import QtQuick
import Quickshell.Io
import qs.Commons
import qs.Ui
import "Modes.js" as Modes

// Bar slot for claude-mode: shows which provider the next `claude` launch will
// use, and opens a panel that switches it.
//
// State comes from ~/.claude-mode/health.json, which claude-mode rewrites on
// every switch and on every `status`. Watching that file rather than polling
// the CLI keeps this widget at zero cost while idle, and means a switch made
// in a terminal shows up here without anything having to tell us.
BarWidget {
  id: root
  moduleName: "smoido.claude-mode"

  readonly property string cmRoot: String(setting("root", Modes.defaultRoot()))
  // Off by default - the bar is scarce horizontal space and the mark already
  // says which provider is active. Turn it on per-instance in shell.json to get
  // the preset name back beside the icon.
  readonly property bool showLabel: setting("showLabel", false) === true

  // Whole health.json, or null before the first successful read.
  property var health: null
  // state.json is the narrower fallback: it exists from install onward, where
  // health.json only appears once claude-mode has run at least once. Without
  // this the widget would render "unknown" on a fresh install until the first
  // switch, which is precisely when someone is most likely to look at it.
  property var fallbackState: null

  readonly property string mode: {
    if (health && health.mode) return String(health.mode)
    if (fallbackState && fallbackState.mode) return String(fallbackState.mode)
    return ""
  }
  readonly property string preset: {
    if (mode === "anthropic") return ""
    if (health && health.preset) return String(health.preset)
    if (fallbackState && fallbackState.preset) return String(fallbackState.preset)
    return ""
  }
  readonly property bool known: mode !== ""

  // Measured against the neighbours: every stock bar glyph in this shell paints
  // 11px of ink from a 13px font. These marks fill their box rather than
  // carrying a font's internal padding, so the box itself has to be the smaller
  // number or the widget sits visibly larger than everything beside it.
  // Odd on purpose. The marks are radially symmetric, so their vertical and
  // horizontal arms sit on the centre line - which lands on a pixel *centre* at
  // an odd size and on the boundary between two pixels at an even one, where
  // each arm splits its coverage and comes out grey on both sides.
  readonly property int iconPx: {
    var n = Math.round(Number(root.setting("iconSize", Style.bar.iconFont)))
    return n % 2 === 0 ? n + 1 : n
  }
  readonly property string logo: Modes.logo(mode)
  readonly property string glyph: Modes.glyph(mode)
  readonly property string label: Modes.shortLabel(mode, preset)

  // A gateway mode is spending money or leaning on a local server; native
  // Anthropic is the resting state. Only the former earns the accent, so the
  // bar stays quiet exactly when nothing unusual is configured.
  readonly property bool gateway: known && mode !== "anthropic"

  readonly property color urgentColor: {
    var c = Color.urgent
    var mx = Math.max(c.r, c.g, c.b)
    var mn = Math.min(c.r, c.g, c.b)
    var l = (mx + mn) / 2
    var d = 1 - Math.abs(2 * l - 1)
    return (d > 0.0001 ? (mx - mn) / d : 0) >= 0.15 ? c : "#d2685f"
  }

  readonly property color activeColor: !known
    ? Color.muted
    : (gateway ? Color.accent : (bar ? bar.barForeground : Color.foreground))

  // The bar's shared tooltip only paints for a target that reports itself
  // hovered through this exact property.
  readonly property bool tooltipHovered: visible && opacity > 0 && hoverHandler.hovered

  function parseInto(prop, content) {
    try {
      var parsed = JSON.parse(String(content || ""))
      root[prop] = (parsed && typeof parsed === "object") ? parsed : null
    } catch (e) {
      root[prop] = null
    }
  }

  // `text()` is stale inside onFileChanged, so both first load and every later
  // change are routed through reload() -> onLoaded to always parse fresh bytes.
  FileView {
    id: healthFile
    path: root.cmRoot + "/health.json"
    watchChanges: true
    printErrors: false
    onFileChanged: reload()
    onLoaded: root.parseInto("health", text())
    onLoadFailed: root.health = null
  }

