-- AltSystem Build Skills UI
-- Creates the Build Skills tab content with editable skill rows, add/delete functionality, and save to TRP.

AltSystem = AltSystem or {}

local PADDING = 12
local ROW_HEIGHT = 36
local ROW_SPACING = 8
local NAME_WIDTH = 340
local LEVEL_WIDTH = 140
local VALUE_WIDTH = 80
local DELETE_WIDTH = 30

-- Working copy of skills being edited (not saved until user clicks Save)
local editableSkills = {}

-- Pool of created row frames for reuse
local skillRowFrames = {}

-- References set during creation
local scrollFrame, scrollChild, addRowButton

-- ─── Create a single skill row frame ────────────────────────────────────────

local function CreateSkillRowFrame(index)
    local row = CreateFrame("Frame", "AltSystemSkillRow" .. index, scrollChild)
    row:SetHeight(ROW_HEIGHT)

    -- Dark background
    local bg = row:CreateTexture(nil, "BACKGROUND")
    bg:SetAllPoints()
    bg:SetColorTexture(0.1, 0.1, 0.1, 0.8)
    row.bg = bg

    -- Name EditBox
    local nameBox = CreateFrame("EditBox", "AltSystemSkillName" .. index, row, "InputBoxTemplate")
    nameBox:SetPoint("LEFT", row, "LEFT", 8, 0)
    nameBox:SetSize(NAME_WIDTH, 24)
    nameBox:SetAutoFocus(false)
    nameBox:SetFontObject("GameFontHighlight")
    row.nameBox = nameBox

    -- Level Dropdown
    local levelDropdown = CreateFrame("DropdownButton", "AltSystemSkillLevel" .. index, row, "WowStyle1DropdownTemplate")
    levelDropdown:SetPoint("LEFT", nameBox, "RIGHT", 12, 0)
    levelDropdown:SetWidth(LEVEL_WIDTH)
    row.levelDropdown = levelDropdown

    -- Value Dropdown
    local valueDropdown = CreateFrame("DropdownButton", "AltSystemSkillValue" .. index, row, "WowStyle1DropdownTemplate")
    valueDropdown:SetPoint("LEFT", levelDropdown, "RIGHT", 8, 0)
    valueDropdown:SetWidth(VALUE_WIDTH)
    row.valueDropdown = valueDropdown

    -- Delete Button
    local deleteBtn = CreateFrame("Button", "AltSystemSkillDelete" .. index, row)
    deleteBtn:SetSize(DELETE_WIDTH, DELETE_WIDTH)
    deleteBtn:SetPoint("LEFT", valueDropdown, "RIGHT", 8, 0)

    local deleteBg = deleteBtn:CreateTexture(nil, "BACKGROUND")
    deleteBg:SetAllPoints()
    deleteBg:SetColorTexture(0.5, 0.1, 0.1, 0.9)
    deleteBtn.bg = deleteBg

    local deleteText = deleteBtn:CreateFontString(nil, "OVERLAY", "GameFontNormal")
    deleteText:SetPoint("CENTER")
    deleteText:SetText("X")
    deleteText:SetTextColor(1, 0.3, 0.3)

    deleteBtn:SetScript("OnEnter", function(self)
        self.bg:SetColorTexture(0.7, 0.15, 0.15, 1)
    end)
    deleteBtn:SetScript("OnLeave", function(self)
        self.bg:SetColorTexture(0.5, 0.1, 0.1, 0.9)
    end)

    row.deleteBtn = deleteBtn

    return row
end

-- ─── Refresh all skill rows ─────────────────────────────────────────────────

local function RefreshSkillRows()
    -- Hide all existing row frames
    for _, row in ipairs(skillRowFrames) do
        row:Hide()
    end

    local yPos = 0

    for i, skillData in ipairs(editableSkills) do
        local row = skillRowFrames[i]
        if not row then
            row = CreateSkillRowFrame(i)
            skillRowFrames[i] = row
        end

        -- Clear previous anchor points before repositioning
        row:ClearAllPoints()
        row:SetPoint("TOPLEFT", scrollChild, "TOPLEFT", 0, -yPos)
        row:SetPoint("TOPRIGHT", scrollChild, "TOPRIGHT", 0, -yPos)

        -- Populate name
        row.nameBox:SetText(skillData.name or "")
        row.nameBox:SetScript("OnTextChanged", function(self)
            local idx = nil
            for j, s in ipairs(editableSkills) do
                if skillRowFrames[j] == row then
                    idx = j
                    break
                end
            end
            if idx then
                editableSkills[idx].name = self:GetText()
            end
        end)

