--=============================================================================
-- installer.lua
-- Copyright 2025 Eric Wong
-- Author: Eric Wong < wsdjeg@outlook.com >
-- License: GPLv3
--=============================================================================

local M = {}

local H = {}

local job = require('spacevim.api.job')
local notify = require('spacevim.api.notify')
local jobs = {}
local config = require('plug.config')
local loader = require('plug.loader')

local on_uidate

--- @class PlugUiData
--- @field command? string clone/pull/build/curl
--- @filed clone_process? string
--- @filed clone_done? boolean
--- @filed building? boolean
--- @filed build_done? boolean
--- @field pull_done? boolean
--- @field pull_process? string
--- @field curl_done? boolean

if config.ui == 'default' then
  on_uidate = require('plug.ui').on_update
elseif config.ui == 'notify' then
  on_uidate = function(name, date) end
end

local processes = 0

local installation_queue = {}
local building_queue = {}
local updating_queue = {}
local raw_download_queue = {}

--- @param plugSpec PluginSpec
function H.build(plugSpec)
  if processes >= config.max_processes then
    table.insert(building_queue, plugSpec)
    return
  end
  on_uidate(plugSpec.name, { command = 'build' })
  local jobid = job.start(plugSpec.build, {
    on_stdout = function(id, data)
      for _, v in ipairs(data) do
        notify.notify(jobs['jobid_' .. id .. ':' .. v])
      end
    end,
    on_stderr = function(id, data)
      for _, v in ipairs(data) do
        notify.notify(jobs['jobid_' .. id .. ':' .. v])
      end
    end,
    on_exit = function(id, data, single)
      if data == 0 and single == 0 then
        on_uidate(plugSpec.name, { build_done = true })
        if plugSpec.autoload then
          loader.load(plugSpec)
        end
      else
        on_uidate(plugSpec.name, { build_done = false })
      end
      processes = processes - 1
      if #building_queue > 0 then
        H.build(table.remove(building_queue))
      end
    end,
    cwd = plugSpec.path,
  })
  if jobid > 0 then
    processes = processes + 1
    jobs['jobid_' .. jobid] = plugSpec.name
  else
    on_uidate(plugSpec.name, { build_done = false })
  end
end

--- @param plugSpec PluginSpec
function H.download_raw(plugSpec, force)
  if processes >= config.max_processes then
    table.insert(raw_download_queue, plugSpec)
    return
  elseif vim.fn.filereadable(plugSpec.path) == 1 and not force then
    on_uidate(plugSpec.name, { command = 'curl', curl_done = true })
    return
  end

  local cmd = { 'curl', '-fLo', plugSpec.path, '--create-dirs', plugSpec.url }
  on_uidate(plugSpec.name, { command = 'curl' })
  local jobid = job.start(cmd, {
    on_exit = function(id, data, single)
      if data == 0 and single == 0 then
        on_uidate(plugSpec.name, { curl_done = true })
      else
        on_uidate(plugSpec.name, { curl_done = false })
      end
      processes = processes - 1
      if #installation_queue > 0 then
        H.install_plugin(table.remove(installation_queue, 1))
      elseif #building_queue > 0 then
        H.build(table.remove(building_queue, 1))
      end
    end,
    env = {
      http_proxy = config.http_proxy,
      https_proxy = config.https_proxy,
    },
  })
  processes = processes + 1
  jobs['jobid_' .. jobid] = plugSpec.name
end

--- @param plugSpec PluginSpec
function H.install_plugin(plugSpec)
  if processes >= config.max_processes then
    table.insert(installation_queue, plugSpec)
    return
  elseif vim.fn.isdirectory(plugSpec.path) == 1 then
    -- if the directory exists, skip installation
    on_uidate(plugSpec.name, { command = 'clone', clone_done = true })
    return
  end
  local cmd = { 'git', 'clone', '--progress' }
  if config.clone_depth ~= 0 then
    table.insert(cmd, '--depth')
    table.insert(cmd, tostring(config.clone_depth))
  end
  if plugSpec.branch then
    table.insert(cmd, '--branch')
    table.insert(cmd, plugSpec.branch)
  elseif plugSpec.tag then
    table.insert(cmd, '--branch')
    table.insert(cmd, plugSpec.tag)
  end

