local guide = require 'parser.guide'
local util  = require 'utility'

local m = {}

--- 获取 position 对应的光标位置
---@param lines table
---@param text string
---@param position position
---@return integer
function m.offset(lines, text, position)
    local row    = position.line + 1
    local start  = guide.lineRange(lines, row)
    if start <= 0 or start > #text then
        return #text + 1
    end
    local offset = utf8.offset(text, position.character + 1, start) or (#text + 1)
    return offset - 1
end

--- 获取 position 对应的光标位置(根据附近的单词)
---@param lines table
---@param text string
---@param position position
---@return integer
function m.offsetOfWord(lines, text, position)
    local row    = position.line + 1
    local start  = guide.lineRange(lines, row)
    if start <= 0 or start > #text then
        return #text + 1
    end
    local offset = utf8.offset(text, position.character + 1, start) or (#text + 1)
    if offset > #text
    or text:sub(offset-1, offset):match '[%w_][^%w_]' then
        offset = offset - 1
    end
    return offset
end

--- 将光标位置转化为 position
---@alias position table
---@param lines table
---@param text string
---@param offset integer
---@return position
function m.position(lines, text, offset)
    local row, col      = guide.positionOf(lines, offset)
    local start, finish = guide.lineRange(lines, row, true)
    if start < 1 then
        start = 1
    end
    if col <= finish - start + 1 then
        local ucol     = util.utf8Len(text, start, start + col - 1)
        if row < 1 then
            row = 1
        end
        return {
            line      = row - 1,
            character = ucol,
        }
    elseif col == 1 then
        return {
            line      = row - 1,
            character = 0,
        }
    else
        return {
            line      = row,
            character = 0,
        }
    end
end

--- 将起点与终点位置转化为 range
---@alias range table
---@param lines table
---@param text string
---@param offset1 integer
---@param offset2 integer
function m.range(lines, text, offset1, offset2)
    local range = {
        start   = m.position(lines, text, offset1),
        ['end'] = m.position(lines, text, offset2),
    }
    if range.start.character > 0 then
        range.start.character = range.start.character - 1
    end
    return range
end

--- convert `range` to `offsetStart` and `offsetFinish`
function m.unrange(lines, text, range)
    local start  = m.offset(lines, text, range.start)
    local finish = m.offset(lines, text, range['end'])
    return start, finish
end

---@alias location table
---@param uri string
---@param range range
---@return location
function m.location(uri, range)
    return {
        uri   = uri,
        range = range,
    }
end

---@alias locationLink table
---@param uri string
---@param range range
---@param selection range
---@param origin range
function m.locationLink(uri, range, selection, origin)
    return {
        targetUri            = uri,
        targetRange          = range,
        targetSelectionRange = selection,
        originSelectionRange = origin,
    }
end

function m.textEdit(range, newtext)
    return {
        range   = range,
        newText = newtext,
    }
end

--- 诊断等级
m.DiagnosticSeverity = {
    Error       = 1,
    Warning     = 2,
    Information = 3,
    Hint        = 4,
}

--- 诊断类型与默认等级
m.DiagnosticDefaultSeverity = {
    ['unused-local']            = 'Hint',
    ['unused-function']         = 'Hint',
    ['undefined-global']        = 'Warning',
    ['global-in-nil-env']       = 'Warning',
    ['unused-label']            = 'Hint',
    ['unused-vararg']           = 'Hint',
    ['trailing-space']          = 'Hint',
    ['redefined-local']         = 'Hint',
    ['newline-call']            = 'Information',
    ['newfield-call']           = 'Warning',
    ['redundant-parameter']     = 'Hint',
    ['ambiguity-1']             = 'Warning',
    ['lowercase-global']        = 'Information',
    ['undefined-env-child']     = 'Information',
    ['duplicate-index']         = 'Warning',
    ['empty-block']             = 'Hint',
    ['redundant-value']         = 'Hint',
    ['code-after-break']        = 'Hint',
    ['unbalanced-assignments']  = 'Warning',

    ['duplicate-doc-class']     = 'Warning',
    ['undefined-doc-class']     = 'Warning',
    ['undefined-doc-name']      = 'Warning',
    ['circle-doc-class']        = 'Warning',
    ['undefined-doc-param']     = 'Warning',
    ['duplicate-doc-param']     = 'Warning',
    ['doc-field-no-class']      = 'Warning',
    ['duplicate-doc-field']     = 'Warning',
}

--- 诊断报告标签
m.DiagnosticTag = {
    Unnecessary = 1,
    Deprecated  = 2,
}

m.DocumentHighlightKind = {
    Text  = 1,
    Read  = 2,
    Write = 3,
}

m.MessageType = {
    Error   = 1,
    Warning = 2,
    Info    = 3,
    Log     = 4,
}

m.FileChangeType = {
    Created = 1,
    Changed = 2,
    Deleted = 3,
}

m.CompletionItemKind = {
    Text = 1,
    Method = 2,
    Function = 3,
    Constructor = 4,
    Field = 5,
    Variable = 6,
    Class = 7,
    Interface = 8,
    Module = 9,
    Property = 10,
    Unit = 11,
    Value = 12,
    Enum = 13,
    Keyword = 14,
    Snippet = 15,
    Color = 16,
    File = 17,
    Reference = 18,
    Folder = 19,
    EnumMember = 20,
    Constant = 21,
    Struct = 22,
    Event = 23,
    Operator = 24,
    TypeParameter = 25,
}

m.DiagnosticSeverity = {
    Error       = 1,
    Warning     = 2,
    Information = 3,
    Hint        = 4,
}

m.ErrorCodes = {
    -- Defined by JSON RPC
    ParseError           = -32700,
    InvalidRequest       = -32600,
    MethodNotFound       = -32601,
    InvalidParams        = -32602,
    InternalError        = -32603,
    serverErrorStart     = -32099,
    serverErrorEnd       = -32000,
    ServerNotInitialized = -32002,
    UnknownErrorCode     = -32001,

    -- Defined by the protocol.
    RequestCancelled     = -32800,
}

m.SymbolKind = {
    File = 1,
    Module = 2,
    Namespace = 3,
    Package = 4,
    Class = 5,
    Method = 6,
    Property = 7,
    Field = 8,
    Constructor = 9,
    Enum = 10,
    Interface = 11,
    Function = 12,
    Variable = 13,
    Constant = 14,
    String = 15,
    Number = 16,
    Boolean = 17,
    Array = 18,
    Object = 19,
    Key = 20,
    Null = 21,
    EnumMember = 22,
    Struct = 23,
    Event = 24,
    Operator = 25,
    TypeParameter = 26,
}

m.TokenModifiers = {
    ["declaration"]   = 1 << 0,
    ["documentation"] = 1 << 1,
    ["static"]        = 1 << 2,
    ["abstract"]      = 1 << 3,
    ["deprecated"]    = 1 << 4,
    ["readonly"]      = 1 << 5,
}

m.TokenTypes = {
    ["comment"]       = 0,
    ["keyword"]       = 1,
    ["number"]        = 2,
    ["regexp"]        = 3,
    ["operator"]      = 4,
    ["namespace"]     = 5,
    ["type"]          = 6,
    ["struct"]        = 7,
    ["class"]         = 8,
    ["interface"]     = 9,
    ["enum"]          = 10,
    ["typeParameter"] = 11,
    ["function"]      = 12,
    ["member"]        = 13,
    ["macro"]         = 14,
    ["variable"]      = 15,
    ["parameter"]     = 16,
    ["property"]      = 17,
    ["label"]         = 18,
}


return m