"""Tests for shared.blocks — Block Kit builders."""

from freezegun import freeze_time

from shared.blocks import (
    build_admin_overview,
    build_help_blocks,
    build_holiday_add_modal,
    build_holiday_added_blocks,
    build_override_modal,
    build_pay_summary_blocks,
    build_pickup_request_blocks,
    build_pickup_resolved_blocks,
    build_roster_blocks,
    build_shift_change_message,
    build_swap_request_blocks,
    build_swap_resolved_blocks,
    build_week_schedule,
    markdown_to_mrkdwn,
)


def _all_action_ids(blocks):
    ids = []
    for b in blocks:
        if b.get("type") == "actions":
            ids.extend(e["action_id"] for e in b["elements"])
    return ids


class TestBuildWeekSchedule:
    @freeze_time("2026-06-01 12:00:00")  # Monday
    def test_header_and_section_present(self, schedule):
        blocks = build_week_schedule(schedule)
        assert blocks[0]["type"] == "header"
        assert "After-Hours Schedule" in blocks[0]["text"]["text"]
        assert blocks[1]["type"] == "section"

    @freeze_time("2026-06-01 12:00:00")
    def test_all_available_produces_pickup_buttons(self, schedule):
        # Empty schedule → every shift is available → pickup buttons exist,
        # including a weekend day button with the _day suffix.
        blocks = build_week_schedule(schedule)
        action_ids = _all_action_ids(blocks)
        assert "pickup_2026-06-03" in action_ids  # Wednesday night
        assert "pickup_2026-06-06_day" in action_ids  # Saturday day shift
        assert "pickup_2026-06-06" in action_ids  # Saturday night shift

    @freeze_time("2026-06-01 12:00:00")
    def test_assigned_shift_has_no_pickup_button(self, schedule, seed):
        seed.weekly("Wednesday", "114", "Alice")
        blocks = build_week_schedule(schedule)
        assert "pickup_2026-06-03" not in _all_action_ids(blocks)
        assert "Alice (Ext 114)" in blocks[1]["text"]["text"]

    @freeze_time("2026-06-01 12:00:00")
    def test_weekday_night_row_shows_glyph_without_time_label(self, schedule, seed):
        # Weekdays are night-only, so the moon glyph alone differentiates the row;
        # the verbose time-range label is reserved for weekends where both shifts
        # coexist (and would otherwise repeat on ~10 weekday rows).
        seed.weekly("Wednesday", "114", "Alice")
        text = build_week_schedule(schedule)[1]["text"]["text"]
        wednesday_line = next(
            line for line in text.splitlines() if "Alice (Ext 114)" in line
        )
        assert ":crescent_moon:" in wednesday_line
        assert "Night (5pm" not in wednesday_line

    @freeze_time("2026-06-01 12:00:00")
    def test_weekend_night_row_keeps_glyph_and_time_label(self, schedule, seed):
        # Weekends carry both shifts, so the night row keeps the full label.
        seed.weekly("Saturday", "200", "Alice")
        text = build_week_schedule(schedule)[1]["text"]["text"]
        saturday_line = next(
            line for line in text.splitlines() if "Alice (Ext 200)" in line
        )
        assert ":crescent_moon:" in saturday_line
        assert "Night (5pm" in saturday_line

    @freeze_time("2026-06-01 12:00:00")
    def test_weekend_day_row_shows_day_glyph_and_label(self, schedule, seed):
        seed.weekly("Saturday", "200", "Alice", shift_type="day")
        text = build_week_schedule(schedule)[1]["text"]["text"]
        assert ":sunny:" in text
        assert "Day (8am" in text

    @freeze_time("2026-06-01 12:00:00")
    def test_holiday_on_weekday_renders_badge_and_open_slots(self, schedule, seed):
        # A holiday can land on a weekday (here a Thursday) and shows the badge,
        # the multiplier, and a day-shift pickup button for its open slots.
        seed.holiday("2026-06-04", slots=2, label="Test Holiday")
        blocks = build_week_schedule(schedule)
        text = blocks[1]["text"]["text"]
        assert "Holiday" in text
        assert "Test Holiday" in text
        assert "1.5x" in text
        assert "2 open slots" in text
        assert "pickup_2026-06-04_day" in _all_action_ids(blocks)

    @freeze_time("2026-06-01 12:00:00")
    def test_holiday_lists_assignees_and_remaining_slots(self, schedule, seed):
        seed.holiday(
            "2026-06-04",
            slots=2,
            label="Test Holiday",
            assignees={"114": {"name": "Alice", "claimed_at": "x"}},
        )
        blocks = build_week_schedule(schedule)
        text = blocks[1]["text"]["text"]
        assert "Alice (Ext 114)" in text
        assert "1 open slot" in text  # one of two slots filled

