# We need a JSON parser to effectively test the JSON produced by
# fossil. It looks like the one from tcllib is exactly what we need.
# On ActiveTcl, add it with teacup. On other platforms, YMMV.
# teacup install json
# teacup install json::write
package require json

proc json2dict {txt} {
  set rc [catch {::json::json2dict $txt} result options]
  if {$rc != 0} {
    protOut "JSON ERROR: $result" 
    return {}
  }
  return $result
}

# Make sure we have a build with the json command at all and that it
# is not stubbed out. This assumes the current (as of 2016-01-27)
# practice of eliminating all trace of the fossil json command when
# not configured. If that changes, these conditions might not prevent
# the rest of this file from running.
fossil help -a
if {[string first json $RESULT] < 0} {
  puts "Fossil was not compiled with JSON support (fossil help -a)."; return




}

# and that the json itself smells ok and has the expected API error code in it
fossil json -expectError 
set JR [json2dict $RESULT]
if {$JR eq ""} {
  puts "Fossil was not compiled with JSON support (bad JSON)."; return
}
test json-1 {[dict exists $JR resultCode]
             && [dict get $JR resultCode] eq "FOSSIL-4102"}

# Use the CLI interface to execute a JSON command. Sets the global
# RESULT to the response text, and JR to a Tcl dict conversion of the
# response body.
#
# Returns "200" or "500".
proc fossil_json {args} {
  global RESULT JR
  uplevel 1 fossil json {*}$args
  set JR [json2dict $RESULT]
  return "200"
}

# Use the HTTP interface to GET a JSON API URL. Sets the globals
# RESULT to the HTTP response body, and JR to a Tcl dict conversion of
# the response body.
# 
# Returns the status code from the HTTP header.
proc fossil_http_json {url {cookie "Muppet=Monster"} args} {
  global RESULT JR
  set request "GET $url HTTP/1.1\r\nHost: localhost\r\nUser-Agent: Fossil-http-json\r\nCookie: $cookie"
  set RESULT [fossil_maybe_answer $request http {*}$args]
  regexp {(?w)(.*)^\s*$(.*)} $RESULT dummy head body
  regexp {^HTTP\S+\s+(\d\d\d)\s+(.*)$} $head dummy status msg
  if {$status eq "200"} {
    set JR [json2dict $body]
  }
  return $status
}


# Use the HTTP interface to POST a JSON API URL. Sets the globals
# RESULT to the HTTP response body, and JR to a Tcl dict conversion of

  set RESULT [fossil_maybe_answer $request http {*}$args]

  # separate HTTP headers from body
  regexp {(?w)(.*)^\s*$(.*)} $RESULT dummy head body
  regexp {^HTTP\S+\s+(\d\d\d)\s+(.*)$} $head dummy status msg
  if {$status eq "200"} {
    if {[string length $body] > 0} {
      set JR [json2dict $body]
    } else {
      set JR ""
    }
  }
  return $status
}

fossil_json wiki diff $uuid1 $uuid2
test_json_envelope_ok json-wiki-diff-env
test_json_payload json-wiki-diff [list v1 v2 diff] {}
test json-wiki-diff-v1 {[dict get $JR payload v1] eq $uuid1}
test json-wiki-diff-v1 {[dict get $JR payload v2] eq $uuid2}
set diff [dict get $JR payload diff]
test json-wiki-diff-diff {[string first "+consectetur adipisicing elit" $diff] >= 0}
#puts [dict get $JR payload diff]

# wiki preview
#
# takes a string in fossil wiki markup and return an HTML fragment.
# This command does not make use of the actual wiki content (much?)
# at all.