import os
import bpy
import json
from bpy.types import Operator
from bpy.props import StringProperty, IntProperty, BoolProperty
from .funcs import pref, has_templates, name_from_path, already_present, on_path_update
from .. import __package__ as base_package

class CT_OT_export_templates(Operator):
    bl_idname = "ct.export_templates"
    bl_label = "Export custom templates"
    bl_description = "Export the current list of templates to JSON file"

    filepath: StringProperty(
        subtype="FILE_PATH", description="Select the path for the exported file", default="templates.json")

    def execute(self, context):
        prefs = pref()
        with open(self.filepath, 'w') as f:
            projects = [{"name": project.name, "path": project.path}
                        for project in prefs.projects]
            json.dump(projects, f, indent=4)

        self.report({'INFO'}, f"Templates exported to {self.filepath}")
        return {'FINISHED'}

    def invoke(self, context, event):
        context.window_manager.fileselect_add(self)
        return {'RUNNING_MODAL'}

    @classmethod
    def poll(cls, context):
        return has_templates()

class CT_OT_import_templates(Operator):
    bl_idname = "ct.import_templates"
    bl_label = "Import custom templates"
    bl_description = "Import a list of templates from JSON file (note that this will override the current templates list)"

    filepath: StringProperty(
        subtype="FILE_PATH", description="Select the .json file to load")

    def execute(self, context):
        prefs = pref()

        if os.path.exists(self.filepath):
            with open(self.filepath, 'r') as f:
                projects = json.load(f)

            prefs.projects.clear()
            for project in projects:
                item = prefs.projects.add()
                item.name = project["name"]
                item.path = project["path"]
            prefs.active_template_index = 0
            context.preferences.is_dirty = True

            self.report({'INFO'}, f"Projects imported from {self.filepath}")
        else:
            self.report(
                {'WARNING'}, f"Import cancelled: path not found ({self.filepath})")
        return {'FINISHED'}

    def invoke(self, context, event):
        context.window_manager.fileselect_add(self)
        return {'RUNNING_MODAL'}

class CT_OT_add(Operator):
    bl_idname = "ct.add"
    bl_label = "Add Template"
    bl_description = "Add new template"

    def execute(self, context):
        prefs = pref()
        prefs.projects.add()
        prefs.active_template_index = len(prefs.projects) - 1
        context.preferences.is_dirty = True
        return {'FINISHED'}

class CT_OT_remove(Operator):
    bl_idname = "ct.remove"
    bl_label = "Remove Template"
    bl_description = "Remove selected template"

    def execute(self, context):
        prefs = pref()
        prefs.projects.remove(prefs.active_template_index)
        prefs.active_template_index = min(
            max(0, prefs.active_template_index - 1), len(prefs.projects) - 1)
        context.preferences.is_dirty = True
        return {'FINISHED'}

    @classmethod
    def poll(cls, context):
        return has_templates()

class CT_OT_move_up(Operator):
    bl_idname = "ct.move_up"
    bl_label = "Move Up"
    bl_description = "Move the selected template up in the list"

    def execute(self, context):
        prefs = pref()
        index = prefs.active_template_index

        if index > 0:
            prefs.projects.move(index, index - 1)
            prefs.active_template_index -= 1
            context.preferences.is_dirty = True
        else:
            self.report({'WARNING'}, "Template is already at the top")
        return {'FINISHED'}

    @classmethod
    def poll(cls, context):
        return has_templates()

class CT_OT_move_down(Operator):
    bl_idname = "ct.move_down"
    bl_label = "Move Down"
    bl_description = "Move the selected template down in the list"

    def execute(self, context):
        prefs = pref()
        index = prefs.active_template_index

        if index < len(prefs.projects) - 1:
            prefs.projects.move(index, index + 1)
            prefs.active_template_index += 1
            context.preferences.is_dirty = True
        else:
            self.report({'WARNING'}, "Template is already at the bottom")
        return {'FINISHED'}

    @classmethod
    def poll(cls, context):
        return has_templates()

class CT_OT_clear(Operator):
    bl_idname = "ct.clear"
    bl_label = "Clear Templates"
    bl_description = "Clear the current list of templates (remove all templates)"

    def execute(self, context):
        prefs = pref()
        prefs.projects.clear()
        prefs.active_template_index = 0
        context.preferences.is_dirty = True
        return {'FINISHED'}

    def invoke(self, context, event):
        return context.window_manager.invoke_props_dialog(self)

