#!/usr/bin/env python3
# This is a very fragile test. Sorry about that. But interactively entering
# commands and verifying they are recorded correctly in the interactive
# history and that history can be manipulated is inherently difficult.
#
# This is meant to verify just a few of the most basic behaviors of the
# interactive history to hopefully keep regressions from happening. It is not
# meant to be a comprehensive test of the history subsystem. Those types of
# tests belong in the src/fish_tests.cpp module.
#

# The history function might pipe output through the user's pager. We don't
# want something like `less` to complicate matters so force the use of `cat`.
from pexpect_helper import SpawnedProc
import os

os.environ["PAGER"] = "cat"

sp = SpawnedProc(env=os.environ.copy())

send, sendline, sleep, expect_prompt, expect_re, expect_str = (
    sp.send,
    sp.sendline,
    sp.sleep,
    sp.expect_prompt,
    sp.expect_re,
    sp.expect_str,
)
expect_prompt()

# ==========
# Start by ensuring we're not affected by earlier tests. Clear the history.
sendline("builtin history clear")
expect_prompt()

# ==========
# The following tests verify the behavior of the history builtin.
# ==========

# ==========
# List our history which should be empty after just clearing it.
sendline("echo start1; builtin history; echo end1")
expect_prompt("start1\r\nend1\r\n")

# Our history should now contain the previous command and nothing else.
sendline("echo start2; builtin history; echo end2")
expect_prompt("start2\r\necho start1; builtin history; echo end1\r\nend2\r\n")

# ==========
# The following tests verify the behavior of the history function.
# ==========

# ==========
# Verify explicit searching for the first two commands in the previous tests
# returns the expected results.
sendline("history search --reverse 'echo start' | cat")
expect_prompt("echo start1;.*\r\necho start2;")

# ==========
# Verify searching is the implicit action.
sendline("history -p 'echo start'")
expect_prompt("echo start2.*\r\necho start1")

# ==========
# Verify searching with a request for timestamps includes the timestamps.
sendline("history search --show-time='# %F %T%n' --prefix 'echo start'")
expect_prompt(
    "# \d\d\d\d-\d\d-\d\d \d\d:\d\d:\d\d\r\necho start2; .*\r\n# \d\d\d\d-\d\d-\d\d \d\d:\d\d:\d\d\r\necho start1;"
)

# ==========
# Verify explicit searching for an exact command returns just that command.
# returns the expected results.
sendline("echo hello")
expect_prompt()
sendline("echo goodbye")
expect_prompt()
sendline("echo hello again")
expect_prompt()
sendline("echo hello AGAIN")
expect_prompt()

sendline("history search --exact 'echo goodbye' | cat")
expect_prompt("echo goodbye\r\n")

sendline("history search --exact 'echo hello' | cat")
expect_prompt("echo hello\r\n")

# This is slightly subtle in that it shouldn't actually match anything between
# the command we sent and the next prompt.
sendline("history search --exact 'echo hell' | cat")
expect_prompt("history search --exact 'echo hell' | cat\r\n")

# Verify that glob searching works.
sendline("history search --prefix 'echo start*echo end' | cat")
expect_prompt("echo start1; builtin history; echo end1\r\n")

# ==========
# Delete a single command we recently ran.
sendline("history delete -e -C 'echo hello'")
expect_prompt("history delete -e -C 'echo hello'\r\n")
sendline("echo count hello (history search -e -C 'echo hello' | wc -l | string trim)")
expect_prompt("count hello 0\r\n")

# ==========
# Interactively delete one of multiple matched commands. This verifies that we
# delete the first entry matched by the prefix search (the most recent command
# sent above that matches).
sendline("history delete -p 'echo hello'")
expect_re("history delete -p 'echo hello'\r\n")
expect_re("\[1\] echo hello AGAIN\r\n")
expect_re("\[2\] echo hello again\r\n\r\n")
expect_re(
    'Enter nothing to cancel.*\r\nEnter "all" to delete all the matching entries\.\r\n'
)
expect_re("Delete which entries\? >")
sendline("1")
expect_prompt('Deleting history entry 1: "echo hello AGAIN"\r\n')

# Verify that the deleted history entry is gone and the other one that matched
# the prefix search above is still there.
sendline(
    "echo count AGAIN (history search -e -C 'echo hello AGAIN' | wc -l | string trim)"
)
expect_prompt("count AGAIN 0\r\n")

sendline(
    "echo count again (history search -e -C 'echo hello again' | wc -l | string trim)"
)
expect_prompt("count again 1\r\n")

# Verify that the $history var has the expected content.
sendline("echo history2=$history\[2\]")
expect_prompt("history2=echo count AGAIN .*\r\n")

# Verify that history search is case-insensitive by default
sendline("echo term")
expect_prompt("term")
sendline("echo TERM")
expect_prompt("TERM")
sendline("echo banana")
expect_prompt("banana")
send("ter\x1b[A")  # up-arrow
expect_re("echo TERM")
sendline("")
expect_prompt("TERM")

# Check that leading space makes an ephemeral item
sendline(" echo ephemeral")
expect_prompt("ephemeral")
send("\x1b[A") # up-arrow
expect_re(" echo ephemeral")
sendline("")
expect_prompt("ephemeral")
sendline(" ")
expect_prompt()
send("\x1b[A")
expect_re("echo TERM") # not ephemeral!

# Verify that clear-session works as expected
# Note: This test depends on that history merge resets the session from history clear-sessions point of view.
sendline("builtin history clear")
expect_prompt()

# create before history
sendline("echo before1")
expect_prompt()
sendline("echo before2")
expect_prompt()
# "reset" session with history merge
sendline("history merge")
expect_prompt()
# create after history
sendline("echo after")
expect_prompt()
#clear session
sendline("history clear-session")
expect_prompt()
sendline("history search --exact 'echo after' | cat")
expect_prompt("\r\n")
