local actions = require "telescope.actions"
local action_set = require "telescope.actions.set"

local transform_mod = require("telescope.actions.mt").transform_mod

local eq = assert.are.same

describe("actions", function()
  it("should allow creating custom actions", function()
    local a = transform_mod {
      x = function()
        return 5
      end,
    }

    eq(5, a.x())
  end)

  it("allows adding actions", function()
    local a = transform_mod {
      x = function()
        return "x"
      end,
      y = function()
        return "y"
      end,
    }

    local x_plus_y = a.x + a.y

    eq({ "x", "y" }, { x_plus_y() })
  end)

  it("ignores nils from added actions", function()
    local a = transform_mod {
      x = function()
        return "x"
      end,
      y = function()
        return "y"
      end,
      nil_maker = function()
        return nil
      end,
    }

    local x_plus_y = a.x + a.nil_maker + a.y

    eq({ "x", "y" }, { x_plus_y() })
  end)

  it("allows overriding an action", function()
    local a = transform_mod {
      x = function()
        return "x"
      end,
      y = function()
        return "y"
      end,
    }

    -- actions.file_goto_selection_edit:replace(...)
    a.x:replace(function()
      return "foo"
    end)
    eq("foo", a.x())

    a._clear()
    eq("x", a.x())
  end)

  it("allows overriding an action only in specific cases with if", function()
    local a = transform_mod {
      x = function(e)
        return e * 10
      end,
      y = function()
        return "y"
      end,
    }

    -- actions.file_goto_selection_edit:replace(...)
    a.x:replace_if(function(e)
      return e > 0
    end, function(e)
      return (e / 10)
    end)
    eq(-100, a.x(-10))
    eq(10, a.x(100))
    eq(1, a.x(10))

    a._clear()
    eq(100, a.x(10))
  end)

  it("allows overriding an action only in specific cases with mod", function()
    local a = transform_mod {
      x = function(e)
        return e * 10
      end,
      y = function()
        return "y"
      end,
    }

    -- actions.file_goto_selection_edit:replace(...)
    a.x:replace_map {
      [function(e)
        return e > 0
      end] = function(e)
        return (e / 10)
      end,
      [function(e)
        return e == 0
      end] = function(e)
        return (e + 10)
      end,
    }

    eq(-100, a.x(-10))
    eq(10, a.x(100))
    eq(1, a.x(10))
    eq(10, a.x(0))

    a._clear()
    eq(100, a.x(10))
  end)

  it("continuous replacement", function()
    local a = transform_mod {
      x = function()
        return "cleared"
      end,
      y = function()
        return "y"
      end,
    }

    -- Replace original, which becomes new fallback
    a.x:replace(function()
      return "negative"
    end)

    -- actions.file_goto_selection_edit:replace(...)
    a.x:replace_map {
      [function(e)
        return e > 0
      end] = function(e)
        return "positive"
      end,
      [function(e)
        return e == 0
      end] = function(e)
        return "zero"
      end,
    }

    eq("positive", a.x(10))
    eq("zero", a.x(0))
    eq("negative", a.x(-10))

    a._clear()
    eq("cleared", a.x(10))
  end)

  it("enhance.pre", function()
    local a = transform_mod {
      x = function()
        return "x"
      end,
      y = function()
        return "y"
      end,
    }

    local called_pre = false

    a.y:enhance {
      pre = function()
        called_pre = true
      end,
    }
    eq("y", a.y())
    eq(true, called_pre)
  end)

  it("enhance.post", function()
    local a = transform_mod {
      x = function()
        return "x"
      end,
      y = function()
        return "y"
      end,
    }

    local called_post = false

    a.y:enhance {
      post = function()
        called_post = true
      end,
    }
    eq("y", a.y())
    eq(true, called_post)
  end)

  it("static_pre static_post", function()
    local called_pre = false
    local called_post = false
    local static_post = 0
    local a = transform_mod {
      x = {
        pre = function()
          called_pre = true
        end,
        action = function()
          return "x"
        end,
        post = function()
          called_post = true
        end,
      },
    }

    eq("x", a.x())
    eq(true, called_pre)
    eq(true, called_post)
  end)

  it("can call both", function()
    local a = transform_mod {
      x = function()
        return "x"
      end,
      y = function()
        return "y"
      end,
    }

    local called_count = 0
    local count_inc = function()
      called_count = called_count + 1
    end

    a.y:enhance {
      pre = count_inc,
      post = count_inc,
    }

    eq("y", a.y())
    eq(2, called_count)
  end)

  it("can call both even when combined", function()
    local a = transform_mod {
      x = function()
        return "x"
      end,
      y = function()
        return "y"
      end,
    }

    local called_count = 0
    local count_inc = function()
      called_count = called_count + 1
    end