    @classmethod
    def poll(cls, context):
        return has_templates()

class CT_OT_add_template_popup(Operator):
    bl_idname = "ct.add_template_popup"
    bl_label = "Use as template"
    bl_description = "Use the current .blend file to create a new template occurency"

    name: StringProperty(name="Project Name")

    def execute(self, context):
        prefs = pref()
        if not already_present(self, prefs, bpy.data.filepath):
            if bpy.data.filepath:
                new_project = prefs.projects.add()
                new_project.name = self.name
                new_project.path = bpy.data.filepath
                self.name = ''
                context.preferences.is_dirty = True
            else:
                self.report({'ERROR'}, "Current file is not saved on disk.")
        return {'FINISHED'}

    def invoke(self, context, event):
        if bpy.data.filepath:
            self.name = name_from_path(bpy.data.filepath)
        return context.window_manager.invoke_props_dialog(self)

class CT_OT_select_template_popup(Operator):
    bl_idname = "ct.select_template_popup"
    bl_label = "Select a new custom template"
    bl_description = "Create a new template by selecting an existing .blend file"

    path: StringProperty(name="Template Path",
                         subtype="FILE_PATH", update=on_path_update)
    name: StringProperty(name="Template Name")

    def execute(self, context):
        prefs = pref()
        if not already_present(self, prefs, self.path):
            template = prefs.projects.add()
            template.name = self.name
            template.path = self.path
            context.preferences.is_dirty = True
            self.name = ''
            self.path = ''

        return {'FINISHED'}

    def invoke(self, context, event):
        return context.window_manager.invoke_props_dialog(self)

class CT_OT_add_templates_from_folder(Operator):
    bl_idname = "ct.add_templates_from_folder"
    bl_label = "Add Templates from Folder"
    bl_description = "Add templates from a specified folder containing .blend files"

    directory: StringProperty(
        subtype="DIR_PATH", description="Select the folder containing .blend files")
    depth: IntProperty(
        name="Depth", description="Depth of recursion (default 1)", default=1, min=1)

    def execute(self, context):
        prefs = pref()

        if os.path.exists(self.directory):
            blend_files = []
            for root, dirs, files in os.walk(self.directory):
                # Calculate the current depth
                current_depth = root[len(self.directory):].count(os.sep)
                if current_depth < self.depth:
                    for file in files:
                        if file.endswith('.blend'):
                            blend_files.append(os.path.join(root, file))

            if not blend_files:
                self.report(
                    {'WARNING'}, "No .blend files found in the specified directory")
                return {'CANCELLED'}
            new_t = 0
            for path in blend_files:
                if not already_present(self, prefs, path, False):
                    new_t += 1
                    item = prefs.projects.add()
                    item.name = name_from_path(path)
                    item.path = path

            context.preferences.is_dirty = True
            self.report(
                {'INFO'}, f"{new_t} new templates added from {self.directory} ({len(blend_files) - new_t} already present)")
        else:
            self.report(
                {'WARNING'}, f"Import cancelled: directory not found ({self.directory})")
        return {'FINISHED'}

    def invoke(self, context, event):
        context.window_manager.fileselect_add(self)
        return {'RUNNING_MODAL'}

class CT_OT_open_preferences(Operator):
    bl_idname = "ct.open_preferences"
    bl_label = "Open Custom Templates Preferences"
    bl_description = "Open the preferences for the Custom Templates add-on"

    def execute(self, context):
        bpy.ops.screen.userpref_show('INVOKE_DEFAULT')
        context.preferences.active_section = 'ADDONS'
        context.window_manager.addon_search = "Custom Templates"
        return {'FINISHED'}

class CT_OT_add_workspace(Operator):
    bl_idname = "ct.add_workspace"
    bl_label = "Add this workspace from your template"
    bl_description = "Add to the current project, the selected workspace from your Custom Template"

    workspace: StringProperty(name="workspace")
    path: StringProperty(name="path")

    def execute(self, context):
        bpy.ops.workspace.append_activate(idname=self.workspace, filepath=self.path)
        return {'FINISHED'}

class CT_OT_template_workspaces(Operator):
    bl_idname = "ct.template_workspaces"
    bl_label = "Add workspace from this template"
    bl_description = "Click to select one of the workspaces from this Custom Template"

    index: IntProperty(name='index', default=0)

    def draw_ws(self, s, context):
        layout = s.layout
        template = pref().projects[self.index]
        with bpy.data.libraries.load(template.path) as (data, _):
            for w in data.workspaces:
                op = layout.operator("ct.add_workspace", text=w)
                op.workspace = w
                op.path = template.path

    def execute(self, context):
        return {'RUNNING_MODAL'}

    def invoke(self, context, event):
        wm = context.window_manager
        template = pref().projects[self.index]
        wm.popup_menu(self.draw_ws, title=f"Workspaces from '{template.name}'", icon="ADD")
        return {'RUNNING_MODAL'}

class CT_OT_start_from(Operator):
    bl_idname = "ct.start_from"
    bl_label = "Start from..."
    bl_description = "Use any selected .blend file as template (and optionally add it to the list)"

    filepath: StringProperty(
        subtype="FILE_PATH", description="Select the .json file to load", update=on_path_update)
    add: BoolProperty(default=False, name="Add template", description="Add this file in your templates")
    name: StringProperty(name="Name", description="The name for this template (if empty, file name will be used)")

    def execute(self, context):
        prefs = pref()
        if self.filepath:
            if self.add and not already_present(self, prefs, self.filepath):
                template = prefs.projects.add()
                template.name = self.name if self.name else name_from_path(self.filepath)
                template.path = self.filepath
                context.preferences.is_dirty = True
                
            bpy.ops.wm.read_homefile(filepath=self.filepath)
        else:
            self.report({'WARNING'}, "This option can only be used from File > New menu")
        return {'FINISHED'}

    def invoke(self, context, event):
        context.window_manager.fileselect_add(self)
        return {'RUNNING_MODAL'}