  FileView {
    id: stateFile
    path: root.cmRoot + "/state.json"
    watchChanges: true
    printErrors: false
    onFileChanged: reload()
    onLoaded: root.parseInto("fallbackState", text())
    onLoadFailed: root.fallbackState = null
  }

  // claude-mode writes health.json itself, so a switch launched from the panel
  // lands back here through the FileView above. This only covers the case
  // where the file was never written at all.
  Process {
    id: seedProc
    command: [root.cmRoot + "/bin/claude-mode", "health"]
    running: false
  }

  // ---- Broken transcripts
  //
  // A session cut short by a mode switch cannot be resumed, and nothing tells
  // you until you try - by which time you have usually forgotten which session
  // it was. So the bar checks periodically and marks itself when there is
  // something to fix.
  //
  // The scan reads the tail of each transcript first and only opens the whole
  // file when the tail already looks wrong, which is what makes it cheap enough
  // to sit on a timer: ~60ms for 59 transcripts here, against 5s for the naive
  // version that read every byte of every one.
  property var brokenSessions: []
  // Dismissed, or broken but untouched for longer than the age limit. Kept
  // out of the dot on purpose: hiding one is how you tell the bar to stop
  // asking about it.
  property var ignoredSessions: []
  property int ignoreAgeDays: 7
  property bool rescanPending: false

  Process {
    id: scanProc
    running: false
    command: [root.cmRoot + "/bin/claude-mode", "repair-session", "--json"]
    stdout: StdioCollector {
      waitForEnd: true
      onStreamFinished: {
        var d = null
        try { d = JSON.parse(String(text || "")) } catch (e) { d = null }
        root.brokenSessions = (d && d.broken) ? d.broken : []
        root.ignoredSessions = (d && d.ignored) ? d.ignored : []
        if (d && d.maxAgeDays !== undefined) root.ignoreAgeDays = Number(d.maxAgeDays)
      }
    }
    // A scan already under way was started before whatever asked for this
    // one, so its answer may predate the change - run once more after it.
    onExited: function (code) {
      if (root.rescanPending) {
        root.rescanPending = false
        Qt.callLater(root.scanSessions)
      }
    }
  }

  function scanSessions() {
    if (scanProc.running) root.rescanPending = true
    else scanProc.running = true
  }

  Timer {
    interval: 20 * 60 * 1000
    running: true
    repeat: true
    triggeredOnStart: true
    onTriggered: root.scanSessions()
  }

  function refresh() {
    healthFile.reload()
    stateFile.reload()
    if (!root.health) seedProc.running = true
    root.scanSessions()
  }

  Component.onCompleted: Qt.callLater(root.refresh)

  // ---- Bar content

  readonly property int gap: Style.space(5)

  readonly property real iconWidth: root.logo !== "" ? icon.implicitWidth : fallbackIcon.implicitWidth

  implicitWidth: vertical
    ? barSize
    : (iconWidth + (labelText.visible ? gap + labelText.implicitWidth : 0) + Style.space(10))
  implicitHeight: vertical ? (iconPx + Style.space(10)) : barSize

  Row {
    anchors.centerIn: parent
    spacing: root.gap

    Item {
      anchors.verticalCenter: parent.verticalCenter
      width: icon.width
      height: icon.height
      visible: root.logo !== ""

      BrandIcon {
        id: icon
        anchors.fill: parent
        pathData: root.logo
        opticalScale: Modes.logoScale(root.mode)
        color: root.activeColor
        iconSize: root.iconPx
      }

      // Recolouring the mark would misreport the mode, which is this widget's
      // whole job, so the warning gets its own dot instead.
      Rectangle {
        visible: root.brokenSessions.length > 0
        width: Math.max(4, Math.round(root.iconPx / 3.2))
        height: width
        radius: width / 2
        color: root.urgentColor
        anchors.right: parent.right
        anchors.top: parent.top
        anchors.rightMargin: -Math.round(width / 3)
        anchors.topMargin: -Math.round(width / 4)
      }
    }

