let prevMonthBtn, nextMonthBtn, month
let prevWeekBtn, nextWeekBtn, week
let curYear = new Date().getFullYear()
let curMonth = new Date().getMonth()
let curWeekDate = new Date()

function prevMonth() {
    curMonth = curMonth - 1
    if (curMonth < 0) {
        curMonth += 12
        curYear -= 1
    }
    updateTableMonthly()
}
function nextMonth() {
    curMonth = curMonth + 1
    if (curMonth >= 12) {
        curMonth -= 12
        curYear += 1
    }
    updateTableMonthly()
}
function prevWeek() {
    curWeekDate = new Date(curWeekDate.valueOf() - 7 * DAY_MS)
    updateTableWeekly()
}
function nextWeek() {
    curWeekDate = new Date(curWeekDate.valueOf() + 7 * DAY_MS)
    updateTableWeekly()
}

function updateTableMonthly() {
    let year = curYear.toString().padStart(4, "0")
    let month = (curMonth + 1).toString().padStart(2, "0")
    let today = new Date()
    let txt = MONTHS[curMonth]
    if (today.getFullYear() !== curYear) {
        txt += " " + year.toString().padStart(4, "0")
    }
    document.getElementById("month").innerText = txt

    fetch(`stats/by-month/${year}/${month}/`).then(res => {
        return res.json()
    }).then(res => {
        if (res.status !== "success") {
            return
        }
        updateTable(res.data)
    })
}

function updateTableWeekly() {
    let weekNum = curWeekDate.getWeek()
    let weekDay = (curWeekDate.getDay() + 6) % 7
    let startDate = new Date(curWeekDate.valueOf() - weekDay * DAY_MS)
    let endDate = new Date(startDate.valueOf() + 6 * DAY_MS)

    let today = new Date()
    let date = `${MONTHS[startDate.getMonth()]} ${startDate.getDate()}`
    if (startDate.getFullYear() !== today.getFullYear()) {
        date += " " + startDate.getFullYear().toString().padStart(4, "0")
    }
    document.getElementById("week").innerText = `Week ${weekNum} (${date})`

    fetch(`stats/between/${formatDate(startDate)}/${formatDate(endDate)}/`).then(res => {
        return res.json()
    }).then(res => {
        if (res.status !== "success") {
            return
        }
        updateTable(res.data)
    })
}

function updateTable(data) {
    let totalWorked = data.clockings.map(c => c.total).reduce((a, b) => a + b, 0)

    let parents = data.parents.filter(parent => parent.duration !== null && parent.is_productive)

    let headers = document.getElementById("headers-table")
    let table = document.getElementById("projects-table")
    let projNames = table.querySelector(".project-names")
    let projNums = table.querySelector(".project-nums")
    let totDurations = table.querySelector(".total-durations")
    let workingRatios = table.querySelector(".working-time-ratios")
    let imputedRatios = table.querySelector(".imputed-time-ratios")
    let sagexHours = table.querySelector(".sagex-hours")
    let realSagexHours = table.querySelector(".real-sagex-hours")
    let differences = table.querySelector(".sagex-diff")
    table.querySelectorAll("tr").forEach(row => row.innerHTML = "")

    let totalImputed = 0
    parents.forEach(parent => {
        totalImputed += +parent.duration
    })
    headers.querySelector(".total-clocking").innerText = formatDuration(totalWorked)
    headers.querySelector(".total-duration").innerText = formatDuration(totalImputed)

    let sagexHoursTemplate = getTemplate("sagex-hours")

    let totalSagex = 0
    let totalRealSagex = 0
    parents.forEach(parent => {
        let duration = +parent.duration
        let name = document.createElement("th")
        name.innerText = parent.name
        projNames.appendChild(name)
        projNums.insertCell(-1).innerText = parent.project_num
        table.querySelector(".clocking").insertCell(-1)
        totDurations.insertCell(-1).innerText = formatDuration(duration)

        let ratioWorking = duration / totalWorked
        let ratioImputed = duration / totalImputed
        workingRatios.insertCell(-1).innerText = formatPercentage(ratioWorking)
        imputedRatios.insertCell(-1).innerText = formatPercentage(ratioImputed)
        let sagexDuration = duration * totalWorked / totalImputed
        totalSagex += sagexDuration
        let sagexCell = sagexHours.insertCell(-1)
        sagexCell.innerText = formatDuration(sagexDuration)
        sagexCell.dataset.duration = sagexDuration