        -- Setup level dropdown
        local currentRowIndex = i
        row.levelDropdown:SetupMenu(function(dropdown, rootDescription)
            for _, levelName in ipairs(AltSystem.Data.SkillLevelOrder) do
                rootDescription:CreateRadio(
                    levelName,
                    function()
                        return editableSkills[currentRowIndex] and editableSkills[currentRowIndex].level == levelName
                    end,
                    function()
                        if editableSkills[currentRowIndex] then
                            editableSkills[currentRowIndex].level = levelName
                            editableSkills[currentRowIndex].value = AltSystem.Data:GetDefaultValueForLevel(levelName)
                            RefreshSkillRows()
                        end
                    end
                )
            end
        end)

        -- Setup value dropdown based on current level
        local range = AltSystem.Data.SkillValueRanges[skillData.level]
        if range then
            row.valueDropdown:SetupMenu(function(dropdown, rootDescription)
                for v = range.min, range.max do
                    rootDescription:CreateRadio(
                        tostring(v),
                        function()
                            return editableSkills[currentRowIndex] and editableSkills[currentRowIndex].value == v
                        end,
                        function()
                            if editableSkills[currentRowIndex] then
                                editableSkills[currentRowIndex].value = v
                            end
                        end
                    )
                end
            end)
        end

        -- Bind delete button for current index
        row.deleteBtn:SetScript("OnClick", function()
            table.remove(editableSkills, currentRowIndex)
            RefreshSkillRows()
        end)

        row:Show()
        yPos = yPos + ROW_HEIGHT + ROW_SPACING
    end

    -- Reposition Add A Row button
    if addRowButton then
        addRowButton:ClearAllPoints()
        addRowButton:SetPoint("TOPRIGHT", scrollChild, "TOPRIGHT", -PADDING, -(yPos + 4))
    end

    -- Update scroll child height
    local totalHeight = yPos + ROW_HEIGHT + 20 -- extra space for Add A Row button
    if scrollChild then
        scrollChild:SetHeight(math.max(totalHeight, 1))
    end
end

-- ─── Create Build Skills Content ────────────────────────────────────────────

function AltSystem:CreateBuildSkillsContent(parentFrame)
    local contentWidth = parentFrame:GetWidth() or 692
    local contentHeight = parentFrame:GetHeight() or 444

    local yPos = -PADDING

    -- Info text paragraph 1
    local info1 = parentFrame:CreateFontString(nil, "OVERLAY", "GameFontNormal")
    info1:SetPoint("TOPLEFT", parentFrame, "TOPLEFT", PADDING, yPos)
    info1:SetPoint("TOPRIGHT", parentFrame, "TOPRIGHT", -PADDING, yPos)
    info1:SetJustifyH("LEFT")
    info1:SetText("All skills below are directly extracted from your TRP's characteristics sheet. You can view and edit them there at any time.")
    info1:SetTextColor(0.9, 0.75, 0.2)
    info1:SetWordWrap(true)

    yPos = yPos - (info1:GetStringHeight() or 16) - 10

    -- Info text paragraph 2
    local info2 = parentFrame:CreateFontString(nil, "OVERLAY", "GameFontNormal")
    info2:SetPoint("TOPLEFT", parentFrame, "TOPLEFT", PADDING, yPos)
    info2:SetPoint("TOPRIGHT", parentFrame, "TOPRIGHT", -PADDING, yPos)
    info2:SetJustifyH("LEFT")
    info2:SetText("This menu serves as an easy alternative for if you want to use this system fast without diving deep into understanding it and/or styling your TRP sheet at this point in time. All your changes made will not be saved to TRP up until you hit the specific button to do so.")
    info2:SetTextColor(0.9, 0.75, 0.2)
    info2:SetWordWrap(true)

    yPos = yPos - (info2:GetStringHeight() or 32) - 16

    -- "Skill list" section header
    local sectionHeader = parentFrame:CreateFontString(nil, "OVERLAY", "GameFontNormalLarge")
    sectionHeader:SetPoint("TOPLEFT", parentFrame, "TOPLEFT", PADDING, yPos)
    sectionHeader:SetText("Skill list")
    sectionHeader:SetTextColor(1, 1, 1)

    yPos = yPos - 24

    -- Column headers
    local nameHeader = parentFrame:CreateFontString(nil, "OVERLAY", "GameFontNormal")
    nameHeader:SetPoint("TOPLEFT", parentFrame, "TOPLEFT", PADDING + 8, yPos)
    nameHeader:SetText("Name")
    nameHeader:SetTextColor(0.9, 0.75, 0.2)

