---@class Migration
local Migration = QuestieLoader:CreateModule("Migration")
---@type l10n
local l10n = QuestieLoader:ImportModule("l10n")

-- add functions to this table to migrate users who have not yet run said function.
-- make sure to always add to the end of the table as it runs first to last
local migrationFunctions = {
    [1] = function()
        -- this is the big Questie v9.0 settings refactor, implementing profiles
        if Questie.db.char then -- if you actually have previous settings, then on first startup we should notify you of this
            Questie:Print("[Migration] Migrated Questie for v9.0. This will reset all Questie settings to default. Journey history has been preserved.")
        end
        -- theres no need to delete old settings, since we read/write to different addresses now;
        -- old settings can linger unused unless you roll back versions, no harm no foul
    end,
    [2] = function()
        -- Blizzard removed some sounds from Era/SoD, which are present in WotLK
        local objectiveSound = Questie.db.profile.objectiveCompleteSoundChoiceName
        if (not (Questie.IsWotlk or QuestieCompat.Is335)) and
            objectiveSound == "Explosion" or
            objectiveSound == "Shing!" or
            objectiveSound == "Wham!" or
            objectiveSound == "Simon Chime" or
            objectiveSound == "War Drums" or
            objectiveSound == "Humm" or
            objectiveSound == "Short Circuit"
        then
            Questie.db.profile.objectiveCompleteSoundChoiceName = "ObjectiveDefault"
        end

        local progressSound = Questie.db.profile.objectiveProgressSoundChoiceName
        if (not (Questie.IsWotlk or QuestieCompat.Is335)) and
            progressSound == "Explosion" or
            progressSound == "Shing!" or
            progressSound == "Wham!" or
            progressSound == "Simon Chime" or
            progressSound == "War Drums" or
            progressSound == "Humm" or
            progressSound == "Short Circuit"
        then
            Questie.db.profile.objectiveProgressSoundChoiceName = "ObjectiveProgress"
        end
    end,
    [3] = function()
        if Questie.IsSoD then
            if Questie.db.profile.showSoDRunes then
                Questie.db.profile.showRunesOfPhase = {
                    phase1 = true,
                    phase2 = false,
                    phase3 = false,
                    phase4 = false,
                }
            else
                Questie.db.profile.showRunesOfPhase = {
                    phase1 = false,
                    phase2 = false,
                    phase3 = false,
                    phase4 = false,
                }
            end
        end
    end,
    [4] = function()
        Questie.db.profile.tutorialShowRunesDone = false
    end,
    [5] = function()
        Questie.db.profile.enableTooltipsNextInChain = true
    end,
    [6] = function()
        if Questie.dbCache and Questie.dbCache.global then
            Questie:Debug(Questie.DEBUG_INFO, "[Migration] Offloading compiled database binary blobs to separate SavedVariable...")
            local keys = {"npcBin", "npcPtrs", "questBin", "questPtrs", "objBin", "objPtrs", "itemBin", "itemPtrs"}
            -- Handle standard keys
            for _, k in ipairs(keys) do
                if Questie.db.global[k] then
                    Questie.dbCache.global[k] = Questie.db.global[k]
                    Questie.db.global[k] = nil
                end
            end
            -- Handle SoD keys
            if Questie.db.global.sod then
                Questie.dbCache.global.sod = Questie.dbCache.global.sod or {}
                for _, k in ipairs(keys) do
                    if Questie.db.global.sod[k] then
                        Questie.dbCache.global.sod[k] = Questie.db.global.sod[k]
                        Questie.db.global.sod[k] = nil
                    end
                end
                -- Also move other SoD metadata
                local sodMetadata = {"dbCompiledOnVersion", "dbCompiledLang", "dbIsCompiled", "dbCompiledCount"}
                for _, k in ipairs(sodMetadata) do
                    if Questie.db.global.sod[k] then
                        Questie.dbCache.global.sod[k] = Questie.db.global.sod[k]
                        Questie.db.global.sod[k] = nil
                    end
                end
            end
            -- Move global metadata
            local globalMetadata = {"dbCompiledExpansion", "dbCompiledPluginSignature", "dbCompiledOnVersion", "dbCompiledLang", "dbIsCompiled", "dbCompiledCount"}
            for _, k in ipairs(globalMetadata) do
                if Questie.db.global[k] then
                    Questie.dbCache.global[k] = Questie.db.global[k]
                    Questie.db.global[k] = nil
                end
            end
        end
    end,
    [7] = function()
        -- Offload Journey history to its own SavedVariable
        if Questie.dbJourney and Questie.dbJourney.char then
            if Questie.db.char and Questie.db.char.journey and (table.getn(Questie.db.char.journey) > 0) then
                Questie:Debug(Questie.DEBUG_INFO, "[Migration] Offloading Journey history to separate SavedVariable...")
                Questie.dbJourney.char.journey = Questie.db.char.journey
                Questie.db.char.journey = nil
            end
        end
        -- Final cleanup of old learnedData from main config if still present
        if Questie.db and Questie.db.global and Questie.db.global.learnedData then
             Questie.db.global.learnedData = nil
        end
    end,
    [8] = function()
        -- The "ElvUI style tooltips" option shipped enabled by default, which made Questie
        -- restyle every default WoW tooltip (stripping the border) for users who never asked
        -- for it (#16). It is now opt-in (default false). Reset it off once so existing installs
        -- get their default tooltips back; users who want the flat style can re-enable it.
        Questie.db.profile.elvuiStyleTooltips = false
    end
}

function Migration:Migrate()
    if not Questie.db.profile.migrationVersion then
        Questie.db.profile.migrationVersion = 0
    end

    local currentVersion = Questie.db.profile.migrationVersion
    local targetVersion = table.getn(migrationFunctions)

    if currentVersion == targetVersion then
        Questie:Debug(Questie.DEBUG_DEVELOP, "[Migration] Nothing to migrate. Already on latest version:", targetVersion)
        return
    end

    Questie:Debug(Questie.DEBUG_DEVELOP, "[Migration] Starting Questie migration for targetVersion", targetVersion)

    while currentVersion < targetVersion do
        currentVersion = currentVersion + 1
        migrationFunctions[currentVersion]()
    end

    Questie.db.profile.migrationVersion = currentVersion
end