local cd_hooks = require("cd-project.hooks")
local repo = require("cd-project.project-repo")
local utils = require("cd-project.utils")

---@param auto boolean are we auto creating a project?
---@return string|nil
local function find_project_dir()
  local found = vim.fs.find(
    vim.g.cd_project_config.project_dir_pattern,
    { upward = true, stop = vim.loop.os_homedir(), path = vim.fs.dirname(vim.fn.expand("%:p")) }
  )

  if #found == 0 then
    return nil
  end

  local project_dir = vim.fs.dirname(found[1])

  if not project_dir or project_dir == "." or project_dir == "" or project_dir == " " then
    project_dir = string.match(vim.fn.execute("pwd"), "^%s*(.-)%s*$")
  end

  if not project_dir or project_dir == "." or project_dir == "" or project_dir == " " then
    return nil
  end

  return project_dir
end

---@return string[]
local function get_project_paths()
  local projects = repo.get_projects()
  local paths = {}
  for _, value in ipairs(projects) do
    table.insert(paths, value.path)
  end
  return paths
end

---@return string[]
local function get_project_names()
  local projects = repo.get_projects()
  local path_names = {}
  for _, value in ipairs(projects) do
    table.insert(path_names, value.name)
  end
  return path_names
end

---@param path string
local function path_exists_in_tab(path)
  for _, tabpage in ipairs(vim.api.nvim_list_tabpages()) do
    local tab_cwd = vim.fn.getcwd(-1, vim.api.nvim_tabpage_get_number(tabpage))
    local normalized_path = utils.remove_trailing_slash(path)
    local normalized_tab_cwd = utils.remove_trailing_slash(tab_cwd)
    if normalized_path == normalized_tab_cwd then
      return tabpage
    end
  end
  return nil
end

---@param dir string
local function cd_project_in_tab(dir)
  vim.g.cd_project_last_project = vim.g.cd_project_current_project
  vim.g.cd_project_current_project = dir

  local tabnr = path_exists_in_tab(dir)
  if tabnr ~= nil then
    -- Remain in current tab if current tab holds target dir
    if vim.api.nvim_get_current_tabpage() == tabnr then
      vim.notify(
        "Dir already open in current tab (#" .. tabnr .. "). No action taken.",
        vim.log.levels.INFO,
        { title = "cd-project.nvim" }
      )
      return
    end

    -- Switch to tab that holds target dir
    vim.api.nvim_set_current_tabpage(tabnr)
    vim.notify(
      "Dir already open in tab #" .. tabnr .. ". You have been redirected.",
      vim.log.levels.INFO,
      { title = "cd-project.nvim" }
    )
    return
  end

  require("persistence").save()

  if vim.fn.bufnr("Untitled") ~= -1 then
    vim.api.nvim_command("bdelete! Untitled")
  end
  vim.api.nvim_command("%bdelete")

  vim.fn.execute("tabe | tcd " .. vim.fn.fnameescape(dir))
  require("persistence").load()
  local hooks = cd_hooks.get_hooks(vim.g.cd_project_config.hooks, dir, "AFTER_CD")

  for _, hook in ipairs(hooks) do
    hook(dir)
  end
end

---@param dir string
local function cd_project(dir)
  vim.g.cd_project_last_project = vim.g.cd_project_current_project
  vim.g.cd_project_current_project = dir

  require("persistence").save()

  if vim.fn.bufnr("Untitled") ~= -1 then
    vim.api.nvim_command("bdelete! Untitled")
  end
  vim.api.nvim_command("%bdelete")

  vim.fn.execute("cd " .. vim.fn.fnameescape(dir))
  require("persistence").load()

  local hooks = cd_hooks.get_hooks(vim.g.cd_project_config.hooks, dir, "AFTER_CD")
  for _, hook in ipairs(hooks) do
    hook(dir)
  end
end

---@param path string
---@param name? string
---@param desc? string|nil
---@return CdProject.Project|nil
local function build_project_obj(path, name, desc)
  local normalized_path = vim.fn.expand(path)
  if vim.fn.isdirectory(normalized_path) == 0 then
    return utils.log_error(normalized_path .. " is not a directory")
  end

  return {
    path = normalized_path,
    name = name or utils.get_tail_of_path(normalized_path),
    desc = desc,
  }
end

---@param project CdProject.Project
---@param opts? {show_duplicate_hints: boolean}
local function add_project(project, opts)
  local projects = repo.get_projects()
  opts = opts or { show_duplicate_hints = true }

  if vim.tbl_contains(get_project_paths(), project.path) then
    if opts.show_duplicate_hints then
      vim.notify("Project already exists: " .. project.path, vim.log.levels.INFO, { title = "cd-project.nvim" })
    end

    return
  end

  table.insert(projects, project)
  repo.write_projects(projects)
  vim.notify("Project added: \n" .. project.path, vim.log.levels.INFO, { title = "cd-project.nvim" })
end

---@param project CdProject.Project
local function delete_project(project)
  local projects = repo.get_projects()

  local new_projects = vim.tbl_filter(function(p)
    return p.name ~= project.name
  end, projects)
  repo.write_projects(new_projects)
  vim.notify("Project deleted: \n" .. project.name, vim.log.levels.INFO, { title = "cd-project.nvim" })
end

---@param opts? {auto: boolean, show_duplicate_hints: boolean}
local function add_current_project(opts)
  local project_dir = find_project_dir()
  opts = vim.tbl_deep_extend("force", { auto = false, show_duplicate_hints = true }, opts)

  if not project_dir then
    if opts.auto then
      utils.log_info("Can't find project path of current file.\nProject not automatically created.")
      return
    end
    project_dir = vim.fn.getcwd()
  end

  local project = build_project_obj(project_dir)

  if not project then
    return
  end

  add_project(project, opts)
end

local function back()
  local last_project = vim.g.cd_project_last_project
  if not last_project then
    vim.notify("Can't find last project. Haven't switch project yet.")
  end
  cd_project(last_project)
end

return {
  cd_project = cd_project,
  cd_project_in_tab = cd_project_in_tab,
  build_project_obj = build_project_obj,
  get_project_paths = get_project_paths,
  get_project_names = get_project_names,
  add_current_project = add_current_project,
  add_project = add_project,
  delete_project = delete_project,
  back = back,
  find_project_dir = find_project_dir,
}