" ============================================================================
" File:        wakatime.vim
" Description: Automatic time tracking for Vim.
" Maintainer:  Wakati.Me <support@wakatime.com>
" Version:     0.1.3
" ============================================================================


" Init {{{

    " Check Vim version
    if v:version < 700
        echoerr "This plugin requires vim >= 7."
        finish
    endif

    " Check for Python support
    if !has('python')
        echoerr "This plugin requires Vim to be compiled with Python support."
        finish
    endif

    " Check for required user-defined settings
    if !exists("g:wakatime_api_key")
        if filereadable(expand("$HOME/.wakatime"))
            for s:line in readfile(expand("$HOME/.wakatime"))
                let s:setting = split(s:line, "=")
                if s:setting[0] == "api_key"
                    let g:wakatime_api_key = s:setting[1]
                endif
            endfor
        endif
        if !exists("g:wakatime_api_key")
            finish
        endif
    endif

    " Only load plugin once
    if exists("g:loaded_wakatime")
        finish
    endif
    let g:loaded_wakatime = 1

    " Backup & Override cpoptions
    let s:old_cpo = &cpo
    set cpo&vim

    let s:plugin_directory = expand("<sfile>:p:h")

    " Set default updatetime
    if !exists("g:wakatime_updatetime")
        let g:wakatime_updatetime = 15 " 15 minutes
    endif

    " We are not away until getting a CursorHold event
    let s:away_start = 0

    " Create logfile if does not exist
    exec "silent !touch ~/.wakatime.log"

    python import time
    python import time
    python import uuid
    python import vim
    python instance_id = str(uuid.uuid4())
    python vim.command('let s:instance_id = "%s"' % instance_id)

" }}}


" Function Definitions {{{

    function! s:setUpdateTime()
        if &updatetime < 60 * 1000 * 2
            let &updatetime = g:wakatime_updatetime * 60 * 1000
        endif
    endfunction
    call s:setUpdateTime()

    function! s:GetCurrentFile()
        return expand("%:p")
    endfunction

    function! s:GetCurrentTime()
        python vim.command('let current_time="%f"' % time.time())
        return current_time
    endfunction

    function! s:api(type, task, time)
        if a:task != ''
            exec "silent !python " . s:plugin_directory . "/wakatime.py --key" g:wakatime_api_key "--instance" s:instance_id "--action" a:type "--task" shellescape(a:task) "--time" a:time . " &"
        endif
    endfunction

    function! s:getchar()
        let c = getchar()
        if c =~ '^\d\+$'
          let c = nr2char(c)
        endif
        return c
    endfunction

    function! Wakatime_isAway()
        return s:away_start
    endfunction

    function! s:allServersAway()
        if has('clientserver')
            let servers = split(serverlist())
            for server in servers
                if server != v:servername
                    if !remote_expr(server,'Wakatime_isAway()')
                        return 0
                    endif
                endif
            endfor
        endif
        return 1
    endfunction

" }}}


" Event Handlers {{{

    function! s:bufenter()
        call s:api("open_file", s:GetCurrentFile(), s:GetCurrentTime())
    endfunction

    function! s:bufleave()
        call s:api("close_file", s:GetCurrentFile(), s:GetCurrentTime())
    endfunction

    function! s:vimenter()
        call s:api("open_editor", s:GetCurrentFile(), s:GetCurrentTime())
    endfunction

    function! s:vimleave()
        call s:api("quit_editor", s:GetCurrentFile(), s:GetCurrentTime())
    endfunction

    function! s:bufwrite()
        call s:api("write_file", s:GetCurrentFile(), s:GetCurrentTime())
    endfunction

    function! s:cursorhold()
        let s:away_task = s:GetCurrentFile()
        python vim.command("let s:away_start=%f" % (time.time() - (float(vim.eval("&updatetime")) / 1000.0)))
        autocmd Wakatime CursorMoved,CursorMovedI * call s:cursormoved()
    endfunction

    function! s:cursormoved()
        autocmd! Wakatime CursorMoved,CursorMovedI *

        " Don't do anything unless all other Vim instances are also away
        if !s:allServersAway()
            let s:away_start = 0
            call s:api("ping", s:away_task, s:GetCurrentTime())
            return
        endif

        python vim.command("let away_end=%f" % time.time())
        let away_unit = "minutes"
        let away_duration = (away_end - s:away_start) / 60
        if away_duration < 2
            call s:setUpdateTime()
            return
        endif
        if away_duration > 59
            let away_duration = away_duration / 60
            let away_unit = "hours"
        endif
        if away_duration > 59
            let away_duration = away_duration / 60
            let away_unit = "days"
        endif
        let answer = input(printf("You were away %.f %s. Add time to current file? (y/n)", away_duration, away_unit))
        if answer != "y"
            call s:api("minimize_editor", s:away_task, printf("%f", s:away_start))
            call s:api("maximize_editor", s:away_task, printf("%f", away_end))
        else
            call s:api("ping", s:away_task, s:GetCurrentTime())
        endif
        let s:away_start = 0
        "redraw!
    endfunction

" }}}


" Autocommand Events {{{

    augroup Wakatime
        autocmd!
        autocmd BufEnter * call s:bufenter()
        autocmd BufLeave * call s:bufleave()
        autocmd VimEnter * call s:vimenter()
        autocmd VimLeave * call s:vimleave()
        autocmd BufWritePost * call s:bufwrite()
        autocmd CursorHold,CursorHoldI * call s:cursorhold()
    augroup END

" }}}


" Restore cpoptions
let &cpo = s:old_cpo