    @freeze_time("2026-06-01 12:00:00")
    def test_full_holiday_has_no_pickup_button(self, schedule, seed):
        seed.holiday(
            "2026-06-04",
            slots=1,
            label="Test Holiday",
            assignees={"114": {"name": "Alice", "claimed_at": "x"}},
        )
        blocks = build_week_schedule(schedule)
        assert "pickup_2026-06-04_day" not in _all_action_ids(blocks)

    @freeze_time("2026-06-01 12:00:00")
    def test_holiday_pickup_button_label_says_holiday(self, schedule, seed):
        seed.holiday("2026-06-04", slots=2, label="Test Holiday")
        blocks = build_week_schedule(schedule)
        labels = [
            e["text"]["text"]
            for b in blocks
            if b.get("type") == "actions"
            for e in b["elements"]
        ]
        assert any("Holiday" in lbl for lbl in labels)


class TestBuildShiftChangeMessage:
    def test_picked_up_weekday(self):
        blocks = build_shift_change_message(
            "U1", "2026-06-03", "picked_up", "114", "Alice"
        )
        text = blocks[0]["text"]["text"]
        assert "<@U1>" in text and "picked up" in text and "Ext 114" in text
        # Weekday is night-only → the notification still labels the after-hours shift
        assert "Night (5pm" in text

    def test_dropped_shows_available(self):
        blocks = build_shift_change_message(
            "U1", "2026-06-03", "dropped", "114", "Alice"
        )
        assert "Available" in blocks[0]["text"]["text"]

    def test_swapped_text(self):
        blocks = build_shift_change_message("U2", "2026-06-03", "swapped", "115", "Bob")
        assert "swapped" in blocks[0]["text"]["text"]

    def test_weekend_includes_shift_label(self):
        blocks = build_shift_change_message(
            "U1", "2026-06-06", "picked_up", "200", "Alice", shift_type="day"
        )
        assert "Day (8am" in blocks[0]["text"]["text"]


class TestBuildPaySummaryBlocks:
    def test_renders_breakdown_and_totals(self):
        breakdown = [
            {
                "day": "Mon",
                "date_label": "Jun 1",
                "name": "Alice",
                "extension": "114",
                "rate": 50.0,
            }
        ]
        totals = {
            "Alice": {"shifts": 1, "total": 50.0, "extension": "114", "rate": 50.0}
        }
        blocks = build_pay_summary_blocks("Jun 1 to Jun 7", breakdown, totals)
        assert blocks[0]["type"] == "header"
        assert "Jun 1 to Jun 7" in blocks[0]["text"]["text"]
        text = blocks[1]["text"]["text"]
        assert "Alice" in text and "$50.00" in text and "1 shift" in text

    def test_holiday_row_shows_effective_rate_and_note(self):
        breakdown = [
            {
                "day": "Thu",
                "date_label": "Jul 4",
                "name": "Alice",
                "extension": "114",
                "rate": 75.0,  # effective (1.5x of 50)
                "is_holiday": True,
                "multiplier": 1.5,
            }
        ]
        totals = {
            "Alice": {
                "shifts": 1,
                "total": 75.0,
                "extension": "114",
                "rate": 50.0,
                "holiday_shifts": 1,
            }
        }
        blocks = build_pay_summary_blocks("Jun 29 to Jul 5", breakdown, totals)
        text = blocks[1]["text"]["text"]
        assert "$75.00" in text  # effective rate on the breakdown line
        assert "1.5x" in text
        assert "Holiday" in text
        assert "incl. 1 holiday" in text  # totals note

    def test_regular_row_has_no_holiday_decorations(self):
        breakdown = [
            {
                "day": "Mon",
                "date_label": "Jun 1",
                "name": "Alice",
                "extension": "114",
                "rate": 50.0,
            }
        ]
        totals = {
            "Alice": {"shifts": 1, "total": 50.0, "extension": "114", "rate": 50.0}
        }
        text = build_pay_summary_blocks("Jun 1 to Jun 7", breakdown, totals)[1]["text"][
            "text"
        ]
        assert "Holiday" not in text
        assert "incl." not in text


class TestBuildSwapRequestBlocks:
    def _action_ids(self, blocks):
        return [
            e["action_id"]
            for b in blocks
            if b["type"] == "actions"
            for e in b["elements"]
        ]

