from tab import StackTabber
from mode import Fundamental
from lex import Grammar, PatternRule, NocasePatternRule, RegionRule, NocaseRegionRule, OverridePatternRule
from mode.python import StringGrammar1, StringGrammar2

class BitStringGrammar(Grammar):
    rules = [PatternRule(r'data', r'[01]+')]

class HexStringGrammar(Grammar):
    rules = [NocasePatternRule(r'data', r'[0-9a-f]+')]

base_rules = [
    PatternRule(r'spaces', r' +'),
    OverridePatternRule(r'comment', r'--@@:(?P<token>[.a-zA-Z0-9_]+):(?P<mode>[.a-zA-Z0-9_]+) *$'),
    PatternRule(r'comment', r'--.*$'),
    RegionRule(r'comment', '/\*', Grammar, '\*/'),
    PatternRule(r'delimiter', r':=|[():;,\.\[\]~]'),
]

end_rules = [
    NocasePatternRule(r'sql_bareword', r'[a-z_][a-z0-9_]*'),
    PatternRule(r'eol', r'\n'),
]

class PlPgSqlGrammar1(Grammar): pass
class PlPgSqlGrammar2(Grammar): pass

sql_type_rule = NocasePatternRule(r'sql_type', r'(?:void|row|serial|varchar|float|integer|int|text|timestamptz|timestamp|datetz|date|timetz|time|boolean|bool)(?![A-Za-z0-9_])')

class FunctionGrammar(Grammar):
    rules = base_rules + [
        PatternRule(r'name', r'[a-zA-Z_][a-zA-Z0-9_]*(?=\()'),
        NocasePatternRule(r'keyword', r'(?:as|returns|language)'),
        sql_type_rule,
        NocasePatternRule(r'language', r'(?<=language ) *\'[a-zA-Z_][a-zA-Z0-9_]+\''),
        NocaseRegionRule(r'body', r"(?<=as )'", PlPgSqlGrammar1, "'(?!')"),
        NocaseRegionRule(r'body', r"(?<=as )(?P<delim>\$[^$]*\$)", PlPgSqlGrammar2, r"%(delim)s"),
        RegionRule(r'string', "'", StringGrammar1, "'"),
    ] + end_rules

function_rules = [
    NocaseRegionRule(r'function', r'create function', FunctionGrammar, r';'),
    NocaseRegionRule(r'function', r'create or replace function', FunctionGrammar, r';'),
]

sql_rules = [
    NocasePatternRule(r'attribute', r'(?:check|exists|unique|not null|default|primary key|minvalue|foreign key|references)(?![A-Za-z0-9_])'),
    NocasePatternRule(r'keyword', r'for update'),
    NocasePatternRule(r'sql_keyword', r'(?:while|for|if|loop|end loop|end if|case|when|then|else|not in|not|and|or|is not|is|in|between|overlaps|like|ilike|similar)(?![A-Za-z0-9_])'),
    NocasePatternRule(r'keyword', r'(?:alias for|set|return|declare|end|begin|commit|create database|create index|create sequence|create table|create trigger|create view|select into|select|insert into|insert|update|delete|drop database|drop index|drop sequence|drop table|drop trigger|drop view|create user|alter user|drop user|drop function|grant|revoke|create function|create or replace function|create or replace view|create language|create operator|create type)(?![A-Za-z0-9_])'),
    NocasePatternRule(r'builtin', r'(?:returns|language|right join|left join|inner join|outer join|join|where|unknown|null|true|false|into|values|as|from|order by|asc|desc|limit|distinct|cascade|using|on)(?![A-Za-z0-9_])'),
    sql_type_rule,
    PatternRule(r'sql_builtin', r'(?:nextval|current_timestamp|current_time|current_date)(?![A-Za-z0-9_])'),
    PatternRule(r'number', r'[0-9]+(?:e[+-]?[0-9]+)?'),
    PatternRule(r'number', r'[0-9]+\.(?:[0-9]+)?(?:e[+-]?[0-9]+)?'),
    PatternRule(r'number', r'\.[0-9]+(?:e[+-]?[0-9]+)'),
    RegionRule(r'sql_quoted', '"', StringGrammar2, '"'),
]

string_rules = [
    RegionRule(r'string', "B'", BitStringGrammar, "'"),
    RegionRule(r'string', "X'", HexStringGrammar, "'"),
    RegionRule(r'string', "'", StringGrammar1, "'"),
]