    local levelHeader = parentFrame:CreateFontString(nil, "OVERLAY", "GameFontNormal")
    levelHeader:SetPoint("TOPLEFT", parentFrame, "TOPLEFT", PADDING + 8 + NAME_WIDTH + 12, yPos)
    levelHeader:SetText("Level")
    levelHeader:SetTextColor(0.9, 0.75, 0.2)

    local valueHeader = parentFrame:CreateFontString(nil, "OVERLAY", "GameFontNormal")
    valueHeader:SetPoint("TOPLEFT", parentFrame, "TOPLEFT", PADDING + 8 + NAME_WIDTH + 12 + LEVEL_WIDTH + 8, yPos)
    valueHeader:SetText("Value")
    valueHeader:SetTextColor(0.9, 0.75, 0.2)

    yPos = yPos - 20

    -- Save button (pinned to bottom, outside scroll frame)
    local saveButton = CreateFrame("Button", "AltSystemSaveSkillsButton", parentFrame, "UIPanelButtonTemplate")
    saveButton:SetSize(180, 30)
    saveButton:SetPoint("BOTTOM", parentFrame, "BOTTOM", 0, PADDING)
    saveButton:SetText("Save Skills to TRP")

    -- Style the save button with a dark red tint
    local saveBg = saveButton:CreateTexture(nil, "BACKGROUND")
    saveBg:SetAllPoints()
    saveBg:SetColorTexture(0.4, 0.08, 0.08, 0.9)

    saveButton:SetScript("OnClick", function()
        local success = AltSystem.Data:SaveSkills(editableSkills)
        if success and AltSystem.RefreshSkillDropdown then
            AltSystem:RefreshSkillDropdown()
        end
    end)

    -- Scrollable skill list area (between column headers and save button)
    scrollFrame = CreateFrame("ScrollFrame", "AltSystemBuildSkillsScrollFrame", parentFrame, "UIPanelScrollFrameTemplate")
    scrollFrame:SetPoint("TOPLEFT", parentFrame, "TOPLEFT", PADDING, yPos)
    scrollFrame:SetPoint("BOTTOMRIGHT", parentFrame, "BOTTOMRIGHT", -PADDING - 22, saveButton:GetHeight() + PADDING + 8)

    scrollChild = CreateFrame("Frame", "AltSystemBuildSkillsScrollChild", scrollFrame)
    scrollChild:SetWidth(scrollFrame:GetWidth() or (contentWidth - PADDING * 2 - 22))
    scrollChild:SetHeight(1)
    scrollFrame:SetScrollChild(scrollChild)

    -- Update scroll child width when frame resizes
    scrollFrame:SetScript("OnSizeChanged", function(self)
        scrollChild:SetWidth(self:GetWidth())
    end)

    -- "Add A Row" button (inside scroll child, below last row)
    addRowButton = CreateFrame("Button", "AltSystemAddRowButton", scrollChild, "UIPanelButtonTemplate")
    addRowButton:SetSize(130, 26)
    addRowButton:SetText("+ Add A Row")
    addRowButton:SetPoint("TOPRIGHT", scrollChild, "TOPRIGHT", -PADDING, 0)

    -- Style add row button
    local addBg = addRowButton:CreateTexture(nil, "BACKGROUND")
    addBg:SetAllPoints()
    addBg:SetColorTexture(0.4, 0.08, 0.08, 0.9)

    addRowButton:SetScript("OnClick", function()
        table.insert(editableSkills, {
            name  = "Skillname",
            level = "Novice",
            value = 1,
            icon  = "inv_misc_questionmark",
            isNew = true,
        })
        RefreshSkillRows()

        -- Auto-scroll to bottom to show the new row
        C_Timer.After(0.05, function()
            if scrollFrame then
                scrollFrame:SetVerticalScroll(scrollFrame:GetVerticalScrollRange())
            end
        end)
    end)

    AltSystem.BuildSkillsScrollFrame = scrollFrame
    AltSystem.BuildSkillsScrollChild = scrollChild
end

-- ─── Refresh Build Skills list (called on tab switch) ───────────────────────

function AltSystem:RefreshBuildSkillsList()
    -- Reload skills from TRP3 into working copy, discarding any unsaved edits
    editableSkills = AltSystem.Data:GetEditableSkills()
    RefreshSkillRows()
end