    a.y:enhance {
      pre = count_inc,
      post = count_inc,
    }

    a.x:enhance {
      post = count_inc,
    }

    local x_plus_y = a.x + a.y
    x_plus_y()

    eq(3, called_count)
  end)

  it(
    "can call replace fn even when combined before replace registered the fn (because that happens with mappings)",
    function()
      local a = transform_mod {
        x = function()
          return "x"
        end,
        y = function()
          return "y"
        end,
      }

      local called_count = 0
      local count_inc = function()
        called_count = called_count + 1
      end

      local x_plus_y = a.x + a.y
      a.x:replace(function()
        count_inc()
      end)
      a.y:replace(function()
        count_inc()
      end)

      x_plus_y()

      eq(2, called_count)
    end
  )

  it(
    "can call enhance fn even when combined before enhance registed fns (because that happens with mappings)",
    function()
      local a = transform_mod {
        x = function()
          return "x"
        end,
        y = function()
          return "y"
        end,
      }

      local called_count = 0
      local count_inc = function()
        called_count = called_count + 1
      end

      local x_plus_y = a.x + a.y
      a.y:enhance {
        pre = count_inc,
        post = count_inc,
      }

      a.x:enhance {
        post = count_inc,
      }

      x_plus_y()

      eq(3, called_count)
    end
  )

  it("clears enhance", function()
    local a = transform_mod {
      x = function()
        return "x"
      end,
      y = function()
        return "y"
      end,
    }

    local called_post = false

    a.y:enhance {
      post = function()
        called_post = true
      end,
    }

    a._clear()

    eq("y", a.y())
    eq(false, called_post)
  end)

  it("handles passing arguments", function()
    local a = transform_mod {
      x = function(bufnr)
        return string.format "bufnr: %s"
      end,
    }

    a.x:replace(function(bufnr)
      return string.format("modified: %s", bufnr)
    end)
    eq("modified: 5", a.x(5))
  end)

  it("handles add with two different tables", function()
    local count_a = 0
    local count_b = 0
    local a = transform_mod {
      x = function()
        count_a = count_a + 1
      end,
    }
    local b = transform_mod {
      y = function()
        count_b = count_b + 1
      end,
    }

    local called_count = 0
    local count_inc = function()
      called_count = called_count + 1
    end

    a.x:enhance {
      post = count_inc,
    }
    b.y:enhance {
      post = count_inc,
    }

    local x_plus_y = a.x + b.y
    x_plus_y()

    eq(2, called_count)
    eq(1, count_a)
    eq(1, count_b)
  end)

  it("handles tripple concat with static pre post", function()
    local count_a = 0
    local count_b = 0
    local count_c = 0
    local static_pre = 0
    local static_post = 0
    local a = transform_mod {
      x = {
        pre = function()
          static_pre = static_pre + 1
        end,
        action = function()
          count_a = count_a + 1
        end,
        post = function()
          static_post = static_post + 1
        end,
      },
    }
    local b = transform_mod {
      y = {
        pre = function()
          static_pre = static_pre + 1
        end,
        action = function()
          count_b = count_b + 1
        end,
        post = function()
          static_post = static_post + 1
        end,
      },
    }
    local c = transform_mod {
      z = {
        pre = function()
          static_pre = static_pre + 1
        end,
        action = function()
          count_c = count_c + 1
        end,
        post = function()
          static_post = static_post + 1
        end,
      },
    }

    local replace_count = 0
    a.x:replace(function()
      replace_count = replace_count + 1
    end)

    local x_plus_y_plus_z = a.x + b.y + c.z
    x_plus_y_plus_z()

    eq(0, count_a)
    eq(1, count_b)
    eq(1, count_c)
    eq(1, replace_count)
    eq(3, static_pre)
    eq(3, static_post)
  end)

  describe("action_set", function()
    it("can replace `action_set.edit`", function()
      action_set.edit:replace(function(_, arg)
        return "replaced:" .. arg
      end)
      eq("replaced:edit", actions.file_edit())
      eq("replaced:vnew", actions.file_vsplit())
    end)

    it("handles backwards compat with select and edit files", function()
      -- Reproduce steps:
      --  In config, we have { ["<CR>"] = actions.select, ... }
      --  In caller, we have actions._goto:replace(...)
      --  Person calls `select`, does not see update
      action_set.edit:replace(function(_, arg)
        return "default_to_edit:" .. arg
      end)
      eq("default_to_edit:edit", actions.select_default())

      action_set.select:replace(function(_, arg)
        return "override_with_select:" .. arg
      end)
      eq("override_with_select:default", actions.select_default())

      -- Sometimes you might want to change the default selection...
      --  but you don't want to prohibit the ability to edit the code...
    end)
  end)
end)