-- AltSystem Data Definitions
-- Contains skill data (fetched from TRP3 profile), item options, defense options, and modifier constants.

AltSystem = AltSystem or {}
AltSystem.Data = {}

-- Skill levels and their modifiers
AltSystem.Data.SkillLevels = {
    ["Inept"]   = -4,
    ["Novice"]  = -2,
    ["Adept"]   =  0,
    ["Expert"]  =  2,
    ["Master"]  =  4,
}

-- The "Base roll" entry is always the first (default) skill
local BASE_ROLL_ENTRY    = { name = "Base roll",  level = "Base",     modifier =  0 }
-- The "Unskilled" entry is always the last skill
local UNSKILLED_ENTRY   = { name = "Unskilled",  level = "Unskilled", modifier = -4 }

-- Default/fallback skill list used when no TRP3 profile skills are found
local DEFAULT_SKILLS = {
    { name = "Base roll",     level = "Base",       modifier =  0 },
    { name = "Novice Skill",  level = "Novice",     modifier = -2 },
    { name = "Adept Skill",   level = "Adept",      modifier =  0 },
    { name = "Expert Skill",  level = "Expert",     modifier =  2 },
    { name = "Master Skill",  level = "Master",     modifier =  4 },
    { name = "Unskilled",     level = "Unskilled",  modifier = -4 },
}

-- Valid skill level keywords that must appear in the trait's right field (RT)
local VALID_SKILL_KEYWORDS = { "Inept", "Novice", "Adept", "Expert", "Master" }

-- Expected numeric value ranges for each skill keyword
local SKILL_KEYWORD_RANGES = {
    ["Novice"]  = { min = 1,  max = 5 },
    ["Adept"]   = { min = 6,  max = 10 },
    ["Expert"]  = { min = 11, max = 19 },
    ["Master"]  = { min = 20, max = 20 },
}

-- Check if the trait's right text field contains a valid skill keyword.
-- Returns the matched keyword if found, nil otherwise.
local function FindSkillKeyword(rightText)
    if not rightText or rightText == "" then return nil end
    for _, keyword in ipairs(VALID_SKILL_KEYWORDS) do
        if rightText:find(keyword) then
            return keyword
        end
    end
    return nil
end

-- Check whether the numeric value matches the expected range for the given keyword.
-- Returns a warning string if mismatched, or nil if everything is fine.
local function CheckSkillMismatch(keyword, numericValue)
    if not keyword or keyword == "Inept" then return nil end
    local range = SKILL_KEYWORD_RANGES[keyword]
    if not range then return nil end
    if not numericValue or numericValue <= 0 then return nil end
    if numericValue < range.min or numericValue > range.max then
        return "Skill is marked as " .. keyword .. " (" .. range.min .. "-" .. range.max .. "), but the profile has a value of " .. numericValue .. "."
    end
    return nil
end

-- Determine the skill level from the trait's right text and numeric value (V2 field, 0-20 range).
-- If the trait is marked as Inept, always returns "Inept" with -4 modifier regardless of numeric value.
-- Otherwise returns the level string and modifier based on numeric value, or nil if the value is 0 or absent.
local function ParseSkillLevel(rightText, numericValue)
    if rightText and rightText:find("Inept") then
        return "Inept", AltSystem.Data.SkillLevels["Inept"]
    end
    if not numericValue or numericValue <= 0 then return nil, nil end
    if numericValue >= 20 then
        return "Master", AltSystem.Data.SkillLevels["Master"]
    elseif numericValue >= 11 then
        return "Expert", AltSystem.Data.SkillLevels["Expert"]
    elseif numericValue >= 6 then
        return "Adept", AltSystem.Data.SkillLevels["Adept"]
    else
        return "Novice", AltSystem.Data.SkillLevels["Novice"]
    end
end

-- Fetch skills from the current TRP3 profile's personality traits.
-- Returns an array of skill entries, always starting with "Base roll".
-- Traits marked as Inept get a -4 modifier regardless of their numeric value.
-- Falls back to the default list if no profile or no valid skills are found.
function AltSystem.Data:RefreshSkills()
    local skills = {}
    -- Always add Base roll as the first entry
    table.insert(skills, { name = BASE_ROLL_ENTRY.name, level = BASE_ROLL_ENTRY.level, modifier = BASE_ROLL_ENTRY.modifier })

    local foundAny = false

    -- Try to read personality traits from the active TRP3 profile
    if TRP3_API and TRP3_API.profile and TRP3_API.profile.getData then
        local ok, characteristics = pcall(TRP3_API.profile.getData, "player/characteristics")
        if ok and characteristics and characteristics.PS then
            for _, trait in ipairs(characteristics.PS) do
                local skillName = trait.LT
                local numericValue = trait.V2

                local keyword = FindSkillKeyword(trait.RT)
                if skillName and skillName ~= "" and keyword then
                    local level, modifier = ParseSkillLevel(trait.RT, numericValue)
                    if level and modifier then
                        foundAny = true
                        table.insert(skills, {
                            name     = skillName,
                            level    = level,
                            modifier = modifier,
                            warning  = CheckSkillMismatch(keyword, numericValue),
                        })
                    end
                end
            end
        end
    end

    -- If no valid skills were found, use the default fallback list
    if not foundAny then
        skills = {}
        for _, skill in ipairs(DEFAULT_SKILLS) do
            table.insert(skills, { name = skill.name, level = skill.level, modifier = skill.modifier })
        end
    end

    -- Always add Unskilled as the last entry
    table.insert(skills, { name = UNSKILLED_ENTRY.name, level = UNSKILLED_ENTRY.level, modifier = UNSKILLED_ENTRY.modifier })

    AltSystem.Data.Skills = skills
    return skills
end

-- Initialize with the default skill list
AltSystem.Data.Skills = {}
for _, skill in ipairs(DEFAULT_SKILLS) do
    table.insert(AltSystem.Data.Skills, { name = skill.name, level = skill.level, modifier = skill.modifier })
end

-- Item options: name and modifier (first entry = no item)
AltSystem.Data.Items = {
    { name = "No item",   modifier = 0 },
    { name = "Rare item", modifier = 3 },
    { name = "Epic item", modifier = 5 },
}

-- Defense options: name and modifier
AltSystem.Data.Defenses = {
    { name = "Base armor",        modifier = 0 },
    { name = "Extra small armor", modifier = 1 },
    { name = "Extra large armor", modifier = 2 },
}

-- Shield modifier
AltSystem.Data.ShieldModifier = 1