  table.insert(cmd, plugSpec.url)
  table.insert(cmd, plugSpec.path)
  on_uidate(plugSpec.name, { command = 'clone', clone_process = '' })
  local jobid = job.start(cmd, {
    on_stderr = function(id, data)
      for _, v in ipairs(data) do
        local status = vim.fn.matchstr(v, [[\d\+%\s(\d\+/\d\+)]])
        if vim.fn.empty(status) == 0 then
          on_uidate(plugSpec.name, { clone_process = status })
        end
      end
    end,
    on_exit = function(id, data, single)
      if data == 0 and single == 0 then
        on_uidate(plugSpec.name, { clone_done = true, download_process = 100 })
        if plugSpec.build then
          H.build(plugSpec)
        elseif plugSpec.autoload then
          loader.load(plugSpec)
        end
      else
        on_uidate(plugSpec.name, { clone_done = false, download_process = 0 })
      end
      processes = processes - 1
      if #installation_queue > 0 then
        H.install_plugin(table.remove(installation_queue, 1))
      elseif #building_queue > 0 then
        H.build(table.remove(building_queue, 1))
      end
    end,
    env = {
      http_proxy = config.http_proxy,
      https_proxy = config.https_proxy,
    },
  })
  processes = processes + 1
  jobs['jobid_' .. jobid] = plugSpec.name
end

--- @param plugSpec PluginSpec
function H.update_plugin(plugSpec, force)
  if processes >= config.max_processes then
    table.insert(updating_queue, { plugSpec, force })
    return
  elseif vim.fn.isdirectory(plugSpec.path) ~= 1 then
    -- if the directory does not exist, return failed
    on_uidate(plugSpec.name, { command = 'pull', pull_done = false })
    return
  elseif plugSpec.frozen and not force then
    on_uidate(plugSpec.name, { command = 'pull', pull_done = true })
    return
  end
  local cmd = { 'git', 'pull', '--progress' }
  on_uidate(plugSpec.name, { command = 'pull', pull_process = '' })
  local jobid = job.start(cmd, {
    on_stderr = function(id, data)
      for _, v in ipairs(data) do
        local status = vim.fn.matchstr(v, [[\d\+%\s(\d\+/\d\+)]])
        if vim.fn.empty(status) == 0 then
          on_uidate(plugSpec.name, { pull_process = status })
        end
      end
    end,
    on_exit = function(id, data, single)
      if data == 0 and single == 0 then
        on_uidate(plugSpec.name, { pull_done = true })
        if plugSpec.build then
          H.build(plugSpec)
        end
      else
        on_uidate(plugSpec.name, { pull_done = false })
      end
      processes = processes - 1
      if #updating_queue > 0 then
        H.update_plugin(unpack(table.remove(updating_queue, 1)))
      elseif #building_queue > 0 then
        H.build(table.remove(building_queue, 1))
      end
    end,
    cwd = plugSpec.path,
    env = {
      http_proxy = config.http_proxy,
      https_proxy = config.https_proxy,
    },
  })
  if jobid > 0 then
    processes = processes + 1
    jobs['jobid_' .. jobid] = plugSpec.name
  else
    on_uidate(plugSpec.name, { pull_done = false })
  end
end

M.install = function(plugSpecs)
  for _, v in ipairs(plugSpecs) do
    if v.is_local then
      on_uidate(v.name, {is_local = true})
    elseif v.type == 'raw' then
      H.download_raw(v)
    else
      H.install_plugin(v)
    end
  end
end

M.update = function(plugSpecs, force)
  for _, v in ipairs(plugSpecs) do
    if v.is_local then
      on_uidate(v.name, {is_local = true})
    elseif v.type == 'raw' then
      H.download_raw(v, force)
    else
      H.update_plugin(v, force)
    end
  end
end

return M