PlPgSqlGrammar1.rules = [
    PatternRule(r'variable', r'\$[0-9]+'),
] + base_rules + sql_rules + [
    RegionRule(r'string', "B''", BitStringGrammar, "''"),
    RegionRule(r'string', "X''", HexStringGrammar, "''"),
    RegionRule(r'string', "''", StringGrammar1, "''"),
] + end_rules

PlPgSqlGrammar2.rules = [
    PatternRule(r'variable', r'\$[0-9]+'),
] + base_rules + sql_rules + [
    RegionRule(r'string', "B'", BitStringGrammar, "'"),
    RegionRule(r'string', "X'", HexStringGrammar, "'"),
    RegionRule(r'string', "'", StringGrammar1, "'"),
] + end_rules

class SqlGrammar(Grammar):
    rules = base_rules + function_rules + sql_rules + string_rules + end_rules

class SqlTabber(StackTabber):
    wst  = ('spaces', 'null', 'eol', 'function.body.spaces', 'function.body.eol')
    st   = ('spaces', 'null', 'function.body.spaces')
    def is_base(self, y):
        if y == 0: return True
        highlighter = self.mode.window.buffer.highlights[self.mode.name]
        if not highlighter.tokens[y]: return False
        t = highlighter.tokens[y][0]
        return t.name == 'function'
    def _handle_other_token(self, currlvl, y, i):
        w      = self.mode.tabwidth
        token  = self.get_token(y, i)
        s      = token.string.lower()
        fqname = token.fqname()

        unhandled = False
        if token.name == 'delimiter' and s == ';':
            self._opt_pop('cont')
        elif token.name == 'eol':
            pass
        elif token.name == 'spaces':
            pass
        elif token.name == 'comment':
            pass
        elif fqname in ('function.body.start', 'function.body.end'):
            pass
        elif fqname in ('function.start', 'function.end'):
            pass
        elif token.name == 'sql_keyword':
            if s in ('then', 'loop'):
                pass
            elif s == 'if':
                self._append('if', currlvl + w)
            elif s == 'end if':
                self._opt_pop('if')
                currlvl = self.get_curr_level()
            elif s == 'end loop':
                self._opt_pop('loop')
                currlvl = self.get_curr_level()
            elif s == 'else':
                currlvl -= w
            elif s in ('while', 'for'):
                self._append('loop', currlvl + w)
            else:
                unhandled = True
        elif token.name == 'keyword':
            if s == 'declare':
                self._append('declare', currlvl + w)
            elif s == 'begin':
                currlvl -= w
            elif s == 'end':
                self._opt_pop('declare')
                currlvl = self.get_curr_level()
            else:
                unhandled = True
        else:
            unhandled = True

        if self.is_rightmost_token(y, i) and unhandled:
            self._opt_append('cont', currlvl + w)

        return currlvl

class Sql(Fundamental):
    name        = 'Sql'
    extensions  = ['.sql']
    grammar     = SqlGrammar
    tabbercls   = SqlTabber
    commentc    = '--'
    opentokens  = ('delimiter',)
    opentags    = {'(': ')', '[': ']', '{': '}'}
    closetokens = ('delimiter',)
    closetags   = {')': '(', ']': '[', '}': '{'}
    colors      = {
        'sql_keyword':      ('magenta', 'default', 'bold'),
        'attribute':        ('magenta', 'default', 'bold'),
        'sql_type':         ('green', 'default', 'bold'),
        'sql_builtin':      ('yellow', 'default', 'bold'),
        'sql_quoted.start': ('yellow', 'default', 'bold'),
        'sql_quoted.data':  ('yellow', 'default', 'bold'),
        'sql_quoted.null':  ('yellow', 'default', 'bold'),
        'sql_quoted.end':   ('yellow', 'default', 'bold'),
        'sql_variable':     ('yellow', 'default', 'bold'),
        'sql_bareword':     ('default', 'default'),

        'function.start':             ('cyan', 'default', 'bold'),
        'function.data':              ('default', 'default'),
        'function.null':              ('default', 'default'),
        'function.name':              ('default', 'default'),
        'function.body.start':        ('green', 'default', 'bold'),
        'function.body.sql_bareword': ('default', 'default'),
        'function.body.data':         ('default', 'default'),
        'function.body.null':         ('default', 'default'),
        'function.body.end':          ('green', 'default', 'bold'),
        'function.language':          ('green', 'default', 'bold'),
        'function.end':               ('default', 'default'),
    }
    _bindings = {
        'close-paren': (')',),
        'close-brace': ('}',),
        'close-bracket': (']',),
    }

install = Sql.install