    // Only reached when claude-mode is not installed - there is no brand to
    // draw for "no answer", so the pictograph stands in.
    Text {
      id: fallbackIcon
      anchors.verticalCenter: parent.verticalCenter
      visible: root.logo === ""
      text: root.glyph
      color: root.activeColor
      font.family: root.bar ? root.bar.fontFamily : Style.font.family
      font.pixelSize: Style.bar.iconFont
      renderType: Text.NativeRendering
    }

    Text {
      id: labelText
      anchors.verticalCenter: parent.verticalCenter
      visible: !root.vertical && root.showLabel && root.label !== ""
      text: root.label
      color: root.activeColor
      font.family: root.bar ? root.bar.fontFamily : Style.font.family
      font.pixelSize: Style.bar.iconFont - 1
      renderType: Text.NativeRendering
    }
  }

  // ---- Interaction

  // The bar decides a module is clickable - and gives it the pointing-hand
  // cursor - purely by whether it exposes triggerPress().
  function triggerPress(button) {
    if (root.bar) root.bar.hideTooltip(root)
    root.togglePanel()
  }

  function tooltipLabel() {
    if (!root.known) return "claude-mode: not installed"
    var lines = [Modes.title(root.mode)]
    if (root.preset !== "") lines.push("preset " + root.preset)
    var models = root.health && root.health.models ? root.health.models : null
    if (models && models.opus) lines.push("opus " + models.opus)
    if (models && models.sonnet) lines.push("sonnet " + models.sonnet)
    if (root.brokenSessions.length > 0) {
      lines.push(root.brokenSessions.length === 1
        ? "1 session needs repair"
        : root.brokenSessions.length + " sessions need repair")
    }
    return lines.join("  ·  ")
  }

  function syncTooltip() {
    if (!bar || !hoverHandler.hovered) return
    var text = tooltipLabel()
    if (bar.tooltipTarget === root) {
      if (bar.tooltipText !== text) bar.tooltipText = text
    } else {
      bar.showTooltip(root, text)
    }
  }

  onHealthChanged: syncTooltip()
  onBrokenSessionsChanged: syncTooltip()

  // Hover must come from a HoverHandler: once triggerPress() exists the bar's
  // own slot MouseArea accepts hover events and swallows them before any
  // MouseArea here would see them. The call is deferred one turn because
  // `hovered` flips before tooltipHovered has propagated, and showTooltip()
  // silently refuses a target that does not yet report itself hovered.
  HoverHandler {
    id: hoverHandler
    onHoveredChanged: {
      if (!root.bar) return
      if (hovered) Qt.callLater(root.syncTooltip)
      else root.bar.hideTooltip(root)
    }
  }

  MouseArea {
    anchors.fill: parent
    acceptedButtons: Qt.RightButton | Qt.MiddleButton
    onClicked: function(mouse) {
      if (mouse.button === Qt.MiddleButton) root.refresh()
      else if (panelLoader.item) panelLoader.item.switchTo("anthropic", "")
    }
  }

  // ---- Panel wiring

  function injectPanel() {
    var target = panelLoader.item
    if (!target) return
    if ("bar" in target) target.bar = root.bar
    if ("settings" in target) target.settings = root.settings
    if ("anchorItem" in target) target.anchorItem = root
    if ("hostWidget" in target) target.hostWidget = root
    if ("widget" in target) target.widget = root
  }

  function togglePanel() { if (panelLoader.item) panelLoader.item.toggle() }

  readonly property bool opened: panelLoader.item ? panelLoader.item.opened === true : false
  function open() { if (panelLoader.item) panelLoader.item.open() }
  function close() { if (panelLoader.item) panelLoader.item.close() }

  onBarChanged: injectPanel()
  onSettingsChanged: injectPanel()

  Loader {
    id: panelLoader
    active: true
    source: Qt.resolvedUrl("Panel.qml")
    visible: false
    onLoaded: {
      root.injectPanel()
      Qt.callLater(root.injectPanel)
    }
  }
}