        keywords: ["workout", "exercise", "gym", "run", "yoga", "stretch"],
        messages: ["Hydrate beforehand", "Change into workout clothes", "Warm up first"]
    ),

    // Food & cooking
    ContextRule(
        keywords: ["cook", "cooking", "bake", "baking", "oven", "recipe"],
        messages: ["Preheat the oven", "Gather your ingredients", "Check you have everything"]
    ),
    ContextRule(
        keywords: ["pasta", "noodle", "rice", "boil"],
        messages: ["Start boiling water", "Salt the water"]
    ),
    ContextRule(
        keywords: ["dinner", "lunch", "breakfast", "meal", "eat"],
        messages: ["Start prepping ingredients", "Set the table"]
    ),
    ContextRule(
        keywords: ["laundry", "washer", "dryer", "clothes"],
        messages: ["Move clothes to dryer", "Check pockets first"]
    ),

    // Work & productivity
    ContextRule(
        keywords: ["deadline", "due", "submit", "submission"],
        messages: ["Final review before submitting", "Double-check requirements"]
    ),
    ContextRule(
        keywords: ["class", "lecture", "lesson", "school", "study"],
        messages: ["Pack your materials", "Review last session notes"]
    ),
    ContextRule(
        keywords: ["focus", "deep work", "concentrate"],
        messages: ["Close unnecessary tabs", "Put phone on silent", "Grab water"]
    ),

    // Personal
    ContextRule(
        keywords: ["birthday", "anniversary", "celebration", "party"],
        messages: ["Check if the gift is ready", "Confirm the plan"]
    ),
    ContextRule(
        keywords: ["walk", "dog", "pet"],
        messages: ["Grab the leash", "Bring waste bags"]
    ),
    ContextRule(
        keywords: ["sleep", "bed", "bedtime", "wind down", "rest"],
        messages: ["Start winding down", "Put away screens", "Set tomorrow's alarm"]
    ),
    ContextRule(
        keywords: ["wake", "morning", "alarm"],
        messages: ["Time to get up!", "Stretch and hydrate"]
    ),
]

// MARK: - Lookup

/// Get a contextual message for a timer label.
/// Returns the first matching message, or nil if no match.
func getContextMessage(label: String) -> String? {
    let lower = label.lowercased()
    for rule in contextRules {
        if rule.keywords.contains(where: { lower.contains($0) }) {
            return rule.messages.first
        }
    }
    return nil
}

/// Get all matching contextual messages for a timer label.
/// Returns an array of messages from all matching rules.
func getAllContextMessages(label: String) -> [String] {
    let lower = label.lowercased()
    var messages: [String] = []
    for rule in contextRules {
        if rule.keywords.contains(where: { lower.contains($0) }) {
            if let first = rule.messages.first {
                messages.append(first)
            }
        }
    }
    return messages
}

/// Get a contextual message formatted for a pre-warning notification.
/// Includes the time remaining context.
func getWarningMessage(label: String, minutesBefore: Int) -> String {
    let contextMsg = getContextMessage(label: label)
    let timeStr: String
    if minutesBefore >= 60 {
        let hours = minutesBefore / 60
        let mins = minutesBefore % 60
        timeStr = mins > 0 ? "\(hours)h \(mins)m" : "\(hours)h"
    } else {
        timeStr = "\(minutesBefore)m"
    }

    let base = "\(label) in \(timeStr)"
    if let msg = contextMsg {
        return "\(base) — \(msg)"
    }
    return base
}

/// Check if a label matches any context rule.
func hasContextMatch(label: String) -> Bool {
    return getContextMessage(label: label) != nil
}

/// Get all registered context rules (for UI display / editing).
func getContextRules() -> [ContextRule] {
    return contextRules
}