        let td = sagexHoursTemplate.cloneNode(true)
        let [h, m, s] = parent.real_sagex_hours.split(":")
        let hoursInput = td.querySelector("input.hours")
        let minutesInput = td.querySelector("input.minutes")
        hoursInput.value = h
        minutesInput.value = m
        let timeout = null
        minutesInput.addEventListener("input", () => reformatTime(minutesInput))
        td.addEventListener("change", () => {
            if (timeout !== null) {
                clearTimeout(timeout)
            }
            timeout = setTimeout(() => {
                updateSagex(parent.id, td)
            }, 1000)
        })
        realSagexHours.appendChild(td)
        let real = (+h)*60 + (+m)
        let diff = real - sagexDuration
        differences.insertCell(-1).innerText = formatDuration(diff)
        totalRealSagex += real
    })
    headers.querySelector(".sagex-hours-total").innerText = formatDuration(totalSagex)
    headers.querySelector(".real-sagex-hours-total").innerText = formatDuration(totalRealSagex)
    headers.querySelector(".sagex-diff-total").innerText = formatDuration(totalRealSagex - totalSagex)
}

function reformatTime(input) {
    let value = input.value
    if (value.length === 1) {
        input.value = "0" + value
    } else if (value.length > 2) {
        input.value = value.slice(value.length - 2)
    }
}

function getDuration(td) {
    let hours = +td.querySelector(".hours").value
    let minutes = +td.querySelector(".minutes").value
    return hours * 60 + minutes
}

function updateSagex(id, cell) {
    let minutesInput = cell.querySelector(".minutes")
    reformatTime(minutesInput)

    let newDuration = getDuration(cell)
    let year = curYear.toString().padStart(4, "0")
    let month = (curMonth + 1).toString().padStart(2, "0")
    let date = `${year}-${month}`
    let fd = new FormData()
    fd.set("minutes", newDuration)

    req(`/sagex/${id}/${date}/`, {
        method: "POST",
        body: fd
    }).then(res => {
        return res.json()
    }).then(res => {
        if (res.status === "success") {
            cell.classList.add("saved")
            cell.addEventListener("animationend", () => {
                cell.classList.remove("saved")
            }, {once: true})
            let theoreticalRow = document.querySelector("#projects-table tr.sagex-hours")
            let realRow = document.querySelector("#projects-table tr.real-sagex-hours")
            let diffRow = document.querySelector("#projects-table tr.sagex-diff")
            let totalRealCell = document.querySelector("#headers-table tr.real-sagex-hours .real-sagex-hours-total")
            let totalDiffCell = document.querySelector("#headers-table tr.sagex-diff .sagex-diff-total")

            let durationsTheory = Array.from(theoreticalRow.cells).map(c => +c.dataset.duration)
            let durationsReal = Array.from(realRow.cells).map(getDuration)
            let totalTheory = durationsTheory.reduce((a, b) => a + b, 0)
            let totalReal = durationsReal.reduce((a, b) => a + b, 0)
            let totalDiff = totalReal - totalTheory
            totalRealCell.innerText = formatDuration(totalReal)
            totalDiffCell.innerText = formatDuration(totalDiff)

            let theory = +theoreticalRow.cells[cell.cellIndex].dataset.duration
            let diff = newDuration - theory
            diffRow.cells[cell.cellIndex].innerText = formatDuration(diff)

        } else {
            alert(res.error)
        }
    })
}

window.addEventListener("load", () => {
    prevMonthBtn = document.getElementById("prev-month")
    nextMonthBtn = document.getElementById("next-month")
    month = document.getElementById("month")

    /*prevWeekBtn = document.getElementById("prev-week")
    nextWeekBtn = document.getElementById("next-week")
    week = document.getElementById("week")*/

    prevMonthBtn.addEventListener("click", () => prevMonth())
    nextMonthBtn.addEventListener("click", () => nextMonth())
    /*prevWeekBtn.addEventListener("click", () => prevWeek())
    nextWeekBtn.addEventListener("click", () => nextWeek())*/

    let monthGrp = document.getElementById("month-sel")
    //let weekGrp = document.getElementById("week-sel")

    /*
    rangeSel = document.getElementById("range-sel")
    rangeSel.addEventListener("change", () => {
        let mode = rangeSel.value
        if (mode === "weekly") {
            monthGrp.classList.add("hidden")
            weekGrp.classList.remove("hidden")
            updateTableWeekly()
        } else {
            monthGrp.classList.remove("hidden")
            weekGrp.classList.add("hidden")
            updateTableMonthly()
        }
    })
    */

    updateTableMonthly()
})