    def test_weekday_request_has_accept_decline(self):
        blocks = build_swap_request_blocks("U_REQ", "2026-06-03", "night")
        assert "<@U_REQ>" in blocks[0]["text"]["text"]
        ids = self._action_ids(blocks)
        assert ids == ["swap_accept_2026-06-03", "swap_decline_2026-06-03"]

    def test_weekend_day_request_uses_day_suffix_and_label(self):
        blocks = build_swap_request_blocks("U_REQ", "2026-06-06", "day")
        assert "Day (8am" in blocks[0]["text"]["text"]
        ids = self._action_ids(blocks)
        assert ids == ["swap_accept_2026-06-06_day", "swap_decline_2026-06-06_day"]

    def test_button_styles(self):
        elements = build_swap_request_blocks("U_REQ", "2026-06-03", "night")[1][
            "elements"
        ]
        assert elements[0]["style"] == "primary"  # Accept
        assert elements[1]["style"] == "danger"  # Decline


class TestBuildSwapResolvedBlocks:
    def test_renders_text_no_buttons(self):
        blocks = build_swap_resolved_blocks("All done.")
        assert blocks == [
            {"type": "section", "text": {"type": "mrkdwn", "text": "All done."}}
        ]


class TestBuildHolidayAddedBlocks:
    def test_header_context_and_section(self):
        blocks = build_holiday_added_blocks("2026-07-04", "Independence Day", 2, 1.5)
        assert blocks[0]["type"] == "header"
        assert "Independence Day" in blocks[0]["text"]["text"]
        assert blocks[1]["type"] == "context"
        section = blocks[-1]["text"]["text"]
        assert "2 slots" in section
        assert "1.5x" in section
        assert "Holiday" in section

    def test_single_slot_is_singular(self):
        section = build_holiday_added_blocks("2026-07-04", "Indep", 1, 2)[-1]["text"][
            "text"
        ]
        assert "1 slot" in section and "1 slots" not in section
        assert "2x" in section  # whole-number multiplier drops the .0

    def test_date_label_override(self):
        blocks = build_holiday_added_blocks(
            "2026-07-04", "Indep", 1, 1.5, date_label="July 4th"
        )
        assert blocks[1]["elements"][0]["text"] == "July 4th"


class TestBuildPickupRequestBlocks:
    def _action_ids(self, blocks):
        return [
            e["action_id"]
            for b in blocks
            if b["type"] == "actions"
            for e in b["elements"]
        ]

    def test_weekday_request_encodes_date_and_ext(self):
        blocks = build_pickup_request_blocks(
            "U_REQ", "Alice", "2026-06-03", "night", "114"
        )
        text = blocks[0]["text"]["text"]
        assert "<@U_REQ>" in text and "Ext 114" in text
        assert "already started" in text
        ids = self._action_ids(blocks)
        assert ids == ["pickup_approve_2026-06-03_114", "pickup_deny_2026-06-03_114"]

    def test_weekend_day_request_uses_day_suffix(self):
        blocks = build_pickup_request_blocks(
            "U_REQ", "Alice", "2026-06-06", "day", "114"
        )
        assert "Day (8am" in blocks[0]["text"]["text"]
        ids = self._action_ids(blocks)
        assert ids == [
            "pickup_approve_2026-06-06_day_114",
            "pickup_deny_2026-06-06_day_114",
        ]

    def test_holiday_request_shows_badge_and_day_suffix(self):
        blocks = build_pickup_request_blocks(
            "U_REQ", "Alice", "2026-07-04", "day", "114", is_holiday=True
        )
        assert "Holiday" in blocks[0]["text"]["text"]
        ids = self._action_ids(blocks)
        assert ids == [
            "pickup_approve_2026-07-04_day_114",
            "pickup_deny_2026-07-04_day_114",
        ]

    def test_button_styles(self):
        elements = build_pickup_request_blocks(
            "U_REQ", "Alice", "2026-06-03", "night", "114"
        )[1]["elements"]
        assert elements[0]["style"] == "primary"  # Approve
        assert elements[1]["style"] == "danger"  # Deny


class TestBuildPickupResolvedBlocks:
    def test_renders_text_no_buttons(self):
        blocks = build_pickup_resolved_blocks("Approved.")
        assert blocks == [
            {"type": "section", "text": {"type": "mrkdwn", "text": "Approved."}}
        ]


class TestBuildHelpBlocks:
    def test_non_admin_excludes_admin_section(self):
        text = build_help_blocks(is_admin=False)[0]["text"]["text"]
        assert "Admin Commands" not in text

    def test_admin_includes_admin_section(self):
        text = build_help_blocks(is_admin=True)[0]["text"]["text"]
        assert "Admin Commands" in text

