local M = {}
local api, fn = vim.api, vim.fn

local win_title = fn.has('nvim-0.9') == 1 and {
        { '',       'TransTitleRound' },
        { ' Trans', 'TransTitle' },
        { '',       'TransTitleRound' },
    } or nil

M.conf = {
    view = {
        i = 'float',
        n = 'hover',
        v = 'hover',
    },
    hover = {
        width = 37,
        height = 27,
        border = 'rounded',
        title = win_title,
        keymap = {
            pageup = '[[',
            pagedown = ']]',
            pin = '<leader>[',
            close = '<leader>]',
            toggle_entry = '<leader>;',
            play = '_',
        },
        animation = {
            -- open = 'fold',
            -- close = 'fold',
            open = 'slid',
            close = 'slid',
            interval = 12,
        },
        auto_close_events = {
            'InsertEnter',
            'CursorMoved',
            'BufLeave',
        },
        auto_play = true,
        timeout = 2000,
        spinner = 'dots', -- 查看所有样式: /lua/Trans/util/spinner
        -- spinner = 'moon'
    },
    float = {
        width = 0.8,
        height = 0.8,
        border = 'rounded',
        title = win_title,
        keymap = {
            quit = 'q',
        },
        animation = {
            open = 'fold',
            close = 'fold',
            interval = 10,
        },
        tag = {
            wait = '#519aba',
            fail = '#e46876',
            success = '#10b981',
        },
    },
    order = { -- only work on hover mode
        'title',
        'tag',
        'pos',
        'exchange',
        'translation',
        'definition',
    },
    icon = {
        star = '',
        notfound = ' ',
        yes = '✔',
        no = '',
        -- --- char: ■ | □ | ▇ | ▏ ▎ ▍ ▌ ▋ ▊ ▉ █
        -- --- ◖■■■■■■■◗▫◻ ▆ ▆ ▇⃞ ▉⃞
        cell = '■',
        -- star = '⭐',
        -- notfound = '❔',
        -- yes = '✔️',
        -- no = '❌'
    },
    theme = 'default',
    db_path = '$HOME/.vim/dict/ultimate.db',
}

M.setup = function(opts)
    if opts then
        M.conf = vim.tbl_deep_extend('force', M.conf, opts)
    end
    local conf   = M.conf

    local set_hl = api.nvim_set_hl
    local hls    = require('Trans.style.theme')[conf.theme]
    for hl, opt in pairs(hls) do
        set_hl(0, hl, opt)
    end
end

local function get_select()
    local _start = fn.getpos("v")
    local _end = fn.getpos('.')

    if _start[2] > _end[2] or (_start[3] > _end[3] and _start[2] == _end[2]) then
        _start, _end = _end, _start
    end
    local s_row, s_col = _start[2], _start[3]
    local e_row, e_col = _end[2], _end[3]

    -- print(s_row, e_row, s_col, e_col)
    ---@type string
    ---@diagnostic disable-next-line: assign-type-mismatch
    local line = fn.getline(e_row)
    local uidx = vim.str_utfindex(line, math.min(#line, e_col))
    e_col = vim.str_byteindex(line, uidx)


    if s_row == e_row then
        return line:sub(s_col, e_col)
    else
        local lines = fn.getline(s_row, e_row)
        local e = #lines
        lines[1] = lines[1]:sub(s_col)
        lines[e] = line:sub(1, e_col)
        return table.concat(lines)
    end
end

M.get_str = function(mode)
    local word
    if mode == 'n' then
        word = fn.expand('<cword>')
    elseif mode == 'v' then
        api.nvim_input('<ESC>')
        word = get_select()
    elseif mode == 'i' then
        -- TODO Use Telescope with fuzzy finder
        ---@diagnostic disable-next-line: param-type-mismatch
        word = fn.input('请输入需要查询的单词:')
    else
        error('invalid mode: ' .. mode)
    end
    return word
end


local process
process = function(opts)
    opts = opts or {}
    local mode = opts.mode or vim.api.nvim_get_mode().mode
    local str = M.get_str(mode)
    if str == '' then return end

    local view = opts.view or M.conf.view[mode]
    local res = require('Trans.backend').offline.query(str)
    vim.pretty_print(res)

    M.translate = coroutine.wrap(process)
end

M.translate = coroutine.wrap(process)


---Pasue Handler for {ms} milliseconds
---@param ms number @milliseconds
M.pause = function(ms)
    local co = coroutine.running()
    vim.defer_fn(function()
        coroutine.resume(co)
    end, ms)
    coroutine.yield()
end


-- local title = {
--     "████████╗██████╗  █████╗ ███╗   ██╗███████╗",
--     "╚══██╔══╝██╔══██╗██╔══██╗████╗  ██║██╔════╝",
--     "   ██║   ██████╔╝███████║██╔██╗ ██║███████╗",
--     "   ██║   ██╔══██╗██╔══██║██║╚██╗██║╚════██║",
--     "   ██║   ██║  ██║██║  ██║██║ ╚████║███████║",
--     "   ╚═╝   ╚═╝  ╚═╝╚═╝  ╚═╝╚═╝  ╚═══╝╚══════╝",
--}

-- string.width = api.nvim_strwidth
-- string.isEn = function(self)
--     local char = { self:byte(1, -1) }
--     for i = 1, #self do
--         if char[i] > 128 then
--             return false
--         end
--     end
--     return true
-- end

-- string.play = fn.has('linux') == 1 and function(self)
--         local cmd = ([[echo "%s" | festival --tts]]):format(self)
--         fn.jobstart(cmd)
--     end or function(self)
--         local seperator = fn.has('unix') and '/' or '\\'
--         local file = debug.getinfo(1, "S").source:sub(2):match('(.*)lua') .. seperator .. 'tts' .. seperator .. 'say.js'
--         fn.jobstart('node ' .. file .. ' ' .. self)
--     end
M.ns = api.nvim_create_namespace('Trans')

return M