pragma Singleton
import QtQuick
import Quickshell
import Quickshell.Io
import Quickshell.Services.UPower
import "../../../../config"

Item {
    id: root
    // show widget for laptop battery *or* UPS (your main PC), hide otherwise
    // displayDevice is aggregate - for UPS it is type Ups, isLaptopBattery is false
    property bool available: {
        const d = UPower.displayDevice
        if (d && d.ready && d.isPresent && (d.isLaptopBattery || d.type === UPowerDeviceType.Ups)) return true
        // fallback: scan all devices (some systems don't set DisplayDevice to UPS)
        const devs = UPower.devices.values
        for (let i = 0; i < devs.length; i++) {
            const dev = devs[i]
            if (dev.isPresent && (dev.isLaptopBattery || dev.type === UPowerDeviceType.Ups)) return true
        }
        return false
    }
    property real percentage: UPower.displayDevice.percentage*100
    // 'state' shadows Item.state (qmllint) -> use chargeState
    property string chargeState: UPowerDeviceState.toString(UPower.displayDevice.state)
    // keep alias via getter would still shadow, so expose via function if needed; prefer chargeState
    property bool charging: chargeState == "Charging"
    property bool full: chargeState == "FullyCharged"
    property real energy: UPower.displayDevice.energy
    property real energy_formated: Math.round(energy*10)/10
    property real time_to_empty: UPower.displayDevice.timeToEmpty
    property real time_to_full: UPower.displayDevice.timeToFull
    property real hour_to_empty: Math.floor(time_to_empty/3600)
    property real min_to_empty: Math.floor((time_to_empty%3600)/60)
    property real hour_to_full: Math.floor(time_to_full/3600)
    property real min_to_full: Math.floor((time_to_full%3600)/60)
    property real energy_rate: UPower.displayDevice.changeRate
    property real energy_rate_formated: Math.round(energy_rate*10)/10
    property bool healthSupported: UPower.displayDevice.healthSupported
    property real health: healthSupported ? UPower.displayDevice.healthPercentage : NaN

    property int _maxHistory: 60*60 // 1h window

    property var percentageHistory: [{time: Date.now() - _maxHistory*1000, value: 0}, {time: Date.now(), value: 0}]
    property var percentageHistoryExists: false
    property var energyHistory: [{time: Date.now() - _maxHistory*1000, value: 0}, {time: Date.now(), value: 0}]
    property var energyHistoryExists: false
    property var usageHistory: [{time: Date.now() - _maxHistory*1000, value: 0}, {time: Date.now(), value: 0}]
    property var usageHistoryExists: false

    // ---- persistence: survives reload AND close (FileView -> disk) ----
    // use Config.configDir (base dir) so path is stable and visible in repo
    readonly property string _historyPath: Config.configDir + "/modules/bar/states/Battery/battery_history.json"
    FileView {
        id: historyFile
        path: _historyPath
        printErrors: true
        // adapter holds json, synced to disk via writeAdapter()
        adapter: JsonAdapter {
            property var percentageHistory: []
            property var energyHistory: []
            property var usageHistory: []
        }
        onLoaded: {
            function prune(arr) {
                if (!arr || typeof arr.length !== "number" || arr.length===0) return null
                const f = arr.filter(p => p && typeof p.time==="number" && typeof p.value==="number")
                if (f.length < 2) return null
                return f.length > root._maxHistory ? f.slice(-root._maxHistory) : f
            }
            const p = prune(adapter.percentageHistory)
            if (p) { root.percentageHistory = p; root.percentageHistoryExists = p.some(i=>i.value!==0) }
            const e = prune(adapter.energyHistory)
            if (e) { root.energyHistory = e; root.energyHistoryExists = e.some(i=>i.value!==0) }
            const u = prune(adapter.usageHistory)
            if (u) { root.usageHistory = u; root.usageHistoryExists = u.some(i=>i.value!==0) }
        }
        onLoadFailed: {} // first run, file missing -> keep defaults
    }

    // periodic save every 10s (debounce-restart would never fire while statsTimer pushes every 1s)
    Timer {
        id: saveTimer
        interval: 10000
        repeat: true
        running: true
        onTriggered: {
            historyFile.adapter.percentageHistory = root.percentageHistory
            historyFile.adapter.energyHistory = root.energyHistory
            historyFile.adapter.usageHistory = root.usageHistory
            historyFile.writeAdapter()
        }
    }

    Timer {
        id: statsTimer
        interval: 1000
        repeat: true
        running: true
        onTriggered: {
            const now = Date.now()

            // Creating percentage History
            let pHist = root.percentageHistory.slice()
            pHist.push({time: now, value: percentage})
            if (pHist.length > root._maxHistory) pHist.shift()
            root.percentageHistoryExists = pHist.some(item => item.value !== 0 && item.value !== undefined)
            root.percentageHistory = pHist

            // Creating energy History
            let eHist = root.energyHistory.slice()
            eHist.push({time: now, value: energy_formated})
            if (eHist.length > root._maxHistory) eHist.shift()
            root.energyHistoryExists = eHist.some(item => item.value !== 0 && item.value !== undefined)
            root.energyHistory = eHist

            // Creating usage History
            let uHist = root.usageHistory.slice()
            uHist.push({time: now, value: energy_rate_formated})
            if (uHist.length > root._maxHistory) uHist.shift()
            root.usageHistoryExists = uHist.some(item => item.value !== 0 && item.value !== undefined)
            root.usageHistory = uHist
        }
    }

    // ensure save on clean close / reload (best-effort, reload preserves via FileView anyway)
    Component.onDestruction: {
        if (historyFile.loaded) {
            historyFile.adapter.percentageHistory = root.percentageHistory
            historyFile.adapter.energyHistory = root.energyHistory
            historyFile.adapter.usageHistory = root.usageHistory
            historyFile.writeAdapter()
        }
    }
}