    def test_admin_includes_holiday_commands(self):
        text = build_help_blocks(is_admin=True)[0]["text"]["text"]
        assert "holiday add" in text
        assert "holiday remove" in text
        assert "holiday list" in text

    def test_non_admin_excludes_holiday_commands(self):
        text = build_help_blocks(is_admin=False)[0]["text"]["text"]
        assert "holiday add" not in text


class TestBuildRosterBlocks:
    def test_empty_roster(self):
        text = build_roster_blocks([])[0]["text"]["text"]
        assert "No employees" in text

    def test_linked_and_unlinked(self):
        roster = [
            {"SK": "115", "name": "Bob", "slack_user_id": ""},
            {"SK": "114", "name": "Alice", "slack_user_id": "U_ALICE"},
        ]
        text = build_roster_blocks(roster)[0]["text"]["text"]
        # Sorted by extension → Alice (114) appears before Bob (115)
        assert text.index("Alice") < text.index("Bob")
        assert "<@U_ALICE>" in text
        assert "_not linked_" in text


def _block_ids(view):
    return {b["block_id"] for b in view["blocks"] if b.get("block_id")}


class TestBuildOverrideModal:
    def test_callback_and_input_blocks(self):
        view = build_override_modal([{"extension": "114", "name": "Alice"}])
        assert view["type"] == "modal"
        assert view["callback_id"] == "admin_override_submit"
        assert _block_ids(view) == {"date", "extension", "shift_type"}

    def test_extension_dropdown_built_from_roster(self):
        view = build_override_modal(
            [{"extension": "114", "name": "Alice"}, {"extension": "115", "name": "Bob"}]
        )
        ext_block = next(b for b in view["blocks"] if b["block_id"] == "extension")
        values = [o["value"] for o in ext_block["element"]["options"]]
        assert values == ["114", "115"]

    def test_empty_roster_omits_options(self):
        view = build_override_modal([])
        ext_block = next(b for b in view["blocks"] if b["block_id"] == "extension")
        assert "options" not in ext_block["element"]


class TestBuildHolidayAddModal:
    def test_callback_and_input_blocks(self):
        view = build_holiday_add_modal()
        assert view["callback_id"] == "admin_holiday_add_submit"
        assert _block_ids(view) == {"date", "slots", "multiplier", "label"}

    def test_multiplier_is_optional(self):
        view = build_holiday_add_modal()
        mult = next(b for b in view["blocks"] if b["block_id"] == "multiplier")
        assert mult["optional"] is True


class TestBuildAdminOverview:
    def test_empty_overview(self):
        text = build_admin_overview([], [])["text"]["text"]
        assert "Nothing scheduled" in text

    def test_lists_overrides_and_holidays(self):
        overrides = [
            {
                "date": "2026-12-25",
                "shift_type": "night",
                "extension": "114",
                "name": "Alice",
            },
            {
                "date": "2026-12-26",
                "shift_type": "day",
                "extension": "OPEN",
                "name": "Open",
            },
        ]
        holidays = [
            {
                "SK": "2026-12-25",
                "slots": 2,
                "assignees": {},
                "multiplier": 1.5,
                "label": "Christmas",
            }
        ]
        text = build_admin_overview(overrides, holidays)["text"]["text"]
        assert "Alice (Ext 114)" in text
        assert "(Day) — Open" in text
        assert "Christmas" in text
        assert "0/2 filled" in text


class TestMarkdownToMrkdwn:
    def test_markdown_bold_becomes_slack_bold(self):
        assert markdown_to_mrkdwn("**Big news.** text") == "*Big news.* text"

    def test_markdown_italic_becomes_underscore(self):
        # Single asterisks are italic in Markdown; Slack uses underscores.
        assert markdown_to_mrkdwn("a *note* here") == "a _note_ here"

    def test_bold_and_italic_together(self):
        out = markdown_to_mrkdwn("**Bold.** Then *(an aside)*")
        assert out == "*Bold.* Then _(an aside)_"

    def test_links_and_bullets(self):
        out = markdown_to_mrkdwn("- see [docs](http://x)\n- next")
        assert "•  see <http://x|docs>" in out
        assert "•  next" in out

    def test_adversarial_input_runs_in_linear_time(self):
        # py/polynomial-redos regression: possessive quantifiers must keep these
        # patterns from catastrophic backtracking. Pathological inputs that would
        # hang a backtracking engine complete effectively instantly here.
        import time

        for evil in ("*" + "*a" * 4000, "[" + "[\\(" * 4000, "[" + "](" * 4000):
            start = time.perf_counter()
            markdown_to_mrkdwn(evil)
            assert time.perf_counter() - start < 1.0